Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device, and relates to the technical field of batteries. The battery device comprises a battery cell assembly and a box body, wherein the battery cell assembly comprises a plurality of battery cells; the case has an accommodation space that accommodates the battery cell assembly. The box body comprises a first wall and a second wall, the first wall and the second wall are oppositely arranged along a first direction, in the first direction, the first wall is positioned at the top of the battery monomer assembly, and the second wall is positioned at the bottom of the battery monomer assembly; wherein the battery monomers are connected to the first wall, the first wall is provided with a heat insulation structure, and the heat insulation structure is located on one side, deviating from the second wall, of the battery monomer assembly. In the battery device provided by the embodiment of the invention, the heat insulation structure can block heat transfer of the external environment or other wall parts of the box body, so that the battery monomers are located in a more suitable temperature environment provided by the internal environment of the box body, the damage to the battery monomers is further reduced, and the reliability of the battery device is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, the reliability of battery devices is an issue that cannot be ignored. If the reliability of a battery device is poor, it will be difficult for the battery device to be popularized. Therefore, how to improve the reliability of battery devices is a technical issue in battery technology that needs to be considered for a long time. Utility Model Content

[0004] The present application provides a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery device, including a battery cell assembly and a box, wherein the battery cell assembly includes a plurality of battery cells. The box has a storage space, and the storage space stores the battery cell assembly. The box includes a first wall and a second wall, wherein the first wall and the second wall are arranged opposite to each other along a first direction, wherein the first wall is located at the top of the battery cell assembly and the second wall is located at the bottom of the battery cell assembly along the first direction; wherein the battery cell is connected to the first wall, and the first wall is provided with a heat insulation structure, and the heat insulation structure is located on the side of the battery cell assembly away from the second wall.

[0007] In the above embodiment, the battery cell is connected to the first wall located at the top, which can achieve the purpose of reducing safety hazards and improving the reliability of the battery device, and a heat insulation structure is arranged on the first wall to which the battery cell is connected, and the heat insulation structure is located on the side of the battery cell assembly away from the second wall, so that the heat insulation structure can block the heat transfer from the external environment or other walls of the box, thereby reducing the impact of the external environment temperature or the temperature of other walls of the box on the battery cell, so that the battery cell is in a more suitable temperature environment provided by the internal environment of the box, thereby reducing damage to the battery cell and improving the reliability of the battery device.

[0008] In some embodiments, the insulating structure includes an insulating cavity disposed within the first wall.

[0009] In the above embodiment, the insulation cavity inside the first wall can reduce the solid thermal conductivity of the first wall, making it difficult for the external environment or other walls of the box to transfer heat through the insulation cavity, thereby reducing the impact on the battery cells connected to the first wall.

[0010] In some embodiments, the first wall includes a first plate and a second plate. Along the first direction, the first plate is located between the battery cell assembly and the second plate. The battery cell is connected to the first plate. An insulation cavity is formed between the first plate and the second plate.

[0011] In the above embodiment, along the first direction, at least partial areas of the first plate body and the second plate body are spaced apart to form a first wall, and the spacing space between the first plate body and the second plate body forms an insulating cavity, which is used to make it difficult for heat from the external environment or other walls of the box body to be transferred to the first plate body located on the inner side. Because the battery cell is connected to the first plate body, the battery cell connected to the first plate body can be less affected.

[0012] In some embodiments, along the first direction, a protrusion is provided on a side of the second plate body facing the first plate body, and the protrusion is connected to the first plate body.

[0013] In the above embodiment, by providing a protrusion on the second plate body and connecting it to the first plate body through the protrusion, the protrusion provided on the second plate body can be closer to the first plate body than other areas without the protrusion. On this basis, the first plate body and the second plate body are connected by connecting the first plate body through the protrusion, so that other areas of the second plate body without the protrusion are spaced larger from the first plate body, thereby improving the thermal insulation performance. At the same time, by providing the protrusion to shorten the distance between the connection area of ​​the first plate body and the second plate body, the connection process of the second plate body and the first plate body can be more selective and more operable.

[0014] In some embodiments, the protrusion is connected to the first plate by welding. With this arrangement, the protrusion is connected to the first plate by welding, which can improve the connection performance between the first plate and the second plate.

[0015] In some embodiments, the protrusion extends along the second direction, the second direction is perpendicular to the first direction, the protrusion is welded to the first plate to form a plurality of welding portions, and the plurality of welding portions are arranged at intervals along the second direction. With this arrangement, the protrusion is welded to the first plate to form a plurality of welding portions, so that a spacing space can be formed between adjacent welding portions, thereby enabling the heat insulation cavity between the first plate and the second plate to have a larger area, thereby improving the heat insulation performance of the heat insulation cavity.

[0016] In some embodiments, there are multiple heat-insulating cavities, and the protrusion separates two adjacent heat-insulating cavities. With this configuration, the protrusion is configured as a convex strip, and the convex strip is connected to the first plate body, so as to separate the heat-insulating cavity as a whole into two heat-insulating cavities located on opposite sides of the convex strip. In this configuration, the connection area between the protrusion of the second plate body and the first plate body is larger, which can effectively improve the connection strength between the first plate body and the second plate body, thereby improving the reliability of the box body as a whole.

[0017] In some embodiments, along the first direction, a concave portion is provided at a position corresponding to the protrusion on a side of the second plate body away from the first plate body. Through this arrangement, the protrusion on the second plate body can be integrally formed, thereby making the preparation of the second plate body simpler and more efficient. Exemplarily, the second plate body can be formed by integral stamping to obtain the protrusion.

[0018] In some embodiments, the second plate is provided with reinforcing ribs. By providing reinforcing ribs on the second plate located outside, the strength of the second plate can be improved, and the impact of the external environment on the box body, such as the impact caused by splashing of foreign objects and collisions, can be reduced.

[0019] In some embodiments, the thickness of the second plate body is 0.7 mm-1.2 mm. This configuration can improve the strength of the second plate body while taking into account the manufacturing cost.

[0020] In some embodiments, the thermal insulation structure includes a thermal insulation layer disposed on a surface of the first wall.

[0021] In the above embodiment, by providing a thermal insulation layer on the surface of the first wall, the thermal insulation layer can block the heat transfer from the external environment or other walls of the box, thereby improving the thermal insulation performance of the first wall to reduce the impact of the external environment or other walls of the box on the battery cells connected to the first wall.

[0022] In some embodiments, along the first direction, the first wall has a first surface facing away from the battery cell assembly, and the heat insulation layer is disposed on the first surface. By this arrangement, the heat insulation layer is disposed on the first surface facing away from the battery cell, which can reduce the effect of the heat insulation layer on the connectivity between the battery cell and the box body. It can also enable the manufacturing process of the heat insulation layer to be placed after the battery cell assembly is boxed, thereby improving the flexibility of the manufacturing process.

[0023] In some embodiments, the heat insulating layer is a heat insulating coating disposed on the surface of the first wall. The spraying process has the advantages of simple preparation and high preparation efficiency. By using the spraying material to obtain the heat insulating layer, the final battery device can be more economical.

[0024] In some embodiments, the material of the thermal insulation coating is polyurethane, silicate, rock wool spray or inorganic thermal insulation mortar. Through this setting, the above materials have the advantages of being easier to obtain and more economical as thermal insulation coatings.

[0025] In some embodiments, there is a gap between the battery cell assembly and the second wall. This arrangement can reduce solid heat transfer between the battery cell and the second wall, thereby making the battery cell less affected by the external environment or the second wall, further improving the reliability of the battery cell.

[0026] In some embodiments, the box body further includes a side wall, which is arranged around the first wall and the second wall, and the side wall, the first wall and the second wall jointly define a storage space, and there is a gap between the battery cell assembly and the side wall. Through this arrangement, the battery cell is only connected to the first wall, and the first wall provided with the heat insulation structure can better block the heat transfer from the external environment or other wall parts to the battery cell, thereby improving the reliability of the battery cell.

[0027] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device provided by any embodiment of the first aspect.

[0028] In some embodiments, the electrical device is a vehicle, the vehicle includes a passenger cabin, and a cabin wall of the passenger cabin includes a first wall.

[0029] In the above embodiment, because the cabin wall serving as the passenger compartment includes a first wall having a heat-insulating structure, the battery cells are connected to the first wall, which makes it difficult for the heat generated by the external environment and the vehicle itself to be transferred to the battery cells, thereby improving the reliability of the battery device, and further enabling the vehicle including the battery device to have higher reliability.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0033] Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application;

[0034] Figure 3 A schematic diagram of the connection structure between a battery cell and a busbar provided in some embodiments of the present application;

[0035] Figure 4 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0036] Figure 5 A schematic diagram of the structure of a battery device provided in some embodiments of the present application;

[0037] Figure 6 A schematic diagram of the structure of a battery device provided for some embodiments of the present application (showing a heat-insulating cavity);

[0038] Figure 7 A schematic diagram of the structure of a first wall provided in some embodiments of the present application;

[0039] Figure 8 A schematic diagram of the structure of a battery device provided for some embodiments of the present application (showing a heat insulation layer);

[0040] Fig. 9 A schematic diagram of the structure of an electrical device provided in some embodiments of the present application.

[0041] icon:

[0042] 1000-vehicle; 100-battery device; 200-controller; 300-motor; 10-housing; 11-first housing; 12-second housing; 20-battery cell; 201-electrode terminal; 202-housing; 2021-shell; 2022-end cover; 203-electrode assembly; 30-bus; 400-battery cell assembly; 101-accommodating space; 102-first wall; 1021-insulating structure; 10211-insulating cavity; 10212-insulating layer; 1022-first plate; 1023-second plate; 10231-protrusion; 102311-welding portion; 10232-reinforcing rib; 1024-first surface; 103-second wall; 104-side wall; 105-gap; 1001-passenger compartment; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0045] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment 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 is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0049] The term “plurality” used in this application refers to two or more (including two).

[0050] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0051] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0052] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery cell, such as a hexagonal battery cell.

[0053] The battery apparatus 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, in parallel or in mixed connection through a busbar.

[0054] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; 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.

[0055] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0056] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0057] 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.

[0058] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0059] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0060] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0061] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0062] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0063] In battery technology, battery cells are placed upside down in a box, which can not only reduce the potential safety hazards of the battery device, improve the reliability of the battery device, but also improve the space utilization of the battery device. For example, when the battery cell is placed upside down, the pressure relief valve is placed on the side of the battery cell facing downward. When the battery cell has thermal runaway, the high-temperature and high-pressure gas will be discharged downward through the pressure relief valve, which can reduce the impact on the external environment.

[0064] When the battery cell is invertedly arranged in the box, in order to improve the connection stability of the battery cell, the battery cell can be connected to the top wall of the box. This arrangement will form solid heat transfer between the battery cell and the box, making it easier for the external temperature to affect the battery cell, thereby reducing the reliability of the battery cell.

[0065] In view of this, an embodiment of the present application provides a battery device, including a battery cell assembly and a box, wherein the battery cell assembly includes a plurality of battery cells. The box has a storage space, and the storage space stores the battery cell assembly. The box includes a first wall and a second wall, wherein the first wall and the second wall are arranged opposite to each other along a first direction, wherein the first wall is located at the top of the battery cell assembly and the second wall is located at the bottom of the battery cell assembly along the first direction; wherein the battery cell is connected to the first wall, and the first wall is provided with a heat insulation structure, and the heat insulation structure is located on the side of the battery cell assembly away from the second wall.

[0066] In such a battery device, the battery cells are connected to the first wall located at the top, which can achieve the purpose of reducing safety hazards and improving the reliability of the battery device, and a heat insulation structure is arranged on the first wall to which the battery cells are connected, and the heat insulation structure is located on the side of the battery cell assembly away from the second wall, so that the heat insulation structure can block the heat transfer from the external environment or other walls of the box, thereby reducing the impact of the external environment temperature or the temperature of other walls of the box on the battery cells, so that the battery cells are in a more suitable temperature environment provided by the internal environment of the box, thereby reducing damage to the battery cells and improving the reliability of the battery device.

[0067] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, 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.

[0068] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0069] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery device 100 inside, 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 be used as an operating power source of the vehicle 1000.

[0070] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0071] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0072] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of a battery device 100 according to some embodiments of the present application. The battery device 100 may include a battery cell 20 and a box 10 . The box 10 is used to accommodate the battery cell 20 .

[0073] Among them, a closed space for accommodating the battery cell 20 is formed inside the box 10, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first box 11 and a second box 12, and the first box 11 and the second box 12 are buckled with each other. The first box 11 and the second box 12 can be in various shapes, such as a cuboid, a cylinder, etc. The first box 11 can be a hollow structure with one side open, and the second box 12 can also be a hollow structure with one side open. The open side of the second box 12 is buckled with the open side of the first box 11 to form a box 10 with a closed space. It is also possible that the first box 11 is a hollow structure with one side open, and the second box 12 is a plate-like structure. The second box 12 is buckled on the open side of the first box 11, so as to form a box 10 with a accommodating space 101.

[0074] In the battery device 100, there may be one or more battery cells 20. If there are more than one battery cell 20, the battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 20 are connected in series and in parallel. A battery module may be formed by connecting a plurality of battery cells 20 in series, in parallel, or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole and accommodated in the box 10. Alternatively, all the battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all the battery cells 20 is accommodated in the box 10.

[0075] In some embodiments, please refer to Figure 3 , Figure 3 The schematic diagram of the connection structure between the battery cell 20 and the busbar 30 of some embodiments of the present application, the battery device 100 may further include a busbar 30, and multiple battery cells 20 may be electrically connected through the busbar 30 to achieve series connection, parallel connection or mixed connection of multiple battery cells 20. The busbar 30 may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0076] In some embodiments, please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a battery cell 20 in some embodiments of the present application. The battery cell 20 may include a housing 202 and an electrode assembly 203 , wherein the electrode assembly 203 is accommodated in the housing 202 .

[0077] In some embodiments, the housing 202 may include a shell 2021 and an end cap 2022, wherein the shell 2021 has an opening, and the end cap 2022 closes the opening of the shell 2021. The closing here means covering or closing, which may be sealed or unsealed.

[0078] The shell 2021 is a component for accommodating the electrode assembly 203. The shell 2021 may be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at opposite ends. The shell 2021 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The material of the shell 2021 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The electrode assembly 203 may be partially located in the shell 2021, or may be completely located in the shell 2021.

[0079] The end cap 2022 and the shell 2021 together define a receiving space for accommodating the electrode assembly 203 and other components. The end cap 2022 can be connected to the shell 2021 by welding, crimping, etc. to close the opening of the shell 2021. The shape of the end cap 2022 can be adapted to the shape of the shell 2021. For example, the shell 2021 is a rectangular parallelepiped structure, and the end cap 2022 is a rectangular plate structure adapted to the shell 2021. For another example, the shell 2021 is a cylindrical structure, and the end cap 2022 is a circular plate structure adapted to the shell 2021. The material of the end cap 2022 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 2022 and the shell 2021 can be the same or different.

[0080] In the embodiment where the housing 2021 is opened at one end, one end cap 2022 may be provided. In the embodiment where the housing 2021 is opened at two opposite ends, two end caps 2022 may be provided, and the two end caps 2022 respectively close the two openings of the housing 2021, and the two end caps 2022 and the housing 2021 together define a receiving space.

[0081] In some embodiments, the battery cell 20 may further include an electrode terminal 201, which is disposed on the housing 202, and is used to electrically connect to the tab of the electrode assembly 203 to input or output the electrical energy of the battery cell 20. The electrode terminal 201 may be disposed on the shell 2021 of the housing 202, or on the end cover 2022 of the housing 202. Electrode terminals 201 of different polarities of a battery cell 20 may be disposed on the same side of the housing 202, or on different sides of the housing 202. The electrode terminal 201 and the tab may be directly connected, for example, the electrode terminal 201 and the tab are welded. The electrode terminal 201 and the tab may also be indirectly connected, for example, the electrode terminal 201 and the tab are indirectly connected through a current collecting member. The current collecting member may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0082] As an example, in Figure 4 In the illustrated embodiment, an opening is formed at one end of the shell 2021, and there is one end cap 2022 in the shell 202, and one end cap 2022 closes one opening of the shell 2021. Two electrode terminals 201 are provided on the end cap 2022, and the two electrode terminals 201 are respectively a positive electrode terminal 201 and a negative electrode terminal 201. A positive electrode tab and a negative electrode tab are formed at one end of the electrode assembly 203 facing the end cap 2022, and the positive electrode terminal 201 is electrically connected to the positive electrode tab, and the negative electrode terminal 201 is electrically connected to the negative electrode tab.

[0083] See also Figure 5 , Figure 5A schematic diagram of the structure of a battery device 100 provided in some embodiments of the present application. The embodiment of the present application provides a battery device 100, including a battery cell assembly 400 and a box 10, wherein the battery cell assembly 400 includes a plurality of battery cells 20. The box 10 has a receiving space 101, and the receiving space 101 receives the battery cell assembly 400. The box 10 includes a first wall 102 and a second wall 103, wherein the first wall 102 and the second wall 103 are arranged opposite to each other along a first direction X, wherein the first wall 102 is located at the top of the battery cell assembly 400, and the second wall 103 is located at the bottom of the battery cell assembly 400; wherein the battery cell 20 is connected to the first wall 102, and the first wall 102 is provided with a heat insulation structure 1021, and the heat insulation structure 1021 is located on the side of the battery cell assembly 400 away from the second wall 103.

[0084] The first wall 102 and the second wall 103 may be two parts with relative positions after integral molding. For example, the box body 10 may be integrally molded to obtain the first wall 102 and the second wall 103, and then the battery cell assembly 400 is placed through the side opening. The first wall 102 and the second wall 103 may also be two independent wall parts arranged in a split manner. For example, in the example where the box body 10 includes the first box body 11 and the second box body 12, the first wall 102 may be arranged on the first box body 11, and the second wall 103 may be arranged on the second box body 12, and the battery cell 20 is connected to the first box body 11.

[0085] The first wall 102 is located at the top of the battery cell assembly 400, and the second wall 103 is located at the bottom of the battery cell assembly 400, which refers to the relative position relationship of different wall parts when the battery device 100 is in use. The first wall 102 is the top wall of the box body 10, and the second wall 103 is the bottom wall of the box body 10. The first direction X can be parallel to the gravity direction.

[0086] The battery cell 20 may be connected to other walls of the box body 10 except the first wall 102 , or may not be connected to other walls except the first wall 102 .

[0087] The heat insulation structure 1021 can be used to block heat radiation from the external environment, or heat transferred from other components of the electrical device. The heat insulation structure 1021 can also be used to block the heat transfer of heat from other walls of the box body 10. Taking the heat transfer of external heat as an example, the temperature of the external environment can be lower than the temperature of the battery cell 20, and the external environment has a tendency to reduce the temperature of the battery cell 20; the temperature of the external environment can also be higher than the temperature of the battery cell 20, and the external environment has a tendency to increase the temperature of the battery cell 20. When the battery cell 20 is connected to the first wall 102 provided with the heat insulation structure 1021, the heat insulation structure 1021 can block the tendency of the battery cell 20 temperature to drop or rise.

[0088] In the above embodiment, the battery cell 20 is connected to the first wall 102 located at the top, which can achieve the purpose of reducing safety hazards and improving the reliability of the battery device 100, and a heat insulation structure 1021 is arranged on the first wall 102 connected to the battery cell 20, and the heat insulation structure 1021 is located on the side of the battery cell assembly 400 away from the second wall 103, so that the heat insulation structure 1021 can block the heat transfer from the external environment or other walls of the box body 10, thereby reducing the impact of the external environment temperature or the temperature of other walls of the box body 10 on the battery cell 20, so that the battery cell 20 is in a more suitable temperature environment provided by the internal environment of the box body 10, thereby reducing damage to the battery cell 20 and improving the reliability of the battery device 100.

[0089] In some embodiments, see Figure 6 , Figure 6 A schematic diagram of the structure of a battery device 100 provided in some embodiments of the present application (showing a heat-insulating cavity 10211 ). The heat-insulating structure 1021 includes a heat-insulating cavity 10211 disposed inside the first wall 102 .

[0090] The heat insulating cavity 10211 can be formed by arranging grooves inward on the surface of the plate body. When the heat insulating cavity 10211 is formed by arranging grooves, a groove with a bottom can be provided as the heat insulating cavity 10211, or a through groove can be used as the heat insulating cavity 10211. The heat insulating cavity 10211 can also be formed by arranging multiple layers of plates and providing spacing spaces between the multiple layers of plates. The first wall 102 having the heat insulating cavity 10211 inside can also be manufactured by a specific manufacturing process, such as extrusion molding.

[0091] In the above embodiment, the insulation cavity 10211 inside the first wall 102 can reduce the solid thermal conductivity of the first wall 102, making it difficult for the external environment or other walls of the box 10 to transfer heat through the insulation cavity 10211, thereby reducing the impact on the battery cell 20 connected to the first wall 102.

[0092] In some embodiments, still refer to Figure 6 The first wall 102 includes a first plate 1022 and a second plate 1023. Along the first direction X, the first plate 1022 is located between the battery cell assembly 400 and the second plate 1023. The battery cell 20 is connected to the first plate 1022. An insulating cavity 10211 is formed between the first plate 1022 and the second plate 1023.

[0093] There is a spacing space between the first plate 1022 and the second plate 1023, and the spacing space serves as an insulating cavity 10211 for heat insulation, and the spacing space includes the areas where the maximum distance and the minimum distance between the first plate 1022 and the second plate 1023 are located. The first plate 1022 and the second plate 1023 can be connected to each other. In this case, the first plate 1022 and the second plate 1023 can be connected through multiple connection points on the basis of the spacing setting, and other areas except the connection points can form a spacing space. In the area of ​​the connection point, the connection between the first plate 1022 and the second plate 1023 can be achieved through other connecting parts, and the first plate 1022 and / or the second plate 1023 can also be partially deformed to form a convex portion facing the second plate 1023 / the first plate 1022, and the connection between the first plate 1022 and the second plate 1023 is achieved through the convex portion.

[0094] The first plate 1022 and the second plate 1023 may be completely spaced apart, that is, there is no direct connection between the first plate 1022 and the second plate 1023. For the convenience of further description, taking the case 10 including the side wall 104 as an example, the side wall 104 of the case 10 is arranged around the first wall 102. The first plate 1022 and the second plate 1023 may be connected to the side wall 104 of the case 10 respectively to achieve relative fixation of the first plate 1022 and the second plate 1023, thereby obtaining a heat insulation cavity 10211 between the first plate 1022 and the second plate 1023.

[0095] In the above embodiment, along the first direction X, at least partial areas of the first plate 1022 and the second plate 1023 are spaced apart to form a first wall 102, and the spacing space between the first plate 1022 and the second plate 1023 forms an insulating cavity 10211, which is used to make it difficult for heat from the external environment or other walls of the box body 10 to be transferred to the first plate body 1022 located on the inner side. Because the battery cell 20 is connected to the first plate body 1022, the battery cell 20 connected to the first plate body 1022 can be less affected.

[0096] In some embodiments, still refer to Figure 6 , along the first direction X, a protrusion 10231 is provided on a side of the second plate body 1023 facing the first plate body 1022 , and the protrusion 10231 is connected to the first plate body 1022 .

[0097] The second plate 1023 has a protruding portion 10231 on one side facing the first plate 1022 . The side of the second plate 1023 facing away from the first plate 1022 may be in a flat plate shape or in a concave shape facing the first plate 1022 .

[0098] The protrusion 10231 may be a convex point or a convex strip, and may include one or more protrusions. The protrusion 10231 may be connected to the first plate 1022 as a whole, such as by bonding. Alternatively, part of the protrusion 10231 may be connected to the first plate 1022, such as by bolting, welding, etc.

[0099] In the above embodiment, by providing a protrusion 10231 on the second plate body 1023 and connecting it to the first plate body 1022 through the protrusion 10231, the protrusion 10231 provided on the second plate body 1023 can be closer to the first plate body 1022 than other areas where the protrusion 10231 is not provided. On this basis, the first plate body 1022 and the second plate body 1023 are connected by connecting the first plate body 1022 through the protrusion 10231, so that other areas of the second plate body 1023 where the protrusion 10231 is not provided have a larger distance from the first plate body 1022, which can improve the thermal insulation performance; at the same time, by providing the protrusion 10231 to shorten the distance between the connection area of ​​the first plate body 1022 and the second plate body 1023, the connection process of the second plate body 1023 and the first plate body 1022 can be more selective and more operable.

[0100] In some embodiments, the protrusion 10231 is connected to the first plate body 1022 by welding.

[0101] It can be that a plurality of welding points are formed after welding, and each welding point serves as a welding portion 102311. It can also be that a whole welding area is formed after welding.

[0102] In the above embodiment, the protrusion 10231 is welded to the first plate 1022 , which can improve the connection performance between the first plate 1022 and the second plate 1023 .

[0103] In some embodiments, still refer to Figure 6 , and see further Figure 7 , Figure 7 A schematic diagram of the structure of the first wall 102 provided in some embodiments of the present application. The protrusion 10231 extends along the second direction Y, the second direction Y is perpendicular to the first direction X, the protrusion 10231 is welded with the first plate 1022 to form a plurality of welding portions 102311, and the plurality of welding portions 102311 are arranged at intervals along the second direction Y. Through this arrangement, the protrusion 10231 is welded with the first plate 1022 to form a plurality of welding portions 102311, so that a spacing space can be formed between adjacent welding portions 102311, thereby enabling the heat insulation cavity 10211 between the first plate 1022 and the second plate 1023 to have a larger area, thereby improving the heat insulation performance of the heat insulation cavity 10211.

[0104] In some embodiments, still refer to Figure 6 , there are multiple heat-insulating cavities 10211, and the protrusion 10231 separates two adjacent heat-insulating cavities 10211. Through this configuration, the protrusion 10231 is configured as a convex strip, and the convex strip is connected to the first plate body 1022, so as to separate the heat-insulating cavity 10211 as a whole into two heat-insulating cavities 10211 located on opposite sides of the convex strip. In this configuration, the connection area between the protrusion 10231 of the second plate body 1023 and the first plate body 1022 is larger, which can effectively improve the connection strength between the first plate body 1022 and the second plate body 1023, thereby improving the overall reliability of the box body 10.

[0105] In some embodiments, still refer to Figure 6 , a concave portion is provided at a position corresponding to the protrusion 10231 on the side of the second plate 1023 facing away from the first plate 1022. Through this arrangement, the protrusion 10231 on the second plate 1023 can be integrally formed, thereby making the preparation of the second plate 1023 simpler and more efficient. Exemplarily, the second plate 1023 can be integrally stamped to obtain the protrusion 10231.

[0106] In some embodiments, still refer to Figure 6 and Figure 7 The second plate body 1023 is provided with reinforcing ribs 10232 .

[0107] The reinforcing rib 10232 may be extended along the second direction Y, or may be extended along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. One or more reinforcing ribs 10232 may be provided. The reinforcing rib 10232 may be in a shape where the second plate 1023 protrudes toward the first plate 1022, or may be in a shape where the second plate 1023 protrudes away from the first plate 1022. When the reinforcing rib 10232 is prepared in a protruding shape, the second plate 1023 may be provided with a recess at a position corresponding to the protrusion, so that the reinforcing rib 10232 is an integrally formed structure, and the preparation of the reinforcing rib 10232 can be facilitated by the integrally formed process.

[0108] In the above embodiment, by providing reinforcing ribs 10232 on the second plate 1023 located on the outside, the strength of the second plate 1023 can be improved, and the impact of the external environment on the box 10, such as the impact caused by splashing foreign objects and collisions, can be reduced.

[0109] In some embodiments, the thickness of the second plate 1023 is 0.7 mm-1.2 mm. This configuration can improve the strength of the second plate 1023 while taking into account the manufacturing cost.

[0110] In some embodiments, see Figure 8 , Figure 8 A schematic diagram of the structure of a battery device 100 provided in some embodiments of the present application (showing a heat insulation layer 10212 ). The heat insulation structure 1021 includes a heat insulation layer 10212 disposed on a surface of the first wall 102 .

[0111] The heat insulating layer 10212 may be disposed on the side of the first wall 102 facing the battery cell assembly 400, or on the side of the first wall 102 facing away from the battery cell assembly 400, or on both the side of the first wall 102 facing the battery cell assembly 400 and the side facing away from the battery cell assembly 400. The heat insulating layer 10212 may cover the entire first wall 102, or may only cover a partial area of ​​the surface of the first wall 102.

[0112] The heat-insulating layer 10212 may be a heat-insulating coating sprayed on the surface of the first wall 102 , or may be a heat-insulating material layer connected to the surface of the first wall 102 .

[0113] When the heat insulating layer 10212 is provided, the battery cell 20 may be connected to the heat insulating layer 10212 or may not be connected to the heat insulating layer 10212 .

[0114] It should be noted that, in the embodiment where the thermal insulation structure 1021 includes the thermal insulation layer 10212 , the thermal insulation structure 1021 may further include a thermal insulation cavity 10211 .

[0115] In the above embodiment, by setting an insulation layer 10212 on the surface of the first wall 102, the insulation layer 10212 can block the heat transfer from the external environment or other walls of the box body 10, thereby improving the insulation performance of the first wall 102, so as to reduce the impact of the external environment or other walls of the box body 10 on the battery cells 20 connected to the first wall 102.

[0116] In some embodiments, still refer to Figure 8 Along the first direction X, the first wall 102 has a first surface 1024 facing away from the battery cell assembly 400 , and the thermal insulation layer 10212 is disposed on the first surface 1024 .

[0117] The partially provided heat insulating layer 10212 may affect the connection stability of the battery cell 20. Through the provision of this embodiment, the heat insulating layer 10212 is provided on the first surface 1024 away from the battery cell 20, which can reduce the effect of the provision of the heat insulating layer 10212 on the connection between the battery cell 20 and the box body 10. In addition, the manufacturing process of providing the heat insulating layer 10212 can be placed after the battery cell assembly 400 is boxed, thereby improving the flexibility of the manufacturing process.

[0118] In some embodiments, the heat insulating layer 10212 is a heat insulating coating disposed on the surface of the first wall 102. In some examples, the heat insulating coating may be pre-sprayed on the side of the first wall 102 close to the battery cell assembly 400 to assemble the battery cell assembly 400. The heat insulating coating may also be sprayed on the side of the first wall 102 away from the battery cell 20. The spraying process may be performed before or after the battery cell assembly 400 is assembled. With this arrangement, the spraying process has the advantages of simple preparation and high preparation efficiency. By using the spraying material to obtain the heat insulating layer 10212, the final battery device 100 can be more economical.

[0119] In some embodiments, the material of the thermal insulation coating may be polyurethane, silicate, rock wool spray or inorganic thermal insulation mortar. In other embodiments, the material of the thermal insulation coating may also be a combination of polyurethane, silicate, rock wool spray or inorganic thermal insulation mortar. Through this arrangement, the above materials as thermal insulation coatings have the advantages of being easier to obtain and more economical.

[0120] In some embodiments, the battery cell assembly 400 has a gap 105 with the second wall 103. This arrangement can reduce solid heat transfer between the battery cell 20 and the second wall 103, thereby making the battery cell 20 less affected by the external environment or the second wall 103, further improving the reliability of the battery cell 20.

[0121] In some embodiments, the box body 10 further includes a side wall 104, which is arranged around the first wall 102 and the second wall 103. The side wall 104, the first wall 102 and the second wall 103 together define the accommodation space 101, and there is a gap 105 between the battery cell assembly 400 and the side wall 104. Through this arrangement, the battery cell 20 is only connected to the first wall 102, and the first wall 102 provided with the heat insulation structure 1021 can better block the heat transfer from the external environment or other walls to the battery cell 20, thereby improving the reliability of the battery cell 20.

[0122] See also Fig. 9 , Fig. 9 A schematic diagram of the structure of an electric device provided in some embodiments of the present application. In an embodiment where the electric device is a vehicle 1000, the vehicle 1000 may include a battery device 100 provided in any of the above embodiments. Further, the vehicle 1000 includes a passenger compartment 1001, and the compartment wall of the passenger compartment 1001 includes a first wall 102.

[0123] The first wall 102 is located on the top of the battery cell assembly 400 . The first wall 102 may serve as the floor of the passenger compartment 1001 , or may serve as a part of the floor of the passenger compartment 1001 .

[0124] In the above embodiment, because the bulkhead serving as the passenger compartment 1001 includes the first wall 102, the first wall 102 has a heat insulation structure 1021, and the battery cell 20 is connected to the first wall 102, it is possible to prevent the heat generated by the external environment and the vehicle 1000 itself from being transferred to the battery cell 20, thereby improving the reliability of the battery device 100, and thereby enabling the vehicle 1000 including the battery device 100 to have higher reliability.

[0125] In some embodiments of the present application, a battery device 100 is provided, including a battery cell assembly 400 and a box 10, wherein the battery cell assembly 400 includes a plurality of battery cells 20. The box 10 includes a first wall 102, a second wall 103, and a side wall 104, wherein the side wall 104 is disposed around the first wall 102 and the second wall 103, and the first wall 102, the second wall 103, and the side wall 104 jointly define a receiving space 101, wherein the receiving space 101 receives the battery cell assembly 400. The first wall 102 and the second wall 103 are disposed opposite to each other along a first direction X, wherein the first wall 102 is located at the top of the battery cell assembly 400, and the second wall 103 is located at the bottom of the battery cell assembly 400, wherein the battery cell 20 is connected to the first wall 102, and the first wall 102 is provided with a heat insulation structure 1021, wherein the heat insulation structure 1021 is located at a side of the battery cell assembly 400 away from the second wall 103. There is a gap 105 between the battery cell assembly 400 and both the second wall 103 and the side wall 104 .

[0126] Among them, the insulation structure 1021 may include a plurality of insulation cavities 10211 arranged inside the first wall 102, the first wall 102 includes a first plate body 1022 and a second plate body 1023, along the first direction X, the first plate body 1022 is located between the battery cell assembly 400 and the second plate body 1023, the battery cell 20 is connected to the first plate body 1022, and a plurality of insulation cavities 10211 are formed between the first plate body 1022 and the second plate body 1023. Along the first direction X, a protrusion 10231 is provided on one side of the second plate 1023 facing the first plate 1022, and a recess is provided on the second plate 1023 at a position corresponding to the protrusion 10231, the protrusion 10231 extends along the second direction Y, the protrusion 10231 separates two adjacent heat insulation cavities 10211, the second direction Y is perpendicular to the first direction X, the protrusion 10231 is welded to the first plate 1022, and a plurality of welding portions 102311 are formed, and the plurality of welding portions 102311 are arranged at intervals along the second direction Y. A reinforcing rib 10232 is also provided on the second plate 1023, and the thickness of the second plate 1023 is 0.7 mm-1.2 mm.

[0127] The heat insulation structure 1021 may also include a heat insulation layer 10212 disposed on the first surface 1024. Along the first direction X, the first wall 102 has a first surface 1024 away from the battery cell assembly 400. The heat insulation layer 10212 is a heat insulation coating disposed on the first surface 1024. The material of the heat insulation coating may be polyurethane, silicate, rock wool spray or inorganic thermal insulation mortar.

[0128] In some embodiments of the present application, an electrical device is further provided. The electrical device is a vehicle 1000 . The vehicle 1000 includes a passenger cabin 1001 . The cabin wall of the passenger cabin 1001 includes a first wall 102 .

[0129] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0130] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells; A box body having a containing space, wherein the containing space contains the battery monomer assembly; The box body comprises a first wall and a second wall, the first wall and the second wall are arranged opposite to each other along a first direction, along the first direction, the first wall is located at the top of the battery monomer assembly, and the second wall is located at the bottom of the battery monomer assembly; The battery cell is connected to the first wall, the first wall is provided with a heat insulation structure, and the heat insulation structure is located on a side of the battery cell assembly away from the second wall.

2. The battery device according to claim 1, characterized in that: The thermal insulation structure includes a thermal insulation cavity disposed inside the first wall.

3. The battery device according to claim 2, characterized in that: The first wall includes a first plate and a second plate. Along the first direction, the first plate is located between the battery cell assembly and the second plate. The battery cell is connected to the first plate. The heat insulation cavity is formed between the first plate and the second plate.

4. The battery device according to claim 3, characterized in that: Along the first direction, a protrusion is provided on a side of the second plate body facing the first plate body, and the protrusion is connected to the first plate body.

5. The battery device according to claim 4, characterized in that: The protruding portion is connected to the first plate by welding.

6. The battery device according to claim 4, characterized in that: The protruding portion extends along a second direction, the second direction is perpendicular to the first direction, the protruding portion is welded to the first plate body to form a plurality of welding portions, and the plurality of welding portions are arranged at intervals along the second direction.

7. The battery device according to claim 4, characterized in that: There are multiple heat-insulating cavities, and the protrusion separates two adjacent heat-insulating cavities.

8. The battery device according to claim 4, characterized in that: Along the first direction, a concave portion is provided at a position corresponding to the protruding portion on a side of the second plate body facing away from the first plate body.

9. The battery device according to claim 3, characterized in that: The second plate body is provided with reinforcing ribs.

10. The battery device according to claim 3, characterized in that: The thickness of the second plate is 0.7 mm-1.2 mm.

11. The battery device according to claim 1, characterized in that: The thermal insulation structure includes a thermal insulation layer disposed on a surface of the first wall.

12. The battery device according to claim 11, characterized in that: Along the first direction, the first wall has a first surface facing away from the battery cell assembly, and the heat insulation layer is disposed on the first surface.

13. The battery device according to claim 11, characterized in that: The heat insulation layer is a heat insulation coating disposed on the surface of the first wall.

14. The battery device according to claim 13, characterized in that: The material of the thermal insulation coating is polyurethane, silicate, rock wool spray or inorganic thermal insulation mortar.

15. The battery device according to any one of claims 1 to 14, characterized in that: A gap is defined between the battery cell assembly and the second wall.

16. The battery device according to any one of claims 1 to 14, characterized in that: The box body further includes a side wall, which is disposed around the first wall and the second wall. The side wall, the first wall and the second wall together define the accommodation space, and a gap exists between the battery cell assembly and the side wall.

17. An electrical device, characterized in that: A battery device comprising any one of claims 1-16.

18. The electrical device according to claim 17, characterized in that: The electrical device is a vehicle, the vehicle includes a passenger cabin, and a cabin wall of the passenger cabin includes the first wall.

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