Battery device and electric equipment

Abstract

The invention relates to a battery device and electric equipment. The battery device comprises a box body and a plurality of single batteries, the box body comprises a box body and a bottom plate assembly, a containing cavity is formed in the box body, an opening is formed in at least one end of the box body in the first direction, the bottom plate assembly is arranged in the opening in one end of the box body in the first direction, and the single batteries are arranged in the containing cavity; the bottom plate assembly comprises a first plate body and a second plate body which are oppositely arranged in the first direction, the second plate body is arranged on the side, facing the battery monomers, of the first plate body, and a buffer cavity is formed between the second plate body and the first plate body; at least one of the first plate body and the second plate body is provided with a convex rib protruding towards the other one, the extending direction of at least part of the assembling gaps is the same as the extending direction of part of the convex rib, and orthographic projections of the assembling gaps and the convex ribs in the same extending direction in the first direction have an overlapping area.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device and an electrical equipment. Background Art

[0002] The battery device is an important power source for electric vehicles. During the driving process of electric vehicles, the bottom of the battery device will be impacted by the flying of road stones, gravel, etc., resulting in the deformation of the bottom of the battery device and squeezing the battery cells inside the battery device, and then causing the deformation and damage of the battery cells, and even causing a fire. Summary of the Invention

[0003] In view of the defects existing in the prior art, the purpose of this application is to provide a battery device and an electrical equipment, which can effectively solve the problem that the battery cells are squeezed and deformed due to the impact on the bottom of the battery device.

[0004] In a first aspect, this application provides a battery device, which includes: A box body, which includes a box main body and a bottom plate assembly. An accommodation cavity is formed inside the box main body, and at least one end of the box main body in the first direction is provided with an opening. The bottom plate assembly is arranged at the opening at one end of the box main body in the first direction; A plurality of battery cells, which are arranged inside the accommodation cavity, and an assembly gap is formed between adjacent two battery cells; Wherein, the bottom plate assembly includes a first plate body and a second plate body that are oppositely arranged in the first direction. The second plate body is arranged on the side of the first plate body facing the battery cells, and a buffer cavity is formed between the second plate body and the first plate body. At least one of the first plate body and the second plate body is provided with a rib protruding towards the other. At least part of the extending direction of the assembly gap is the same as the extending direction of part of the ribs, and along the first direction, the overlapping area exists between the assembly gap with the same extending direction and the orthographic projection of the ribs.

[0005] According to the battery device of this application, by arranging a buffer cavity between the first plate body and the second plate body, when the first plate body is impacted and deformed, the buffer cavity can reduce the impact on the second plate body caused by the deformed first plate body, thereby reducing the impact on the battery cells. At the same time, by providing a rib protruding from at least one of the first plate body and the second plate body towards the other, and at least part of the extending direction of the assembly gap is the same as the extending direction of part of the ribs, and the overlapping area exists between the assembly gap with the same extending direction and the orthographic projection of the ribs along the first direction. When the first plate body is impacted and deformed, the impact force generated by the first plate body can be transmitted to the side walls of the shells of the battery cells on both sides of the assembly gap through the ribs, thereby reducing the impact force directly acting on the surface of the battery cells in the first direction, and further reducing the deformation and damage of the battery cells under the action of the impact force.

[0006] In some embodiments of the present application, along the first direction, the orthographic projection of at least a partial number of assembly gaps is completely within the range of the orthographic projection of the partial rib.

[0007] By completely setting the orthographic projection of the assembly gap within the range of the orthographic projection of the partial rib, that is, the side walls of the housings of the battery cells on both sides of the assembly gap are completely within the range of the orthographic projection of the partial rib along the first direction, thereby improving the range and effect of the impact force transmitted to the side walls of the housings of the battery cells on both sides of the assembly gap, and reducing the deformation and damage of the battery cells.

[0008] In some embodiments of the present application, the assembly gap includes a first assembly gap. At least a partial number of battery cells are arranged along the second direction. A first assembly gap is formed between two adjacent battery cells along the second direction. The first assembly gap extends along the third direction. The rib includes a first protruding portion extending along the third direction. Along the first direction, the orthographic projection of the first assembly gap and the orthographic projection of the first protruding portion have an overlapping area, where the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0009] By extending the first assembly gap and the first protruding portion along the third direction respectively, and making the orthographic projection of the first assembly gap and the orthographic projection of the first protruding portion have an overlapping area, when the first plate body is impacted and deformed, the impact force generated by the first plate body can be transmitted to the side walls of the housings of the battery cells on both sides of the first assembly gap through the first protruding portion, thereby reducing the deformation and damage of the battery cells.

[0010] In some embodiments of the present application, along the first direction, the orthographic projection of the first assembly gap is completely within the range of the orthographic projection of the first protruding portion.

[0011] By completely setting the orthographic projection of the first assembly gap within the range of the orthographic projection of the first protruding portion, that is, the side walls of the housings of the battery cells on both sides of the first assembly gap are completely within the range of the orthographic projection of the first protruding portion along the first direction, thereby improving the range and effect of the impact force transmitted to the side walls of the housings of the battery cells on both sides of the first assembly gap, and reducing the deformation and damage of the battery cells.

[0012] In some embodiments of the present application, the assembly gap further includes a second assembly gap. The battery device includes a plurality of battery cell assemblies. The plurality of battery cell assemblies are arranged along the third direction. Any one battery cell assembly includes a partial number of battery cells arranged along the second direction. A second assembly gap is formed between adjacent battery cell assemblies. The second assembly gap extends along the second direction. The rib further includes a second protruding portion extending along the second direction. Along the first direction, the orthographic projection of the second assembly gap and the orthographic projection of the second protruding portion have an overlapping area.

[0013] By extending the second assembly gap and the second protrusion along the second direction respectively, and making the orthographic projection of the second assembly gap and the orthographic projection of the second protrusion have an overlapping area, when the first plate is impacted and deformed, the impact force generated by the first plate can be transmitted to the side walls of the battery cells on both sides of the second assembly gap through the second protrusion, thereby reducing the deformation and damage of the battery cells. Moreover, by simultaneously arranging the first protrusion and the second protrusion, and setting the extending directions of the first protrusion and the second protrusion to intersect and form a grid-like structure, when an impact occurs at a certain position of the grid-like structure, it can be transmitted to other ribs nearby through the grid-like structure, and transmitted to the side walls of the battery cells on both sides of the assembly gap arranged correspondingly along the first direction through the ribs, thereby dispersing the impact force and reducing the deformation and damage of the battery cells.

[0014] In some embodiments of the present application, along the first direction, the orthographic projection of the second assembly gap is completely within the range of the orthographic projection of the second protrusion.

[0015] By completely arranging the orthographic projection of the second assembly gap within the range of the orthographic projection of the second protrusion, that is, the projections of the side walls of the battery cells on both sides of the second assembly gap along the first direction are completely within the range of the orthographic projection of the second protrusion, thereby improving the range and effect of the impact force transmitted to the side walls of the battery cells on both sides of the second assembly gap, and reducing the deformation and damage of the battery cells.

[0016] In some embodiments of the present application, the battery cell includes a first surface with the largest area, and the first surface is perpendicular to the second direction.

[0017] By setting the first surface perpendicular to the second direction, the impact force acting on the first surface along the direction perpendicular to the first surface can be reduced, thereby reducing the extrusion deformation of the first surface under the action of the impact force, and further reducing the deformation and damage of the battery cell.

[0018] In some embodiments of the present application, the first plate is connected to the box body and is used to seal one end opening of the box body, and the second plate is arranged inside the accommodation cavity.

[0019] By arranging the second plate inside the accommodation cavity, a lining plate structure is formed, thereby reducing the size of the battery cell along the first direction.

[0020] In some embodiments of the present application, the second plate includes a heat exchange plate, and the heat exchange plate is configured to perform heat exchange with the battery cell.

[0021] By setting the second plate as a heat exchange plate, the heat exchange plate can perform heat exchange with the battery cell, thereby adjusting the temperature of the battery cell, and further improving the performance of the battery device.

[0022] In some embodiments of the present application, the second plate body is provided with through holes for the circulation of electrophoresis solution, and the through holes are communicated with the buffer cavity.

[0023] By providing through holes on the second plate body that are communicated with the buffer cavity, the electrophoresis solution can flow into or out of the buffer cavity through the through holes, so as to perform electrophoresis on the inner wall surface of the buffer cavity, and form an electrophoresis protective layer on the surface of the first plate body facing the second plate body and the surface of the second plate body facing the first plate body, thereby improving the corrosion resistance of the bottom plate assembly.

[0024] In some embodiments of the present application, an insulating member is provided on one side of the battery cell facing the bottom plate assembly along the first direction. The insulating member is clamped between the battery cell and the second plate body and covers the through holes.

[0025] By clamping the insulating member between the battery cell and the second plate body and covering the through holes, it is possible to reduce the particles in the box from falling into the buffer cavity through the through holes, thereby reducing the noise generated by the particles hitting the inner wall surface of the buffer cavity.

[0026] In some embodiments of the present application, the second plate body is connected to the box body and is used to block one end opening of the box body. The first plate body is arranged outside the accommodating cavity.

[0027] By arranging the first plate body outside the accommodating cavity, an outer protection plate structure is formed, thereby increasing the size of the accommodating cavity along the first direction, increasing the size of the battery cell, and further increasing the power of the battery device.

[0028] In some embodiments of the present application, the rib includes a first rib. The first plate body protrudes from the side facing the second plate body and is provided with a first rib. The extending directions of at least some of the assembly gaps are the same as the extending directions of at least some of the first ribs, and there is an overlapping area in the orthographic projection along the first direction.

[0029] By providing the first rib on the first plate body, when the first plate body is impacted and deformed, the impact force generated by the first plate body can be transmitted to the side walls of the housing of the battery cells on both sides of at least some of the assembly gaps through at least some of the first ribs, thereby reducing the deformation and damage of the battery cells.

[0030] In some embodiments of the present application, the rib includes a first rib and a second rib. The first plate body protrudes from the side facing the second plate body and is provided with a first rib. The second plate body protrudes from the side facing the first plate body and is provided with a second rib. The extending directions of at least some of the assembly gaps, at least some of the first ribs, and at least some of the second ribs are the same, and there is an overlapping area in the orthographic projection along the first direction.

[0031] By providing a first rib on the first plate body and a second rib on the second plate body, when the first plate body is impacted and deformed, the impact force generated by the first plate body can be transmitted to the side walls of the battery cells on both sides of the assembly gap through at least part of the first rib and at least part of the second rib in sequence, thereby reducing the deformation and damage of the battery cells.

[0032] In some embodiments of the present application, a recessed portion is formed by recessing a part of the second plate body towards the first plate body, and the recessed portion is adhesively connected to the first plate body.

[0033] By forming a recessed portion by recessing a part of the second plate body towards the first plate body and adhesively connecting the recessed portion to the first plate body, the connection strength between the first plate body and the second plate body can be improved. At the same time, by recessing the connection portion between the second plate body and the first plate body, the contact between the connection portion and the battery cell can be reduced, and the deformation and damage of the battery cell caused by the extrusion of the connection portion under the action of the impact force can be reduced.

[0034] In some embodiments of the present application, the bottom plate assembly further includes a buffer member, and the buffer member is disposed on the side of the recessed portion facing the battery cell.

[0035] By providing a buffer member on the side of the recessed portion facing the battery cell, the buffer member can reduce the impact force of the second plate body on the battery cell, thereby reducing the deformation and damage of the battery cell.

[0036] In some embodiments of the present application, the end surface of the rib along the first direction is an arc surface.

[0037] By setting the end surface of the rib along the first direction as an arc surface, the stress concentration caused by the extrusion of the rib under the action of the impact force can be reduced, thereby reducing the deformation and cracking of the rib.

[0038] In a second aspect, the present application provides an electrical device, and the electrical device includes the battery device of any one of the above.

[0039] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application; Figure 2 It is a schematic structural diagram of a battery device provided by an embodiment of the present application; Figure 3 It is a schematic structural diagram of a battery cell assembly provided by an embodiment of the present application; Figure 4 It is an exploded structural diagram of a battery cell provided by an embodiment of the present application; Figure 5 It is a schematic bottom structure diagram of a battery device provided by an embodiment of the present application; Figure 6 It is Figure 5 an exploded structural diagram of the battery device in Figure 7 It is Figure 5 a schematic A-A sectional structure diagram of the battery device in Figure 8 It is Figure 7 an enlarged structural diagram of part B in Figure 9 It is Figure 5 a schematic internal structure diagram of the box in Figure 10 It is Figure 9 a schematic relative position structure diagram of the box and the insulating part in Figure 11 It is Figure 10 an enlarged structural diagram of part C in Figure 12 It is an exploded structural diagram of a battery device according to another embodiment of the present application; Figure 13 It is an exploded structural diagram of a battery device according to another embodiment of the present application; Figure 14 It is an exploded structural diagram of a battery device according to another embodiment of the present application; Figure 15 It is a schematic bottom structure diagram of a battery device according to another embodiment of the present application; Figure 16 It is Figure 15 a schematic D-D sectional structure diagram of the battery device in Figure 17 It is Figure 16 an enlarged structural diagram of part E in

[0041] The reference numerals in the specific embodiments are as follows: 1. Vehicle; 10. Battery device; 11. Controller; 12. Motor; 20. Battery cell assembly; 21. Battery cell; 211. End cap; 212. Housing; 2121. First surface; 213. Electrode assembly; 214. Electrode terminal; 22. First assembly gap; 30. Box body; 301. First part; 302. Second part; 31. Box main body; 32. Bottom plate assembly; 321. First plate body; 3211. First rib; 3212. First protrusion; 3213. Second protrusion; 322. Second plate body; 3221. Second rib; 3222. Through hole; 3223. Depression; 3224. Buffer member; 323. Buffer cavity; 40. Insulating member; X. First direction; Y. Second direction; Z. Third direction. Detailed implementation manners

[0042] The implementation manners of the technical solution of the present application will be described in detail below with reference to the drawings. The following implementation manners are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0043] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the implementation manners of the present application should be the ordinary meanings understood by those skilled in the art to which the implementation manners of the present application belong.

[0044] In the description of the implementation manners of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the implementation manners of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the implementation manners of the present application.

[0045] In addition, the technical terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the implementation manners of the present application, "a plurality of" means including two or more, unless otherwise specifically defined.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installation", "connection", "attachment", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0048] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as in multiple fields such as military equipment and aerospace. Lithium-ion batteries have been widely used in mobile and portable electrical appliances due to their advantages such as high energy density, high average open-circuit voltage and long cycle life.

[0049] The battery device is an important power source for electric vehicles. During the driving process of electric vehicles, the bottom of the battery device will be impacted by the splashing of road stones, sand, etc., resulting in the deformation of the bottom of the battery device and squeezing the battery cells inside the battery device, thereby causing the deformation and damage of the battery cells, and even causing a fire.

[0050] In view of the defects existing in the prior art, the purpose of the present application is to provide a battery device and an electrical device having the battery device, which can effectively solve the problem that the battery cells are squeezed and deformed due to the impact on the bottom of the battery device.

[0051] 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 a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0052] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; by way of example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. By way of example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0053] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0054] By way of example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0055] By way of example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0056] By way of example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which may be sealed or non-sealed. The first box body may be a top cover or a bottom plate.

[0057] By way of 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.

[0058] By way of example, the box body may be part of the chassis structure of a vehicle. For example, the top cover of the box body may become at least part of the floor of the vehicle, or the frame of the box body may become at least part of the cross beam and longitudinal beam of the vehicle.

[0059] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and a door is provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0060] In some embodiments, the energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery modules, and the plurality of battery modules are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0061] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption periods and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods. The energy storage system provided by the embodiments of the present application can be any power system that requires an energy storage device.

[0062] The technical solutions described in the embodiments of the present application are applicable to various electrical devices and energy storage devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, battery-powered vehicles, electric toys, power tools, vehicles, ships, spacecraft, and energy storage containers, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc.

[0063] Figure 1 It is a schematic structural diagram of a vehicle 1 provided by some embodiments of the present application. As Figure 1 shown, the vehicle 1 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. The vehicle 1 is internally provided with a battery device 10, and the battery device 10 can be arranged at the bottom, head, or tail of the vehicle 1. The battery device 10 can be used for the power supply of the vehicle 1. For example, the battery device 10 can be used as the operating power source of the vehicle 1. The vehicle 1 can also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0064] In some embodiments of the present application, the battery device 10 can not only be used as the operating power source of the vehicle 1 but also as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0065] Figure 2 It is a schematic structural diagram of a battery device 10 according to an embodiment of the present application. Figure 3 It is a schematic structural diagram of a battery cell assembly 20 according to an embodiment of the present application. Combining Figure 2 and Figure 3 shown, in order to meet different power usage requirements, the battery device 10 can include a plurality of battery cells 21. The battery cell 21 refers to the smallest unit that makes up the battery device 10. The plurality of battery cells 21 can be connected in series and / or in parallel via electrode terminals for various application scenarios. Among them, the plurality of battery cells 21 can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a combination of series and parallel connections.

[0066] Combining Figure 2 and Figure 3As shown, the battery device 10 may include a plurality of battery cell components 20 and a box body 30, and the plurality of battery cell components 20 are accommodated inside the box body 30. The box body 30 is used to accommodate the battery cells 21 or the battery cell components 20 to reduce the influence of liquid or other foreign objects on the charging or discharging of the battery cells 21. The box body 30 may be a simple three-dimensional structure such as a separate cuboid, cylinder or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder or sphere. The material of the box body 30 may be an alloy material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber reinforced epoxy resin.

[0067] In some embodiments, the box body 30 may include a first part 301 and a second part 302. The first part 301 and the second part 302 cover each other, and the first part 301 and the second part 302 jointly define a space for accommodating the battery cells 21. The second part 302 may be a hollow structure with one end open, and the first part 301 may be a plate-like structure. The first part 301 covers the open side of the second part 302 so that the first part 301 and the second part 302 jointly define a space for accommodating the battery cells 21; the first part 301 and the second part 302 may also both be hollow structures with one side open, and the open side of the first part 301 covers the open side of the second part 302.

[0068] The battery cell component 20 may include a plurality of battery cells 21. The plurality of battery cells 21 may be first connected in series, parallel or in a hybrid connection to form the battery cell component 20, and then the plurality of battery cell components 20 are connected in series, parallel or in a hybrid connection to form the battery device 10. The battery cells 21 may be in the shape of a cylinder, flat body, cuboid or other shapes, and the embodiments of the present application are not limited thereto. Generally, the battery cells 21 are divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application are not limited thereto. However, for the sake of simplicity of description, the following embodiments will be described by taking the square lithium-ion battery cells 21 as an example.

[0069] Figure 4 It is a schematic exploded view of the battery cell 21 provided by some embodiments of the present application. The battery cell 21 refers to the smallest unit that makes up the battery device 10. As Figure 4 , the battery cell 21 includes an end cap 211, a housing 212 and an electrode assembly 213.

[0070] The end cap 211 refers to a component that covers the opening of the housing 212 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cap 211 can be adapted to the shape of the housing 212 to cooperate with the housing 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 211 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 21 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on the end cap 211. The electrode terminals 214 can be used for electrical connection with the electrode assembly 213 to output or input the electrical energy of the battery cell 21. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold can also be provided on the end cap 211. In some embodiments, an insulating member can also be provided on the inner side of the end cap 211. The insulating member can be used to isolate the electrical connection components in the housing 212 from the end cap 211 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0071] The housing 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 21. Among them, the formed internal environment can be used to accommodate the electrode assembly 213, electrolyte (not shown in the figure), and other components. The housing 212 and the end cap 211 can be independent components. An opening can be provided on the housing 212, and the end cap 211 is covered on the opening to form the internal environment of the battery cell 21. Without limitation, the end cap 211 and the housing 212 can also be integrated. Specifically, the end cap 211 and the housing 212 can first form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 212, the end cap 211 is then covered on the housing 212. The housing 212 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 213. The material of the housing 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0072] The electrode assembly 213 is a component in the battery cell 21 where electrochemical reactions occur. The housing 212 can contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a separator is usually provided between the positive electrode plate and the negative electrode plate. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body of the electrode assembly 213, and the portions of the positive electrode plate and the negative electrode plate without active substances respectively constitute electrode tabs (not shown in the figure). The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals 214 to form a current loop.

[0073] Combined Figure 2 , Figures 4 to 8 As shown in FIGS., in some embodiments of the present application, the battery device 10 includes a box body 30 and a plurality of battery cells 21. The box body 30 includes a box main body 31 and a bottom plate assembly 32. An accommodation cavity is formed inside the box main body 31. At least one end of the box main body 31 along the first direction X is provided with an opening. The bottom plate assembly 32 is disposed at the opening at one end of the box main body 31 along the first direction X. The plurality of battery cells 21 are disposed inside the accommodation cavity. An assembly gap is formed between two adjacent battery cells 21. Among them, the bottom plate assembly 32 includes a first plate body 321 and a second plate body 322 disposed opposite to each other along the first direction X. The second plate body 322 is disposed on the side of the first plate body 321 facing the battery cell 21, and a buffer cavity 323 is formed between the second plate body 322 and the first plate body 321. At least one of the first plate body 321 and the second plate body 322 is provided with a rib protruding toward the other. The extending directions of at least some of the assembly gaps are the same as the extending directions of some of the ribs, and along the first direction X, the assembly gaps and the ribs having the same extending direction have an overlapping area in the orthographic projection.

[0074] Specifically, the box body 30 forms the overall appearance structure of the battery device 10. The box body 30 includes a box body 31 and a bottom plate assembly 32. The box body 31 is a roughly annular frame structure, and is provided with openings at both ends along the first direction X. The bottom plate assembly 32 is a plate-like structure with thickness, and is provided at an opening at one end of the box body 31 along the first direction X. The bottom plate assembly 32 is connected to the box body 31 and is used to block the opening at one end thereof. The other end of the box body 31 along the first direction X is in an open state, and the battery cell 21 can be placed inside the accommodating cavity through the opening at one end of the box body 31 along the first direction X away from the bottom plate assembly 32. The box body 31 and the bottom plate assembly 32 together constitute the second part 302 of the box body 30, and the box body 30 also includes a first part 301. The first part 301 can be a hollow structure with one end open, and covers the other end opening of the box body 31 away from the bottom plate assembly 32, or the first part 301 can be a plate-like structure, and covers the other end opening of the box body 31 away from the bottom plate assembly 32. Optionally, when the battery device 10 is installed at the bottom of the vehicle, the first direction X can be a vertical direction, and the bottom plate assembly 32 can be arranged at the bottom of the box body 31 along the vertical direction, and at the bottom of the battery cell 21 along the vertical direction. When the vehicle is running over, stones or gravel splashed from the bottom of the vehicle can hit the bottom of the battery device 10, that is, hit the side of the bottom plate assembly 32 away from the battery cell 21.

[0075] The bottom plate assembly 32 includes a first plate 321 and a second plate 322 which are arranged opposite to each other along the first direction X. The second plate 322 is arranged on the side of the first plate 321 facing the battery cell 21, that is, the first plate 321 is arranged on the side of the bottom plate assembly 32 away from the battery cell 21, and the splashing stones or gravel can hit the first plate 321. Among them, at least part of the second plate 322 is arranged at intervals from the first plate 321, and a buffer cavity 323 is formed between the two. Optionally, the edge of the second plate 322 is connected to the first plate 321, or the edge of the first plate 321 is connected to the second plate 322, so as to reduce the connection between the first plate 321 and the second plate 322 located below the battery cell 21. Since the connection is generally in a fitted state, there is no buffer cavity between the two. If the connection is directly placed below the battery cell 21, it is easy to squeeze the battery cell 21 when it is impacted and deformed, and the battery cell 21 is deformed and damaged. By forming a buffer cavity 323 between the two, when the first plate 321 is impacted, part of the first plate 321 bends and deforms in the direction of the buffer cavity 323, and cannot directly abut against the second plate 322, thereby reducing the impact on the second plate 322 and the battery cell 21. Among them, at least one of the first plate 321 and the second plate 322 is provided with a convex rib protruding toward the other, and the extension direction of at least a part of the assembly gap is the same as the extension direction of part of the convex rib, and the orthographic projection along the first direction X has an overlapping area. Optionally, only the surface of the first plate 321 facing the second plate 322 is provided with a convex rib; or only the surface of the second plate 322 facing the first plate 321 is provided with a convex rib; or the surface of the first plate 321 facing the second plate 322 is provided with a convex rib, and at the same time, the surface of the second plate 322 facing the first plate 321 is provided with a convex rib. Optionally, the second plate 322 may be bonded to the surface of the battery cell 21 along the first direction X, including direct bonding or bonding via an adhesive; or, the second plate 322 may be spaced apart from the surface of the battery cell 21 along the first direction X.

[0076] For the convenience of description, the present application only takes the example that the first plate body 321 is provided with the first rib 3211 on the surface facing the second plate body 322 .

[0077] According to the battery device 10 of the present application, by providing a buffer cavity 323 between the first plate body 321 and the second plate body 322, when the first plate body 321 is impacted and deformed, the buffer cavity 323 can reduce the impact on the second plate body 322 caused by the deformed first plate body 321, thereby reducing the impact on the battery cell 21. At the same time, by providing ribs protruding towards the other on at least one of the first plate body 321 and the second plate body 322, and at least part of the extending direction of the assembly gaps is the same as the extending direction of part of the ribs, and the assembly gaps with the same extending direction and the ribs have an overlapping area in the positive projection along the first direction X. When the first plate body 321 is impacted and deformed, the impact force generated by the first plate body 321 can be transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the assembly gap through the ribs, thereby reducing the impact force directly acting on the surface of the battery cell 21 along the first direction X, and further reducing the deformation and damage of the battery cell 21 under the action of the impact force.

[0078] Combined with Figures 4 to 8 As shown, in some embodiments of the present application, along the first direction X, the positive projection of at least part of the assembly gaps is completely within the range of the positive projection of part of the ribs.

[0079] Specifically, along the first direction X, at least part of the assembly gaps are arranged opposite to part of the first ribs 3211. The first ribs 3211 arranged opposite along the first direction X have the same extending direction as the extending direction of the assembly gaps, and the dimension of the extending direction of the first ribs 3211 is greater than or equal to the dimension of the extending direction of the assembly gaps. Along the arrangement direction of two adjacent battery cells 21, the dimension of the first ribs 3211 is greater than or equal to the dimension of the assembly gaps, that is, the positive projection along the first direction X of the side walls of the housing 212 of the battery cells 21 on both sides of the assembly gap is completely within the range of the positive projection of part of the first ribs 3211. Optionally, the battery cell 21 is a cuboid battery cell. The side walls of the housing 212 of the battery cells 21 on both sides of the assembly gap are arranged along the first direction X. Compared with the surface arranged on one side of the battery cell 21 along the first direction X, the side walls arranged along the first direction X have better anti-deformation ability under the action of the impact force along the first direction X. Therefore, by applying the impact force to the side walls of the housing 212 on both sides of the assembly gap, the deformation of the battery cell 21 can be reduced.

[0080] By completely arranging the positive projection of the assembly gaps within the range of the positive projection of part of the ribs, that is, the positive projection along the first direction X of the side walls of the housing 212 of the battery cells 21 on both sides of the assembly gap is completely within the range of the positive projection of part of the ribs, the range and effect of transmitting the impact force to the side walls of the housing 212 of the battery cells 21 on both sides of the assembly gap can be improved, and the deformation and damage of the battery cell 21 can be reduced.

[0081] Combined with Figures 4 to 8As shown, in some embodiments of the present application, the assembly gap includes a first assembly gap 22. At least a portion of the battery cells 21 are arranged along the second direction Y. A first assembly gap 22 is formed between two adjacent battery cells 21 along the second direction Y. The first assembly gap 22 extends along the third direction Z. The rib includes a first protruding portion 3212 extending along the third direction Z. Along the first direction X, the orthographic projection of the first assembly gap 22 and the orthographic projection of the first protruding portion 3212 have an overlapping area, wherein the first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs.

[0082] Specifically, the assembly gap includes a first assembly gap 22. The first assembly gap 22 is arranged between two adjacent battery cells 21 along the second direction Y and extends along the third direction Z. The first rib 3211 includes a plurality of first protruding portions 3212. The plurality of first protruding portions 3212 are arranged at intervals along the second direction Y. Any one of the first protruding portions 3212 extends along the third direction Z respectively. Among them, the plurality of first protruding portions 3212 and the plurality of first assembly gaps 22 are arranged in one-to-one correspondence along the first direction X. And along the first direction X, the orthographic projection of the first assembly gap 22 and the orthographic projection of the first protruding portion 3212 have an overlapping area. Optionally, when the battery device 10 is installed at the bottom of a vehicle, the first direction X can be the vertical direction, the second direction Y can be one of the length direction and the width direction of the battery device 10, and the third direction Z can be the other of the length direction and the width direction of the battery device 10.

[0083] By arranging the first assembly gap 22 and the first protruding portion 3212 to extend along the third direction Z respectively, and making the orthographic projection of the first assembly gap 22 and the orthographic projection of the first protruding portion 3212 have an overlapping area, when the first plate body 321 is impacted and deformed, the impact force generated by the first plate body 321 can be transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the first assembly gap 22 through the first protruding portion 3212, thereby reducing the deformation and damage of the battery cells 21.

[0084] Combined with Figures 4 to 8 As shown, in some embodiments of the present application, along the first direction X, the orthographic projection of the first assembly gap 22 is completely within the range of the orthographic projection of the first protruding portion 3212.

[0085] Specifically, along the first direction Z, the first assembly gap 22 and the first protruding portion 3212 are arranged oppositely, and the dimension of the first protruding portion 3212 along the second direction Y is greater than or equal to the dimension of the first assembly gap 22 along the second direction Y, and the dimension of the first protruding portion 3212 along the third direction Z is greater than or equal to the dimension of the first assembly gap 22 along the third direction Z, so that the orthographic projection of the side walls of the housing 212 of the battery cells 21 on both sides of the first assembly gap 22 along the first direction X is completely within the range of the orthographic projection of a part of the first protruding portion 3212.

[0086] By completely setting the positive projection of the first assembly gap 22 within the range of the positive projection of the first convex portion 3212, that is, the side walls of the housing 212 of the battery cells 21 on both sides of the first assembly gap 22 are completely within the range of the positive projection of the first convex portion 3212 along the positive direction X of the first direction, thereby improving the range and effect of the impact force transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the first assembly gap 22, and reducing the deformation and damage of the battery cells 21.

[0087] Combined with Figures 4 to 8 As shown, in some embodiments of the present application, the assembly gap further includes a second assembly gap (not shown in the figure). The battery device 10 includes a plurality of battery cell assemblies 20 arranged along the third direction Z. Any one of the battery cell assemblies 20 includes a partial number of battery cells 21 arranged along the second direction Y. A second assembly gap is formed between adjacent battery cell assemblies 20. The second assembly gap extends along the second direction Y. The rib further includes a second convex portion 3213 extending along the second direction Y. Along the first direction X, the positive projection of the second assembly gap and the positive projection of the second convex portion 3213 have an overlapping area.

[0088] Specifically, the assembly gap further includes a second assembly gap. The second assembly gap is arranged between two adjacent battery cell assemblies 20 along the third direction Z and extends along the second direction Y. The first rib 3211 further includes a plurality of second convex portions 3213. The plurality of second convex portions 3213 are arranged at intervals along the third direction Z. Any one of the second convex portions 3213 extends along the second direction Y respectively. Among them, the plurality of second convex portions 3213 and the plurality of second assembly gaps are arranged in one-to-one correspondence along the first direction X, and along the first direction X, the positive projection of the second assembly gap and the positive projection of the second convex portion 3213 have an overlapping area.

[0089] By arranging the second assembly gap and the second protrusion 3213 to extend along the second direction Y respectively, and making the orthographic projection of the second assembly gap coincide with the orthographic projection of the second protrusion 3213, when the first plate 321 is impacted and deformed, the impact force generated by the first plate 321 can be transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the second assembly gap through the second protrusion 3213, thereby reducing the deformation and damage of the battery cells 21. Moreover, by arranging the first protrusion 3212 and the second protrusion 3213 simultaneously, and arranging the extending directions of the first protrusion 3212 and the second protrusion 3213 to intersect and form a grid-like structure, when an impact occurs at a certain position of the grid-like structure, it can be transmitted to other nearby ribs through the grid-like structure, and then transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the assembly gap arranged corresponding to the first direction X through the ribs, thereby dispersing the impact force and reducing the deformation and damage of the battery cells 21.

[0090] Combined with Figures 4 to 8 As shown, in some embodiments of the present application, along the first direction X, the orthographic projection of the second assembly gap is completely within the range of the orthographic projection of the second protrusion 3213.

[0091] Specifically, along the first direction X, the second assembly gap is arranged opposite to the second protrusion 3213, and the dimension of the second protrusion 3213 along the second direction Y is greater than or equal to the dimension of the second assembly gap along the second direction, and the dimension of the second protrusion 3213 along the third direction Z is greater than or equal to the dimension of the second assembly gap along the third direction Z, so that the orthographic projection of the side walls of the housing 212 of the battery cells 21 on both sides of the second assembly gap along the first direction X is completely within the range of the orthographic projection of a part of the second protrusion 3213.

[0092] By arranging the orthographic projection of the second assembly gap completely within the range of the orthographic projection of the second protrusion 3213, that is, the orthographic projection of the side walls of the housing 212 of the battery cells 21 on both sides of the second assembly gap along the first direction X is completely within the range of the orthographic projection of the second protrusion 3213, thereby improving the range and effect of the impact force transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the second assembly gap, and reducing the deformation and damage of the battery cells 21.

[0093] Combined with Figures 4 to 8 As shown, in some embodiments of the present application, the battery cell 21 includes a first surface 2121 with the largest area, and the first surface 2121 is perpendicular to the second direction Y.

[0094] Specifically, the battery cell 21 can be a cuboid battery cell, and the battery cell 21 includes a length direction, a width direction, and a height direction. Among them, the dimensions in the length direction and the height direction of the battery cell 21 are respectively greater than the dimension in the width direction. Therefore, the surface of the battery cell 21 that simultaneously has the length dimension and the height dimension is the first surface 2121 with the largest area of the battery cell 21. Optionally, the length direction of the battery cell 21 is consistent with the third direction X, the width direction of the battery cell 21 is consistent with the second direction Y, the height direction of the battery cell 21 is consistent with the first direction X, and the first surface 2121 of the battery cell 21 is perpendicular to the width direction of the battery cell 21, that is, the first surface 2121 is perpendicular to the second direction Y. Optionally, the battery cell 21 can also be a cylindrical battery cell, wherein the axial direction of the cylindrical battery cell is consistent with the first direction X.

[0095] By arranging the first surface 2121 perpendicular to the second direction Y, it is possible to reduce the impact force acting on the first surface 2121 in a direction perpendicular to the first surface 2121, thereby reducing the extrusion deformation of the first surface 2121 under the action of the impact force, and further reducing the deformation and damage of the battery cell 21.

[0096] Combined with Figures 5 to 8 As shown, in some embodiments of the present application, the first plate body 321 is connected to the box body 31 and is used to block one end opening of the box body 31, and the second plate body 322 is arranged inside the accommodation cavity.

[0097] Specifically, the first plate body 321 is arranged at one end opening of the box body 31 and is connected to the edge of the opening, so as to block one end of the accommodation cavity. The second plate body 322 is connected to the first plate body 321 and is arranged inside the accommodation cavity.

[0098] By arranging the second plate body 322 inside the accommodation cavity, a lining plate structure is formed, thereby reducing the dimension of the battery cell 21 in the first direction X.

[0099] Combined with Figures 5 to 8 As shown, in some embodiments of the present application, the second plate body 322 includes a heat exchange plate, and the heat exchange plate is configured to perform heat exchange with the battery cell 21.

[0100] Specifically, heat exchange channels are formed inside the heat exchange plate, and the heat exchange channels are used to circulate the heat exchange medium. During the flow of the heat exchange medium in the heat exchange channels, the temperature of the heat exchange plate can be adjusted, and then the heat exchange plate exchanges heat with the battery cell 21, thereby adjusting the temperature of the battery cell 21. Optionally, the heat exchange plate can be in a flat plate structure, with a cavity formed inside it to form the heat exchange channels. Or, a protruding flow channel groove is formed on the side of the heat exchange plate facing away from the battery cell 21, and the heat exchange channels are formed inside the flow channel groove. Among them, the flow channel groove can be equivalent to the rib in the present application, and the flow channel groove is in the same extension direction as part of the assembly gap and is arranged oppositely along the first direction X.

[0101] By setting the second plate body 322 as the heat exchange plate, the heat exchange plate can exchange heat with the battery cell 21, thereby adjusting the temperature of the battery cell 21, and further improving the performance of the battery device 10.

[0102] Combined with Figures 5 to 11 As shown in the figure, in some embodiments of the present application, the second plate body 322 is provided with a through hole 3222 for circulating the electrophoresis solution, and the through hole 3222 communicates with the buffer cavity 323.

[0103] Specifically, when the first plate body 321 or the second plate body 322 has an anti-corrosion requirement, an electrophoresis process can be added after the bottom plate assembly 32 is assembled with the box body 31. Since the first plate body 321 is connected to the box body 31 and the second plate body 322 is arranged inside the accommodating cavity, by providing a through hole 3222 in the second plate body 322, the electrophoresis solution can enter the buffer cavity 323 between the first plate body 321 and the second plate body 322 through the through hole 3222, thereby performing electrophoresis on the opposite surfaces of the first plate body 321 and the second plate body 322 and forming an electrophoresis protective layer. At the same time, the through hole 3222 is provided in the second plate body 322, which will not reduce the sealing performance of the box body 30.

[0104] By providing a through hole 3222 in the second plate body 322 that communicates with the buffer cavity 323, the electrophoresis solution can flow into or out of the buffer cavity 323 through the through hole 3222, thereby performing electrophoresis on the inner wall surface of the buffer cavity 323 and forming an electrophoresis protective layer on the surface of the first plate body 321 facing the second plate body 322 and the surface of the second plate body 322 facing the first plate body 321, and further improving the corrosion resistance of the bottom plate assembly 32.

[0105] Combined with Figures 5 to 11 As shown in the figure, in some embodiments of the present application, an insulating member 40 is provided on the side of the battery cell 21 facing the bottom plate assembly 32 along the first direction X, and the insulating member 40 is clamped between the battery cell 21 and the second plate body 322 and covers the through hole 3222.

[0106] Specifically, to reduce the direct exposure of the through-hole 3222 to the bottom of the battery cell 21, the battery device 10 is further provided with an insulating member 40. The insulating member 40 can be adhered to the bottom of the battery cell 21 and is disposed opposite to the through-hole 3222 in the first direction X. When the battery cell 21 is assembled into the interior of the accommodation cavity, the insulating member 40 is clamped between the battery cell 21 and the second plate body 322 and covers the through-hole 3222. Optionally, the insulating member 40 can be a foam strip and is extendedly disposed along the second direction Y.

[0107] By clamping the insulating member 40 between the battery cell 21 and the second plate body 322 and covering the through-hole 3222, it is possible to reduce the particles in the box body 30 from falling into the interior of the buffer cavity 323 through the through-hole 3222, thereby reducing the noise generated by the particles hitting the inner wall of the buffer cavity 323.

[0108] As Figure 12 shown, in some embodiments of the present application, the second plate body 322 is connected to the box body 31 and is used to block one end opening of the box body 31, and the first plate body 321 is disposed outside the accommodation cavity.

[0109] Specifically, the second plate body 322 is disposed at one end opening of the box body 31 and is connected to the edge of the opening, so as to be used to block one end of the accommodation cavity. The first plate body 321 is connected to the second plate body 322 and is disposed outside the accommodation cavity.

[0110] By disposing the first plate body 321 outside the accommodation cavity, an outer protection plate structure is formed, thereby increasing the size of the accommodation cavity in the first direction X, increasing the size of the battery cell 21, and further increasing the power of the battery device 10.

[0111] Combined with Figures 4 to 8 and Figure 12 shown, in some embodiments of the present application, the rib includes a first rib 3211. The first plate body 321 protrudingly provided with the first rib 3211 on the side facing the second plate body 322. The extending direction of at least part of the assembly gaps is the same as the extending direction of at least part of the first ribs 3211, and there is an overlapping area in the positive projection along the first direction X.

[0112] Specifically, the rib structure is only provided on the first plate body 321, and the second plate body 322 can be a shaped structure. Among them, the first rib 3211 may include a plurality of first protrusions 3212 respectively extending along the third direction Z. The plurality of first protrusions 3212 are arranged at intervals along the second direction Y. The assembly gaps include a plurality of first assembly gaps 22 arranged at intervals along the second direction Y, and the plurality of first protrusions 3212 and the plurality of first assembly gaps 22 are arranged in one-to-one correspondence along the first direction X. Thus, the impact force is transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the first assembly gap 22 through the first protrusions 3212. The first rib 3211 further includes a plurality of second protrusions 3213 respectively extending along the second direction Y. The plurality of second protrusions 3213 are arranged at intervals along the third direction Z. The assembly gaps further include a plurality of second assembly gaps arranged at intervals along the third direction Z, and the plurality of second protrusions 3213 and the plurality of second assembly gaps are arranged in one-to-one correspondence along the first direction Z. Thus, the impact force is transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the second assembly gap through the second protrusions 3213.

[0113] By providing the first rib 3211 on the first plate body 321, when the first plate body 321 is impacted and deformed, the impact force generated by the first plate body 321 can be transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the assembly gap through at least part of the first rib 3211, thereby reducing the deformation and damage of the battery cells 21.

[0114] Combined Figures 13 to 17 As shown, in some embodiments of the present application, the rib includes a first rib 3211 and a second rib 3221. The first plate body 321 protrudes with a first rib 3211 on the side facing the second plate body 322, and the second plate body 322 protrudes with a second rib 3221 on the side facing the first plate body 321. The extending directions of at least part of the assembly gaps, at least part of the first rib 3211, and at least part of the second rib 3221 are the same, and there is an overlapping area in the positive projection along the first direction X.

[0115] Specifically, the second rib 3221 may have the same structure as the first rib 3211 and be arranged opposite to each other along the first direction X. Optionally, the first rib 3211 and the second rib 3221 may respectively only include the first protrusions 3212; or, the first rib 3211 and the second rib 3221 may respectively only include the second protrusions 3213; or, the first rib 3211 and the second rib 3221 may respectively include both the first protrusions 3212 and the second protrusions 3213 at the same time.

[0116] By providing a first rib 3211 on the first plate body 321 and a second rib 3221 on the second plate body 322, when the first plate body 321 is impacted and deformed, the impact force generated by the first plate body 321 can be transmitted to the side walls of the housing 212 of the battery cell 21 on both sides of the assembly gap through at least part of the first rib 3211 and at least part of the second rib 3221 in sequence, thereby reducing the deformation and damage of the battery cell 21.

[0117] Combined with Figures 5 to 11 As shown, in some embodiments of the present application, a recessed portion 3223 is formed by partially recessing the second plate body 322 towards the first plate body 321, and the recessed portion 3223 is adhesively connected to the first plate body 321.

[0118] Specifically, when the plate surface dimensions of the first plate body 321 and the second plate body 322 are too large, in order to improve the connection strength between the two, a part of the structure provided on the second plate body 322 away from the edge is recessed towards the first plate body 321 to form a recessed portion 3223, and the recessed portion 3223 is adhesively connected to the first plate body 321. Optionally, the recessed portion 3223 and the first plate body 321 can be adhesively bonded or riveted.

[0119] By partially recessing the second plate body 322 towards the first plate body 321 to form a recessed portion 3223 and adhesively connecting the recessed portion 3223 to the first plate body 321, the connection strength between the first plate body 321 and the second plate body 322 can be improved. At the same time, by recessing the connection portion between the second plate body 322 and the first plate body 321, the contact between the connection portion and the battery cell 21 can be reduced, and the deformation and damage of the battery cell 21 caused by the connection portion being squeezed under the action of the impact force can be reduced.

[0120] Combined with Figures 5 to 11 As shown, in some embodiments of the present application, the bottom plate assembly 32 further includes a buffer member 3224, and the buffer member 3224 is disposed on the side of the recessed portion 3223 facing the battery cell 21.

[0121] Specifically, the buffer member 3224 is disposed on the side of the recessed portion 3223 facing the battery cell 21 and can be placed in the concave pit formed by the recessed portion 3223, thereby reducing the phenomenon of the buffer member 3224 falling off or being displaced. Optionally, the buffer member 3224 can be a rubber pad or a foam pad.

[0122] By providing a buffer member 3224 on the side of the recessed portion 3223 facing the battery cell 21, the buffer member 3224 can reduce the impact force of the second plate body 322 on the battery cell 21, and further reduce the deformation and damage of the battery cell 21.

[0123] Combined with Figures 4 to 8 As shown, in some embodiments of the present application, the end face of the rib along the first direction X is an arc surface.

[0124] Specifically, taking the first convex portion 3212 provided on the first plate body 321 as an example, the end face of the first convex portion 3212 facing the second plate body 322 is an arc surface, and the diameter dimension of the corresponding circle of the arc surface needs to be greater than the dimension of the first assembly gap 22 in the second direction Y. Thus, when the first convex portion 3212 presses the second plate body 322 and the battery cell 21, the impact force can be transmitted to the side walls of the housing 212 of the battery cells 21 on both sides of the first assembly gap 22. Optionally, the range of the diameter dimension of the corresponding circle of the arc surface is 1.0 mm to 15 mm.

[0125] By setting the end face of the rib along the first direction X as an arc surface, it is possible to reduce the stress concentration caused by the rib being squeezed under the action of the impact force, thereby reducing the deformation and cracking of the rib.

[0126] Figure 1 As shown in the figure, in the second aspect of the present application, an electrical device is proposed. The electrical device includes the battery device 10 according to any one of the above.

[0127] Since the electrical device in the present application has the same technical features as the battery device 10 in any of the above embodiments and can achieve the same technical effects, it will not be elaborated herein.

[0128] As Figure 1 shown, in some embodiments of the present application, the electrical device may be a vehicle 1. The vehicle 1 includes the battery device 10 according to any one of the above embodiments. The battery device 10 is used to provide electrical energy for the vehicle 1 and is used to drive the vehicle 1 to move.

[0129] The above description is only an overview of the technical solution of the present application. In order to be able to more clearly understand the technical means of the present application, it can be implemented according to the content of the specification. And in order to make the above and other objects, features and advantages of the present application more obvious and understandable, the following specifically illustrates the embodiments of the present application.

[0130] Combined with Figure 2 、 Figures 4 to 11As shown, in some embodiments of the present application, the battery device includes a box body 30 and a plurality of battery cells 21. The box body 30 includes a box main body 31 and a bottom plate assembly 32. An accommodation cavity is formed inside the box main body 31. Openings are respectively provided at both ends of the box main body 31 along the first direction X. The bottom plate assembly 32 is arranged along the first direction X at the opening at one end of the box main body 31. The plurality of battery cells 21 are arranged inside the accommodation cavity, and an assembly gap is formed between two adjacent battery cells 21. Among them, the bottom plate assembly 32 includes a first plate body 321 and a second plate body 322 arranged opposite to each other along the first direction X. The second plate body 322 is arranged on the side of the first plate body 321 facing the battery cell 21, and a buffer cavity 323 is formed between the second plate body 322 and the first plate body 321. The first plate body 321 is provided with a first rib 3211 protruding towards the second plate body 322. The extending direction of at least part of the assembly gaps is the same as the extending direction of part of the first ribs 3211, and along the first direction, the orthographic projection of at least part of the assembly gaps is completely within the orthographic projection range of part of the first ribs 3211.

[0131] Among them, the assembly gap includes a first assembly gap 22. At least part of the battery cells 21 are arranged in a row along the second direction Y to form a battery cell assembly 20. A first assembly gap 22 is formed between two adjacent battery cells 21 along the second direction Y. The first assembly gap 22 extends along the third direction Z. The first rib 3211 includes a first protruding portion 3212 extending along the third direction Z. Along the first direction X, the orthographic projection of the first assembly gap 22 is completely within the orthographic projection range of the first protruding portion 3212. The assembly gap further includes a second assembly gap. The battery device 10 includes a plurality of battery cell assemblies 20. The plurality of battery cell assemblies 20 are arranged in a row along the third direction Z. Any one of the battery cell assemblies 20 includes part of the battery cells 21 arranged in a row along the second direction Y. A second assembly gap is formed between adjacent battery cell assemblies 20. The second assembly gap extends along the second direction Y. The first rib 3211 further includes a second protruding portion 3213 extending along the second direction Y. Along the first direction X, the orthographic projection of the second assembly gap is completely within the orthographic projection range of the second protruding portion 3213.

[0132] Among them, the first plate body 321 is connected to the box body 31 and is used to seal one end opening of the box body 31. The second plate body 322 is arranged inside the accommodation cavity. A through hole 3222 for the electrophoresis solution to flow through is provided through the second plate body 322, and the through hole 3222 communicates with the buffer cavity 323. An insulating member 40 is provided on one side of the battery cell 21 facing the bottom plate assembly 32 along the first direction X. The insulating member 40 is clamped between the battery cell 21 and the second plate body 322 and covers the through hole 3222. The battery cell 21 includes a first surface 2121 with the largest area, and the first surface 2121 is perpendicular to the second direction Y. A recessed portion 3223 is formed by the partial second plate body 322 recessing toward the first plate body 321, and the recessed portion 3223 is attached and connected to the first plate body 321. The bottom plate assembly 32 further includes a buffer member 3224, and the buffer member 3224 is arranged on the side of the recessed portion 3223 facing the battery cell 21. The end face of the first rib 3211 along the first direction X is an arc surface.

[0133] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A box body, the box body includes a box main body and a bottom plate assembly, an accommodation cavity is formed inside the box main body, at least one end of the box main body in the first direction is provided with an opening, and the bottom plate assembly is arranged at the opening at one end of the box main body along the first direction; A plurality of battery cells, the plurality of battery cells are arranged inside the accommodation cavity, and an assembly gap is formed between adjacent two of the battery cells; Wherein, the bottom plate assembly includes a first plate body and a second plate body arranged opposite to each other along the first direction, the second plate body is arranged on the side of the first plate body facing the battery cell, and a buffer cavity is formed between the second plate body and the first plate body, at least one of the first plate body and the second plate body is provided with a rib protruding towards the other, at least part of the extending direction of the assembly gaps is the same as the extending direction of part of the ribs, and along the first direction, the orthographic projections of the assembly gaps with the same extending direction and the ribs have an overlapping area.

2. The battery device according to claim 1, characterized in that, Along the first direction, the orthographic projection of at least part of the assembly gaps is completely within the range of the orthographic projection of part of the ribs.

3. The battery device according to claim 1, wherein The assembly gap includes a first assembly gap, at least part of the battery cells are arranged in a row along the second direction, the first assembly gap is formed between two adjacent battery cells along the second direction, the first assembly gap extends along the third direction, the rib includes a first protruding portion extending along the third direction, along the first direction, the orthographic projection of the first assembly gap and the orthographic projection of the first protruding portion have an overlapping area, wherein, the first direction, the second direction and the third direction are perpendicular to each other pairwise.

4. The battery device according to claim 3, characterized in that, Along the first direction, the orthographic projection of the first assembly gap is completely within the range of the orthographic projection of the first protruding portion.

5. The battery device according to claim 3, characterized in that, The assembly gap further includes a second assembly gap, the battery device includes a plurality of battery cell assemblies, the plurality of battery cell assemblies are arranged in a row along the third direction, any one of the battery cell assemblies includes part of the battery cells arranged in a row along the second direction, the second assembly gap is formed between adjacent battery cell assemblies, the second assembly gap extends along the second direction, the rib further includes a second protruding portion extending along the second direction, along the first direction, the orthographic projection of the second assembly gap and the orthographic projection of the second protruding portion have an overlapping area.

6. The battery device according to claim 5, characterized in that, Along the first direction, the orthographic projection of the second assembly gap is completely within the range of the orthographic projection of the second protruding portion.

7. The battery device according to claim 5, wherein The battery cell includes a first surface with the largest area, and the first surface is perpendicular to the second direction.

8. The battery device according to any one of claims 1 to 7, characterized in that, The first plate body is connected to the box main body and is used to block the opening at one end of the box main body, and the second plate body is arranged inside the accommodation cavity.

9. The battery device according to claim 8, wherein The second plate body includes a heat exchange plate, and the heat exchange plate is configured to perform heat exchange with the battery cell.

10. The battery device according to claim 8, wherein, The second plate body is provided with through holes for circulating electrophoresis liquid, and the through holes are communicated with the buffer cavity.

11. The battery device according to claim 10, characterized in that, An insulating member is provided on one side of the battery cell facing the bottom plate assembly along the first direction. The insulating member is clamped between the battery cell and the second plate body and covers the through hole.

12. The battery device according to any one of claims 1 to 7, characterized in that, The second plate body is connected to the box body and is used to block one end opening of the box body. The first plate body is arranged outside the accommodating cavity.

13. The battery device according to any one of claims 1 to 7, characterized in that, The rib includes a first rib. The first rib protrudes from one side of the first plate body facing the second plate body. The extending direction of at least part of the assembly gaps is the same as the extending direction of at least part of the first rib, and there is an overlapping area in the positive projection along the first direction.

14. The battery device according to any one of claims 1 to 7, characterized in that, The rib includes a first rib and a second rib. The first rib protrudes from one side of the first plate body facing the second plate body. The second rib protrudes from one side of the second plate body facing the first plate body. The extending direction of at least part of the assembly gaps, the extending direction of at least part of the first rib, and the extending direction of at least part of the second rib are the same, and there is an overlapping area in the positive projection along the first direction.

15. The battery device according to any one of claims 1 to 7, characterized in that, A recessed portion is formed by the depression of a part of the second plate body facing the first plate body. The recessed portion is in fit connection with the first plate body.

16. The battery device according to claim 15, characterized in that, The bottom plate assembly further includes a buffer member. The buffer member is arranged on the side of the recessed portion facing the battery cell.

17. The battery device according to any one of claims 1 to 7, characterized in that The end face of the rib along the first direction is an arc surface.

18. An electrical device, characterized in that, Including the battery device according to any one of claims 1 to 17.

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