Battery devices and electrical equipment

Abstract

The present application relates to a battery device and an electrical device. The battery device of the present application includes a box body and a plurality of battery cells. The box body includes a box body and a bottom plate assembly. A storage cavity is formed inside the box body. At least one end of the box body along a first direction is provided with an opening. The bottom plate assembly is provided at the opening at one end of the box body along the first direction. The plurality of battery cells are provided inside the storage cavity. An assembly gap is formed between two adjacent battery cells. The bottom plate assembly includes a first plate body and a second plate body that are arranged opposite to each other along the first direction. The second plate body is provided on a side of the first plate body facing the battery cells and forms a buffer cavity 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 toward the other. The extension direction of at least some of the assembly gaps is the same as the extension direction of some of the ribs. In addition, along the first direction, the assembly gaps extending in the same direction and the orthographic projections of the ribs have overlapping areas.

Description

Technical Field

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

[0002] The battery unit is an important power source for electric vehicles. When electric vehicles are driving, the splash of stones, gravel, etc. on the road will cause impact on the bottom of the battery unit, causing the bottom of the battery unit to deform and squeeze the battery cells inside the battery unit, thereby causing deformation and damage to the battery cells, and even fire. Summary of the Invention

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

[0004] In a first aspect, the present application provides a battery device, comprising:

[0005] The box body includes a box body and a bottom plate assembly, wherein a receiving cavity is formed inside the box body, at least one end of the box body along the first direction is provided with an opening, and the bottom plate assembly is provided at the opening at one end of the box body along the first direction;

[0006] A plurality of battery cells are arranged inside the accommodating cavity, and an assembly gap is formed between two adjacent battery cells;

[0007] In which, the bottom plate assembly includes a first plate body and a second plate body arranged opposite to each other along a 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 convex rib protruding toward the other, and the extension direction of at least a part of the assembly gaps is the same as the extension direction of part of the convex ribs, and along the first direction, the assembly gaps with the same extension direction have an overlapping area with the orthographic projection of the convex ribs.

[0008] According to the battery device of the present application, a buffer cavity is provided between the first plate and the second plate. When the first plate is deformed by impact, the buffer cavity can reduce the impact of the deformed first plate on the second plate, thereby reducing the impact on the battery cell. At the same time, at least one of the first plate and the second plate is provided with a rib protruding toward the other, and the extension direction of at least a part of the assembly gaps is the same as the extension direction of part of the ribs, and the assembly gaps with the same extension direction have an overlapping area with the positive projection of the ribs along the first direction. When the first plate is deformed by impact, the impact force generated by the first plate can be transmitted to the side walls of the shell of the battery cell on both sides of the assembly gap through the ribs, thereby reducing the impact force directly acting on the surface of the battery cell along the first direction, and further reducing the deformation and damage of the battery cell under the action of the impact force.

[0009] In some embodiments of the present application, along the first direction, orthographic projections of at least some of the assembly gaps are completely within the range of orthographic projections of some of the ribs.

[0010] By setting the orthographic projection of the assembly gap completely within the range of the orthographic projection of some convex ribs, that is, the orthographic projections of the side walls of the shell of the battery cells on both sides of the assembly gap along the first direction are completely within the range of the orthographic projection of some convex ribs, the range and effect of the impact force transmitted to the side walls of the shell of the battery cells on both sides of the assembly gap are improved, thereby reducing the deformation and damage of the battery cells.

[0011] In some embodiments of the present application, the assembly gap includes a first assembly gap, at least a portion of the 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 protrusion extending along the third direction, and along the first direction, the orthographic projection of the first assembly gap and the orthographic projection of the first protrusion have an overlapping area, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0012] By extending the first assembly gap and the first protrusion along the third direction respectively, and making the orthographic projection of the first assembly gap and the orthographic projection of the first protrusion have an overlapping area, when the first plate body is deformed by impact, the impact force generated by the first plate body can be transmitted to the side walls of the shell of the battery cell on both sides of the first assembly gap through the first protrusion, thereby reducing deformation and damage to the battery cell.

[0013] 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 protrusion.

[0014] By setting the orthographic projection of the first assembly gap completely within the range of the orthographic projection of the first protrusion, that is, the orthographic projections of the side walls of the shell of the battery cells on both sides of the first assembly gap along the first direction are completely within the range of the orthographic projection of the first protrusion, the range and effect of the impact force transmitted to the side walls of the shell of the battery cells on both sides of the first assembly gap are improved, thereby reducing deformation and damage of the battery cells.

[0015] In some embodiments of the present application, the assembly gap also includes a second assembly gap, the battery device includes a plurality of battery cell assemblies, the plurality of battery cell assemblies are arranged along a third direction, any 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 also includes a second raised portion extending along the second direction, and along the first direction, the orthographic projection of the second assembly gap and the orthographic projection of the second raised portion have an overlapping area.

[0016] By extending the second assembly gap and the second protrusion along the second direction, respectively, and ensuring that the orthographic projection of the second assembly gap overlaps with the orthographic projection of the second protrusion, when the first plate is deformed by an impact, the impact force generated by the first plate can be transmitted through the second protrusion to the side walls of the battery cell housing on both sides of the second assembly gap, thereby reducing deformation and damage to the battery cell. Furthermore, by simultaneously providing the first and second protrusions, with the first and second protrusions extending in intersecting directions to form a grid structure, when an impact occurs at a certain position of the grid structure, the impact force can be transmitted through the grid structure to other nearby ribs, and then through the ribs to the side walls of the battery cell housing on both sides of the corresponding assembly gap arranged along the first direction, thereby dispersing the impact force and reducing deformation and damage to the battery cell.

[0017] 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.

[0018] By setting the orthographic projection of the second assembly gap completely within the range of the orthographic projection of the second protrusion, that is, the projections of the side walls of the shell 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, the range and effect of the impact force transmitted to the side walls of the shell of the battery cells on both sides of the second assembly gap are improved, thereby reducing deformation and damage to the battery cells.

[0019] 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.

[0020] By arranging the first surface perpendicular to the second direction, the impact force acting on the first surface in 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 deformation and damage of the battery cell.

[0021] In some embodiments of the present application, the first plate is connected to the box body and is used to seal an opening at one end of the box body, and the second plate is arranged inside the accommodating cavity.

[0022] By arranging the second plate body inside the accommodating cavity, an inner lining plate structure is formed, thereby reducing the size of the battery cell along the first direction.

[0023] In some embodiments of the present application, the second plate body includes a heat exchange plate configured to exchange heat with the battery cells.

[0024] By configuring the second plate body as a heat exchange plate, the heat exchange plate can exchange heat with the battery cells, thereby adjusting the temperature of the battery cells and further improving the performance of the battery device.

[0025] In some embodiments of the present application, the second plate body is penetrated by a through hole for circulating the electrophoretic liquid, and the through hole is connected to the buffer cavity.

[0026] By arranging a through hole connected to the buffer cavity on the second plate body, the electrophoretic liquid can flow into or out of the interior of the buffer cavity through the through hole, thereby performing electrophoresis on the inner wall surface of the buffer cavity, and forming an electrophoretic 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.

[0027] 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 sandwiched between the battery cell and the second plate body and covers the through hole.

[0028] By sandwiching the insulating member between the battery cell and the second plate and covering the through hole, particles in the box can be reduced from falling into the buffer cavity through the through hole, thereby reducing the noise generated by particles hitting the inner wall of the buffer cavity.

[0029] In some embodiments of the present application, the second plate is connected to the box body and is used to seal an opening at one end of the box body, and the first plate is arranged outside the accommodating cavity.

[0030] By arranging the first plate body outside the accommodating cavity, an outer protective plate structure is formed, thereby increasing the size of the accommodating cavity along the first direction, increasing the size of the battery cell, and thus increasing the power of the battery device.

[0031] In some embodiments of the present application, the convex rib includes a first convex rib, and the first plate body is provided with a first convex rib protruding from one side toward the second plate body. The extension direction of at least a portion of the assembly gaps is the same as the extension direction of at least a portion of the first convex rib, and the orthographic projection along the first direction has an overlapping area.

[0032] By providing the first rib on the first plate, when the first plate is deformed by impact, the impact force generated by the first plate can be transmitted to the side walls of the battery cell shell on both sides of the assembly gap through at least a portion of the first rib, thereby reducing deformation and damage to the battery cell.

[0033] In some embodiments of the present application, the convex rib includes a first convex rib and a second convex rib, the first plate body is protruding from one side of the second plate body and is provided with a first convex rib, the second plate body is protruding from one side of the first plate body and is provided with a second convex rib, the extension direction of at least part of the assembly gap, the extension direction of at least part of the first convex rib and the extension direction of at least part of the second convex rib are the same, and the orthographic projection along the first direction has an overlapping area.

[0034] By arranging a first rib on the first plate body and a second rib on the second plate body, when the first plate body is deformed by impact, the impact force generated by the first plate body can be transmitted in sequence to the side walls of the shell of the battery cell on both sides of the assembly gap through at least a portion of the first rib and at least a portion of the second rib, thereby reducing deformation and damage to the battery cell.

[0035] In some embodiments of the present application, a portion of the second plate body is recessed toward the first plate body to form a recessed portion, and the recessed portion is fitted and connected to the first plate body.

[0036] By recessing a portion of the second plate toward the first plate to form a recessed portion, and then fitting the recessed portion to the first plate, the connection strength between the first and second plates can be improved. Furthermore, recessing the connection between the second and first plates can reduce contact between the connection and the battery cells, thus reducing the risk of deformation and damage to the battery cells due to impact forces.

[0037] In some embodiments of the present application, the base plate assembly further includes a buffer member, which is disposed on a side of the recessed portion facing the battery cell.

[0038] By arranging 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 on the battery cell, thereby reducing deformation and damage of the battery cell.

[0039] In some embodiments of the present application, the end surface of the rib along the first direction is an arc surface.

[0040] By setting the end surface of the rib along the first direction as an arc surface, the stress concentration caused by the rib being squeezed under the action of impact force can be reduced, thereby reducing the deformation and rupture of the rib.

[0041] In a second aspect, the present application proposes an electrical device, which includes any one of the above-mentioned battery devices.

[0042] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0044] Figure 1 is a structural schematic diagram of a vehicle provided in one embodiment of the present application;

[0045] Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0046] Figure 3 This is a schematic structural diagram of a battery cell assembly provided in one embodiment of the present application;

[0047] Figure 4 This is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application;

[0048] Figure 5 This is a schematic diagram of the bottom structure of a battery device provided in one embodiment of the present application;

[0049] Figure 6 yes Figure 5 Schematic diagram of the exploded structure of the battery device;

[0050] Figure 7 yes Figure 5 AA cross-sectional structural diagram of the battery device;

[0051] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of part B;

[0052] Figure 9 yes Figure 5 Schematic diagram of the internal structure of the box;

[0053] Figure 10 yes Figure 9 A schematic diagram of the relative position structure of the box body and the insulating member;

[0054] Figure 11 yes Figure 10 Schematic diagram of the enlarged structure of part C;

[0055] Figure 12 is a schematic diagram of the exploded structure of a battery device according to another embodiment of the present application;

[0056] Figure 13 is a schematic diagram of the exploded structure of a battery device according to another embodiment of the present application;

[0057] Figure 14 is a schematic diagram of the exploded structure of a battery device according to another embodiment of the present application;

[0058] Figure 15 is a schematic diagram of the bottom structure of a battery device according to another embodiment of the present application;

[0059] Figure 16 yes Figure 15 DD cross-sectional structural diagram of the battery device;

[0060] Figure 17 yes Figure 16 Schematic diagram of the enlarged structure of part E in .

[0061] The accompanying drawings in the specific implementation manner are as follows:

[0062] 1. Vehicle;

[0063] 10. Battery device; 11. Controller; 12. Motor;

[0064] 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;

[0065] 30. Box body; 301. First portion; 302. Second portion; 31. Box body; 32. Bottom plate assembly; 321. First plate; 3211. First rib; 3212. First raised portion; 3213. Second raised portion; 322. Second plate; 3221. Second rib; 3222. Through hole; 3223. Recessed portion; 3224. Buffer; 323. Buffer cavity; 40. Insulator;

[0066] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0067] The following embodiments of the technical solution of the present application are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0068] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of this application should have the common meanings understood by technicians in the field to which the embodiments of this application belong.

[0069] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0070] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the quantity of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" includes two or more, unless otherwise specifically defined.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0072] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0073] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. Lithium-ion batteries, due to their high energy density, high average open-circuit voltage, and long cycle life, are widely used in mobile and portable appliances.

[0074] The battery device is an important power source for electric vehicles. When electric vehicles are driving, the splash of gravel, sand, etc. on the road will cause impact on the bottom of the battery device, causing the bottom of the battery device to deform and squeeze the battery cells inside the battery device, thereby causing deformation and damage to the battery cells, and even fire.

[0075] In view of the defects of 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 of battery cells being squeezed and deformed due to impact on the bottom of the battery device.

[0076] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0077] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

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

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

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

[0081] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0082] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0083] 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 crossbeam and longitudinal beam of the vehicle.

[0084] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0085] In some embodiments, an energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery modules connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0086] 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. Energy storage devices can store electrical energy as needed and output it at the appropriate time. For example, an energy storage device can store electrical energy during periods of low electricity consumption and provide it to relevant users or electrical equipment during periods of peak electricity consumption. The energy storage system provided in the embodiments of the present application can be any power system that requires an energy storage device.

[0087] The technical solutions described in the embodiments of the present application are applicable to various electrical devices and energy storage devices that use battery cells and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships, spacecraft and energy storage containers, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0088] Figure 1 This is a schematic diagram of the structure of the vehicle 1 provided in some embodiments of the present application. Figure 1 As shown, 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. A battery device 10 is disposed within vehicle 1. Battery device 10 can be located at the bottom, front, or rear of vehicle 1. Battery device 10 can be used to power vehicle 1. For example, battery device 10 can serve as an operating power source for vehicle 1. Vehicle 1 can also include a controller 11 and a motor 12. Controller 11 is used to control battery device 10 to power motor 12, for example, to meet the power requirements of vehicle 1 during startup, navigation, and driving.

[0089] In some embodiments of the present application, the battery device 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0090] Figure 2 FIG. 1 is a schematic structural diagram of a battery device 10 according to an embodiment of the present application. Figure 3 This is a schematic structural diagram of a battery cell assembly 20 according to an embodiment of the present application. Figure 2 and Figure 3 As shown, to meet different power requirements, the battery device 10 may include multiple battery cells 21. A battery cell 21 is the smallest unit that makes up the battery device 10. Multiple battery cells 21 can be connected in series and / or in parallel via electrode terminals for various applications. Multiple battery cells 21 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a combination of series and parallel connections.

[0091] Combine Figure 2 and Figure 3 As shown, the battery device 10 may include multiple battery cell assemblies 20 and a housing 30, wherein the multiple battery cell assemblies 20 are housed within the housing 30. The housing 30 is used to house the battery cells 21 or the battery cell assemblies 20 to reduce the impact of liquids or other foreign matter on the charging or discharging of the battery cells 21. The housing 30 may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepipeds, cylinders, or spheres. The housing 30 may be made of an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0092] In some embodiments, the housing 30 may include a first portion 301 and a second portion 302 , which overlap each other and together define a space for accommodating the battery cells 21 . The second portion 302 may be a hollow structure with one end open, and the first portion 301 may be a plate-like structure, overlapping the open side of the second portion 302 , so that the first portion 301 and the second portion 302 together define a space for accommodating the battery cells 21 . The first portion 301 and the second portion 302 may also each be a hollow structure with one end open, with the open side of the first portion 301 overlapping the open side of the second portion 302 .

[0093] The battery cell assembly 20 may include multiple battery cells 21. Multiple battery cells 21 may be connected in series, in parallel, or in a mixed manner to form the battery cell assembly 20, and multiple battery cell assemblies 20 may then be connected in series, in parallel, or in a mixed manner to form the battery device 10. The battery cell 21 may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of the present application are not limited to this. Battery cells 21 are generally divided into three types according to the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of the present application are not limited to this. However, for the sake of simplicity, the following embodiments are all described using a prismatic lithium-ion battery cell 21 as an example.

[0094] Figure 4 The figure is a schematic diagram of the exploded structure of the battery cell 21 provided in some embodiments of the present application. The battery cell 21 refers to the smallest unit that constitutes the battery device 10. Figure 4 The battery cell 21 includes an end cover 211 , a shell 212 and an electrode assembly 213 .

[0095] The end cap 211 refers to a component that covers the opening of the shell 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 shell 212 to match the shell 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 less likely to deform when squeezed or collided, so that the battery cell 21 can 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 terminal 214 can be used to electrically connect to the electrode assembly 213 for outputting or inputting electrical energy from the battery cell 21. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. In some embodiments, an insulating member may be provided inside the end cap 211 to isolate the electrical connection components in the housing 212 from the end cap 211 to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, or the like.

[0096] The housing 212 is a component that cooperates with the end cap 211 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte (not shown), and other components. The housing 212 and the end cap 211 can be separate components. An opening can be provided in the housing 212, and the end cap 211 can be placed over the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 211 and the housing 212 can be integrated. Specifically, the end cap 211 and the housing 212 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 212 is to be enclosed, the end cap 211 is placed over the housing 212. The housing 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 212 can be determined based on the specific shape and size of the electrode assembly 213. The housing 212 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0097] The electrode assembly 213 is a component in the battery cell 21 where electrochemical reactions occur. One or more electrode assemblies 213 may be contained in the housing 212. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 213, and the parts of the positive and negative electrode sheets without active materials each constitute a tab (not shown in the figure). The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals 214 to form a current loop.

[0098] Combine Figure 2 、 Figures 4 to 8As shown, in some embodiments of the present application, the battery device 10 includes a case 30 and a plurality of battery cells 21. The case 30 includes a case body 31 and a bottom plate assembly 32. A receiving cavity is formed inside the case body 31. At least one end of the case body 31 along a first direction X is provided with an opening. The bottom plate assembly 32 is provided at the opening at one end of the case body 31 along the first direction X. The plurality of battery cells 21 are provided inside the receiving cavity. An assembly gap is formed between two adjacent battery cells 21. The bottom plate assembly 32 includes a first plate 321 and a second plate 322 arranged opposite to each other along the first direction X. The second plate 322 is provided on a side of the first plate 321 facing the battery cells 21 and forms a buffer cavity 323 between the second plate 321 and the first plate 321. At least one of the first plate 321 and the second plate 322 is provided with a rib protruding toward the other. The extending direction of at least some of the assembly gaps is the same as the extending direction of some of the ribs. In addition, along the first direction X, the assembly gaps extending in the same direction have an overlapping area with the orthographic projection of the ribs.

[0099] Specifically, the housing 30 forms the overall exterior structure of the battery device 10. The housing 30 includes a housing body 31 and a bottom plate assembly 32. The housing body 31 is a generally annular frame structure with openings at both ends along the first direction X. The bottom plate assembly 32 is a thick, plate-like structure and is positioned at one end of the housing body 31 along the first direction X. The bottom plate assembly 32 is connected to the housing body 31 and serves to seal the opening at one end. The other end of the housing body 31 along the first direction X is open, allowing the battery cells 21 to be placed within the accommodating cavity through the opening at the end of the housing body 31 along the first direction X, facing away from the bottom plate assembly 32. The box body 31 and the bottom plate assembly 32 together constitute the second portion 302 of the box body 30. The box body 30 also includes a first portion 301. The first portion 301 can be a hollow structure with one end open, and covers the opening at the other end of the box body 31 away from the bottom plate assembly 32. Alternatively, the first portion 301 can be a plate-like structure, and covers the opening at the other end of the box body 31 away from the bottom plate assembly 32. Optionally, when the battery device 10 is installed on the bottom of the vehicle, the first direction X can be a vertical direction, and the bottom plate assembly 32 can be arranged vertically at the bottom of the box body 31 and also at the bottom of the battery cell 21. When the vehicle is running over, stones or gravel flying from the bottom of the vehicle can strike the bottom of the battery device 10, that is, the side of the bottom plate assembly 32 away from the battery cell 21.

[0100] The base plate assembly 32 includes a first plate 321 and a second plate 322 arranged opposite each other along a first direction X. The second plate 322 is located on the side of the first plate 321 facing the battery cells 21, that is, the first plate 321 is located on the side of the base plate assembly 32 facing away from the battery cells 21. This allows flying stones or gravel to strike the first plate 321. At least a portion of the second plate 322 is spaced apart from the first plate 321, forming a buffer cavity 323 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. This reduces the risk of the connection between the first and second plates 321 and 322 being located below the battery cells 21. Because the connection is typically in a close-fitting state, without a buffer cavity between them, placing the connection directly below the battery cells 21 can easily compress the battery cells 21 when deformed by impact, potentially causing deformation and damage. By forming a buffer cavity 323 between the first plate 321 and the second plate 322, when the first plate 321 is impacted, a portion of the first plate 321 bends and deforms toward the buffer cavity 323, preventing it from directly contacting the second plate 322. This reduces the impact on the second plate 322 and the battery cell 21. At least one of the first plate 321 and the second plate 322 is provided with ribs protruding toward the other, and at least a portion of the assembly gap extends in the same direction as the ribs, with their orthographic projections along the first direction X overlapping. Optionally, the ribs may be provided only on the surface of the first plate 321 facing the second plate 322; or only on the surface of the second plate 322 facing the first plate 321; or, the ribs may be provided on the surface of the first plate 321 facing the second plate 322, while the ribs may be provided on the surface of the second plate 322 facing the first plate 321. 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.

[0101] For the convenience of description, this application only takes the example of the first plate body 321 having the first rib 3211 on the surface facing the second plate body 322 as an example for explanation.

[0102] According to the battery device 10 of the present application, a buffer cavity 323 is provided between the first plate 321 and the second plate 322. When the first plate 321 is deformed by an impact, the buffer cavity 323 can reduce the impact of the deformed first plate 321 on the second plate 322, thereby reducing the impact on the battery cell 21. At the same time, at least one of the first plate 321 and the second plate 322 is provided with a rib protruding toward the other, and at least a portion of the assembly gaps extend in the same direction as some of the ribs, and the assembly gaps extending in the same direction have an overlapping area with the orthographic projection of the ribs along the first direction X. When the first plate 321 is deformed by an impact, the impact force generated by the first plate 321 can be transmitted through the ribs to the side walls of the housing 212 of the battery cell 21 on both sides of the assembly gap, thereby reducing the impact force directly acting on the surface of the battery cell 21 along the first direction X, thereby reducing deformation and damage of the battery cell 21 under the action of the impact force.

[0103] Combine Figures 4 to 8 As shown, in some embodiments of the present application, along the first direction X, the orthographic projections of at least a portion of the assembly gaps are completely within the range of the orthographic projections of some of the ribs.

[0104] Specifically, along the first direction X, at least a portion of the assembly gaps are arranged opposite to portions of the first ribs 3211. The first ribs 3211 arranged opposite to each other along the first direction X extend in the same direction as the assembly gaps, and the dimension of the first ribs 3211 in the extension direction is greater than or equal to the dimension of the assembly gaps. Furthermore, 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 orthographic projections of the sidewalls of the housing 212 of the battery cells 21 on either side of the assembly gap along the first direction X are completely within the orthographic projections of the portions of the first ribs 3211. Optionally, the battery cells 21 are cuboidal. The sidewalls of the housing 212 of the battery cells 21 on either side of the assembly gap are arranged along the first direction X. Compared to surfaces on one side of the battery cells 21 along the first direction X, the sidewalls arranged along the first direction X have better resistance to deformation under impact forces in the first direction X. This allows the impact forces to be applied to the sidewalls of the housing 212 on either side of the assembly gap, thereby reducing deformation of the battery cells 21.

[0105] By setting the orthographic projection of the assembly gap completely within the range of the orthographic projection of some convex ribs, that is, the orthographic projections of the side walls of the shell 212 of the battery cell 21 on both sides of the assembly gap along the first direction X are completely within the range of the orthographic projection of some convex ribs, the range and effect of the impact force transmitted to the side walls of the shell 212 of the battery cell 21 on both sides of the assembly gap are improved, thereby reducing deformation and damage of the battery cell 21.

[0106] Combine 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, and 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, and the rib includes a first protrusion 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 protrusion 3212 have an overlapping area, wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0107] Specifically, the assembly gap includes a first assembly gap 22, which is provided 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 protrusions 3212, which are spaced apart along the second direction Y, and each of the first protrusions 3212 extends along the third direction Z. The plurality of first protrusions 3212 are provided in a one-to-one correspondence with the plurality of first assembly gaps 22 along the first direction X, and along the first direction X, the orthographic projection of the first assembly gap 22 overlaps with the orthographic projection of the first protrusion 3212. Optionally, when the battery device 10 is installed on the bottom of the vehicle, the first direction X can be a vertical direction, the second direction Y can be one of the length and width directions of the battery device 10, and the third direction Z can be the other of the length and width directions of the battery device.

[0108] By extending the first assembly gap 22 and the first protrusion 3212 along the third direction Z respectively, and making the orthographic projection of the first assembly gap 22 and the orthographic projection of the first protrusion 3212 have an overlapping area, when the first plate 321 is deformed by impact, the impact force generated by the first plate 321 can be transmitted to the side walls of the shell 212 of the battery cell 21 on both sides of the first assembly gap 22 through the first protrusion 3212, thereby reducing deformation and damage to the battery cell 21.

[0109] Combine 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 protrusion 3212 .

[0110] Specifically, along the first direction Z, the first assembly gap 22 is arranged opposite to the first protrusion 3212, and the size of the first protrusion 3212 along the second direction Y is greater than or equal to the size of the first assembly gap 22 along the second direction Y, and the size of the first protrusion 3212 along the third direction Z is greater than or equal to the size of the first assembly gap 22 along the third direction Z, so that the orthographic projections of the side walls of the shell 212 of the battery cell 21 on both sides of the first assembly gap 22 along the first direction X are completely within the range of the orthographic projection of part of the first protrusion 3212.

[0111] By setting the orthographic projection of the first assembly gap 22 completely within the range of the orthographic projection of the first protrusion 3212, that is, the orthographic projections of the side walls of the shell 212 of the battery cell 21 on both sides of the first assembly gap 22 along the first direction X are completely within the range of the orthographic projection of the first protrusion 3212, the range and effect of the impact force transmitted to the side walls of the shell 212 of the battery cell 21 on both sides of the first assembly gap 22 are improved, thereby reducing deformation and damage of the battery cell 21.

[0112] Combine Figures 4 to 8 As shown, in some embodiments of the present application, the assembly gap also includes a second assembly gap (not shown in the figure), the battery device 10 includes a plurality of battery cell assemblies 20, and the plurality of battery cell assemblies 20 are arranged along the third direction Z. Any battery cell assembly 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, and the second assembly gap extends along the second direction Y. The rib also includes a second protrusion 3213 extending along the second direction Y. Along the first direction X, the orthographic projection of the second assembly gap and the orthographic projection of the second protrusion 3213 have an overlapping area.

[0113] Specifically, the assembly gap also includes a second assembly gap, which is provided between two adjacent battery cell assemblies 20 along the third direction Z and extends along the second direction Y. The first rib 3211 also includes a plurality of second protrusions 3213, which are spaced apart along the third direction Z, with each second protrusion 3213 extending along the second direction Y. The plurality of second protrusions 3213 correspond to the plurality of second assembly gaps along the first direction X, and the orthographic projections of the second assembly gaps and the orthographic projections of the second protrusions 3213 along the first direction X overlap.

[0114] By extending the second assembly gap and the second protrusion 3213 along the second direction Y, and ensuring that the orthographic projection of the second assembly gap overlaps with the orthographic projection of the second protrusion 3213, when the first plate 321 is deformed by an impact, the impact force generated by the first plate 321 can be transmitted through the second protrusion 3213 to the sidewalls of the housing 212 of the battery cells 21 on both sides of the second assembly gap, thereby reducing deformation and damage to the battery cells 21. Furthermore, by providing the first and second protrusions 3212 and 3213 simultaneously, with the first and second protrusions 3212 and 3213 extending in intersecting directions to form a grid structure, when an impact occurs at a location within the grid structure, the impact force can be transmitted through the grid structure to other nearby ribs, and then through the ribs to the sidewalls of the housing 212 of the battery cells 21 on both sides of the corresponding assembly gap along the first direction X, thereby dispersing the impact force and reducing deformation and damage to the battery cells 21.

[0115] Combine 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 .

[0116] Specifically, along the first direction X, the second assembly gap is arranged opposite to the second protrusion 3213, and the size of the second protrusion 3213 along the second direction Y is greater than or equal to the size of the second assembly gap along the second direction, and the size of the second protrusion 3213 along the third direction Z is greater than or equal to the size of the second assembly gap along the third direction Z, so that the orthographic projections of the side walls of the shell 212 of the battery cell 21 on both sides of the second assembly gap along the first direction X are completely within the range of the orthographic projection of part of the second protrusion 3213.

[0117] By setting 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 projections of the side walls of the shell 212 of the battery cell 21 on both sides of the second assembly gap along the first direction X are completely within the range of the orthographic projection of the second protrusion 3213, the range and effect of the impact force transmitted to the side walls of the shell 212 of the battery cell 21 on both sides of the second assembly gap are improved, thereby reducing deformation and damage of the battery cell 21.

[0118] Combine Figures 4 to 8 As shown, in some embodiments of the present application, the battery cell 21 includes a first surface 2121 having the largest area, and the first surface 2121 is perpendicular to the second direction Y.

[0119] Specifically, the battery cell 21 may be a prismatic battery cell, including a length direction, a width direction, and a height direction. The length and height dimensions of the battery cell 21 are respectively greater than the width dimension. Therefore, the surface of the battery cell 21 having both the length and height dimensions is the first surface 2121 of the battery cell 21 with the largest area. Optionally, the length direction of the battery cell 21 coincides with the third direction X, the width direction of the battery cell 21 coincides with the second direction Y, the height direction of the battery cell 21 coincides 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, i.e., the first surface 2121 is perpendicular to the second direction Y. Optionally, the battery cell 21 may also be a cylindrical battery cell, wherein the axial direction of the cylindrical battery cell coincides with the first direction X.

[0120] By arranging the first surface 2121 perpendicular to the second direction Y, the impact force acting on the first surface 2121 in the direction perpendicular to the first surface 2121 can be reduced, 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.

[0121] Combine Figures 5 to 8 As shown, in some embodiments of the present application, the first plate 321 is connected to the box body 31 and is used to block an opening at one end of the box body 31, and the second plate 322 is arranged inside the accommodating cavity.

[0122] Specifically, the first plate 321 is disposed at one end opening of the box body 31 and connected to the edge of the opening, thereby blocking one end of the accommodating cavity. The second plate 322 is connected to the first plate 321 and disposed inside the accommodating cavity.

[0123] By disposing the second plate 322 inside the accommodation cavity, an inner lining plate structure is formed, thereby reducing the size of the battery cell 21 along the first direction X.

[0124] Combine Figures 5 to 8 As shown, in some embodiments of the present application, the second plate body 322 includes a heat exchange plate, which is configured to exchange heat with the battery cell 21.

[0125] Specifically, a heat exchange channel is formed inside the heat exchange plate, and the heat exchange channel is used to circulate the heat exchange medium. The heat exchange medium can adjust the temperature of the heat exchange plate during the flow in the heat exchange channel, and the heat exchange plate then exchanges heat with the battery cell 21, thereby adjusting the temperature of the battery cell 21. Optionally, the heat exchange plate can be a flat plate structure, and a cavity is provided inside it to form a heat exchange channel. Alternatively, a protruding channel groove is formed on the side of the heat exchange plate away from the battery cell 21, and a heat exchange channel is formed in the channel groove. Among them, the channel groove can be equivalent to the rib in the present application, and the channel groove has the same extension direction as the partial assembly gap and is relatively arranged along the first direction X.

[0126] By configuring the second plate 322 as a heat exchange plate, the heat exchange plate can exchange heat with the battery cells 21 , thereby adjusting the temperature of the battery cells 21 and further improving the performance of the battery device 10 .

[0127] Combine Figures 5 to 11 As shown, in some embodiments of the present application, the second plate 322 is penetrated by a through hole 3222 for circulating the electrophoretic liquid, and the through hole 3222 is connected to the buffer cavity 323 .

[0128] Specifically, if the first plate 321 or the second plate 322 requires corrosion protection, an electrophoresis process can be added after the base plate assembly 32 is assembled with the box body 31. Since the first plate 321 is connected to the box body 31, and the second plate 322 is positioned within the accommodating cavity, the through-holes 3222 provided in the second plate 322 allow the electrophoretic fluid to enter the buffer cavity 323 between the first and second plates 321, 322. This allows electrophoresis to be performed on the opposing surfaces of the first and second plates 321, 322, forming an electrophoretic protective layer. Furthermore, the through-holes 3222 provided in the second plate 322 do not compromise the sealing performance of the box body 30.

[0129] By setting a through hole 3222 on the second plate body 322 that is connected to the buffer cavity 323, the electrophoretic liquid can flow into or out of the interior 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 electrophoretic 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, thereby improving the corrosion resistance of the bottom plate assembly 32.

[0130] Combine Figures 5 to 11 As shown, in some embodiments of the present application, 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 sandwiched between the battery cell 21 and the second plate 322 and covers the through hole 3222 .

[0131] Specifically, to reduce 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 positioned opposite the through-hole 3222 along the first direction X. When the battery cell 21 is assembled within the accommodating cavity, the insulating member 40 is sandwiched between the battery cell 21 and the second plate 322, covering the through-hole 3222. Alternatively, the insulating member 40 can be a foam strip and extend along the second direction Y.

[0132] By sandwiching the insulating member 40 between the battery cell 21 and the second plate 322 and covering the through hole 3222 , particles in the box 30 can be reduced from falling into the buffer cavity 323 through the through hole 3222 , thereby reducing the noise generated by particles hitting the inner wall of the buffer cavity 323 .

[0133] like Figure 12 As shown, in some embodiments of the present application, the second plate 322 is connected to the box body 31 and is used to block an opening at one end of the box body 31, and the first plate 321 is arranged outside the accommodating cavity.

[0134] Specifically, the second plate 322 is disposed at one end opening of the box body 31 and connected to the edge of the opening, thereby blocking one end of the accommodating cavity. The first plate 321 is connected to the second plate 322 and is disposed outside the accommodating cavity.

[0135] By arranging the first plate 321 outside the accommodating cavity, an outer protective plate structure is formed, thereby increasing the size of the accommodating cavity along the first direction X, increasing the size of the battery cell 21 , and increasing the power of the battery device 10 .

[0136] Combine Figures 4 to 8 as well as Figure 12 As shown, in some embodiments of the present application, the rib includes a first rib 3211, and the first plate body 321 is provided with a first rib 3211 protruding from one side of the first plate body 322 toward the second plate body 322. The extension direction of at least part of the assembly gap is the same as the extension direction of at least part of the first rib 3211, and the positive projection along the first direction X has an overlapping area.

[0137] Specifically, the rib structure is provided only on the first plate 321, and the second plate 322 may be a shaped structure. The first rib 3211 may include a plurality of first protrusions 3212 extending along the third direction Z, the plurality of first protrusions 3212 being spaced apart along the second direction Y, the assembly gaps including a plurality of first assembly gaps 22 spaced apart along the second direction Y, and the plurality of first protrusions 3212 corresponding to the plurality of first assembly gaps 22 along the first direction X. Thus, the impact force is transmitted to the sidewalls of the housing 212 of the battery cell 21 on both sides of the first assembly gaps 22 via the first protrusions 3212. The first rib 3211 also includes a plurality of second protrusions 3213 extending respectively along the second direction Y, and the plurality of second protrusions 3213 are arranged at intervals along the third direction Z. The assembly gap also includes 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 a one-to-one correspondence along the first direction Z, so that the impact force is transmitted to the side walls of the shell 212 of the battery cell 21 on both sides of the second assembly gap through the second protrusions 3213.

[0138] By providing the first rib 3211 on the first plate 321, when the first plate 321 is deformed by impact, the impact force generated by the first plate 321 can be transmitted to the side walls of the shell 212 of the battery cell 21 on both sides of the assembly gap through at least a portion of the first rib 3211, thereby reducing deformation and damage to the battery cell 21.

[0139] Combine Figures 13 to 17 As shown, in some embodiments of the present application, the convex rib includes a first convex rib 3211 and a second convex rib 3221, the first plate body 321 protrudes from one side of the second plate body 322 and is provided with a first convex rib 3211, the second plate body 322 protrudes from one side of the first plate body 321 and is provided with a second convex rib 3221, the extension direction of at least part of the assembly gap, the extension direction of at least part of the first convex rib 3211 and the extension direction of at least part of the second convex rib 3221 are the same, and the orthographic projection along the first direction X has an overlapping area.

[0140] 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 each include only the first protrusion 3212; or, the first rib 3211 and the second rib 3221 may each include only the second protrusion 3213; or, the first rib 3211 and the second rib 3221 may each include both the first protrusion 3212 and the second protrusion 3213.

[0141] By providing a first rib 3211 on the first plate 321 and a second rib 3221 on the second plate 322, when the first plate 321 is deformed by impact, the impact force generated by the first plate 321 can be transmitted in sequence to the side walls of the shell 212 of the battery cell 21 on both sides of the assembly gap through at least a portion of the first rib 3211 and at least a portion of the second rib 3221, thereby reducing deformation and damage to the battery cell 21.

[0142] Combine Figures 5 to 11 As shown, in some embodiments of the present application, a portion of the second plate 322 is recessed toward the first plate 321 to form a recessed portion 3223 , and the recessed portion 3223 is fitted and connected to the first plate 321 .

[0143] Specifically, when the dimensions of the first plate 321 and the second plate 322 are too large, to improve the connection strength between the two, a portion of the second plate 322 away from the edge is recessed toward the first plate 321 to form a recessed portion 3223. The recessed portion 3223 is fitted and connected to the first plate 321. Optionally, the recessed portion 3223 and the first plate 321 may be bonded or riveted.

[0144] By recessing a portion of the second plate 322 toward the first plate 321 to form a recessed portion 3223, and by fitting the recessed portion 3223 to the first plate 321, the connection strength between the first plate 321 and the second plate 322 can be improved. Furthermore, the recessed portion at the connection between the second plate 322 and the first plate 321 can reduce contact between the connection and the battery cells 21, thereby reducing deformation and damage to the battery cells 21 caused by impact forces.

[0145] Combine 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 a side of the recessed portion 3223 facing the battery cell 21 .

[0146] Specifically, the buffer 3224 is provided on the side of the recessed portion 3223 facing the battery cell 21 and can be placed in the pit formed by the recessed portion 3223, thereby reducing the possibility of the buffer 3224 falling off or shifting. Optionally, the buffer 3224 can be a rubber pad or a foam pad.

[0147] By disposing the 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 322 on the battery cell 21 , thereby reducing deformation and damage of the battery cell 21 .

[0148] Combine Figures 4 to 8 As shown, in some embodiments of the present application, the end surface of the rib along the first direction X is an arc surface.

[0149] Specifically, taking the first protrusion 3212 provided on the first plate 321 as an example, the end surface of the first protrusion 3212 facing the second plate 322 is an arc surface, and the circular diameter corresponding to the arc surface must be larger than the dimension of the first assembly gap 22 along the second direction Y. Therefore, when the first protrusion 3212 squeezes the second plate 322 and the battery cell 21, the impact force can be transmitted through the first protrusion 3212 to the sidewalls of the housing 212 of the battery cell 21 on both sides of the first assembly gap 22. Optionally, the circular diameter corresponding to the arc surface ranges from 1.0 mm to 15 mm.

[0150] By setting the end surface of the rib along the first direction X as an arc surface, the stress concentration caused by the rib being squeezed under the action of impact force can be reduced, thereby reducing the deformation and rupture of the rib.

[0151] Figure 1 As shown, the second aspect of the present application provides an electrical device, which includes any one of the battery devices 10 described above.

[0152] Since the electrical equipment 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 described in detail here.

[0153] like Figure 1 As shown, in some embodiments of the present application, the electrical device may be a vehicle 1, which includes a battery device 10 according to any of the above embodiments. The battery device 10 is used to provide electrical energy to the vehicle 1 and to drive the vehicle 1 to move.

[0154] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0155] Combine Figure 2 、 Figures 4 to 11As shown, in some embodiments of the present application, the battery device includes a case 30 and multiple battery cells 21. The case 30 includes a case body 31 and a bottom plate assembly 32. The case body 31 has an interior formed with an accommodating cavity. The case body 31 has openings at both ends along a first direction X. The bottom plate assembly 32 is provided at the opening at one end of the case body 31 along the first direction X. The multiple battery cells 21 are disposed within the accommodating cavity, with an assembly gap formed between 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 321. The first plate body 321 is provided with a first rib 3211 protruding toward the second plate body 322. The extension direction of at least a part of the assembly gaps is the same as the extension direction of part of the first rib 3211, and along the first direction, the orthographic projection of at least a part of the assembly gaps is completely within the range of the orthographic projection of part of the first rib 3211.

[0156] 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 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 protrusion 3212 extending along the third direction Z. The orthographic projection of the first assembly gap 22 along the first direction X is completely within the orthographic projection of the first protrusion 3212. The assembly gap also includes a second assembly gap. The battery device 10 includes a plurality of battery cell assemblies 20 arranged along the third direction Z. Each battery cell assembly 20 includes a portion of the 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 first rib 3211 also includes a second protrusion 3213 extending along the second direction Y. The orthographic projection of the second assembly gap along the first direction X is completely within the orthographic projection of the second protrusion 3213.

[0157] Among them, the first plate 321 is connected to the box body 31 and is used to block the opening at one end of the box body 31. The second plate 322 is arranged inside the accommodating cavity. The second plate 322 is penetrated by a through hole 3222 for circulating the electrophoretic liquid, and the through hole 3222 is connected to the buffer cavity 323. The battery cell 21 is provided with an insulating member 40 on the side facing the bottom plate assembly 32 along the first direction X. The insulating member 40 is sandwiched between the battery cell 21 and the second plate 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 portion of the second plate 322 is recessed toward the first plate 321 to form a recessed portion 3223, and the recessed portion 3223 is bonded to the first plate 321. The bottom plate assembly 32 also includes a buffer 3224, which is provided on the side of the recessed portion 3223 facing the battery cell 21. An end surface of the first rib 3211 along the first direction X is an arc surface.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, the box body comprising a box body and a bottom plate assembly, the box body having an accommodating cavity formed therein, the box body having an opening at at least one end thereof along a first direction, and the bottom plate assembly being provided at the opening at one end of the box body along the first direction; A plurality of battery cells are arranged inside the accommodating cavity, and an assembly gap is formed between two adjacent battery cells; In which, 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 convex rib protruding toward the other, the extension direction of at least part of the assembly gaps is the same as the extension direction of part of the convex ribs, and along the first direction, the assembly gaps with the same extension direction have an overlapping area with the orthographic projection of the convex ribs, when the first plate body is deformed by impact, the impact force generated by the first plate body can be transmitted to the side walls of the shell of the battery cell on both sides of the assembly gap through the convex ribs.

2. The battery device according to claim 1, wherein: Along the first direction, orthographic projections of at least some of the assembly gaps are completely within the range of orthographic projections of some of the ribs.

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

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 protrusion.

5. The battery device according to claim 3, wherein: The assembly gap also includes a second assembly gap, the battery device includes a plurality of battery cell assemblies, and the plurality of battery cell assemblies are arranged along the third direction. Any of the battery cell assemblies includes a partial number of the battery cells arranged along the second direction. The second assembly gap is formed between adjacent battery cell assemblies, and the second assembly gap extends along the second direction. The rib also includes a second protrusion extending along the second direction. Along the first direction, the orthographic projection of the second assembly gap and the orthographic projection of the second protrusion 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 protrusion.

7. The battery device according to claim 5, characterized in that The battery cell includes a first surface with a 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 is connected to the box body and is used to block an opening at one end of the box body. The second plate is arranged inside the accommodating cavity.

9. The battery device according to claim 8, characterized in that The second plate body includes a heat exchange plate configured to exchange heat with the battery cells.

10. The battery device according to claim 8, characterized in that The second plate body is penetrated by a through hole for circulating the electrophoretic liquid, and the through hole is 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 sandwiched 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 is connected to the box body and is used to block an opening at one end of the box body. The first plate is arranged outside the accommodating cavity.

13. The battery device according to any one of claims 1 to 7, characterized in that The convex rib includes a first convex rib, and the first plate body is protruding toward the side of the second plate body and is provided with the first convex rib. The extension direction of at least part of the assembly gaps is the same as the extension direction of at least part of the first convex rib, and the orthographic projection along the first direction has an overlapping area.

14. The battery device according to any one of claims 1 to 7, characterized in that The convex rib includes a first convex rib and a second convex rib, the first plate body is protruding from one side of the second plate body and is provided with the first convex rib, the second plate body is protruding from one side of the first plate body and is provided with the second convex rib, the extension direction of at least part of the assembly gaps, the extension direction of at least part of the first convex ribs and the extension direction of at least part of the second convex ribs are the same, and the orthographic projections along the first direction have an overlapping area.

15. The battery device according to any one of claims 1 to 7, characterized in that A portion of the second plate body is recessed toward the first plate body to form a recessed portion, and the recessed portion is in close contact 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, which is disposed on a 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 surface of the rib along the first direction is an arc surface.

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

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