Battery device and electric equipment

Abstract

The invention relates to the technical field of batteries, in particular to a battery device and electric equipment. The battery device comprises a box body, a bottom protection plate assembly and a plurality of single batteries, a containing cavity is formed in the box body, the single batteries are arranged in the containing cavity, the bottom protection plate assembly is arranged on one side of the single batteries in the first direction, and a containing groove is formed in the surface, facing the single batteries, of the bottom protection plate assembly; the accommodating groove comprises at least one first groove section; the single batteries are attached to the bottom protection plate assembly in the first direction and are configured to seal at least part of the containing grooves in the containing cavity, and a first pressure relief mechanism is arranged on the side, facing the bottom protection plate assembly in the first direction, of each single battery. And the projections of the first pressure relief mechanisms of the at least two battery monomers along the first direction are respectively positioned in the projection range of the same first groove section along the first direction. According to the battery device provided by the invention, the electric connection between the battery monomers and the bottom protection plate guide assembly through the stacked mixture can be reduced, and the reliability of the battery device is improved.

Description

Technical Field

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

[0002] A battery device generally consists of multiple battery cells. To improve the energy density of the battery device, the battery cells in the battery device are arranged very closely, so that heat in the battery device is likely to accumulate. When the heat in the battery device accumulates to a certain extent, thermal runaway of the battery cells may be triggered.

[0003] When thermal runaway occurs in a battery cell, the explosion-proof valve at the bottom of the battery cell opens, and the high-temperature, high-pressure gas-liquid-solid mixture will be discharged through the explosion-proof valve and accumulate on the bottom protection plate, damaging the insulating paint on the bottom protection plate and causing the insulation of the bottom protection plate to fail. When the accumulated material reaches a certain extent, the thermally runaway battery cell can be electrically connected to the bottom protection plate through the accumulated material, thus causing accidents such as fire or explosion, posing a serious threat to the life and property safety of users. Summary of the Invention

[0004] In view of the defects existing in the prior art, the purpose of this application is to provide a battery device and an electrical device, which can effectively solve the problem of electrical connection between a thermally runaway battery cell and the bottom protection plate.

[0005] In a first aspect, this application provides a battery device, which includes: A box body, an accommodation cavity is formed inside the box body; Multiple battery cells, the multiple battery cells are arranged in the accommodation cavity; A bottom protection plate assembly, the bottom protection plate assembly is arranged on one side of the multiple battery cells along a first direction, and a receiving groove is provided on the surface of the bottom protection plate assembly facing the battery cells, and the receiving groove includes at least one first groove section; Wherein, the battery cells are attached to the bottom protection plate assembly along the first direction and are configured to seal at least part of the receiving groove in the accommodation cavity. A first pressure relief mechanism is provided on one side of each battery cell facing the bottom protection plate assembly along the first direction, and the projections of the first pressure relief mechanisms of at least two battery cells along the first direction are respectively within the projection range of the same first groove section along the first direction.

[0006] For the battery device according to the present application, by making the projections of the first pressure relief mechanisms of at least some of the battery cells in the first direction respectively fall within the projection range of the same first groove section in the first direction, when a battery cell undergoes thermal runaway, the battery cell discharges the high-temperature and high-pressure mixture towards the first groove section through the first pressure relief mechanism. Since the first groove section is arranged corresponding to the first pressure relief mechanisms of at least two battery cells in the first direction, there is sufficient space in the first groove section to accommodate the mixture, thereby reducing the accumulation of the mixture, and further reducing the conductive connection between the battery cell and the bottom protection plate assembly through the accumulated mixture, improving the reliability of the battery device. At the same time, by at least partially accommodating the grooves in the sealed accommodation cavity of the battery cell, the high-temperature and high-pressure gas in the mixture can flow into the accommodation groove as much as possible, thereby reducing the damage to other electrical components in the accommodation cavity caused by the high-temperature and high-pressure gas.

[0007] In some embodiments of the present application, the bottom protection plate assembly is further provided with a second pressure relief mechanism. Part of the bottom protection plate assembly extends out of the accommodation cavity and is provided with part of the accommodation groove. The second pressure relief mechanism is arranged outside the accommodation cavity and is configured to relieve the pressure of the accommodation groove when the pressure in the accommodation groove is greater than a preset value.

[0008] By arranging the second pressure relief mechanism outside the accommodation cavity, when the high-temperature and high-pressure gas discharged by the thermally runaway battery cell is excessive, resulting in the pressure in the accommodation groove being greater than the preset value, the second pressure relief mechanism is opened and communicates the accommodation groove with the outside of the box body, thereby discharging the high-temperature and high-pressure gas in the mixture and reducing the further damage to the battery cell and the battery device caused by the excessive pressure in the accommodation groove.

[0009] In some embodiments of the present application, the bottom protection plate assembly includes a bottom protection plate and a sealing plate. The bottom protection plate is recessed towards the direction away from the battery cell to form an accommodation groove. The sealing plate is arranged on the side of the bottom protection plate facing the battery cell and is attached to the bottom protection plate. At least part of the sealing plate is arranged outside the accommodation cavity and is configured to seal the accommodation groove outside the accommodation cavity.

[0010] By arranging the sealing plate outside the accommodation cavity, the sealing plate can cooperate with the bottom protection plate arranged outside the accommodation cavity to seal the accommodation groove outside the accommodation cavity, reducing the leakage of the high-temperature and high-pressure gas in the accommodation groove, so that the high-temperature and high-pressure gas can only be discharged to the outside of the box body through the second pressure relief mechanism.

[0011] In some embodiments of the present application, part of the sealing plate extends into the accommodation cavity and is configured to cooperate with the battery cell to jointly seal the accommodation groove in the accommodation cavity.

[0012] By inserting a part of the sealing plate into the interior of the accommodation cavity and cooperating with the battery cell to jointly seal the accommodation groove in the accommodation cavity, the high-temperature and high-pressure gas in the mixture can only flow into the accommodation groove, thereby reducing the diffusion of the high-temperature and high-pressure gas in the accommodation cavity and preventing damage to other electrical components in the accommodation cavity.

[0013] In some embodiments of the present application, the bottom protection plate assembly further includes an insulating layer, and the insulating layer is disposed in the first groove section.

[0014] By disposing the insulating layer in the first groove section, the insulating layer can reduce the conductive connection between the battery cell and the bottom protection plate through the stacked mixture.

[0015] In some embodiments of the present application, the melting point of the insulating layer is greater than or equal to 400 °C.

[0016] The temperature of the mixture discharged by the thermally out-of-control battery cell is generally lower than 400 °C. By setting the melting point of the insulating layer to be greater than or equal to 400 °C, the melting of the insulating layer by the mixture can be reduced, thereby reducing the conductive connection between the battery cell and the bottom protection plate through the stacked mixture.

[0017] In some embodiments of the present application, the insulating layer includes at least one of a PI film layer, an alumina ceramic layer, and a mica layer.

[0018] The PI film layer, the alumina ceramic layer, and the mica layer all have good insulation properties and melting points greater than 400 °C, thereby reducing the conductive connection between the battery cell and the bottom protection plate through the stacked mixture.

[0019] In some embodiments of the present application, the first groove section extends in the second direction, the first groove section has a cross-section perpendicular to the second direction, and the size of the cross-section gradually decreases in the direction away from the battery cell, and the first direction and the second direction intersect.

[0020] By setting the cross-section to gradually decrease in the direction away from the battery cell, it is convenient to collect the mixture and retain the collected mixture at the bottom of the first groove section, reducing the accumulation of the mixture along the first direction and abutting against the battery cell, and reducing damage to the battery cell.

[0021] In some embodiments of the present application, the cross-section is a trapezoidal surface.

[0022] By setting the cross-section of the first groove section as a trapezoidal surface and the size of the trapezoidal surface gradually decreasing in the direction away from the battery cell, it is convenient to collect the mixture and retain the collected mixture at the bottom of the first groove section, reducing the accumulation of the mixture along the first direction and abutting against the battery cell, and reducing damage to the battery cell.

[0023] In some embodiments of the present application, along the first direction, the size of the first groove section is greater than or equal to 15 mm and less than or equal to 30 mm.

[0024] By setting the size of the first groove section along the first direction to any value between 15 mm and 30 mm, the capacity of the first groove section can be increased, so as to accommodate more mixtures, reduce the contact between the stacked mixtures and the battery cells, and prevent damage to the battery cells.

[0025] In some embodiments of the present application, a plurality of battery cells form a multi-column battery cell assembly arranged along the third direction. Any column of the battery cell assembly includes a plurality of battery cells arranged along the second direction. The receiving groove includes a plurality of first groove sections arranged at intervals along the third direction. The plurality of first groove sections are arranged in one-to-one correspondence with the multi-column battery cell assemblies along the first direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0026] By arranging the plurality of first groove sections in one-to-one correspondence with the multi-column battery cell assemblies along the first direction, the mixtures discharged by the battery cells in the multi-column battery cell assemblies can be collected respectively through the plurality of first groove sections, so as to reduce the accumulation of the mixtures, and further reduce the conductive connection between the battery cells and the bottom protection plate assembly through the stacked mixtures, thereby improving the reliability of the battery device.

[0027] In some embodiments of the present application, the receiving groove further includes a second groove section. One ends of the plurality of first groove sections along the second direction are respectively connected to the second groove section.

[0028] By connecting the plurality of first groove sections to the second groove section respectively, the high-temperature and high-pressure gases discharged by the thermally out-of-control battery cells in each column of the multi-column battery cell assemblies can be respectively introduced into the second groove section, and collected or discharged to the outside of the box body through the second groove section.

[0029] In some embodiments of the present application, at least one first groove section is respectively provided with a flow-blocking block at one end close to the second groove section along the second direction. The flow-blocking block is connected to the bottom surface of the first groove section.

[0030] By providing the flow-blocking block, the liquid or solid mixtures in the first groove section can be reduced from flowing into the second groove section through the bottom of the first groove section and causing blockage of the second groove section.

[0031] In some embodiments of the present application, the size of the flow-blocking block along the first direction is smaller than the size of the first groove section.

[0032] By connecting the flow-blocking block to the bottom surface of the first groove section and setting the size of the flow-blocking block along the first direction to be smaller than the size of the first groove section, the high-temperature and high-pressure gases in the first groove section can flow into the second groove section through the side of the flow-blocking block away from the bottom surface of the first groove section, and be collected or discharged to the outside of the box body through the second groove section.

[0033] In some embodiments of the present application, the battery device further comprises a heat exchange plate, which is arranged along the first direction on a side of the bottom guard plate assembly away from the battery cell, and the heat exchange plate cooperates with the battery cell for heat exchange through the bottom guard plate assembly.

[0034] By providing a heat exchange plate, the heat exchange plate can cooperate with the battery cell through the bottom guard plate assembly to exchange heat, thereby adjusting the temperature of the battery cell.

[0035] In some embodiments of the present application, the heat exchange plate includes a plurality of heat exchange tubes arranged at intervals, the heat exchange tubes are fitted to the bottom guard plate assembly, and the first groove section is arranged between two adjacent heat exchange tubes.

[0036] By fitting the heat exchange tube to the bottom guard plate assembly, the heat exchange efficiency of the heat exchange plate to the bottom guard plate assembly and the battery cell can be improved. At the same time, arranging the first groove section between two adjacent heat exchange tubes can reduce the overall size of the battery device along the first direction.

[0037] In some embodiments of the present application, the box body includes a support frame, which is arranged on a side of the bottom guard plate assembly away from the battery cell along a first direction, and the support frame is formed with at least one avoidance portion, and a projection of part of the accommodating groove along the first direction is within the projection range of the avoidance portion along the first direction.

[0038] By setting up a support frame, the support frame can support the bottom guard plate assembly and the battery cell, thereby improving the stability and reliability of the battery device. At the same time, at least one avoidance portion is formed on the support frame, and the projection of part of the accommodating groove along the first direction is within the projection range of the avoidance portion along the first direction, which can reduce the overall size of the battery device along the first direction.

[0039] In a second aspect, the present application provides an electrical device having any of the above-mentioned battery devices.

[0040] 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

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application; Figure 2 is a schematic structural view of a battery cell assembly provided by an embodiment of the present application; Figure 3 is an exploded structural view of a battery cell provided by an embodiment of the present application; Figure 4 is a schematic structural view of a battery device provided by an embodiment of the present application; Figure 5 is Figure 4 the internal structural schematic of the battery device in after removing the upper cover; Figure 6 is Figure 5 the top view of the battery device in ; Figure 7 is Figure 6 the schematic A-A sectional structure view in ; Figure 8 is Figure 7 the enlarged structural view of part B in ; Figure 9 is Figure 5 the schematic structural view of the bottom protection plate assembly in ; Figure 10 is Figure 9 the exploded structural view of the bottom protection plate assembly in ; Figure 11 is Figure 10 the enlarged structural view of part C in ; Figure 12 is Figure 4 the exploded structural view of the support frame and the bottom protection plate assembly in ; Figure 13 is a schematic structural view of an energy storage cabinet provided by an embodiment of the present application.

[0042] 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; 213. Electrode assembly; 214. Electrode terminal; 215. First pressure relief mechanism; 30. Box body; 31. Support frame; 311. Avoidance part; 32. Upper cover; 40. Bottom protection plate assembly; 41. Bottom protection plate; 411. Accommodation groove; 4111. First groove section; 4112. Second groove section; 4113. Third groove section; 412. Depression; 42. Sealing plate; 43. Second pressure relief mechanism; 44. Insulating layer; 45. Flow blocking block; 46. Weld seam; 50. Heat exchange plate; 51. Heat exchange tube; 52. First current collector; 53. Second current collector; 54. Liquid inlet end; 55. Liquid outlet end; 60. Support beam; 71. First chamber; 72. Second chamber; 2. Energy storage cabinet; X. First direction; Y. Second direction; Z. Third direction. Detailed implementation manners

[0043] The implementation manners of the technical solutions 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 solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0044] 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.

[0045] 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 positional relationship based on the orientation or positional 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.

[0046] 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 specifying the quantity of the indicated technical features. In the description of the implementation manners of the present application, the meaning of "a plurality" is including two or more, unless otherwise clearly and specifically defined.

[0047] In the description of the implementation manners of the present application, unless otherwise clearly specified and limited, the technical terms "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the implementation manners of the present application can be understood according to specific situations.

[0048] In the description of the embodiments of the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean 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 may mean that the first feature is directly above or obliquely above the second feature, or simply 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 may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0049] At present, 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 used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many 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.

[0050] A battery device generally consists of multiple battery cells. In order to improve the energy density of the battery device, the battery cells in the battery device are arranged very closely, so that the heat in the battery device is easily accumulated. When the heat in the battery device accumulates to a certain extent, it may cause thermal runaway of the battery cells.

[0051] When thermal runaway occurs in a battery cell, the explosion-proof valve at the bottom of the battery cell opens, and the high-temperature, high-pressure gas-liquid-solid mixture will be discharged through the explosion-proof valve and accumulate on the bottom guard plate, damaging the insulating paint on the bottom guard plate and causing the insulation of the bottom guard plate to fail. When the accumulated material reaches a certain extent, the thermally runaway battery cell can be conductively connected to the bottom guard plate through the accumulated material, thus causing accidents such as fires or explosions, posing a serious threat to the life and property safety of users.

[0052] To solve the problem of the conductive connection between the thermally runaway battery cell and the bottom guard plate, the present application proposes a battery device and an electrical device having the battery device. According to the battery device of the present application, the accumulation of the mixture can be reduced, thereby reducing the conductive connection between the battery cell and the bottom guard plate assembly through the accumulated mixture, and improving the reliability of the battery device.

[0053] The battery device mentioned in the embodiments of the present application may include multiple battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, and the multiple battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0054] In some embodiments, a battery cell assembly is typically formed by arranging a plurality of battery cells; as an 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 into an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0055] 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.

[0056] As an 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.

[0057] As an 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.

[0058] As an 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. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body may be a top cover or a bottom plate.

[0059] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0060] As an 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 beams and longitudinal beams of the vehicle.

[0061] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0062] 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.

[0063] 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 the use of an energy storage device.

[0064] 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. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, power tools, vehicles, ships, spacecraft, and energy storage containers, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc.

[0065] Figure 1 FIG. 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. A battery device 10 is disposed inside the vehicle 1. The battery device 10 can be disposed at the bottom, head, or tail of the vehicle 1. The battery device 10 can be used to supply power to the vehicle 1. For example, the battery device 10 can be used as the operating power source of the vehicle 1. The vehicle 1 may further 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, it is used for the working power requirements during the start-up, navigation, and driving of the vehicle 1.

[0066] 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.

[0067] Figure 2 FIG. is a schematic structural diagram of a battery cell assembly 20 according to an embodiment of the present application. As Figure 2 shown, in order to meet different power usage requirements, the battery device 10 may 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 series-parallel combination. The series-parallel combination means a combination of series and parallel connections.

[0068] The battery cell assembly 20 may include a plurality of battery cells 21. The plurality of battery cells 21 may first be connected in series, parallel, or in a combined series-parallel manner to form the battery cell assembly 20, and then the plurality of battery cell assemblies 20 are connected in series, parallel, or in a combined series-parallel manner to form the battery device 10. The battery cells 21 may be in the shape of a cylinder, a flat body, a 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 encapsulation method: cylindrical battery cells, cuboid 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 cuboid lithium-ion battery cell 21 as an example.

[0069] Figure 3 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 3 , 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 may be adapted to the shape of the housing 212 to cooperate with the housing 212. Optionally, the end cap 211 may 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 may be provided on the end cap 211. The electrode terminals 214 may be used to electrically connect to the electrode assembly 213 for outputting or inputting 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 may also be provided on the end cap 211. In some embodiments, an insulating member may also be provided on the inner side of the end cap 211, and the insulating member may 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 may be plastic, rubber, etc.

[0071] The housing 212 is a component for cooperating 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, the 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 at 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 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 an electrochemical reaction occurs. 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 sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 213, and the parts of the positive electrode sheet and the negative electrode sheet without active substances respectively constitute the 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 charging and discharging 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 Figures 4 to 10 As shown, a first aspect of the present application proposes a battery device 10. In some embodiments of the present application, the battery device 10 includes a box body 30, a bottom protection plate assembly 40, and a plurality of battery cells 21. An accommodation cavity is formed inside the box body 30, and a plurality of battery cells 21 are arranged in the accommodation cavity. The bottom protection plate assembly 40 is arranged on one side of the plurality of battery cells 21 along the first direction X. The surface of the bottom protection plate assembly 40 facing the battery cells 21 is provided with an accommodation groove 411, and the accommodation groove 411 includes at least one first groove section 4111; wherein, the battery cell 21 is attached to the bottom protection plate assembly 40 along the first direction X and is configured to seal at least part of the accommodation groove 411 in the accommodation cavity. A first pressure relief mechanism 215 is provided on one side of the battery cell 21 facing the bottom protection plate assembly 40 along the first direction X. The projections of the first pressure relief mechanisms 215 of at least two battery cells 21 along the first direction X are respectively within the projection range of the same first groove section 4111 along the first direction X.

[0074] Specifically, the box body 30 forms the overall appearance structure of the battery device 10, and an accommodation cavity for accommodating the battery cells 21 and other electrical components is formed inside. The box body 30 may include a first part and a second part. The first part and the second part are covered with each other and jointly define an accommodation cavity for accommodating the battery cells 21. The first part may be a hollow structure with an open end, and the second part may be a plate-like structure. The second part is covered on the open side of the first part. Alternatively, both the first part and the second part may be hollow structures with an open side, and the open side of the first part is covered on the open side of the second part. The box body 30 may be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as a cuboid, cylinder or sphere. The material of the box body 30 may be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber reinforced epoxy resin. In some embodiments of the present application, the box body 30 includes a support frame 31 and an upper cover 32. Among them, the upper cover 32 is a hollow structure with an open end, and the support frame 31 is a substantially plate-like structure and is covered at the open end of the upper cover 32, so that an accommodation cavity for accommodating the battery cells 21 is formed between the support frame 31 and the upper cover 32. Among them, the support frame 31 and the upper cover 32 are arranged oppositely along the first direction X. After the battery device 10 is assembled to a vehicle or other electrical equipment, the support frame 31 is arranged below the upper cover 32. The first direction X may be the vertical direction, or the first direction X forms an angle greater than or equal to 0° and less than 90° with the vertical direction.

[0075] At least part of the bottom guard plate assembly 40 is arranged in the accommodating cavity and is arranged on a side close to the support frame 31 along the first direction X. A plurality of battery cells 21 are arranged between the upper cover 32 and the bottom guard plate assembly 40 along the first direction X. Among them, the bottom guard plate assembly 40 is provided with an accommodating groove 411 on the surface facing the battery cell 21, and the accommodating groove 411 includes at least one first groove section 4111. A first pressure relief mechanism 215 is provided on the side of the battery cell 21 facing the bottom guard plate assembly 40 along the first direction X. The first pressure relief mechanism 215 is configured to open when the internal pressure of the battery cell 21 is greater than a preset value, and is used to discharge the high-temperature and high-pressure mixture formed by the battery cell 21. Among them, the mixture includes liquid substances, solid substances and gaseous substances. Among them, the projections of the first pressure relief mechanisms 215 of at least two battery cells 21 in the plurality of battery cells 21 along the first direction X are respectively within the projection range of the same first groove section 4111 along the first direction X, that is, the first pressure relief mechanisms 215 of at least two battery cells 21 are arranged opposite to the first groove section 4111 along the first direction X. When the first pressure relief mechanism 215 is turned on, the battery cell 21 can directly discharge the mixture into the first groove section 4111 and collect it through the first groove section 4111. Since the first groove section 4111 and the first pressure relief mechanisms 215 of at least two battery cells 21 are arranged opposite to each other along the first direction X, the length dimension of the first groove section 4111 is greater than or equal to the maximum spacing dimension between the first pressure relief mechanisms 215 of at least two battery cells 21. When a part of the battery cells 21 or all of the battery cells 21 in at least two battery cells 21 have thermal runaway, the mixture discharged by the battery cells 21 can pass into the first groove section 4111 and diffuse along the length direction of the first groove section 4111, thereby reducing the accumulation of the mixture along the first direction X. Optionally, the bottom guard plate assembly 40 includes a metal plate, which has good supporting performance and thermal conductivity. Optionally, the first pressure relief mechanism 215 can be an explosion-proof valve.

[0076] Optionally, the surface of the bottom guard plate assembly 40 facing the battery cell 21 is a substantially planar structure, and the side of the battery cell 21 provided with the first pressure relief mechanism 215 can be fitted with the bottom guard plate assembly 40, thereby sealing at least part of the receiving groove 411 in the receiving cavity. Optionally, in order to facilitate the fitting connection between the battery cell 21 and the bottom guard plate assembly 40, the electrode terminal 214 is arranged along the first direction X on the side of the battery cell 21 away from the first pressure relief mechanism 215, that is, the first pressure relief mechanism 215 is arranged toward the bottom guard plate assembly 40, and the electrode terminal 214 is arranged toward the upper cover 32.

[0077] For the battery device 10 according to the present application, by making the projections of the first pressure relief mechanisms 215 of at least some of the battery cells 21 in the first direction X respectively fall within the projection range of the same first groove section 4111 in the first direction X, when a thermal runaway occurs in the battery cell 21, the battery cell 21 discharges the high-temperature and high-pressure mixture towards the inside of the first groove section 4111 through the first pressure relief mechanism 215. Since the first groove section 4111 is correspondingly arranged with the first pressure relief mechanisms 215 of at least two battery cells 21 in the first direction X, there is sufficient space in the first groove section 4111 to accommodate the mixture, thereby reducing the accumulation of the mixture, and further reducing the conductive connection between the battery cell 21 and the bottom protection plate assembly 40 through the accumulated mixture, improving the reliability of the battery device 10. At the same time, at least some of the accommodation grooves 411 in the sealed accommodation cavity of the battery cell 21 are used to make the high-temperature and high-pressure gas in the mixture flow into the accommodation groove 411 as much as possible, thereby reducing the damage caused by the high-temperature and high-pressure gas to other electrical components in the accommodation cavity.

[0078] Combined with Figures 4 to 10 As shown, in some embodiments of the present application, the bottom protection plate assembly 40 is further provided with a second pressure relief mechanism 43. Part of the bottom protection plate assembly 40 extends out of the accommodation cavity and is provided with part of the accommodation groove 411. The second pressure relief mechanism 43 is arranged outside the accommodation cavity and is configured to relieve the pressure of the accommodation groove 411 when the pressure in the accommodation groove 411 is greater than a preset value.

[0079] Specifically, part of the bottom protection plate assembly 40 is arranged in the accommodation cavity, and the other part of the bottom protection plate assembly 40 extends out of the accommodation cavity. The bottom protection plate assembly 40 arranged in the accommodation cavity and the bottom protection plate assembly 40 arranged outside the accommodation cavity are respectively provided with part of the accommodation groove 411, and the accommodation groove 411 arranged in the accommodation cavity and the accommodation groove 411 arranged outside the accommodation cavity are communicated with each other. The second pressure relief mechanism 43 is arranged outside the accommodation cavity and is configured to open the second pressure relief mechanism 43 when the pressure in the accommodation groove 411 is greater than a preset value. The accommodation groove 411 arranged outside the accommodation cavity is communicated with the outside of the box body 30 through the opened second pressure relief mechanism 43, so that the accommodation groove 411 arranged in the accommodation cavity is communicated with the outside of the box body 30, and then the pressure of the accommodation groove 411 is relieved. Optionally, the second pressure relief mechanism 43 can be an explosion-proof valve.

[0080] By arranging the second pressure relief mechanism 43 outside the accommodation cavity, when the high-temperature and high-pressure gas discharged by the thermally runaway battery cell 21 is excessive, resulting in the pressure in the accommodation groove 411 being greater than the preset value, the second pressure relief mechanism 43 is opened, and the accommodation groove 411 and the outside of the box body 30 are communicated, so as to discharge the high-temperature and high-pressure gas in the mixture and reduce the further damage to the battery cell 21 and the battery device 10 caused by the excessive pressure in the accommodation groove 411.

[0081] Combined withFigures 4 to 10 As shown, in some embodiments of the present application, the bottom guard plate assembly 40 includes a bottom guard plate 41 and a sealing plate 42. The bottom guard plate 41 is recessed in a direction away from the battery cell 21 to form a receiving groove 411. The sealing plate 42 is disposed on the side of the bottom guard plate 41 facing the battery cell 21 and is in contact with the bottom guard plate 41. At least a part of the sealing plate 42 is disposed outside the receiving cavity and is configured to seal the receiving groove 411 outside the receiving cavity.

[0082] Specifically, the bottom guard plate assembly 40 includes a bottom guard plate 41 and a sealing plate 42. The bottom guard plate 41 is recessed in a direction away from the battery cell 21 to form a receiving groove 411, so that the surface of the bottom guard plate 41 facing the battery cell 21 is substantially flat and is convenient for fitting with the battery cell 21. Optionally, the bottom guard plate 41 can be a metal plate. The sealing plate 42 is disposed on the side of the bottom guard plate 41 facing the battery cell 21 and is in contact with the opening edge of the receiving groove 411, thereby sealing part of the receiving groove 411. Since the second pressure relief mechanism 43 is disposed outside the receiving cavity and there is a part of the receiving groove 411 outside the receiving cavity, in order to facilitate sealing the receiving groove 411 outside the receiving cavity, at least a part of the sealing plate 42 is disposed outside the receiving cavity and is in contact with the opening edge of the receiving groove 411, thereby sealing the receiving groove 411 outside the receiving cavity. Optionally, the sealing plate 42 can be connected to the bottom guard plate 41 by welding, and a weld seam 46 is formed at the connection between the two. Alternatively, the sealing plate 42 can be connected to the bottom guard plate 41 by bonding. Optionally, the second pressure relief mechanism 43 can be disposed on the sealing plate 42, or the second pressure relief mechanism 43 can be disposed on the bottom guard plate 41. Optionally, the receiving groove 411 can be formed by stamping a part of the bottom guard plate 41.

[0083] In some embodiments of the present application, the structure of the sealing plate 42 can also be cancelled, and the inside of a part of the structure of the bottom guard plate 41 is set as the receiving groove.

[0084] By providing the sealing plate 42 outside the receiving cavity, the sealing plate 42 can cooperate with the bottom guard plate 41 disposed outside the receiving cavity to seal the receiving groove 411 outside the receiving cavity, reduce the leakage of high-temperature and high-pressure gas in the receiving groove 411, and enable the high-temperature and high-pressure gas to be discharged only through the second pressure relief mechanism 43 to the outside of the box body 30.

[0085] Combined with Figures 4 to 10 As shown, in some embodiments of the present application, a part of the sealing plate 42 extends into the receiving cavity and is configured to cooperate with the battery cell 21 to jointly seal the receiving groove 411 in the receiving cavity.

[0086] Specifically, a support beam 60 is further provided in the accommodation cavity. The support beam 60 is disposed on the side of the bottom protection plate assembly 40 facing the battery cell 21. Support beams 60 are respectively provided on opposite sides of the plurality of battery cells 21, so as to limit opposite sides of the plurality of battery cells 21 through the support beams 60 on both sides. Since accommodation grooves 411 are respectively provided inside and outside the accommodation cavity, and part of the accommodation grooves 411 need to pass through the side of the support beam 60 facing away from the battery cell 21, it may cause the gas in the accommodation groove 411 to leak through the connection between the support beam 60 and the bottom protection plate 41, or it may cause the gas in the accommodation groove 411 to leak through the gap between the support beam 60 and the battery cell 21. Therefore, part of the sealing plate 42 extends into the accommodation cavity to seal the accommodation groove 411 corresponding to the support beam 60 and the accommodation groove 411 between the support beam 60 and the battery cell 21.

[0087] Optionally, a recessed portion 412 is provided on the part of the bottom protection plate 41 for fitting with the sealing plate 42. The recessed portion 412 and the surface of the bottom protection plate 41 for fitting with the battery cell 21 form a stepped structure. The sealing plate 42 is disposed in the recessed portion 412 and fits with the recessed portion 412, so that the surface of the fitted sealing plate 42 facing the battery cell 21 and the surface of the bottom protection plate 41 facing the battery cell 21 are in the same plane, thereby facilitating the fitting connection between the battery cell 21 and the bottom protection plate 41 and the sealing plate 42, and being able to seal the accommodation groove 411.

[0088] By extending part of the sealing plate 42 into the interior of the accommodation cavity and cooperating with the battery cell 21 to jointly seal the accommodation groove 411 in the accommodation cavity, the high-temperature and high-pressure gas in the mixture can only flow into the accommodation groove 411, thereby reducing the diffusion of the high-temperature and high-pressure gas in the accommodation cavity and preventing damage to other electrical components in the accommodation cavity.

[0089] Combined Figures 4 to 10 As shown, in some embodiments of the present application, the bottom protection plate assembly 40 further includes an insulating layer 44, and the insulating layer 44 is disposed in the first groove section 4111.

[0090] Specifically, in some embodiments of the present application, the bottom guard plate 41 is a metal plate, and the mixture discharged from the thermally runaway battery cell 21 can conductively connect the bottom guard plate 41 and the battery cell 21 after accumulation. Therefore, an insulating layer 44 is provided in the first groove section 4111 to prevent the battery cell 21 from being conductively connected to the bottom guard plate 41 through the mixture. Herein, the mixture is a solid substance and a liquid substance. Optionally, the bottom guard plate 41 in the present application may be provided with the insulating layer 44 only in the first groove section 4111. Since the battery cell 21 and a part of the sealing plate 42 jointly seal the accommodation groove 411 in the accommodation cavity, the mixture in the first groove section 4111 will not overflow to the outside of the first groove section 4111. Therefore, the number of insulating layers 44 provided on other structures of the bottom guard plate 41 outside the first groove section 4111 can be reduced or eliminated, thereby reducing the number of insulating layers 44 provided and further reducing the cost.

[0091] By providing the insulating layer 44 in the first groove section 4111 and setting the melting point of the insulating layer 44 to be greater than or equal to 400 °C, the temperature of the mixture discharged from the thermally runaway battery cell 21 is generally lower than 400 °C, thereby reducing the melting of the insulating layer 44 by the mixture and reducing the conductive connection between the battery cell 21 and the bottom guard plate 41 through the accumulated mixture.

[0092] Combined Figures 4 to 10 As shown, in some embodiments of the present application, the melting point of the insulating layer 44 is greater than or equal to 400 °C.

[0093] Specifically, the temperature of the mixture discharged from the thermally runaway battery cell 21 is generally lower than 400 °C. In order to prevent the high-temperature mixture from melting the insulating layer 44, the melting point of the insulating layer 44 is set to be greater than or equal to 400 °C.

[0094] The temperature of the mixture discharged from the thermally runaway battery cell 21 is generally lower than 400 °C. By setting the melting point of the insulating layer 44 to be greater than or equal to 400 °C, the melting of the insulating layer 44 by the mixture can be reduced, thereby reducing the conductive connection between the battery cell 21 and the bottom guard plate 41 through the accumulated mixture.

[0095] Combined Figures 4 to 10 As shown, in some embodiments of the present application, the insulating layer 44 includes at least one of a PI film layer, an alumina ceramic layer, and a mica layer.

[0096] Specifically, the PI (Polyimide Film) film is a polyimide film, which has good insulation and can withstand a high temperature of 400 °C in a short time. Alumina ceramics have good insulation, and their melting point can reach between 1650 °C and 1990 °C. Mica has good insulation, and its melting point can reach above 1700 °C.

[0097] The PI film layer, the alumina ceramic layer and the mica layer all have good insulation properties, and their melting points are all greater than 400° C., thereby reducing the conductive connection between the battery cells 21 and the bottom guard plate 41 through the stacked mixture.

[0098] Combination Figures 4 to 10 As shown, in some embodiments of the present application, the first slot segment 4111 extends along the second direction Y, the first slot segment 4111 has a cross section perpendicular to the second direction Y, and the size of the cross section gradually decreases along the direction away from the battery cell 21, and the first direction X and the second direction Y intersect.

[0099] Specifically, the first slot section 4111 extends along the second direction Y, that is, the first slot section 4111 has a length direction along the second direction Y, and has a width direction along the third direction Z. Among them, the size of the first slot section 4111 along the length direction is greater than the size of the first slot section 4111 along the width direction. At least two battery cells 21 are arranged along the second direction Y, and the projections of at least two battery cells 21 arranged along the second direction Y along the first direction X are respectively within the projection range of the same first slot section 4111 along the first direction X. The cross section is perpendicular to the second direction Y, and the width dimension of the cross section along the first direction X toward one end of the battery cell 21 is greater than the width dimension of the cross section along the first direction X away from the battery cell 21. Optionally, 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.

[0100] By setting the cross-section to gradually decrease in size in the direction away from the battery cell 21, the mixture can be easily collected and retained at the bottom of the first groove section 4111, thereby reducing the accumulation of the mixture along the first direction and the abutment against the battery cell 21, thereby reducing damage to the battery cell 21.

[0101] Combination Figures 4 to 10 As shown, in some embodiments of the present application, the cross section is a trapezoidal surface.

[0102] Specifically, the trapezoidal surface is perpendicular to the second direction Y, and the width of one end of the trapezoidal surface along the first direction X toward the battery cell 21 is greater than the width of one end of the trapezoidal surface along the first direction X away from the battery cell 21 .

[0103] By setting the cross-section of the first groove section 4111 to a trapezoidal surface, and the size of the trapezoidal surface gradually decreases in the direction away from the battery cell 21, it is possible to facilitate the collection of the mixture and retain the collected mixture at the bottom of the first groove section 4111, thereby reducing the accumulation of the mixture along the first direction X and the abutment with the battery cell 21, thereby reducing damage to the battery cell 21.

[0104] CombinationFigures 4 to 10 As shown, in some embodiments of the present application, along the first direction X, the dimension of the first groove section 4111 is greater than or equal to 15 mm and less than or equal to 30 mm.

[0105] Specifically, along the first direction X, the depth dimension of the first groove section 4111 is greater than or equal to 15 mm and less than or equal to 30 mm. Among them, the depth dimension of the first groove section 4111 can be any value between 15 mm... 20 mm... 25 mm... 30 mm.

[0106] By setting the dimension of the first groove section 4111 along the first direction X to any value between 15 mm and 30 mm, the capacity of the first groove section 4111 can be increased, so as to accommodate more mixtures, reduce the contact between the stacked mixtures and the battery cell 21, and prevent damage to the battery cell 21.

[0107] Combined with Figures 4 to 10 As shown, in some embodiments of the present application, a plurality of battery cells 21 form a multi-column battery cell assembly 20 arranged along the third direction Z. Any column of the battery cell assembly 20 includes a plurality of battery cells 21 arranged along the second direction Y. The receiving groove 411 includes a plurality of first groove sections 4111 spaced along the third direction Z. The plurality of first groove sections 4111 are arranged in one-to-one correspondence with the multi-column battery cell assemblies 20 along the first direction X. Among them, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs.

[0108] Specifically, the battery device 10 includes a plurality of battery cell assemblies 20. Any one of the battery cell assemblies 20 includes a plurality of battery cells 21 arranged along the second direction Y, and the plurality of battery cell assemblies 20 are spaced along the third direction Z. By arranging a plurality of battery cell assemblies 20 in the receiving cavity, the capacitance of the battery device 10 can be increased. Among them, any column of the battery cell assembly 20 is correspondingly provided with a first groove section 4111 along the first direction X. Thus, when thermal runaway occurs in the battery cell 21 in any column of the battery cell assembly 20, the discharged mixture can be collected by the first groove section 4111. Since the number of columns of the battery cell assemblies 20 is multiple and the multiple columns of battery cell assemblies 20 are spaced along the third direction Z, the number of the first groove sections 4111 is also multiple, and the multiple first groove sections 4111 are spaced along the third direction Z.

[0109] By arranging the plurality of first groove sections 4111 in one-to-one correspondence with the multi-column battery cell assemblies 20 along the first direction X, the mixtures discharged by the battery cells 21 in the multi-column battery cell assemblies 20 can be collected respectively by the plurality of first groove sections 4111, so as to reduce the accumulation of the mixtures, and further reduce the conductive connection between the battery cell 21 and the bottom guard plate 41 through the stacked mixtures, and improve the reliability of the battery device 10.

[0110] Combined Figures 4 to 10 As shown, in some embodiments of the present application, the receiving groove 411 further includes a second groove section 4112, and one ends of a plurality of first groove sections 4111 along the second direction Y are respectively communicated with the second groove section 4112.

[0111] Specifically, in order to facilitate the unified collection and discharge of the high-temperature and high-pressure gas in the plurality of first groove sections 4111 and reduce the number of the second pressure relief mechanisms 43, the receiving groove 411 further includes a second groove section 4112. The second groove section 4112 extends along the third direction Z, and one ends of the plurality of first groove sections 4111 along the second direction Y are respectively communicated with the second groove section 4112. The high-temperature and high-pressure gas in the plurality of first groove sections 4111 can respectively pass through the second groove section 4112 and be introduced into the receiving groove outside the receiving cavity, and finally be discharged to the outside of the box body 30 through the second pressure relief mechanism 43. Among them, the second groove section 4112 can be arranged inside and outside the receiving cavity. Compared with arranging the second groove section 4112 inside the receiving cavity, arranging the second groove section 4112 outside the receiving cavity is convenient for improving the flatness of the bottom protection plate assembly 40 inside the receiving cavity, so as to facilitate the fitting connection with the battery cell 21. Optionally, the receiving groove 411 further includes a third groove section 4113, and the third groove section 4113 is arranged outside the receiving cavity and communicated with the second groove section 4112. The projection of the second pressure relief mechanism 43 along the first direction X is within the projection range of the third groove section 4113 along the first direction X. The sealing plate 42 covers the openings of the third groove section 4113, the second groove section 4112 and a part of the first groove section 4111.

[0112] By respectively communicating the plurality of first groove sections 4111 with the second groove section 4112, the high-temperature and high-pressure gas discharged from the thermally out-of-control battery cells 21 in each row of the battery cell assemblies 20 can be respectively introduced into the second groove section 4112 and collected or discharged to the outside of the box body 30 through the second groove section 4112.

[0113] Combined Figures 4 to 11 As shown, in some embodiments of the present application, flow blocking blocks 45 are respectively arranged at one ends of at least one first groove section 4111 close to the second groove section 4112 along the second direction Y, and the flow blocking blocks 45 are connected to the bottom surface of the first groove section 4111.

[0114] Specifically, the flow blocking blocks 45 protrude from the bottom surface of the first groove section 4111. Optionally, the flow blocking blocks 45 can be formed by stamping from the bottom surface of the first groove section 4111 towards the direction close to the battery cell 21, or the flow blocking blocks 45 can be prepared separately and connected to the bottom surface of the first groove section 4111 by bonding or welding.

[0115] By providing the baffle block 45 , it is possible to reduce the amount of liquid or solid mixture in the first slot section 4111 flowing into the second slot section 4112 and causing blockage of the second slot section 4112 .

[0116] Combination Figures 4 to 11 As shown, in some embodiments of the present application, the size of the baffle block 45 along the first direction X is smaller than the size of the first slot segment 4111 .

[0117] Moreover, the size of the baffle block 45 along the first direction X is smaller than the size of the first groove section 4111, that is, the side surface of the baffle block 45 facing the battery cell 21 is arranged inside the first groove section 4111, and is spaced apart from the side surface of the bottom guard plate 41 facing the battery cell 21, so that when the sealing plate 42 and / or the battery cell 21 seals the first groove section 4111, the gas in the first groove section 4111 can still flow into the second groove section 4112 through one side of the baffle block 45, and finally be discharged to the outside of the box body 30 through the second pressure relief mechanism 43.

[0118] By connecting the baffle block 45 to the bottom surface of the first slot section 4111, and setting the size of the baffle block 45 along the first direction X smaller than the size of the first slot section 4111, the high-temperature and high-pressure gas in the first slot section 4111 can flow into the second slot section 4112 through the baffle block 45 away from the bottom surface of the first slot section 4111, and be collected or discharged to the outside of the box body 30 through the second slot section 4112. Figures 4 to 12 As shown, in some embodiments of the present application, the battery device 10 also includes a heat exchange plate 50, which is arranged along the first direction X on the side of the bottom guard plate assembly 40 away from the battery cell 21, and the heat exchange plate 50 cooperates with the battery cell 21 for heat exchange through the bottom guard plate assembly 40.

[0119] Specifically, the heat exchange plate 50 is provided with a heat exchange cavity for the heat exchange medium to circulate. The heat exchange medium can exchange heat with the heat exchange plate 50 during the flow in the heat exchange cavity, thereby adjusting the temperature of the heat exchange plate 50. The heat exchange plate 50 also exchanges heat with the battery cell 21, thereby adjusting the temperature of the battery cell 21. In some embodiments of the present application, the heat exchange plate 50 is arranged along the first direction X on the side of the bottom guard plate 41 away from the battery cell 21. The bottom guard plate 41 can be a metal plate. The heat exchange plate 50 is connected to the battery cell 21 through the bottom guard plate 41 for heat exchange. Optionally, in order to improve the heat exchange efficiency of the battery cell 21, the part of the heat exchange cavity in the heat exchange plate 50 is fitted with the bottom guard plate 41. Optionally, in some embodiments of the present application, the heat exchange plate 50 can also be arranged on the side of the battery cell 21 away from the bottom guard plate assembly 40, that is, the heat exchange plate 50 is arranged between the battery cell 21 and the upper cover 32 along the first direction X.

[0120] By providing the heat exchange plate 50 , the heat exchange plate 50 can cooperate with the battery cell 21 in heat exchange through the bottom guard plate assembly 40 , thereby adjusting the temperature of the battery cell 21 .

[0121] Combination Figures 4 to 12 As shown, in some embodiments of the present application, the heat exchange plate 50 includes a plurality of heat exchange tubes 51 arranged at intervals, the heat exchange tubes 51 are fitted with the bottom guard plate assembly 40, and the first groove section 4111 is arranged between two adjacent heat exchange tubes 51.

[0122] Specifically, a heat exchange cavity is formed inside the heat exchange tube 51, and the heat exchange tube 51 is in contact with the bottom guard plate 41, thereby improving the heat exchange efficiency of the battery cell 21. In some embodiments of the present application, the plurality of first slot sections 4111 extend respectively along the second direction Y and are arranged at intervals along the third direction Z. Therefore, the plurality of heat exchange tubes 51 may extend respectively along the second direction Y and be arranged at intervals along the third direction Z, and the first slot section 4111 is arranged between two adjacent heat exchange tubes 51.

[0123] Optionally, the heat exchange plate 50 further includes a first current collector 52 and a second current collector 53 arranged at intervals along the second direction Y, a plurality of heat exchange tubes 51 are arranged between the first current collector 52 and the second current collector 53 along the second direction Y, and both ends of any heat exchange tube 51 along the second direction Y are respectively connected to the first current collector 52 and the second current collector 53. Among them, the first current collector 52 is arranged on a side of the second current collector 53 close to the second pressure relief mechanism 43, and the first current collector 52 is also connected with a liquid inlet end 54 and a liquid outlet end 55, and the liquid inlet end 54 and the liquid outlet end 55 are respectively extended to the outside of the accommodating cavity, so as to facilitate the connection with the external liquid supply pipeline and the liquid return pipeline.

[0124] By fitting the heat exchange tube 51 with the bottom guard plate assembly, the heat exchange efficiency of the heat exchange plate 50 to the bottom guard plate assembly 40 and the battery cell 21 can be improved. At the same time, by arranging the first groove section 4111 between two adjacent heat exchange tubes 51, the overall size of the battery device 10 along the first direction X can be reduced.

[0125] Combination Figures 4 to 12 As shown, in some embodiments of the present application, the box body 30 includes a support frame 31, and the support frame 31 is arranged on the side of the bottom guard plate assembly 40 away from the battery cell 21 along the first direction X. The support frame 31 is formed with at least one avoidance portion 311, and the projection of a part of the accommodating groove 411 along the first direction X is within the projection range of the avoidance portion 311 along the first direction X.

[0126] Specifically, the support frame 31 is used to support the bottom guard plate assembly 40 and the battery cells 21, so as to protect the bottom guard plate assembly 40 and the battery cells 21. The support frame 31 is formed with at least one avoidance portion 311, and the projection of a part of the accommodation groove 411 along the first direction X is within the projection range of the avoidance portion 311 along the first direction X, that is, the avoidance portion 311 can be correspondingly arranged with a part of the accommodation groove 411 along the first direction X. Thus, when the bottom guard plate assembly 40 is placed in the accommodation cavity, a part of the accommodation groove 411 can be arranged within the avoidance portion 311, thereby reducing the overall size of the battery device 10 along the first direction X. Optionally, the heat exchange plate 50 can be arranged between the bottom guard plate assembly 40 and the support frame 31, and the heat exchange plate 50 is connected to the support frame 31.

[0127] By providing the support frame 31, the support frame 31 can support the bottom guard plate assembly 40 and the battery cells 21, thereby improving the stability and reliability of the battery device 10. At the same time, at least one avoidance portion 311 is formed on the support frame 31, and the projection of a part of the accommodation groove 411 along the first direction X is within the projection range of the avoidance portion 311 along the first direction X, which can reduce the overall size of the battery device 10 along the first direction X.

[0128] In a second aspect, the present application provides an electrical equipment having the battery device 10 of any one of the above.

[0129] As Figure 1 shown, in a second aspect of the present application, an electrical equipment is proposed. The electrical equipment includes the battery device 10 of any one of the above.

[0130] 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 elaborated here.

[0131] As Figure 1 shown, in some embodiments of the present application, the electrical equipment can be a vehicle 1. The vehicle 1 includes the battery device 10 of 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.

[0132] As Figure 13 shown, in some embodiments of the present application, the electrical equipment can be an energy storage cabinet 2. The energy storage cabinet 2 includes the battery device 10 of any one of the above embodiments. The battery device 10 is used to provide electrical energy for the energy storage cabinet 2.

[0133] Among them, the energy storage cabinet 2 includes a first bin 71 and a second bin 72. The battery device 10 is arranged in the first bin 71, and a plurality of battery devices 10 are arranged in sequence in the vertical direction and connected into a battery cluster. The second pressure relief mechanisms 43 of the plurality of battery devices 10 in the same battery cluster are respectively communicated with the same exhaust pipe, so as to facilitate the discharge of high-temperature and high-pressure gas in the battery device and reduce the setting of connecting pipelines. An electronic control component or other accessories are arranged in the second bin 72 for the user to control the working process of the battery device 10. Optionally, the first bin 71 and the second bin 72 can be arranged side by side in the horizontal direction, or the first bin 71 and the second bin 72 can be stacked in the vertical direction.

[0134] 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 description. 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 exemplified below.

[0135] Combined with Figures 4 to 11 As shown, in some embodiments of the present application, the battery device 10 includes a box body 30, a bottom protection plate assembly 40 and a plurality of battery cells 21. An accommodation cavity is formed inside the box body 30, and a plurality of battery cells 21 are arranged in the accommodation cavity. The bottom protection plate assembly 40 is arranged on one side of the plurality of battery cells 21 along the first direction X. A receiving groove 411 is provided on the surface of the bottom protection plate assembly 40 facing the battery cells 21, and the receiving groove 411 includes at least one first groove segment 4111; among them, a first pressure relief mechanism 215 is provided on one side of the battery cell 21 facing the bottom protection plate assembly 40 along the first direction X, and the projections of the first pressure relief mechanisms 215 of at least two battery cells 21 along the first direction X are respectively within the projection range of the same first groove segment 4111 along the first direction X.

[0136] Optionally, the bottom protection plate assembly 40 is further provided with a second pressure relief mechanism 43. Part of the bottom protection plate assembly 40 extends out of the accommodation cavity and is provided with a part of the receiving groove 411. The second pressure relief mechanism 43 is arranged outside the accommodation cavity and is configured to relieve the pressure of the receiving groove 411 when the pressure in the receiving groove 411 is greater than a preset value.

[0137] Optionally, the battery cell 21 is in contact with the bottom guard plate assembly 40 along the first direction X and is configured to seal a part of the accommodation groove 411 in the accommodation cavity. The bottom guard plate assembly 40 includes a bottom guard plate 41 and a sealing plate 42. The bottom guard plate 41 is recessed towards the direction away from the battery cell 21 to form the accommodation groove 411. The sealing plate 42 is disposed on the side of the bottom guard plate 41 facing the battery cell 21 and is in contact with the bottom guard plate 41. At least a part of the sealing plate 42 is disposed outside the accommodation cavity and is configured to seal the accommodation groove outside the accommodation cavity. Another part of the sealing plate 42 extends into the accommodation cavity and is configured to cooperate with the battery cell 21 to jointly seal the accommodation groove 411 in the accommodation cavity.

[0138] Optionally, the bottom guard plate assembly 40 further includes an insulating layer 44. The insulating layer 44 is disposed in the first groove section 4111, and the melting point of the insulating layer is greater than or equal to 400 °C. The insulating layer 44 includes at least one of a PI film layer, an alumina ceramic layer, and a mica layer.

[0139] Optionally, a plurality of battery cells 21 form a multi-column battery cell assembly 20 arranged along the third direction Z. Any one column of the battery cell assembly 20 includes a plurality of battery cells 21 arranged along the second direction Y. The accommodation groove 411 includes a plurality of first groove sections 4111 spaced along the third direction Z. The plurality of first groove sections 4111 are arranged in one-to-one correspondence with the multi-column battery cell assembly 20 along the first direction X. The accommodation groove 411 further includes a second groove section 4112. One ends of the plurality of first groove sections 4111 along the second direction Y are respectively communicated with the second groove section 4112. A flow blocking block 45 is respectively provided at one end of any one first groove section 4111 along the second direction Y close to the second groove section 4112. The flow blocking block 45 is connected to the bottom surface of the first groove section 4111, and the dimension of the flow blocking block 45 along the first direction X is smaller than the dimension of the first groove section 4111. Among them, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs.

[0140] Optionally, the first groove section 4111 extends along the second direction Y. The first groove section 4111 has a cross-section perpendicular to the second direction Y, and the cross-section is a trapezoidal surface, and the dimension of the trapezoidal surface gradually decreases along the direction away from the battery cell 21.

[0141] Optionally, along the first direction X, the dimension of the first groove section 4111 is greater than or equal to 15 mm and less than or equal to 30 mm.

[0142] Optionally, the battery device 10 further includes a heat exchange plate 50. The heat exchange plate 50 is disposed on the side of the bottom guard plate assembly 40 away from the battery cell 21 along the first direction X. The heat exchange plate 50 exchanges heat with the battery cell 21 through the bottom guard plate 41. The heat exchange plate 50 includes a plurality of heat exchange tubes 51 arranged at intervals. The heat exchange tubes 51 are in contact with the bottom guard plate 41, and the first groove section 4111 is disposed between two adjacent heat exchange tubes 51.

[0143] Optionally, the box body 30 includes a support frame 31 disposed on the side of the bottom protection plate assembly 40 away from the battery cell 21 along the first direction X. The support frame 31 is formed with at least one avoidance portion 311, and the projection of a part of the accommodation groove 411 along the first direction X is within the projection range of the avoidance portion 311 along the first direction X.

[0144] 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 on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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 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 that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, wherein a receiving cavity is formed inside the box body; A plurality of battery cells, wherein the plurality of battery cells are arranged in the accommodation cavity; A bottom guard plate assembly, the bottom guard plate assembly is arranged on one side of the plurality of battery cells along a first direction, a surface of the bottom guard plate assembly facing the battery cells is provided with a receiving groove, the receiving groove includes at least one first groove section; Among them, the battery cell is fitted with the bottom guard plate assembly along the first direction and is configured to seal at least part of the accommodating groove in the accommodating cavity, and each of the battery cells is provided with a first pressure relief mechanism on the side facing the bottom guard plate assembly along the first direction, and the projections of the first pressure relief mechanisms of at least two of the battery cells along the first direction are respectively within the projection range of the same first groove section along the first direction.

2. The battery device according to claim 1, characterized in that: The bottom guard plate assembly is also provided with a second pressure relief mechanism. Part of the bottom guard plate assembly extends to the outside of the accommodating cavity and is provided with part of the accommodating groove. The second pressure relief mechanism is arranged outside the accommodating cavity. The second pressure relief mechanism is configured to relieve pressure in the accommodating groove when the pressure in the accommodating groove is greater than a preset value.

3. The battery device according to claim 2, characterized in that: The bottom guard plate assembly includes a bottom guard plate and a sealing plate. The bottom guard plate is recessed in a direction away from the battery cell to form the receiving groove. The sealing plate is arranged on a side of the bottom guard plate facing the battery cell and is fitted with the bottom guard plate. At least a portion of the sealing plate is arranged outside the receiving cavity and is configured to seal the receiving groove outside the receiving cavity.

4. The battery device according to claim 3, characterized in that: A portion of the sealing plate extends into the accommodating cavity and is configured to cooperate with the battery cell to seal the accommodating groove in the accommodating cavity.

5. The battery device according to any one of claims 1 to 4, characterized in that: The bottom guard plate assembly also includes an insulating layer, which is arranged in the first groove section.

6. The battery device according to claim 5, characterized in that The melting point of the insulating layer is greater than or equal to 400°C.

7. The battery device according to claim 5, characterized in that: The insulating layer includes at least one of a PI film layer, an alumina ceramic layer and a mica layer.

8. The battery device according to any one of claims 1 to 4, characterized in that: The first slot segment extends along a second direction, has a cross section perpendicular to the second direction, and a size of the cross section gradually decreases along a direction away from the battery cell, and the first direction intersects the second direction.

9. The battery device according to claim 8, characterized in that: The cross section is a trapezoidal surface.

10. The battery device according to any one of claims 1 to 4, characterized in that: Along the first direction, a size of the first slot segment is greater than or equal to 15 mm and less than or equal to 30 mm.

11. The battery device according to any one of claims 1 to 4, characterized in that: A plurality of the battery cells form a plurality of columns of battery cell assemblies arranged along a third direction, any column of the battery cell assemblies includes a plurality of the battery cells arranged along a second direction, the accommodating groove includes a plurality of the first groove sections arranged at intervals along the third direction, and the plurality of the first groove sections are arranged one-to-one with the plurality of columns of the battery cell assemblies along the first direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

12. The battery device according to claim 11, characterized in that: The accommodating groove further includes a second groove section, and one end of a plurality of the first groove sections along the second direction are respectively connected to the second groove section.

13. The battery device according to claim 12, characterized in that: At least one of the first slot sections is provided with a flow block at one end close to the second slot section along the second direction, and the flow block is connected to the bottom surface of the first slot section.

14. The battery device according to claim 13, characterized in that: The size of the baffle block along the first direction is smaller than the size of the first slot segment.

15. The battery device according to any one of claims 1 to 4, characterized in that: The battery device further comprises a heat exchange plate, which is arranged along the first direction on a side of the bottom guard plate assembly away from the battery cell, and the heat exchange plate cooperates with the battery cell for heat exchange through the bottom guard plate assembly.

16. The battery device according to claim 15, characterized in that: The heat exchange plate includes a plurality of heat exchange tubes arranged at intervals, the heat exchange tubes are fitted with the bottom guard plate assembly, and the first groove section is arranged between two adjacent heat exchange tubes.

17. The battery device according to any one of claims 1 to 4, characterized in that: The box body includes a support frame, which is arranged on a side of the bottom guard plate assembly away from the battery cell along the first direction, and the support frame is formed with at least one avoidance portion, and the projection of part of the accommodating groove along the first direction is within the projection range of the avoidance portion along the first direction.

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

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