Battery devices and electrical equipment

Abstract

The present application relates to the field of battery technology, and specifically to a battery device and electrical equipment. The battery device of the present application includes a box body, a bottom guard plate assembly, and a plurality of battery cells. A accommodating cavity is formed inside the box body, and a plurality of battery cells are arranged in the accommodating cavity. The bottom guard plate assembly is arranged on one side of the plurality of battery cells along the first direction. The surface of the bottom guard plate assembly facing the battery cells is provided with an accommodating groove, and the accommodating groove includes at least one first groove section. The battery cells are fitted with the bottom guard plate assembly along the first direction and are configured to seal at least part of the accommodating groove in the accommodating cavity. The battery cells are provided with a first pressure relief mechanism on the side facing the bottom guard plate assembly along the first direction. 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. According to the battery device of the present application, it is possible to reduce the electrical connection between the battery cells and the bottom guard plate conductive assembly through the stacked mixture, thereby improving the reliability of the battery device.

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] A battery device is typically composed of multiple battery cells. To increase the device's energy density, these cells are arranged very closely together, which can lead to heat accumulation within the device. When this heat builds up to a certain level, it can cause thermal runaway.

[0003] When a battery cell experiences thermal runaway, the explosion-proof valve at the bottom of the battery cell opens, allowing a high-temperature, high-pressure gas-liquid-solid mixture to escape through the valve and accumulate on the bottom shield, damaging the insulating paint and causing insulation failure. If the accumulation reaches a certain level, the thermally runaway battery cell can connect to the bottom shield through the accumulated material, causing accidents such as fire or explosion, posing a serious threat to the safety of users and property. Summary of the Invention

[0004] In view of the defects of the prior art, the purpose of the present application is to provide a battery device and an electrical equipment, which can effectively solve the problem of conductive connection between battery cells in thermal runaway and the bottom guard plate.

[0005] In a first aspect, the present application provides a battery device, comprising:

[0006] A box body, wherein a receiving cavity is formed inside the box body;

[0007] A plurality of battery cells are arranged in the accommodating cavity;

[0008] A bottom guard plate assembly is provided on one side of the plurality of battery cells along a first direction, and a surface of the bottom guard plate assembly facing the battery cells is provided with a receiving groove, the receiving groove including at least one first groove section;

[0009] 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. Each battery cell 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 battery cells along the first direction are respectively within the projection range of the same first groove section along the first direction.

[0010] According to the battery device of the present application, by placing the projections of the first pressure relief mechanisms of at least a portion of the battery cells along the first direction within the projection range of the same first slot section along the first direction, when a battery cell experiences thermal runaway, the battery cell discharges a high-temperature, high-pressure mixture into the first slot section through the first pressure relief mechanism. Since the first slot section is arranged corresponding to the first pressure relief mechanisms of at least two battery cells along the first direction, there is sufficient space within the first slot section to accommodate the mixture, thereby reducing the accumulation of the mixture, and further reducing the conductive connection between the battery cells and the bottom guard plate assembly through the accumulated mixture, thereby improving the reliability of the battery device. At the same time, by sealing at least a portion of the storage slots within the battery cell storage cavity, the high-temperature, high-pressure gas in the mixture flows into the storage slots as much as possible, thereby reducing the damage caused by the high-temperature, high-pressure gas to other electrical components in the storage cavity.

[0011] In some embodiments of the present application, 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 a partial accommodating groove, and the second pressure relief mechanism is provided 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.

[0012] By arranging a second pressure relief mechanism on the outside of the accommodating chamber, when the battery cell in thermal runaway discharges too much high-temperature and high-pressure gas, causing the pressure in the accommodating tank to be greater than a preset value, the second pressure relief mechanism opens and connects the accommodating tank and the outside of the box, thereby being used to discharge the high-temperature and high-pressure gas in the mixture and reducing further damage to the battery cell and battery device caused by excessive pressure in the accommodating tank.

[0013] In some embodiments of the present application, 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 a receiving groove. The sealing plate is arranged on the side of the bottom guard plate facing the battery cell and is in contact with the bottom guard plate. At least part of the sealing plate is arranged outside the receiving cavity and is configured to seal the receiving groove outside the receiving cavity.

[0014] By arranging a sealing plate on the outside of the accommodating cavity, the sealing plate can cooperate with the bottom guard plate arranged outside the accommodating cavity, thereby sealing the accommodating groove outside the accommodating cavity, reducing the leakage of high-temperature and high-pressure gas in the accommodating groove, and allowing the high-temperature and high-pressure gas to be discharged to the outside of the box only through the second pressure relief mechanism.

[0015] In some embodiments of the present application, a portion of the sealing plate extends into the accommodating cavity and is configured to cooperate with the battery cell to jointly seal the accommodating groove in the accommodating cavity.

[0016] By extending part of the sealing plate into the interior of the accommodating cavity and cooperating with the battery cell to seal the accommodating groove in the accommodating cavity, the high-temperature and high-pressure gas in the mixture can only flow into the accommodating groove, thereby reducing the diffusion of the high-temperature and high-pressure gas in the accommodating cavity and damage to other electrical components in the accommodating cavity.

[0017] In some embodiments of the present application, the bottom guard plate assembly further includes an insulating layer, which is disposed in the first groove section.

[0018] By arranging the insulating layer in the first groove section, the insulating layer can reduce the conductive connection between the battery cells and the bottom guard plate through the stacked mixture.

[0019] In some embodiments of the present application, the melting point of the insulating layer is greater than or equal to 400°C.

[0020] The temperature of the mixture discharged from the thermal runaway battery cells 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 cells and the bottom guard plate through the accumulated mixture.

[0021] 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.

[0022] 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 and the bottom guard plate through the stacked mixture.

[0023] In some embodiments of the present application, the first slot segment extends along the second direction, has a cross section perpendicular to the second direction, and the cross section gradually decreases in size in a direction away from the battery cell, and the first direction and the second direction intersect.

[0024] By setting the cross-section to gradually decrease in size in the direction away from the battery cell, it is easy 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 the abutment against the battery cell, thereby reducing damage to the battery cell.

[0025] In some embodiments of the present application, the cross section is a trapezoidal surface.

[0026] By setting the cross-section of the first groove section to a trapezoidal surface, and the size of the trapezoidal surface gradually decreasing in the direction away from the battery cell, it is possible to facilitate the collection of the mixture and retain the collected mixture at the bottom of the first groove section, thereby reducing the accumulation of the mixture along the first direction and the contact with the battery cell, thereby reducing damage to the battery cell.

[0027] In some embodiments of the present application, 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.

[0028] By setting the dimension 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, thereby accommodating more mixture and reducing the contact between the accumulated mixture and the battery cell and causing damage to the battery cell.

[0029] In some embodiments of the present application, a plurality of battery cells form a plurality of columns of battery cell assemblies arranged along a third direction, any column of battery cell assemblies includes a plurality of battery cells arranged along a second direction, the accommodating groove includes a plurality of first groove sections arranged at intervals along the third direction, and the plurality of first groove sections are arranged one-to-one corresponding to the plurality of columns of battery cell assemblies along the first direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0030] By arranging multiple first groove sections in a one-to-one correspondence with multiple columns of battery cell assemblies along the first direction, the mixture discharged from the battery cells in the multiple columns of battery cell assemblies can be collected respectively through the multiple first groove sections, thereby reducing the accumulation of the mixture, and further reducing the conductive connection between the battery cells and the bottom guard plate assembly through the accumulated mixture, thereby improving the reliability of the battery device.

[0031] In some embodiments of the present application, the accommodating groove further includes a second groove section, and one end of each of the plurality of first groove sections along the second direction is respectively connected to the second groove section.

[0032] By connecting multiple first slot sections with the second slot sections respectively, the high-temperature and high-pressure gases emitted by the battery cells in thermal runaway in multiple rows of battery cell assemblies can be respectively introduced into the second slot sections and collected or discharged to the outside of the box through the second slot sections.

[0033] In some embodiments of the present application, at least one first slot segment is provided with a flow block at one end close to the second slot segment along the second direction, and the flow block is connected to the bottom surface of the first slot segment.

[0034] By providing the flow blocking block, it is possible to reduce the liquid or solid mixture in the first trough section from flowing into the second trough section through the bottom of the first trough section and causing blockage of the second trough section.

[0035] In some embodiments of the present application, a size of the baffle along the first direction is smaller than a size of the first slot segment.

[0036] By connecting the baffle block to the bottom surface of the first slot section and setting the size of the baffle block along the first direction to be smaller than the size of the first slot section, the high-temperature and high-pressure gas in the first slot section can flow into the second slot section through the side of the baffle block away from the bottom surface of the first slot section, and be collected or discharged to the outside of the box through the second slot section.

[0037] In some embodiments of the present application, the battery device further includes 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In some embodiments of the present application, the box body includes a support frame, which is arranged on the 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.

[0042] 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.

[0043] In a second aspect, the present application provides an electrical device having any of the above-mentioned battery devices.

[0044] 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

[0045] 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:

[0046] Figure 1is a structural schematic diagram of a vehicle provided in one embodiment of the present application;

[0047] Figure 2 This is a schematic structural diagram of a battery cell assembly provided in one embodiment of the present application;

[0048] Figure 3 This is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application;

[0049] Figure 4 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0050] Figure 5 yes Figure 4 The internal structure of the battery device after removing the upper cover;

[0051] Figure 6 yes Figure 5 A top view of the battery device in FIG.

[0052] Figure 7 yes Figure 6 AA cross-sectional structural diagram in;

[0053] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of part B;

[0054] Figure 9 yes Figure 5 A schematic structural diagram of the bottom guard plate assembly;

[0055] Figure 10 yes Figure 9 Schematic diagram of the disassembled structure of the bottom guard plate assembly;

[0056] Figure 11 yes Figure 10 Schematic diagram of the enlarged structure of part C;

[0057] Figure 12 yes Figure 4 Schematic diagram of the split structure of the support frame and bottom guard plate assembly;

[0058] Figure 13 It is a structural diagram of an energy storage cabinet provided in one embodiment of the present application.

[0059] The accompanying drawings in the specific implementation manner are as follows:

[0060] 1. Vehicle;

[0061] 10. Battery device; 11. Controller; 12. Motor;

[0062] 20. Battery cell assembly; 21. Battery cell; 211. End cap; 212. Housing; 213. Electrode assembly; 214. Electrode terminal; 215. First pressure relief mechanism;

[0063] 30. Box body; 31. Support frame; 311. Avoidance portion; 32. Upper cover;

[0064] 40. Bottom guard plate assembly; 41. Bottom guard plate; 411. Accommodation groove; 4111. First groove section; 4112. Second groove section; 4113. Third groove section; 412. Recessed portion; 42. Sealing plate; 43. Second pressure relief mechanism; 44. Insulation layer; 45. Flow block; 46. Welding seam;

[0065] 50. Heat exchange plate; 51. Heat exchange tube; 52. First collector; 53. Second collector; 54. Liquid inlet; 55. Liquid outlet;

[0066] 60. Support beam;

[0067] 71. First warehouse; 72. Second warehouse;

[0068] 2. Energy storage cabinet;

[0069] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] A battery device is typically composed of multiple battery cells. To increase the device's energy density, these cells are arranged very closely together, which can lead to heat accumulation within the device. When this heat builds up to a certain level, it can cause thermal runaway.

[0078] When a battery cell experiences thermal runaway, the explosion-proof valve at the bottom of the battery cell opens, allowing a high-temperature, high-pressure gas-liquid-solid mixture to escape through the valve and accumulate on the bottom shield, damaging the insulating paint and causing insulation failure. If the accumulation reaches a certain level, the thermally runaway battery cell can connect to the bottom shield through the accumulated material, causing accidents such as fire or explosion, posing a serious threat to the safety of users and property.

[0079] In order to solve the problem of conductive connection between battery cells in thermal runaway and the bottom guard plate, the present application proposes a battery device and an electrical equipment 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 cells and the bottom guard plate assembly through the accumulated mixture, thereby improving the reliability of the battery device.

[0080] 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 assemblies may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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 .

[0094] Figure 2 FIG. 2 is a schematic structural diagram of a battery cell assembly 20 according to an embodiment of the present application. Figure 2 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.

[0095] 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.

[0096] Figure 3 Schematic diagram of the exploded structure of a 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 3 The battery cell 21 includes an end cover 211 , a shell 212 and an electrode assembly 213 .

[0097] 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.

[0098] 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.

[0099] 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.

[0100] Combine Figures 4 to 10 As shown, the first aspect of the present application provides a battery device 10. In some embodiments of the present application, the battery device 10 includes a housing 30, a bottom guard plate assembly 40, and a plurality of battery cells 21. The housing 30 has an interior formed with a receiving cavity, and the plurality of battery cells 21 are disposed in the receiving cavity. The bottom guard plate assembly 40 is disposed on one side of the plurality of battery cells 21 along a first direction X. The bottom guard plate assembly 40 has a receiving groove 411 on a surface facing the battery cells 21. The receiving groove 411 includes at least one first groove section 4111. The battery cells 21 are aligned with the bottom guard plate assembly 40 along the first direction X and are configured to seal at least a portion of the receiving groove 411 within the receiving cavity. A first pressure relief mechanism 215 is provided on the side of the battery cells 21 facing the bottom guard 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.

[0101] Specifically, the housing 30 forms the overall exterior structure of the battery device 10, and internally defines a cavity for accommodating the battery cells 21 and other electrical components. The housing 30 may include a first portion and a second portion, which cover each other and together define a cavity for accommodating the battery cells 21. The first portion may be a hollow structure with one end open, and the second portion may be a plate-like structure, with the second portion covering the open side of the first portion. Alternatively, the first and second portions may both be hollow structures with one end open, with the open side of the first portion covering the open side of the second portion. 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 alloy materials such as aluminum alloys and iron alloys, polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin. In some embodiments of the present application, the housing 30 includes a support frame 31 and an upper cover 32. The upper cover 32 is a hollow structure with an opening at one end, and the support frame 31 is a generally plate-shaped structure that covers the opening at one end of the upper cover 32, thereby forming a receiving cavity for accommodating the battery cells 21 between the support frame 31 and the upper cover 32. The support frame 31 and the upper cover 32 are arranged relative to each other along a first direction X. After the battery device 10 is assembled into a vehicle or other electrical equipment, the support frame 31 is arranged below the upper cover 32. The first direction X can be a vertical direction, or the first direction X can be arranged at an angle greater than or equal to 0° and less than 90° with the vertical direction.

[0102] At least a portion of the bottom guard plate assembly 40 is disposed within the accommodating cavity and is disposed on a side adjacent to the support frame 31 along the first direction X. A plurality of battery cells 21 are disposed between the upper cover 32 and the bottom guard plate assembly 40 along the first direction X. A accommodating groove 411 is provided on the surface of the bottom guard plate assembly 40 facing the battery cells 21. 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 cells 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 cells 21 exceeds a preset value, and is used to discharge the high-temperature, high-pressure mixture formed by the battery cells 21. The mixture includes liquid, solid, and gaseous substances. The projections of the first pressure relief mechanisms 215 of at least two of the multiple battery cells 21 along the first direction X are respectively within the projection range of the same first trough section 4111 along the first direction X. That is, the first pressure relief mechanisms 215 of the at least two battery cells 21 are disposed opposite the first trough section 4111 along the first direction X. When the first pressure relief mechanisms 215 are activated, the battery cells 21 can directly discharge the mixture into the first trough section 4111, where it is collected by the first trough section 4111. Because the first trough section 4111 and the first pressure relief mechanisms 215 of the at least two battery cells 21 are disposed opposite each other along the first direction X, the length of the first trough section 4111 is greater than or equal to the maximum spacing between the first pressure relief mechanisms 215 of the at least two battery cells 21. If thermal runaway occurs in some or all of the at least two battery cells 21, the mixture discharged from the battery cells 21 can flow into the first trough section 4111 and diffuse along its length, 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 support performance and thermal conductivity. Optionally, the first pressure relief mechanism 215 can be an explosion-proof valve.

[0103] Optionally, the surface of the bottom guard plate assembly 40 facing the battery cell 21 is a generally planar structure, and the side of the battery cell 21 provided with the first pressure relief mechanism 215 can be aligned with the bottom guard plate assembly 40, thereby sealing at least a portion of the receiving slot 411 within the receiving cavity. Optionally, to facilitate the alignment and connection between the battery cell 21 and the bottom guard plate assembly 40, the electrode terminal 214 is disposed along the first direction X on the side of the battery cell 21 facing away from the first pressure relief mechanism 215, i.e., the first pressure relief mechanism 215 is disposed toward the bottom guard plate assembly 40, and the electrode terminal 214 is disposed toward the upper cover 32.

[0104] According to the battery device 10 of the present application, by positioning the projections of the first pressure relief mechanisms 215 of at least a portion of the battery cells 21 along the first direction X within the projection range of the same first slot section 4111 along the first direction X, when a battery cell 21 experiences thermal runaway, the battery cell 21 releases a high-temperature, high-pressure mixture into the first slot section 4111 through the first pressure relief mechanisms 215. Because the first slot section 4111 is positioned corresponding to the first pressure relief mechanisms 215 of at least two battery cells 21 along the first direction X, there is sufficient space within the first slot section 4111 to accommodate the mixture, thereby reducing the accumulation of the mixture and, in turn, reducing the possibility of conductive connection between the battery cells 21 and the bottom guard plate assembly 40 via the accumulated mixture, thereby improving the reliability of the battery device 10. Furthermore, by sealing at least a portion of the receiving slot 411 within the receiving chamber by the battery cells 21, the high-temperature, high-pressure gas in the mixture flows into the receiving slot 411 as much as possible, thereby reducing damage to other electrical components within the receiving chamber caused by the high-temperature, high-pressure gas.

[0105] Combine Figures 4 to 10 As shown, in some embodiments of the present application, the bottom guard plate assembly 40 is also provided with a second pressure relief mechanism 43, part of the bottom guard plate assembly 40 extends to the outside of the accommodating cavity and is provided with a partial accommodating groove 411, and the second pressure relief mechanism 43 is provided outside the accommodating cavity. The second pressure relief mechanism 43 is configured to relieve pressure in the accommodating groove 411 when the pressure in the accommodating groove 411 is greater than a preset value.

[0106] Specifically, part of the bottom guard plate assembly 40 is arranged in the accommodating cavity, and the other part of the bottom guard plate assembly 40 extends to the outside of the accommodating cavity, and the bottom guard plate assembly 40 arranged in the accommodating cavity and the bottom guard plate assembly 40 arranged outside the accommodating cavity are respectively provided with a partial accommodating groove 411, and the accommodating groove 411 arranged in the accommodating cavity and the accommodating groove 411 arranged outside the accommodating cavity are connected to each other. The second pressure relief mechanism 43 is arranged outside the accommodating cavity and is configured to open when the pressure in the accommodating groove 411 is greater than a preset value. The accommodating groove 411 arranged outside the accommodating cavity is connected to the outside of the box body 30 through the opened second pressure relief mechanism 43, thereby making the accommodating groove 411 arranged in the accommodating cavity connected to the outside of the box body 30, and then relieving the pressure of the accommodating groove 411. Optionally, the second pressure relief mechanism 43 can be an explosion-proof valve.

[0107] By arranging a second pressure relief mechanism 43 on the outside of the accommodating chamber, when the battery cell 21 in thermal runaway discharges excessive high-temperature and high-pressure gas, causing the pressure in the accommodating tank 411 to be greater than a preset value, the second pressure relief mechanism 43 opens and connects the accommodating tank 411 and the outside of the box body 30, thereby being used to discharge the high-temperature and high-pressure gas in the mixture, reducing further damage to the battery cell 21 and the battery device 10 caused by excessive pressure in the accommodating tank 411.

[0108] Combine Figures 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 arranged 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 part of the sealing plate 42 is arranged outside the receiving cavity and is configured to seal the receiving groove 411 outside the receiving cavity.

[0109] 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, thereby making the surface of the bottom guard plate 41 facing the battery cell 21 substantially flat and facilitating contact with the battery cell 21. Optionally, the bottom guard plate 41 may 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 partially sealing the receiving groove 411. Since the second pressure relief mechanism 43 is disposed outside the receiving cavity, and a portion of the receiving groove 411 is provided outside the receiving cavity, to facilitate sealing the receiving groove 411 outside the receiving cavity, at least a portion 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 may be connected to the bottom guard plate 41 by welding, forming a weld 46 at the connection between the two. Alternatively, the sealing plate 42 may be bonded to the bottom guard plate 41. Alternatively, the second pressure relief mechanism 43 may be provided on the sealing plate 42, or the second pressure relief mechanism 43 may be provided on the bottom guard plate 41. Alternatively, the receiving groove 411 may be formed by stamping a portion of the bottom guard plate 41.

[0110] In some embodiments of the present application, the structure of the sealing plate 42 may be eliminated, and the interior of a portion of the structure of the bottom guard plate 41 may be set as a receiving groove.

[0111] By setting a sealing plate 42 on the outside of the accommodating cavity, the sealing plate 42 can cooperate with the bottom guard plate 41 provided on the outside of the accommodating cavity, thereby sealing the accommodating groove 411 outside the accommodating cavity, reducing the leakage of the high-temperature and high-pressure gas in the accommodating groove 411, and allowing the high-temperature and high-pressure gas to be discharged to the outside of the box body 30 only through the second pressure relief mechanism 43.

[0112] Combine Figures 4 to 10 As shown, in some embodiments of the present application, a portion of the sealing plate 42 extends into the accommodating cavity and is configured to cooperate with the battery cell 21 to jointly seal the accommodating groove 411 in the accommodating cavity.

[0113] Specifically, a support beam 60 is further provided in the accommodating cavity. The support beam 60 is provided on the side of the bottom guard plate assembly 40 facing the battery cell 21. Support beams 60 are respectively provided on opposite sides of the multiple battery cells 21, thereby limiting the opposite sides of the multiple battery cells 21 by the support beams 60 on both sides. Since accommodating grooves 411 are respectively provided inside and outside the accommodating cavity, some accommodating grooves 411 need to pass through the side of the support beam 60 facing away from the battery cell 21, which may cause the gas in the accommodating grooves 411 to leak through the connection between the support beam 60 and the bottom guard plate 41, or may cause the gas in the accommodating grooves 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 accommodating cavity to seal the accommodating grooves 411 corresponding to the support beam 60 and the accommodating grooves 411 between the support beam 60 and the battery cell 21.

[0114] Optionally, a recessed portion 412 is provided in the portion of the bottom guard plate 41 for fitting with the sealing plate 42. The recessed portion 412 and the surface of the bottom guard plate 41 for fitting with the battery cell 21 have a step-like structure. The sealing plate 42 is arranged in the recessed portion 412 and fits with the recessed portion 412, so that the surface of the sealing plate 42 facing the battery cell 21 and the surface of the bottom guard plate 41 facing the battery cell 21 after fitting are in the same plane, thereby facilitating the fitting connection between the battery cell 21 and the bottom guard plate 41 and the sealing plate 42, and being able to seal the accommodating groove 411.

[0115] By extending part of the sealing plate 42 into the interior of the accommodating cavity and cooperating with the battery cell 21 to seal the accommodating groove 411 in the accommodating cavity, the high-temperature and high-pressure gas in the mixture can only flow into the accommodating groove 411, thereby reducing the diffusion of the high-temperature and high-pressure gas in the accommodating cavity and damaging other electrical components in the accommodating cavity.

[0116] Combine Figures 4 to 10 As shown, in some embodiments of the present application, the bottom guard plate assembly 40 further includes an insulating layer 44 , and the insulating layer 44 is disposed in the first groove section 4111 .

[0117] Specifically, in some embodiments of the present application, the bottom guard plate 41 is a metal plate, and the mixture discharged by the battery cell 21 in thermal runaway 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. The mixture here is a solid substance and a liquid substance. Optionally, the bottom guard plate 41 in the present application may only be provided with an insulating layer 44 in the first groove section 4111. Since the battery cell 21 and part of the sealing plate 42 jointly seal the accommodating groove 411 in the accommodating cavity, the mixture in the first groove section 4111 will not overflow to the outside of the first groove section 4111. Therefore, it is possible to reduce or eliminate the need to provide an insulating layer 44 on other structures of the bottom guard plate 41 outside the first groove section 4111, thereby reducing the number of insulating layers 44 provided, thereby reducing costs.

[0118] By arranging 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 thermal 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 stacked mixture.

[0119] Combine 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.

[0120] Specifically, the temperature of the mixture discharged from the battery cell 21 in thermal runaway is generally lower than 400° C. 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.

[0121] 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 mixture can be reduced from melting the insulating layer 44, thereby reducing the conductive connection between the battery cell 21 and the bottom guard plate 41 through the accumulated mixture.

[0122] Combine 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.

[0123] Specifically, PI (Polyimide Film) is a polyimide film with excellent insulation properties and the ability to withstand temperatures of 400°C for short periods of time. Alumina ceramics also offer excellent insulation and a melting point between 1650°C and 1990°C. Mica also offers excellent insulation and a melting point exceeding 1700°C.

[0124] 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 cells 21 and the bottom guard plate 41 through the stacked mixture.

[0125] Combine 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.

[0126] Specifically, the first slot segment 4111 extends along the second direction Y, i.e., the first slot segment 4111 has a length along the second direction Y and a width along the third direction Z. The length of the first slot segment 4111 is greater than the width of the first slot segment 4111. At least two battery cells 21 are arranged along the second direction Y, and the projections of the 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 segment 4111 along the first direction X. The cross section is perpendicular to the second direction Y, and the width of the cross section along the first direction X toward the battery cell 21 is greater than the width 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 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 10.

[0127] By setting the cross-section to gradually decrease in size 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 and the contact with the battery cell 21, thereby reducing damage to the battery cell 21.

[0128] Combine Figures 4 to 10 As shown, in some embodiments of the present application, the cross section is a trapezoidal surface.

[0129] Specifically, the trapezoidal surface is perpendicular to the second direction Y, and the width of the trapezoidal surface along the first direction X toward the battery cell 21 is greater than the width of the trapezoidal surface along the first direction X away from the battery cell 21 .

[0130] By setting the cross-section of the first groove section 4111 to a trapezoidal surface, and the size of the trapezoidal surface gradually decreasing 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 contact with the battery cell 21, thereby reducing damage to the battery cell 21.

[0131] Combine Figures 4 to 10 As shown, in some embodiments of the present application, along the first direction X, the size of the first slot segment 4111 is greater than or equal to 15 mm and less than or equal to 30 mm.

[0132] Specifically, along the first direction X, the depth of the first groove section 4111 is greater than or equal to 15 mm and less than or equal to 30 mm. The depth of the first groove section 4111 can be any value between 15 mm, 20 mm, 25 mm, and 30 mm.

[0133] 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, thereby accommodating more mixture and reducing the contact between the accumulated mixture and the battery cell 21 and damage to the battery cell 21.

[0134] Combine Figures 4 to 10 As shown, in some embodiments of the present application, a plurality of battery cells 21 form a plurality of columns of battery cell assemblies 20 arranged along a third direction Z, any column of battery cell assemblies 20 includes a plurality of battery cells 21 arranged along a second direction Y, and the accommodating groove 411 includes a plurality of first groove sections 4111 arranged at intervals along the third direction Z, and the plurality of first groove sections 4111 are arranged in a one-to-one correspondence with the plurality of columns of battery cell assemblies 20 along the first direction X, wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0135] Specifically, the battery device 10 includes multiple battery cell assemblies 20, each of which includes multiple battery cells 21 arranged along the second direction Y, and the multiple battery cell assemblies 20 are spaced apart along the third direction Z. By arranging multiple battery cell assemblies 20 within the accommodating cavity, the capacity of the battery device 10 can be increased. Each column of battery cell assemblies 20 is provided with a corresponding first groove section 4111 along the first direction X, so that when a battery cell 21 in any column of battery cell assemblies 20 experiences thermal runaway, the discharged mixture can be collected by the first groove section 4111. Because there are multiple columns of battery cell assemblies 20, and the multiple columns of battery cell assemblies 20 are spaced apart along the third direction Z, there are also multiple first groove sections 4111, and the multiple first groove sections 4111 are spaced apart along the third direction Z.

[0136] By arranging multiple first groove sections 4111 in a one-to-one correspondence with multiple columns of battery cell assemblies 20 along the first direction X, the mixture discharged from the battery cells 21 in the multiple columns of battery cell assemblies 20 can be collected respectively by the multiple first groove sections 4111, thereby reducing the accumulation of the mixture, and further reducing the conductive connection between the battery cells 21 and the bottom guard plate 41 through the accumulated mixture, thereby improving the reliability of the battery device 10.

[0137] Combine Figures 4 to 10 As shown, in some embodiments of the present application, the accommodating groove 411 further includes a second groove section 4112 , and one end of the plurality of first groove sections 4111 along the second direction Y is respectively connected to the second groove section 4112 .

[0138] Specifically, in order to facilitate the unified collection and discharge of high-temperature and high-pressure gases within the multiple first slot sections 4111 and reduce the number of second pressure relief mechanisms 43, the receiving groove 411 also includes a second slot section 4112, which extends along the third direction Z, and one end of the multiple first slot sections 4111 along the second direction Y is respectively connected to the second slot section 4112. The high-temperature and high-pressure gases within the multiple first slot sections 4111 can be respectively passed through the second slot section 4112 into the receiving groove outside the receiving cavity, and finally discharged to the outside of the box body 30 through the second pressure relief mechanism 43. Among them, the second slot section 4112 can be set inside and outside the receiving cavity. Compared with setting the second slot section 4112 inside the receiving cavity, setting the second slot section 4112 outside the receiving cavity facilitates improving the flatness of the bottom guard plate assembly 40 inside the receiving cavity, thereby facilitating the fitting connection with the battery cell 21. Optionally, the accommodating groove 411 further includes a third groove section 4113, which is disposed outside the accommodating cavity and communicates with the second groove section 4112. The projection of the second pressure relief mechanism 43 along the first direction X is within the projection 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 portion of the first groove section 4111.

[0139] By connecting multiple first groove sections 4111 with the second groove sections 4112 respectively, the high-temperature and high-pressure gases emitted by the battery cells 21 in each column of battery cell assemblies 20 that are in thermal runaway can be respectively passed into the second groove sections 4112 and collected or discharged to the outside of the box 30 through the second groove sections 4112.

[0140] Combine Figures 4 to 11 As shown, in some embodiments of the present application, at least one first slot segment 4111 is provided with a baffle 45 at one end close to the second slot segment 4112 along the second direction Y, and the baffle 45 is connected to the bottom surface of the first slot segment 4111.

[0141] Specifically, the baffle 45 protrudes from the bottom surface of the first slot section 4111. Optionally, the baffle 45 can be stamped from the bottom surface of the first slot section 4111 in a direction close to the battery cell 21. Alternatively, the baffle 45 can be prepared separately and connected to the bottom surface of the first slot section 4111 by bonding or welding.

[0142] By providing the flow blocking block 45 , it is possible to reduce the liquid or solid mixture in the first trough section 4111 from flowing into the second trough section 4112 and causing blockage of the second trough section 4112 .

[0143] Combine 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 section 4111 .

[0144] 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.

[0145] 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 further 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.

[0146] Specifically, the heat exchange plate 50 is provided with a heat exchange cavity for circulating a heat exchange medium. During its flow within the heat exchange cavity, the heat exchange medium can exchange heat with the heat exchange plate 50, thereby regulating the temperature of the heat exchange plate 50. The heat exchange plate 50 also exchanges heat with the battery cells 21, thereby regulating the temperature of the battery cells 21. In some embodiments of the present application, the heat exchange plate 50 is disposed along the first direction X on the side of the bottom guard plate 41 facing away from the battery cells 21. The bottom guard plate 41 may be a metal plate, and the heat exchange plate 50 is connected to the battery cells 21 for heat exchange via the bottom guard plate 41. Optionally, to improve the heat exchange efficiency of the battery cells 21, the portion of the heat exchange plate 50 that provides the heat exchange cavity is bonded to the bottom guard plate 41. Optionally, in some embodiments of the present application, the heat exchange plate 50 may be disposed on the side of the battery cells 21 facing away from the bottom guard plate assembly 40, i.e., disposed between the battery cells 21 and the upper cover 32 along the first direction X.

[0147] By providing the heat exchange plate 50 , the heat exchange plate 50 can cooperate with the battery cell 21 through the bottom guard plate assembly 40 to exchange heat, thereby adjusting the temperature of the battery cell 21 .

[0148] Combine 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.

[0149] 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 multiple first slot sections 4111 extend respectively along the second direction Y and are spaced apart along the third direction Z. Therefore, the multiple heat exchange tubes 51 can extend respectively along the second direction Y and be spaced apart along the third direction Z, with the first slot section 4111 being located between two adjacent heat exchange tubes 51.

[0150] Optionally, the heat exchange plate 50 further includes a first current collector 52 and a second current collector 53 spaced apart along the second direction Y. A plurality of heat exchange tubes 51 are disposed between the first current collector 52 and the second current collector 53 along the second direction Y. The two ends of each heat exchange tube 51 along the second direction Y are respectively connected to the first current collector 52 and the second current collector 53. The first current collector 52 is disposed on a side of the second current collector 53 proximal to the second pressure relief mechanism 43. The first current collector 52 is further provided with a liquid inlet 54 and a liquid outlet 55. The liquid inlet 54 and the liquid outlet 55 each extend outside the accommodating cavity, thereby facilitating connection with external liquid supply and return lines.

[0151] By fitting the heat exchange tube 51 to 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.

[0152] Combine Figures 4 to 12 As shown, in some embodiments of the present application, the box body 30 includes a support frame 31, which 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 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.

[0153] Specifically, the support frame 31 is used to support the bottom guard plate assembly 40 and the battery cells 21, thereby protecting them. The support frame 31 is formed with at least one escape portion 311. The projection of a portion of the accommodating groove 411 along the first direction X is within the projection of the escape portion 311 along the first direction X. That is, the escape portion 311 can be arranged corresponding to the portion of the accommodating groove 411 along the first direction X. Therefore, when the bottom guard plate assembly 40 is placed in the accommodating cavity, the portion of the accommodating groove 411 can be located within the escape portion 311, thereby reducing the overall size of the battery assembly 10 along the first direction X. Optionally, a heat exchange plate 50 can be disposed between the bottom guard plate assembly 40 and the support frame 31, and the heat exchange plate 50 can be connected to the support frame 31.

[0154] By setting up a support frame 31, the support frame 31 can support the bottom guard plate assembly 40 and the battery cell 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 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, which can reduce the overall size of the battery device 10 along the first direction X.

[0155] In a second aspect, the present application provides an electrical device having any one of the battery devices 10 described above.

[0156] like 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.

[0157] 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.

[0158] 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.

[0159] like Figure 13 As shown, in some embodiments of the present application, the electrical equipment may be an energy storage cabinet 2 , which includes a battery device 10 according to any of the above embodiments, and the battery device 10 is used to provide electrical energy to the energy storage cabinet 2 .

[0160] The energy storage cabinet 2 includes a first compartment 71 and a second compartment 72. The battery device 10 is disposed in the first compartment 71, and multiple battery devices 10 are arranged in sequence in the vertical direction and connected to form a battery cluster. The second pressure relief mechanisms 43 of multiple battery devices 10 in the same battery cluster are respectively connected to the same exhaust duct, thereby facilitating the discharge of high-temperature and high-pressure gases in the battery device and reducing the number of connecting pipes. The second compartment 72 is provided with an electronic control component or other accessories, and the user controls the working process of the battery device 10. Optionally, the first compartment 71 and the second compartment 72 can be arranged side by side in the horizontal direction, or the first compartment 71 and the second compartment 72 can be stacked in the vertical direction.

[0161] 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.

[0162] Combine Figures 4 to 11 As shown, in some embodiments of the present application, the battery device 10 includes a box body 30, a bottom guard plate assembly 40 and a plurality of battery cells 21, a receiving cavity is formed inside the box body 30, and the plurality of battery cells 21 are arranged in the receiving cavity, the bottom guard plate assembly 40 is arranged on one side of the plurality of battery cells 21 along the first direction X, and a receiving groove 411 is provided on the surface of the bottom guard plate assembly 40 facing the battery cell 21, and the receiving groove 411 includes at least one first groove section 4111; wherein, 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, 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 section 4111 along the first direction X.

[0163] Optionally, the bottom guard plate assembly 40 is also provided with a second pressure relief mechanism 43. Part of the bottom guard plate assembly 40 extends to the outside of the accommodating cavity and is provided with a partial accommodating groove 411. The second pressure relief mechanism 43 is provided outside the accommodating cavity. The second pressure relief mechanism 43 is configured to relieve pressure in the accommodating groove 411 when the pressure in the accommodating groove 411 is greater than a preset value.

[0164] 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 portion of the receiving groove 411 within the receiving 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 in a direction away from the battery cell 21 to form the receiving groove 411. The sealing plate 42 is disposed on the side of the bottom guard plate 41 facing the battery cell 21 and in contact with the bottom guard plate 41. At least a portion of the sealing plate 42 is disposed outside the receiving cavity and is configured to seal the receiving groove outside the receiving cavity. Another portion of the sealing plate 42 extends into the receiving cavity and is configured to cooperate with the battery cell 21 to seal the receiving groove 411 within the receiving cavity.

[0165] Optionally, the bottom guard plate assembly 40 further includes an insulating layer 44 , which is disposed in the first groove section 4111 and has a melting point greater than or equal to 400° C. The insulating layer 44 is coated with at least one of a PI film layer, an alumina ceramic layer, and a mica layer.

[0166] Optionally, multiple battery cells 21 form multiple columns of battery cell assemblies 20 arranged along a third direction Z. Each column of battery cell assemblies 20 includes multiple battery cells 21 arranged along a second direction Y. The accommodating groove 411 includes multiple first groove sections 4111 spaced apart along the third direction Z. The multiple first groove sections 4111 are arranged in a one-to-one correspondence with the multiple columns of battery cell assemblies 20 along the first direction X. The accommodating groove 411 also includes a second groove section 4112. One end of each first groove section 4111 along the second direction Y is connected to the second groove section 4112. A flow block 45 is provided at one end of each first groove section 4111 along the second direction Y near the second groove section 4112. The flow block 45 is connected to the bottom surface of the first groove section 4111, and the size of the flow block 45 along the first direction X is smaller than the size of the first groove section 4111. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0167] Optionally, the first slot section 4111 extends along the second direction Y, and the first slot section 4111 has a cross section perpendicular to the second direction Y. The cross section is a trapezoidal surface, and the size of the trapezoidal surface gradually decreases in a direction away from the battery cell 21 .

[0168] Optionally, along the first direction X, a size of the first groove section 4111 is greater than or equal to 15 mm and less than or equal to 30 mm.

[0169] Optionally, the battery device 10 further includes a heat exchange plate 50, which is disposed along the first direction X on a side of the bottom guard plate assembly 40 facing away from the battery cells 21. The heat exchange plate 50 exchanges heat with the battery cells 21 through the bottom guard plate 41. The heat exchange plate 50 includes a plurality of heat exchange tubes 51 spaced apart from each other. 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.

[0170] Optionally, the box body 30 includes a support frame 31, which 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 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.

[0171] 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, 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 accommodating cavity; a bottom guard plate assembly, the bottom guard plate assembly being arranged on one side of the plurality of battery cells along a first direction, the bottom guard plate assembly being provided with a receiving groove on a surface facing the battery cells, the receiving groove comprising a plurality of first groove sections arranged in the receiving cavity, the first groove sections extending along a second direction, the receiving groove further comprising a second groove section and a third groove section, the second groove section extending along a third direction, and one end of the plurality of first groove sections along the second direction being respectively connected to the second groove section, a portion of the bottom guard plate assembly extending outside the receiving cavity and being provided with the third groove section, the third groove section being connected to the second groove section, the bottom guard plate assembly comprising a bottom guard plate and a sealing plate, the bottom guard plate being recessed in a direction away from the battery cells to form the receiving groove, the sealing plate being arranged on a side of the bottom guard plate facing the battery cells and being in contact with the bottom guard plate, the sealing plate cover being arranged at openings of the third groove section, the second groove section and a portion of the first groove section, the bottom guard plate assembly further comprising an insulating layer, the insulating layer being arranged in the first groove section, the melting point of the insulating layer being greater than or equal to 400° C. In which, the battery cell is fitted with the bottom guard plate assembly along the first direction, part 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, and each battery cell 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 battery cells along the first direction are respectively within the projection range of the same first groove section along the first direction, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The battery device according to claim 1, wherein: The bottom guard plate assembly is also provided with a second pressure relief mechanism, which is arranged outside the accommodating cavity. The second pressure relief mechanism is configured to relieve pressure in the accommodating tank when the pressure in the accommodating tank is greater than a preset value.

3. The battery device according to claim 1 or 2, characterized in that The insulating layer includes at least one of a PI film layer, an alumina ceramic layer and a mica layer.

4. The battery device according to claim 1 or 2, characterized in that: The first groove section has a cross section perpendicular to the second direction, and a dimension of the cross section gradually decreases along a direction away from the battery cell.

5. The battery device according to claim 4, characterized in that The cross section is a trapezoidal surface.

6. The battery device according to claim 1 or 2, 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.

7. The battery device according to claim 1 or 2, characterized in that: The plurality of battery cells form a plurality of columns of battery cell assemblies arranged along the third direction, any column of the battery cell assemblies includes a plurality of the battery cells arranged along the 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 corresponding to the plurality of columns of the battery cell assemblies along the first direction.

8. The battery device according to claim 7, characterized in that At least one of the first slot sections is provided with a flow blocking block at one end thereof close to the second slot section along the second direction, and the flow blocking block is connected to the bottom surface of the first slot section.

9. The battery device according to claim 8, characterized in that The size of the baffle block along the first direction is smaller than the size of the first slot segment.

10. The battery device according to claim 1 or 2, characterized in that: The battery device further includes 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. The heat exchange plate cooperates with the battery cell for heat exchange through the bottom guard plate assembly.

11. The battery device according to claim 10, 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.

12. The battery device according to claim 1 or 2, characterized in that: The box body includes a support frame, which is arranged on the side of the bottom guard plate assembly away from the battery cell along the first direction. 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.

13. An electrical device, characterized in that: A battery device according to any one of claims 1 to 12.

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