Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a box body and a plurality of battery monomers accommodated in the box body, the box body comprises a bottom plate and a protection plate, the bottom plate comprises a first plate body and a first concave part formed by sinking the first plate body towards one side surface of the battery monomers, first through holes are formed in the bottom walls of the first concave parts, the multiple first concave parts are arranged at intervals in the first direction, and the first direction intersects with the thickness direction of the first plate body. The protection plate is located on the side, away from the battery single bodies, of the bottom plate, and the protection plate and the bottom plate jointly define an exhaust space communicated with the first through hole. And the projection of the pressure relief mechanism of the battery monomer and the first plate body in the thickness direction is overlapped with the projection of the first through hole in the thickness direction of the first plate body.

Description

Technical Field

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

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a research direction in battery technology. Utility Model Content

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

[0005] On the one hand, an embodiment of the present application provides a battery device, which includes a box body and a plurality of battery cells contained in the box body, the box body includes a bottom plate and a protective plate, the bottom plate includes a first plate body and a first recessed portion formed by a surface depression of the first plate body on one side facing the battery cell, the bottom wall of the first recessed portion is provided with a first through hole, and the plurality of first recesses are arranged at intervals in a first direction, and the first direction intersects with the thickness direction of the first plate body. The protective plate is located on the side of the bottom plate away from the battery cell, and the protective plate and the bottom plate are jointly enclosed to form an exhaust space connected to the first through hole. The projection of the pressure relief mechanism of the battery cell in the thickness direction of the first plate body overlaps with the projection of the first through hole in the thickness direction of the first plate body.

[0006] In the above scheme, by setting the first recess and the first through hole on the bottom plate, and making the bottom plate and the protective plate together enclose to form an exhaust space, the high-temperature gas generated by the battery cell can enter the first recess and move into the exhaust space through the first through hole, thereby leaving the area where the battery cell is located and finally leaving the inside of the box, thereby meeting the exhaust needs of the battery device. Furthermore, the embodiment of the present application also arranges multiple first recesses at intervals in the first direction, so that the side walls of the first recesses in the first direction can block the high-temperature gas, thereby providing an independent channel for the exhaust of the high-temperature gas, preventing the high-temperature gas from moving to different recesses, reducing the adverse effects of the high-temperature gas on the battery cell, and improving the reliability of the battery device.

[0007] In some embodiments, the protective plate includes a second plate body and a first flange structure protruding from the second plate body toward the battery cell side, and the first plate body is located on the side of the first flange structure away from the second plate body. The projection of the first recess in the thickness direction of the first plate body is located within the projection of the second plate body in the thickness direction of the first plate body, and the bottom wall is spaced apart from the second plate body in the thickness direction of the first plate body.

[0008] In the above scheme, by providing the protective plate with a first flange structure, the first flange structure can play a certain supporting role on the bottom plate, and at the same time, at least part of the structure in the bottom plate and the protective plate can be spaced apart from each other to form an exhaust space. On this basis, the bottom wall is also spaced apart from the second plate body, so that when the battery cell has thermal runaway and generates high-temperature gas, the high-temperature gas can enter the gap space formed by the bottom wall and the second plate body through the first through hole, thereby realizing the need to transfer the high-temperature gas to the exhaust space.

[0009] In some embodiments, the bottom plate includes a first protrusion protruding from a side of the first plate body away from the battery cell, and the first protrusion is recessed toward a side of the battery cell to form a first recess.

[0010] In the above scheme, by providing a first protrusion in the bottom plate and defining a first recess at the first protrusion, the first recess can have a certain depth dimension in the thickness direction of the first plate body, thereby improving the insulation effect of the first recess on the high-temperature gas and reducing the risk of high-temperature gas moving in adjacent first recesses. At the same time, the design of the first protrusion also helps to improve the structural strength of the bottom plate at the position of the first recess, reduce the risk of deformation of the bottom plate due to external forces and other factors, and improve the structural reliability and use reliability of the battery device.

[0011] In some embodiments, the first protrusion and the first plate body are an integral structure, and the first protrusion is bent and connected to the first plate body.

[0012] In the above solution, the first protrusion and the first plate body are set as an integral structure, so that the bottom plate can be formed by a stamping process, thereby reducing the difficulty and cost of preparing the bottom plate. At the same time, the multiple first recesses formed by this design can isolate the high-temperature gas from each other to improve the reliability of the battery device. In addition, the first protrusion formed in this way will not increase the weight of the bottom plate, which helps to achieve a lightweight design of the battery device.

[0013] In addition, the provision of the first protrusion can also improve the structural strength of the bottom plate itself, reduce the risk of deformation or even cracking of the bottom plate due to external forces, and improve the structural reliability of the battery device.

[0014] In some embodiments, the box body further comprises a plurality of side beams disposed on a side of the bottom plate facing the battery cell, the plurality of side beams surround the battery cell, and the plurality of side beams comprises a first side beam disposed on a side of the battery cell along a first direction, wherein the first side beam has an exhaust passage connecting the outside of the box body and the exhaust space.

[0015] In the above scheme, an exhaust channel is arranged on the first side beam, and the exhaust channel can realize the connection between the outside of the box and the exhaust space. When the high-temperature gas enters the exhaust space, the temperature and pressure are greatly reduced. At this time, the high-temperature gas is discharged to the outside of the box through the exhaust channel along the flow path with the least resistance, thereby reducing the adverse effects of the high-temperature gas on the battery device and improving the reliability of the battery device.

[0016] In some embodiments, the exhaust channel includes an exhaust hole formed by a depression on a side surface of the first side beam facing away from the battery cell, and a first channel formed by a depression on a side surface of the first side beam facing the bottom plate, and the first channel connects the exhaust hole and the exhaust space.

[0017] In the above scheme, the exhaust channel includes an exhaust hole connected to the external environment of the box body, and a first channel for connecting the exhaust hole and the exhaust space. The exhaust hole and the first channel cooperate with each other to achieve the discharge of high-temperature gas, thereby improving the reliability of the battery device.

[0018] In some embodiments, the bottom plate has a first edge in the first direction, the protective plate has a second edge in the first direction, and the first edge and the second edge are both arranged flush with a surface of a side of the first side beam away from the battery cell. The first plate body is provided with a second through hole, and the second through hole connects the first channel and the exhaust space.

[0019] In the above scheme, by arranging the first edge and the second edge flush with the surface of the side of the first side beam away from the battery cell, the bottom plate and the protective plate can both play a supporting effect on the first side beam, and help reduce the difficulty of positioning the bottom plate, the protective plate and the first side beam during installation, thereby improving the structural reliability of the battery device. At the same time, a second through hole is arranged on the bottom plate, and the second through hole can realize the communication between the exhaust channel and the exhaust space to meet the exhaust needs of the battery device.

[0020] In some embodiments, the first side beam includes a first portion and a second portion located on a side of the first portion away from the bottom plate, the first portion is arranged beyond the second portion in a first direction and toward the surface of the battery cell. The first channel includes a first subsection located in the first portion, and a second subsection located in the second portion, the exhaust hole is located in the second portion and connected to the second subsection, and the size of the first subsection in the first direction is larger than the size of the second subsection in the first direction.

[0021] In the above scheme, in view of the fact that the first part and the second part have different sizes in the first direction, the size of the first sub-segment in the first direction is set to be larger than the size of the second sub-segment in the first direction, so that the sizes of the first sub-segment and the second sub-segment in the first direction can be respectively adapted to the sizes of the first part and the second part in the first direction, and the larger size of the first sub-segment in the first direction can reduce the overall weight of the second side beam, which helps to achieve a lightweight design of the battery device.

[0022] In some embodiments, a plurality of first through holes corresponding to a single first recess are spaced apart along the second direction, the first recess has a first side wall in the second direction, and the first direction, the second direction and the thickness direction of the first plate body intersect each other.

[0023] In the above solution, the first recess has a first side wall in the second direction, that is, the first recess is not completely penetrated in the second direction, and one end of different first recesses in the second direction will not be connected and converged with each other. This design helps to further isolate different first recesses, so that when some battery cells have thermal runaway, the risk of high-temperature gas moving to other battery cells is further reduced, thereby improving the reliability of the battery device.

[0024] In some embodiments, the bottom plate further includes a second protrusion protruding from a side of the first plate body away from the battery cell, and the second protrusion is located on one side of the battery cell along the first direction.

[0025] In the above solution, by adding the second protrusion, the structural strength of the bottom plate can be improved and the risk of deformation of the bottom plate can be reduced. Furthermore, the second protrusion protrudes from the side of the first plate away from the battery cell, that is, the existence of the second protrusion does not occupy the space where the battery cell is located in the box, thereby reducing the impact of the second protrusion on the corresponding space utilization of the battery device, which helps to reduce the overall size of the battery device.

[0026] In some embodiments, the second protrusion and the first plate body are an integral structure, and the second protrusion is bent and connected to the first plate body.

[0027] In the above solution, the presence of the second protrusion helps to improve the structural strength of the bottom plate and reduce the risk of deformation of the bottom plate. On this basis, by setting the second protrusion and the first plate body as an integral structure, the bottom plate can be formed by a stamping process, thereby reducing the difficulty and cost of preparing the bottom plate, and the second protrusion formed in this way will not increase the weight of the bottom plate, which helps to achieve a lightweight design of the battery device.

[0028] In some embodiments, the box body also includes a supporting plate arranged on the side of the bottom plate facing the battery cell, the supporting plate includes a third plate body located between the battery cell and the bottom plate, the third plate body includes a first main body portion and a first weak portion, and the projection of the first weak portion in the thickness direction of the first plate body overlaps with the projection of the pressure relief mechanism in the thickness direction.

[0029] In the above scheme, the third plate body in the supporting plate can be in direct contact with the battery cells, and at the same time, a plurality of first weak parts are arranged on the third plate body for corresponding to the pressure relief mechanism of the plurality of battery cells. In this way, when some battery cells have thermal runaway, the corresponding first weak parts can be actuated and provide them with independent exhaust channels and connect to the first recessed parts, and move into the exhaust space with the help of the first through hole of the first recessed parts. In this way, the mutual cooperation between the bottom plate and the supporting plate helps to further reduce the adverse effects of thermal runaway of some battery cells on other battery cells, thereby improving the reliability of the battery device.

[0030] In some embodiments, the first body portion includes a fiber material and a resin material, and the first weak portion includes a resin material and does not include a fiber material.

[0031] In the above scheme, by setting the first main body portion to include fiber material and resin material, and the first weak portion to include resin material but not fiber material, a supporting plate can be prepared by a process with higher molding efficiency, and this design can reduce the weight of the supporting plate while meeting the insulation requirements of the supporting plate, which helps to meet the lightweight requirements of the battery device.

[0032] In some embodiments, the supporting plate further includes a second flange structure protruding from the side of the third plate body away from the bottom plate, the second flange structure is connected to the peripheral edge of the third plate body, and is arranged to cover the surface of the side beam away from the bottom plate.

[0033] In the above scheme, by arranging a second flange structure on the bearing plate and overlapping the second flange structure with the side beam, the contact and cooperation between the second flange structure and the side beam can be used to fix the position of the two, thereby improving the reliability of the overall structure of the box.

[0034] In some embodiments, the box body also includes a heat insulation plate arranged between the bottom plate and the second plate body, the heat insulation plate includes a second main body portion and a second weak portion, and the projection of the second weak portion in the thickness direction overlaps with the projection of the pressure relief mechanism in the thickness direction.

[0035] In the above scheme, a heat insulation plate can be added between the bottom plate and the protective plate, so that the risk of the bottom plate and the protective plate being melted through by high-temperature and high-pressure gas can be reduced by means of the heat insulation plate, thereby improving the reliability of the battery device. At the same time, a second weak portion is provided on the heat insulation plate, which can be actuated under the action of high-temperature gas and generate a corresponding exhaust channel to meet the exhaust needs of the battery device.

[0036] In some embodiments, a distance between adjacent first recesses in the first direction is L, and L satisfies: 10 mm≤L≤30 mm.

[0037] In the above scheme, by setting the spacing L to be no less than 10 mm, a larger spacing can be provided between adjacent first recesses, thereby reducing the risk of high temperature gas moving in adjacent first recesses, and at the same time, a first plate of a certain size can be provided between adjacent first recesses, thereby improving the supporting effect on the battery cell. In addition, the spacing L is set to be no more than 30 mm, thereby meeting the compact arrangement requirements of multiple battery cells, helping to improve the space utilization rate in the battery device and reducing the overall size of the battery device.

[0038] In a second aspect, an embodiment of the present application provides an electrical device, which includes a battery device in any of the aforementioned embodiments.

[0039] 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

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of the present application;

[0042] Figure 2 is an exploded structural diagram of a box in a battery device provided in some embodiments of the present application;

[0043] Figure 3 is a top view of a box in a battery device provided in some embodiments of the present application;

[0044] Figure 4is a cross-sectional structural diagram of a box in a battery device provided in some embodiments of the present application;

[0045] Figure 5 is a schematic diagram of a cross-sectional structure of a battery device provided in some embodiments of the present application;

[0046] Figure 6 yes Figure 3 Schematic diagram of the enlarged structure at the middle area Q;

[0047] Figure 7 It is an exploded structural diagram of a box in a battery device provided in some embodiments of the present application.

[0048] Tag Name:

[0049] Vehicle 1000; battery device 100; controller 200; motor 300; housing 400; battery cell 500;

[0050] Bottom plate 10; first plate body 11; second through hole 111; first recess 12; bottom wall 121; first side wall 122; first through hole 13; first protrusion 14; second protrusion 15; second recess 16;

[0051] Protective plate 20; second plate body 21; first flange structure 22;

[0052] First side beam 31; first portion 311; second portion 312; second side beam 32;

[0053] The bearing plate 40; the third plate body 41; the first main body portion 411; the first weak portion 412; the second flange structure 42;

[0054] Heat insulation board 50; second main body portion 51; second weak portion 52;

[0055] Exhaust space R1; exhaust channel R2; exhaust hole R21; first channel R22; first subsection R221; second subsection R222;

[0056] first edge E1; second edge E2;

[0057] First direction X, second direction Y; thickness direction Z; DETAILED DESCRIPTION

[0058] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0060] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0061] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0062] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0063] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0064] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), which means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0065] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0066] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0067] 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, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0068] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection 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 embodiments of the present application can be understood according to the specific circumstances.

[0069] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0070] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0071] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0072] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0073] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0074] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0075] 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.

[0076] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0077] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0078] 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.

[0079] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0080] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0081] The battery device includes a battery cell, and a pressure relief mechanism is provided on the outer shell of the battery cell. Taking the vehicle as an example, in order to reduce the impact of thermal runaway of the battery cell on the floor, the pressure relief mechanism can adopt an inverted packaging scheme, that is, the pressure relief mechanism is located on the wall surface of the outer shell away from the floor. In this way, when the battery cell thermal runaway occurs, the high-temperature gas can be emitted from the bottom of the battery cell, that is, the side away from the floor and leave the battery cell, thereby reducing the adverse impact on the vehicle.

[0082] There are usually multiple battery cells in a battery device. When some battery cells experience thermal runaway and generate high-temperature gas, if no corresponding exhaust channel is provided, the high-temperature gas will easily move to the locations of other adjacent battery cells and have an adverse effect on other battery cells, thereby affecting the reliability of the battery device.

[0083] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0084] The battery device described in the embodiments of the present application is not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are all described using electric vehicles as examples.

[0085] See also Figure 1 , Figure 1 It is a structural schematic diagram of a vehicle provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 may be provided inside the vehicle 1000, and specifically, for example, a battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used, for example, to control the battery to power the motor 300. The battery device 100 may be used for starting and navigating the vehicle 1000, and of course, the battery device 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0086] Next, the structure of the battery device 100 will be described in detail in conjunction with the accompanying drawings in the embodiment of the present application.

[0087] See also Figures 1 to 5 The battery device 100 includes a box body 400 and a plurality of battery cells 500 contained in the box body 400. The box body 400 includes a bottom plate 10 and a protective plate 20. The bottom plate 10 includes a first plate body 11 and a first recess 12 formed by a surface of the first plate body 11 facing the battery cell 500. The bottom wall 121 of the first recess 12 is provided with a first through hole 13. The plurality of first recesses 12 are arranged at intervals in a first direction X, and the first direction X intersects with a thickness direction Z of the first plate body 11. The protective plate 20 is located on a side of the bottom plate 10 away from the battery cell 500. The protective plate 20 and the bottom plate 10 are jointly enclosed to form an exhaust space R1 connected to the first through hole 13. The projection of the pressure relief mechanism of the battery cell 500 on the thickness direction Z of the first plate body 11 overlaps with the projection of the first through hole 13 on the thickness direction Z of the first plate body 11.

[0088] The battery cell 500 is the main component for providing electric energy in the battery device 100. In the battery device 100, there may be multiple battery cells 500, and the multiple battery cells 500 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 500 are both connected in series and in parallel. The multiple battery cells 500 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 500 is accommodated in the box 400; of course, multiple battery cells 500 may be first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 400.

[0089] The battery cell 500 includes a pressure relief mechanism, which refers to an element or component that is activated to release the internal pressure or temperature of the battery cell 500 when the internal pressure or temperature reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and separator in the battery cell 500. The internal pressure of the battery cell 500 is the pressure inside the shell.

[0090] The pressure relief mechanism may be in the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically be a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell 500 reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak portion provided in the pressure relief mechanism ruptures, thereby forming an opening or channel for internal pressure relief. The weak portion may be formed by providing a notch, a groove or a material with a relatively low strength.

[0091] The "actuation" mentioned in this application means that the pressure relief mechanism is in action or activated to a certain state, so that the internal pressure of the battery cell 500 can be released. The action produced by the pressure relief mechanism may include but is not limited to: at least a part of the pressure relief mechanism is ruptured, broken, torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 500 will be discharged from the actuated part as emissions. In this way, the battery cell 500 can be depressurized under controllable pressure, thereby avoiding potential more serious accidents.

[0092] The emissions from the battery cells 500 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases produced by the reaction, flames, and the like.

[0093] The box 400 is a component structure in the battery device 100 for accommodating and protecting the battery cell 500. The bottom plate 10 is a plate-shaped structure for constituting the box 400. In a vehicle, the bottom plate 10 is usually located on the side of the battery cell 500 away from the floor. Exemplarily, the box 400 also includes a top cover, and the top cover and the bottom plate 10 are respectively arranged on both sides of the battery cell 500. According to different actual needs, other component structures can be arranged between the bottom plate 10 and the battery cell 500, or the bottom plate 10 can also be directly arranged in contact with the battery cell 500.

[0094] The bottom plate 10 includes a first plate body 11 and a first recess 12. The first plate body 11 is a main component of the bottom plate 10. The first recess 12 is formed by the first plate body 11 being recessed inwardly toward the surface of the battery cell 500. The first recess 12 can be formed in a variety of ways, for example, by a cutting process such as grooving, or by a stamping process.

[0095] The bottom wall 121 is a wall structure located at one side of the first recess 12 along the thickness direction Z of the first plate body 11 and used to enclose and form the first recess 12. The bottom wall 121 is usually spaced a certain distance from the battery cell 500 in the thickness direction Z of the first plate body 11. The bottom wall 121 is provided with a first through hole 13, which is provided through the bottom wall 121 along the thickness direction Z of the first plate body 11.

[0096] The projection of the pressure relief mechanism of the battery cell 500 on the thickness direction Z of the first plate body 11 overlaps with the projection of the first through hole 13 on the thickness direction Z of the first plate body 11. The "projection on the thickness direction Z" mentioned here refers to the orthographic projection on any plane perpendicular to the thickness direction Z of the first plate body 11, that is, the first through hole 13 is arranged corresponding to the position of the pressure relief mechanism. Furthermore, the number and arrangement of the first through holes 13 can correspond to the number and arrangement of the battery cells 500, and a single first recess 12 can be provided with multiple first through holes 13 arranged at intervals. Among them, Figure 5 FIG. 4 shows the relative positional relationship between a portion of the first through holes 13 at a single first recess 12 and the battery cell 500 .

[0097] The protective plate 20 is a structure used in the box body 400 for protection. The protective plate 20 is located on the side of the bottom plate 10 away from the battery cell 500. The protective plate 20 and the bottom plate 10 can cooperate with each other and enclose an exhaust space R1. The exhaust space R1 is a spatial structure that can meet the needs of high-temperature gas movement. The exhaust space R1 is connected to the first through hole 13. In this way, when the battery cell 500 has thermal runaway, the high-temperature gas can enter the first recess 12 and enter the exhaust space R1 through the first through hole 13, and then move away from the area where the battery cell 500 is located through the exhaust space R1, and finally leave the inside of the box body 400, thereby meeting the exhaust requirements of the battery device 100.

[0098] It should be noted that the exhaust space R1 formed by the protective plate 20 and the bottom plate 10 can have various forms. For example, the exhaust space R1 can be a relatively large cavity structure and can be connected to multiple first through holes 13. Alternatively, the exhaust space R1 can be provided with multiple exhaust pipelines isolated from each other, and different exhaust pipelines are connected to different first through holes 13, respectively.

[0099] Furthermore, in order to reduce the adverse effects of high-temperature gas on the battery cells 500, the embodiment of the present application also restricts the arrangement of the first recesses 12. Specifically, a plurality of first recesses 12 are arranged at intervals in the first direction X, and optionally, the first direction X is arranged perpendicular to the thickness direction Z of the first plate 11. Since different first recesses 12 are spaced apart from each other, the side walls of the first recesses 12 in the first direction X will block the high-temperature gas from moving between different first recesses 12, so that the high-temperature gas can be blocked from moving to the area where other battery cells 500 are located with the help of the side walls, thereby reducing the adverse effects of high-temperature gas on the battery cells 500 and improving the reliability of the battery device 100.

[0100] In summary, in the embodiment of the present application, by providing the first recess 12 and the first through hole 13 on the bottom plate 10, and making the bottom plate 10 and the protective plate 20 jointly enclose the exhaust space R1, the high-temperature gas generated by the battery cell 500 can enter the first recess 12 and move to the exhaust space R1 through the first through hole 13, thereby leaving the area where the battery cell 500 is located and finally leaving the inside of the box 400, thereby meeting the exhaust needs of the battery device 100. Furthermore, in the embodiment of the present application, multiple first recesses 12 are arranged at intervals in the first direction X, so that the side walls of the first recess 12 in the first direction X can block the high-temperature gas, thereby providing an independent channel for the exhaust of the high-temperature gas, preventing the high-temperature gas from moving to different recesses, reducing the adverse effects of the high-temperature gas on the battery cell 500, and improving the reliability of the battery device 100.

[0101] In some optional embodiments, a plurality of first through holes 13 are disposed in a single first recess 12, and the base plate 10 further includes a blocking portion disposed in the first recess 12 and located between adjacent first through holes 13. The presence of the blocking portion can further reduce the risk of high-temperature gas moving between different battery cells 500, thereby improving the reliability of the battery device 100.

[0102] In some embodiments, Figures 1 to 5 As shown, the protective plate 20 includes a second plate body 21 and a first flange structure 22 protruding from the second plate body 21 toward the battery cell 500, and the first plate body 11 is located on the side of the first flange structure 22 away from the second plate body 21. The projection of the first recess 12 in the thickness direction Z of the first plate body 11 is located within the projection of the second plate body 21 in the thickness direction Z of the first plate body 11, and the bottom wall 121 is spaced apart from the second plate body 21 in the thickness direction Z of the first plate body 11.

[0103] The second plate body 21 is the main component of the protective plate 20. The first flange structure 22 is a flange structure arranged at the edge of the second plate body 21 and protruding relative to the second plate body 21. The "flanged structure" mentioned here refers to: a straight wall or flange structure protruding from the edge of the second plate body 21 and having a certain angle.

[0104] The first plate body 11 is located on the side of the first flange structure 22 away from the second plate body 21. The first flange structure 22 can provide support for the first plate body 11 and make the first plate body 11 and the second plate body 21 spaced apart in the thickness direction Z of the first plate body 11 so as to form the exhaust space R1. The first plate body 11 and the second plate body 21 can be connected as a whole by welding and bonding, or the first plate body 11 and the second plate body 21 can also be only in contact with each other without being connected to each other.

[0105] Furthermore, in addition to the first plate body 11 and the second plate body 21 being spaced apart from each other, the bottom wall 121 is also spaced apart from the second plate body 21. On this basis, the gap space formed by the bottom wall 121 and the second plate body 21 also belongs to part of the space in the exhaust space R1, and the gap space can be connected with the space between the first plate body 11 and the second plate body 21.

[0106] In summary, in the embodiment of the present application, by providing the protective plate 20 with the first flange structure 22, the first flange structure 22 can play a certain supporting role on the bottom plate 10, and at the same time, at least part of the structure of the bottom plate 10 and the protective plate 20 can be spaced apart from each other to form the exhaust space R1. On this basis, the bottom wall 121 is also spaced apart from the second plate body 21, so that when the battery cell 500 has thermal runaway and generates high-temperature gas, the high-temperature gas can enter the gap space formed by the bottom wall 121 and the second plate body 21 through the first through hole 13, so as to achieve the need to transfer the high-temperature gas to the exhaust space R1.

[0107] In some embodiments, Figures 1 to 5 As shown, the bottom plate 10 includes a first protrusion 14 protruding from a side of the first plate body 11 away from the battery cell 500 , and the first protrusion 14 is recessed toward a side of the battery cell 500 to form a first recess 12 .

[0108] The first protrusion 14 is a structure in the bottom plate 10 for defining the first recess 12. Specifically, the first protrusion 14 protrudes from the surface of the first plate body 11 on the side away from the battery cell 500, that is, the distance between the first protrusion 14 and the second plate body 21 is smaller than the distance between the first plate body 11 and the second plate body 21. There are multiple connection methods between the first protrusion 14 and the first plate body 11. For example, the two can be two independent structures connected and fixed by welding or the like, or the two can be an integrated structure and formed by a stamping process.

[0109] Considering that the thickness of the first plate body 11 itself is usually small, directly grooving the first plate body 11 will have an adverse effect on its structural strength, and the depth of the first recess 12 formed in this way is also small, which makes it difficult to meet the isolation effect of high-temperature gas between adjacent first recesses 12.

[0110] In view of this, the embodiment of the present application provides a first protrusion 14 in the bottom plate 10, and defines a first recess 12 at the first protrusion 14, so that the first recess 12 can have a certain depth dimension in the thickness direction Z of the first plate body 11, thereby improving the insulation effect of the first recess 12 on the high-temperature gas and reducing the risk of the high-temperature gas moving in the adjacent first recess 12. At the same time, the design of the first protrusion 14 also helps to improve the structural strength of the bottom plate 10 at the position of the first recess 12, reduce the risk of deformation of the bottom plate 10 due to external forces and other factors, and improve the structural reliability and use reliability of the battery device 100.

[0111] In some embodiments, the first protrusion 14 and the first plate body 11 are an integral structure, and the first protrusion 14 is bent and connected to the first plate body 11 .

[0112] The first protrusion 14 and the first plate body 11 can be formed by a stamping process. Specifically, during the preparation of the base plate 10, a larger plate-like structure is first prepared, and then a stamping process is performed on a local position of the plate-like structure to form a relatively protruding first protrusion 14. The first protrusion 14 can also be enclosed to form a first recess 12 to meet the exhaust needs of the battery device 100.

[0113] In the embodiment of the present application, the first protrusion 14 and the first plate body 11 are provided as an integral structure, so that the bottom plate 10 can be formed by means of a stamping process, thereby reducing the difficulty and cost of manufacturing the bottom plate 10. At the same time, the multiple first recesses 12 formed by this design can isolate the high-temperature gas from each other to improve the reliability of the battery device 100, and the first protrusion 14 formed in this way will not increase the weight of the bottom plate 10, which helps to achieve a lightweight design of the battery device 100.

[0114] In addition, the provision of the first protrusion 14 can also improve the structural strength of the bottom plate 10 itself, reduce the risk of deformation or even cracking of the bottom plate 10 due to external forces, and improve the structural reliability of the battery device 100.

[0115] In some embodiments, see Figures 1 to 6 The box body 400 further includes a plurality of side beams disposed on the side of the bottom plate 10 facing the battery cell 500, the plurality of side beams surround the battery cell 500, and the plurality of side beams include a first side beam 31 disposed on one side of the battery cell 500 along the first direction X. The first side beam 31 has an exhaust passage R2 connecting the outside of the box body 400 and the exhaust space R1.

[0116] The side beam is a beam structure arranged around the area where the multiple battery cells 500 are located, and the multiple side beams are arranged around the area where the multiple battery cells 500 are located. The first side beam 31 is a beam structure located on one side of the area where the multiple battery cells 500 are located along the first direction X. The first side beam 31 can extend along the second direction Y. The first direction X, the second direction Y, and the thickness direction Z of the first plate body 11 are arranged to intersect each other. Further optionally, the first direction X, the second direction Y, and the thickness direction Z of the first plate body 11 are arranged perpendicularly to each other.

[0117] In some optional embodiments, the first side beam 31 is disposed on a side of the first flange structure 22 facing away from the second plate body 21 , that is, the first side beam 31 can obtain support from the first flange structure 22 .

[0118] The exhaust channel R2 is a channel structure arranged in the first side beam 31, and is used to achieve communication between the outside of the box 400 and the exhaust space R1, wherein the exhaust channel R2 can be directly connected to the exhaust space R1, or the two can also be connected through other channel structures.

[0119] In the embodiment of the present application, an exhaust channel R2 is provided on the first side beam 31, and the exhaust channel R2 can realize the connection between the outside of the box body 400 and the exhaust space R1. When the high-temperature gas enters the exhaust space R1, the temperature and pressure are greatly reduced. At this time, the high-temperature gas is discharged to the outside of the box body 400 through the exhaust channel R2 along the flow path with the least resistance, thereby reducing the adverse effects of the high-temperature gas on the battery device 100 and improving the reliability of the battery device 100.

[0120] In some embodiments, Figure 4 and Figure 5 As shown, the exhaust channel R2 includes an exhaust hole R21 formed by a depression on the side surface of the first side beam 31 away from the battery cell 500, and a first channel R22 formed by a depression on the side surface of the first side beam 31 toward the bottom plate 10, and the first channel R22 connects the exhaust hole R21 and the exhaust space R1.

[0121] The first side beam 31 has two opposite surfaces in the first direction X. The surface facing the battery cell 500 of the two surfaces is used to enclose and form a storage space for accommodating the battery cell 500, while the surface facing away from the battery cell 500 can be in contact with the external environment of the box body 400. On this basis, the exhaust hole R21 is formed by the surface of the first side beam 31 facing away from the battery cell 500, that is, the surface of the first side beam 31 facing the external environment, which is recessed inward, so that the exhaust hole R21 can be connected to the external environment of the box body 400.

[0122] It should be noted that, according to different actual needs, the exhaust hole R21 can be set along the first direction X through the first side beam 31, or the exhaust hole R21 can also be set without penetrating the first side beam 31, that is, the exhaust hole R21 can be a through hole structure, or the exhaust hole R21 can also be a blind hole structure. In addition, according to different actual needs, only one exhaust hole R21 can be set on the first side beam 31, or multiple exhaust holes R21 can be set on the first side beam 31 at the same time. Optionally, multiple exhaust holes R21 are set on the first side beam 31, and the multiple exhaust holes R21 are arranged at intervals along the second direction Y. The design of multiple exhaust holes R21 helps to improve the exhaust efficiency.

[0123] The first side beam 31 also has two opposite surfaces in the thickness direction Z of the first plate body 11. In combination with the above content, it can be known that the exhaust space R1 is formed by the bottom plate 10 and the protective plate 20, and the bottom plate 10 and the protective plate 20 are both located on the same side of the first side beam 31 in the thickness direction Z of the first plate body 11. On this basis, in order to meet the need for communication between the exhaust channel R2 and the exhaust space R1, the embodiment of the present application further forms a first channel R22 by inwardly concavely forming a side surface of the first side beam 31 facing the bottom plate 10, so that the exhaust hole R21 can be connected with the exhaust channel R2 by means of the first channel R22.

[0124] It should be noted that the bottom plate 10 can have a variety of design methods at the position corresponding to the first side beam 31. For example, the bottom plate 10 extends along the first direction X and ends at the position of the first channel R22, that is, the bottom plate 10 only supports part of the structure of the first side beam 31, or the bottom plate 10 may not support the first side beam 31, so that the connection between the first channel R22 and the exhaust space R1 can be achieved.

[0125] Alternatively, in other embodiments, the edge of the base plate 10 in the first direction X, the edge of the protective plate 20 in the first direction X, and the surface of the first side beam 31 on the side facing away from the battery cell 500 in the first direction X can be arranged flush. In this case, a through-hole structure is required to be provided at the base plate 10 at the corresponding position of the first channel R22, so as to meet the connection requirement between the first channel R22 and the exhaust space R1.

[0126] In the embodiment of the present application, the exhaust channel R2 includes an exhaust hole R21 connected to the external environment of the box body 400, and a first channel R22 for connecting the exhaust hole R21 and the exhaust space R1. The exhaust hole R21 and the first channel R22 cooperate with each other to achieve the discharge of high-temperature gas, thereby improving the reliability of the battery device 100.

[0127] In some embodiments, Figures 1 to 5 As shown, the bottom plate 10 has a first edge E1 in the first direction X, and the protective plate 20 has a second edge E2 in the first direction X. The first edge E1 and the second edge E2 are both arranged flush with the surface of the first side beam 31 on the side away from the battery cell 500. The first plate body 11 is provided with a second through hole 111, and the second through hole 111 connects the first channel R22 and the exhaust space R1.

[0128] The first edge E1 is an edge structure of the bottom plate 10 in the first direction X, and the first edge E1 may extend along the second direction Y. Similarly, the second edge E2 is an edge structure of the protective plate 20 in the first direction X, and the second edge E2 may extend along the second direction Y. Optionally, as Figure 2 and Figure 4As shown, the first edge E1 is located on the first plate body 11 , and the second edge E2 is located on the first flange structure 22 .

[0129] The first edge E1 and the second edge E2 are both flush with the surface of the first side beam 31 facing away from the battery cell 500, that is, in the thickness direction Z of the first plate 11, the projections of the first edge E1 and the second edge E2 are both overlapped with the projections of the surface of the first side beam 31 facing away from the battery cell 500, which helps to improve the flatness of the peripheral edge of the battery device 100 and reduce the difficulty of assembling the battery device 100. In addition, the bottom plate 10 and the protective plate 20 can both play a supporting role on the first side beam 31, thereby improving the structural reliability of the battery device 100.

[0130] Furthermore, a second through hole 111 is provided on the first plate body 11, and the second through hole 111 is provided through the first plate body 11 along the thickness direction Z of the first plate body 11, and can connect the exhaust channel R2 and the exhaust space R1. The high-temperature gas in the exhaust space R1 can pass through the second channel, the first channel R22 and the exhaust hole R21 in sequence, and finally move to the outside of the box body 400, thereby meeting the exhaust needs of the battery device 100.

[0131] In summary, in the embodiment of the present application, by arranging the first edge E1 and the second edge E2 flush with the surface of the first side beam 31 facing away from the battery cell 500, the bottom plate 10 and the protective plate 20 can both play a supporting effect on the first side beam 31, and help reduce the difficulty of positioning the bottom plate 10, the protective plate 20 and the first side beam 31 during the installation process, thereby improving the structural reliability of the battery device 100. At the same time, the bottom plate 10 is provided with a second through hole 111, which can realize the communication between the exhaust channel R2 and the exhaust space R1 to meet the exhaust needs of the battery device 100.

[0132] In some embodiments, Figure 4 As shown, the first side beam 31 includes a first portion 311 and a second portion 312 located on a side of the first portion 311 away from the bottom plate 10, and the first portion 311 is arranged beyond the second portion 312 in the first direction X and toward the surface of the battery cell 500. The first channel R22 includes a first sub-segment R221 located in the first portion 311, and a second sub-segment R222 located in the second portion 312, the exhaust hole R21 is located in the second portion 312 and communicates with the second sub-segment R222, and the size of the first sub-segment R221 in the first direction X is greater than the size of the second sub-segment R222 in the first direction X.

[0133] The first side beam 31 at least includes a first portion 311 and a second portion 312, wherein the first portion 311 is located on the side of the second portion 312 facing the bottom plate 10, and the first portion 311 and the second portion 312 may be an integral structure. The first portion 311 and the second portion 312 may be arranged flush with each other on surfaces facing away from the battery cell 500, and the first portion 311 is arranged beyond the surface of the second portion 312 facing the battery cell 500 in the first direction X, that is, the size of the second portion 312 in the first direction X is smaller than the size of the first portion 311 in the first direction X, so that the second portion 312 may play a certain role in avoiding other components located inside the box body 400, so that the arrangement of the components located inside the box body 400 is more compact, thereby improving the space utilization rate inside the box body 400.

[0134] In some optional embodiments, the battery device 100 further includes a heat exchange structure located inside the box body 400. The embodiment of the present application reduces the size of the second portion 312 in the first direction X, thereby achieving a certain avoidance effect on the heat exchange structure.

[0135] The first passage R22 includes a first subsection R221 located in the first portion 311, and a second subsection R222 located in the second portion 312. Both ends of the first subsection R221 can be connected to the exhaust space R1 and the second subsection R222, respectively. The second subsection R222 can be connected to the first subsection R221 and the exhaust hole R21, respectively. In this case, the high-temperature gas can be transferred out of the box body 400 through the exhaust space R1, the first subsection R221, the second subsection R222, and the exhaust hole R21 in sequence.

[0136] It should be noted that, according to different actual needs, one or more exhaust holes R21 may be provided. When there are multiple exhaust holes R21, the size and structure of the second sub-segment R222 may be changed so that a single second sub-segment R222 can be connected to multiple exhaust holes R21 at the same time, or multiple second sub-segments R222 may be provided, and the multiple second sub-segments R222 are respectively connected to the multiple exhaust holes R21. Optionally, the first side beam 31 includes multiple exhaust holes R21 arranged side by side in the second direction Y, and the second sub-segment R222 has a certain extension size in the second direction Y, and is connected to the multiple exhaust holes R21 at the same time.

[0137] Furthermore, in the embodiment of the present application, in view of the fact that the first part 311 and the second part 312 have different sizes in the first direction X, the size of the first sub-segment R221 in the first direction X is set to be larger than the size of the second field in the first direction X, so that the sizes of the first sub-segment R221 and the second sub-segment R222 in the first direction X can be respectively adapted to the sizes of the first part 311 and the second part 312 in the first direction X, and the larger size of the first sub-segment R221 in the first direction X can reduce the overall weight of the second side beam 32, which helps to achieve a lightweight design of the battery device 100.

[0138] It should be noted that the “size of the first sub-segment R221 in the first direction X” mentioned in the embodiment of the present application refers to the overall size of the first sub-segment R221 in the first direction X, where Figure 4 The size of the partial structure of the first sub-segment R221 close to the second sub-segment R222 in the first direction X may be the same as the size of the second sub-segment R222 in the first direction X.

[0139] In some embodiments, Figure 2 As shown, a plurality of first through holes 13 corresponding to a single first recess 12 are spaced apart along the second direction Y, the first recess 12 has a first side wall 122 in the second direction Y, and the first direction X, the second direction Y and the thickness direction Z of the first plate body 11 intersect each other.

[0140] The first direction X is the arrangement direction of the plurality of first recesses 12, and the second direction Y may be the extension direction of a single first recess 12, and the plurality of first through holes 13 corresponding to the single first recess 12 may also be arranged at intervals along the second direction Y. Optionally, the plurality of battery cells 500 may be arranged in an array along the first direction X and the second direction Y.

[0141] Furthermore, in the embodiment of the present application, the first recess 12 has a first side wall 122 in the second direction Y, that is, the first recess 12 is not completely penetrated in the second direction Y, and one end of different first recesses 12 in the second direction Y will not be connected and converged with each other. This design helps to further isolate different first recesses 12, so that when some battery cells 500 have thermal runaway, the risk of high-temperature gas moving to other battery cells 500 is further reduced, thereby improving the reliability of the battery device 100.

[0142] In some optional embodiments, the plurality of side beams include a second side beam 32 disposed on one side of the battery cell 500 along the second direction Y, and a portion of the structure in the first plate body 11 is located on a side of the first side wall 122 away from the first recess 12 along the second direction Y, and supports the second side beam 32. There may be two second side beams 32, and the distance between the two second side beams 32 in the second direction Y may be greater than or equal to the size of the first recess 12 in the second direction Y.

[0143] In some embodiments, Figures 1 to 5 As shown, the bottom plate 10 further includes a second protrusion 15 protruding from a side of the first plate body 11 away from the battery cell 500 . The second protrusion 15 is located along the first direction X on one side of the battery cell 500 .

[0144] The second protrusion 15 is a partial structure protruding from the first plate body 11. The second protrusion 15 is staggered with the battery cell 500. Specifically, the projection of the second protrusion 15 in the thickness direction Z of the first plate body 11 is located outside the projection of the battery cell 500 in the thickness direction Z of the first plate body 11. The existence of the second protrusion 15 can enhance the structural strength of the bottom plate 10, so as to reduce the risk of deformation of the bottom plate 10 under the influence of external forces and other factors.

[0145] The embodiment of the present application increases the structural strength of the bottom plate 10 and reduces the risk of deformation of the bottom plate 10 by adding the second protrusion 15. Furthermore, the second protrusion 15 protrudes from the side of the first plate 11 away from the battery cell 500, that is, the existence of the second protrusion 15 does not occupy the space where the battery cell 500 is located in the box 400, thereby reducing the influence of the second protrusion 15 on the corresponding space utilization of the battery device 100, which helps to reduce the overall size of the battery device 100.

[0146] In some embodiments, the second protrusion 15 and the first plate body 11 are an integral structure, and the second protrusion 15 is bent and connected to the first plate body 11 .

[0147] The second protrusion 15 and the first plate body 11 can be formed by a stamping process. Specifically, during the preparation of the bottom plate 10, a relatively large plate-like structure is first prepared, and then a stamping process is performed on a local position of the plate-like structure, so that a relatively protruding second protrusion 15 can be formed, and the second protrusion 15 can also enclose a second recess 16. Unlike the first recess 12, the second recess 16 is not provided corresponding to the battery cell 500, and the second recess 16 is not provided with a through-hole structure for connecting the exhaust space R1.

[0148] In the embodiment of the present application, the presence of the second protrusion 15 helps to improve the structural strength of the bottom plate 10 and reduce the risk of deformation of the bottom plate 10. On this basis, by setting the second protrusion 15 and the first plate body 11 as an integral structure, the bottom plate 10 can be formed by a stamping process, thereby reducing the difficulty and cost of preparing the bottom plate 10, and the second protrusion 15 formed in this way will not increase the weight of the bottom plate 10, which helps to achieve a lightweight design of the battery device 100.

[0149] Furthermore, in some optional embodiments, the first recess 12 is formed by enclosing the first protrusion 14, and the first protrusion 14 and the first plate body 11 are an integral structure. Under this design, the first protrusion 14 and the second protrusion 15 can be prepared and formed together in the same stamping process, thereby further simplifying the preparation process of the base plate 10 and reducing the difficulty of preparation.

[0150] In some embodiments, Figure 2 , Figure 4 and Figure 5 As shown, the box body 400 also includes a supporting plate 40 arranged on the side of the bottom plate 10 facing the battery cell 500, the supporting plate 40 includes a third plate body 41 located between the battery cell 500 and the bottom plate 10, the third plate body 41 includes a first main body portion 411 and a first weak portion 412, and the projection of the first weak portion 412 in the thickness direction Z of the first plate body 11 overlaps with the projection of the pressure relief mechanism in the thickness direction Z.

[0151] The supporting plate 40 is a component structure in the box 400 that can directly contact the battery cell 500. The supporting plate 40 can have a variety of material compositions. Optionally, the supporting plate 40 can include non-metallic composite materials. This design can achieve the insulation effect of the supporting plate 40 itself on the one hand, and help achieve the weight reduction effect on the other hand.

[0152] The third plate body 41 is a plate-shaped structure sandwiched between the battery cell 500 and the bottom plate 10 in the carrier plate 40. The first main body 411 is the main component of the third plate body 41. The first weak portion 412 is a structure corresponding to the pressure relief mechanism on the third plate body 41. Similarly, the first weak portion 412 also corresponds to the position of the first through hole 13. Further, the structural strength of the first weak portion 412 is less than that of the first main body 411. Therefore, when the high-temperature gas generated by the battery cell 500 reaches a certain pressure, the high-temperature gas can actuate the first weak portion 412 and move to the first recess 12, and then enter the exhaust space R1 through the first through hole 13, and finally leave the interior of the box 400 from the exhaust channel R2 to achieve the exhaust function.

[0153] It should be noted that the first weak portion 412 can have various forms. For example, the first weak portion 412 can be formed by setting a notch or thinning. Optionally, the thickness of the first weak portion 412 is less than the thickness of the first body portion 411, and the thickness of the first weak portion 412 is H, and H satisfies: 0.1mm≤H≤0.5mm. Further optionally, H is one of 0.1mm, 0.2mm, 0.25mm, 0.4mm and 0.5mm.

[0154] Further optionally, the first weak portion 412 is formed by an inward depression on the side of the first main body portion 411 facing the battery cell 500, and the surface of the first weak portion 412 facing the side of the base plate 10 is located in the same plane as the surface of the first main body portion 411 facing the side of the base plate 10, which helps to improve the supporting effect of the base plate 10 on the supporting plate 40.

[0155] In the embodiment of the present application, the third plate body 41 in the supporting plate 40 can be in direct contact with the battery cell 500, and at the same time, a plurality of first weak portions 412 are provided on the third plate body 41 for corresponding to the pressure relief mechanism of the plurality of battery cells 500. In this way, when some of the battery cells 500 have thermal runaway, the corresponding first weak portions 412 can be actuated and provide them with independent exhaust channels R2 and connect to the first recess 12, and move to the exhaust space R1 with the help of the first through hole 13 of the first recess 12. In this way, through the mutual cooperation between the bottom plate 10 and the supporting plate 40, it helps to further reduce the adverse effects of some of the battery cells 500 on other battery cells 500 when thermal runaway occurs, thereby improving the reliability of the battery device 100.

[0156] In some embodiments, the first body portion 411 includes a fiber material and a resin material, and the first weak portion 412 includes a resin material but does not include a fiber material.

[0157] The mixture of fiber material and resin material can be used to manufacture composite materials, wherein the resin material can be used as a base material to bond the reinforcing materials together, and the fiber material can be used as a reinforcing material to give the composite material main mechanical properties. Optionally, the resin material includes but is not limited to polyamide, polypropylene and polyurethane.

[0158] The preparation process of the carrier plate 40 may adopt a resin transfer molding (RTM) process. Specifically, the fiber material is first placed in a closed mold cavity to form a complete and continuous initial structure, and then a hole is dug at the position corresponding to the first weak portion 412 so that the fiber material exists at the first weak portion 412. Then, the resin material is injected into the mold cavity with pressure and solidified, thereby forming the carrier plate 40.

[0159] In this design, since the first weak portion 412 does not contain fiber material compared to the first main body 411 , the first weak portion 412 is thinner than the first main body 411 and is easily actuated by the impact of high-temperature gas, thereby meeting the exhaust requirements of the battery device 100 .

[0160] In the embodiment of the present application, by configuring the first main body portion 411 to include a fiber material and a resin material, and the first weak portion 412 to include a resin material but not a fiber material, a process with a higher molding efficiency can be used to prepare and form the carrier plate 40. This design can reduce the weight of the carrier plate 40 while meeting the insulation requirements of the carrier plate 40, thereby helping to meet the lightweight requirements of the battery device 100.

[0161] In some embodiments, the supporting plate 40 further includes a second flange structure 42 protruding from the side of the third plate body 41 away from the bottom plate 10 . The second flange structure 42 is connected to the peripheral edge of the third plate body 41 and covers the surface of the side beam away from the bottom plate 10 .

[0162] The second flange structure 42 is a partial structure of the load-bearing plate 40 for overlapping the side beam. The second flange structure 42 is arranged on the peripheral side edge of the third plate body 41, and can extend along the surface of the side beam facing the battery cell 500 to the surface of the side beam facing away from the bottom plate 10. In this way, the relative position between the load-bearing plate 40 and the side beam can be fixed by the cooperation and overlap between the second flange structure 42 and the multiple side beams. According to different actual needs, the second flange structure 42 can be connected to the side beam by welding or the like, or the second flange structure 42 and the side beam can also be only contacted and overlapped without being connected to each other.

[0163] It should be noted that the specific shape and size of the second flange structure 42 needs to be determined according to the shape and size of the corresponding side beam. Figure 4 As shown, the first side beam 31 includes a first portion 311 and a second portion 312 located on the side of the first portion 311 away from the bottom plate 10, and the first portion 311 is arranged beyond the second portion 312 in the first direction X and toward the surface of the battery cell 500. On this basis, the part of the second flange structure 42 overlapping with the first side beam 31 needs to be provided with a structure of a step surface, so that the second flange structure 42 can contact with the surface of the part of the first portion 311 that exceeds the second portion 312 away from the bottom plate 10, and can also contact with the surface of the second portion 312 away from the bottom plate 10. The design of the step surface helps to further enhance the overlapping effect between the second flange structure 42 and the first side beam 31, and reduce the risk of the relative position relationship between the two changing.

[0164] In the embodiment of the present application, a second flange structure 42 is provided on the supporting plate 40, and the second flange structure 42 is overlapped with the side beam, so that the contact and cooperation between the second flange structure 42 and the side beam can be utilized to fix the position of the two, thereby improving the reliability of the overall structure of the box body 400.

[0165] In some embodiments, see Figure 7 The box body 400 also includes a heat insulation board 50 arranged between the bottom plate 10 and the second plate body 21, and the heat insulation board 50 includes a second main body portion 51 and a second weak portion 52, and the projection of the second weak portion 52 in the thickness direction Z overlaps with the projection of the pressure relief mechanism in the thickness direction Z.

[0166] The heat insulation board 50 is a component of the box body 400 that includes a high temperature resistant material. The existence of the heat insulation board 50 can reduce the risk of high temperature and high pressure gas melting through the carrier plate 40. Similar to the carrier plate 40, the heat insulation board 50 also includes a second body portion 51 and a second weak portion 52 with different strengths, wherein the second body portion 51 is the main component of the heat insulation board 50, and the second weak portion 52 is a structure on the heat insulation board 50 that corresponds to the pressure relief mechanism. Further, the first weak portion 412, the second weak portion 52 and the first through hole 13 are correspondingly arranged in the projection on the thickness direction Z of the first plate body 11.

[0167] Similar to the first weak portion 412, the second weak portion 52 also has a variety of forms. For example, the second weak portion 52 can be formed by setting a notch or by thinning. Similarly, when the high-temperature gas generated by the battery cell 500 reaches a certain pressure, the high-temperature gas can actuate the second weak portion 52 and move into the first recess 12, and then move into the exhaust space R1 and the exhaust channel R2 in turn, and finally leave the box 400, thereby reducing the risk of gas blockage at the heat insulation board 50 and achieving the exhaust function.

[0168] In addition, the first weak portion 412 and the second weak portion 52 may have a variety of structures, for example, Figure 7 As shown, the projections of the first weak portion 412 and the second weak portion 52 in the thickness direction Z of the first plate body 11 may both be block structures corresponding to the overall shape of the pressure relief mechanism.

[0169] In the embodiment of the present application, a heat insulating plate 50 is added between the bottom plate 10 and the protective plate 20, so that the risk of the bottom plate 10 and the protective plate 20 being melted through by high-temperature and high-pressure gas can be reduced by means of the heat insulating plate 50, thereby improving the reliability of the battery device 100. At the same time, a second weak portion 52 is provided on the heat insulating plate 50, and the second weak portion 52 can be actuated under the action of high-temperature gas and generate a corresponding exhaust channel R2, thereby meeting the exhaust needs of the battery device 100.

[0170] In some embodiments, Figure 6 As shown, the spacing between adjacent first recesses 12 in the first direction X is L, and L satisfies: 10 mm≤L≤30 mm. Optionally, L is one of 10 mm, 15 mm, 20 mm, 25 mm and 30 mm.

[0171] The spacing L between adjacent first recesses 12 in the first direction X is the size of the partial structure of the first plate 11 between adjacent first recesses 12 in the first direction X. On this basis, the embodiment of the present application sets the spacing L to be no less than 10 mm, so that there can be a larger spacing between adjacent first recesses 12, thereby reducing the risk of high-temperature gas moving in adjacent first recesses 12, and also allowing a first plate 11 of a certain size between adjacent first recesses 12, thereby improving the support effect on the battery cell 500. In addition, the spacing L is set to be no more than 30 mm, so as to meet the compact arrangement requirements of multiple battery cells 500, which helps to improve the space utilization rate in the battery device 100 and reduce the overall size of the battery device 100.

[0172] In the second aspect, the embodiment of the present application provides an electric device, which includes the battery device 100 in any of the above embodiments. The electric device provided by the embodiment of the present application has the technical effect of the technical solution of the battery device 100 in any of the above embodiments, and the explanation of the structures and terms that are the same or corresponding to the above embodiments will not be repeated here.

[0173] According to some embodiments of this application, please refer to Figures 1 to 7 The battery device 100 includes a box body 400 and a plurality of battery cells 500 contained in the box body 400. The box body 400 includes a bottom plate 10 and a protective plate 20. The bottom plate 10 includes a first plate body 11 and a first recess 12 formed by a surface of the first plate body 11 facing the battery cell 500. The bottom wall 121 of the first recess 12 is provided with a first through hole 13. The plurality of first recesses 12 are arranged at intervals in a first direction X, and the first direction X intersects with a thickness direction Z of the first plate body 11. The protective plate 20 is located on a side of the bottom plate 10 away from the battery cell 500. The protective plate 20 and the bottom plate 10 are jointly enclosed to form an exhaust space R1 connected to the first through hole 13. The projection of the pressure relief mechanism of the battery cell 500 on the thickness direction Z of the first plate body 11 overlaps with the projection of the first through hole 13 on the thickness direction Z of the first plate body 11.

[0174] The protective plate 20 includes a second plate body 21 and a first flange structure 22 protruding from the second plate body 21 toward the battery cell 500. The first plate body 11 is located on the side of the first flange structure 22 away from the second plate body 21. The projection of the first recess 12 in the thickness direction Z of the first plate body 11 is located within the projection of the second plate body 21 in the thickness direction Z, and the bottom wall 121 is spaced apart from the second plate body 21 in the thickness direction Z.

[0175] The bottom plate 10 includes a first protrusion 14 protruding from the side of the first plate body 11 away from the battery cell 500. The first protrusion 14 is recessed toward the side of the battery cell 500 to form a first recess 12. The first protrusion 14 and the first plate body 11 are an integral structure, and the first protrusion 14 is bent and connected to the first plate body 11.

[0176] The box body 400 further includes a plurality of side beams disposed on the side of the bottom plate 10 facing the battery cell 500, the plurality of side beams are disposed around the battery cell 500, the plurality of side beams include a first side beam 31 disposed on one side of the battery cell 500 along the first direction X, the first side beam 31 having an exhaust passage R2 connecting the outside of the box body 400 with the exhaust space R1. The exhaust passage R2 includes an exhaust hole R21 formed by a depression on the surface of the first side beam 31 facing away from the battery cell 500, and a first passage R22 formed by a depression on the surface of the second side beam 32 facing the bottom plate 10, the first passage R22 connecting the exhaust hole R21 and the exhaust space R1.

[0177] The bottom plate 10 has a first edge E1 in the first direction X, and the protective plate 20 has a second edge E2 in the first direction X. The first edge E1 and the second edge E2 are both arranged flush with the surface of the first side beam 31 facing away from the battery cell 500. The first plate body 11 is provided with a second through hole 111, and the second through hole 111 connects the first channel R22 and the exhaust space R1.

[0178] The first side beam 31 includes a first portion 311 and a second portion 312 located on a side of the first portion 311 away from the bottom plate 10. The first portion 311 is arranged beyond the second portion 312 in the first direction X and faces the surface of the battery cell 500. The first channel R22 includes a first sub-segment R221 located in the first portion 311 and a second sub-segment R222 located in the second portion 312. The exhaust hole R21 is located in the second portion 312 and communicates with the second sub-segment R222. The size of the first sub-segment R221 in the first direction X is greater than the size of the second sub-segment R222 in the first direction X.

[0179] The plurality of first through holes 13 corresponding to the single first recess 12 are arranged at intervals along the second direction Y, and the first recess 12 has a first side wall 122 in the second direction Y. The first direction X, the second direction Y, and the thickness direction Z intersect each other. The bottom plate 10 includes a second protrusion 15 protruding from the side of the first plate body 11 away from the battery cell 500, and the second protrusion 15 is located on one side of the battery cell 500 along the first direction X. The second protrusion 15 is an integral structure with the first plate body 11, and the second protrusion 15 is bent and connected to the first plate body 11.

[0180] The box body 400 further includes a carrier plate 40 disposed on the side of the bottom plate 10 facing the battery cell 500, the carrier plate 40 includes a third plate body 41 located between the battery cell 500 and the bottom plate 10, the third plate body 41 includes a first body portion 411 and a first weak portion 412, the projection of the first weak portion 412 in the thickness direction Z overlaps with the projection of the pressure relief mechanism in the thickness direction Z. The first body portion 411 includes a fiber material and a resin material, and the material of the first weak portion 412 includes a resin material and does not include a fiber material.

[0181] The supporting plate 40 includes a second flange structure 42 protruding from the side of the third plate body 41 away from the bottom plate 10, the second flange structure 42 is connected to the peripheral edge of the third plate body 41, and the second flange structure covers the surface of the side beam away from the bottom plate 10.

[0182] The battery device 100 further includes a heat shield 50 disposed between the bottom plate 10 and the protection plate 20, and the heat shield 50 includes a second body portion 51 and a second weak portion 52. The projection of the second weak portion 52 in the thickness direction Z overlaps with the projection of the pressure relief mechanism in the thickness direction Z.

[0183] 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 replace some or all of the technical features therein by equivalents; 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 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 the various embodiments 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: The invention comprises a box body and a plurality of battery cells contained in the box body, wherein the box body comprises: A bottom plate, comprising a first plate body and a first concave portion formed by a surface of the first plate body facing the battery cell, wherein a first through hole is provided on a bottom wall of the first concave portion, and a plurality of the first concave portions are arranged at intervals in a first direction, and the first direction intersects with a thickness direction of the first plate body; A protective plate, located at a side of the bottom plate away from the battery cell, the protective plate and the bottom plate together enclose an exhaust space connected to the first through hole; Wherein, a projection of the pressure relief mechanism of the battery cell in the thickness direction overlaps with a projection of the first through hole in the thickness direction.

2. The battery device according to claim 1, characterized in that: The protective plate includes a second plate body and a first flange structure protruding from a side of the second plate body toward the battery cell, and the first plate body is located on a side of the first flange structure away from the second plate body; The projection of the first recess in the thickness direction is located within the projection of the second plate in the thickness direction, and the bottom wall and the second plate are spaced apart in the thickness direction.

3. The battery device according to claim 1, characterized in that: The bottom plate includes a first protrusion protruding from a side of the first plate body away from the battery cell, and the first protrusion is recessed toward a side of the battery cell to form the first recess.

4. The battery device according to claim 3, characterized in that: The first protrusion and the first plate body are an integral structure, and the first protrusion is bent and connected to the first plate body.

5. The battery device according to claim 1, characterized in that: The box body further includes a plurality of side beams disposed on a side of the bottom plate facing the battery cell, the plurality of side beams are disposed around the battery cell, and the plurality of side beams include a first side beam disposed on one side of the battery cell along the first direction; Wherein, the first side beam has an exhaust passage connecting the outside of the box body and the exhaust space.

6. The battery device according to claim 5, characterized in that: The exhaust channel includes an exhaust hole formed by a depression on a side of the first side beam away from the battery cell, and a first channel formed by a depression on a side of the first side beam toward the bottom plate, wherein the first channel communicates with the exhaust hole and the exhaust space.

7. The battery device according to claim 6, characterized in that: The bottom plate has a first edge in the first direction, the protective plate has a second edge in the first direction, and the first edge and the second edge are both arranged flush with a surface of a side of the first side beam away from the battery cell; The first plate body is provided with a second through hole, and the second through hole communicates with the first channel and the exhaust space.

8. The battery device according to claim 6, characterized in that: The first side beam includes a first portion and a second portion located on a side of the first portion away from the bottom plate, and the first portion is arranged beyond the second portion in the first direction toward a surface of the battery cell; The first channel includes a first subsegment located in the first part and a second subsegment located in the second part. The exhaust hole is located in the second part and connected to the second subsegment. The size of the first subsegment in the first direction is larger than the size of the second subsegment in the first direction.

9. The battery device according to claim 1, characterized in that: A plurality of the first through holes corresponding to a single first recess are spaced apart along a second direction, the first recess has a first side wall in the second direction, and the first direction, the second direction and the thickness direction intersect each other.

10. The battery device according to claim 1, characterized in that: The bottom plate includes a second protrusion protruding from a side of the first plate body away from the battery cell, and the second protrusion is located at one side of the battery cell along the first direction.

11. The battery device according to claim 10, characterized in that: The second protrusion and the first plate body are an integral structure, and the second protrusion is bent and connected to the first plate body.

12. The battery device according to claim 1, characterized in that: The box body further comprises a bearing plate disposed on a side of the bottom plate facing the battery monomer, the bearing plate comprising a third plate body located between the battery monomer and the bottom plate; The third plate body includes a first main body portion and a first weak portion, and a projection of the first weak portion in the thickness direction overlaps with a projection of the pressure relief mechanism in the thickness direction.

13. The battery device according to claim 12, characterized in that: The bearing plate further comprises a second flange structure protruding from a side of the third plate body away from the bottom plate, and the second flange structure is connected to a peripheral edge of the third plate body; The box body further includes a plurality of side beams disposed on a side of the bottom plate facing the battery cell, the plurality of side beams surround the battery cell, and the second flange structure covers a surface of the side beam facing away from the bottom plate.

14. The battery device according to claim 1, characterized in that: Also included is a heat insulation plate disposed between the bottom plate and the protective plate, the heat insulation plate including a second main body portion and a second weak portion; Wherein, a projection of the second weak portion in the thickness direction overlaps with a projection of the pressure relief mechanism in the thickness direction.

15. The battery device according to claim 1, characterized in that: The distance between adjacent first recesses in the first direction is L, and L satisfies: 10 mm≤L≤30 mm.

16. An electrical device, characterized in that: The battery device comprises a battery device as claimed in any one of claims 1 to 15, wherein the battery device is used to provide electrical energy.

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