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 contained in the box body, the box body comprises a bottom plate, a pressure relief mechanism is arranged on the side, facing the bottom plate, of each battery monomer, and the bottom plate comprises a first plate body and a plurality of first protruding parts; the first protruding part protrudes out of one side, facing the battery monomer, of the first plate body; the multiple first protruding parts are arranged at intervals in the first direction, first channels are arranged between the adjacent first protruding parts, each first channel comprises a confluence section and multiple air inlet sections, the multiple air inlet sections are arranged at intervals in the second direction, and the confluence sections are located on the same side of the multiple air inlet sections in the first direction and communicate with the multiple air inlet sections; the first direction, the second direction and the thickness direction of the first plate body intersect pairwise. The projection of the pressure relief mechanism in the thickness direction is overlapped with the projection of the air inlet section in the thickness direction.

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, a pressure relief mechanism is provided on the side of the battery cells facing the bottom plate, the bottom plate includes a first plate body and a plurality of first protrusions, the first protrusions protrude from the side of the first plate body facing the battery cells. The plurality of first protrusions are arranged at intervals along a first direction, a first channel is provided between adjacent first protrusions, the first channel includes a confluence section and a plurality of air intake sections, the plurality of air intake sections are arranged at intervals along a second direction, the confluence section is located on the same side of the plurality of air intake sections along the first direction and is connected to the plurality of air intake sections, and the first direction, the second direction and the thickness direction of the first plate body intersect each other. The projection of the pressure relief mechanism in the thickness direction overlaps with the projection of the air intake section in the thickness direction.

[0006] In the above scheme, by providing a plurality of first protrusions at intervals on the bottom plate, a first channel for high-temperature gas to move away from the area where the battery cells are located can be formed, without the need to dig holes in the bottom plate, and the presence of the first protrusions can play a role in structural reinforcement, thereby improving the structural strength of the bottom plate itself and playing a protective role. In addition, the first channel under this design is formed only by the bottom plate itself, rather than being defined by multiple different plate structures, so the guard plate design under the bottom plate can be eliminated, which helps to reduce the complexity of the box and reduce the overall weight of the battery device.

[0007] In addition, the embodiment of the present application adjusts the shape and size of the first protrusion so that the adjacent air intake sections in the second direction will be blocked by part of the structure of the first protrusion. In this way, there is no need to make separate designs for multiple battery cells. Only a single first protrusion is required to achieve the effect of blocking high-temperature gas between multiple different battery cells, thereby reducing the adverse effects of thermal runaway of a battery cell on other adjacent battery cells and improving the reliability of the battery device.

[0008] In some embodiments, the first protrusion includes a main body extending along the second direction and a blocking portion protruding from the main body along the first direction. The multiple blocking portions are spaced apart in the second direction and define an air intake section. Among two adjacent first protrusions, the extension portion of one first protrusion is spaced apart from the blocking portion of the other first protrusion and define a confluence section.

[0009] In the above scheme, the existence of the blocking part can reduce the transfer of high-temperature gas between different battery cells arranged side by side along the second direction, and the cooperation between the blocking part and the main body can reduce the transfer of high-temperature gas between different battery cells arranged side by side along the first direction, thereby further reducing the adverse effects on other battery cells caused by thermal runaway of some battery cells and improving the reliability of the battery device.

[0010] In some embodiments, the box body also includes multiple side beams arranged on the side of the bottom plate facing the battery cell, the multiple side beams include a first side beam arranged on one side of the battery cell along the second direction, the first side beam and the first protrusion are spaced apart in the second direction to form a second channel, and the first channel is connected to the second channel.

[0011] In the above scheme, the second channel is formed by arranging the first side beam and the first protrusion in the second direction at intervals, and the first channel is connected to the second channel, so that the high-temperature gas can move to the second channel through the first channel and leave the area where the multiple battery cells are located with the help of the second channel, thereby reducing the adverse effects of the high-temperature gas on the battery cells and improving the reliability of the battery device.

[0012] In some embodiments, the plurality of side beams include a second side beam disposed along the first direction at one side of the battery cell, and the second side beam has a third channel connecting the outside of the box body with the second channel.

[0013] In the above scheme, a third channel is provided in the second side beam, and the third channel is enabled to connect the second channel with the outside of the box body. Thus, when thermal runaway occurs in the battery cell, the high-temperature gas can be transferred to the outside of the box body through the first channel, the second channel and the third channel in sequence, thereby reducing the adverse effects of the high-temperature gas on the battery device and improving the reliability of the battery device.

[0014] In some embodiments, the third channel includes an exhaust hole formed by an inward depression on a side surface of the second side beam facing away from the battery cell, and a conductive section formed by an inward depression on a side surface of the second side beam facing the bottom plate, the conductive section connecting the exhaust hole and the second channel.

[0015] In the above scheme, the third channel includes an exhaust hole connected to the external environment of the box body, and a conducting section for connecting the exhaust hole and the second channel. The exhaust hole and the conducting section cooperate with each other to achieve the discharge of high-temperature gas, thereby improving the reliability of the battery device.

[0016] In some embodiments, the bottom plate further includes a second protrusion protruding from the side of the first plate body facing the battery cell and a first flange structure, the first flange structure is connected to the edge of the first plate body in the first direction, and the second protrusion is located between the first flange structure and the battery cell along the first direction. The second side beam is located on the side of the first flange structure and the second protrusion away from the first plate body, and the first flange structure and the second protrusion are spaced apart in the first direction, and form a fourth channel connected to the conduction section and the second channel.

[0017] In the above scheme, the first flange structure and the second protrusion in the bottom plate can provide support for the second side beam at the same time, so as to improve the supporting effect of the bottom plate on the second side beam. At the same time, the first flange structure and the second protrusion are also arranged in a first direction and form a fourth channel. The existence of the fourth channel can meet the connection needs between the conduction section and the second channel, so that the high-temperature gas can leave the box and transfer to the external environment through the first channel, the second channel, the fourth channel and the third channel in sequence, meet the exhaust needs of the battery device, and improve the reliability of the battery device.

[0018] In some embodiments, the second 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 conducting section includes a first subsection located in the first portion, 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 greater than the size of the second subsection in the first direction.

[0019] 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.

[0020] In some embodiments, the bottom plate further includes a third protrusion protruding from the first plate body toward the battery cell side, and the third protrusion is located between the second protrusion and the battery cell along the first direction. Two first side beams are arranged on both sides of the battery cell along the second direction, and the spacing between the two first side beams is greater than the size of the second side beam in the second direction, and the plurality of side beams further includes a third side beam connecting the first side beam and the second side beam. The third protrusion is spaced apart from the third side beam in the second direction to form a fifth channel connecting the fourth channel and the second channel.

[0021] In the above scheme, the fifth channel is formed by arranging the third protrusion to be spaced apart from the third side beam in the second direction. With the help of the fifth channel, the fourth channel and the second channel can be connected, that is, the high-temperature gas can be transferred out of the box body through the first channel, the second channel, the fifth channel, the fourth channel and the third channel in sequence, thereby helping to improve the reliability of the battery device.

[0022] In some embodiments, a projection of the battery cell in the thickness direction of the first plate body overlaps with a projection of the first protrusion in the thickness direction of the first plate body.

[0023] In the above scheme, the projection of the battery cell in the thickness direction of the first plate is not completely located within the projection of the first channel in the thickness direction of the first plate, and part of the structure in the battery cell can overlap with the projection of the first protrusion in the thickness direction of the first plate, that is, the first protrusion can support the battery cell, thereby improving the reliability of the battery cell.

[0024] In some embodiments, multiple battery cells arranged side by side in the second direction together constitute a battery row, and multiple battery rows are arranged side by side in the first direction, wherein battery cells in different battery rows are respectively overlapped with projections of different first protrusions in the thickness direction of the first plate.

[0025] In the above scheme, the arrangement of multiple battery cells is matched with the structure of the first protrusion and the arrangement of multiple first protrusions, so that the multiple air intake sections in the first channel can be respectively set corresponding to the pressure relief mechanisms on different battery cells, thereby making the overall arrangement more reasonable and reliable, and helping to improve the exhaust effect.

[0026] 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 second plate body located between the battery cell and the bottom plate, the second plate body includes a first main body portion and a first weak portion, and a projection of the weak portion in the thickness direction of the first plate body overlaps with the projection of the pressure relief mechanism in the thickness direction.

[0027] In the above scheme, the second 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 second plate body for corresponding to the pressure relief mechanism settings 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 corresponding air intake sections. In this way, through the mutual cooperation between the bottom plate and the supporting plate, it 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.

[0028] 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.

[0029] 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 process with higher molding efficiency can be used to prepare and form the carrier plate, and this design can reduce the weight of the carrier plate while meeting the insulation requirements of the carrier plate, which helps to meet the lightweight requirements of the battery device.

[0030] In some embodiments, the supporting plate further includes a second flange structure protruding from the side of the second plate body away from the bottom plate, the second flange structure is connected to the peripheral edge of the second plate body, and covers the surface of the side beam away from the bottom plate.

[0031] 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.

[0032] 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.

[0033] In the above scheme, by adding a heat insulation plate between the bottom plate and the carrier plate, the risk of the carrier 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.

[0034] 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.

[0035] In the above scheme, the plate-like structure can be subjected to a stamping process to prepare a first plate body and a first protrusion that are bent and connected. This design helps to reduce the overall weight of the bottom plate and meet the lightweight requirements of the battery device. At the same time, the existence of the first protrusion can not only meet the exhaust requirements of the battery device, but also enhance the strength of the bottom plate and improve the protection capability of the bottom plate, thereby eliminating the guard plate design under the bottom plate, thereby further reducing the weight of the battery device.

[0036] 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.

[0037] 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

[0038] 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.

[0039] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of the present application;

[0040] Figure 2 is an exploded structural diagram of a box in a battery device provided in some embodiments of the present application;

[0041] Figure 3 is a top view of a box in a battery device provided in some embodiments of the present application;

[0042] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure at the middle area Q;

[0043] Figure 5 is a schematic diagram of a cross-sectional structure of a battery device provided in some embodiments of the present application;

[0044] Figure 6 is a cross-sectional structural diagram of a box in a battery device provided in some embodiments of the present application;

[0045] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure at the middle area P;

[0046] Figure 8It is a schematic diagram of the matching relationship between the side beam and the load-bearing plate in the battery device provided in some embodiments of the present application.

[0047] Tag Name:

[0048] Vehicle 1000; battery device 100; controller 200; motor 300; housing 400; battery cell 500;

[0049] Bottom plate 10; first plate body 11; first protrusion 12; main body 121; blocking portion 122; first flange structure 13; second protrusion 14; third protrusion 15;

[0050] A first side beam 21; a second side beam 22; a first portion 221; a second portion 222; a third side beam 23;

[0051] The supporting plate 30; the second plate body 31; the first main body portion 311; the first weak portion 312; the second flange structure 32;

[0052] Heat insulation board 40; second body portion 41; second weak portion 42;

[0053] first channel T1; air intake section T11; confluence section T12; second channel T2; third channel T3; exhaust hole T31; conduction section T32; first subsection T321; second subsection T322; fourth channel T4; fifth channel T5;

[0054] First direction X, second direction Y; thickness direction Z; DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0060] 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.

[0061] 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.

[0062] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. 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.

[0063] 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).

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] Taking into account that there are usually multiple battery cells in a battery device, in order to reduce the adverse effects of high-temperature gas generated by a single battery cell on adjacent gas battery cells, a plurality of holes are provided on the bottom plate of the box body to correspond to the pressure relief mechanisms of the multiple battery cells. This design scheme is relatively complicated, and the design of multiple holes will also affect the structural reliability of the bottom plate, resulting in the risk of deformation of the bottom plate under the influence of external forces.

[0080] 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.

[0081] 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.

[0082] See also Figure 1 , Figure 1A simple schematic diagram of a vehicle 1000 provided in an embodiment 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.

[0083] 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.

[0084] 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. A pressure relief mechanism is provided on the side of the battery cells 500 facing the bottom plate 10. The bottom plate 10 includes a first plate body 11 and a plurality of first protrusions 12. The first protrusions 12 protrude from the side of the first plate body 11 facing the battery cells 500. The plurality of first protrusions 12 are arranged at intervals along the first direction X. A first channel T1 is provided between adjacent first protrusions 12. The first channel T1 includes a confluence section T12 and a plurality of air intake sections T11. The plurality of air intake sections T11 are arranged at intervals along the second direction Y. The confluence section T12 is located on the same side of the plurality of air intake sections T11 along the first direction X and is connected to the plurality of air intake sections T11. The first direction X, the second direction Y, and the thickness direction Z of the first plate body 11 intersect each other. The projection of the pressure relief mechanism in the thickness direction Z overlaps with the projection of the air intake section T11 in the thickness direction Z.

[0085] The battery cell 500 is the main component in the battery device 100 for providing electric energy. In the battery device 100, there can be multiple battery cells 500, and the multiple battery cells 500 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 500 are both connected in series and in parallel. The multiple battery cells 500 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 500 is accommodated in the box 400; of course, it is also possible that multiple battery cells 500 are first connected in series, in parallel, or in mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and then accommodated in the box 400.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] The base plate 10 includes a first plate body 11 and a first protrusion 12. The first plate body 11 is the main component of the base plate 10. The first protrusion 12 protrudes from the side of the first plate body 11 facing the battery cell 500. There can be multiple connection methods between the first protrusion 12 and the first plate body 11. For example, the first protrusion 12 can be connected to the first plate body 11 by welding and bonding, or the first protrusion 12 and the first plate body 11 can also be an integral structure and prepared by stamping deformation.

[0092] The battery cell 500 is located on one side of the first plate body 11 in the thickness direction Z, and the pressure relief mechanism is located on the side of the battery cell 500 facing the first plate body 11. On this basis, due to the presence of the first protrusion 12, in the thickness direction Z, there can be a certain distance between the surface of the first plate body 11 facing the battery cell 500 and the pressure relief structure. Furthermore, in the embodiment of the present application, a plurality of first protrusions 12 are provided, and the plurality of first protrusions 12 are spaced apart in the first direction X, so that the adjacent first protrusions 12 and the first plate body 11 can be enclosed together to form a first channel T1. The first channel T1 is a spatial structure that can provide a guiding effect for gas flow. When the battery cell 500 has thermal runaway, the high-temperature gas released from the pressure relief mechanism can be transferred with the help of the first channel T1, thereby improving the reliability of the battery device 100.

[0093] Specifically, the first channel T1 includes a confluence section T12 and an air intake section T11. The air intake section T11 is a partial structure in the first channel T1 that is used to correspond to the pressure relief mechanism. The projection of the pressure relief structure in the thickness direction Z overlaps with the projection of the air intake section T11 in the thickness direction Z. The "projection in the thickness direction Z" mentioned here refers to: the positive projection on any plane perpendicular to the thickness direction Z. Since there is an overlapping area between the projections of the pressure relief mechanism and the air intake section T11, when the battery cell 500 has thermal runaway, the high-temperature gas released from the pressure relief mechanism can enter the first channel T1 through the air intake section T11.

[0094] The single first channel T1 defined by two adjacent first protrusions 12 includes multiple air intake segments T11, and different air intake segments T11 are arranged corresponding to the pressure relief mechanisms in different battery cells 500. The multiple air intake segments T11 corresponding to the single first channel T1 are arranged at intervals in the second direction Y, that is, the adjacent air intake segments T11 in the single channel will be blocked by part of the structure in the first protrusion 12, so that the adjacent air intake segments T11 will not be directly connected in the second direction Y. On this basis, the high-temperature gas released from the pressure relief mechanism into the air intake segment T11 will not be directly transferred to other adjacent air intake segments T11, so that the adverse effects on other adjacent battery cells 500 when the battery cell 500 has thermal runaway can be reduced.

[0095] As for different first channels T1, due to the existence of the first protrusion 12, different first channels T1 will not be directly connected in the first direction X. In this way, with the help of the first protrusion 12, the high-temperature gas barrier effect between different battery cells 500 corresponding to different first channels T1 can be achieved, thereby improving the reliability of the battery device 100.

[0096] In some optional embodiments, the first direction X, the second direction Y, and the thickness direction Z of the first plate body 11 are arranged perpendicular to each other.

[0097] The confluence section T12 is a partial structure in the first channel T1 for guiding the gas flow. In a single first channel T1, the confluence section T12 is located on the same side of multiple air intake sections T11 along the first direction X and is connected to the multiple air intake sections T11. The high-temperature gas entering the first channel T1 through the air intake sections T11 can be transferred to the confluence section T12 and leave the area where the battery cell 500 is located under the guidance of the confluence section T12, thereby reducing the adverse effects of the high-temperature gas on the battery cell 500.

[0098] It should be noted that the confluence section T12 can be connected to other channel structures outside the first channel T1, so that with the guidance of the confluence section T12, the high-temperature gas can move to other channel structures and finally transfer away from the box body 400, thereby meeting the exhaust needs of the battery device 100. Optionally, at least one end of the confluence section T12 in the second direction Y is connected to other channel structures.

[0099] In summary, in the embodiment of the present application, by providing a plurality of first protrusions 12 arranged at intervals on the bottom plate 10, a first channel T1 for high-temperature gas to move away from the area where the battery cell 500 is located can be formed, without the need to dig holes in the bottom plate 10, and the presence of the first protrusions 12 can play a role in structural reinforcement, thereby improving the structural strength of the bottom plate 10 itself and playing a protective role. In addition, the first channel T1 under this design is formed only by the bottom plate 10 itself, rather than being defined by a plurality of different plate structures, so the guard plate design under the bottom plate 10 can be eliminated, which helps to reduce the complexity of the box 400 and reduce the overall weight of the battery device 100.

[0100] In addition, the embodiment of the present application adjusts the shape and size of the first protrusion 12 so that the adjacent air intake sections T11 in the second direction Y will be blocked by part of the structure of the first protrusion 12. In this way, there is no need to make separate designs for multiple battery cells 500. Only a single first protrusion 12 is required to achieve the effect of blocking high-temperature gas between multiple different battery cells 500, thereby reducing the adverse effects of thermal runaway of a battery cell 500 on other adjacent battery cells 500 and improving the reliability of the battery device 100.

[0101] It should be noted that Figure 5 The figure only illustrates the positional relationship of some battery cells 500 in the battery device 100 relative to the box body 400, which does not constitute a limit on the number of battery cells 500. Optionally, the number of battery cells 500 is the same as the number of first weak parts 312, and multiple battery cells 500 and multiple first weak parts 312 are arranged corresponding to each other.

[0102] In some embodiments, Figures 1 to 5 As shown, the first protrusion 12 includes a main body 121 extending along the second direction Y and a blocking portion 121 protruding from the main body 121 along the first direction X. The plurality of blocking portions 121 are spaced apart in the second direction Y and define an air intake section T11. Among two adjacent first protrusions 12, the extension portion of one first protrusion 12 is spaced apart from the blocking portion 121 of the other first protrusion 12 and define a confluence section T12.

[0103] The main body 121 is the main part of the first protrusion 12, and the main body 121 may be in a strip-shaped structure and extend along the second direction Y. The blocking portion 121 is a partial structure of the first protrusion 12 located between adjacent air inlet sections T11, and the blocking portion 121 is arranged to protrude from the main body 121 along the first direction X. A plurality of blocking portions 121 are provided, and the plurality of blocking portions 121 are arranged at intervals in the second direction Y, and the size of a single blocking portion 121 in the second direction Y is smaller than the size of the main body 121 in the second direction Y.

[0104] The main body 121 and the blocking portion 121 may be connected in a variety of ways, for example, the two may be connected and fixed by welding or bonding, or the main body 121 and the blocking portion 121 may be an integral structure. Optionally, the main body 121 and the blocking portion 121 are an integral structure, and a side surface of the main body 121 facing away from the first plate body 11 and a side surface of the blocking portion 121 facing away from the first plate body 11 are located in the same plane.

[0105] The air intake section T11 is located between adjacent blocking portions 121 in a single first protrusion 12. The existence of the blocking portions 121 prevents the adjacent air intake sections T11 in the second direction Y from being directly connected in the second direction Y, thereby achieving a barrier effect for high-temperature gas between multiple different battery cells 500 arranged side by side in the second direction Y, thereby improving the reliability of the battery device 100.

[0106] The bus section T12 is located between the blocking portion 121 and the main body 121. Specifically, for two adjacent first protrusions 12, the main body 121 in one of the first protrusions 12 and the blocking portion 121 in the other first protrusion 12 are spaced apart in the first direction X and define to form the bus section T12. On this basis, with the help of the cooperation between the main body 121 and the blocking portion 121, different first channels T1 will not be directly connected in the first direction X, thereby achieving the effect of blocking high-temperature gas between multiple different battery cells 500 arranged side by side in the first direction X, thereby improving the reliability of the battery device 100.

[0107] In summary, in the embodiment of the present application, the existence of the blocking portion 121 can reduce the transfer of high-temperature gas between different battery cells 500 arranged side by side along the second direction Y, and the cooperation between the blocking portion 121 and the main body 121 can reduce the transfer of high-temperature gas between different battery cells 500 arranged side by side along the first direction X, thereby further reducing the adverse effects on other battery cells 500 caused by thermal runaway of some battery cells 500, and improving the reliability of the battery device 100.

[0108] In some embodiments, Figures 2 to 5 As shown, the box body 400 also includes a plurality of side beams arranged on the side of the bottom plate 10 facing the battery cell 500, and the plurality of side beams include a first side beam 21 arranged on one side of the battery cell 500 along the second direction Y, and the first side beam 21 and the first protrusion 12 are spaced apart in the second direction Y to form a second channel T2, and the first channel T1 is connected to the second channel T2.

[0109] 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 21 is a beam structure located on one side of the area where the multiple battery cells 500 are located along the second direction Y, and the first side beam 21 can extend along the first direction X. Optionally, the number of the first side beams 21 is two, and the two first side beams 21 are arranged on both sides of the area where the multiple battery cells 500 are located along the second direction Y and are arranged parallel to each other.

[0110] The first side beam 21 and the first protrusion 12 are spaced apart in the second direction Y, that is, the size of the first protrusion 12 in the second direction Y is smaller than the spacing between the two first side beams 21 in the second direction Y. The second channel T2 is located between the first protrusion 12 and the first side beam 21, and the first channel T1 is connected to the second channel T2. Specifically, one end of the converging section T12 in the second direction Y is connected to the second channel T2.

[0111] It should be noted that, in some optional embodiments, in the thickness direction Z of the first plate body 11, the first side beam 21 and the first protrusion 12 can be at least partially located at the same height position. On this basis, the second channel T2 is formed by the first plate body 11, the first protrusion 12 and the first side beam 21.

[0112] In other optional embodiments, the base plate 10 also includes a third flange structure protruding from the side of the first plate body 11 toward the battery cell 500, the third flange structure is connected to the edge of the first plate body 11 in the second direction Y, and the first side beam 21 is located on the side of the third flange structure away from the first plate body 11. The "flanging structure" mentioned here refers to a structure with a straight wall or flange protruding from the peripheral edge of the first plate body 11 and having a certain angle. The existence of the third flange structure can provide support for the first side beam 21. On this basis, the second channel T2 is formed by the first plate body 11, the first protrusion 12 and the third flange structure. That is, the second channel T2 is formed by the base plate 10 itself, rather than by the first side beam 21 and the base plate 10.

[0113] When a battery cell 500 experiences thermal runaway and generates high-temperature gas, the high-temperature gas first enters the air intake section T11, then transfers to the confluence section T12 through the air intake section T11, and then transfers to the second channel T2 through the confluence section T12, thereby leaving the area where multiple battery cells 500 are located.

[0114] In summary, in the embodiment of the present application, the second channel T2 is formed by arranging the first side beam 21 and the first protrusion 12 in the second direction Y at intervals, and the first channel T1 and the second channel T2 are connected, so that the high-temperature gas can move to the second channel T2 through the first channel T1, and leave the area where the multiple battery cells 500 are located with the help of the second channel T2, thereby reducing the adverse effects of the high-temperature gas on the battery cells 500 and improving the reliability of the battery device 100.

[0115] In addition, the embodiment of the present application only needs to adjust the size of the first protrusion 12 in the second direction Y to define the second channel T2, without adding additional through holes or other component structures, which helps to simplify the structure of the box body 400, reduce the difficulty of preparing the box body 400, and reduce the overall weight of the battery device 100.

[0116] In some embodiments, see Figures 2 to 6 The plurality of side beams include a second side beam 22 disposed along the first direction X at one side of the battery cell 500 , and the second side beam 22 has a third channel T3 connecting the outside of the box body 400 and the second channel T2 .

[0117] In addition to the first side beam 21, the plurality of side beams further include a second side beam 22, which is a beam structure located at one side of the battery cell 500 along the first direction X in the box body 400 and having a third channel T3. The first side beam 21 and the second side beam 22 may be directly connected, or the two may be relatively fixed by means of other beam structures. Figure 2 and Figure 3 As shown, the number of first side beams 21 is two, the length of the second side beam 22 in the second direction Y is less than the spacing between the two first side beams 21 in the second direction Y, and the multiple side beams also include two third side beams 23, the two third side beams 23 are located on both sides of the second side beam 22 along the second direction Y, and are respectively connected to the second side beam 22 and the two first side beams 21.

[0118] The third channel T3 is a channel structure arranged in the second side beam 22, and is used to achieve communication between the outside of the box 400 and the second channel T2, wherein the third channel T3 can be directly connected to the second channel T2, or the two can also be connected through other channel structures.

[0119] In the embodiment of the present application, a third channel T3 is provided in the second side beam 22, and the third channel T3 is enabled to connect the second channel T2 with the outside of the box body 400. Thus, when thermal runaway occurs in the battery cell 500, high-temperature gas can be transferred to the outside of the box body 400 through the first channel T1, the second channel T2 and the third channel T3 in sequence, thereby reducing the adverse effects of high-temperature gas on the battery device 100 and improving the reliability of the battery device 100.

[0120] In some embodiments, the third channel T3 includes an exhaust hole T31 formed by a side surface of the second side beam 22 that is recessed inwardly away from the battery cell 500, and a conductive section T32 formed by a side surface of the second side beam 22 that is recessed inwardly toward the bottom plate 10, and the conductive section T32 connects the exhaust hole T31 with the second channel T2.

[0121] The second side beam 22 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 T31 is formed by the surface of the second side beam 22 facing away from the battery cell 500, that is, the surface of the second side beam 22 facing the external environment, which is recessed inward, so that the exhaust hole T31 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 T31 can be set along the first direction X to penetrate the second side beam 22, or the exhaust hole T31 can also be set not to penetrate the second side beam 22, that is, the exhaust hole T31 can be a through hole structure, or the exhaust hole T31 can also be a blind hole structure.

[0123] The second side beam 22 also has two opposite surfaces in the thickness direction Z of the first plate body 11. Combined with the foregoing content, it can be known that the first channel T1 and the second channel T2 can both be formed by enclosing the bottom plate 10. On this basis, in order to meet the conduction requirements between the second channel T2 and the third channel T3, the embodiment of the present application also forms a conduction section T32 by recessing one side surface of the second side beam 22 toward the bottom plate 10, so that the conduction section T32 can be simultaneously connected to the exhaust hole T31 and the second channel T2, so that the high-temperature gas transferred to the second channel T2 can pass through the conduction section T32 and the exhaust hole T31 in turn, thereby being discharged from the interior of the box body 400.

[0124] In the embodiment of the present application, the third channel T3 includes an exhaust hole T31 connected to the external environment of the box body 400, and a conductive section T32 for connecting the exhaust hole T31 and the second channel T2. The exhaust hole T31 and the conductive section T32 cooperate with each other to achieve the discharge of high-temperature gas, thereby improving the reliability of the battery device 100.

[0125] In some embodiments, Figures 3 to 6 As shown, the bottom plate 10 further includes a second protrusion 14 and a first flange structure 13 protruding from the first plate body 11 toward the battery cell 500, the first flange structure 13 being connected to the edge of the first plate body 11 in the first direction X, and the second protrusion 14 being located between the first flange structure 13 and the battery cell 500 along the first direction X. The second side beam 22 is located on the side of the first flange structure 13 and the second protrusion 14 away from the first plate body 11, and the first flange structure 13 and the second protrusion 14 are spaced apart in the first direction X, and form a fourth channel T4 connected to the conduction section T32 and the second channel T2.

[0126] The first flange structure 13 is a flange structure disposed at the edge of the first plate 11 in the first direction X and protruding from the first plate 11 along the thickness direction Z of the first plate 11. The second protrusion 14 is a structure located between the first flange structure 13 and the battery cell 500 along the first direction X and protruding relative to the first plate 11. The first flange structure 13 and the second protrusion 14 can be connected to the first plate 11 in a variety of ways, for example, the first flange structure 13 and the second protrusion 14 can be connected to the first plate 11 by welding and bonding, or the first flange structure 13 and the second protrusion 14 can be an integral structure with the first plate 11 and formed by a stamping process.

[0127] The second side beam 22 is located on the side of the first flange structure 13 and the second protrusion 14 away from the first plate body 11, that is, in the thickness direction Z of the first plate body 11, the projection of the second side beam 22 is overlapped with the first flange structure 13 and the second protrusion 14 at the same time, and the first flange structure 13 and the second protrusion 14 can simultaneously support the second side beam 22.

[0128] It should be noted that, depending on the different structures of the second side beam 22 in different situations, the surface of the first flange structure 13 on the side facing away from the first plate body 11 may be completely located in the same plane as the surface of the second protrusion 14 on the side facing away from the first plate body 11, or the two may not be located in the same plane. Furthermore, the surface of the first flange structure 13 on the side facing away from the first plate body 11 may be a flat surface parallel to the plane where the first plate body 11 is located, or may be in the form of an inclined surface or a stepped surface, and the surface of the second protrusion 14 on the side facing away from the first plate body 11 is the same.

[0129] In some optional embodiments, the bottom plate 10 further includes a second flange structure 32 protruding from the first plate body 11 on the side facing the battery cell 500, the second flange structure 32 is connected to the edge of the first plate body 11 in the second direction Y, and the first side beam 21 is located on the side of the second flange structure 32 away from the first plate body 11. The surface of the first flange structure 13 away from the first plate body 11 and the surface of the second flange structure 32 away from the first plate body 11 are both flat surfaces and located in the same plane, so that the first flange structure 13 and the second flange structure 32 can provide flat support for multiple side beams.

[0130] In the embodiment of the present application, the first flange structure 13 and the second protrusion 14 in the bottom plate 10 can provide support for the second side beam 22 at the same time, thereby improving the supporting effect of the bottom plate 10 on the second side beam 22. At the same time, the first flange structure 13 and the second protrusion 14 are also arranged at intervals in the first direction X to form a fourth channel T4. The existence of the fourth channel T4 can meet the need for communication between the conductive section T32 and the second channel T2, so that the high-temperature gas can sequentially pass through the first channel T1, the second channel T2, the fourth channel T4 and the third channel T3 to leave the box 400 and transfer to the external environment, meet the exhaust needs of the battery device 100, and improve the reliability of the battery device 100.

[0131] In some embodiments, the second side beam 22 includes a first portion 221 and a second portion 222 located on a side of the first portion 221 away from the bottom plate 10, and the first portion 221 is arranged beyond the second portion 222 in the first direction X and toward the surface of the battery cell 500. The conductive segment T32 includes a first subsegment T321 located in the first portion 221, and a second subsegment T322 located in the second portion 222. The exhaust hole T31 is located in the second portion 222 and communicates with the second subsegment T322. The size of the first subsegment T321 in the first direction X is greater than the size of the second subsegment T322 in the first direction X.

[0132] The second side beam 22 at least includes a first portion 221 and a second portion 222, wherein the first portion 221 is located on a side of the second portion 222 facing the bottom plate 10, and the first portion 221 and the second portion 222 may be an integral structure. The first portion 221 and the second portion 222 may be arranged flush with each other on surfaces facing away from the battery cell 500, and the first portion 221 is arranged beyond the second portion 222 on the surface facing the battery cell 500 in the first direction X, that is, the size of the second portion 222 in the first direction X is smaller than the size of the first portion 221 in the first direction X, so that the second portion 222 may play a certain role in avoiding other components located inside the box body 400, and help to improve the space utilization rate inside the box body 400.

[0133] 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 222 in the first direction X, thereby achieving a certain avoidance effect on the heat exchange structure.

[0134] The conducting section T32 includes a first subsection T321 in the first portion 221 and a second subsection T322 in the second portion 222. The first subsection T321 can be connected to the fourth channel T4 and the second subsection T322 respectively, and the second subsection T322 can be connected to the first subsection T321 and the exhaust hole T31 respectively. In this case, the high-temperature gas can be transferred out of the box body 400 through the fourth channel T4, the first subsection T321, the second subsection T322 and the exhaust hole T31 in sequence.

[0135] It should be noted that, according to different actual needs, one or more exhaust holes T31 may be provided. When there are multiple exhaust holes T31, the size and structure of the second sub-segment T322 may be changed so that a single second sub-segment T322 can be connected to multiple exhaust holes T31 at the same time, or multiple second sub-segments T322 may be provided, and multiple second sub-segments T322 are respectively connected to multiple exhaust holes T31. Optionally, the second side beam 22 includes multiple exhaust holes T31 arranged side by side in the second direction Y, and the second sub-segment T322 has a certain extension size in the second direction Y, and is connected to multiple exhaust holes T31 at the same time.

[0136] Furthermore, in the embodiment of the present application, in view of the fact that the first part 221 and the second part 222 have different sizes in the first direction X, the size of the first sub-segment T321 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 T321 and the second sub-segment T322 in the first direction X can be respectively adapted to the sizes of the first part 221 and the second part 222 in the first direction X, and the larger size of the first sub-segment T321 in the first direction X can reduce the overall weight of the second side beam 22, which helps to achieve a lightweight design of the battery device 100.

[0137] It should be noted that the “size of the first sub-segment T321 in the first direction X” mentioned in the embodiment of the present application refers to the overall size of the first sub-segment T321 in the first direction X, where Figure 5 The size of a portion of the first sub-segment T321 close to the second sub-segment T322 in the first direction X may be the same as the size of the second sub-segment T322 in the first direction X.

[0138] In some embodiments, Figure 2 , Figures 4 to 6As shown, the bottom plate 10 further includes a third protrusion 15 protruding from the first plate body 11 toward the battery cell 500, and the third protrusion 15 is located between the second protrusion 14 and the battery cell 500 along the first direction X. Two first side beams 21 are arranged on both sides of the battery cell 500 along the second direction Y, and the spacing between the two first side beams 21 is greater than the size of the second side beam 22 in the second direction Y. The plurality of side beams further includes a third side beam 23 connecting the first side beam 21 and the second side beam 22. The third protrusion 15 is spaced apart from the third side beam 23 in the second direction Y to form a fifth channel T5 connecting the fourth channel T4 and the second channel T2.

[0139] In addition to the first protrusion 12 and the second protrusion 14, the bottom plate 10 also includes a third protrusion 15, which protrudes from the side of the first plate body 11 facing the battery cell 500 and can also enhance the strength of the bottom plate 10. However, unlike the first protrusion 12 and the second protrusion 14, the third protrusion 15 is not used to support the side beam or the battery cell 500. Optionally, the third protrusion 15 and the first plate body 11 are an integral structure, and the third protrusion 15 is bent and connected to the first plate body 11 through a stamping process, so that the presence of the third protrusion 15 can improve the structural strength of the bottom plate 10 without increasing the weight of the bottom plate 10, and reduce the risk of deformation of the bottom plate 10.

[0140] The third protrusion 15 is located between the second protrusion 14 and the first protrusion 12 along the first direction X, wherein the third protrusion 15 may be disposed adjacent to one of the first protrusion 12 and the second protrusion 14, or may be disposed at intervals. Optionally, the third protrusion 15 is disposed at intervals from both the first protrusion 12 and the second protrusion 14 in the first direction X.

[0141] The third side beam 23 is a beam structure connecting the first side beam 21 and the second side beam 22. Furthermore, in the embodiment of the present application, by setting the third protrusion 15 to be spaced apart from the third side beam 23 in the second direction Y, a fifth channel T5 is formed. With the help of the fifth channel T5, the fourth channel T4 and the second channel T2 can be connected, that is, the high-temperature gas can be transferred out of the box body 400 through the first channel T1, the second channel T2, the fifth channel T5, the fourth channel T4 and the third channel T3 in sequence, thereby helping to improve the reliability of the battery device 100.

[0142] It should be noted that, in some optional embodiments, in the thickness direction Z of the first plate body 11, the third side beam 23 and the third protrusion 15 can be at least partially located at the same height position. On this basis, the fifth channel T5 is formed by the first plate body 11, the third protrusion 15 and the third side beam 23.

[0143] In other optional embodiments, the bottom plate 10 further includes a fourth flange structure protruding from the side of the first plate body 11 facing the battery cell 500, the fourth flange structure is connected to the edge of the first plate body 11, and the third side beam 23 is located on the side of the fourth flange structure away from the first plate body 11. On this basis, the fifth channel T5 is formed by the first plate body 11, the third protrusion 15 and the fourth flange structure.

[0144] In some embodiments, a projection of the battery cell 500 in the thickness direction Z of the first plate body 11 is overlapped with a projection of the first protrusion 12 in the thickness direction Z of the first plate body 11 .

[0145] It should be noted that the battery cell 500 and the first protrusion 12 may have a variety of positional relationships. For example, the battery cell 500 may overlap only with the projection of the main body 121 and the first channel T1 in the thickness direction Z of the first plate 11, or the battery cell 500 may overlap only with the projection of the blocking portion 121 and the first channel T1 in the thickness direction Z of the first plate 11. Alternatively, the battery cell 500 may overlap with the projection of the main body 121, the blocking portion 121, and the first channel T1 in the thickness direction Z of the first plate 11 at the same time. Furthermore, a single battery cell 500 may overlap with the projection of a single first protrusion 12 in the thickness direction Z of the first plate 11, or a single battery cell 500 may overlap with the projection of two adjacent first protrusions 12 in the thickness direction Z of the first plate 11 at the same time.

[0146] In the embodiment of the present application, the projection of the battery cell 500 in the thickness direction Z of the first plate body 11 is not completely located within the projection of the first channel T1 in the thickness direction Z of the first plate body 11, and part of the structure in the battery cell 500 can overlap with the projection of the first protrusion 12 in the thickness direction Z of the first plate body 11, that is, the first protrusion 12 can support the battery cell 500, thereby improving the reliability of the battery cell 500.

[0147] In some embodiments, multiple battery cells 500 arranged side by side in the second direction Y together constitute a battery row, and multiple battery rows are arranged side by side in the first direction X, wherein the battery cells 500 in different battery rows are respectively overlapped with the projections of different first protrusions 12 in the thickness direction Z of the first plate body 11.

[0148] In combination with the above content, it can be known that the multiple protrusions are arranged side by side along the first direction X, and the multiple air intake sections T11 of the pressure relief mechanisms corresponding to different battery cells 500 and the multiple blocking portions 121 on the first protrusion 12 are arranged side by side along the second direction Y. On this basis, the embodiment of the present application also arranges the multiple battery cells 500 side by side along the first direction X and the second direction Y, so as to match the structure of the first protrusion 12 and the arrangement of the multiple first protrusions 12.

[0149] Specifically, multiple battery cells 500 arranged side by side in the second direction Y together constitute a battery row, and a single battery row can be arranged corresponding to a single first protrusion 12. Specifically, multiple battery cells 500 in a single battery row can be arranged corresponding to the same first protrusion 12, that is, the projections of the multiple battery cells 500 in a single battery row in the thickness direction Z of the first plate body 11 overlap with the projections of the same first protrusion 12 in the thickness direction Z of the first plate body 11.

[0150] Multiple battery rows are arranged side by side in the first direction X, and different battery rows are respectively arranged corresponding to different first protrusions 12, that is, the projections of the battery cells 500 located in different battery rows in the thickness direction Z of the first plate body 11 overlap with the projections of different first protrusions 12 in the thickness direction Z of the first plate body 11.

[0151] In the embodiment of the present application, the arrangement of the multiple battery cells 500 is matched with the structure of the first protrusion 12 and the arrangement of the multiple first protrusions 12, so that the multiple air intake sections T11 in the first channel T1 can be respectively set corresponding to the pressure relief mechanisms on different battery cells 500, thereby making the overall arrangement more reasonable and reliable, and helping to improve the exhaust effect.

[0152] In some embodiments, see Figure 2 , Figures 4 to 8 The box body 400 also includes a supporting plate 30 arranged on the side of the bottom plate 10 facing the battery cell 500, the supporting plate 30 includes a second plate body 31 located between the battery cell 500 and the bottom plate 10, the second plate body 31 includes a first main body portion 311 and a first weak portion 312, and the projection of the first weak portion 312 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.

[0153] The supporting plate 30 is a component structure in the box 400 that can directly contact the battery cell 500. The supporting plate 30 can have a variety of material compositions. Optionally, the supporting plate 30 can include non-metallic composite materials. This design can achieve the insulation effect of the supporting plate 30 itself on the one hand, and help achieve the weight reduction effect on the other hand.

[0154] The second plate body 31 is a plate-shaped structure sandwiched between the battery cell 500 and the bottom plate 10 in the carrier plate 30, the first main body 311 is the main component of the second plate body 31, and the first weak portion 312 is a structure corresponding to the pressure relief mechanism on the second plate body 31. Similarly, the first weak portion 312 also corresponds to the position of the air intake section T11 formed by the bottom plate 10. Further, compared with the first main body 311, the first weak portion 312 has a smaller structural strength, so 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 312 and move to the air intake section T11, and then move away from the inside of the box body 400 through the first channel T1, the second channel T2, the third channel T3, the fourth channel T4 and the fifth channel T5 to achieve the exhaust function.

[0155] It should be noted that the first weak portion 312 can have various forms. For example, the first weak portion 312 can be formed by setting a notch or thinning. Optionally, the thickness of the first weak portion 312 is less than the thickness of the first body portion 311, and the thickness of the first weak portion 312 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.

[0156] Further optionally, the first weak portion 312 is formed by an inward depression on the side of the first main body portion 311 facing the battery cell 500, and the surface of the first weak portion 312 facing the side of the base plate 10 is located in the same plane as the surface of the first main body portion 311 facing the side of the base plate 10, which helps to improve the supporting effect of the base plate 10 on the supporting plate 30.

[0157] In the embodiment of the present application, the second plate body 31 in the supporting plate 30 can be in direct contact with the battery cell 500, and at the same time, a plurality of first weak portions 312 are provided on the second plate body 31 for corresponding to the pressure relief mechanism settings 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 312 can be actuated and provide them with independent exhaust channels and connect to the corresponding air intake section T11. In this way, through the mutual cooperation between the bottom plate 10 and the supporting plate 30, 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.

[0158] In some embodiments, the first body portion 311 includes a fiber material and a resin material, and the first weak portion 312 includes a resin material but does not include a fiber material.

[0159] The mixture of fiber material and resin material can be used to manufacture composite materials, wherein the resin material can be used as a matrix material to bond the reinforcing materials together, while the fiber material can be used as a reinforcing material to give the composite material the main mechanical properties.

[0160] The preparation process of the carrier plate 30 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 312 so that the fiber material exists at the first weak portion 312. Then, the resin material is injected into the mold cavity with pressure and solidified, thereby forming the carrier plate 30.

[0161] In this design, since the first weak portion 312 does not contain fiber material compared to the first main body portion 311 , the first weak portion 312 is thinner than the first main body portion 311 and is easily actuated by the impact of high-temperature gas, thereby meeting the exhaust requirements of the battery device 100 .

[0162] In the embodiment of the present application, by configuring the first main body portion 311 to include a fiber material and a resin material, and the first weak portion 312 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 30. This design can reduce the weight of the carrier plate 30 while meeting the insulation requirements of the carrier plate 30, thereby helping to meet the lightweight requirements of the battery device 100.

[0163] In some embodiments, the supporting plate 30 further includes a second flange structure 32 protruding from the side of the second plate body 31 away from the bottom plate 10 . The second flange structure 32 is connected to the peripheral edge of the second plate body 31 and covers the surface of the side beam away from the bottom plate 10 .

[0164] The second flange structure 32 is a partial structure of the load-bearing plate 30 for overlapping the side beam. The second flange structure 32 is arranged on the peripheral side edge of the second plate body 31, 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 30 and the side beam can be fixed by the cooperation and overlap between the second flange structure 32 and the multiple side beams. According to different actual needs, the second flange structure 32 can be connected to the side beam by welding or the like, or the second flange structure 32 and the side beam can also be only contacted and overlapped without being connected to each other.

[0165] It should be noted that the specific shape and size of the second flange structure 32 needs to be determined according to the shape and size of the corresponding side beam. Figure 5As shown, the second side beam 22 includes a first portion 221 and a second portion 222 located on the side of the first portion 221 away from the bottom plate 10, and the first portion 221 is arranged beyond the second portion 222 in the first direction X and toward the surface of the battery cell 500. On this basis, the part of the second flange structure 32 overlapping with the second side beam 22 needs to be provided with a structure of a step surface, so that the second flange structure 32 can contact with the surface of the part of the first portion 221 that exceeds the second portion 222 away from the bottom plate 10, and can also contact with the surface of the second portion 222 away from the bottom plate 10. The design of the step surface helps to further enhance the overlapping effect between the second flange structure 32 and the second side beam 22, and reduce the risk of the relative position relationship between the two changing.

[0166] In the embodiment of the present application, a second flange structure 32 is provided on the bearing plate 30, and the second flange structure 32 is overlapped with the side beam, so that the contact and cooperation between the second flange structure 32 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.

[0167] In some embodiments, Figure 2 , Figures 5 to 7 As shown, the box body 400 also includes a heat insulation plate 40 arranged between the bottom plate 10 and the second plate body 31, the heat insulation plate 40 includes a second main body portion 41 and a second weak portion 42, the thickness of the second main body portion 41 is greater than the thickness of the second weak portion 42, and the projection of the second weak portion 42 in the thickness direction Z overlaps with the projection of the pressure relief mechanism in the thickness direction Z.

[0168] The heat insulation board 40 is a component of the box body 400 that includes a high temperature resistant material. The existence of the heat insulation board 40 can reduce the risk of high temperature and high pressure gas melting through the carrier plate 30. Similar to the carrier plate 30, the heat insulation board 40 also includes a second body portion 41 and a second weak portion 42 of different thicknesses, wherein the second body portion 41 is a main component of the heat insulation board 40, and the second weak portion 42 is a structure on the heat insulation board 40 that corresponds to the pressure relief mechanism. Further, the first weak portion 312, the second weak portion 42 and the air inlet section T11 are correspondingly arranged in the projection on the thickness direction Z of the first plate body 11.

[0169] Compared with the second main body portion 41, the second weak portion 42 has a smaller thickness dimension. Therefore, 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 42 and move it into the air intake section T11, and then move out of the interior of the box body 400 through the first channel T1, the second channel T2, the third channel T3, the fourth channel T4 and the fifth channel T5 to achieve the exhaust function.

[0170] It should be noted that, similar to the first weak portion 312, the second weak portion 42 can also have various forms. For example, the second weak portion 42 can be formed by setting a notch or by thinning. In addition, the first weak portion 312 and the second weak portion 42 can have various structural forms. For example, Figure 2 As shown, the projection of the first weak portion 312 in the thickness direction Z of the first plate body 11 can be a block structure corresponding to the overall shape of the pressure relief mechanism, and the projection of the second weak portion 42 in the thickness direction Z of the first plate body 11 can be a ring structure corresponding to the edge contour of the pressure relief mechanism.

[0171] In the embodiment of the present application, a heat insulating plate 40 is added between the bottom plate 10 and the carrier plate 30, so that the risk of the carrier plate 30 being melted through by high-temperature and high-pressure gas can be reduced by means of the heat insulating plate 40, thereby improving the reliability of the battery device 100. At the same time, a second weak portion 42 is provided on the heat insulating plate 40, and the second weak portion 42 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 100.

[0172] In some embodiments, the first protrusion 12 and the first plate body 11 are an integral structure, and the first protrusion 12 is bent and connected to the first plate body 11 .

[0173] In the embodiment of the present application, the plate-like structure can be subjected to a stamping process to prepare the first plate body 11 and the first protrusion 12 that are bent and connected. This design helps to reduce the overall weight of the bottom plate 10 and meet the lightweight requirements of the battery device 100. At the same time, the presence of the first protrusion 12 can not only meet the exhaust requirements of the battery device 100, but also enhance the strength of the bottom plate 10 and improve the protection capability of the bottom plate 10, thereby eliminating the guard plate design under the bottom plate 10, thereby further reducing the weight of the battery device 100.

[0174] In some optional embodiments, the second protrusion 14 is an integral structure with the first plate body 11, and the second protrusion 14 is bent and connected to the first plate body 11; and / or the third protrusion 15 is an integral structure with the first plate body 11, and the third protrusion 15 is bent and connected to the first plate body 11; and / or the first flange structure 13 is an integral structure with the first plate body 11, and the first flange structure 13 is bent and connected to the first plate body 11.

[0175] 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.

[0176] According to some embodiments of this application, please refer to Figures 1 to 8 The battery device 100 includes a box body 400 and a plurality of battery cells 500 accommodated in the box body 400. The box body 400 includes a bottom plate 10, a load-bearing plate 30, a heat insulation plate 40 and a plurality of side beams. The bottom plate 10 includes a first plate body 11, a plurality of first protrusions 12, a second protrusion 14, a third protrusion 15, a first flange structure 13 and a second flange structure 32. The first protrusion 12, the second protrusion 14, the third protrusion 15, the first flange structure 13 and the second flange structure 32 all protrude from the side of the first plate body 11 facing the battery cell 500. The first protrusion 12 includes a main body 121 extending along the second direction Y and a blocking portion 121 protruding along the first direction X and arranged with the main body 121. A plurality of blocking portions are arranged at intervals in the second direction Y and define an air intake section T11. Among two adjacent first protrusions 12, the main body 121 of one first protrusion 12 and the blocking portion 121 of the other first protrusion 12 are arranged at intervals and define a confluence section T12. The first channel T1 includes the confluence section T12 and the air intake section T11. The projection of the pressure relief structure of the battery cell 500 in the thickness direction Z of the first plate body 11 overlaps with the projection of the air intake section T11 in the thickness direction Z of the first plate body 11.

[0177] The plurality of side beams include a first side beam 21 disposed on one side of the battery cell 500 along the second direction Y, and a second side beam 22 disposed on one side of the battery cell 500 along the first direction X. The first side beam 21 and the first protrusion 12 are spaced apart in the second direction Y to form a second channel T2, and the first channel T1 is connected to the second channel T2. The second side beam 22 has a third channel T3 connecting the outside of the box body 400 and the second channel T2. The third channel T3 includes a conductive section T32 formed by a surface of the second side beam 22 that is concave inwardly on one side away from the battery cell 500, and the conductive section T32 connects the exhaust hole T31 and the second channel T2.

[0178] The first flange structure 13 is connected to the edge position of the first plate body 11 in the first direction X, the second protrusion 14 is located between the first flange structure 13 and the battery cell 500 along the first direction X, the second side beam 22 is located on the side of the first flange structure 13 and the second protrusion 14 away from the first plate body 11, and the first flange structure 13 and the second protrusion 14 are spaced apart in the first direction X, and form a fourth channel T4 connected to the conduction section T32 and the second channel T2.

[0179] The second side beam 22 includes a first portion 221 and a second portion 222 located on a side of the first portion 221 away from the bottom plate 10, the first portion 221 is arranged beyond the second portion 222 in the first direction X and toward the surface of the battery cell 500; the conductive segment T32 includes a first sub-segment T321 located in the first portion 221, a second sub-segment T322 located in the second portion 222, the exhaust hole T31 is located in the second portion 222 and connected to the second sub-segment T322, and the size of the first sub-segment T321 in the first direction X is greater than the size of the second sub-segment T322 in the first direction X.

[0180] The third protrusion 15 is located between the second protrusion 14 and the battery cell 500 along the first direction X, the two first side beams 21 are arranged on both sides of the battery cell 500 along the second direction Y, and the spacing between the two first side beams 21 is greater than the size of the second side beam 22 in the second direction Y. The multiple side beams also include a third side beam 23 connecting the first side beams 21 and the second side beams 22. The third protrusion 15 is spaced apart from the third side beam 23 in the second direction Y to form a fifth channel T5 connecting the fourth channel T4 and the second channel T2.

[0181] The multiple battery cells 500 arranged side by side in the second direction Y together form a battery row. The multiple battery rows are arranged side by side in the first direction X. The battery cells 500 in different battery rows overlap with the projections of different first protrusions 12 in the thickness direction Z.

[0182] The carrier plate 30 includes a second plate body 31 located between the battery cell 500 and the bottom plate 10, the second plate body 31 includes a first main body portion 311 and a first weak portion 312, the thickness of the first main body portion 311 is greater than the thickness of the first weak portion 312, and the projection of the first weak portion 312 in the thickness direction Z overlaps with the projection of the pressure relief mechanism in the thickness direction Z. The carrier plate 30 also includes a second flange structure 32 protruding from the side of the second plate body 31 away from the bottom plate 10, the second flange structure 32 is connected to the peripheral edge of the second plate body 31, and covers the surface of the side beam away from the bottom plate 10.

[0183] The heat insulation board 40 is arranged between the bottom plate 10 and the second plate body 31. The heat insulation board 40 includes a second main body portion 41 and a second weak portion 42. The thickness of the second main body portion 41 is greater than the thickness of the second weak portion 42. The projection of the second weak portion 42 in the thickness direction Z overlaps with the projection of the pressure relief mechanism in the thickness direction Z.

[0184] 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: It comprises a box body and a plurality of battery cells contained in the box body; The box body comprises a bottom plate, and a pressure relief mechanism is provided on a side of the battery cell facing the bottom plate; The bottom plate includes a first plate body and a plurality of first protrusions, wherein the first protrusions protrude from a side of the first plate body facing the battery cells; The plurality of first protrusions are arranged at intervals along a first direction, a first channel is provided between adjacent first protrusions, the first channel comprises a confluence section and a plurality of air inlet sections, the plurality of air inlet sections are arranged at intervals along a second direction, the confluence section is located on the same side of the plurality of air inlet sections along the first direction and is connected to the plurality of air inlet sections, and the first direction, the second direction and the thickness direction of the first plate body intersect each other; Wherein, a projection of the pressure relief mechanism in the thickness direction overlaps with a projection of the air intake section in the thickness direction.

2. The battery device according to claim 1, characterized in that: The first protrusion includes a main body extending along the second direction and a blocking portion protruding from the main body along the first direction; The plurality of blocking portions are spaced apart in the second direction and define the air inlet section, and among two adjacent first protrusions, the main body of one of the first protrusions and the blocking portion of the other first protrusion are spaced apart and define the confluence section.

3. The battery device according to claim 2, 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 including a first side beam disposed on a side of the battery cell along the second direction; The first side beam and the first protrusion are spaced apart from each other in the second direction to form a second channel, and the first channel is connected to the second channel.

4. The battery device according to claim 3, characterized in that: The plurality of side beams include a second side beam disposed on one side of the battery cell along the first direction, and the second side beam has a third channel connecting the outside of the box body and the second channel.

5. The battery device according to claim 4, characterized in that: The third channel includes an exhaust hole formed by an inward depression of a side surface of the second side beam facing away from the battery cell, and a conduction section formed by an inward depression of a side surface of the second side beam facing the bottom plate, wherein the conduction section connects the exhaust hole and the second channel.

6. The battery device according to claim 5, characterized in that: The bottom plate further includes a second protrusion protruding from the first plate body toward the battery cell and a first flange structure, the first flange structure is connected to the edge of the first plate body in the first direction, and the second protrusion is located between the first flange structure and the battery cell along the first direction; The second side beam is located on a side of the first flange structure and the second protrusion away from the first plate body, and the first flange structure and the second protrusion are spaced apart in the first direction to form a fourth channel connected to the conducting section and the second channel.

7. The battery device according to claim 6, characterized in that: The second 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 conducting segment 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.

8. The battery device according to claim 6, characterized in that: The bottom plate further includes a third protrusion protruding from the first plate toward the battery cell, wherein the third protrusion is located between the second protrusion and the battery cell along the first direction; Two first side beams are arranged on both sides of the battery cell along the second direction, and a distance between the two first side beams is greater than a dimension of the second side beam in the second direction, and the plurality of side beams further include a third side beam connecting the first side beam and the second side beam; The third protrusion is spaced apart from the third side beam in the second direction to form a fifth channel connecting the fourth channel and the second channel.

9. The battery device according to claim 1, characterized in that: A projection of the battery cell in the thickness direction is overlapped with a projection of the first protrusion in the thickness direction.

10. The battery device according to claim 9, characterized in that: A plurality of battery cells arranged side by side in the second direction together form a battery row, and a plurality of battery rows are arranged side by side in the first direction; The battery cells in different battery rows are respectively arranged to overlap with projections of different first protrusions in the thickness direction.

11. 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 cell, the bearing plate comprising a second plate body located between the battery cell and the bottom plate; The second 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.

12. The battery device according to claim 11, characterized in that: The first main body portion includes a fiber material and a resin material, and the material of the first weak portion includes the resin material but does not include the fiber material.

13. The battery device according to claim 11, characterized in that: The load-bearing plate further comprises a second flange structure protruding from a side of the second plate body away from the bottom plate, and the box body further comprises a plurality of side beams arranged on a side of the bottom plate facing the battery cell; The second flange structure is connected to the peripheral edge of the second plate body and covers the surface of the side beam facing away from the bottom plate.

14. The battery device according to claim 11, characterized in that: 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.

15. The battery device according to claim 1, 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.

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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