Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a box body having a containing cavity, a first buffer support assembly and a second buffer support assembly which are arranged in a stacking manner along a first direction, the first buffer support assembly has a buffer pressure relief cavity and a first through hole, and the first through hole is in communication with the buffer pressure relief cavity; at least two battery cell assemblies comprising a plurality of battery cells arranged along a third direction; each battery cell comprises a shell and a pressure relief mechanism, the shell comprises a first wall, the pressure relief mechanism is arranged on the first wall, the first wall abuts against the first buffer support assembly, and at least part of the pressure relief mechanism is arranged opposite to the first through hole; the buffer pressure relief cavity extends along the third direction, at least two buffer pressure relief cavities are arranged corresponding to the at least two battery cell assemblies respectively, and the plurality of pressure relief mechanisms of the same battery cell assembly are arranged opposite to the same buffer pressure relief cavity. The battery device provided by the application is beneficial to improving the reliability of the battery device.

Description

Technical Field

[0001] This application relates to battery technology, and more particularly to a battery device and an electrical device. Background Technology

[0002] Battery devices are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with battery devices are now widely used.

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, their reliability is also a crucial consideration. Therefore, how to improve the reliability of battery devices is a problem that those skilled in the art are continuously working to solve. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] In a first aspect, the battery device provided in this application includes a housing and at least two battery cell assemblies arranged along a second direction. The housing has a receiving cavity and includes a first buffer support assembly and a second buffer support assembly stacked along a first direction. The first buffer support assembly is disposed on the side of the second buffer support assembly facing the receiving cavity. The first buffer support assembly has a first through hole and at least two mutually isolated buffer pressure relief cavities. The first through hole communicates with any one of the buffer pressure relief cavities. The battery cell assembly is housed within the receiving cavity and includes multiple battery cells arranged along a third direction. The first direction, the second direction, and the third direction intersect each other but are not coplanar. Each battery cell includes a shell and a pressure relief mechanism. The shell includes a first wall, and the pressure relief mechanism is disposed on the first wall. The first wall abuts against the first buffer support assembly. Along the first direction, at least a portion of the pressure relief mechanism is disposed opposite to the first through hole. The buffer pressure relief cavities extend along a third direction, and at least two battery cell assemblies are respectively disposed corresponding to at least two buffer pressure relief cavities. Multiple pressure relief mechanisms of the same battery cell assembly are disposed opposite to the same buffer pressure relief cavity.

[0006] The battery device provided in this application embodiment includes a housing comprising a first buffer support assembly and a second buffer support assembly stacked along a first direction. The first buffer support assembly has a buffer pressure relief chamber and a first through hole, with the first through hole communicating with the buffer pressure relief chamber. At least a portion of the pressure relief mechanism of the battery cell is disposed opposite to the first through hole. In the event of thermal runaway of a battery cell, the buffer pressure relief chamber can serve as a discharge channel for the internal emissions of the battery cell. Since at least two buffer pressure relief chambers are isolated from each other, in the event of thermal runaway of any battery cell, its emissions are only discharged into one buffer pressure relief chamber, reducing the adverse effects on the battery cells corresponding to other buffer pressure relief chambers and thus reducing the risk of further spread of thermal runaway within the battery device. When the battery device is subjected to external impacts or vibrations, the buffer pressure relief chamber can provide clearance space for the deformation of the first buffer support assembly to buffer and absorb external vibrations or impacts. In addition, the second buffer support assembly can provide a second level of protection, further enhancing the vibration and impact resistance of the housing and reducing the impact of external loads on the first buffer support assembly and the internal components of the housing. Thus, both the second and first buffer support components of the housing can buffer and absorb external impacts or vibrations, reducing damage to the battery cells. Therefore, the battery device provided in this application is beneficial for improving the reliability of the battery device.

[0007] In some embodiments, the first buffer support assembly has a first buffer cavity, which is isolated from the buffer pressure relief cavity and is located on one side of at least one battery cell along a first direction.

[0008] In the above embodiments, when the battery device is subjected to external impact or vibration loads, the first buffer chamber and the buffer pressure relief chamber together provide clearance space for the deformation of the first buffer support assembly, so as to improve the deformation capacity of the first buffer support assembly, thereby improving the buffering and energy absorption effect of the first buffer support assembly and reducing the damage of external loads to the battery cells.

[0009] In some embodiments, the first buffer support assembly includes a first protective plate and at least two support ribs. The first protective plate has a first through hole. The two ends of the support ribs along a first direction are respectively connected to the first protective plate and the second buffer support assembly. The support ribs extend along a third direction. The first protective plate, the second buffer support assembly, and the at least two support ribs surround a buffer pressure relief cavity.

[0010] In the above embodiments, when the battery device is subjected to external impacts or vibrations, the support ribs can deform by bending or other means, which helps to increase the deformation of the first buffer support assembly and thus improve its buffering and energy absorption effect. Furthermore, by including the support ribs and the first protective plate in the first buffer support assembly, the weight of the first buffer support assembly is reduced, thereby increasing the energy density of the battery device.

[0011] In some embodiments, the first buffer support assembly includes at least three support ribs, each of which includes a first support rib, a second support rib, and at least one third support rib spaced apart along a second direction. The first support rib, the second support rib, the first protective plate, and the second buffer support assembly enclose a buffer pressure relief cavity. A third support rib is provided on the side of the first support rib and / or the second support rib facing away from the buffer pressure relief cavity. The second support rib, the third support rib, the first protective plate, and the second buffer support assembly enclose a first buffer cavity, and / or the first support rib, the third support rib, the first protective plate, and the second buffer support assembly enclose a first buffer cavity, wherein the first buffer cavity and the buffer pressure relief cavity are isolated from each other.

[0012] In the above embodiments, the first buffer cavity and the buffer pressure relief cavity are formed by different support ribs, which not only improve the deformation capacity and buffering and energy absorption effect of the first buffer support assembly, but also help to simplify the structure of the first buffer support assembly.

[0013] In some embodiments, at least one support rib includes a first part and a second part that are connected to each other, the first part and the second part are bent into each other, and the end of the first part away from the second part is connected to a first protective plate, and the end of the second part away from the first part is connected to a second buffer support assembly.

[0014] In the above embodiments, when the battery device is subjected to external impact or vibration loads, since the first part and the second part bend towards each other, at least one of the first part and the second part can generate a larger deformation along the first direction, which is beneficial to further increase the deformation of the first buffer support assembly along the first direction, so as to buffer and absorb more impact or vibration loads.

[0015] In some embodiments, the first part and the second part are respectively inclined relative to the first direction, and the inclination directions of the first part and the second part relative to the first direction are opposite.

[0016] In the above embodiments, under the action of external loads such as impact or vibration, both the first part and the second part can generate more deformation along the first direction, which further helps to improve the deformation capability of the first buffer support assembly along the first direction, improve the buffering and energy absorption effect of the first buffer support assembly, and at least part of the component of the external force acting on the first part and the second part along the perpendicular direction can cancel each other out, which helps to improve the structural stability of the first buffer support assembly.

[0017] In some embodiments, the second buffer support assembly includes a first plate, a second plate, and a second buffer cavity. The first plate and the second plate are connected to each other and are at least partially spaced along a first direction. The second buffer cavity is located between the first plate and the second plate.

[0018] In the above embodiments, by providing a second buffer support assembly including a first plate, a second plate, and a second buffer cavity located between the first plate and the second plate, it is possible to further reduce the magnitude of the impact or vibration load transmitted to the battery cells when the battery device is subjected to external impact or vibration loads, thereby further reducing the risk of damage to the battery cells.

[0019] In some embodiments, the first plate includes a first plate body and a plurality of first ribs, the first ribs being connected to the side of the first plate body facing the second buffer cavity.

[0020] In the above embodiments, by setting the first plate to include a first plate body and a first rib, it is beneficial to increase the deformation of the second buffer support assembly, further improve the buffering and energy absorption effect of the second buffer support assembly, and improve the support stability of the second buffer support assembly for the first buffer support assembly and the battery cell.

[0021] In some embodiments, the second plate includes a second plate body and a plurality of second ribs, the second ribs being connected to the side of the second plate body facing the second buffer cavity.

[0022] In the above embodiments, by setting the second plate to include a second plate body and a second rib, it is beneficial to increase the deformation of the second buffer support assembly, further improve the buffering and energy absorption effect of the second buffer support assembly, and improve the support stability of the second buffer support assembly for the first buffer support assembly and the battery cell.

[0023] In some embodiments, the first rib and the second rib are spaced apart, and the first rib and the second rib are respectively inclined relative to the first direction, and are in a direction from the first plate to the second plate and parallel to the first direction. The inclination directions of the first rib and the second rib relative to the first direction are opposite.

[0024] In the above embodiments, at least part of the horizontal component force borne by the first rib and the second rib can cancel each other out, which helps to reduce the risk of relative movement of the first plate and the second plate in the horizontal direction, reduce the risk of swaying of the second buffer support assembly in the horizontal direction, and further help to improve the support stability of the second buffer support assembly under the action of external load.

[0025] In some embodiments, a plurality of first ribs are spaced apart along a second direction, and a plurality of second ribs are spaced apart along a second direction. The first direction and the second direction intersect, and along the second direction, the orthographic projections of the first ribs and the orthographic projections of the second ribs partially overlap.

[0026] In the above embodiments, by setting the orthographic projection of the first rib and the orthographic projection of the second rib to overlap along the second direction, it is beneficial to improve the support stability of the second buffer support assembly for the first buffer support assembly and the battery cell.

[0027] In some implementations, the first and / or second ribs extend in a third direction.

[0028] Thus, when the second buffer support assembly deforms under external load, the first and second plates displace towards each other along the first direction. The first rib abuts against the second plate, and the second rib abuts against the first plate. By setting the first rib to extend along a third direction, the support stability of the first rib on the second plate is improved, and by setting the second rib to extend along a third direction, the support stability of the second rib on the first plate is improved. This further improves the support stability of the second buffer support assembly under external impact or vibration loads.

[0029] In some embodiments, the first buffer support assembly, the first plate, and the second plate are integrally formed.

[0030] In the above embodiments, it is beneficial to simplify the production process of the battery device, improve the production efficiency of the battery device, and improve the connection stability of the first buffer support component, the first plate and the second plate.

[0031] In some embodiments, the first direction is parallel to the direction of gravity, and the first wall of the battery cell is supported by a first buffer support assembly.

[0032] In this way, the first and second buffer support assemblies are located below the battery cell along the direction of gravity. In the event of thermal runaway of the battery cell, its emissions can be discharged into the bottom buffer relief chamber, which helps to reduce the impact of emissions from thermal runaway on the battery cell or other components within the housing. In embodiments where the battery device is used in vehicles, the emissions are discharged in a direction away from the passenger compartment, which can reduce the impact of emissions on the occupants of the vehicle. Furthermore, the buffer relief chamber can be integrated with the space at the bottom of the housing, improving the space utilization and energy density of the battery device.

[0033] In some embodiments, the battery cell further includes electrode terminals, and the housing further includes a second wall, which is disposed opposite to the first wall along the direction of gravity. The electrode terminals are disposed on the second wall, and the first wall is bonded to the first buffer support assembly.

[0034] In the above embodiments, by positioning the electrode terminals on the second wall, the electrode terminals are isolated from the emissions from the battery cells, reducing the risk of internal short circuits caused by contact between the battery cell emissions and the electrode terminals. Furthermore, by bonding the first wall to the first buffer support assembly, the connection reliability between the battery cells and the first buffer support assembly is improved, thereby enhancing the support stability of the housing for the battery cells and ultimately improving the overall structural stability of the battery device.

[0035] In some embodiments, the first buffer support assembly includes at least one first hole group, the first hole group including a plurality of first through holes spaced apart along a third direction, the plurality of first through holes in the same first hole group communicating with the same buffer pressure relief chamber, and the plurality of pressure relief mechanisms of the plurality of battery cells in the same battery cell assembly corresponding one-to-one with the plurality of first through holes in the same first hole group. In the above embodiments, in the event of thermal runaway of any one or more battery cells in the same battery cell assembly, the emissions can flow along a specific path through the corresponding buffer pressure relief chamber, reducing the risk of further spread of thermal runaway within the battery device due to the random flow of emissions inside the housing. Furthermore, the one-to-one correspondence between the first through-hole and the pressure relief mechanism improves the isolation effect between the pressure relief mechanism and the buffer pressure relief chamber, reducing the risk of thermal runaway spreading between multiple battery cells in the same battery cell assembly.

[0036] In some embodiments, the first buffer support assembly includes at least two first hole groups arranged along the second direction, and the battery cell assembly, the first hole groups and the buffer pressure relief chamber are arranged in a one-to-one correspondence.

[0037] In the above embodiments, the high-temperature and high-pressure emissions emitted by different battery cells in different battery cell assemblies under thermal runaway conditions flow to different buffer and pressure relief chambers, thereby reducing the risk that the emissions emitted by any one battery cell under thermal runaway will have an adverse effect on the battery cells in other battery cell assemblies. This is beneficial to further reduce the risk of thermal runaway propagation inside the battery device and improve the reliability of the battery device.

[0038] In some embodiments, the housing further includes a frame assembly connected to both ends of the first buffer support assembly in a third direction, the frame assembly having a pressure relief channel, and at least one end of the buffer pressure relief chamber communicating with the pressure relief channel in a third direction.

[0039] In the above embodiments, if any single battery cell within the battery device experiences thermal runaway, the waste can be discharged through a corresponding buffer pressure relief chamber along a specific discharge path into a pressure relief channel, ultimately being stored within the channel or discharged to the outside of the battery device via the same channel. This helps reduce the risk of the emissions adversely affecting other normally functioning battery cells and reduces the risk of further spread of thermal runaway within the battery device. Furthermore, because the emissions are discharged along a specific path, the thermal protection requirements for the battery cells are lower, which helps reduce the amount of insulation materials, such as mica or ceramic tape, used, thereby reducing the production cost and overall weight of the battery device.

[0040] Secondly, embodiments of this application provide an electrical device, including the battery device provided in any of the above embodiments, the battery device being used to provide electrical energy.

[0041] The electrical device provided in this application has the same technical effect as the battery device provided in any embodiment of this application, and will not be described again here. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application; Figure 2 This is an exploded structural diagram of the battery device provided in the embodiments of this application, with some parts omitted. Figure 3 This is a schematic diagram of the structure of a battery cell assembly in a battery device provided in an embodiment of this application; Figure 4 This is a schematic diagram of the exploded structure of a single battery cell in a battery device provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the battery device provided in the embodiments of this application; Figure 6 A front view of the battery device provided in an embodiment of this application; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure along AA; Figure 8 for Figure 7 A magnified view of a section at point C; Figure 9 for Figure 6 Schematic diagram of the cross-sectional structure along BB; Figure 10 This is a schematic diagram of the structure of the first buffer support assembly and the second buffer support assembly in the battery device provided in the embodiments of this application.

[0043] The accompanying drawings are not necessarily drawn to scale.

[0044] Explanation of reference numerals in the attached figures: 1. Vehicle; 1a. Motor; 1b. Controller; 10. Battery assembly; 11. Housing; 11a. Receiving cavity; 11b. Pressure relief channel; 111. First sub-housing; 112. Second sub-housing; 113. Frame assembly; 20. Battery cell modules; 30. Battery cell; 31. Casing; 311. Housing; 312. End cap; 313. First wall; 314. Second wall; 32. Electrode assembly; 321. Electrode body; 322. Tab; 33. Pressure relief mechanism; 34. Electrode terminal; 40. First buffer support assembly; 40a. Buffer pressure relief chamber; 40b. First through hole; 40c. First buffer chamber; 41. First protective plate; 42. Support rib; 421. First part; 422. Second part; 50. Second buffer support assembly; 50a. Second buffer cavity; 51. First plate; 511. First plate body; 512. First rib; 52. Second plate; 521. Second plate body; 522. Second rib; X, first direction; Y, second direction; Z, third direction; G, direction of gravity. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0047] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0048] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0050] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0052] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0053] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. Specifically, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0054] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0055] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0056] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0057] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0058] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0059] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0060] In some implementations, the electrode assembly is a stacked structure.

[0061] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0062] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0063] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0064] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0065] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0066] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0067] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0068] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0069] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0070] In some embodiments, a pressure relief mechanism is provided on the casing of the battery cell. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0071] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of a battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0072] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0073] As an example, the pressure relief mechanism can also be separately installed and connected to the outer casing.

[0074] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0075] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0076] The emissions from battery cells mentioned in this 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 generated by the reaction, flames, etc.

[0077] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0078] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0079] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, the battery module can be formed by bundling multiple battery cells together with cable ties.

[0080] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0081] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0082] As an example, the battery cell assembly can also be housed in the housing by directly fixing multiple battery cells to the housing.

[0083] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first enclosure may be a top cover or a bottom plate.

[0084] As an example, the enclosure 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 the interior of the enclosure forms a closed space to accommodate the individual battery cells.

[0085] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0086] In some battery devices, the pressure relief mechanism for each battery cell is located at the bottom of the casing along the direction of gravity, and the bottom of the casing is supported by a housing. Thus, the interior of the housing at the bottom of the battery cell typically has a pressure relief channel for the flow of effluent. In other words, the portion of the housing supporting the battery cell is a hollow structure, so that in the event of thermal runaway of the battery cell, the hollow structure can serve as a effluent channel. However, the presence of the hollow structure also limits the support strength of the housing for the battery cell. During operation, battery devices inevitably experience external impacts or vibrations, especially at the bottom, which is more susceptible to these loads. Once these impacts or vibrations are transmitted to the battery cells, given the limited support strength of the housing, irreversible damage can occur to the battery cells, severely affecting the reliability of the battery device.

[0087] In view of this, the battery device provided in this application embodiment includes a housing and at least two battery cell assemblies arranged along a second direction. The housing has a receiving cavity and includes a first buffer support assembly and a second buffer support assembly stacked along a first direction. The first buffer support assembly is disposed on the side of the second buffer support assembly facing the receiving cavity. The first buffer support assembly has a first through hole and at least two buffer pressure relief cavities. The first through hole communicates with any one of the buffer pressure relief cavities. The battery cell assembly is housed in the receiving cavity and includes multiple battery cells arranged along a third direction. The first direction, the second direction, and the third direction intersect each other but are not coplanar. The battery cell includes a shell and a pressure relief mechanism. The shell includes a first wall, and the pressure relief mechanism is disposed on the first wall. The first wall abuts against the first buffer support assembly. Along the first direction, at least a portion of the pressure relief mechanism is disposed opposite to the first through hole. The buffer pressure relief cavities extend along the third direction, and at least two battery cell assemblies are respectively disposed corresponding to at least two buffer pressure relief cavities. Multiple pressure relief mechanisms of the same battery cell assembly are disposed opposite to the same buffer pressure relief cavity.

[0088] The battery device provided in this application includes a housing comprising a first buffer support assembly and a second buffer support assembly stacked along the direction of gravity. The first buffer support assembly has a buffer pressure relief chamber and a first through hole, with the first through hole communicating with the buffer pressure relief chamber. At least a portion of the pressure relief mechanism of the battery cell is disposed opposite to the first through hole. In the event of thermal runaway of a battery cell, the buffer pressure relief chamber can serve as a discharge channel for the internal emissions of the battery cell. Since at least two buffer pressure relief chambers are isolated from each other, in the event of thermal runaway of any battery cell, its emissions are only discharged into one buffer pressure relief chamber, reducing the adverse effects on the battery cells corresponding to other buffer pressure relief chambers and thus reducing the risk of further spread of thermal runaway within the battery device. When the battery device is subjected to external impacts or vibrations, the buffer pressure relief chamber can provide clearance space for the deformation of the first buffer support assembly to buffer and absorb external vibrations or impacts. Furthermore, the second buffer support assembly can provide a second level of protection, further enhancing the vibration and impact resistance of the housing and reducing the impact of external loads on the first buffer support assembly and the internal components of the housing. Thus, both the second and first buffer support components of the housing can buffer and absorb external impacts or vibrations, reducing damage to the battery cells. Therefore, the battery device provided in this application is beneficial for improving the reliability of the battery device.

[0089] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0090] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0091] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0092] For ease of explanation, the following embodiments will be described using a vehicle 1 as an example of an electrical device according to an embodiment of this application.

[0093] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1.

[0094] The vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0095] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0096] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in the embodiments of this application. Figure 3This is a schematic diagram of the structure of the battery cell assembly 20 in the battery device 10 provided in this application embodiment. The battery device 10 includes a housing 11 and battery cells 30, with the battery cells 30 housed within the housing 11. The housing 11 provides a space for accommodating the battery cells 30, and the housing 11 can adopt various structures. In some embodiments, the housing 11 may include a first sub-housing 111 and a second sub-housing 112, which overlap each other, and together define a space for accommodating the battery cells 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-like structure. The first sub-box 111 covers the opening side of the second sub-box 112 so that the first sub-box 111 and the second sub-box 112 together define the accommodating space. Alternatively, the first sub-box 111 and the second sub-box 112 can both be hollow structures with one side open, and the opening side of the first sub-box 111 covers the opening side of the second sub-box 112.

[0097] In the battery device 10, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 30 are connected in both series and parallel configurations. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 30 is housed within the housing 11. Alternatively, the battery device 10 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed manner to form a battery cell assembly 20, and then the multiple battery cell assemblies 20 are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0098] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0099] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a single battery cell 30 in the battery device 10 provided in an embodiment of this application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals 34. The housing 31 includes a casing 311 and an end cap 312. The casing 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment. The electrode terminals 34 may be disposed on the end cap 312 or the casing 311. The electrode assembly 32 may include an electrode body 321 and a tab 322. The tab 322 extends from at least one end of the electrode body 321 and is electrically connected to the electrode terminal 34.

[0100] Firstly, such as Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the battery device 10 provided in this application embodiment includes a housing 11 and at least two battery cell assemblies 20 arranged along a second direction X. The housing 11 has a receiving cavity 11a. The housing 11 includes a first buffer support assembly 40 and a second buffer support assembly 50 stacked along a first direction X. The first buffer support assembly 40 is disposed on the side of the second buffer support assembly 50 facing the receiving cavity 11a. The first buffer support assembly 40 has a first through hole 40b and at least two mutually isolated buffer pressure relief cavities 40a. The first through hole 40b communicates with any one of the buffer pressure relief cavities 40a. The battery cell assemblies 20 are received within the receiving cavity 11a. The battery cell assembly 20 includes a plurality of battery cells 30 arranged along a third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other but are not coplanar. Each battery cell 30 includes a housing 31 and a pressure relief mechanism 33. The housing 31 includes a first wall 313, and the pressure relief mechanism 33 is disposed on the first wall 313. The first wall 313 abuts against a first buffer support assembly 40. Along a first direction X, at least a portion of the pressure relief mechanism 33 is disposed opposite to a first through hole 40b. A buffer pressure relief cavity 40a extends along a third direction Z. At least two battery cell assemblies 20 are respectively disposed corresponding to at least two buffer pressure relief cavities 40a. Multiple pressure relief mechanisms 33 of the same battery cell assembly 20 are disposed opposite to the same buffer pressure relief cavity 40a.

[0101] The first buffer support assembly 40 and the second buffer support assembly 50 are stacked along the first direction X. Optionally, the first direction X may be parallel to the gravity direction G, or the first direction X may be horizontal. In the embodiment where the first direction X is parallel to the gravity direction G, the first buffer support assembly 40 and the second buffer support assembly 50 may be located above the battery cell 30 along the gravity direction G, or the first buffer support assembly 40 and the second buffer support assembly 50 may be located below the battery cell 30 along the gravity direction G.

[0102] Optionally, the first buffer support assembly 40 and the second buffer support assembly 50 can be in the form of a flat plate, a block, or other irregular shapes. Optionally, the first buffer support assembly 40 and the second buffer support assembly 50 can be stacked and isolated from each other; in other words, the first buffer support assembly 40 and the second buffer support assembly 50 can be set independently and are not connected. Specifically, the second buffer support assembly 50 may include a first plate 51, which can be used to separate the buffer pressure relief chamber 40a of the first buffer support assembly 40 and the second buffer chamber 50a of the second buffer support assembly 50. In this way, when the battery device 10 is subjected to an external load, the second buffer support assembly 50 first absorbs part of the impact energy to protect the first buffer support assembly 40 and the internal components of the housing 11, reducing the impact of the external load on the thermal runaway emissions of the battery device 10 and the operation of the battery cells 30. Even if the second buffer support assembly 50 deforms and cracks, the first buffer support assembly 40 can still meet the functions of sealing, pressure relief, and emission of the battery device 10.

[0103] The housing 11 may also include a frame assembly 113, such as a frame beam, etc. The first buffer support assembly 40 and the second buffer support assembly 50 can be connected to and supported by the frame beam, etc. The first buffer support assembly 40 and the second buffer support assembly 50 can provide a certain degree of protection for the battery cell 30, so as to maintain a certain sealing performance of the housing cavity 11a of the housing 11, reduce the risk of external water and other impurities entering the housing 11, and in the event of external impact or collision on the battery device 10, the first buffer support assembly 40 and the second buffer support assembly 50 can withstand a certain impact or collision, so as to reduce the risk of impact or collision loads being transmitted to the battery cell 30.

[0104] The first buffer support assembly 40 and the second buffer support assembly 50 can respectively provide a certain buffering effect along the first direction X for the battery cell 30. That is, the first buffer support assembly 40 and the second buffer support assembly 50 can respectively generate deformation along the first direction X to buffer and absorb some of the external impact or vibration loads, and reduce the damage of external impact or vibration loads to the battery cell 30.

[0105] The first buffer support component 40 can generate elastic or plastic deformation at least along the first direction X. In other words, under the action of external impact or vibration loads, the battery device 10 is subjected to impact or vibration loads along the first direction X, and the first buffer support component 40 can generate a certain amount of compressive deformation at least along the first direction X. After the external impact or vibration loads are removed, the first buffer support component 40 can recover part or all of its deformation, or the first buffer support component 40 can not recover its deformation at all. In this way, the first buffer support component 40 can buffer and absorb external impact or vibration loads by generating deformation, reducing the magnitude of the impact or vibration load transmitted to the battery cell 30, thereby reducing the damage of external impact or vibration loads to the battery cell 30. Especially when the first direction X is parallel to the gravity direction G, and the first buffer support component 40 is located at the bottom of the battery cell 30 along the gravity direction G, the first buffer support component 40 can improve the bottom ball protection capability of the battery device 10.

[0106] Similarly, the second buffer support component 50 can also generate elastic or plastic deformation along the first direction X to buffer and absorb some of the impact or vibration loads.

[0107] Specifically, when the battery device 10 is subjected to external impact or vibration loads, such as the bottom of the battery device 10 being subjected to a certain vibration or impact load, the external impact or vibration load is first transmitted to the second buffer support component 50. The second buffer support component 50 deforms, buffers and absorbs part of the impact or vibration load, and the other part continues to be transmitted to the first buffer support component 40. The first buffer support component 40 then buffers and absorbs part of the load before transmitting it to the battery cell 30. In this way, the external vibration or impact load is buffered and absorbed by the second buffer support component 50 and the first buffer support component 40 in sequence, which greatly reduces the impact or vibration load transmitted to the battery cell 30, thereby reducing the damage of the external load to the battery cell 30.

[0108] Optionally, the first buffer support component 40 and the second buffer support component 50 can be integrally formed, or the first buffer support component 40 and the second buffer support component 50 can be processed and formed separately, and then connected together by welding, bonding or threaded connection.

[0109] Optionally, at least one of the first buffer support assembly 40 and the second buffer support assembly 50 may include an elastic element, such as a rubber element, a silicone element, or a spring. In this case, the first buffer support assembly 40 and / or the second buffer support assembly 50 undergoes elastic deformation under external impact or vibration loads, and the elastic modulus of the first buffer support assembly 40 and / or the second buffer support assembly 50 can be set as needed. Alternatively, one of the first buffer support assembly 40 and the second buffer support assembly 50 may include a rigid element, such as steel, aluminum, or other composite material, which may have a deformation cavity inside. Under external impact or vibration loads, the deformation of the first buffer support assembly 40 and / or the second buffer support assembly 50 provides deformation space.

[0110] The first buffer support assembly 40 has a buffer pressure relief chamber 40a. Under the action of external impact or vibration loads, the buffer pressure relief chamber 40a can provide clearance space for the deformation of the first buffer support assembly 40, so as to buffer and absorb part of the load.

[0111] The housing 31 of the battery cell 30 may include a housing 311 and an end cap 312. One or both ends of the housing 311 have openings, and the end cap 312 covers the openings of the housing 311 to form a sealed receiving space. Optionally, the first wall 313 may be at least a part of the end cap 312, or the first wall 313 may be a part of the housing 311.

[0112] Optionally, the battery cell 30 may also include an electrode terminal 34, which may be disposed on the wall portion of the housing 31 opposite to the first wall 313.

[0113] The pressure relief mechanism 33 can be an element or component that is actuated to release internal pressure or temperature when the internal pressure, temperature, or other conditions of the battery cell 30 reach a predetermined threshold. This threshold design varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 30. The pressure relief mechanism 33 can take the form of an explosion-proof valve, gas valve, pressure relief valve, or safety valve, and can specifically employ pressure-sensitive or temperature-sensitive elements or structures. That is, when the internal pressure, temperature, or other conditions of the battery cell 30 reach the predetermined threshold, the pressure relief mechanism 33 actuates, or a weak structure provided in the pressure relief mechanism 33 is damaged, thereby forming an opening or channel to allow internal emissions to be discharged in the event of thermal runaway of the battery cell 30.

[0114] At least a portion of the pressure relief mechanism 33 is disposed opposite to the first through hole 40b. Optionally, a portion or all of the pressure relief mechanism 33 may be disposed opposite to the first through hole 40b, that is, along the first direction X, a portion or all of the orthographic projection of the pressure relief mechanism 33 falls into the first through hole 40b. In this way, in the event of thermal runaway of the battery cell 30, the pressure relief mechanism 33 is activated, and the high-temperature and high-pressure discharge from inside the battery cell 30 can flow into the buffer pressure relief chamber 40a through the first through hole 40b.

[0115] The first direction X, the second direction Y, and the third direction Z can intersect each other at right angles or acute angles. For example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0116] The battery device 10 may have multiple battery cells 30, each battery cell 30 having a pressure relief mechanism 33, and each pressure relief mechanism 33 may be correspondingly configured with a first through hole 40b. The first buffer support assembly 40 includes at least two mutually isolated buffer pressure relief chambers 40a, and different first through holes 40b may communicate with the same or different buffer pressure relief chambers 40a. Optionally, the first through hole 40b may also be configured as a strip-shaped through hole extending along the arrangement direction of the multiple battery cells 30; in other words, one first through hole 40b may be correspondingly configured with multiple pressure relief mechanisms 33; or, the first through hole 40b may be configured to correspond one-to-one with a pressure relief mechanism 33. Each first through hole 40b communicates with only one buffer pressure relief chamber 40a.

[0117] Optionally, the buffer pressure relief chamber 40a can be configured to correspond one-to-one with the battery cell assembly 20, or at least two battery cell assemblies 20 can be configured to correspond to the same buffer pressure relief chamber 40a.

[0118] In the event of thermal runaway of any single cell 30 in the battery cell assembly 20, the emissions will only be discharged into one of the corresponding two buffer pressure relief chambers 40a, and will not be discharged into the other buffer pressure relief chambers 40a. Since the buffer pressure relief chambers 40a are isolated from each other, it is beneficial to reduce the adverse effects of the emissions from any single cell 30 on the corresponding battery cell assembly 20 in the event of thermal runaway, and reduce the risk of further spread of thermal runaway of the single cell 30.

[0119] Therefore, the buffer pressure relief chamber 40a can provide a certain clearance space for the deformation of the first buffer support assembly 40, so as to buffer and absorb external vibration or impact loads through the deformation of the first buffer support assembly 40. In addition, the buffer pressure relief chamber 40a can also provide a flow channel for the corresponding battery cell 30 in the event of thermal runaway, reducing the risk of further spread of thermal runaway inside the battery device 10.

[0120] The battery device 10 provided in this application embodiment includes a housing 11 comprising a first buffer support assembly 40 and a second buffer support assembly 50 stacked along a first direction X. The first buffer support assembly 40 has a buffer pressure relief chamber 40a and a first through hole 40b, with the first through hole 40b communicating with the buffer pressure relief chamber 40a. At least a portion of the pressure relief mechanism 33 of the battery cell 30 is disposed opposite to the first through hole 40b. In the event of thermal runaway of the battery cell 30, the buffer pressure relief chamber 40a can serve as a discharge channel for the internal emissions of the battery cell 30. Furthermore, since at least two buffer pressure relief chambers 40a are isolated from each other, in the event of thermal runaway of any battery cell 30... The emissions are discharged only into one buffer pressure relief chamber 40a, reducing the adverse effects on the battery cells 30 corresponding to other buffer pressure relief chambers 40a, thereby reducing the risk of further spread of thermal runaway inside the battery device 10. When the battery device 10 is subjected to external impacts or vibrations, the buffer pressure relief chamber 40a can provide clearance for the deformation of the first buffer support assembly 40, thus buffering and absorbing external vibrations or impacts. In addition, the second buffer support assembly 50 can provide a second level of protection, further enhancing the vibration and impact resistance of the housing 11 and reducing the impact of external loads on the first buffer support assembly 40 and the internal components of the housing 11a. Thus, both the second buffer support assembly 50 and the first buffer support assembly 40 of the housing 11 can buffer and absorb external impacts or vibrations, reducing damage to the battery cells 30. Therefore, the battery device 10 provided in this application is beneficial to improving the reliability of the battery device 10.

[0121] In some embodiments, such as Figure 6 , Figure 7 and Figure 8 As shown, the first buffer support assembly 40 has a first buffer cavity 40c, which is isolated from the buffer pressure relief cavity 40a and is located on one side of at least one battery cell 30 along the first direction X.

[0122] The first buffer chamber 40c is isolated from the buffer pressure relief chamber 40a, so the emissions emitted by the battery cell 30 in the event of thermal runaway will not be discharged into the first buffer chamber 40c. Since the first buffer chamber 40c is located on the side of at least one battery cell 30 along the first direction X, when the battery device 10 is subjected to external impact or vibration loads, the first buffer chamber 40c can provide a certain clearance space for the deformation of the first buffer support assembly 40, thereby increasing the deformation of the first buffer support assembly 40, and thus improving the buffering and energy absorption effect of the first buffer support assembly 40, and reducing the damage of external loads to the battery cell 30.

[0123] In this way, when the battery device 10 is subjected to external impact or vibration loads, the first buffer chamber 40c and the buffer pressure relief chamber 40a together provide clearance space for the deformation of the first buffer support assembly 40, thereby improving the deformation capacity of the first buffer support assembly 40, and thus improving the buffering and energy absorption effect of the first buffer support assembly 40, and reducing the damage of external loads to the battery cell 30.

[0124] In some embodiments, such as Figure 7 and Figure 8 As shown, the first buffer support assembly 40 includes a first protective plate 41 and at least two support ribs 42. The first protective plate 41 has a first through hole 40b. The two ends of the support ribs 42 along the first direction X are respectively connected to the first protective plate 41 and the second buffer support assembly 50. The support ribs 42 extend along the third direction Z. The first protective plate 41, the second buffer support assembly 50 and the at least two support ribs 42 surround and form a buffer pressure relief cavity 40a.

[0125] One end of the support rib 42 along the first direction X is connected to the first protective plate 41, and the other end of the support rib 42 along the first direction X is connected to the second buffer support assembly 50. The support rib 42 can provide a certain support for the first protective plate 41, so that the first buffer support assembly 40 has a certain support stability. Optionally, the support rib 42 can be arranged parallel to the first direction X, or the support rib 42 can be arranged at an angle relative to the first direction X. Along the first direction X, the surface of the first protective plate 41 facing the battery cell assembly 20 can be a plane. The first protective plate 41 can be set as a flat plate, so as to increase the contact area between the first protective plate 41 and the battery cell assembly 20, and enhance the support and protection of the battery cell assembly 20 by the first protective plate 41.

[0126] If the support rib 42 extends along the third direction Z, the support rib 42 can extend along the third direction Z in a long strip shape. This is beneficial to improving the support stability of the support rib 42 on the first protective plate 41. In addition, the buffer pressure relief cavity 40a between two adjacent support ribs 42 can also be long strip shape, which is further beneficial to improving the smoothness of the discharge through the buffer pressure relief cavity 40a.

[0127] The support rib 42, the first protective plate 41, and the second buffer support assembly 50 can be formed separately and then connected together by welding or other means. Alternatively, one of the first protective plate 41 and the second buffer support assembly 50 can be integrally formed with the support rib 42 and then connected to the other by welding or other means. Or, the support rib 42, the first protective plate 41, and the second buffer support assembly 50 can be integrally formed.

[0128] When the battery device 10 is subjected to external loads such as impact or vibration, the support rib 42 can deform by bending or other means, which helps to increase the deformation of the first buffer support assembly 40, thereby improving the buffering and energy absorption effect of the first buffer support assembly 40. Furthermore, the fact that the first buffer support assembly 40 includes the support rib 42 and the first protective plate 41 helps to reduce the weight of the first buffer support assembly 40 and increase the energy density of the battery device 10.

[0129] In some embodiments, such as Figure 7 and Figure 8 As shown, the first buffer support assembly 40 includes at least three support ribs 42, each of which includes a first support rib, a second support rib, and at least one third support rib spaced apart along the second direction Y. The first support rib, the second support rib, the first protective plate 41, and the second buffer support assembly 50 form a buffer pressure relief cavity 40a. The third support rib is provided on the side of the first support rib and / or the second support rib facing away from the buffer pressure relief cavity 40a. The second support rib, the third support rib, the first protective plate 41, and the second buffer support assembly 50 form a first buffer cavity 40c, and / or the first support rib, the third support rib, the first protective plate, and the second buffer support assembly form a first buffer cavity 40c. The first buffer cavity 40c is isolated from the buffer pressure relief cavity 40a.

[0130] Optionally, the first buffer cavity 40c can be provided only on the side of the first support rib away from the buffer pressure relief cavity 40a, or the first buffer cavity 40c can be provided only on the side of the second support rib away from the buffer pressure relief cavity 40a. Of course, the first buffer cavity 40c can also be provided on both the side of the first support rib and the side of the second support rib away from the buffer pressure relief cavity 40a, so as to further improve the buffering and energy absorption effect of the first buffer support assembly 40.

[0131] In this way, the first buffer cavity 40c and the buffer pressure relief cavity 40a, which are mutually isolated by different support ribs 42, are conducive to further simplifying the structure of the first buffer support assembly 40. The support ribs 42 can extend along the third direction Z, and the second direction Y intersects with both the first direction X and the third direction Z. The first buffer cavity 40c and the buffer pressure relief cavity 40a formed in this way can also be extended along the third direction Z.

[0132] It should be noted that the designations "first," "second," and "third" in the names of the first, second, and third support ribs merely indicate different arrangements of the support ribs 42, and do not imply any special structure among them. In fact, the structures of the first, second, and third support ribs can be completely identical, completely different, or partially identical.

[0133] Therefore, this configuration, which forms the first buffer cavity 40c and the buffer pressure relief cavity 40a through different support ribs 42, not only improves the deformation capacity and buffering and energy absorption effect of the first buffer support assembly 40, but also helps to simplify the structure of the first buffer support assembly 40.

[0134] In some embodiments, such as Figure 7 and Figure 8 As shown, at least one support rib 42 includes a first part 421 and a second part 422 that are connected to each other. The first part 421 and the second part 422 are bent together. The end of the first part 421 away from the second part 422 is connected to the first protective plate 41, and the end of the second part 422 away from the first part 421 is connected to the second buffer support assembly 50.

[0135] Thus, the first part 421 is connected to the first protective plate 41 and the second part 422 at both ends along the first direction X, and the second part 422 is connected to the first part 421 and the second buffer support assembly 50 at both ends along the first direction X.

[0136] The first part 421 and the second part 422 can be bent into right angles, acute angles, or obtuse angles, etc. The cross-sectional shape of the first part 421 and the second part 422 can be approximately in the shape of ">" or "<". One of the first part 421 and the second part 422 can be parallel to the first direction X, and the other can be inclined relative to the first direction X, or both the first part 421 and the second part 422 can be inclined relative to the first direction X.

[0137] Optionally, the first part 421 and the second part 422 can be processed separately and then connected together, or the first part 421 and the second part 422 can be integrally formed and then bent together by a bending process.

[0138] In this way, when the battery device 10 is subjected to external impact or vibration loads, since the first part 421 and the second part 422 bend each other, at least one of the first part 421 and the second part 422 can generate a larger deformation along the first direction X, which is beneficial to further increase the deformation of the first buffer support assembly 40 along the first direction X, so as to buffer and absorb more impact or vibration loads.

[0139] In some embodiments, such as Figure 7 and Figure 8 As shown, the first part 421 and the second part 422 are respectively inclined relative to the first direction X, and the inclination directions of the first part 421 and the second part 422 relative to the first direction X are opposite.

[0140] Thus, under the action of external loads such as impact or vibration, both the first part 421 and the second part 422 can generate more deformation along the first direction X, which further helps to improve the deformation capability of the first buffer support assembly 40 along the first direction X and improve the buffering and energy absorption effect of the first buffer support assembly 40. In addition, the components of the external forces borne by the first part 421 and the second part 422 along the direction perpendicular to the first direction X are opposite. Thus, at least part of the components of the external forces acting on the first part 421 and the second part 422 along the direction perpendicular to the first direction X can cancel each other out, which helps to improve the structural stability of the first buffer support assembly 40.

[0141] In some embodiments, such as Figure 7 and Figure 8 As shown, the second buffer support assembly 50 includes a first plate 51, a second plate 52, and a second buffer cavity 50a. The first plate 51 and the second plate 52 are connected to each other and are at least partially spaced along the first direction X. The second buffer cavity 50a is located between the first plate 51 and the second plate 52.

[0142] At least portions of the first plate 51 and the second plate 52 are spaced apart along a direction intersecting the first direction X to form a second buffer cavity 50a between the first plate 51 and the second plate 52. When the battery device 10 is subjected to external loads such as impacts or vibrations, at least one of the first plate 51 and the second plate 52 can deform toward the second buffer cavity 50a to buffer and absorb part of the external impact or vibration load, thereby reducing the magnitude of the external load transmitted to the first buffer support assembly 40 and the battery cell 30.

[0143] Therefore, by setting the second buffer support assembly 50 to include a first plate 51, a second plate 52, and a second buffer cavity 50a located between the first plate 51 and the second plate 52, it is possible to further reduce the magnitude of the impact or vibration load transmitted to the battery cell 30 under the action of external impact or vibration loads on the battery device 10, and further reduce the risk of damage to the battery cell 30.

[0144] In some embodiments, such as Figure 7 , Figure 8 and Figure 10 As shown, the first plate 51 includes a first plate body 511 and a plurality of first ribs 512, the first ribs 512 being connected to the side of the first plate body 511 facing the second buffer cavity 50a.

[0145] The first plate 511 can be flat, and the first rib 512 can be integrally formed with the first plate 511, or the first rib 512 and the first plate 511 can be processed and formed separately, and then connected together by welding or bonding. The first rib 512 can be long and narrow, and multiple first ribs 512 can be spaced apart from each other.

[0146] Optionally, the first rib 512 may be parallel to the first direction X, or the first rib 512 may be inclined relative to the first direction X.

[0147] The first rib 512 is connected to the side of the first plate 511 facing the second buffer cavity 50a, and is spaced apart from the first plate 51 along the first direction X. When the battery device 10 is subjected to external impact or vibration loads, the first plate 511 deforms along the first direction X toward the first plate 51 until the first rib 512 abuts against the first plate 51. The first rib 512 is more likely to deform along the first direction X, thereby increasing the deformation of the second buffer support assembly 50 along the first direction X, further improving the buffering and energy absorption capacity of the second buffer support assembly 50. Moreover, when the first rib 512 abuts against the first plate 51, the second buffer support assembly 50 has higher support stiffness, thereby improving the support stability of the second buffer support assembly 50 and reducing the risk of the second buffer support assembly 50 shaking.

[0148] Therefore, by setting the first plate 51 to include the first plate body 511 and the first rib 512, it is beneficial to increase the deformation of the second buffer support assembly 50, further improve the buffer energy absorption effect of the second buffer support assembly 50, and improve the support stability of the second buffer support assembly 50 on the first buffer support assembly 40 and the battery cell 30.

[0149] In some embodiments, such as Figure 7 and Figure 8 As shown, the second plate 52 includes a second plate body 521 and a plurality of second ribs 522, the second ribs 522 being connected to the side of the second plate body 521 facing the second buffer cavity 50a.

[0150] The second plate 521 can be plate-shaped. The second rib 522 can be integrally formed with the second plate 521. Alternatively, the second plate 521 and the second rib 522 can be separately formed and then connected together by welding or bonding. The second rib 522 can be an extended strip, and multiple second ribs 522 can be spaced apart from each other.

[0151] Optionally, the second rib 522 may be parallel to the first direction X, or the second rib 522 may be inclined relative to the first direction X.

[0152] The second rib 522 is connected to the side of the second plate 521 facing the second buffer cavity 50a, and is spaced apart from the first plate 51 along the first direction X. When the battery device 10 is subjected to external impact or vibration loads, the second plate 521 deforms along the first direction X toward the first plate 51 until the second rib 522 abuts against the first plate 51. The second rib 522 is more likely to deform along the first direction X, which helps to increase the deformation of the second buffer support assembly 50 along the first direction X, further improving the buffering and energy absorption capacity of the second buffer support assembly 50. Moreover, when the second rib 522 abuts against the first plate 51, the second buffer support assembly 50 has higher support stiffness, which also helps to improve the support stability of the second buffer support assembly 50.

[0153] Therefore, by setting the second plate 52 to include the second plate body 521 and the second rib body 522, it is beneficial to increase the deformation of the second buffer support assembly 50, further improve the buffer energy absorption effect of the second buffer support assembly 50, and improve the support stability of the second buffer support assembly 50 on the first buffer support assembly 40 and the battery cell 30.

[0154] In some embodiments, such as Figure 7 and Figure 8 As shown, the first rib 512 and the second rib 522 are spaced apart. The first rib 512 and the second rib 522 are respectively inclined relative to the first direction X, and are in a direction from the first plate 511 to the second plate 521 and parallel to the first direction X. The first rib 512 and the second rib 522 are respectively inclined in opposite directions relative to the first direction X.

[0155] The first rib 512 and the second rib 522 are respectively inclined relative to the first direction X, so the first rib 512 and the second rib 522 are more likely to deform along the first direction X.

[0156] Along the first direction X, the first rib 512 and the second rib 522 are respectively inclined in opposite directions relative to the first direction X. Under external impact or vibration loads, the first rib 512 abuts against the second plate 521, and the second rib 522 abuts against the second plate 521. A portion of the force borne by the first rib 512 and the second rib 522 is distributed perpendicular to the first direction X; that is, both the first rib 512 and the second rib 522 bear a horizontal component of the force. Furthermore, because the first rib 512 and the second rib 522 are inclined relative to the first direction X... Since the tilting directions of direction X are opposite, the horizontal component forces borne by the first rib 512 and the second rib 522 are in opposite directions. Thus, at least part of the horizontal component forces borne by the first rib 512 and the second rib 522 can cancel each other out. This helps to reduce the risk of relative movement of the first plate 51 and the second plate 52 in a direction perpendicular to the first direction X, and reduces the risk of swaying of the second buffer support assembly 50 in a direction perpendicular to the first direction. This further helps to improve the support stability of the second buffer support assembly 50 under external loads.

[0157] In some embodiments, such as Figure 7 , Figure 8 and Figure 10 As shown, a plurality of first ribs 512 are spaced apart along the second direction Y, and a plurality of second ribs 522 are spaced apart along the second direction Y. The first direction X and the second direction Y intersect, and along the second direction Y, the orthographic projections of the first ribs 512 and the orthographic projections of the second ribs 522 overlap.

[0158] The first rib 512 and the second rib 522 overlap in their orthographic projections along the second direction Y. Under external loads such as impact or vibration, the first plate 511 and the second plate 521 deform along the first direction X toward each other. The first rib 512 is more likely to abut against the second plate 521, and the second rib 522 is more likely to abut against the first plate 511. When the first rib 512 abuts against the second plate 521, and the second rib 522 abuts against the first plate 511, the second buffer support assembly 50 has higher support stability.

[0159] Therefore, by setting the orthographic projection of the first rib 512 and the orthographic projection of the second rib 522 to overlap along the second direction Y, it is beneficial to improve the support stability of the second buffer support assembly 50 on the first buffer support assembly 40 and the battery cell 30.

[0160] In some embodiments, such as Figure 7 , Figure 8 and Figure 10 As shown, the first rib 512 and / or the second rib 522 extend along the third direction Z.

[0161] Thus, when the second buffer support assembly 50 deforms under external load, the first plate 51 and the second plate 52 displace towards each other along the first direction X. The first rib 512 abuts against the second plate 521, and the second rib 522 abuts against the first plate 511. By setting the first rib 512 to extend along the third direction Z, it is beneficial to improve the support stability of the first rib 512 on the second plate 521. Similarly, setting the second rib 522 to extend along the third direction Z, it is beneficial to improve the support stability of the second rib 522 on the first plate 511. This further improves the support stability of the second buffer support assembly 50 under external impact or vibration loads.

[0162] In some embodiments, the first buffer support assembly 40, the first plate 51, and the second plate 52 are integrally formed.

[0163] For example, the first buffer support assembly 40, the first plate 51, and the second plate 52 can be integrally formed using a specific mold and an extrusion profile process. Specifically, the corresponding profile is provided with specific plates, reinforcing ribs, and cavity structures. Then, using a specific mold, pressure is applied to both sides of the profile along the first direction X to form structures such as the corresponding first rib 512, second rib 522, first buffer cavity 40c, and second buffer cavity 50a.

[0164] By making the first buffer support assembly 40, the first plate 51 and the second plate 52 integrally formed, it is beneficial to simplify the production process of the battery device 10, improve the production efficiency of the battery device 10, and improve the connection stability of the first buffer support assembly 40, the first plate 51 and the second plate 52.

[0165] In some embodiments, such as Figure 4 , Figure 6 and Figure 7 As shown, the first direction X is parallel to the direction of gravity G, and the first wall 313 of the battery cell 30 is supported by the first buffer support assembly 40.

[0166] In this way, the first buffer support assembly 40 and the second buffer support assembly 50 are respectively located below the battery cell 30 along the direction of gravity G. In the event of thermal runaway of the battery cell 30, its emissions can be discharged into the bottom buffer pressure relief chamber 40a, which helps to reduce the impact of emissions generated by thermal runaway on the battery cell 30 or other components in the housing 11a. In the embodiment where the battery device 10 is applied to the vehicle 1, the emissions are discharged in a direction away from the passenger compartment, which can reduce the impact of emissions on the occupants of the vehicle 1. Furthermore, the buffer pressure relief chamber 40a can be integrated with the space at the bottom of the housing 11, improving the space utilization and energy density of the battery device 10.

[0167] In some embodiments, such as Figure 4 , Figure 7 and Figure 9 As shown, the battery cell 30 also includes an electrode terminal 34, and the housing 31 also includes a second wall 314. The second wall 314 and the first wall 313 are arranged opposite to each other along the first direction X. The electrode terminal 34 is disposed on the second wall 314, and the first wall 313 is bonded to the first buffer support assembly 40.

[0168] The second wall 314 is located on the side of the outer shell 31 away from the first buffer support assembly 40 along the first direction X. The electrode terminal 34 is disposed on the second wall 314. The electrode terminal 34 and the pressure relief mechanism 33 are respectively disposed on opposite sides of the outer shell 31 along the first direction X.

[0169] Optionally, the first direction X can be set to be parallel to the gravity direction G, and the first wall 313 can be located at the bottom of the outer shell 31 along the gravity direction G, or the first wall 313 can be located at the top of the outer shell 31 along the gravity direction G.

[0170] Since the battery cell 30 needs to be electrically connected to other battery cells 30 through the electrode terminal 34, the electrode terminal 34 is an important current-carrying component of the battery cell 30. In the event of thermal runaway of the battery cell 30, the emissions are usually conductive. By setting the electrode terminal 34 on the second wall 314, the electrode terminal 34 is isolated from the emissions of the battery cell 30, reducing the risk of short circuit inside the battery device 10 caused by the emissions of the battery cell 30 coming into contact with the electrode terminal 34.

[0171] By bonding the first wall 313 to the first buffer support assembly 40, the connection reliability between the battery cell 30 and the first buffer support assembly 40 is improved, thereby improving the support stability of the housing 11 for the battery cell 30 and improving the overall structural stability of the battery device 10.

[0172] In some embodiments, such as Figure 5 , Figure 6 , Figure 7 , Figure 9 and Figure 10 As shown, the first buffer support assembly 40 includes at least one first hole group, the first hole group includes a plurality of first through holes 40b arranged at intervals along the third direction Z, the plurality of first through holes 40b in the same first hole group are respectively connected to the same buffer pressure relief chamber 40a, and the plurality of pressure relief mechanisms 33 of the plurality of battery cells 30 in the same battery cell assembly 20 are respectively arranged in a one-to-one correspondence with the plurality of first through holes 40b in the same first hole group.

[0173] The battery device 10 may include one or more battery cell assemblies 20. The pressure relief mechanism 33 of each battery cell 30 in the battery cell assembly 20 is arranged one-to-one with multiple first through holes 40b in the same first hole group, and the multiple first through holes 40b in the same first hole group are respectively connected to the same buffer pressure relief chamber 40a.

[0174] Thus, in the event of thermal runaway of any one or more battery cells 30 in the same battery cell assembly 20, the emissions are discharged into the corresponding buffer pressure relief chamber 40a, and are discharged into a specific area or location under the guidance of the buffer pressure relief chamber 40a.

[0175] Therefore, with this configuration, in the event of thermal runaway of any one or more battery cells 30 in the same battery cell assembly 20, the emissions can flow along a specific path through the corresponding buffer pressure relief chamber 40a, reducing the risk of further spread of thermal runaway within the battery device 10 due to the random flow of emissions inside the housing 11. Furthermore, the one-to-one correspondence between the first through hole 40b and the pressure relief mechanism 33 improves the isolation effect between the pressure relief mechanism 33 and the buffer pressure relief chamber 40a, reducing the risk of thermal runaway spreading between multiple battery cells 30 in the same battery cell assembly 20.

[0176] In some embodiments, such as Figure 5 , Figure 6 , Figure 7 and Figure 9 As shown, the first buffer support assembly 40 includes at least two first hole groups arranged along the second direction Y, and the battery cell assembly 20, the first hole groups and the buffer pressure relief cavity 40a are arranged in a one-to-one correspondence.

[0177] Multiple battery cell assemblies 20 are arranged along the second direction Y. Since the battery cell assemblies 20, the first hole group and the buffer pressure relief chamber 40a are set in a one-to-one correspondence, the high-temperature and high-pressure emissions discharged by different battery cells 30 in different battery cell assemblies 20 under thermal runaway conditions flow to different buffer pressure relief chambers 40a. This reduces the risk that the emissions discharged by any battery cell 30 under thermal runaway will have an adverse effect on the battery cells 30 in other battery cell assemblies 20. This is beneficial to further reduce the risk of thermal runaway propagation inside the battery device 10 and improve the reliability of the battery device 10.

[0178] In some embodiments, such as Figure 7 and Figure 9 As shown, the housing 11 also includes a frame assembly 113, which is connected to both ends of the first buffer support assembly 40 along the third direction Z. The frame assembly 113 has a pressure relief channel 11b, and at least one end of the buffer pressure relief cavity 40a along the third direction Z is connected to the pressure relief channel 11b.

[0179] The first buffer support component 40 is connected to the frame component 113 at both ends along the third direction Z, so that the frame component 113 provides a certain support for the first buffer support component 40. The second buffer support component 50 can also be connected to the frame component 113 at both ends along the third direction Z, so that the frame component 113 provides a certain support for the first buffer support component 40 and the second buffer support component 50.

[0180] Specifically, such as Figure 7 , Figure 9 and Figure 10 As shown, the periphery of the second buffer support assembly 50 may be provided with a protruding connecting part, which can be connected to the frame assembly 113 by welding, fasteners, or other means. The frame assembly 113 may have a beam structure, and the cavity inside the beam structure forms a pressure relief channel 11b without using additional space inside the housing 11, which is beneficial to improving the space utilization rate inside the battery device 10 and thus improving the energy density of the battery device 10.

[0181] The buffer pressure relief chamber 40a can extend along the third direction Z. Optionally, the buffer pressure relief chamber 40a can be configured with pressure relief channels 11b at both ends along the third direction Z, so that the discharge from the buffer pressure relief chamber 40a can be discharged along the first direction X towards the two pressure relief channels 11b at both ends. Alternatively, the buffer pressure relief chamber 40a can be configured with one end connected to a pressure relief channel 11b along the third direction Z, while the other end is not connected to a pressure relief channel 11b, so that the discharge from the buffer pressure relief chamber 40a can be discharged along the third direction Z towards one end of the pressure relief channel 11b.

[0182] The battery device 10 may also have a pressure relief structure such as an explosion-proof valve. The pressure relief structure may be installed on the frame assembly 113 so that when the pressure in the pressure relief channel 11b reaches the threshold of the pressure relief structure, the pressure relief structure is actuated and the discharge in the pressure relief channel 11b is discharged, thereby reducing the risk of further spread of thermal runaway of the battery device 10.

[0183] When the first buffer support assembly 40 includes multiple mutually isolated buffer pressure relief chambers 40a, the same end of the multiple buffer pressure relief chambers 40a along the third direction Z can be connected to the same pressure relief channel 11b. Therefore, the pressure relief channel 11b can be extended a preset distance along the second direction Y so that the discharge in the multiple buffer pressure relief chambers 40a can be discharged into the same pressure relief channel 11b.

[0184] In this way, if any battery cell 30 inside the battery device 10 experiences thermal runaway, it can be discharged into the pressure relief channel 11b through the corresponding buffer pressure relief chamber 40a along a specific discharge path, and ultimately stored in the pressure relief channel 11b, or discharged to the outside of the battery device 10 through the pressure relief channel 11b. This helps to reduce the risk of the emissions causing adverse effects on other normally operating battery cells 30, and reduces the risk of further spread of thermal runaway inside the battery device 10.

[0185] In addition, since the emissions are emitted along a specific path, the requirements for thermal protection of the battery cell 30 are lower, which helps to reduce the amount of heat insulation components, such as mica or ceramic tape, so as to reduce the production cost and total weight of the battery device 10.

[0186] Secondly, the electrical device provided in the embodiments of this application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0187] The power supply device provided in this application embodiment has the same technical effect as the battery device 10 provided in any of the above embodiments, and will not be described again here.

[0188] In some embodiments, such as Figures 4 to 10As shown, the battery device 10 includes a housing 11 and at least two battery cell assemblies 20 arranged along the second direction Y. The housing 11 has a receiving cavity 11a. The housing 11 includes a first buffer support assembly 40 and a second buffer support assembly 50 stacked along the gravity direction G. The first buffer support assembly 40 is located on the side of the second buffer support assembly 50 facing the receiving cavity 11a. The first buffer support assembly 40 has a buffer pressure relief cavity 40a, a first buffer cavity 40c and a first through hole 40b. The first through hole 40b communicates with the buffer pressure relief cavity 40a, and the first buffer cavity 40c is isolated from the buffer pressure relief cavity 40a. A battery cell assembly 20 is housed within a receiving cavity 11a. The battery cell assembly 20 includes multiple battery cells 30 arranged along a third direction Z. Each battery cell 30 includes a housing 31 and a pressure relief mechanism 33. The housing 31 includes a first wall 313, and the pressure relief mechanism 33 is disposed on the first wall 313. The first wall 313 is supported by a first buffer support assembly 40. Along the gravity direction G, at least a portion of the pressure relief mechanism 33 is positioned opposite a first through-hole 40b. The first buffer support assembly 40 includes a first protective plate 41 and at least two support ribs 42. The first protective plate 41 has a first through-hole 40b. The two ends of the support ribs 42 along the gravity direction G are respectively connected to the first protective plate 41 and a second buffer support assembly 50. The first protective plate 41, the second buffer support assembly 50, and the at least three support ribs 42 enclose a buffer pressure relief cavity 40a. The at least three support ribs 42 include a first support rib, a second support rib, and a third support rib spaced apart along a second direction Y. A first supporting rib, a second supporting rib, a first protective plate 41, and a second buffer support assembly 50 are arranged to form a buffer pressure relief cavity 40a, and a second supporting rib, a third supporting rib, a first protective plate 41, and a second buffer support assembly 50 are arranged to form a first buffer cavity 40c. At least one supporting rib 42 includes a first part 421 and a second part 422 that are connected to each other. The first part 421 and the second part 422 are bent towards each other, and the end of the first part 421 away from the second part 422 is connected to the first protective plate 41. The end of the second part 422 away from the first part 421 is connected to the second buffer support assembly 50. The first part 421 and the second part 422 are respectively inclined relative to the direction of gravity G. The second buffer support assembly 50 includes a first plate 51, a second plate 52, and a second buffer cavity 50a. The first plate 51 and the second plate 52 are connected to each other and are at least partially spaced along the direction of gravity G. The second buffer cavity 50a is located between the first plate 51 and the second plate 52. The first plate 51 includes a first plate body 511 and a plurality of first ribs 512. The first ribs 512 are connected to the side of the first plate body 511 facing the second buffer cavity 50a, and the first ribs 512 are inclined relative to the direction of gravity G. The second plate 52 includes a second plate body 521 and a plurality of second ribs 522. The second ribs 522 are connected to the side of the second plate body 521 facing the second buffer cavity 50a, and the second ribs 522 are inclined relative to the direction of gravity G.The first rib 512 and the second rib 522 are spaced apart and point from the first plate 511 to the second plate 521. The first rib 512 and the second rib 522 are inclined in opposite directions relative to the gravity direction G. The support rib 42, the first rib 512 and the second rib 522 extend along the third direction Z. Multiple first ribs 512 are spaced apart along the second direction Y, and multiple second ribs 522 are spaced apart along the second direction Y. The third direction Z, the second direction Y and the gravity direction G intersect each other but are not coplanar. Along the second direction Y, the orthographic projections of the first rib 512 and the second rib 522 overlap. The first buffer support assembly 40, the first plate 51 and the second plate 52 are integrally formed. The battery cell 30 also includes an electrode terminal 34, and the housing 31 also includes a second wall 314. The second wall 314 and the first wall 313 are arranged opposite to each other along the direction of gravity G. The electrode terminal 34 is disposed on the second wall 314. The first wall 313 is bonded to the first buffer support assembly 40. The first buffer support assembly 40 includes a plurality of first hole groups. The first hole groups include a plurality of first through holes 40b arranged at intervals along the third direction Z. The buffer pressure relief cavity 40a extends along the third direction Z. The plurality of first through holes 40b in the same first hole group are respectively connected to the same buffer pressure relief cavity 40a. The plurality of pressure relief mechanisms 33 of the plurality of battery cells 30 in the same battery cell assembly 20 are respectively arranged one-to-one with the plurality of first through holes 40b in the same first hole group. The first buffer support assembly 40 includes at least two buffer pressure relief cavities 40a. The battery cell assembly 20, the first hole group and the buffer pressure relief cavity 40a are arranged one-to-one. The housing 11 also includes a frame assembly 113, which is connected to both ends of the first buffer support assembly 40 along the third direction Z. The frame assembly 113 has a pressure relief channel 11b, and at least one end of the buffer pressure relief chamber 40a along the third direction Z is connected to the pressure relief channel 11b.

[0189] The battery device 10 provided in this application embodiment includes a housing 11 comprising a first buffer support assembly 40 and a second buffer support assembly 50 stacked along the gravity direction G. The first buffer support assembly 40 has a buffer pressure relief chamber 40a and a first through hole 40b, with the first through hole 40b communicating with the buffer pressure relief chamber 40a. At least a portion of the pressure relief mechanism 33 of the battery cell 30 is disposed opposite to the first through hole 40b. In the event of thermal runaway of the battery cell 30, the buffer pressure relief chamber 40a can serve as a discharge channel for the internal emissions of the battery cell 30. Furthermore, since at least two buffer pressure relief chambers 40a are isolated from each other, in the event of thermal runaway of any battery cell 30... The emissions are discharged only into one buffer pressure relief chamber 40a, reducing the adverse effects on the battery cells 30 corresponding to other buffer pressure relief chambers 40a, thereby reducing the risk of further spread of thermal runaway inside the battery device 10. When the battery device 10 is subjected to external impacts or vibrations, the buffer pressure relief chamber 40a can provide clearance for the deformation of the first buffer support assembly 40, thus buffering and absorbing external vibrations or impacts. In this way, both the second buffer support assembly 50 and the first buffer support assembly 40 of the housing 11 can buffer and absorb external impacts or vibrations, reducing the damage to the battery cells 30 caused by external impacts or vibrations. Therefore, the battery device 10 provided in this application is beneficial to improving the reliability of the battery device 10.

[0190] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The housing has a receiving cavity, including a first buffer support assembly and a second buffer support assembly stacked along a first direction. The first buffer support assembly is disposed on the side of the second buffer support assembly facing the receiving cavity. The first buffer support assembly has a first through hole and at least two mutually isolated buffer pressure relief cavities. The first through hole communicates with any one of the buffer pressure relief cavities. At least two battery cell assemblies arranged along a second direction are housed within the receiving cavity. Each battery cell assembly includes multiple battery cells arranged along a third direction. The first direction, the second direction, and the third direction intersect each other but are not coplanar. Each battery cell includes a housing and a pressure relief mechanism. The housing includes a first wall, and the pressure relief mechanism is disposed on the first wall. The first wall abuts against the first buffer support assembly. Along the first direction, at least a portion of the pressure relief mechanism is disposed opposite to the first through hole. The buffer pressure relief chamber extends along the third direction, and at least two battery cell assemblies are respectively arranged corresponding to at least two buffer pressure relief chambers. Multiple pressure relief mechanisms of the same battery cell assembly are arranged opposite to the same buffer pressure relief chamber.

2. The battery device according to claim 1, characterized in that, The first buffer support assembly has a first buffer cavity, which is isolated from the buffer pressure relief cavity and is located on one side of at least one of the battery cells along the first direction.

3. The battery device according to claim 1, characterized in that, The first buffer support assembly includes a first protective plate and at least two support ribs. The first protective plate has a first through hole. The two ends of the support ribs along the first direction are respectively connected to the first protective plate and the second buffer support assembly. The support ribs extend along the third direction. The first protective plate, the second buffer support assembly, and the at least two support ribs surround and form the buffer pressure relief cavity.

4. The battery device according to claim 3, characterized in that, The first buffer support assembly includes at least three support ribs, and the at least three support ribs include a first support rib, a second support rib, and at least one third support rib that are spaced apart along the second direction; The first support rib, the second support rib, the first protective plate, and the second buffer support assembly form the buffer pressure relief cavity. The third support rib is provided on the side of the first support rib and / or the second support rib away from the buffer pressure relief cavity. The second support rib, the third support rib, the first protective plate, and the second buffer support assembly form a first buffer cavity. Or, the first support rib, the third support rib, the first protective plate, and the second buffer support assembly form a first buffer cavity. The first buffer cavity and the buffer pressure relief cavity are isolated from each other.

5. The battery device according to claim 3, characterized in that, At least one of the supporting ribs includes a first part and a second part that are connected to each other, the first part and the second part are bent into each other, and the end of the first part away from the second part is connected to the first protective plate, and the end of the second part away from the first part is connected to the second buffer support assembly.

6. The battery device according to claim 5, characterized in that, The first part and the second part are respectively inclined relative to the first direction, and the inclination directions of the first part and the second part relative to the first direction are opposite.

7. The battery device according to any one of claims 1 to 6, characterized in that, The second buffer support assembly includes a first plate, a second plate, and a second buffer cavity. The first plate and the second plate are connected to each other and are at least partially spaced along the first direction. The second buffer cavity is located between the first plate and the second plate.

8. The battery device according to claim 7, characterized in that, The first plate includes a first plate body and a plurality of first ribs, the first ribs being connected to the side of the first plate body facing the second buffer cavity; and / or, The second plate includes a second plate body and a plurality of second ribs, the second ribs being connected to the side of the second plate body facing the second buffer cavity.

9. The battery device according to claim 8, characterized in that, The first rib and the second rib are spaced apart. The first rib and the second rib are respectively inclined relative to the first direction and are parallel to the first direction from the first plate to the second plate. The inclination directions of the first rib and the second rib are opposite relative to the first direction.

10. The battery device according to claim 9, characterized in that, A plurality of first ribs are spaced apart along the second direction, and a plurality of second ribs are spaced apart along the second direction; Along the second direction, the orthographic projections of the first rib and the second rib partially overlap.

11. The battery device according to claim 8, characterized in that, The first rib and / or the second rib extend along the third direction.

12. The battery device according to claim 7, characterized in that, The first buffer support assembly, the first plate, and the second plate are integrally formed.

13. The battery device according to any one of claims 1 to 6, characterized in that, The first direction is parallel to the direction of gravity, and the first wall of the battery cell is supported by the first buffer support assembly.

14. The battery device according to any one of claims 1 to 6, characterized in that, The battery cell further includes electrode terminals, and the housing further includes a second wall. The second wall and the first wall are disposed opposite to each other along the first direction. The electrode terminals are disposed on the second wall, and the first wall is bonded to the first buffer support assembly.

15. The battery device according to any one of claims 1 to 6, characterized in that, The first buffer support assembly includes at least one first hole group, the first hole group includes a plurality of first through holes spaced apart along the third direction, the plurality of first through holes in the same first hole group are respectively connected to the same buffer pressure relief chamber, and the plurality of pressure relief mechanisms of the plurality of battery cells in the same battery cell assembly are respectively configured to correspond one-to-one with the plurality of first through holes in the same first hole group.

16. The battery device according to claim 15, characterized in that, The first buffer support assembly includes at least two first hole groups arranged along the second direction, and the battery cell assembly, the first hole groups and the buffer pressure relief cavity are arranged in a one-to-one correspondence.

17. The battery device according to any one of claims 1 to 6, characterized in that, The housing also includes a frame assembly connected to both ends of the first buffer support assembly along the third direction. The frame assembly has a pressure relief channel, and at least one end of the buffer pressure relief cavity along the third direction is connected to the pressure relief channel.

18. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 17, the battery device being used to provide electrical energy.

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