Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device comprises a box body, a pressure release valve, a gas guide piece and a plurality of battery monomers, and the pressure release valve is arranged on the box wall of the box body; the air guide part is arranged in the box body, a first channel and a second channel are arranged in the air guide part and both communicated to the pressure release valve, the first channel is provided with a first inlet, and the second channel is provided with a second inlet; the plurality of single batteries are accommodated in the box body, the plurality of single batteries comprise a first single battery and a second single battery, the volume energy density of the first single battery is higher than that of the second single battery, and a first pressure relief mechanism is arranged on one side, facing the gas guide piece, of the first single battery; a second pressure relief mechanism is arranged on one side, facing the gas guide piece, of the second battery monomer; the first inlet and the second inlet are respectively arranged corresponding to the first pressure relief mechanism and the second pressure relief mechanism. According to the battery device, the reliability can be improved.

Description

Technical Field

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

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0003] The development of battery technology must consider multiple design factors simultaneously. For example, how to improve the reliability of battery devices is an important research direction in the battery field. Utility Model Content

[0004] The present application provides a battery device and an electrical device, which can improve heat dissipation performance and reliability.

[0005] In the first aspect, an embodiment of the present application provides a battery device, including a box body, a pressure relief valve, an air guide and a plurality of battery cells, the pressure relief valve is arranged on the box wall of the box body; the air guide is arranged in the box body, and a first channel and a second channel are arranged in the air guide, the first channel and the second channel are both connected to the pressure relief valve, the first channel is provided with a first inlet, and the second channel is provided with a second inlet; a plurality of battery cells are accommodated in the box body, the plurality of battery cells include a first battery cell and a second battery cell, the volume energy density of the first battery cell is higher than the volume energy density of the second battery cell, a first pressure relief mechanism is provided on the side of the first battery cell facing the air guide, and a second pressure relief mechanism is provided on the side of the second battery cell facing the air guide, and the first inlet and the second inlet are respectively provided corresponding to the first pressure relief mechanism and the second pressure relief mechanism.

[0006] In the technical solution of the embodiment of the present application, a plurality of battery cells and an air guide are arranged in the box body of the battery device, and a pressure relief valve is arranged on the box wall of the box body. The plurality of battery cells include a first battery cell and a second battery cell with different volume energy density. A first channel and a second channel are correspondingly arranged in the air guide. The first inlet and the second inlet on the two channels are respectively arranged corresponding to the pressure relief mechanisms in the two battery cells, so that the pressure relief mechanisms in the two battery cells are relieved and exhausted through two channels separated from each other, thereby reducing the impact on other battery cells when thermal runaway occurs in some battery cells, improving reliability, and at the same time, the heat dissipation channel area of ​​the battery cells can be increased by setting the air guide, thereby improving the heat dissipation performance.

[0007] According to some embodiments of the present application, a first pressure relief mechanism is provided in a one-to-one correspondence with the first inlet, and a second pressure relief mechanism is provided in a one-to-one correspondence with the second inlet; in the thickness direction of the air guide, the orthographic projection of the first pressure relief mechanism is located within the orthographic projection of the first inlet, and the orthographic projection of the second pressure relief mechanism is located within the orthographic projection of the second inlet. Placing the corresponding pressure relief mechanism directly opposite the inlet of the channel provides a larger connecting area between the two, improving fluid transmission efficiency and reducing the possibility of leakage.

[0008] According to some embodiments of the present application, in the thickness direction, the distance between the edge of the orthographic projection of the first pressure relief mechanism and the edge of the orthographic projection of the first inlet is L1, and the distance between the edge of the orthographic projection of the second pressure relief mechanism and the edge of the orthographic projection of the second inlet is L2, and 0.5 mm ≤ L1 ≤ 3.5 mm, and 0.5 mm ≤ L2 ≤ 3.5 mm. This allows the air guide channel inlet to have a larger and more appropriate area than the pressure relief mechanism.

[0009] According to some embodiments of the present application, each first battery cell includes at least two first pressure relief mechanisms, and each second battery cell includes fewer second pressure relief mechanisms than the first pressure relief mechanisms of the first battery cells. The first battery cells have a higher energy density and gas production rate, and accordingly, multiple pressure relief mechanisms may be provided to improve the overall reliability of the battery device.

[0010] According to some embodiments of the present application, the housing extends in a first direction longer than in a second direction, and both the first and second channels extend in the second direction, with the first and second directions intersecting. Extending the two air-guiding channels in the direction of the smaller housing dimension allows fluid entering the channels to be discharged more quickly, further improving heat dissipation performance.

[0011] According to some embodiments of the present application, multiple battery cells constitute one or more battery modules extending along a first direction, and in each battery module, the first battery cell and the second battery cell are arranged in the first direction; or, multiple battery cells constitute one or more battery modules extending along the first direction, and the battery module includes a first battery module composed of the first battery cell and a second battery module composed of the second battery cell, and the first battery module and the second battery module are arranged along a second direction, and the first direction and the second direction intersect. The battery cells in the box can be arranged into more than one battery module, and the same battery module can include only one type of battery cell, or the same battery module can be composed of two types of battery cells alternating.

[0012] According to some embodiments of the present application, multiple battery cells form multiple battery modules extending along a first direction. In each battery module, the first battery cell and the second battery cell are arranged in the first direction. The air guide includes multiple air guide sub-sections, which are arranged one-to-one with the battery modules. Each air guide sub-section includes a first channel and a second channel. By providing two channels in the air guide sub-sections corresponding to the battery modules, heat dissipation performance can be improved while ensuring more uniform heat generation in the battery modules.

[0013] According to some embodiments of the present application, each gas-guiding sub-unit includes one second channel and two first channels, with the two first channels located on opposite sides of the second channel perpendicular to its own extension direction. Providing two first channels for first battery cells with higher energy density and greater gas production further improves heat dissipation efficiency.

[0014] According to some embodiments of the present application, the cross-sectional area of ​​the second channel, as seen in a section perpendicular to the thickness direction, decreases as the air guide moves away from the first battery cell. This allows the second channel to have a larger cross-sectional area near the second pressure relief mechanism, thereby facilitating the diffusion of high-temperature, high-pressure fluid and reducing the impact of the fluid.

[0015] According to some embodiments of the present application, the second channel is smaller than the first and second channels in the thickness direction of the air guide. The air guide sub-unit further includes a connecting channel, which is located on the side of the second channel facing away from the second battery cell and connects between the two first channels. The connecting channel extends parallel to the first channels. The two first channels, located on either side of the second channel, can be interconnected through the connecting channel, further increasing the volume of the first channel and thereby improving heat dissipation efficiency.

[0016] According to some embodiments of the present application, along the arrangement direction of the battery cells, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered. By adjusting the positions of the pressure relief mechanisms, the possibility of interference between the channels corresponding to the two pressure relief mechanisms is reduced.

[0017] According to some embodiments of the present application, pressure relief valves are provided on opposite sides of the housing along the extension direction of the first and second channels. The first channel is connected to the pressure relief valves at both ends, and the second channel is connected to the pressure relief valves at both ends. Connecting both ends of the channels to the pressure relief valves on the housing further improves the efficiency and reliability of fluid discharge in the event of thermal runaway.

[0018] According to some embodiments of the present application, the battery device further includes an adhesive layer, through which the battery cells are bonded to the air guide. In the thickness direction of the air guide, the orthographic projection of the adhesive layer is staggered with the orthographic projections of the first pressure relief mechanism, the second pressure relief mechanism, the first inlet, and the second inlet. The battery cells and the air guide can be bonded to ensure a stable connection. Adjusting the position of the adhesive layer can also reduce the possibility of the adhesive interfering with the flow efficiency of the exhaust.

[0019] According to some embodiments of the present application, a battery cell has an electrode terminal. The electrode terminal and the first pressure relief mechanism of a first battery cell are respectively disposed on opposite sides, while the electrode terminal and the second pressure relief mechanism of a second battery cell are respectively disposed on opposite sides. Placing the pressure relief mechanisms on both battery cells on the side opposite the electrode terminals provides ample mounting area for the pressure relief mechanisms and reduces damage to connectors and the like on the terminal side during thermal runaway.

[0020] According to some embodiments of the present application, the air guide is adhesively connected, detachably connected, or integrally formed with the box body. The air guide can be fixedly connected, detachably connected, or integrally formed with the box body to improve adaptability and reduce processing requirements.

[0021] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device according to any embodiment of the first aspect, wherein the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0023] Figure 1 A simplified schematic diagram of a vehicle provided for some embodiments of the present application;

[0024] Figure 2 An exploded schematic diagram of a battery device provided in some embodiments of the present application;

[0025] Figure 3 A schematic structural diagram of a battery device provided in some embodiments of the present application;

[0026] Figure 4 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0027] Figure 5 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0028] Figure 6 A schematic structural diagram of the air guide sub-unit provided in some embodiments of the present application;

[0029] Figure 7 A schematic diagram of the partial structure of the air guide sub-section provided in some embodiments of the present application.

[0030] Reference numerals:

[0031] 1000-vehicles;

[0032] 100-battery device; 200-controller; 300-motor;

[0033] 10- box body; 20- pressure relief valve; 30- air guide; 40- battery cell;

[0034] 31 - first channel; 32 - second channel; 33 - air guide sub-portion; 34 - communication channel; 41 - first battery cell; 42 - second battery cell; 43 - battery module; 44 - electrode terminal;

[0035] 311 - first inlet; 321 - second inlet; 411 - first pressure relief mechanism; 421 - second pressure relief mechanism;

[0036] X-first direction; Y-second direction; Z-thickness direction. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0045] In the embodiment of the present application, the battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0046] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited to this.

[0047] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode and a negative electrode. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released back and forth between the positive and negative electrodes.

[0048] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0049] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0050] The battery apparatus mentioned in the embodiments of the present 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 hybrid via a busbar.

[0051] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0052] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with a cable tie.

[0053] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0054] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0055] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0056] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0057] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0058] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0059] A battery device typically contains multiple battery cells, which generate heat during operation. The specific amount of heat and gas generated is related to parameters such as the positive and negative electrode materials used. Battery cells are typically equipped with pressure relief mechanisms, such as explosion-proof valves, to relieve pressure in the event of thermal runaway. In the event of thermal runaway, the high-temperature, high-pressure fluid inside the battery cell can be ejected through the pressure relief mechanism.

[0060] However, in some existing battery devices, to balance the heat generated by each battery cell, multiple different battery cells may be installed simultaneously within the battery device. These battery cells have different volumetric energy densities and gas generation rates and may be arranged alternately within the battery device. In such battery devices, thermal runaway of different battery cells can easily interfere with each other, adversely affecting battery cells that have not yet experienced thermal runaway. Furthermore, the pressure relief channels in existing battery devices are relatively small, preventing rapid heat dissipation and reducing the overall reliability of the battery device.

[0061] In view of this, an embodiment of the present application provides a technical solution, in which an air guide is provided to provide exhaust channels separated from each other and having a certain cross-sectional area for battery cells of different energy densities, thereby effectively improving heat dissipation efficiency and reliability.

[0062] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries, such as mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., among which spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0063] The battery cells described in the embodiments of the present application are not limited to being applicable to the electrical equipment described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0064] See also Figure 1 , Figure 1 A simplified schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 may be provided inside the vehicle 1000. Specifically, for example, the battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used, for example, to control the battery to power the motor 300. The battery device 100 may be used for starting and navigating the vehicle 1000. Of course, the battery device 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0065] In the battery device 100, there can be one or more battery cells 40. If there are multiple battery cells 40, the multiple battery cells 40 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 40. The multiple battery cells 40 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit formed by the multiple battery cells 40 is housed within the housing 10. Alternatively, multiple battery cells 40 can be first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10.

[0066] In some embodiments, there are multiple battery cells 40 , which are first connected in series, in parallel, or in series to form a battery module. The multiple battery modules are then connected in series, in parallel, or in series to form a whole, which is then housed in the box 10 .

[0067] Next, combine the Figure 2 To the attached Figure 7 The structures of the battery device 100 and the electrical equipment provided in the embodiments of the present application are described.

[0068] Please also refer to Figures 2 to 4 , Figure 2 Schematic diagram of an explosion of a battery device provided in some embodiments of the present application. Figure 3 This is a schematic diagram of the structure of a battery device provided in some embodiments of the present application. Figure 4 A schematic structural diagram of a battery cell provided in some embodiments of the present application.

[0069] In the first aspect, the embodiment of the present application provides a battery device 100, including a box body 10, a pressure relief valve 20, an air guide 30 and a plurality of battery cells 40, wherein the pressure relief valve 20 is arranged on the box wall of the box body 10; the air guide 30 is arranged on the box body 10, and a first channel 31 and a second channel 32 are provided in the air guide 30, and the first channel 31 and the second channel 32 are both connected to the pressure relief valve 20, the first channel 31 is provided with a first inlet 311, and the second channel 32 is provided with a second inlet 321; the plurality of battery cells 40 are provided. The plurality of battery cells 40 are housed in the box body 10, including a first battery cell 41 and a second battery cell 42. The volume energy density of the first battery cell 41 is higher than the volume energy density of the second battery cell 42. A first pressure relief mechanism 411 is provided on the side of the first battery cell 41 facing the air guide 30, and a second pressure relief mechanism 421 is provided on the side of the second battery cell 42 facing the air guide 30. The first inlet 311 and the second inlet 321 are respectively provided to correspond to the first pressure relief mechanism 411 and the second pressure relief mechanism 421.

[0070] The present application provides a battery device 100, which includes a box body 10 for providing protection and accommodation functions, an air guide 30 and a plurality of battery cells 40 arranged in the box body 10, and a plurality of pressure relief valves 20 are arranged on the box wall of the box body 10. The pressure relief valves 20 are used to discharge the gas inside the box body 10, and can be similar to the pressure relief mechanism arranged on the battery cell 40, adopting a structural form of destroying the weak part under high temperature and high pressure to form an opening or channel for internal pressure or temperature to be released.

[0071] Optionally, multiple pressure relief valves 20 can be provided in the box body 10 at the same time, and these pressure relief valves 20 can be respectively provided on multiple different walls of the box body 10 to achieve faster pressure relief; or, the box body 10 can be provided with only one pressure relief valve 20, and the exhaust channels in the box body 10 can be gathered so that they are all connected to the same pressure relief valve 20.

[0072] In the box body 10, the pressure relief valve 20 can be arranged on the side wall, top wall or bottom wall of each wall portion of the box body 10, and can be optionally arranged on the bottom wall of the box body 10, that is, on the side away from the user after the box body 10 is installed in the electrical device, so as to further improve the reliability of the battery device 100.

[0073] The air guide 30 is disposed within the housing 10 and is used to guide and cool the fluid discharged from the battery cells 40. Specifically, the air guide 30 can be a plate-shaped member disposed within the housing 10. Furthermore, the air guide 30 can have openings corresponding to the pressure relief mechanisms provided on the battery cells 40. This allows the fluid, consisting of gases discharged from the battery cells 40 during thermal runaway and the electrolytes entrained in the gases, to enter the air guide 30. The fluid then flows to the pressure relief valve 20 according to the direction of the exhaust passage within the air guide 30, where it is discharged from the battery device 100.

[0074] The housing 10 also houses multiple battery cells 40, including a first battery cell 41 with a higher volumetric energy density and a second battery cell 42 with a lower volumetric energy density. Both cells are equipped with a first pressure relief mechanism 411 and a second pressure relief mechanism 421, respectively. Due to the difference in energy density between the two battery cells 40, there are also certain differences in the heat generation, gas production efficiency, and spray valve strength of the two batteries when the pressure relief mechanisms are activated during operation. The first battery cell 41, while having a higher volumetric energy density, can simultaneously have greater heat generation, gas production efficiency, and spray valve strength than the second battery cell 42.

[0075] Optionally, the first battery cell 41 may be a battery cell 40 using lithium transition metal oxides and their modified compounds as the positive electrode active material, and the second battery cell 42 may be a battery cell 40 using lithium phosphates and their modified compounds as the positive electrode active material. Furthermore, the first battery cell 41 may be a ternary polymer lithium battery, and the second battery cell 42 may be a lithium iron phosphate battery. By combining two batteries with different materials and different heat outputs, the advantages of both can be complemented, balancing the overall service life and energy density of the battery device 100.

[0076] It is understood that in the embodiment of the present application, the first battery cell 41 and the second battery cell 42 have different gas production efficiencies and spray valve strengths. This parameter difference may be caused by the difference in volumetric energy density of the battery cells 40. Alternatively, this parameter difference may be caused by the difference in battery capacity between the first battery cell 41 and the second battery cell 42, that is, the capacity of the first battery cell 41 is greater than the capacity of the second battery cell 42. This application does not impose any specific limitations on this, and it is sufficient that the first channel 31 and the second channel 32 are respectively applied to battery cells 40 with two different pressure relief strengths.

[0077] As an example, when the internal pressure or temperature of the battery cell 40 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 40 reaches a predetermined threshold, the pressure relief mechanism performs an action or the weak structure provided 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 according to different design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell 40. Optionally, the first battery cell 41 and the second battery cell 42 may have different pressure relief thresholds.

[0078] As an example, the pressure relief mechanism can be integrally formed with the housing, or can be separately provided and connected to the housing. "Actuation" of the pressure relief mechanism as referred to in this application means that the pressure relief mechanism is actuated or activated to a certain state, thereby allowing the internal pressure and temperature of the battery cell 40 to be released.

[0079] The fluid from the battery cell 40 mentioned in this application is a general term for the emissions ejected during the pressure relief process, which may specifically include but is 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.

[0080] Corresponding to the two battery cells 40, the air guide 30 can be provided with two pressure relief channels, one for guiding the exhaust from the first battery cell 41 and the other for guiding the exhaust from the second battery cell 42. The pressure relief mechanisms of the two battery cells 40 can be located on the same side to facilitate communication with the air guide 30. In the air guide 30, the first channel 31 is provided with multiple first inlets 311 corresponding to the first pressure relief mechanisms 411, and the second channel 32 is provided with multiple second inlets 321 corresponding to the second pressure relief mechanisms 421.

[0081] It can be understood that the first channel 31 and the second channel 32 in the air guide 30 are respectively connected to the pressure relief valve 20. The connection here means that one end of the channel extends to the location of the pressure relief valve 20 on the box body 10, and enables the high-temperature, high-pressure exhaust flowing along the channel to act on the pressure relief valve 20. Under a certain pressure, the pressure relief valve 20 is activated to discharge the fluid exhaust in the channel from the position of the pressure relief valve 20.

[0082] Taking the first channel 31 and the first battery cell 41 as an example, there is a small distance between the side surface of the first battery cell 41 on which the first pressure relief mechanism 411 is provided and the side surface of the air guide 30 facing the battery cell 40, and they can be optionally directly connected to reduce the leakage of emissions during the pressure relief process and reduce interference with other battery cells 40.

[0083] The first channel 31 may be provided with one or more first inlets 311. These first inlets 311 are arranged in correspondence with each first pressure relief mechanism 411 along the thickness direction Z of the air guide 30, and may be arranged in a one-to-one or one-to-many correspondence. Along the thickness direction Z, the orthographic projection of each first pressure relief mechanism 411 at least partially overlaps with the orthographic projection of the first inlet 311. This allows emissions generated within the battery cells 40 to flow into the first channel 31 through the first pressure relief mechanisms 411 and the first inlets 311 in the event of thermal runaway, then flow along the first channel 31 to the pressure relief valve 20 on the housing 10, and ultimately be discharged outside the housing 10.

[0084] The correspondence between the second channel 32 and the second pressure relief mechanism 421 may be similar to the correspondence between the first channel 31 and the first pressure relief mechanism 411 , and will not be described in detail in this application.

[0085] Optionally, in the air guide 30, to ensure that the first inlet 311 and the second inlet 321 correspond to the first pressure relief mechanism 411 and the second pressure relief mechanism 421, the extension direction and shape of the first channel 31 and the second channel 32 can be configured accordingly based on the location and arrangement of the two types of battery cells 40. For example, in an embodiment where the battery cells 40 are arranged in an array, the first channel 31 and the second channel 32 can extend linearly or in a serpentine manner along the rows or columns of the battery cells 40, so that the same channel can accommodate multiple battery cells 40.

[0086] It can be understood that the battery cell 40 in the embodiment of the present application can be a square shell battery with an outer shell close to that of a rectangular parallelepiped, or the battery cell 40 can be a cylindrical battery with an outer shell close to that of a cylinder. The present application does not make any specific limitation on this, and it is only necessary that the pressure relief mechanism can be set at a position that is compatible with the air guide 30.

[0087] In the technical solution of the embodiment of the present application, a plurality of battery cells 40 and an air guide 30 are arranged in the box body 10 of the battery device 100, and a pressure relief valve 20 is arranged on the box wall of the box body 10. The plurality of battery cells 40 include a first battery cell 41 and a second battery cell 42 with different volume energy densities. A first channel 31 and a second channel 32 are correspondingly arranged in the air guide 30. The first inlet 311 and the second inlet 321 on the two channels are respectively arranged corresponding to the pressure relief mechanisms in the two battery cells 40, so that the pressure relief mechanisms in the two battery cells 40 are relieved and exhausted through two separate channels, thereby reducing the impact on other battery cells 40 when thermal runaway occurs in some battery cells 40, improving reliability, and at the same time, the heat dissipation channel area of ​​the battery cell 40 can be increased by setting the air guide 30, thereby improving the heat dissipation performance.

[0088] In some optional embodiments, the first pressure relief mechanism 411 is arranged in a one-to-one correspondence with the first inlet 311, and the second pressure relief mechanism 421 is arranged in a one-to-one correspondence with the second inlet 321; in the thickness direction Z of the air guide 30, the orthographic projection of the first pressure relief mechanism 411 is located within the orthographic projection of the first inlet 311, and the orthographic projection of the second pressure relief mechanism 421 is located within the orthographic projection of the second inlet 321.

[0089] Optionally, to ensure good airtightness between the air guide 30 and the pressure relief mechanisms of the battery cells 40, the first pressure relief mechanisms 411 can be provided in a one-to-one correspondence with the first inlets 311, and the second pressure relief mechanisms 421 can be provided in a one-to-one correspondence with the second inlets 321. Furthermore, each pair of corresponding inlets and pressure relief mechanisms can be arranged directly opposite each other in the thickness direction Z, with the area of ​​the inlet being larger than that of the corresponding pressure relief mechanism, so that during pressure relief, the battery cells 40 have a larger area in communication with the exhaust passage.

[0090] Optionally, the first inlet 311 and the second inlet 321 may be rectangular, circular, or runway-shaped with arcs at both ends, and their specific shapes may be consistent with the corresponding pressure relief mechanism. In each set of corresponding pressure relief mechanisms and inlets, along the thickness direction Z, the orthographic projection of the inlet and the orthographic projection of the pressure relief mechanism may have the same or similar shape and be concentrically arranged. The orthographic projection of the pressure relief mechanism may be located within the orthographic projection of the inlet, and the edges of the two may be spaced apart from each other.

[0091] Optionally, a seal may be further provided between the air guide 30 and the battery cell 40 . The seal may be provided around the pressure relief mechanism and the inlet to further improve the sealing performance during the pressure relief process and reduce the impact on other battery cells 40 .

[0092] By aligning the corresponding pressure relief mechanisms with the inlets of the channels, and positioning them directly opposite each other in the thickness direction Z, a larger interconnected area is created between the two, improving the flow efficiency of the exhaust during the pressure relief process and reducing the possibility of leakage. Furthermore, in embodiments where the inlets correspond to the pressure relief mechanisms, the inlets can also serve as positioning markers for the battery cells 40, improving assembly efficiency and positioning accuracy of the battery cells 40.

[0093] In some optional embodiments, in the thickness direction Z, the distance between the edge of the orthographic projection of the first pressure relief mechanism 411 and the edge of the orthographic projection of the first inlet 311 is L1, and the distance between the edge of the orthographic projection of the second pressure relief mechanism 421 and the edge of the orthographic projection of the second inlet 321 is L2, 0.5mm≤L1≤3.5mm, 0.5mm≤L2≤3.5mm.

[0094] In the aforementioned embodiments where the areas of each first inlet 311 and each second inlet 321 are respectively larger than the corresponding first pressure relief mechanism 411 and second pressure relief mechanism 421, there may be a certain distance between the edge of the pressure relief mechanism and the edge of the inlet to provide a certain processing allowance and installation allowance.

[0095] Specifically, taking the first inlet 311 and the first pressure relief mechanism 411 as an example, if both are orthographically projected along the thickness direction Z, then the distance between the edges of the orthographic projections of each corresponding first pressure relief mechanism 411 and first inlet 311 can be denoted as L1. It will be understood that this distance refers to the distance between the edges of the orthographic projection of the first pressure relief mechanism 411 and the edges of the orthographic projection of the first inlet 311, in the direction from the center of the orthographic projection of the first pressure relief mechanism 411 to the edge of the first inlet 311. Alternatively, this distance can refer to the minimum distance between a point on the edge of the orthographic projection of the first pressure relief mechanism 411 and the edge of the orthographic projection of the first inlet 311.

[0096] The distance between the orthographic projection edge of the second inlet 321 and the orthographic projection edge of the first pressure relief mechanism 411 is recorded as L2. The calculation method of this distance is the same as the calculation method of the distance L1, and this application will not repeat it here.

[0097] Optionally, the spacing L1 and the spacing L2 may both be between 0.5 mm and 3.5 mm, and may further be between 1 mm and 3 mm, for example, any one of 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm, or between any two thereof.

[0098] On the basis that the orthographic projection area of ​​the opening is larger than the orthographic projection area of ​​the corresponding pressure relief mechanism, the area difference between the pressure relief mechanism and the inlet can be adjusted more conveniently by adjusting the spacing between the two orthographic projection edges. Thus, on the basis of making the connecting opening between the battery cell 40 and the channel have a larger area, the possibility of mutual interference between adjacent inlets and the possibility of interference with adjacent battery cells 40 during pressure relief are reduced. At the same time, the side surface of the channel where the inlet is provided can maintain a higher structural strength, reducing the possibility of deformation of the side surface.

[0099] In some optional embodiments, each first battery cell 41 includes at least two first pressure relief mechanisms 411 , and the number of the second pressure relief mechanisms 421 of each second battery cell 42 is less than the number of the first pressure relief mechanisms 411 of the first battery cell 41 .

[0100] Optionally, the first battery cell 41 and the second battery cell 42 may have different numbers of pressure relief mechanisms, depending on parameters such as volumetric energy density, gas production efficiency, and spray valve strength. For example, the first battery cell 41 with higher volumetric energy density and gas production efficiency may have two or more first pressure relief mechanisms 411 . These first pressure relief mechanisms 411 may all be located on the same surface and correspond to the first inlet 311 . Alternatively, the multiple first pressure relief mechanisms 411 of the first battery cell 41 may be located on multiple different surfaces, with the first pressure relief mechanism 411 located on the side surface closest to the air guide 30 corresponding to the first inlet 311 .

[0101] The second battery cell 42 may optionally be provided with more than one second pressure relief mechanism 421 . Meanwhile, the number of the second pressure relief mechanisms 421 on each second battery cell 42 may be smaller than the number of the first pressure relief mechanisms 411 on each first battery cell 41 to adapt to different gas production efficiencies.

[0102] For example, each first battery cell 41 may have two first pressure relief mechanisms 411 spaced apart and both located near a side surface of the air guide 30 , and each second battery cell 42 may have one second pressure relief mechanism 421 .

[0103] By adjusting the number of pressure relief mechanisms on different battery cells 40 , it is possible to adapt to battery cells 40 with different energy densities, thereby improving the overall reliability of the battery device 100 .

[0104] In some optional embodiments, the extension dimension of the box body 10 in the first direction X is greater than the extension dimension of the box body 10 in the second direction Y, and both the first channel 31 and the second channel 32 extend along the second direction Y.

[0105] Optionally, the housing 10 in the battery device 100 can be rectangular, polygonal, or other shapes with relatively regular outer edges to facilitate installation on an electrical device. The housing 10 can have different extensions in the intersecting first and second directions X and Y, with the first and second directions Y optionally being perpendicular to each other. Optionally, in embodiments where multiple battery cells 40 are arranged in an array, the first and second directions Y can be the row and column directions, respectively, of the battery cells 40.

[0106] In an embodiment where the dimension of the housing 10 extending along the first direction X is greater than the dimension extending along the second direction Y, each of the first channels 31 and the second channels 32 in the air guide 30 may optionally extend along the second direction Y, that is, along the direction in which the dimension of the housing 10 is smaller, so as to shorten the length of the channel. This can further increase the speed at which emissions such as high-temperature, high-pressure gases are discharged from the battery, thereby further improving the heat dissipation performance and reliability of the battery device 100.

[0107] In some optional embodiments, multiple battery cells 40 constitute one or more battery modules 43 extending along the first direction X, and in each battery module 43, the first battery cell 41 and the second battery cell 42 are arranged in the first direction X; or, multiple battery cells 40 constitute one or more battery modules 43 extending along the first direction X, the battery module 43 includes a first battery module 43 composed of the first battery cell 41 and a second battery module 43 composed of the second battery cell 42, the first battery module 43 and the second battery module 43 are arranged along the second direction Y, and the first direction X intersects with the second direction Y.

[0108] The multiple battery cells 40 in the battery device 100 can be arranged in various configurations within the housing 10. For example, the multiple battery cells 40 can form one or more battery modules 43, each of which includes a first battery cell 41 and a second battery cell 42. The two types of battery cells 40 can be arranged alternately along the arrangement direction, and can further be arranged one-to-one, to further ensure more uniform heat generation throughout the battery device 100. Furthermore, in embodiments comprising multiple battery modules 43, these battery modules 43 can be arranged along a second direction Y that intersects the first direction X. The arrangement of the first battery cells 41 and the second battery cells 42 in each battery module 43 can be the same or different.

[0109] Alternatively, the plurality of battery cells 40 can be distinguished as first battery cells 41 and second battery cells 42 to form a plurality of battery modules 43. That is, the same battery module 43 is composed of the same type of battery cells 40, with the first battery cells 41 and the second battery cells 42 forming the first battery module and the second battery module, respectively. The battery cells 40 in the same battery module 43 are arranged along the first direction X, while the first battery module and the second battery module are arranged along the second direction Y. Optionally, the arrangement can be alternating one by one.

[0110] In the above two embodiments, the setting positions and extension trajectories of the first channel 31 and the second channel 32 in the air guide 30 can both correspond to the battery cell 40. It is only necessary that the inlet of the channel is set corresponding to the pressure relief mechanism and at least one end of the channel can be connected to the pressure relief valve 20.

[0111] The battery cells 40 in the battery device 100 can be arranged in different ways according to parameters such as heat generation and shape, so as to improve the applicability of the air guide 30 and the overall performance of the battery device 100 .

[0112] Please also refer to Figures 5 to 7 , Figure 5 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application. Figure 6 This is a schematic diagram of the structure of the air guide sub-unit provided in some embodiments of the present application. Figure 7 A schematic diagram of the partial structure of the air guide sub-section provided in some embodiments of the present application.

[0113] In some optional embodiments, multiple battery cells 40 constitute multiple battery modules 43 extending along the first direction X. In each battery module 43, the first battery cell 41 and the second battery cell 42 are arranged in the first direction X. The air guide 30 includes multiple air guide sub-sections 33, and the air guide sub-sections 33 are arranged one-to-one corresponding to the battery modules 43. Each air guide sub-section 33 includes a first channel 31 and a second channel 32.

[0114] As mentioned above, the multiple battery cells 40 in the battery device 100 can be arranged in a variety of different ways. In an embodiment where the battery device 100 includes multiple battery modules 43, and each battery module 43 includes both a first battery cell 41 and a second battery cell 42, the air guide 30 can be provided with multiple air guide sub-sections 33 corresponding to the battery modules 43, which can be optionally arranged in a one-to-one correspondence.

[0115] Each air guide sub-section 33 is provided with a first channel 31 and a second channel 32 . The extension direction of these two channels can be the same as the extension direction of the air guide sub-section 33 and the arrangement direction of the battery cells 40 , so as to correspond to the arrangement of the batteries.

[0116] Optionally, in each air guiding sub-section 33, both ends of the first channel 31 and the second channel 32 can be located at opposite ends in the length direction of the battery module 43, that is, in the arrangement direction of the battery cells 40, and then directly connected to the pressure relief valve 20 on the box wall; or, both ends of the first channel 31 and the second channel 32 can be respectively connected to the first channel 31 and the second channel 32 in the adjacent air guiding sub-section 33, and then connected to the pressure relief valve 20 on the box wall after passing through multiple air guiding sub-sections 33.

[0117] By providing two channels in each air-guiding sub-section 33 corresponding to a battery module 43, heat dissipation performance can be improved while ensuring more uniform heat distribution within the battery module 43. Furthermore, by providing multiple air-guiding sub-sections 33, the first channel 31 and second channel 32 corresponding to each battery module 43 are independently provided, further minimizing the impact of pressure relief on other battery cells 40.

[0118] In some optional embodiments, each air guiding sub-portion 33 includes a second channel 32 and two first channels 31 , and the two first channels 31 are respectively located on opposite sides of the second channel 32 in a direction perpendicular to the second channel 32 's own extension direction.

[0119] Optionally, the air guide sub-section 33 may include a second channel 32 and two first channels 31 extending parallel to each other, and the two first channels 31 are respectively arranged on both sides of the second channel 32, and the first pressure relief mechanism 411 and the second pressure relief mechanism 421 on the battery cell 40 can adopt corresponding setting positions.

[0120] Optionally, the two first channels 31 may have the same or similar width, area, etc., so that both can provide high exhaust efficiency. The channels in the air guide sub-section 33 may further be arranged symmetrically about a reference plane, which may be a plane perpendicular to the arrangement direction of the two second channels 32.

[0121] Corresponding to the setting positions of the first channel 31 and the second channel 32, the second pressure relief mechanism 421 on the second battery cell 42 can be set at a position close to the center area on the corresponding surface, and the multiple first pressure relief mechanisms 411 on the first battery cell 41 can be spaced apart from each other and symmetrically set on both sides of the center area, so that the corresponding first channel 31 and the second channel 32 can have a more regular extension trajectory.

[0122] For example, in the embodiment of the present application, the first battery cell 41 is provided with two pressure relief mechanisms and the second battery cell 42 is provided with one pressure relief mechanism. However, it should be understood that the present application is not limited to this. The first battery cell 41 and the second battery cell 42 can also be provided with more pressure relief mechanisms, and more channels can be correspondingly provided in the air guide sub-section 33, or the same channel in the air guide sub-section 33 can correspond to more pressure relief mechanism settings.

[0123] By providing two first channels 31 in the air guide sub-portion 33 for the first battery cells 41 with higher energy density and more gas production, the cross-sectional area of ​​the exhaust channel corresponding to the first battery cells 41 can be specifically increased, thereby further improving the heat dissipation efficiency.

[0124] In some optional embodiments, in a direction away from the second battery cell 42 along the thickness direction Z of the air guide 30 , the cross-sectional area of ​​the second channel 32 formed in a cross section perpendicular to the thickness direction Z tends to decrease.

[0125] The second channel 32 in the air guide sub-portion 33 can have a cross-sectional area that gradually changes in the thickness direction Z. Specifically, the second channel 32 is intercepted by multiple sections perpendicular to the thickness direction Z, so that the second channel 32 forms a cross-sectional figure on each section. Then, in the direction away from the second battery cell 42 along the thickness direction Z, the area of ​​each cross-sectional figure tends to decrease. The structural form can be selected to be a uniform gradual decrease or a step-by-step decrease, so that the second channel 32 has a structural form that is wide at the top and narrow at the bottom.

[0126] Alternatively, if the second channel 32 is cut perpendicularly to its extension direction, the resulting cross-sectional shapes can be in the form of an inverted trapezoid, semicircle, semi-ellipse, or other shapes that are wider at the top and narrower at the bottom. An inverted trapezoid is preferred for a more regular shape and easier processing. When the cross-sectional area is perpendicular to the extension direction of the second channel 32, the cross-sectional areas and dimensions of the second channel 32 at all locations along its own extension direction can be the same or similar.

[0127] By making the second channel 32 have a larger cross-sectional area near the second pressure relief mechanism 421, a larger buffer space can be provided for the exhaust just when it is ejected from the second battery cell 42, so that the high-temperature, high-pressure fluid can diffuse first at this position, thereby reducing the impact of the fluid and reducing the impact on other battery cells 40.

[0128] In some optional embodiments, in the thickness direction Z of the air guide 30, the size of the second channel 32 is smaller than the size of the first channel 31; the air guide sub-portion 33 also includes a connecting channel 34, which is arranged on the side of the second channel away from the second battery cell 42 and is connected between the two first channels 31, and the connecting channel 34 extends parallel to the first channel 31.

[0129] Optionally, in the thickness direction Z of the air guide 30, one end of the second channel 32 extends to the upper surface of the air guide 30 to be connected with the second pressure relief mechanism 421, while the other end may not extend to the bottom surface of the air guide 30, that is, there may be a certain gap between the bottom surface of the second channel 32 and the bottom surface of the air guide 30, and the gap position can be used to form a connecting channel 34.

[0130] Optionally, a connecting channel 34 is formed between a side wall of the second channel 32 away from the second battery cell 42 and a side wall of the air guide 30 away from the second battery cell 42, and serves to interconnect the two first channels 31 located on either side of the second channel 32, thereby integrating the exhaust spaces corresponding to the second pressure relief mechanism 421. The shape and size of the connecting channel 34 can be determined based on the difference between the depth of the second channel 32 and the thickness of the air guide 30.

[0131] Optionally, the connecting channel 34 can have the same or similar dimensions as the second channel 32 in the directions in which the first channel 31 and the second channel 32 extend, so that all portions of the second channel 32 can be relatively evenly interconnected. Providing the connecting channel 34 can further expand the area of ​​the second channel 32, providing more space for the discharge ejected from the first battery cell 41 during thermal runaway, thereby further improving heat dissipation efficiency.

[0132] In some optional embodiments, along the arrangement direction of the battery cells 40 , the orthographic projection of the first pressure relief mechanism 411 and the orthographic projection of the second pressure relief mechanism 421 are staggered with each other.

[0133] In embodiments where each battery module 43 includes both a first battery cell 41 and a second battery cell 42, the first pressure relief mechanism 411 and the second pressure relief mechanism 421 can be positioned so as not to overlap on the surface of the corresponding battery cell 40. Specifically, if the two pressure relief mechanisms are simultaneously orthographically projected along the direction in which the battery cells 40 are arranged, i.e., the first direction X, the orthographic projection of the first pressure relief mechanism 411 and the orthographic projection of the second pressure relief mechanism 421 can be non-overlapping. The orthographic projections of multiple second pressure relief mechanisms 421 can be respectively positioned on either side of the orthographic projection of the first pressure relief mechanism 411, and the number of orthographic projections on both sides can be the same.

[0134] Optionally, in the first direction X, the orthographic projections of the first pressure relief mechanisms 411 can overlap, and the orthographic projections of the second pressure relief mechanisms 421 can be divided according to the installation position and number, so that the orthographic projections of the second pressure relief mechanisms 421 in the same group overlap. This can further stabilize the installation positions of the first inlet 311 and the second inlet 321 and facilitate processing.

[0135] By adjusting the position of the pressure relief mechanism, the position and extension direction of the first channel 31 and the second channel 32 in the air guide sub-section 33 can be adjusted accordingly. Setting the two pressure relief mechanisms so that their orthographic projections do not overlap with each other can reduce the possibility of interference between the corresponding first channel 31 and the second channel 32, making it easier to set the two channels to extend along a straight line to facilitate the derivation of the fluid.

[0136] In some optional embodiments, pressure relief valves 20 are provided on opposite side walls of the box body 10 in the extension direction of the first channel 31 and the second channel 32, and both ends of the first channel 31 are respectively connected to the pressure relief valves 20, and both ends of the second channel 32 are respectively connected to the pressure relief valves 20.

[0137] Optionally, in order to further improve heat dissipation efficiency and reliability, the efficiency of discharging high-temperature, high-pressure fluid out of the battery can be improved by providing pressure relief valves 20 at both ends of the first channel 31 and the second channel 32 .

[0138] Specifically, the housing 10 has two opposing side walls extending in the direction of the first channel 31 and the second channel 32. Multiple pressure relief valves 20 can be provided on each of these side walls, so that both ends of each first channel 31 and second channel 32 can be connected to a pressure relief valve 20. By using different pressure relief valves 20 for each channel, the channels can be further isolated from each other, further reducing the impact of thermal runaway on other channels and other battery cells 40.

[0139] Optionally, when channels extending in different directions are provided in the air guide 30 , pressure relief valves 20 may be provided at both ends of each channel, not just at the two side walls.

[0140] It will be appreciated that the present embodiment of the present application uses the example of the pressure relief valve 20 being disposed on the side wall of the housing 10 for illustration, but it should be understood that the present application is not limited thereto. The position of the pressure relief valve 20 can be adjusted accordingly based on parameters such as the structure of the housing 10, the structure of the air guide 30, and the location of the battery device 100 within the electrical equipment. For example, the pressure relief valve 20 can be disposed directly on the side wall, or located at the end of the first channel 31 or the second channel 32 and disposed on the bottom wall. Alternatively, another air guide structure extending along the thickness direction Z of the battery device 100 can be disposed at the end of the first channel 31 or the second channel 32, and the pressure relief valve 20 can be disposed on the top wall of the housing 10. The present application does not impose any specific limitations on this, as long as the exhaust can be discharged from the battery device 100 via the pressure relief valve 20.

[0141] In some optional embodiments, the battery device 100 further includes an adhesive layer, and the battery cell 40 is adhesively connected to the air guide 30 via the adhesive layer; in the thickness direction Z of the air guide 30, the orthographic projection of the adhesive layer is staggered with the orthographic projection of the first pressure relief mechanism 411, the orthographic projection of the second pressure relief mechanism 421, the orthographic projection of the first inlet 311, and the orthographic projection of the second inlet 321.

[0142] To ensure a stable and reliable connection between the battery cells 40 and the air guide 30, they can optionally be bonded. Specifically, the battery assembly 100 also includes an adhesive layer, which is disposed between the battery cells 40 and the air guide 30 and serves to secure their relative positions. When applying the adhesive layer, the bonding can be performed on the relatively flat surfaces of the battery cells and the air guide 30, avoiding the inlets and pressure relief mechanisms.

[0143] Optionally, the adhesive layer can maintain a certain distance from each inlet and the pressure relief mechanism. Optionally, if the adhesive layer, first inlet 311, second inlet 321, first pressure relief mechanism 411, and second pressure relief mechanism 421 are orthographically projected along the thickness direction Z, the orthographic projection of the adhesive layer and the orthographic projections of the other four are staggered, and a certain gap can be provided between the orthographic projection of the adhesive layer and the orthographic projections of the other four to reduce the possibility of the adhesive layer entering the first inlet 311 or the second inlet 321 and affecting the pressure relief rate.

[0144] Providing an adhesive connection between the battery cell 40 and the air guide 30 can make the connection between the two stable and reliable. At the same time, by adjusting the position of the connection layer, the possibility of the adhesive material interfering with the flow efficiency can be reduced, further improving the reliability of the battery device 100.

[0145] In some optional embodiments, the battery cell 40 has an electrode terminal 44 , the electrode terminal 44 of the first battery cell 41 and the first pressure relief mechanism 411 are respectively arranged on opposite sides, and the electrode terminal 44 of the second battery cell 42 and the second pressure relief mechanism 421 are respectively arranged on opposite sides.

[0146] The battery cell 40 may be provided with an electrode terminal 44 for electrical connection to external components. The electrode terminal 44 is typically provided protruding from one side of the battery cell 40. In both the first battery cell 41 and the second battery cell 42, the electrode terminal 44 may be provided on the side opposite the pressure relief mechanism. This reduces the possibility of interference between the electrode terminal 44 and the connector provided at the terminal and the passageway in the air guide 30, and also reduces the possibility of damage to the connector caused by discharge during pressure relief. Furthermore, arranging the electrode terminal 44 and the pressure relief mechanism on opposite sides allows the surface of the battery cell 40 on the side where the pressure relief mechanism is provided to be relatively flat, facilitating connection with the air guide 30.

[0147] Alternatively, in the battery device 100, the electrode terminals 44 of the battery cells 40 can be positioned near the top plate, while the pressure relief mechanism can be positioned near the bottom plate, and the air guide 30 can be positioned between the battery cells 40 and the bottom plate. This allows the battery cells 40 to release pressure downward in the event of thermal runaway, minimizing damage to other components above and to operators.

[0148] The pressure relief mechanisms on both battery cells 40 are arranged on the other side opposite to the electrode terminal 44 , so that the pressure relief mechanisms have a relatively sufficient installation area and reduce damage to connectors on the terminal side during thermal runaway.

[0149] In some optional embodiments, the air guide 30 is adhesively connected to the box body 10, detachably connected, or integrally formed.

[0150] The air guide 30 is arranged in the box body 10 and is used to provide a channel for the emissions generated when the battery cell 40 thermally runs away to flow outside the box body 10. The air guide 30 can be set as a component independent of the box body 10 and connected to the inner side of the box wall of the box body 10. It can be fixedly connected by bonding, welding, etc. to make the connection stable; or, the air guide 30 can be detachably connected to the box body 10 by snapping, crimping, fastener connection, etc., so as to facilitate the maintenance or replacement of the air guide 30; or, the air guide 30 can be set as an integral part of the box body 10, that is, the first channel 31 and the second channel 32 can be directly set in the box wall of the box body 10, and can be optionally set in the bottom plate of the box body 10, so that the air guide 30 is a part of the box body 10, thereby further improving the position stability and structural strength of the air guide 30.

[0151] In a second aspect, an embodiment of the present application provides an electrical device, comprising the battery device 100 in any embodiment of the first aspect, wherein the battery device 100 is used to provide electrical energy.

[0152] The electrical equipment provided in the embodiments of the present application has all the beneficial effects of the battery device 100 in any of the embodiments of the first aspect described above. For details, please refer to the specific description of the battery device 100 in the above embodiments, which will not be repeated in this embodiment.

[0153] The present application provides a battery device 100, including a housing 10, a pressure relief valve 20, an air guide 30, and a plurality of battery cells 40. The pressure relief valve 20 is disposed on a wall of the housing 10. The air guide 30 is disposed in the housing 10 and has a first channel 31 and a second channel 32 therein. Both the first channel 31 and the second channel 32 are connected to the pressure relief valve 20. The first channel 31 has a first inlet 311, and the second channel 32 has a second inlet 321. The plurality of battery cells 40 are accommodated in the housing 10. The plurality of battery cells 40 include a first battery cell 41 and a second battery cell 42. The volume energy density of the first battery cell 41 is higher than that of the second battery cell 42. A first pressure relief mechanism 411 is disposed on a side of the first battery cell 41 facing the air guide 30, and a second pressure relief mechanism 421 is disposed on a side of the second battery cell 42 facing the air guide 30. The first inlet 311 and the second inlet 321 are disposed corresponding to the first pressure relief mechanism 411 and the second pressure relief mechanism 421, respectively.

[0154] The multiple battery cells 40 form multiple battery modules 43 extending along a first direction X. In each battery module 43, the first battery cell 41 and the second battery cell 42 are arranged in the first direction X. The air guide 30 includes multiple air guide sub-sections 33, each corresponding to a battery module 43. Each air guide sub-section 33 includes a second channel 32 and two first channels 31, with the two first channels 31 located on opposite sides of the second channel 32 perpendicular to its own extension direction. In the thickness direction Z of the air guide 30, the second channel 32 is smaller than the first channel 31. The air guide sub-section 33 also includes a connecting channel 34, which is located on the side of the second channel facing away from the second battery cell 42 and connects the two first channels 31.

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Box; A pressure relief valve is provided on the box wall of the box body; an air guide member disposed in the box body, wherein a first channel and a second channel are disposed in the air guide member, wherein the first channel and the second channel are both connected to the pressure relief valve, wherein the first channel is provided with a first inlet, and the second channel is provided with a second inlet; A plurality of battery cells are accommodated in the box, the plurality of battery cells include a first battery cell and a second battery cell, the volume energy density of the first battery cell is higher than the volume energy density of the second battery cell, a first pressure relief mechanism is provided on the side of the first battery cell facing the air guide, a second pressure relief mechanism is provided on the side of the second battery cell facing the air guide, and the first inlet and the second inlet are respectively provided corresponding to the first pressure relief mechanism and the second pressure relief mechanism.

2. The battery device according to claim 1, wherein: The first pressure relief mechanism is provided in a one-to-one correspondence with the first inlet, and the second pressure relief mechanism is provided in a one-to-one correspondence with the second inlet; In the thickness direction of the air guide, the orthographic projection of the first pressure relief mechanism is located within the orthographic projection of the first inlet, and the orthographic projection of the second pressure relief mechanism is located within the orthographic projection of the second inlet.

3. The battery device according to claim 2, characterized in that In the thickness direction, the distance between the edge of the orthographic projection of the first pressure relief mechanism and the edge of the orthographic projection of the first inlet is L1, and the distance between the edge of the orthographic projection of the second pressure relief mechanism and the edge of the orthographic projection of the second inlet is L2, 0.5mm≤L1≤3.5mm, 0.5mm≤L2≤3.5mm.

4. The battery device according to claim 1, wherein: Each of the first battery cells includes at least two of the first pressure relief mechanisms, and the number of the second pressure relief mechanisms of each of the second battery cells is less than the number of the first pressure relief mechanisms of the first battery cells.

5. The battery device according to claim 1, wherein: An extension dimension of the box body in the first direction is greater than an extension dimension of the box body in the second direction. Both the first channel and the second channel extend along the second direction. The first direction intersects with the second direction.

6. The battery device according to claim 1, wherein: The plurality of battery cells constitute one or more battery modules extending along a first direction, and in each of the battery modules, the first battery cells and the second battery cells are arranged in the first direction; Alternatively, the plurality of battery cells constitute one or more battery modules extending along a first direction, the battery modules comprising a first battery module constituted by the first battery cells and a second battery module constituted by the second battery cells, the first battery module and the second battery module are arranged along a second direction, and the first direction intersects with the second direction.

7. The battery device according to claim 1, wherein: The plurality of battery cells constitute a plurality of battery modules extending along a first direction, and in each of the battery modules, the first battery cells and the second battery cells are arranged in the first direction; The air guide member includes a plurality of air guide sub-parts, each of which is arranged in a one-to-one correspondence with the battery modules, and each of the air guide sub-parts includes a first channel and a second channel.

8. The battery device according to claim 7, characterized in that Each of the air guiding sub-portions includes one second channel and two first channels, and the two first channels are respectively located on two opposite sides of the second channel in a direction perpendicular to the second channel's own extension direction.

9. The battery device according to claim 7, wherein: In a direction away from the second battery cell along the thickness direction of the air guide, the area of ​​a cross-sectional pattern formed by the second channel in a cross section perpendicular to the thickness direction tends to decrease.

10. The battery device according to claim 7, characterized in that In the thickness direction of the air guide, the size of the second channel is smaller than that of the first channel; The air guide sub-unit further includes a communication channel, which is provided on a side of the second channel away from the second battery cell and communicates between two first channels. The communication channel extends parallel to the first channels.

11. The battery device according to claim 7, wherein: Along the arrangement direction of the battery cells, the orthographic projection of the first pressure relief mechanism and the orthographic projection of the second pressure relief mechanism are staggered with each other.

12. The battery device according to claim 1, wherein: In the extension direction of the first channel and the second channel, pressure relief valves are provided on opposite side walls of the box body, both ends of the first channel are connected to the pressure relief valves respectively, and both ends of the second channel are connected to the pressure relief valves respectively.

13. The battery device according to claim 1, wherein: The battery device further includes an adhesive layer, and the battery cell is adhesively connected to the air guide through the adhesive layer; In the thickness direction of the air guide, the orthographic projection of the adhesive layer is staggered with the orthographic projections of the first pressure relief mechanism, the second pressure relief mechanism, the first inlet, and the second inlet.

14. The battery device according to claim 1, wherein: The battery cells have electrode terminals. The electrode terminals and the first pressure relief mechanism of the first battery cell are respectively disposed on two opposite sides. The electrode terminals and the second pressure relief mechanism of the second battery cell are respectively disposed on two opposite sides.

15. The battery device according to claim 1, wherein: The air guide is connected to the box body by bonding, detachable connection or integrally formed.

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

Images