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 single batteries, the pressure release valve is arranged on the box wall of the box body; the air guide part is arranged in the box body and comprises a first sub-part provided with a first channel and a second sub-part provided with a second channel, and the first sub-part and the second sub-part are arranged on the two opposite sides in the box body respectively; the battery monomers are accommodated in the box body and are positioned between the first sub-component and the second sub-component, the battery monomers comprise a first battery monomer and a second battery monomer, the volume energy density of the first battery monomer is higher than that of the second battery monomer, and the first battery monomer and the second battery monomer are respectively provided with a first pressure relief mechanism and a second pressure relief mechanism; the first sub-component and the second sub-component are provided with a first inlet communicated with the first channel and a second inlet communicated with the second channel respectively, and the first inlet and the second inlet correspond to the first pressure relief mechanism and the second pressure relief mechanism respectively. According to the battery device, the heat dissipation efficiency and reliability can be improved.

Description

Technical Field

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

[0002] 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 at the same time. For example, how to improve the heat dissipation efficiency and reliability of the battery 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 efficiency and reliability.

[0005] In one aspect, an embodiment of the present application provides a battery device comprising a housing, a pressure relief valve, an air guide, and a plurality of battery cells, wherein the pressure relief valve is arranged on the wall of the housing; the air guide is arranged in the housing, the air guide comprises a first sub-component provided with a first channel and a second sub-component provided with a second channel, the first channel and the second channel are both connected to the pressure relief valve, and the first sub-component and the second sub-component are respectively arranged on opposite sides of the housing; a plurality of battery cells are accommodated in the housing and are at least partially located between the first sub-component and the second sub-component, the plurality of battery cells comprise a first battery cell and a second battery cell, the volume energy density of the first battery cell being higher than the volume energy density of the second battery cell, a first pressure relief mechanism being provided on a side of the first battery cell facing the first sub-component, and a second pressure relief mechanism being provided on a side of the second battery cell facing the second sub-component; wherein the first sub-component is provided with a first inlet communicated with the first channel, the second sub-component is provided with a second inlet communicated with the second channel, and the first inlet and the second inlet are respectively arranged 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, 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, wherein the plurality of battery cells include a first battery cell and a second battery cell with different volume energy density, the air guide includes a first sub-component and a second sub-component arranged relatively to each other, and the two sub-components at least partially clamp the battery cell therebetween, and are respectively provided with a first channel and a second channel, the first sub-component and the second sub-component are respectively arranged corresponding to the pressure relief mechanisms in the two battery cells through the first inlet and the second inlet on the two channels, so that the pressure relief mechanisms in the two battery cells are relieved and exhausted through the two channels separated from each other, and the exhaust channels respectively arranged on the opposite sides of the battery cell can provide a larger exhaust space, reduce the impact on other battery cells when thermal runaway occurs in some battery cells, improve reliability, and at the same time increase the heat dissipation channel area of ​​the battery cell and improve 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 battery cells have electrode terminals, and the electrode terminals and the first pressure relief mechanism of the first battery cell are disposed on opposite sides, while the electrode terminals and the second pressure relief mechanism of the second battery cell are disposed on the same side. In a first battery cell having a large number of pressure relief mechanisms, the pressure relief mechanisms and the electrode terminals are disposed on opposite sides to reduce the possibility of interference between the pressure relief mechanisms and the electrode terminals within a limited space.

[0011] According to some embodiments of the present application, the second sub-assembly includes a main body and a protruding portion. The protruding portion protrudes from the main body toward the second battery cell, and the second inlet is provided on the protruding portion. The battery cell includes an electrode terminal and a housing. The electrode terminal of the second battery cell protrudes from the housing. In the thickness direction of the air guide, the protruding portion protrudes from the main body to a greater extent than the electrode terminal of the second battery cell protrudes from the housing. The protruding portion is provided in the second sub-assembly near the electrode terminal to reduce interference with the connector at the terminal while improving the airtightness between the second inlet and the second pressure relief mechanism.

[0012] According to some embodiments of the present application, a side surface of the protrusion facing away from the main body abuts against the outer shell of the second battery cell. Extending the protrusion to abut against the main body further improves airtightness and relative position stability between the second sub-component and the battery cell.

[0013] According to some embodiments of the present application, in a cross section perpendicular to the extension direction of the second sub-component, the cross-sectional shape formed by the protrusion is trapezoidal or rectangular, so that the protrusion is easy to process and can relatively stably abut against the surface of the battery cell.

[0014] According to some embodiments of the present application, multiple battery cells are arranged along a first direction or a second direction, with the first direction intersecting the second direction. The housing extends in the first direction longer than in the second direction, and both the first and second channels extend in the second direction. 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.

[0015] According to some embodiments of the present application, multiple battery cells form 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 along the first direction; or, multiple battery cells form 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, with the first direction and the second direction intersecting. The battery cells in the housing can be arranged into one or more battery modules, making the arrangement of the multiple battery cells more flexible and adaptable to different parameter requirements.

[0016] According to some embodiments of the present application, pressure relief valves are provided on opposite side walls of the housing in the direction in which the first and second channels extend, with both ends of the first and second channels connected to the multiple pressure relief valves. 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.

[0017] According to some embodiments of the present application, the housing includes a top plate and a bottom plate disposed opposite each other, with the second sub-assembly disposed proximate the top plate and the first sub-assembly disposed proximate the bottom plate. The first sub-assembly, which dissipates heat for the first sub-assembly with a higher energy density, is disposed on the bottom plate to reduce the possibility of injury to operators and connecting structures above during operation.

[0018] According to some embodiments of the present application, the battery device further includes a first adhesive layer and a second adhesive layer. The first battery cell is adhesively connected to the first sub-assembly via the first adhesive layer, and the second battery cell is adhesively connected to the second sub-assembly via the second adhesive layer. In the thickness direction of the air guide, the orthographic projection of the first adhesive layer is staggered with the orthographic projection of the first pressure relief mechanism and the orthographic projection of the first inlet, and the orthographic projection of the second adhesive layer is staggered with the orthographic projection of the second pressure relief mechanism and the orthographic projection of the second inlet. The battery cell and the first and second sub-assemblies of the air guide can be adhesively connected to ensure a stable connection. At the same time, by adjusting the position of the adhesive layer, the possibility of the adhesive material interfering with the flow efficiency of the exhaust gas is reduced.

[0019] 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.

[0020] According to some embodiments of the present application, a first battery cell includes a first positive electrode active material comprising a lithium transition metal oxide or a modified compound thereof; a second battery cell includes a second positive electrode active material comprising a lithium-containing phosphate or a modified compound thereof. The two battery cells can use different positive electrode materials, thereby having different volumetric energy densities, allowing the different types of battery cells to complement each other.

[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 2An 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 cell provided in some embodiments of the present application;

[0026] Figure 4 A schematic structural diagram of a first sub-component 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 a second sub-component provided in some embodiments of the present application;

[0029] Figure 7 A schematic structural diagram of the second sub-component provided for some other 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 subassembly; 32 - second subassembly; 41 - first battery cell; 42 - second battery cell; 43 - battery module; 44 - electrode terminal;

[0035] 311 - first channel; 312 - first inlet; 321 - second channel; 322 - second inlet; 323 - main body; 324 - protrusion; 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 leverage the complementary advantages of parameters such as heat generation and service life among individual battery cells, multiple different battery cells can be simultaneously installed within the device. These battery cells have varying volumetric energy densities and gas production rates, and can be arranged alternately within the device. In such battery devices, thermal runaway can easily interfere with each other, adversely affecting cells that haven't 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 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 battery devices and electrical equipment using battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., wherein 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., and 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 device described in the embodiments of the present application is 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 may be provided inside the vehicle 1000. Specifically, for example, a battery may be provided at the bottom, front or rear of the vehicle 1000. The battery may be used to power the vehicle 1000. For example, the battery 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 may be used for starting and navigating the vehicle 1000. Of course, the battery 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 a battery, 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 within 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 cell 40 can be 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 43, and then the multiple battery modules 43 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 43 . The multiple battery modules 43 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 structure of the battery device 100 will be described.

[0068] Please also refer to Figures 2 to 6 , 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 cell provided in some embodiments of the present application. Figure 4 A schematic structural diagram of the first sub-component provided in some embodiments of the present application, Figure 5 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application. Figure 6 A schematic structural diagram of the second sub-component 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 the air guide 30 includes a first sub-component 31 provided with a first channel 311 and a second sub-component 32 provided with a second channel 321, the first channel 311 and the second channel 321 are both connected to the pressure relief valve 20, and the first sub-component 31 and the second sub-component 32 are respectively arranged on opposite sides of the box body 10; the plurality of battery cells 40 are accommodated in the box body 10 and are at least partially located between the first sub-component 31 and the second sub-component 32, and the plurality of battery cells 40 are accommodated in the box body 10 and are at least partially located between the first sub-component 31 and the second sub-component 32. The battery cell 40 includes 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 first sub-component 31, and a second pressure relief mechanism 421 is provided on the side of the second battery cell 42 facing the second sub-component 32; wherein, the first sub-component 31 is provided with a first inlet 312 connected to the first channel 311, and the second sub-component 32 is provided with a second inlet 322 connected to the second channel 321, and the first inlet 312 and the second inlet 322 are respectively provided corresponding 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. Two or more pressure relief valves 20 can be provided on the box wall of the box body 10. The pressure relief valve 20 is used to discharge the gas inside the box body 10, and can be similar to the pressure relief mechanism provided 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 emissions, consisting of gases discharged from the battery cells 40 during thermal runaway and electrolytes entrained in the gases, to enter the air guide 30. The exhaust passage within the air guide 30 then extends in the direction of the exhaust passage, allowing the fluid to flow to the pressure relief valve 20, where it is then 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] 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 sub-assembly 31 and the second sub-assembly 32 are respectively applied to battery cells 40 with two different pressure relief strengths.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] It can be understood that the first channel 311 and the second channel 321 in the two sub-components 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.

[0080] Corresponding to the two battery cells 40, the air guide 30 includes a first sub-component 31 and a second sub-component 32. The two sub-components are arranged opposite each other within the box body 10, optionally in the thickness direction Z of the top or bottom plate of the box body 10, and are respectively arranged on either side of the battery cell 40. The first sub-component 31 and the second sub-component 32 can be connected to the box body 10 by adhesive bonding, clamping, crimping, fastening, or welding, and can use the same or different connection methods.

[0081] The first subassembly 31 is provided with a first channel 311 and a first inlet 312 connected to the first channel 311. The first inlet 312 is provided in correspondence with the first pressure relief mechanism 411 and is used to divert the exhaust generated when the first battery elevator experiences thermal runaway. Similarly, the second subassembly 32 is provided with a second channel 321 and a second inlet 322 connected to the second channel 321. The second inlet 322 is provided in correspondence with the second pressure relief mechanism 421 and is used to divert the exhaust generated when the second battery elevator experiences thermal runaway.

[0082] Taking the first sub-component 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 first sub-component 31 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 subassembly 31 may be provided with one or more first inlets 312. These first inlets 312 are arranged in correspondence with each first pressure relief mechanism 411 in the thickness direction Z of the first subassembly 31, optionally 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 312. This allows, in the event of thermal runaway, emissions generated within the battery cells 40 to flow through the first pressure relief mechanisms 411 and the first inlets 312 into the first channel 311, then along the first channel 311 to the pressure relief valve 20 on the housing 10, and ultimately be discharged outside the housing 10.

[0084] Optionally, one or more first sub-components 31 may be provided in the box body 10, and each first sub-component 31 may be provided with one or more first channels 311. These first air channels may extend along a straight line or a curved trajectory. It is only necessary that each first pressure relief mechanism 411 can correspond to the first inlet 312, and each first inlet 312 can be connected to the first channel 311.

[0085] The correspondence between the second sub-component 32 and the second pressure relief mechanism 421 may be similar to the correspondence between the first sub-component 31 and the first pressure relief mechanism 411 , and will not be described in detail in this application.

[0086] Optionally, in the air guide 30, to ensure that the first inlet 312 and the second inlet 322 correspond to the first pressure relief mechanism 411 and the second pressure relief mechanism 421, the extension direction and shape of the first channel 311 and the second channel 321 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 311 and the second channel 321 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.

[0087] 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.

[0088] In the technical solution of the embodiment of the present application, a plurality of battery cells 40 and an air guide 30 are provided in the box body 10 of the battery device 100, and a pressure relief valve 20 is provided 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 having different volume energy densities. The air guide 30 includes a first sub-component 31 and a second sub-component 32 arranged opposite to each other. The two sub-components at least partially sandwich the battery cells 40 therebetween and are respectively provided with a first channel 311 and a second channel 321. The first sub-component 31 and the second sub-component 32 are respectively arranged corresponding to the pressure relief mechanisms in the two battery cells 40 through the first inlet 312 and the second inlet 322 on the two channels, so that the pressure relief mechanisms in the two battery cells 40 can relieve pressure and exhaust gas through two channels separated from each other, and the exhaust channels respectively arranged on the opposite sides of the battery cells 40 can provide a larger exhaust space, reducing the impact on other battery cells 40 when thermal runaway occurs in some battery cells 40, improving reliability, and at the same time increasing the heat dissipation channel area of ​​the battery cells 40 and improving heat dissipation performance.

[0089] In some optional embodiments, the first pressure relief mechanism 411 is arranged in a one-to-one correspondence with the first inlet 312, and the second pressure relief mechanism 421 is arranged in a one-to-one correspondence with the second inlet 322; 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 312, and the orthographic projection of the second pressure relief mechanism 421 is located within the orthographic projection of the second inlet 322.

[0090] 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 312, and the second pressure relief mechanisms 421 can be provided in a one-to-one correspondence with the second inlets 322. 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.

[0091] Optionally, the first inlet 312 and the second inlet 322 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, the orthographic projection of the inlet and the orthographic projection of the pressure relief mechanism along the thickness direction Z may have the same or similar shapes 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.

[0092] 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 .

[0093] 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.

[0094] 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 312 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 322 is L2, 0.5mm≤L1≤3.5mm, 0.5mm≤L2≤3.5mm.

[0095] In the aforementioned embodiments where the areas of each first inlet 312 and each second inlet 322 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.

[0096] Specifically, taking the first inlet 312 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 orthographic projection edges of each corresponding first pressure relief mechanism 411 and first inlet 312 can be recorded as L1. It will be understood that this distance refers to the distance between the orthographic projection edge of the first pressure relief mechanism 411 and the orthographic projection edge of the first inlet 312 in the direction from the center of the orthographic projection of the first pressure relief mechanism 411 to the edge of the first inlet 312. Alternatively, this distance can refer to the minimum distance between a point on the orthographic projection edge of the first pressure relief mechanism 411 and the orthographic projection edge of the first inlet 312.

[0097] The distance between the orthographic projection edge of the second inlet 322 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.

[0098] 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.

[0099] 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. Therefore, 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 due to the provision of multiple openings.

[0100] 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 .

[0101] 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, a 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 312 . Alternatively, the first pressure relief mechanisms 411 of the first battery cell 41 may be located on 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 312 .

[0102] 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.

[0103] For example, each first battery cell 41 may have two first pressure relief mechanisms 411 spaced apart and located on the same surface, and each second battery cell 42 may have one second pressure relief mechanism 421 .

[0104] 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 .

[0105] 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 arranged on opposite sides, and the electrode terminal 44 of the second battery cell 42 and the second pressure relief mechanism 421 are arranged on the same side.

[0106] In the battery device 100, at least some of the battery cells 40 may include a shell and electrode terminals 44 arranged on the shell. In order to facilitate electrical connection, the electrode terminals 44 are usually protruding from the shell. Each battery cell 40 can optionally be provided with two electrode terminals 44, which serve as the positive electrode and negative electrode of the battery cell 40 respectively.

[0107] Among the multiple battery cells 40 of the battery device 100, the first battery cell 41 has a larger volume energy density and more first pressure relief mechanisms 411. In order to provide sufficient installation space for the first pressure relief mechanism 411, the electrode terminal 44 of the first battery cell 41 and the first pressure relief mechanism 411 can be respectively located on opposite sides of the first battery cell 41, and the electrode terminal 44 of the second battery cell and the second pressure relief mechanism 421 can be arranged on the same side of the second battery cell.

[0108] By selecting the first battery cell 41 with a larger number of pressure relief mechanisms and arranging the pressure relief mechanisms and the electrode terminals 44 on opposite sides, the possibility of interference between the pressure relief mechanisms and the electrode terminals 44 in a limited space can be reduced.

[0109] See also Figure 7 , Figure 7 A schematic structural diagram of the second sub-component provided for some other embodiments of the present application.

[0110] In some optional embodiments, the second sub-component 32 includes a main body 323 and a protrusion 324, the protrusion 324 protrudes from the main body 323 in a direction close to the second battery cell 42, and the second inlet 322 is arranged on the protrusion 324; the battery cell 40 also includes a shell, and the electrode terminal 44 of the second battery cell 42 is protruded from the shell. In the thickness direction Z of the air guide 30, the size of the protrusion 324 protruding from the main body 323 is larger than the size of the electrode terminal 44 of the second battery cell 42 protruding from the shell.

[0111] In embodiments where the electrode terminals 44 of the second battery cell 42 protrude from the outer shell, the second pressure relief mechanism 421 and the electrode terminals 44 of the second battery cell 42 may be located on the same side, and the two electrode terminals 44 may be located on either side of the second pressure relief mechanism 421. Alternatively, the second subassembly 32 may include a main body 323 and a protruding portion 324. The main body 323 may be a plate-like member extending along a plane or a nearly plane curved surface. The protruding portion 324 protrudes from a side of the main body 323 proximal to the battery cell 40 toward the second pressure relief mechanism 421. The second inlet 322 is at least partially located on the protruding portion 324.

[0112] Optionally, in other directions intersecting with the extension direction of the second sub-component 32 , the width of the protrusion 324 may be greater than the width of the second inlet 322 , so that the second inlet 322 can be completely disposed on a side surface of the protrusion 324 facing the second battery cell 42 .

[0113] Optionally, along the extension direction of the second sub-component 32, each second sub-component 32 can be provided with a protrusion 324 extending in the same direction as itself as a whole, and all the second inlets 322 of the second sub-component 32 are provided on the protrusion 324; or, each second sub-component can be provided with multiple protrusions 324, and these protrusions 324 can be arranged at intervals along the extension direction of the second sub-component 32 as a whole, and each protrusion 324 is provided with one or more second inlets 322.

[0114] In the battery device 100, to ensure smooth external electrical connection of the battery cells 40, their electrode terminals 44 are typically provided with connectors such as busbars. Therefore, the second subassembly 32 needs to be provided with a corresponding structure to provide clearance for the electrode terminals 44 and the busbars. Thus, the provision of the protrusion 324 shortens the distance between the second inlet 322 and the second pressure relief mechanism 421 while maintaining a distance between the second subassembly 32 and the busbars. This reduces the possibility of emissions leaking between the two during thermal runaway, thereby improving the reliability of the battery device 100.

[0115] In some optional embodiments, a side surface of the protrusion 324 facing away from the main body 323 abuts against the outer shell of the second battery cell 42 .

[0116] Optionally, by adjusting the size of the protrusion 324 protruding from the main body 323 and the size of the connector at the electrode terminal 44 protruding from the surface of the second battery cell 42 housing, the spacing between the protrusion 324 and the second battery cell 42 after the second sub-assembly 32 is mounted on the battery cell 40 can be adjusted accordingly. Furthermore, the protrusion 324 can be extended to a surface facing away from the main body 323 to abut against the housing of the second battery cell 42, thereby further improving the sealing performance at the second inlet 322.

[0117] Optionally, in an embodiment where the width dimension of the second battery cell 42 allows, a seal may be further provided around the second inlet 322, and the seal may be clamped between the surface of the protrusion 324 and the shell of the second battery cell 42, thereby further reducing the possibility of emissions leaking from the gap between the second sub-component 32 and the second pressure relief mechanism 421 in a thermal runaway state, thereby improving the reliability of the battery device 100.

[0118] By extending the protrusion 324 to abut against the main body 323 , the airtightness can be further improved while the relative position stability between the second sub-assembly 32 and the battery cell 40 can be enhanced.

[0119] In some optional embodiments, in a cross section perpendicular to the extension direction of the second sub-component 32 , the cross-sectional shape formed by the protrusion 324 is trapezoidal or rectangular.

[0120] In embodiments where the second sub-assembly 32 includes a main body 323 and a protrusion 324, the protrusion 324 can be shaped to facilitate machining and have a relatively flat surface. Specifically, by cutting the second sub-assembly 32 along a cross section perpendicular to the extension direction of the second sub-assembly 32, the resulting cross-sectional shape can be trapezoidal or rectangular, for example. This allows the protrusion 324 to be easily machined, less susceptible to compression deformation in the thickness direction Z, and a relatively flat top surface for stable contact with the second battery cell 42.

[0121] It is understood that the width and sidewall inclination angle of the protrusion 324 can be set based on the spacing between the second pressure relief mechanism 421 and the electrode terminal 44, the size of the connector at the electrode terminal 44, etc. For example, both electrode terminals 44 can be provided with a busbar or other component for achieving electrical connection. If the spacing between the electrical connection components at the two electrode terminals 44 is smaller than the length of the second pressure relief mechanism 421, the cross-section of the protrusion 324 can be set to a trapezoidal shape, with the longer horizontal side of the trapezoid located on the side closer to the second battery cell 42, so as to avoid the connector while stably contacting the second battery cell 42.

[0122] In some optional embodiments, multiple battery cells 40 are arranged along the first direction X or the second direction Y, and the first direction X intersects the second direction Y; 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 the first channel 311 and the second channel 321 both extend along the second direction Y.

[0123] Optionally, the housing 10 in the battery device 100 can be rectangular, polygonal, or other shapes with relatively regular outer edges to facilitate installation in an electrical device. In embodiments where multiple battery cells 40 are arranged along a first direction X and / or a second direction Y, the housing 10 can have different extension dimensions in the intersecting first direction X and second direction Y. The first direction X and second direction Y can further be arranged perpendicular to each other. In embodiments where multiple battery cells 40 are arranged in an array, the first direction X and second direction Y can be the row direction and column direction, respectively, of the arrangement of the battery cells 40.

[0124] 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 311 and the second channels 321 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 device 100, thereby further improving the heat dissipation performance and reliability of the battery device 100.

[0125] 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 along 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 composed of the first battery cell 41 and a second battery module composed of the second battery cell 42, the first battery module and the second battery module are arranged along the second direction Y, and the first direction X intersects with the second direction Y.

[0126] The battery device 100 includes multiple battery cells 40, which 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, the 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.

[0127] 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 a first direction X, while the first battery module and the second battery module are arranged along a second direction Y. The arrangement can optionally be alternating.

[0128] In the above two embodiments, the setting positions and extension trajectories of the first channel 311 and the second channel 321 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.

[0129] For example, in an embodiment where each battery module 43 includes a first battery cell 41 and a second battery cell 42, a first sub-component 31 and a second sub-component 32 may be provided on opposite sides of each battery module 43, and the orthographic projections of the first sub-component 31, the second sub-component 32, and each battery module 43 may overlap with each other, and the orthographic projections of each battery module 43 may be located within the orthographic projection contour range of the two components.

[0130] In an embodiment where two battery cells 40 respectively constitute a first battery module and a second battery module, the first sub-component 31 and the second sub-component 32 can be respectively arranged corresponding to the first battery module and the second battery module, that is, according to the number of the two battery modules 43, a plurality of first sub-components 31 and second sub-components 32 arranged at intervals along the arrangement direction of the battery modules 43 are arranged in the box body 10, and in the thickness direction Z, the orthographic projection of each first battery module is located within the orthographic projection outline range of the corresponding first sub-component 31, and the orthographic projection of each second battery module is located within the orthographic projection outline range of the corresponding second sub-component 32.

[0131] The multiple battery cells 40 in the battery device 100 can be arranged in different ways based on parameters such as heat generation and shape to improve the applicability of the air guide 30 and the overall performance of the battery device 100. Furthermore, the battery cells 40 in the housing 10 can be arranged in different ways to form one or more battery modules 43, making the arrangement of the multiple battery cells 40 more flexible and adaptable to different parameter requirements.

[0132] 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 311 and the second channel 321 , and both ends of the first channel 311 and the second channel 321 are respectively connected to multiple pressure relief valves 20 .

[0133] 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 311 and the second channel 321 .

[0134] Specifically, the housing 10 has two opposing side walls extending in the direction of the first channel 311 and the second channel 321. Multiple pressure relief valves 20 may be provided on each of these side walls, so that both ends of each first channel 311 and second channel 321 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.

[0135] 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.

[0136] It is understood that the 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 to this. 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 it can be located at the end of the first channel 311 or the second channel 321 and disposed on the bottom wall and / or 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 through the pressure relief valve 20.

[0137] By connecting both ends of the two channels to the pressure relief valve 20 on the housing 10 , the efficiency of discharging fluid during thermal runaway and the reliability of the battery device 100 can be further improved.

[0138] In some optional embodiments, the box body 10 includes a top plate and a bottom plate that are arranged opposite to each other, the second sub-component 32 is arranged close to the top plate, and the first sub-component 31 is arranged close to the bottom plate.

[0139] In the battery device 100 , the first subassembly 31 and the second subassembly 32 may be disposed on opposite sides of the thickness square, and the first pressure relief mechanism 411 and the second pressure relief mechanism 421 are disposed toward the first subassembly 31 and the second subassembly 32 , respectively.

[0140] On this basis, the first subassembly 31 can be positioned near the bottom plate of the housing 10, with the first pressure relief mechanism 411 of the first battery cell 41, which has a higher energy density, positioned toward the bottom plate. Taking vehicle 1000 as an example, when the battery assembly 100 is used in electrical equipment, it is typically positioned within the chassis, i.e., beneath the seat. By positioning the first pressure relief mechanism 411, which has a higher eruption intensity and greater impact force from emissions during thermal runaway, toward the bottom plate, the possibility of injury to operators and other connected structures during operation can be reduced, further improving the reliability of the battery assembly 100.

[0141] In some optional embodiments, the battery device 100 further includes a first adhesive layer and a second adhesive layer, the first battery cell 41 is adhesively connected to the first sub-component 31 through the first adhesive layer, and the second battery cell 42 is adhesively connected to the second sub-component 32 through the second adhesive layer; in the thickness direction Z of the air guide 30, the orthographic projection of the first adhesive layer is staggered with the orthographic projection of the first pressure relief mechanism 411 and the orthographic projection of the first inlet 312, and the orthographic projection of the second adhesive layer is staggered with the orthographic projection of the second pressure relief mechanism 421 and the orthographic projection of the second inlet 322.

[0142] To ensure a stable and reliable connection between the battery cell 40 and the air guide 30, the two can optionally be connected by adhesive bonding. Specifically, the battery assembly 100 also includes a first adhesive layer and a second adhesive layer, which are respectively disposed between the battery cell 40 and the first sub-assembly 31 and between the battery cell 40 and the second sub-assembly 32, and are used to fix the relative positions of the three. When applying the two adhesive layers, the respective inlets and pressure relief mechanisms on their respective sides can be avoided, and the adhesive connection can be performed on the relatively flat surfaces of the battery cell 40 and the air guide 30.

[0143] Optionally, the adhesive layer can maintain a certain distance from each inlet and the pressure relief mechanism. Taking the first adhesive layer as an example, the first adhesive layer is at least arranged between the first battery cell 41 and the first sub-component 31. In an embodiment where the distance between the second battery cell 42 and the first sub-component 31 is smaller, the first battery cell 41 and the second battery cell 42 can be bonded to the first sub-component 31 on one side thereof close to the first sub-component 31 through the first adhesive layer. At the same time, along the thickness direction Z, the orthographic projection of the first adhesive layer can be staggered with the orthographic projection of the first pressure relief mechanism 411 and the first inlet 312, and the orthographic projection of the first adhesive layer can have a certain gap with the orthographic projections of the other two, so as to reduce the possibility that the first adhesive layer enters the first inlet 312 and affects the rate of pressure relief.

[0144] The second adhesive layer, the second inlet 322 and the second pressure relief mechanism 421 can be arranged in the same manner, which will not be described in detail in this application.

[0145] The battery cell 40 and the first and second sub-components 31 and 32 of the air guide 30 can be adhesively connected to ensure a stable connection. At the same time, by adjusting the position of the adhesive layer, the possibility of the adhesive material interfering with the flow efficiency of the exhaust is reduced, further improving the reliability of the battery device 100.

[0146] In some optional embodiments, the air guide 30 is adhesively connected, detachably connected, or integrally formed with the box body 10. The air guide 30 can be fixedly connected, detachably connected, or integrally formed with the box body 10 to improve adaptability and reduce processing requirements.

[0147] 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 two sub-components in the air guide 30 can be set as components independent of the box body 10 and connected to the inner side of the box wall of the box body 10. They can be fixedly connected by bonding, welding, etc. to ensure a stable connection; 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 311 and the second channel 321 can be directly set in the box wall of the box body 10, and can be optionally set in the top plate and bottom plate of the box body 10 respectively, 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.

[0148] Optionally, the first sub-assembly 31 and the second sub-assembly 32 of the air guide 30 can each be connected to the housing 10 in the same or different manners. For example, when the housing 10 includes a housing body and a top plate detachably connected thereto, the first sub-assembly 31 can be detachably connected to the bottom wall of the housing body, and the second sub-assembly 32 can be detachably connected to the top plate. In embodiments where the battery cell 40 is bonded to the two sub-assemblies, detachable connection of the sub-assemblies to the housing 10 facilitates removal of the battery cell 40 for operation.

[0149] In some optional embodiments, the first battery cell 41 includes a first positive electrode active material, which includes a lithium transition metal oxide or a modified compound thereof; the second battery cell 42 includes a second positive electrode active material, which includes a lithium-containing phosphate or a modified compound thereof.

[0150] The battery cells 40 in the embodiment of the present application include a first battery cell 41 with a larger volume energy density and a second battery cell 42 with a smaller volume energy density. The difference between the two battery cells 40 may be due to the use of different positive electrode active materials.

[0151] Specifically, the first positive electrode active material used in the first battery cell 41 may be selected to include lithium transition metal oxide or its modified compound, and may further be selected to be a ternary polymer lithium battery; the second positive electrode active material used in the second battery cell 42 may be selected to include lithium phosphate or its modified compound, and may further be selected to be a lithium iron phosphate battery.

[0152] Among them, the ternary polymer lithium battery has higher energy density, higher calorific value and gas production efficiency, and the lithium iron phosphate battery has higher stability and longer service life. During operation, the heat generated by the ternary polymer lithium battery can provide a certain heating effect on the lithium iron phosphate battery, making its internal materials more activated.

[0153] The first battery cell 41 and the second battery cell 42 in the multiple battery cells 40 can use different positive electrode materials, thereby having different volume energy densities. By arranging different types of battery cells 40 in the same battery device 100, the advantages can be complementary to each other, thereby improving the overall performance of the battery device 100.

[0154] 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.

[0155] 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.

[0156] 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 the wall of the housing 10; the air guide 30 is disposed on the housing 10, and the air guide 30 includes a first sub-component 31 provided with a first channel 311 and a second sub-component 32 provided with a second channel 321. The first channel 311 and the second channel 321 are both connected to the pressure relief valve 20. The first sub-component 31 and the second sub-component 32 are respectively disposed on opposite sides of the housing 10; the plurality of battery cells 40 are accommodated in the housing 10 and are at least partially located between the first sub-component 31 and the second sub-component 32. It includes 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 first sub-component 31, and a second pressure relief mechanism 421 is provided on the side of the second battery cell 42 facing the second sub-component 32; wherein, the first sub-component 31 is provided with a first inlet 312 connected to the first channel 311, and the second sub-component 32 is provided with a second inlet 322 connected to the second channel 321, and the first inlet 312 and the second inlet 322 are respectively provided corresponding to the first pressure relief mechanism 411 and the second pressure relief mechanism 421.

[0157] The first pressure relief mechanism 411 is provided in a one-to-one correspondence with the first inlet 312, and the second pressure relief mechanism 421 is provided in a one-to-one correspondence with the second inlet 322. 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 312, and the orthographic projection of the second pressure relief mechanism 421 is located within the orthographic projection of the second inlet 322. The second sub-component 32 includes a main body 323 and a protrusion 324. The protrusion 324 protrudes from the main body 323 toward the second battery cell 42, and the second inlet 322 is provided on the protrusion 324. The battery cell 40 includes an electrode terminal 44 and a casing. The electrode terminal 44 of the second battery cell 42 protrudes from the casing. In the thickness direction Z of the air guide 30, the protrusion 324 protrudes from the main body 323 to a greater extent than the electrode terminal 44 of the second battery cell 42 protrudes from the casing.

[0158] 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 component disposed in the box body, the air guide component including a first sub-component provided with a first channel and a second sub-component provided with a second channel, the first channel and the second channel are both connected to the pressure relief valve, and the first sub-component and the second sub-component are respectively disposed on opposite sides of the box body; a plurality of battery cells housed in the housing and at least partially located between the first subassembly and the second subassembly, the plurality of battery cells comprising a first battery cell and a second battery cell, the first battery cell having a higher volume energy density than the second battery cell, a first pressure relief mechanism being provided on a side of the first battery cell facing the first subassembly, and a second pressure relief mechanism being provided on a side of the second battery cell facing the second subassembly; The first sub-component is provided with a first inlet connected to the first channel, and the second sub-component is provided with a second inlet connected to the second channel. 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 4, characterized in that The battery cells have electrode terminals. The electrode terminals of the first battery cell and the first pressure relief mechanism are disposed on two opposite sides, and the electrode terminals of the second battery cell and the second pressure relief mechanism are disposed on the same side.

6. The battery device according to claim 4, characterized in that The second sub-assembly includes a main body and a protruding portion, wherein the protruding portion protrudes from the main body toward the second battery cell, and the second inlet is provided at the protruding portion; The battery cell includes an electrode terminal and a shell, the electrode terminal of the second battery cell is protruding from the shell, and in the thickness direction of the air guide, the size of the protrusion protruding from the main body is larger than the size of the electrode terminal of the second battery cell protruding from the shell.

7. The battery device according to claim 6, characterized in that A side surface of the protrusion facing away from the main body abuts against the outer shell of the second battery cell.

8. The battery device according to claim 6, characterized in that In a cross section perpendicular to the extending direction of the second sub-component, the cross section formed by the protrusion is trapezoidal or rectangular.

9. The battery device according to claim 1, wherein: The plurality of battery cells are arranged along a first direction or a second direction, and the first direction intersects with the second direction; 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, and both the first channel and the second channel extend along the second direction.

10. 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 along 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.

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

12. The battery device according to claim 1, wherein: The box body includes a top plate and a bottom plate that are arranged opposite to each other. The second sub-component is arranged close to the top plate, and the first sub-component is arranged close to the bottom plate.

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

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

15. The battery device according to claim 1, wherein: The first battery cell includes a first positive electrode active material, and the first positive electrode active material includes a lithium transition metal oxide or a modified compound thereof; The second battery cell includes a second positive electrode active material, and the second positive electrode active material includes a lithium-containing phosphate or a modified compound thereof.

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.

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