Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a box assembly and a battery cell assembly. The box assembly comprises a box body, a protection structure and at least one reinforcing piece. The box body has a first accommodating cavity in the interior, at least one pressure relief area is arranged on a first cavity wall of the first accommodating cavity, and the battery cell assembly is arranged in the first accommodating cavity. The protection structure is arranged on a side of the box body away from the first accommodating cavity along a first direction, a second accommodating cavity is formed between the protection structure and the box body, and the first accommodating cavity is communicated with the second accommodating cavity through the pressure relief area. The reinforcing piece is arranged on the protection structure, and on a projection plane perpendicular to the first direction, a projection of the pressure relief area and a projection of the reinforcing piece have an overlapping area. The battery device provided by the application is beneficial to reducing the influence of high-temperature fluid on the protection structure, thereby improving the heat protection effect.

Description

Technical Field

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

[0002] In electrical devices equipped with battery units, the battery unit can provide all or part of the power. During the use of the battery unit, the individual battery cells within it generate heat. If this heat is too high, it will adversely affect the performance and lifespan of the battery unit. Thermal runaway in the battery unit may generate high-temperature fluids, and related technologies suffer from insufficient thermal protection in battery units. Utility Model Content

[0003] In view of this, the embodiments of this application aim to provide a battery device and an electrical device that can improve the thermal protection effect to a certain extent.

[0004] Therefore, a first aspect of the present disclosure provides a battery device, the battery device including a housing assembly and a battery cell assembly, the housing assembly including:

[0005] The box body has a first receiving cavity inside, and at least one pressure relief area is provided on the first cavity wall of the first receiving cavity. The battery cell assembly is disposed in the first receiving cavity.

[0006] A protective structure is provided on the side of the box body away from the first receiving cavity along a first direction, and a second receiving cavity is formed between the protective structure and the box body. The first receiving cavity is connected to the second receiving cavity through the pressure relief area.

[0007] At least one reinforcing member is disposed on the protective structure, and on a projection plane perpendicular to the first direction, the projection of the pressure relief area overlaps with the projection of the reinforcing member.

[0008] The battery device provided in this disclosure includes a housing assembly and a battery cell assembly. The housing assembly has a first receiving cavity, and the battery cell assembly is disposed within the first receiving cavity. The housing assembly protects the battery cell assembly. By providing at least one pressure relief area on the first cavity wall, the first receiving cavity is connected to a second receiving cavity via the pressure relief area. This means that high-temperature fluid generated during thermal runaway of the battery device can flow into the second receiving cavity through the pressure relief area. Thus, the first receiving cavity can be used to house the battery cell assembly and other high- and low-pressure components, thereby separating the high-temperature fluid in the second receiving cavity from the components in the first receiving cavity and reducing the impact of the high-temperature fluid on adjacent battery cells. Furthermore, by providing a reinforcing member on the protective structure, in the event of thermal runaway of a battery cell, the high-temperature fluid in the first receiving cavity can flow from the pressure relief area into the second receiving cavity and impact the reinforcing member, which helps to reduce the impact of the high-temperature fluid on the protective structure, thereby improving the thermal protection effect.

[0009] In some embodiments, there are multiple reinforcing members, which extend along a second direction and are spaced apart along a third direction, wherein the first direction, the second direction, and the third direction intersect.

[0010] Here, by using multiple reinforcing members, the reinforcing members can be positioned as close as possible to the pressure relief area, thereby improving the thermal protection effect. Furthermore, placing the reinforcing members only at the corresponding pressure relief areas reduces the number of reinforcing members used, thus lowering manufacturing costs and the weight of the battery device, ultimately increasing the energy density of the battery device.

[0011] In some embodiments, the reinforcement has a dimension of 10mm-120mm along the third direction.

[0012] The appropriate reinforcement within this size range minimizes space and weight while ensuring that, in the event of thermal runaway of a battery cell, the high-temperature fluid impacts the reinforcement as much as possible.

[0013] In some embodiments, the projection of the battery cell assembly is located within the projection range of the reinforcement on a projection plane perpendicular to the first direction.

[0014] In this way, the high-temperature fluid generated when a battery cell runs away can impact the reinforcing component as much as possible.

[0015] In some embodiments, the pressure relief area is formed with a pressure relief port, and the pressure relief port is provided for the battery cells of the battery cell assembly;

[0016] The housing assembly includes a seal that is sealed to the pressure relief port. The pressure-bearing capacity of the seal is less than the pressure-bearing capacity of the cavity wall of the first receiving cavity, excluding the pressure relief area.

[0017] In this embodiment, by forming a pressure relief port in the pressure relief area, the high-temperature fluid flowing out of the pressure relief mechanism from the thermal runaway of the battery cell can be discharged through the pressure relief port. In addition, by setting a sealing element, the pressure relief port can be blocked, which can protect the pressure relief mechanism before the thermal runaway of the battery cell.

[0018] In some embodiments, the seal corresponds one-to-one with the pressure relief port.

[0019] In this embodiment, by matching the seal with the pressure relief port one by one, it is further beneficial to protect the pressure relief mechanism of the battery cell and further reduce the impact of the high-temperature fluid generated by the thermal runaway of the battery cell on adjacent battery cells.

[0020] In some embodiments, at least a portion of the seal corresponds to at least two of the pressure relief ports.

[0021] In this embodiment, by covering at least two pressure relief ports with one seal, the number of seals can be reduced, thereby reducing costs and improving assembly efficiency.

[0022] In some embodiments, there are multiple pressure relief regions, each pressure relief region includes multiple pressure relief ports, and each pressure relief port of each pressure relief region is linearly arranged along the second direction. Each pressure relief region is arranged along a third direction, and the second direction and the third direction intersect. Each pressure relief region corresponds to a reinforcing member.

[0023] In this embodiment, by assigning a reinforcing member to each pressure relief port in each pressure relief area, it is beneficial to further reduce the number of reinforcing members, thereby further reducing costs and improving assembly efficiency.

[0024] In some embodiments, at least a portion of the seal corresponding to the pressure relief port is recessed in a direction away from the battery cell to form a recessed platform, at least a portion of which is located within the pressure relief port.

[0025] In this embodiment, by forming a recessed platform on the seal and placing at least a portion of the recessed platform inside the pressure relief port, the recessed platform can be used to avoid and protect the pressure relief mechanism of the battery cell, and can facilitate the installation of the pressure relief mechanism.

[0026] In some embodiments, the wall thickness of the pressure relief region is less than the wall thickness of the first cavity wall of the first receiving cavity other than the pressure relief region.

[0027] In this way, the pressure-bearing capacity of the pressure relief area is less than that of other areas of the first cavity wall of the first receiving cavity, except for the pressure relief area. In the event of thermal runaway of a single battery cell, the fluid in the first receiving cavity can flow out from the pressure relief area.

[0028] In some embodiments, the reinforcement has a protective coating on at least the side facing the pressure relief area.

[0029] In this embodiment, by providing a protective coating on at least one side of the reinforcing member facing the pressure relief area, it is beneficial to improve the high temperature resistance of the reinforcing member, thereby further improving the thermal protection effect of the reinforcing member.

[0030] In some embodiments, the protective coating is made of resin, inorganic ceramics, and film-forming agents.

[0031] This helps to improve the adhesion between the protective coating and the reinforcement, making the connection between the two more secure; it also helps to improve the high temperature resistance and impact resistance of the protective coating; and it helps to ensure that the protective coating can cover the reinforcement more evenly during the application process.

[0032] In some embodiments, the thickness of the protective coating ranges from 0.5 mm to 3 mm.

[0033] This helps to improve the structural strength of the protective coating itself and enhance its protective effect on the reinforcing components.

[0034] In some embodiments, the material of the protective coating includes a foaming agent configured to foam and expand upon reaching a set temperature.

[0035] In this way, on the one hand, the protective coating can better buffer the impact of emissions, and on the other hand, the gas in the pores generated after foaming has good thermal insulation properties, further slowing down the rate of heat transfer.

[0036] In some embodiments, the foaming agent includes at least one of sodium bicarbonate and potassium bicarbonate.

[0037] This allows the foaming temperature of the foaming agent to be compatible with the temperature of the emissions, so that the foaming agent can generate gas in a timely manner; the foaming agent can generate carbon dioxide, so as to better suppress combustion.

[0038] In some embodiments, the foaming temperature range of the foaming agent is 160°C to 300°C.

[0039] This allows the foaming temperature of the foaming agent to be adapted to the temperature of the emissions, so that the foaming agent can generate gas in a timely manner; and reduces the foaming of the foaming agent under the heating of the heat released during the normal operation of the battery device.

[0040] In some embodiments, the expansion ratio of the foaming agent is 4 to 10 times.

[0041] This allows the expanded protective coating to have better heat insulation and cushioning effects.

[0042] In some embodiments, the minimum gap between the reinforcing member and the housing body is 3mm-18mm.

[0043] The appropriate gap within this size range allows the high-temperature fluid to impact the reinforcement as much as possible during thermal runaway of a single battery cell, and helps to reduce high-speed fluid rebound, thereby reducing turbulence and improving exhaust efficiency.

[0044] In some embodiments, the reinforcing member has a melting point greater than or equal to 1300°C.

[0045] In this embodiment, by ensuring that the melting point of the reinforcing member is greater than or equal to 1300°C, the battery device can have a better thermal protection effect.

[0046] In some embodiments, the reinforcing member is made of at least one of titanium, steel, ceramic, phenolic resin, graphene, nickel-based alloy, or cobalt-based alloy.

[0047] Here, titanium plates, steel plates, ceramic plates, phenolic plates, graphene plates, nickel-based alloy plates, or cobalt-based alloy plates all have good high-temperature resistance.

[0048] In some embodiments, the reinforcing member comprises a titanium plate with a thickness of 0.2 mm to 1 mm.

[0049] The appropriate thickness within this size range allows the titanium plate to have good high-temperature resistance while minimizing its footprint and weight.

[0050] In some embodiments, the housing assembly includes an adhesive layer, through which the reinforcement is bonded to the protective structure.

[0051] In this embodiment, an adhesive layer is provided to achieve the connection between the reinforcing member and the protective structure. This connection structure is simple, has high assembly efficiency, and can improve the assembly reliability between the reinforcing member and the protective structure, thereby further improving the thermal protection performance of the battery device.

[0052] In some embodiments, at least a portion of the cavity wall of the second receiving cavity is formed with a protrusion.

[0053] Here, at least a portion of the cavity wall of the second receiving cavity is formed with a protrusion to form a flow channel inside the second receiving cavity. This helps to reduce the flow cross-section of the flow channel in the second receiving cavity and increase the fluid velocity, thereby improving cooling efficiency and exhaust efficiency. This allows the high-temperature fluid generated by the thermal runaway of the battery cell to be discharged in a timely manner, which helps to reduce the impact on other battery cells and thus reduce the chain reaction of thermal runaway of the battery cell.

[0054] In some embodiments, at least a portion of the sidewall of the protective structure facing away from the second receiving cavity is recessed, so that the protective structure protrudes from the sidewall facing the second receiving cavity to form the protrusion; or, at least a portion of the sidewall of the protective structure facing the second receiving cavity is thickened to form the protrusion.

[0055] In some embodiments, the housing assembly includes a filler disposed within the second receiving cavity, and an outlet channel is defined between the filler, the housing body, and the protective structure.

[0056] In this way, the flow channel can be formed without the need for protrusions or other structures on the box body, which helps to simplify the structure of the box body and reduce the manufacturing difficulty of the box body.

[0057] In some embodiments, the filler is made of at least one of foam, plastic, or styrofoam.

[0058] Here, the foam, plastic, or styrofoam components have a low density, which helps to reduce the weight of the housing components and thus increase the energy density of the battery device.

[0059] In some embodiments, the protective structure includes multiple layers of composite material, each of which comprises fibers and a resin matrix.

[0060] In this embodiment, by setting the protective structure to include a composite material layer, the composite material layer is lightweight and has high strength. This helps to reduce the weight of the protective structure and improve its structural strength, thereby helping to improve the energy density and structural strength of the battery device.

[0061] In some embodiments, the multi-layered composite material layers are laminated to form a composite plate, and the composite plate is molded to form at least a portion of the protective structure.

[0062] In this embodiment, a composite plate is formed by combining multiple layers of composite material, and then the composite plate is molded to form a protective structure. This molding process is simple and helps to improve manufacturing efficiency.

[0063] In some embodiments, the composite material layer comprises several layers of fiber prepreg.

[0064] In this embodiment, a composite material layer can be formed by directly laying several layers of fiber prepreg. This molding process is simple and helps to improve manufacturing efficiency.

[0065] A second aspect of this disclosure provides an electrical device, including the battery device or the energy storage device described above.

[0066] In some embodiments, the electrical device includes an aircraft. Attached Figure Description

[0067] Figure 1 This is a schematic diagram of the vehicle structure provided in some embodiments of this disclosure;

[0068] Figure 2 A partial exploded perspective view of a battery device provided in some embodiments of this disclosure;

[0069] Figure 3 This is a partial structural schematic diagram of a battery device provided in some embodiments of the present disclosure;

[0070] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0071] Figure 5 A partial exploded perspective view of a battery device provided in some embodiments of this disclosure;

[0072] Figure 6 This is a partial structural schematic diagram of a battery device provided in some embodiments of this disclosure.

[0073] Explanation of reference numerals in the attached figures

[0074] 10. Battery cell assembly; 11. Battery cell; 20. Housing assembly; 21. Housing body; 211. First housing section; 22. Protective structure; 23. First receiving cavity; 231. First cavity wall; 24. Second receiving cavity; 241. Inlet; 242. Outlet; 25. Pressure relief area; 26. Reinforcing member; 27. Sealing member; 271. Platform; 28. Protrusion; 29. ​​Filler; 30. Flow channel; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0075] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0076] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0077] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0078] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0079] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0080] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0081] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0082] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0083] In some implementations, the electrode assembly is a stacked structure.

[0084] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0085] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0086] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0087] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0088] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0089] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0090] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0091] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0092] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This disclosure does not impose any particular limitations.

[0093] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0094] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0095] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0096] In related technologies, during the thermal runaway of a battery device, the battery device has insufficient thermal protection. For example, the explosion-proof valve is located at the bottom of the battery cell. After the battery cell undergoes thermal runaway, the high-temperature fluid generated may penetrate the casing and bottom protective plate. This is especially true for the thermal runaway of high-energy-density battery devices, which requires further improvement in the thermal protection of the battery device.

[0097] In view of this, to reduce the thermal protection effect of the battery device, this disclosure provides a battery device including a housing assembly and a battery cell assembly. The housing assembly includes a housing body, a protective structure, and at least one reinforcing member. The housing body has a first receiving cavity inside, and at least one pressure relief area is provided on the first cavity wall of the first receiving cavity. The battery cell assembly is disposed within the first receiving cavity. The protective structure is disposed on the side of the housing body opposite to the first receiving cavity along a first direction, and a second receiving cavity is formed between the protective structure and the housing body. The first receiving cavity communicates with the second receiving cavity through the pressure relief area. The reinforcing member is disposed on the protective structure, and on a projection plane perpendicular to the first direction, the projection of the pressure relief area and the projection of the reinforcing member have an overlapping area.

[0098] The battery device provided in this disclosure includes a housing assembly and a battery cell assembly. The housing assembly has a first receiving cavity, and the battery cell assembly is disposed within the first receiving cavity. The housing assembly protects the battery cell assembly. By providing at least one pressure relief area on the first cavity wall, the first receiving cavity is connected to a second receiving cavity via the pressure relief area. This means that high-temperature fluid generated during thermal runaway of the battery device can flow into the second receiving cavity through the pressure relief area. Thus, the first receiving cavity can be used to house the battery cell assembly and other high- and low-pressure components, thereby separating the high-temperature fluid in the second receiving cavity from the components in the first receiving cavity and reducing the impact of the high-temperature fluid on adjacent battery cells. Furthermore, by providing a reinforcing member on the protective structure, in the event of thermal runaway of a battery cell, the high-temperature fluid in the first receiving cavity can flow from the pressure relief area into the second receiving cavity and impact the reinforcing member, which helps to reduce the impact of the high-temperature fluid on the protective structure, thereby improving the thermal protection effect.

[0099] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical devices include battery devices according to any embodiment of this disclosure, and the battery devices are used to provide electrical energy.

[0100] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power 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, etc. This disclosure does not impose any special limitations on the above-mentioned electrical equipment.

[0101] It should be noted that the technical solutions described in this disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices.

[0102] Please refer to Figure 1 The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0103] For example, the electrical device includes an aircraft.

[0104] Aircraft generally refer to machines that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0105] Please see Figure 2To meet different power demands, the battery device 100 includes a battery cell assembly 10, which may include multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a module or package of the battery device 100. Multiple battery cells 11 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 11 are connected in both series and parallel connections. Multiple battery cells 11 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 11 is housed within a housing assembly 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 11 first connected in series, parallel, or in a mixed configuration to form a battery device 100 module, and then these modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing assembly 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 11. Each battery cell 11 can be a secondary battery device 100 or a primary battery device 100; it can also be a lithium-sulfur battery device 100, a sodium-ion battery device 100, or a magnesium-ion battery device 100, but is not limited to these. The battery cell 11 can be cylindrical, flat, cuboid, or other shapes.

[0106] Please see Figures 2 to 6 This disclosure provides a battery device 100, which includes a housing assembly 20 and a battery cell assembly 10. The housing assembly 20 includes a housing body 21, a protective structure 22, and at least one reinforcing member 26. The housing body 21 has a first receiving cavity 23 inside, and at least one pressure relief region 25 is provided on the first cavity wall 231 of the first receiving cavity 23. The battery cell assembly 10 is disposed in the first receiving cavity 23. The protective structure 22 is disposed on the side of the housing body 21 opposite to the first receiving cavity 23 along a first direction, and a second receiving cavity 24 is formed between the protective structure 22 and the housing body 21. The first receiving cavity 23 communicates with the second receiving cavity 24 through the pressure relief region 25. The reinforcing member 26 is disposed on the protective structure 22, and on a projection plane perpendicular to the first direction, the projection of the pressure relief region 25 and the projection of the reinforcing member 26 have an overlapping area.

[0107] Please refer to Figure 2 and Figure 5 The battery device 100 includes a housing assembly 20 and a battery cell assembly 10, with the battery cell assembly 10 disposed within the first receiving cavity 23 of the housing assembly 20.

[0108] The box assembly 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0109] The housing assembly 20 is used to encapsulate the battery cell 11, and the housing assembly 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11.

[0110] For example, the enclosure assembly 20 is typically a cuboid structure, with both its length and width directions parallel to the horizontal plane. The length direction of the enclosure assembly 20 is parallel to the longest side of its cuboid structure. The height direction of the enclosure assembly 20 is perpendicular to the ground. For example, as... Figure 2 As shown, the height direction of the housing assembly 20 is the first direction, the width direction of the housing assembly 20 is the second direction, and the length direction of the housing assembly 20 is the third direction; or the height direction of the housing assembly 20 is the first direction, the length direction of the housing is the second direction, and the width direction of the housing assembly 20 is the third direction.

[0111] In some embodiments, please refer to Figure 2 and Figure 5 The housing assembly 20 includes a housing body 21, which includes a first housing portion 211 and a second housing portion. The first housing portion 211 and the second housing portion enclose and form a first receiving cavity 23.

[0112] Here, the pressure relief area 25 can be opened after braking, or the pressure relief area 25 can be a through hole that directly connects to the second receiving cavity 24.

[0113] As an example, the second receiving cavity 24 is connected to the outside of the battery device 100. High-temperature fluid generated during thermal runaway of the battery device 100 can flow into the second receiving cavity 24 through the pressure relief area 25, and then be discharged to the outside of the battery device 100 through the second receiving cavity 24. This achieves separation of the high-temperature fluid from the components inside the first receiving cavity 23, which can reduce the risk of damage to other normally functioning battery cells 11 caused by the high-temperature fluid. Furthermore, the second receiving cavity 24 can also separate the high-temperature fluid from high-voltage components, which is beneficial in reducing damage to the high-voltage components of the battery device 100, thereby mitigating insulation failure and even short-circuit arcing.

[0114] The fact that at least one pressure relief area 25 is provided on the first cavity wall 231 means that the number of pressure relief areas 25 provided on the first cavity wall 231 is one or more.

[0115] In this disclosure, "multiple" refers to two or more items.

[0116] For example, the protective structure 22 may be a bottom protective plate.

[0117] On the projection plane perpendicular to the first direction, the projection of the pressure relief region 25 and the projection of the reinforcing member 26 have an overlapping area, so that the high-temperature fluid flowing from the pressure relief region 25 into the second receiving cavity 24 can impact the reinforcing member 26.

[0118] For example, on a projection plane perpendicular to the first direction, the projection of the pressure relief region 25 is located within the projection range of the reinforcement 26, so that the high-temperature fluid can impact the reinforcement 26 as much as possible.

[0119] The battery device 100 provided in this embodiment includes a housing assembly 20 and a battery cell assembly 10. The housing body 21 of the housing assembly 20 has a first receiving cavity 23, and the battery cell assembly 10 is disposed in the first receiving cavity 23. The housing assembly 20 protects the battery cell assembly 10. By providing at least one pressure relief area 25 on the first cavity wall 231 of the first receiving cavity 23, the first receiving cavity 23 is connected to a second receiving cavity 24 through the pressure relief area 25. That is, the high-temperature fluid generated by thermal runaway of the battery device 100 can flow into the second receiving cavity 24 through the pressure relief area 25. In this way, the first receiving cavity 23 can be used to arrange the battery cell assembly 10 and other high and low pressure components, thereby achieving the separation of the high-temperature fluid in the second receiving cavity 24 from the components in the first receiving cavity 23 and reducing the impact of the high-temperature fluid on adjacent battery cells 11. Furthermore, by providing a reinforcing member 26 on the protective structure 22, in the event of thermal runaway of the battery cell 11, the high-temperature fluid in the first receiving cavity 23 can flow from the pressure relief area 25 into the second receiving cavity 24 and impact the reinforcing member 26, which helps to reduce the impact of the high-temperature fluid on the protective structure 22 and thus improves the thermal protection effect.

[0120] In some embodiments, please refer to Figure 2 and Figure 5 There are multiple reinforcing members 26, which extend along the second direction and are spaced apart along the third direction. The first direction, the second direction and the third direction intersect.

[0121] Here, by setting multiple reinforcing members 26, the reinforcing members 26 can be positioned on the pressure relief area 25 as much as possible, thereby improving the thermal protection effect. In addition, setting the reinforcing members 26 only at the positions corresponding to the pressure relief area 25 helps to reduce the use of reinforcing members 26, thereby reducing manufacturing costs and the weight of the battery device 100, and thus increasing the energy density of the battery device 100.

[0122] In some embodiments, please refer to Figure 2 and Figure 5 The dimensions of the reinforcing member 26 along the third direction are 10mm-120mm.

[0123] The dimension of the reinforcing member 26 along a third direction can be any one of 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm or any combination thereof.

[0124] In this embodiment, by setting the size of the reinforcing member 26 along the third direction to 10mm-120mm, the reinforcing member 26 within this size range is appropriate. While minimizing the space occupied and weight, it is possible to ensure that the high-temperature fluid impacts the reinforcing member 26 as much as possible in the event of thermal runaway of the battery cell 11.

[0125] In some embodiments, please continue reading Figure 2 and Figure 5 On the projection plane perpendicular to the first direction, the projection of the battery cell assembly 10 is located within the projection range of the reinforcing member 26.

[0126] In this way, the high-temperature fluid generated when the battery cell 11 runs away can impact the reinforcing member 26 as much as possible.

[0127] In some embodiments, please refer to Figure 2 The pressure relief area 25 has a pressure relief port, which is provided for the battery cell 11 of the battery cell assembly 10. The housing assembly 20 includes a seal 27, which is sealed at the pressure relief port. The pressure bearing capacity of the seal 27 is less than the pressure bearing capacity of the first cavity wall 231 of the first receiving cavity 23, excluding the pressure relief area 25.

[0128] For example, the pressure relief port is provided corresponding to the pressure relief mechanism of the battery cell 11, which allows the high-temperature fluid flowing out of the pressure relief mechanism from the battery cell 11 during thermal runaway to be discharged through the pressure relief port.

[0129] For example, the projection of the pressure relief mechanism is located within the projection range of the pressure relief port on the first cavity wall 231.

[0130] For example, the pressure relief mechanism is positioned directly opposite the pressure relief port.

[0131] For example, the pressure relief mechanism can be an explosion-proof valve.

[0132] The sealing element 27 is installed at the pressure relief port, that is, the sealing element 27 covers the pressure relief port and acts as a shield to block the pressure relief port. Before the battery cell 11 thermally runs away, it can protect the pressure relief mechanism of the battery cell 11.

[0133] In this embodiment, by forming a pressure relief port in the pressure relief area 25, the high-temperature fluid flowing out of the pressure relief mechanism from the thermal runaway of the battery cell 11 can be discharged through the pressure relief port. In addition, by setting the sealing element 27, the pressure relief port is blocked, which can protect the pressure relief mechanism before the thermal runaway of the battery cell 11.

[0134] In some embodiments, please refer to Figure 2 and Figure 5 Each seal 27 corresponds to a pressure relief port.

[0135] In other words, a seal 27 is provided at a pressure relief port.

[0136] In this embodiment, by matching the seal 27 with the pressure relief port one by one, it is further beneficial to protect the pressure relief mechanism of the battery cell 11, and further reduce the impact of the high temperature fluid generated by the thermal runaway of the battery cell 11 on the adjacent battery cells 11.

[0137] In some embodiments, at least a portion of the seal 27 corresponds to at least two pressure relief ports.

[0138] In other words, some of the seals 27 may correspond to at least two pressure relief ports, or all of the seals 27 may correspond to at least two pressure relief ports.

[0139] In this embodiment, by covering at least two pressure relief ports with one seal 27, it is beneficial to reduce the number of seals 27, thereby reducing costs and improving assembly efficiency.

[0140] In some embodiments, please refer to Figure 2 and Figure 5 There are multiple pressure relief regions 25. Each pressure relief region 25 includes multiple pressure relief ports, and the pressure relief ports of each pressure relief region 25 are arranged linearly along the second direction. Each pressure relief region 25 is arranged along the third direction, and the second direction and the third direction intersect. Each pressure relief region 25 corresponds to one of the reinforcing members 26.

[0141] For example, the battery cell assembly 10 includes a plurality of battery packs, each battery pack including a plurality of battery cells 11, the plurality of battery cells 11 being arranged linearly along a second direction, one battery pack corresponding to one pressure relief region 25, and all pressure relief ports of each pressure relief region 25 corresponding to one reinforcement member 26, that is, the pressure relief region 25 and the reinforcement member 26 correspond one-to-one.

[0142] In this embodiment, by assigning a reinforcing member 26 to each pressure relief port of each pressure relief area 25, it is beneficial to further reduce the number of reinforcing members 26, thereby further reducing costs and improving assembly efficiency.

[0143] Of course, multiple battery packs can also correspond to one reinforcing component 26.

[0144] In some embodiments, please refer to Figures 2 to 4 At least a portion of the seal 27 corresponding to the pressure relief port area sinks away from the battery cell 11 to form a recessed platform 271, at least a portion of the recessed platform 271 being located within the pressure relief port.

[0145] "At least part of the sinking platform 271 is located inside the pressure relief port" means that either part of the sinking platform 271 is located inside the pressure relief port, or all of the sinking platform 271 is located inside the pressure relief port.

[0146] In this embodiment, by forming a recessed platform 271 in the sealing member 27 and placing at least a portion of the recessed platform 271 inside the pressure relief port, the recessed platform 271 can be used to avoid and protect the pressure relief mechanism of the battery cell 11, and can facilitate the installation of the pressure relief mechanism.

[0147] In some embodiments, the wall thickness of the pressure relief region 25 is less than the wall thickness of the first cavity wall 231 of the first receiving cavity 23 in other regions besides the pressure relief region 25.

[0148] In this way, the pressure-bearing capacity of the pressure relief area 25 is less than that of other areas of the first cavity wall 231 of the first receiving cavity 23, excluding the pressure relief area 25. In the event of thermal runaway of the battery cell 11, the fluid in the first receiving cavity 23 can flow out from the pressure relief area 25.

[0149] For example, the first cavity wall 231 may be the bottom wall of the first receiving cavity 23.

[0150] In some embodiments, the reinforcement 26 is provided with a protective coating on at least the side facing the pressure relief area 25.

[0151] For example, the protective coating is a high-temperature resistant protective coating.

[0152] Here, the reinforcing member 26 may have a protective coating on the side facing the pressure relief area 25, or the reinforcing member 26 may have a protective coating on both sides along the thickness direction.

[0153] In this embodiment, by providing a protective coating on at least one side of the reinforcing member 26 facing the pressure relief area 25, it is beneficial to improve the high temperature resistance of the reinforcing member 26, thereby further improving the thermal protection effect of the reinforcing member 26.

[0154] For example, the materials for the protective coating include resins, inorganic ceramics, and film-forming agents.

[0155] The resin is used to bond the added inorganic ceramic particles and facilitates the adhesion of the protective coating to the reinforcement 26; the inorganic ceramic has high structural strength and high temperature resistance; the film-forming agent is a polymer that enables the protective coating to form a continuous thin film.

[0156] This is beneficial for improving the adhesion between the protective coating and the reinforcing member 26, making the connection between the two more secure; it is beneficial for improving the high temperature resistance and impact resistance of the protective coating; and it is beneficial for the protective coating to cover the reinforcing member 26 more evenly during the application process.

[0157] The specific types of resins included in the protective coating materials can be polyurethane, polyamide, etc.

[0158] Inorganic ceramics can be silicide ceramics, carbide ceramics, boride ceramics, etc.

[0159] Silicide ceramics can be Ca2Si, Mg2Si, CaSi2, MoSi2, etc.

[0160] Carbide ceramics can be titanium carbide, zirconium carbide, tungsten carbide, silicon carbide, etc.

[0161] Boride ceramics can be zirconium diboride, titanium diboride, lanthanum hexaboride, etc.

[0162] The specific type of film-forming agent material for the protective coating can be polyvinyl alcohol film-forming agent.

[0163] In some embodiments, the thickness of the protective coating ranges from 0.5 mm to 3 mm.

[0164] This helps to improve the structural strength of the protective coating itself and enhance its protective effect on the reinforcing member 26.

[0165] The dimensions of the protective coating along the first direction can be 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm.

[0166] For example, the specific dimensions of the protective coating can be measured using vernier calipers.

[0167] In some embodiments, the material of the protective coating includes a foaming agent configured to foam and expand upon reaching a set temperature.

[0168] In other words, after the protective coating is burned by the emissions, the temperature of the foaming agent rises and reaches its foaming temperature. The gas produced by the foaming agent can form a large number of pores in the protective coating, causing the protective coating to expand.

[0169] It is understandable that the foaming temperature of a foaming agent is the set temperature at which the foaming agent can foam and expand, and at this temperature the foaming agent can produce gas.

[0170] In this way, on the one hand, the protective coating can better buffer the impact of emissions, and on the other hand, the gas in the pores generated after foaming has good thermal insulation properties, further slowing down the rate of heat transfer.

[0171] In some embodiments, the foaming agent includes carbonates.

[0172] In some embodiments, the foaming agent includes at least one of sodium bicarbonate and potassium bicarbonate.

[0173] This allows the foaming temperature of the foaming agent to be compatible with the temperature of the emissions, so that the foaming agent can generate gas in a timely manner; the foaming agent can generate carbon dioxide, so as to better suppress combustion.

[0174] In some embodiments, the foaming agent includes at least one of azodicarbonamide and sulfonyl hydrazine.

[0175] In some embodiments, the foaming temperature range of the foaming agent is 160°C to 300°C.

[0176] Thus, the foaming temperature of the foaming agent is first set below 300℃, so that the foaming temperature of the foaming agent is adapted to the temperature of the emission, or the foaming temperature of the foaming agent is lower than the temperature of the emission, so that the foaming agent can generate gas and complete foaming in time before the emission is discharged; thereby saving the foaming time of the foaming agent when the emission is discharged. Furthermore, the foaming temperature of the foaming agent is set above 160℃, so that the foaming temperature of the foaming agent is higher than the normal operating temperature of the battery device 100, thereby reducing the probability of the foaming agent being heated and foaming under normal operating conditions of the battery device 100.

[0177] The specific foaming temperatures of the foaming agent are 160℃, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, 230℃, 240℃, 250℃, 260℃, 270℃, 280℃, 290℃, 300℃, etc.

[0178] In some embodiments, the expansion ratio of the foaming agent is 4 to 10 times.

[0179] The expansion ratio refers to the ratio of the volume of the protective coating after the foaming agent has expanded to the volume before the foaming agent has expanded.

[0180] This allows the expanded protective coating to have better heat insulation and cushioning effects.

[0181] In some embodiments, please refer to Figures 2 to 4 The minimum gap between the reinforcing member 26 and the box body 21 is 3mm-18mm.

[0182] In other words, the minimum gap between the reinforcing member 26 and the box body 21 is greater than or equal to 3mm and less than or equal to 18mm.

[0183] The minimum gap between the reinforcing member 26 and the housing body 21 can be any one of 3mm, 4mm, 5mm, 10mm, 15mm, 16mm, 17mm, or 18mm, or any combination thereof.

[0184] In this embodiment, by setting the minimum gap between the reinforcing member 26 and the housing body 21 to 3mm-18mm, the appropriate gap within this size range can ensure that the high-temperature fluid impacts the reinforcing member 26 as much as possible when the battery cell 11 experiences thermal runaway, and can also help reduce the rebound of high-speed fluid, thereby helping to reduce turbulence and improve exhaust efficiency.

[0185] In some embodiments, please refer to Figures 2 to 4 The minimum gap between the reinforcing member 26 and the box body 21 is 5mm-15mm.

[0186] The minimum gap between the reinforcing member 26 and the housing body 21 can be any one of 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, or 15mm, or any combination thereof.

[0187] In this embodiment, by setting the minimum gap between the reinforcing member 26 and the housing body 21 to 5mm-15mm, the appropriate gap within this size range can ensure that the high-temperature fluid impacts the reinforcing member 26 as much as possible when the battery cell 11 experiences thermal runaway, and can further reduce the rebound of high-speed fluid, thereby further reducing turbulence and further improving exhaust efficiency.

[0188] In some embodiments, the melting point of the reinforcing member 26 is greater than or equal to 1300°C.

[0189] For example, the melting point of the reinforcing member 26 can be tested using an acetylene flame torch (temperature 1300-1600℃) and a gas torch (jet flow force 0.7MPa). The flame is burned for 15 seconds, accompanied by a jet of gas for 5 seconds. The flame is about 10cm away from the reinforcing member 26, and the gas flow is about 1.5cm away from the reinforcing member 26.

[0190] In this embodiment, by making the melting point of the reinforcing member 26 greater than or equal to 1300°C, the battery device 100 can have a better thermal protection effect.

[0191] It should be noted that there are no restrictions on the material of the reinforcing component 26.

[0192] In some embodiments, the material of the reinforcing member 26 includes at least one of titanium, steel, ceramic, phenolic resin, graphene, nickel-based alloy, or cobalt-based alloy.

[0193] In other words, the reinforcing member 26 can be made of titanium plate, steel plate, ceramic plate, phenolic plate, graphene plate, nickel-based alloy plate or cobalt-based alloy plate, etc.

[0194] Here, titanium plates, steel plates, ceramic plates, phenolic plates, graphene plates, nickel-based alloy plates, or cobalt-based alloy plates all have good high-temperature resistance.

[0195] In some embodiments, the reinforcing member 26 includes a titanium plate with a thickness of 0.2 mm to 1 mm.

[0196] The thickness of the reinforcing member 26 can be any one of 0.2mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, or any value between two of them.

[0197] In this embodiment, by setting the thickness of the titanium plate to 0.2mm-1mm, a thickness within this size range is appropriate, so as to minimize the space and weight occupied while giving the titanium plate good high-temperature resistance.

[0198] In some embodiments, the thickness of the titanium plate is 0.2 mm to 0.6 mm.

[0199] The thickness of the titanium plate can be any one of 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 0.6mm, or any value between two of them.

[0200] In this way, while further reducing the space occupied and weight, the titanium plate can have better high-temperature resistance.

[0201] In some embodiments, the housing assembly 20 includes an adhesive layer, and the reinforcement 26 is bonded to the protective structure 22 via the adhesive layer.

[0202] Here, the adhesive layer can be formed by bonding with structural adhesive and then solidifying.

[0203] In this embodiment, an adhesive layer is provided to achieve the connection between the reinforcing member 26 and the protective structure 22. This connection structure is simple, has high assembly efficiency, and can improve the assembly reliability between the reinforcing member 26 and the protective structure 22, thereby further improving the thermal protection performance of the battery device 100.

[0204] In other embodiments, the housing assembly 20 and the reinforcing member 26 may also be connected by snap-fit, welding, or fastening.

[0205] In some embodiments, please refer to Figures 2 to 4 At least a portion of the cavity wall of the second receiving cavity 24 has a protrusion 28.

[0206] Here, the first cavity wall 231 may have a protrusion 28, or the other cavity walls of the second receiving cavity 24 other than the first cavity wall 231 may have a protrusion 28.

[0207] Here, at least a portion of the cavity wall of the second receiving cavity 24 is formed with a protrusion 28, so that a flow channel 30 is formed inside the second receiving cavity 24. This helps to reduce the flow cross-section of the flow channel 30 in the second receiving cavity 24, increase the fluid flow rate, thereby improving the cooling efficiency and exhaust efficiency. This allows the high-temperature fluid generated by the thermal runaway of the battery cell 11 to be discharged in time, which helps to reduce the impact on other battery cells 11 and thus reduce the chain reaction of thermal runaway of the battery cell 11.

[0208] In some embodiments, please refer to Figure 2 and Figure 5 The housing assembly 20 also includes an inlet 241 and an outlet 242 that are both connected to the second receiving cavity 24. In this way, a wind-cooling circuit can be formed in the second receiving cavity 24. During use, the battery device 100 can cool the battery cells 11 in the first receiving cavity 23 through the wind-cooling circuit.

[0209] For example, the second receiving cavity 24 can be connected to the outside of the battery device 100 via an inlet 241 and an outlet 242.

[0210] For example, the second receiving cavity 24 may also be connected to the air-cooling system of the battery device 100 or the air-cooling system of the electrical device via the inlet 241 and the outlet 242.

[0211] It should be noted that there are multiple ways in which the protrusion 28 can be formed.

[0212] In some embodiments, please refer to Figure 2 At least a portion of the sidewall of the protective structure 22 facing away from the second receiving cavity 24 is recessed, so that the protective structure 22 protrudes to form a protrusion 28 on the sidewall facing the second receiving cavity 24.

[0213] In other embodiments, at least a portion of the sidewall of the protective structure 22 facing the second receiving cavity 24 is thickened to form a protrusion 28.

[0214] In some embodiments, please refer to Figures 5 to 6 The housing assembly 20 includes a filler 29 disposed within the second receiving cavity 24, and an outlet channel 30 is defined between the filler 29, the housing body 21, and the protective structure 22.

[0215] Here, by providing a filler 29 in the second receiving cavity 24, a flow channel 30 is defined between the filler 29, the box body 21, and the protective structure 22. This helps to reduce the flow cross-section of the flow channel 30 in the second receiving cavity 24, increase the fluid flow rate, and thus improve the cooling efficiency and exhaust efficiency.

[0216] In this way, the box body 21 does not need to be provided with protrusions 28 or other structures to form the flow channel 30, which helps to simplify the structure of the box body 21 and reduce the manufacturing difficulty of the box body 21.

[0217] In some embodiments, please refer to Figures 5 to 6 The material of filler 29 includes at least one of foam, plastic or styrofoam.

[0218] In other words, the filler 29 may include at least one of foam, plastic or fusible.

[0219] Here, the foam, plastic or styrofoam components have a low density, which helps to reduce the weight of the housing assembly 20 and thus increase the energy density of the battery device 100.

[0220] In some embodiments, the protective structure 22 includes multiple layers of composite material, each of which includes fibers and a resin matrix.

[0221] Here, each composite layer comprises fibers and a resin matrix. The resin matrix bonds the fibers together, forming a unified whole, thus ensuring the continuity and integrity of the composite layer. Fibers are used to improve the strength and stiffness of the composite material, enhancing its mechanical properties.

[0222] For example, the fibers include glass fibers, aramid fibers, or carbon fibers.

[0223] For example, the resin matrix includes at least one of epoxy resin, polyurethane resin, vinyl resin, polypropylene resin, and polyamide resin.

[0224] In this embodiment, by setting the protective structure 22 to include a composite material layer, the composite material layer is lightweight and has high strength. This helps to reduce the weight of the protective structure 22 and improve its structural strength, thereby helping to improve the energy density and structural strength of the battery device 100.

[0225] In some embodiments, multiple layers of composite material are laminated to form a composite plate, and the composite plate is molded to form at least a partial protective structure 22.

[0226] In this embodiment, a composite plate is formed by combining multiple layers of composite material, and then the composite plate is molded to form a protective structure 22. This molding process is simple and helps to improve manufacturing efficiency.

[0227] In some embodiments, the composite material layer includes several layers of fiber prepreg.

[0228] In this embodiment, a composite material layer can be formed by directly laying several layers of fiber prepreg. This molding process is simple and helps to improve manufacturing efficiency.

[0229] In the description of this disclosure, references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described in this disclosure and the features of the different embodiments or examples without contradiction.

[0230] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A battery device, characterized by, The battery device includes a housing assembly and a battery cell assembly, the housing assembly comprising: The box body has a first receiving cavity inside, and at least one pressure relief area is provided on the first cavity wall of the first receiving cavity. The battery cell assembly is disposed in the first receiving cavity. A protective structure is provided on the side of the box body away from the first receiving cavity along a first direction, and a second receiving cavity is formed between the protective structure and the box body. The first receiving cavity is connected to the second receiving cavity through the pressure relief area. At least one reinforcing member is disposed on the protective structure, and on a projection plane perpendicular to the first direction, the projection of the pressure relief area overlaps with the projection of the reinforcing member.

2. The battery device according to claim 1, characterized by The number of reinforcing members is multiple, the reinforcing members extend along the second direction, and the multiple reinforcing members are spaced apart along the third direction, the first direction, the second direction and the third direction intersect.

3. The battery device according to claim 1, characterized in that, On a projection plane perpendicular to the first direction, the projection of the battery cell assembly lies within the projection range of the reinforcing member.

4. The battery device according to claim 1, characterized in that, The pressure relief area is provided with a pressure relief port, and the pressure relief port is provided for each battery cell in the battery cell assembly. The housing assembly includes a seal that is sealed to the pressure relief port. The pressure-bearing capacity of the seal is less than the pressure-bearing capacity of the cavity wall of the first receiving cavity, excluding the pressure relief area.

5. The battery device according to claim 4, characterized in that, The seals correspond one-to-one with the pressure relief ports, or at least some of the seals correspond to at least two of the pressure relief ports.

6. The battery device according to claim 4, characterized in that, At least a portion of the seal, corresponding to the area of ​​the pressure relief port, is recessed away from the battery cell to form a recessed platform, at least a portion of which is located within the pressure relief port.

7. The battery device according to claim 1, characterized in that, The reinforcing member has a protective coating on at least one side facing the pressure relief area.

8. The battery device according to claim 7, characterized in that, The protective coating material includes resin, inorganic ceramics, and film-forming agents; and / or, The thickness of the protective coating ranges from 0.5 mm to 3 mm.

9. The battery device according to claim 7, characterized in that, The material of the protective coating includes a foaming agent configured to foam and expand at a set temperature.

10. The battery device according to claim 9, characterized in that, The foaming agent includes at least one of sodium bicarbonate and potassium bicarbonate; and / or, The foaming temperature range of the foaming agent is 160°C to 300°C; and / or, The expansion ratio of the foaming agent is 4 to 10 times.

11. The battery device according to any one of claims 1 to 10, characterized in that, The minimum gap between the reinforcing member and the box body is 3mm-18mm; and / or, The melting point of the reinforcing member is greater than or equal to 1300°C; and / or, The reinforcing member is made of at least one of titanium, steel, ceramic, phenolic resin, graphene, nickel-based alloy, or cobalt-based alloy.

12. The battery device according to any one of claims 1 to 10, characterized in that, The reinforcing member includes a titanium plate with a thickness of 0.2 mm to 1 mm.

13. The battery device according to any one of claims 1 to 10, characterized in that, The enclosure assembly includes an adhesive layer, and the reinforcing member is bonded to the protective structure via the adhesive layer; and / or At least a portion of the cavity wall of the second receiving cavity has protrusions.

14. The battery device according to claim 13, characterized in that, At least a portion of the sidewall of the protective structure facing away from the second receiving cavity is recessed, so that the protective structure protrudes from the sidewall facing the second receiving cavity to form the protrusion; or, at least a portion of the sidewall of the protective structure facing the second receiving cavity is thickened to form the protrusion.

15. The battery device according to any one of claims 1 to 10, characterized in that, The housing assembly includes a filler disposed within the second receiving cavity, and an outlet channel is defined between the filler, the housing body, and the protective structure; and / or The protective structure comprises multiple layers of composite material, each of which includes fibers and a resin matrix.

16. The battery device according to claim 15, characterized in that, The filler material includes at least one of foam, plastic, or styrofoam.

17. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 16.

18. The electrical appliance according to claim 17, characterized in that, The electrical equipment includes aircraft.

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