Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body, a battery monomer assembly and a fireproof cover assembly, the battery monomer assembly is arranged in the box body; the fireproof cover assembly comprises a fireproof cover and a one-way valve, the fireproof cover is provided with a containing cavity, the box body is arranged in the containing cavity, the fireproof cover is provided with an exhaust port communicated with the containing cavity, the one-way valve is arranged at the exhaust port, and the one-way valve is configured to allow gas in the containing cavity to be exhausted out of the containing cavity. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

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

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, this application provides a battery device, which includes a housing, a battery cell assembly, and a fireproof cover assembly. The battery cell assembly is disposed within the housing. The fireproof cover assembly includes a fireproof cover and a one-way valve. The fireproof cover has a receiving cavity, the housing is disposed within the receiving cavity, the fireproof cover has an exhaust port communicating with the receiving cavity, and the one-way valve is disposed at the exhaust port. The one-way valve is configured to allow gas in the receiving cavity to be discharged from the receiving cavity.

[0007] In the technical solution of this application embodiment, the battery cell assembly is housed within a casing. A fireproof cover houses the casing, reducing the impact on the external environment in the event of thermal runaway (high-temperature gas, liquid, or impurities generated by the battery cell assembly being ejected from the casing during thermal runaway) or fire, thus improving the reliability of the battery device. Simultaneously, an exhaust port is provided to expel gas from the casing, reducing the risk of explosion due to excessive gas accumulation, further enhancing the reliability of the battery device. Furthermore, a one-way valve is installed at the exhaust port, allowing gas to be discharged from the casing while reducing the entry of external gas into the casing. This reduces the risk of external air entering the casing and escalating the fire when the battery cell assembly catches fire, further improving the reliability of the battery device.

[0008] In some embodiments, the one-way valve includes a first valve body, a second valve body, a connecting post, and a resilient element. The first valve body is disposed within a fireproof cover and closes the exhaust port, and has a through hole. The second valve body is located on the side of the first valve body opposite to the receiving cavity. The connecting post is movably inserted through the through hole, and the end of the connecting post opposite to the receiving cavity is connected to the second valve body. One end of the resilient element is connected to the first valve body, and the other end of the resilient element is connected to the connecting post. The resilient element is configured to provide a force to the connecting post toward the receiving cavity, so that the second valve body closes the through hole.

[0009] The technical solution of this application embodiment, by setting an elastic element, provides a force to the connecting column to move towards the receiving cavity, thereby causing the second valve body to close the through hole, reducing the risk of outside air entering the receiving cavity and thus increasing the fire, which is beneficial to improving the reliability of the battery device. When there is a lot of gas in the receiving cavity, the gas can push the connecting column away from the receiving cavity, thereby causing the second valve body to move away from the first valve body to open the through hole, allowing the gas in the receiving cavity to be discharged from the through hole, reducing the risk of explosion caused by excessive gas in the receiving cavity, which is beneficial to improving the reliability of the battery device.

[0010] In some embodiments, the fireproof cover includes a first wall and a second wall disposed opposite to each other along a first direction, the first direction being parallel to the direction of gravity. The first wall is located below the second wall, and the housing is connected to the second wall, with the housing and the first wall spaced apart in the first direction. An exhaust port is disposed on the first wall.

[0011] The technical solution of this application embodiment reduces the risk of the housing blocking the exhaust port by setting the exhaust port on the first wall and the first wall and the housing being spaced apart in the first direction.

[0012] In some embodiments, the fireproof cover assembly further includes an exhaust pipe installed at the exhaust port, and a one-way valve installed at the exhaust pipe.

[0013] The technical solution of this application embodiment, by setting an exhaust pipe, allows the gas in the containment cavity to be directionally discharged through the exhaust pipe, reducing the risk of explosion due to excessive gas in the containment cavity, and also reducing the risk of the discharged gas affecting other battery devices or external components, thus improving the reliability of the battery device. Furthermore, the exhaust pipe may be relatively long, providing ample installation space for the one-way valve, which improves the reliability and convenience of installing the one-way valve.

[0014] In some embodiments, a one-way valve is installed at the outlet of the exhaust pipe, the outlet being located at the end of the exhaust pipe facing outwards from the receiving cavity and spaced apart from the exhaust port.

[0015] The technical solution of this application embodiment, by installing a one-way valve at the exhaust port of the exhaust pipe, facilitates the installation and maintenance of the one-way valve, and also provides more space between the exhaust port and the one-way valve, making it easier to install other components.

[0016] In some embodiments, the fireproof cover further includes a seal that seals the gap between the exhaust pipe and the exhaust port.

[0017] The technical solution of this application embodiment provides a seal between the exhaust pipe and the exhaust port to reduce the risk of outside air entering the containment cavity and thus increasing the fire intensity, thereby improving the reliability of the battery device.

[0018] In some embodiments, the fireproof cover assembly further includes a metal diaphragm installed inside the exhaust pipe to seal the exhaust pipe, the metal diaphragm being located between the one-way valve and the exhaust port, and the metal diaphragm being configured to rupture to expel gas from the containment chamber through the exhaust pipe.

[0019] The technical solution of this application embodiment, by setting a metal diaphragm between the one-way valve and the exhaust port, further reduces the risk of outside air entering the containment cavity and causing the fire to intensify, which is beneficial to improving the reliability of the battery device.

[0020] In some embodiments, the fireproof cover assembly further includes a filter element installed on the exhaust pipe.

[0021] The technical solution of this application embodiment, by setting a filter in the exhaust pipe, can help improve the reliability of the battery device by filtering the impurities in the gas when the battery cell assembly is in thermal runaway or on fire.

[0022] In some embodiments, the fireproof cover includes a support layer that forms a receiving cavity.

[0023] The technical solution of this application embodiment forms a cavity through a support layer, which reduces the impact on the outside world when the battery cell module experiences thermal runaway (when high-temperature gas, liquid or impurities generated by the battery cell module are ejected from the box) or fire, thereby improving the reliability of the battery device.

[0024] In some embodiments, the support layer includes either thermal calon fiber fireproof cloth or a glass fiber substrate.

[0025] In the technical solution of this application embodiment, the thermal calender fiber fireproof cloth and the glass fiber substrate are flexible materials. The selection of one of the thermal calender fiber fireproof cloth and the glass fiber substrate to form a support layer helps to reduce the assembly difficulty of the box set on the fireproof cover and reduce the risk of interference between the fireproof cover and the box.

[0026] In some embodiments, the fireproof cover further includes a sealing layer disposed on both sides of the support layer in the thickness direction.

[0027] The technical solution of this application embodiment provides a sealing layer on both sides of the support layer in the thickness direction, which helps to reduce the entry of external gas into the containment cavity. When the battery cell assembly catches fire, it reduces the risk of external air entering the containment cavity and causing the fire to intensify, thus improving the reliability of the battery device.

[0028] In some embodiments, the sealing layer includes one of a polytetrafluoroethylene composite film and a silicone rubber-based coating.

[0029] The technical solution of this application embodiment has good airtightness. Selecting either the polytetrafluoroethylene composite film or the silicone rubber base coating to form a sealing layer is beneficial to improving the airtightness of the sealing layer.

[0030] In some embodiments, the fireproof cover further includes a reflective heat insulation layer disposed on the side of the support layer facing the enclosure, and a sealing layer is provided between the reflective heat insulation layer and the support layer.

[0031] The technical solution of this application embodiment improves the heat insulation performance of the fireproof cover by setting a reflective heat insulation layer, thereby reducing the impact on the outside world when the battery cell module experiences thermal runaway (when high-temperature gas, liquid or impurities generated by the battery cell module are ejected from the box) or catches fire.

[0032] In some embodiments, the reflective heat insulation layer includes one of ceramic fiber, alumina fiber, phosphorus-nitrogen intumescent coating, paraffin wax, and graphene composite.

[0033] The technical solution of this application embodiment has good reflective heat insulation performance of ceramic fiber, alumina fiber, phosphorus nitrogen-based expansion coating, paraffin wax, and graphene composite. By selecting one of ceramic fiber, alumina fiber, phosphorus nitrogen-based expansion coating, paraffin wax, and graphene composite to form a reflective heat insulation layer, it is beneficial to improve the heat insulation performance of the fireproof cover. When the battery cell module experiences thermal runaway (when the battery cell module generates high-temperature gas, liquid, or impurities that are ejected from the box during thermal runaway) or catches fire, the impact on the outside world is reduced.

[0034] In some embodiments, the fireproof cover further includes a phase change layer disposed on the side of the reflective heat insulation layer facing the enclosure.

[0035] The technical solution of this application embodiment improves the heat absorption performance of the fireproof cover by setting a phase change layer, thereby reducing the impact on the outside world when the battery cell module experiences thermal runaway (when high-temperature gas, liquid or impurities generated by the battery cell module are ejected from the box) or fire.

[0036] In some embodiments, the phase change layer is made of one of stearic acid, lauric acid, and porous composite materials.

[0037] The technical solution of this application embodiment has good phase change heat absorption performance of stearic acid, lauric acid and porous matrix composite material. By selecting one of stearic acid, lauric acid and porous matrix composite material to form a phase change layer, it is beneficial to improve the heat absorption performance of the fireproof cover. When the battery cell module thermally runs away (when the battery cell module generates high temperature gas, liquid or impurities that are sprayed out from the box) or catches fire, the impact on the outside world is reduced.

[0038] Secondly, this application provides an electrical device including a battery device as described in any embodiment of the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0039] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0042] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0043] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the internal structure of a battery device provided in some embodiments of this application;

[0045] Figure 5 This is an exploded view of the structure of a fireproof cover assembly provided in some embodiments of this application;

[0046] Figure 6 This is an exploded view of the structure of a one-way valve provided in some embodiments of this application;

[0047] Figure 7 This is a schematic diagram of the internal structure of a battery device provided in other embodiments of this application;

[0048] Figure 8 A schematic diagram illustrating the arrangement of an exhaust pipe provided in other embodiments of this application;

[0049] Figure 9 This is a schematic diagram of the structure of the metal diaphragm provided in some embodiments of this application;

[0050] Figure 10 Partial schematic diagrams of fireproof covers are provided for some embodiments of this application.

[0051] Icons: 1-Battery assembly; 10-Casing; 11-First sub-casing; 12-Second sub-casing; 20-Battery cell assembly; 21-Battery cell; 211-Outer casing; 2111-Housing shell; 2112-End cap; 212-Electrode assembly; 213-Electrode terminal; 30-Fireproof cover assembly; 31-Fireproof cover; 311-Receiving cavity; 312-Exhaust port; 313-First wall; 314-Second wall; 315-Support layer ; 316-Sealing layer; 317-Reflective heat insulation layer; 318-Phase change layer; 32-One-way valve; 321-First valve body; 3211-Through hole; 322-Second valve body; 323-Connecting post; 324-Elastic element; 33-Exhaust pipe; 331-Air outlet; 34-Sealing element; 35-Metal diaphragm; 351-Score; 36-Filter element; 100-Vehicle; 110-Controller; 120-Motor; X-First direction. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0054] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, "second circuit board and / or first circuit board" can represent three cases: the second circuit board exists alone, the second circuit board and the first circuit board exist simultaneously, or the first circuit board exists alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0057] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0058] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0059] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0060] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0061] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0062] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0063] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0064] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0065] As an example, the box body can be part of the vehicle's chassis structure. For instance, the box body's roof can be part of the vehicle's floor, or the box body's frame can be part of the vehicle's crossbeams and longitudinal beams.

[0066] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0067] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0068] The battery cell may be, but is not limited to, 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.

[0069] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. 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.

[0070] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on one surface of the positive current collector.

[0071] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0072] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the positive electrode active material may include one of the following: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0074] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0075] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0076] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0077] As an example, the negative electrode active material may be any negative electrode active material known in the art for use in batteries. For example, the negative electrode active material may include one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0078] In some embodiments, the separator is a diaphragm. This application does not impose any particular limitation on the type of diaphragm; any known porous diaphragm with good chemical and mechanical stability can be selected.

[0079] As an example, the main material of the separator can be selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0080] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0081] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0082] In some implementations, the electrode assembly is a stacked structure.

[0083] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0084] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0085] In some embodiments, an electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0086] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0087] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0088] As an example, a battery cell can be a prismatic 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.

[0089] Currently, judging from market trends, battery devices are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage equipment, and many other fields. As the application areas for batteries continue to expand, the market demand is also constantly increasing.

[0090] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of battery devices is also a key consideration as environmental and / or internal battery conditions change.

[0091] During transportation or use, batteries may catch fire due to various reasons, such as thermal runaway or collisions. When a battery cell experiences thermal runaway (when high-temperature gases, liquids, or impurities generated by the battery cell are ejected from the casing) or catches fire, there is a risk of affecting the external environment (such as causing personal injury or property damage) and impacting the reliability of the battery device.

[0092] Based on the above considerations, in order to solve the problem of poor reliability of battery devices caused by thermal runaway or fire of individual battery cells, this application provides a battery device including a housing, individual battery cells, and a fireproof cover assembly. The individual battery cells are disposed within the housing. The fireproof cover assembly includes a fireproof cover and a one-way valve. The fireproof cover has a receiving cavity, the housing is disposed within the receiving cavity, the fireproof cover has an exhaust port communicating with the receiving cavity, and the one-way valve is disposed at the exhaust port. The one-way valve is configured to allow gas in the receiving cavity to be discharged from the receiving cavity.

[0093] In the technical solution of this application embodiment, the battery cell assembly is housed within a casing. A fireproof cover houses the casing, reducing the impact on the external environment in the event of thermal runaway (high-temperature gas, liquid, or impurities generated by the battery cell assembly being ejected from the casing during thermal runaway) or fire, thus improving the reliability of the battery device. Simultaneously, an exhaust port is provided to expel gas from the casing, reducing the risk of explosion due to excessive gas accumulation, further enhancing the reliability of the battery device. Furthermore, a one-way valve is installed at the exhaust port, allowing gas to be discharged from the casing while reducing the entry of external gas into the casing. This reduces the risk of external air entering the casing and escalating the fire when the battery cell assembly catches fire, further improving the reliability of the battery device.

[0094] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices. Electrical devices may include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0095] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0096] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 100 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 1 is installed inside the vehicle 100, and the battery device 1 can be located at the bottom, front, or rear of the vehicle 100. The battery device 1 can be used to power the vehicle 100; for example, the battery device 1 can serve as the operating power source for the vehicle 100's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 100.

[0097] The vehicle 100 may also include a controller 110 and a motor 120. The controller 110 is used to control the battery device 1 to supply power to the motor 120, for example, for the power needs of the vehicle 100 during startup, navigation and driving.

[0098] In some embodiments of this application, the battery device 1 can not only serve as the operating power source of the vehicle 100, but also as the driving power source of the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0099] The battery device includes battery cell modules and a power management system. The battery management system is connected to the battery cell modules and is used to manage the charging and discharging of the battery cell modules.

[0100] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. Figure 2 The structure of the fireproof cover assembly is concealed within. The battery device 1 may include a housing 10 and battery cells 21, with the battery cells 21 housed within the housing 10.

[0101] The housing 10 provides a space for housing the battery cell 21, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, and together define a space for housing the battery cell 21. The first sub-housing 11 may be a hollow structure with one open end, and the second sub-housing 12 may be a plate-like structure, which overlaps the open side of the first sub-housing 11 so that the first sub-housing 11 and the second sub-housing 12 together define the space; the first sub-housing 11 and the second sub-housing 12 may also be hollow structures with one open side, and the open side of the first sub-housing 11 overlaps the open side of the second sub-housing 12.

[0102] In the battery device 1, there can be multiple battery cells 21, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 21 are connected in both series and parallel configurations. Multiple battery cells 21 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 21 is housed within the housing 10. Alternatively, the battery device 1 can also consist of multiple battery cells 21 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 1 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 21.

[0103] Please refer to Figure 3 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. For example... Figure 3 As shown, the battery cell 21 includes a housing 211, an electrode assembly 212, and electrode terminals 213. The housing 211 includes a shell 2111 and an end cap 2112. The shell 2111 has an opening, and the end cap 2112 closes the opening to isolate the internal environment of the battery cell 21 from the external environment.

[0104] The housing 2111 is a component used to cooperate with the end cap 2112 to form the internal environment of the battery cell 21, wherein the formed internal environment can accommodate the electrode assembly 212, electrolyte, and other components. The housing 2111 and the end cap 2112 can be independent components. The housing 2111 can have various shapes and sizes. Specifically, the shape of the housing 2111 can be determined according to the specific shape and size of the electrode assembly 212. The housing 2111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0105] End cap 2112 refers to a component that covers the opening of housing 2111 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 2112 can be adapted to the shape of housing 2111 to fit it. Optionally, end cap 2112 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 2112 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 2112. Electrode terminals can be used for electrical connection with electrode assembly 212 to output or input electrical energy to battery cell 21. The material of end cap 2112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 2112. The insulating structure can be used to isolate the electrical connection components within the housing 2111 from the end cap 2112 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0106] Please refer to Figure 2 and refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the internal structure of a battery device provided in some embodiments of this application. Figure 5 This is an exploded view of the structure of a fireproof cover assembly provided in some embodiments of this application. This application provides a battery device 1, which includes a housing 10, a battery cell assembly 20, and a fireproof cover assembly 30. The battery cell assembly 20 is disposed within the housing 10. The fireproof cover assembly 30 includes a fireproof cover 31 and a one-way valve 32. The fireproof cover 31 has a receiving cavity 311, the housing 10 is disposed within the receiving cavity 311, and the fireproof cover 31 has an exhaust port 312 communicating with the receiving cavity 311. The one-way valve 32 is disposed at the exhaust port 312 and is configured to allow gas within the receiving cavity 311 to exit the receiving cavity 311.

[0107] In some embodiments, the fireproof cover 31 can be a closed structure, such that the housing 10 is disposed in the receiving cavity 311 of the fireproof cover 31, and the fireproof cover 31 can isolate the outside world from the battery cell assembly 20 when the battery cell assembly 20 experiences thermal runaway or fire.

[0108] In some embodiments, the fireproof cover 31 may be made of metal and its surface may be coated with a fire-retardant coating to achieve the function of fire protection. The fireproof cover 31 may include two parts, which together form a receiving cavity 311 for receiving the housing 10. The two parts may be connected by welding, bolting, or interference fit, and a sealing ring may be provided at the connection between the two parts.

[0109] In some embodiments, the fireproof cover 31 may be made of a flexible material and the surface of the fireproof cover 31 may be provided with a fire-retardant substance to achieve the fireproof function. The fireproof cover 31 may be provided with an opening and a zipper at the opening. The box 10 is disposed in the receiving cavity 311 through the opening and the opening is closed by the zipper.

[0110] In some embodiments, the fireproof cover 31 may be provided with an exhaust port 312, which connects the inner and outer sides of the fireproof cover 31 so that the exhaust port 312 can discharge the gas in the receiving cavity 311.

[0111] In some embodiments, the exhaust port 312 may be integrally formed with the fireproof cover 31 or machined.

[0112] In some embodiments, the number of exhaust ports 312 may be one.

[0113] In some embodiments, the number of exhaust ports 312 can be multiple, and the multiple exhaust ports 312 are arranged at intervals.

[0114] In some embodiments, the number of exhaust ports 312 can be four, with each pair of exhaust ports 312 forming a group of exhaust ports 312. The two groups of exhaust ports 312 are located on both sides of the length direction of the housing 10, and the two exhaust ports 312 in each group are spaced apart along the width direction of the housing 10.

[0115] In some embodiments, the fireproof cover 31 can be a flexible component, and the one-way valve 32 is disposed at the exhaust port 312. The one-way valve 32 can be disposed by setting a flange on the wall forming the exhaust port 312, and the flange is bolted to the fireproof cover 31. The one-way valve 32 is connected to the flange by welding or bolting.

[0116] In some embodiments, under normal conditions, the one-way valve 32 closes the exhaust port 312, preventing outside air from entering the containment cavity 311 through the exhaust port 312. When the battery cell assembly 20 experiences thermal runaway or catches fire, the generated high-temperature gas enters the containment cavity 311. When the concentration of the high-temperature gas is high, the one-way valve 32 is passively opened, allowing the high-temperature gas to be discharged from the containment cavity 311 through the exhaust port 312.

[0117] In the technical solution of this application embodiment, the battery cell assembly 20 is disposed within the housing 10. A fireproof cover 31 is provided to house the housing 10. This reduces the impact on the external environment in the event of thermal runaway of the battery cell assembly 20 (when high-temperature gas, liquid, or impurities generated by the battery cell assembly 20 are ejected from the housing 10) or fire, thus improving the reliability of the battery device 1. Simultaneously, an exhaust port 312 is provided to discharge gas from the housing cavity 311, reducing the risk of explosion due to excessive gas in the housing cavity 311, further improving the reliability of the battery device 1. Furthermore, a one-way valve 32 is provided at the exhaust port 312, allowing gas to be discharged from the housing cavity 311 while reducing the entry of external gas into the housing cavity 311. This reduces the risk of external air entering the housing cavity 311 and intensifying the fire when the battery cell assembly 20 catches fire, further improving the reliability of the battery device 1.

[0118] Please refer to Figure 3 and Figure 4 and refer to Figure 6 , Figure 6 This is an exploded view of the structure of a one-way valve provided in some embodiments of this application. In some embodiments, the one-way valve 32 includes a first valve body 321, a second valve body 322, a connecting post 323, and an elastic element 324. The first valve body 321 is disposed on a fireproof cover 31 and closes the exhaust port 312, and the first valve body 321 has a through hole 3211. The second valve body 322 is located on the side of the first valve body 321 facing away from the receiving cavity 311. The connecting post 323 is movably inserted through the through hole 3211, and one end of the connecting post 323 facing away from the receiving cavity 311 is connected to the second valve body 322. One end of the elastic element 324 is connected to the first valve body 321, and the other end of the elastic element 324 is connected to the connecting post 323. The elastic element 324 is configured to provide a force to the connecting post 323 to move towards the receiving cavity 311, so that the second valve body 322 closes the through hole 3211.

[0119] In some embodiments, the first valve body 321 may be disposed inside the exhaust port 312, and the outer diameter of the first valve body 321 may be equal to the inner diameter of the exhaust port 312 to close the exhaust port 312.

[0120] In some embodiments, the outer diameter of the second valve body 322 may be smaller than the inner diameter of the exhaust port 312, and the through hole 3211 of the first valve body 321 may be closed.

[0121] In some embodiments, the first valve body 321 may be located outside the exhaust port 312. For example, the first valve body 321 may be disposed on the wall surface with the exhaust port 312 and the exhaust port 312 may be closed.

[0122] In some embodiments, the first valve body 321 may be made of metal, such as stainless steel, iron, alloy, etc.

[0123] In some embodiments, the second valve body 322 may be made of metal, such as stainless steel, iron, alloy, etc.

[0124] In some embodiments, the first valve body 321 and the second valve body 322 may be made of the same material or different materials.

[0125] In some embodiments, the first valve body 321 may be disc-shaped.

[0126] In some embodiments, the second valve body 322 may be disc-shaped.

[0127] In some embodiments, the shape of the first valve body 321 may be the same as the cross-sectional shape of the exhaust port 312.

[0128] In some embodiments, the first valve body 321 and the second valve body 322 may be arranged along the extension direction of the exhaust port 312, with the second valve body 322 disposed on the side of the first valve body 321 away from the receiving cavity 311, that is, the second valve body 322 is disposed on the outside and the first valve body 321 is located on the inside.

[0129] In some embodiments, the connecting post 323 passes through the through hole 3211 of the first valve body 321. Both ends of the connecting post 323 are located on opposite sides of the first valve body 321. One end of the connecting post 323 is located on the side of the first valve body 321 facing away from the second valve body 322, and the other end of the connecting post 323 is connected to the second valve body 322. Because the connecting post 323 is movably inserted through the through hole 3211, the second valve body 322 can move relative to the first valve body 321.

[0130] In some embodiments, the outer diameter of the connecting post 323 may be smaller than the inner diameter of the through hole 3211 so that high-temperature gas can be discharged from the gap between the connecting post 323 and the inner wall of the through hole 3211 during exhaust.

[0131] In some embodiments, the elastic element 324 may be a spring, torsion spring, etc. One end of the elastic element 324 is connected to the surface of the first valve body 321 opposite to the second valve body 322, and the other end is connected to the end of the connecting post 323 opposite to the second valve body 322.

[0132] It should be noted that the end of the connecting post 323 facing away from the second valve body 322 can be provided on a boss so as to facilitate connection with the elastic element 324.

[0133] In some embodiments, under normal conditions, the first valve body 321 and the second valve body 322 are fitted together, such that the second valve body 322 closes the through hole 3211, and the elastic element 324 remains in its original shape, so that the connecting column 323 and the first valve body 321 remain stationary, thereby maintaining the fitted state of the first valve body 321 and the second valve body 322. When the concentration of high-temperature gas is high, the high-temperature gas pushes the end of the connecting column 323 away from the second valve body 322 to move closer to the first valve body 321, thereby driving the second valve body 322 away from the first valve body 321 through the connecting column 323. At this time, the through hole 3211 of the first valve body 321 is opened, the elastic element 324 is compressed, and the high-temperature gas flows through the gap between the inner wall of the connecting column 323 and the through hole 3211 through the first valve body 321, and is discharged from the gap between the inner wall of the second valve body 322 and the exhaust port 312.

[0134] The technical solution of this application embodiment, by setting an elastic element 324, provides a force to the connecting post 323 to move towards the receiving cavity 311, thereby causing the second valve body 322 to close the through hole 3211, reducing the risk of outside air entering the receiving cavity 311 and thus increasing the fire, which is beneficial to improving the reliability of the battery device 1. When there is a lot of gas in the receiving cavity 311, the gas can push the connecting post 323 away from the receiving cavity 311, thereby causing the second valve body 322 to move away from the first valve body 321, so as to open the through hole 3211, allowing the gas in the receiving cavity 311 to be discharged from the through hole 3211, reducing the risk of explosion caused by excessive gas in the receiving cavity 311, which is beneficial to improving the reliability of the battery device 1.

[0135] Please refer to Figure 4 In some embodiments, the fireproof cover 31 includes a first wall 313 and a second wall 314 disposed opposite to each other along a first direction X, the first direction X being parallel to the direction of gravity. The first wall 313 is located below the second wall 314, and the housing 10 is connected to the second wall 314. The housing 10 and the first wall 313 are spaced apart in the first direction X. An exhaust port 312 is disposed on the first wall 313.

[0136] In some embodiments, the first direction can be represented by the direction indicated by the letter X in the figure.

[0137] In some embodiments, the first direction X may be parallel to the height direction of the housing.

[0138] In some embodiments, the housing 10 is connected to the first wall 313, and the connection method can be bolt connection.

[0139] In some embodiments, when the battery device 1 supplies power to an electrical device, taking a vehicle as an example, the battery device 1 is installed at the bottom of the vehicle, and the housing 10 is connected to the bottom of the vehicle by bolts or other connecting parts. The fireproof cover 31 is provided with channels for the bolts or other connecting parts to pass through. The fireproof cover 31 has a downward tendency under the action of gravity, so that the second wall 314 contacts the housing 10.

[0140] In some embodiments, the exhaust port 312 is disposed on the first wall 313, and the housing 10 is spaced apart from the first wall 313 to reduce the risk of the housing 10 blocking the exhaust port 312.

[0141] In some embodiments, the exhaust port 312 is disposed on the first wall 313, and the housing 10 can contact the first wall 313. With the first direction X as the viewing direction, part of the exhaust port 312 is not obstructed by the housing 10.

[0142] The technical solution of this application embodiment reduces the risk of the housing 10 blocking the exhaust port 312 by setting the exhaust port 312 on the first wall 313 and the housing 10 being spaced apart in the first direction X.

[0143] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the internal structure of a battery device provided in other embodiments of this application. In some embodiments, the fireproof cover assembly 30 further includes an exhaust pipe 33, which is installed at the exhaust port 312, and a one-way valve 32 is installed at the exhaust pipe 33.

[0144] In some embodiments, the exhaust pipe 33 may be made of metal, such as iron, alloy, stainless steel, etc.

[0145] In some embodiments, the inner wall of the exhaust pipe 33 may be coated with a fire-retardant coating.

[0146] In some embodiments, the one-way valve 32 may be disposed on the flange, and the exhaust pipe 33 may be bolted to the flange.

[0147] In some embodiments, a one-way valve 32 is installed inside an exhaust pipe 33, which has an inlet near a receiving cavity 311 and an outlet 331 away from the receiving cavity 311. The one-way valve 32 may be located at the inlet; or, the one-way valve 32 may be located at the outlet 331; or, the one-way valve 32 may be located between the inlet and outlet 331 of the exhaust pipe 33.

[0148] In some embodiments, the one-way valve 32 is used to block the exhaust passage of the exhaust pipe 33 in one direction.

[0149] Please refer to Figure 7 and refer to Figure 8 , Figure 8 This is a schematic diagram of the exhaust pipe arrangement provided in other embodiments of this application. In some embodiments, the axial direction of the exhaust pipe 33 may be parallel to or intersect with the direction of gravity. By changing the extension direction of the exhaust pipe 33, the battery device 1 can achieve directional exhaust, especially when multiple battery devices 1 are used or transported together. By changing the extension direction of the exhaust pipe 33, the risk of affecting adjacent battery devices 1 when a single battery device 1 exhausts is reduced.

[0150] The technical solution of this application embodiment, by setting an exhaust pipe 33, allows the gas in the receiving cavity 311 to be directionally discharged through the exhaust pipe 33, reducing the risk of explosion due to excessive gas in the receiving cavity 311, and also reducing the risk of the discharged gas affecting other battery devices 1 or external components, thus improving the reliability of the battery device 1. At the same time, the exhaust pipe 33 may be relatively long, providing ample installation space for the one-way valve 32, which improves the reliability and convenience of installing the one-way valve 32.

[0151] Please refer to Figure 7 In some embodiments, a one-way valve 32 is installed at the outlet 331 of the exhaust pipe 33, the outlet 331 being located at the end of the exhaust pipe 33 facing out of the receiving cavity 311 and spaced apart from the exhaust port 312.

[0152] The technical solution of this application embodiment, by installing the one-way valve 32 at the outlet 331 of the exhaust pipe 33, facilitates the installation and maintenance of the one-way valve 32, and also provides more space between the exhaust port 312 and the one-way valve 32, making it easier to install other components.

[0153] Please refer to Figure 7 In some embodiments, the fireproof cover 31 further includes a seal 34 that seals the gap between the exhaust pipe 33 and the exhaust port 312.

[0154] In some embodiments, the seal 34 may be a sealing ring.

[0155] In some embodiments, the seal 34 may be made of a high-temperature resistant sealing material, such as flexible graphite, stainless steel spiral wound gasket, ceramic fiber, etc.

[0156] The technical solution of this application embodiment provides a sealing element 34 between the exhaust pipe 33 and the exhaust port 312 to reduce the risk of outside air entering the containment cavity 311 and thus increasing the fire intensity, which is beneficial to improving the reliability of the battery device 1.

[0157] Please refer to Figure 7 and refer to Figure 9 , Figure 9This is a schematic diagram of the structure of a metal diaphragm provided in some embodiments of this application. In some embodiments, the fireproof cover assembly 30 further includes a metal diaphragm 35, which is installed in the exhaust pipe 33 to seal the exhaust pipe 33. The metal diaphragm 35 is located between the one-way valve 32 and the exhaust port 312, and is configured to rupture to discharge gas from the receiving cavity 311 through the exhaust pipe 33.

[0158] In some embodiments, the metal diaphragm 35 may be made of aluminum, copper, iron, stainless steel, etc.

[0159] In some embodiments, a metal diaphragm 35 may be disposed on the side of the first valve body 321 of the one-way valve 32 that faces away from the second valve body 322, and the surface of the metal diaphragm 35 facing away from the first valve body 321 may be provided with a notch 351. When the concentration of high-temperature gas is high, the high-temperature gas impacts the metal diaphragm 35, causing it to rupture at the notch 351, thereby allowing the high-temperature gas to be discharged from the receiving cavity 311 through the one-way valve 32.

[0160] The technical solution of this application embodiment, by setting a metal diaphragm 35 between the one-way valve 32 and the exhaust port 312, further reduces the risk of outside air entering the containment cavity 311 and thus increasing the fire intensity, which is beneficial to improving the reliability of the battery device 1.

[0161] Please refer to Figure 7 In some embodiments, the fireproof cover assembly 30 further includes a filter 36, which is mounted on the exhaust pipe 33.

[0162] In some embodiments, the filter element 36 may be a filter screen, a sponge, etc.

[0163] In some embodiments, the filter element 36 may be disposed on the side of the metal diaphragm 35 away from the one-way valve 32 to reduce the risk of impurities damaging the metal diaphragm 35.

[0164] The technical solution of this application embodiment provides a filter 36 in the exhaust pipe 33. When the battery cell assembly 20 is in thermal runaway or on fire, impurities may be generated. When the exhaust pipe 33 discharges the gas in the accommodating cavity 311, the filter 36 filters the impurities in the gas, reducing the impact of impurities on the outside world and improving the reliability of the battery device 1.

[0165] Please refer to Figure 10 , Figure 10 Partial schematic diagrams of fireproof covers are provided for some embodiments of this application. In some embodiments, the fireproof cover 31 includes a support layer 315 that forms a receiving cavity 311.

[0166] In some embodiments, the support layer 315 is the main body of the fireproof cover 31, and the support layer 315 forms a receiving cavity 311.

[0167] In some embodiments, the support layer 315 may be made of metal, such as iron, alloy, stainless steel, etc.

[0168] In some embodiments, the support layer 315 can be made of a flexible material, such as thermal calender fiber fireproof cloth, glass fiber substrate, etc.

[0169] In some embodiments, the support layer 315 may have good structural strength, so that when the battery cell assembly 20 experiences thermal runaway or fire, the support layer 315 can retain the housing 10 and reduce the release of high-temperature gas or fire to the outside.

[0170] The technical solution of this application embodiment forms a receiving cavity 311 through the support layer 315. When the battery cell assembly 20 experiences thermal runaway (when the battery cell assembly 20 generates high-temperature gas, liquid or impurities that are ejected from the housing 10 during thermal runaway) or catches fire, it reduces the impact on the outside world and helps to improve the reliability of the battery device 1.

[0171] Please refer to Figure 10 In some embodiments, the support layer 315 includes either a heat-resistant fireproof cloth or a glass fiber substrate.

[0172] In some embodiments, a high-silica fiberglass cloth may be selected to form the support layer 315.

[0173] In the technical solution of this application embodiment, the thermal calender fiber fireproof cloth and the glass fiber substrate are flexible materials. The support layer 315 is formed by selecting one of the thermal calender fiber fireproof cloth and the glass fiber substrate, which helps to reduce the assembly difficulty of the box 10 on the fireproof cover 31 and reduce the risk of interference between the fireproof cover 31 and the box 10.

[0174] Please refer to Figure 10 In some embodiments, the fireproof cover 31 further includes a sealing layer 316, which is disposed on both sides of the support layer 315 in the thickness direction.

[0175] In some embodiments, the sealing layer 316 may be disposed on the surface of the support layer 315 facing the housing 10.

[0176] In some embodiments, the sealing layer 316 may be disposed on the surface of the support layer 315 opposite to the housing 10.

[0177] In some embodiments, the support layer 315 may form a receiving cavity 311, and the sealing layer 316 may be disposed on the surface of the support layer 315 facing the housing 10 and the surface of the support layer 315 away from the housing 10.

[0178] The technical solution of this application embodiment provides a sealing layer 316 on both sides of the support layer 315 in the thickness direction, which helps to reduce the entry of external gas into the containment cavity 311. When the battery cell assembly 20 catches fire, it reduces the risk of external air entering the containment cavity 311 and causing the fire to intensify, thus improving the reliability of the battery device 1.

[0179] Please refer to Figure 10 In some embodiments, the sealing layer 316 includes one of a polytetrafluoroethylene composite film and a silicone rubber-based coating.

[0180] In the technical solution of this application embodiment, the polytetrafluoroethylene composite film and the silicone rubber base coating have good air tightness. Selecting either the polytetrafluoroethylene composite film or the silicone rubber base coating to form the sealing layer 316 is beneficial to improving the air tightness of the sealing layer 316.

[0181] Please refer to Figure 10 In some embodiments, the fireproof cover 31 further includes a reflective heat insulation layer 317, which is disposed on the side of the support layer 315 facing the housing 10, and a sealing layer 316 is provided between the reflective heat insulation layer 317 and the support layer 315.

[0182] In some embodiments, a sealing layer 316 is provided on the surface of the support layer 315 facing the housing 10, and a reflective heat insulation layer 317 is provided on the surface of the sealing layer 316 facing the housing 10. When the battery cell assembly 20 experiences thermal runaway or fire, the reflective heat insulation layer 317 can effectively prevent high temperatures from spreading to the surface of the support layer 315 away from the housing 10.

[0183] The technical solution of this application embodiment improves the heat insulation performance of the fireproof cover 31 by setting a reflective heat insulation layer 317, thereby reducing the impact on the outside world when the battery cell assembly 20 experiences thermal runaway (when the battery cell assembly 20 generates high-temperature gas, liquid or impurities that are ejected from the housing 10 during thermal runaway) or catches fire.

[0184] Please refer to Figure 10 In some embodiments, the reflective heat insulation layer 317 includes one of ceramic fiber, alumina fiber, phosphorus-nitrogen expanded coating, paraffin wax, and graphene composite.

[0185] The technical solution of this application embodiment has good reflective heat insulation performance of ceramic fiber, alumina fiber, phosphorus nitrogen-based expansion coating, paraffin wax, and graphene composite. By selecting one of ceramic fiber, alumina fiber, phosphorus nitrogen-based expansion coating, paraffin wax, and graphene composite to form reflective heat insulation layer 317, it is beneficial to improve the heat insulation performance of fireproof cover 31. When the battery cell assembly 20 thermally runs away (when thermal runaway occurs, high-temperature gas, liquid, or impurities generated by the battery cell assembly 20 are ejected from the housing 10) or catch fire, the impact on the outside world is reduced.

[0186] Please refer to Figure 10 In some embodiments, the fireproof cover 31 further includes a phase change layer 318, which is disposed on the side of the reflective heat insulation layer 317 facing the housing 10.

[0187] In some embodiments, a sealing layer 316 is provided on the surface of the support layer 315 facing the housing 10, a reflective heat insulation layer 317 is provided on the surface of the sealing layer 316 facing the housing 10, and a phase change layer 318 is provided on the surface of the reflective heat insulation layer 317 facing the housing 10. When the battery cell assembly 20 experiences thermal runaway or fire, the phase change layer 318 can effectively absorb heat and prevent high temperatures from spreading to the surface of the support layer 315 facing away from the housing 10.

[0188] The technical solution of this application embodiment, by setting a phase change layer 318, is beneficial to improve the heat absorption performance of the fireproof cover 31, and reduces the impact on the outside world when the battery cell assembly 20 thermally runs away (when the battery cell assembly 20 generates high-temperature gas, liquid or impurities that are sprayed out from the box 10) or catches fire.

[0189] Please refer to Figure 10 In some embodiments, the phase change layer 318 is made of one of stearic acid, lauric acid, and porous matrix composites.

[0190] The technical solution of this application embodiment has good phase change heat absorption performance of stearic acid, lauric acid and porous matrix composite material. By selecting one of stearic acid, lauric acid and porous matrix composite material to form phase change layer 318, it is beneficial to improve the heat absorption performance of fireproof cover 31. When the battery cell assembly 20 thermally runs away (when thermal runaway occurs, high temperature gas, liquid or impurities generated by the battery cell assembly 20 are ejected from the box 10) or catch fire, the impact on the outside world is reduced.

[0191] Please refer to Figure 1 This application provides an electrical device, including a battery device 1 as described in any of the above embodiments, wherein the battery device 1 is used to provide electrical energy to the electrical device.

[0192] Please refer to Figure 2 and Figure 7 In some embodiments, the battery device 1 includes a housing 10, a battery cell assembly 20, and a fireproof cover assembly 30. The battery cell assembly 20 is disposed within the housing 10. The fireproof cover assembly 30 includes a fireproof cover 31 and a one-way valve 32. The fireproof cover 31 has a receiving cavity 311, and the housing 10 is disposed within the receiving cavity 311.

[0193] In some embodiments, in the direction of gravity, the bottom wall of the fireproof cover 31 is provided with an exhaust port 312 communicating with the receiving cavity 311, an exhaust pipe 33 is installed at the exhaust port 312, and a one-way valve 32 is installed at the exhaust pipe 33.

[0194] In the technical solution of this application embodiment, the battery cell assembly 20 is disposed within the housing 10. A fireproof cover 31 is provided to house the housing 10. This reduces the impact on the external environment in the event of thermal runaway of the battery cell assembly 20 (when high-temperature gas, liquid, or impurities generated by the battery cell assembly 20 are ejected from the housing 10) or fire, thus improving the reliability of the battery device 1. Simultaneously, an exhaust port 312 is provided to discharge gas from the housing cavity 311, reducing the risk of explosion due to excessive gas in the housing cavity 311, further improving the reliability of the battery device 1. Furthermore, a one-way valve 32 is provided at the exhaust port 312, allowing gas to be discharged from the housing cavity 311 while reducing the entry of external gas into the housing cavity 311. This reduces the risk of external air entering the housing cavity 311 and intensifying the fire when the battery cell assembly 20 catches fire, further improving the reliability of the battery device 1.

[0195] Meanwhile, by setting up the exhaust pipe 33, a larger installation space is provided for the one-way valve 32, and by changing the orientation of the exhaust pipe 33, the high-temperature gas of the battery cell assembly 20 can be directionally discharged.

[0196] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Box; Battery cell assembly is disposed within the housing; A fireproof cover assembly includes a fireproof cover and a one-way valve. The fireproof cover has a receiving cavity, and a housing is disposed within the receiving cavity. The fireproof cover is provided with an exhaust port communicating with the receiving cavity, and the one-way valve is disposed at the exhaust port. The one-way valve is configured to allow gas in the receiving cavity to be discharged from the receiving cavity.

2. The battery device according to claim 1, characterized in that, The one-way valve includes: A first valve body is disposed on the fireproof cover and closes the exhaust port; the first valve body is provided with a through hole. The second valve body is located on the side of the first valve body that is away from the receiving cavity; A connecting post is movably inserted through the through hole, and the end of the connecting post facing away from the receiving cavity is connected to the second valve body; An elastic element, one end of which is connected to the first valve body and the other end of which is connected to the connecting post, is configured to provide a force to the connecting post to move toward the receiving cavity, so that the second valve body closes the through hole.

3. The battery device according to claim 1, characterized in that, The fireproof cover includes a first wall and a second wall arranged opposite to each other along a first direction, the first direction being parallel to the direction of gravity, the first wall being located below the second wall, the box being connected to the second wall, and the box being spaced apart from the first wall in the first direction; The exhaust port is located on the first wall.

4. The battery device according to claim 1, characterized in that, The fireproof cover assembly also includes an exhaust pipe, which is installed at the exhaust port, and the one-way valve is installed on the exhaust pipe.

5. The battery device according to claim 4, characterized in that, The one-way valve is installed at the outlet of the exhaust pipe, and the outlet is located at the end of the exhaust pipe facing out of the receiving cavity, and is spaced apart from the exhaust port.

6. The battery device according to claim 4, characterized in that, The fireproof cover also includes a sealing element that seals the gap between the exhaust pipe and the exhaust port.

7. The battery device according to claim 4, characterized in that, The fireproof cover assembly also includes a metal diaphragm installed inside the exhaust pipe to seal the exhaust pipe. The metal diaphragm is located between the one-way valve and the exhaust port and is configured to rupture to discharge gas from the containment cavity through the exhaust pipe.

8. The battery device according to claim 4, characterized in that, The fireproof cover assembly also includes a filter element, which is installed on the exhaust pipe.

9. The battery device according to claim 1, characterized in that, The fireproof cover includes a support layer that forms the receiving cavity.

10. The battery device according to claim 9, characterized in that, The support layer includes either heat-resistant fireproof cloth made of thermal calender fiber or glass fiber substrate.

11. The battery device according to claim 9, characterized in that, The fireproof cover also includes a sealing layer, which is disposed on both sides of the support layer in the thickness direction.

12. The battery device according to claim 11, characterized in that, The sealing layer includes either a polytetrafluoroethylene composite film or a silicone rubber-based coating.

13. The battery device according to claim 11, characterized in that, The fireproof cover also includes a reflective heat insulation layer, which is disposed on the side of the support layer facing the box, and the sealing layer is provided between the reflective heat insulation layer and the support layer.

14. The battery device according to claim 13, characterized in that, The reflective heat insulation layer includes one of ceramic fiber, alumina fiber, phosphorus-nitrogen-based intumescent coating, paraffin wax, and graphene composite.

15. The battery device according to claim 13, characterized in that, The fireproof cover also includes a phase change layer, which is disposed on the side of the reflective heat insulation layer facing the enclosure.

16. The battery device according to claim 15, characterized in that, The phase change layer is made of one of stearic acid, lauric acid, and porous matrix composite materials.

17. An electrical appliance, characterized in that, The battery device includes any one of claims 1-16, the battery device being used to provide electrical energy to the electrical device.

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