Battery device and electric appliance

Abstract

The application provides a battery device and an electric device. The battery device is arranged in a battery cabin of the electric device and supplies power for the electric device. A first cabin wall of the battery cabin is provided with a discharge port communicating with an external space of the electric device. The battery device comprises: a plurality of battery monomers; a battery box having a containing cavity containing the battery monomers, wherein a first box wall of the battery box is provided with a pressure relief port, the first box wall is opposite to the first cabin wall along a first direction, and a space is formed between the first box wall and the first cabin wall; and a flow guide member arranged between the first box wall and the first cabin wall, wherein the flow guide member has a flow guide channel, the flow guide channel communicates the pressure relief port and the discharge port, the first box wall is a bottom wall of the battery box, and the first cabin wall is a bottom wall of the battery cabin. The battery device and the electric device provided by the application can reduce the risk of fire in the case of thermal runaway.

Description

Technical Field

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

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] How to reduce the risk of battery fires under thermal runaway conditions is one of the topics that the industry needs to study. Utility Model Content

[0004] This application provides a battery device and electrical equipment that can reduce the risk of fire in the event of thermal runaway.

[0005] The technical solution of this application embodiment is implemented as follows: The first aspect of this application provides a battery device for installation in the battery compartment of an electrical device and for supplying power to the electrical device. The first wall of the battery compartment forms a discharge port that connects to the external space of the electrical device. The battery device includes: a plurality of battery cells; a battery box having a receiving cavity for accommodating the battery cells, the first wall of the battery box having a pressure relief port, the first wall of the battery box and the first compartment wall being opposite to each other along a first direction and having a gap between them; a flow guide disposed between the first wall of the battery box and the first compartment wall, the flow guide having a flow channel connecting the pressure relief port and the discharge port, the first wall of the battery box being the bottom wall of the battery box, and the first compartment wall being the bottom wall of the battery compartment.

[0006] In the embodiments of this application, by setting up a flow guide, in the event of thermal runaway of a battery cell, the effluent can enter the flow guide through the pressure relief port of the first housing wall, and under the guidance of the flow guide channel, be discharged into the external space of the electrical device through the discharge port of the first compartment wall. Because the flow guide extends the discharge path of the effluent, the temperature of the effluent gradually decreases as it passes through the flow guide, which helps to reduce the temperature of the effluent discharged into the external space, thereby reducing the risk of effluent fire. Furthermore, the flow guide is positioned between the first housing wall and the first compartment wall, which are opposite each other along the first direction. This facilitates the installation of the flow guide and battery device into the battery compartment, and reduces the space occupied in the direction perpendicular to the first direction. Moreover, the first housing wall is the bottom wall of the battery box, and the first compartment wall is the bottom wall of the battery compartment. Thus, by spraying the effluent downwards, the impact on the portion of the electrical device located above the battery compartment is reduced, significantly reducing damage to the electrical device and the passenger compartment located above the battery compartment.

[0007] In some embodiments, the flow guide includes a flow guide tube body and a first connecting portion and a second connecting portion respectively connected to both ends of the flow guide tube body. The inner channel of the flow guide tube body is a flow guide channel. The first connecting portion is connected to the first box wall, and the second connecting portion is used to connect to the first bulkhead.

[0008] Thus, by setting the first connecting part and the second connecting part, the flow guide is connected to the first box wall and the first compartment wall respectively, which improves the connection reliability between the flow guide and the battery box and the battery compartment, thereby improving the flow guide effect of the flow guide on the emissions and reducing the risk of fire in the battery device.

[0009] In some embodiments, the first connecting portion is disposed around the outer peripheral surface of one end of the guide tube body and abuts against the surface of the first box wall facing the first compartment wall, and the second connecting portion is disposed around the outer peripheral surface of the other end of the guide tube body and is used to contact the surface of the first compartment wall facing the first box wall and connected by fasteners.

[0010] Thus, the first connecting part is arranged around the guide tube body, which increases the contact area between the first connecting part and the first tank wall, improving the reliability of the connection. It also improves the sealing performance at the connection point, creating a negative oxygen environment within the guide tube. This reduces the likelihood of ignition of emissions passing through this space and decreases the chance of emissions escaping into the battery compartment, minimizing the impact of high-temperature emissions on the battery and electrical components, thereby improving their operational reliability. Similarly, the second connecting part is arranged around the guide tube body, increasing the contact area between the second connecting part and the first compartment wall, improving the reliability of the connection. It also improves the sealing performance at the connection point, reducing the chance of emissions escaping into the battery compartment and minimizing the impact of high-temperature emissions on the battery and electrical components, thereby improving their operational reliability. Furthermore, the reliable connection between the second connecting part and the first compartment wall using fasteners improves the stability of the guide tube during depressurization, preventing it from detaching due to vibration or impact, further ensuring the integrity of the gas emission path.

[0011] In some embodiments, the battery device further includes a first seal sandwiched between the first connection portion and the first housing wall, and disposed around the pressure relief port.

[0012] Thus, by setting a first sealing element between the first connecting part and the first box wall, the sealing performance at the connection between the first connecting part and the first box wall can be improved, and the negative oxygen environment in the flow channel can be maintained, making it less likely for the exhaust to ignite when passing through this channel. In addition, the impact of leaked high-temperature gas on the battery device and the electrical device can be reduced, thereby improving the operational reliability of the battery device and the electrical device.

[0013] In some embodiments, a limiting groove is formed on the surface of the first connecting portion facing the first box wall, a portion of the first sealing member is disposed in the limiting groove, and the remaining portion extends out of the limiting groove and abuts against the first box wall.

[0014] Thus, by setting the limiting groove, the limiting effect on the first seal can be improved, allowing the first seal to better perform its sealing effect, thereby maintaining a negative oxygen environment in the flow channel, making it less likely for the emitted materials to ignite when passing through this channel, and reducing the impact of leaked high-temperature gas on the battery device and electrical device, thereby improving the operational reliability of the battery device and electrical device.

[0015] In some embodiments, the battery device further includes a first pressure relief mechanism, which is located at one end of the guide tube body connected to the second connection portion. The first pressure relief mechanism is connected to the second connection portion and extends out of the external space through the discharge port.

[0016] Thus, by installing a first pressure relief mechanism at the outlet of the guide tube, the guide tube can be opened to discharge emissions in the event of thermal runaway of the battery device. Under normal conditions, the outlet of the guide tube is sealed by the first pressure relief mechanism, reducing the probability of foreign objects such as dust particles from the external space entering the guide tube and the battery compartment through the guide tube, thereby reducing the impact of foreign objects on the operation of the battery device and the guide tube. In addition, since part of the first pressure relief mechanism extends into the external space through the discharge port, the emissions discharged from the first pressure relief mechanism directly enter the external space, making it difficult for emissions to enter the battery compartment, thereby reducing the possibility of damage to the battery device.

[0017] In some embodiments, the battery device further includes a second seal sandwiched between the second connection and the first bulkhead, and disposed around the discharge port.

[0018] Thus, by providing a second seal between the second connection and the first bulkhead, the sealing performance at the connection between the second connection and the first bulkhead can be improved, reducing the impact of leaked high-temperature gas on the battery device and electrical devices, thereby improving the operational reliability of the battery device and electrical devices.

[0019] In some embodiments, the flow guide includes a flow guide body that extends along a tortuous direction.

[0020] This design allows the guide tube to be tortuous, enabling a longer guide tube to be accommodated within a given space. This, in turn, facilitates extending the exhaust path, further reducing the temperature of the exhaust gases exiting the outlet, and further lowering the risk of the exhaust gases igniting.

[0021] In some embodiments, the guide pipe includes at least one straight pipe section and at least one bent pipe section, wherein the straight pipe section and the bent pipe section are connected and communicate with each other.

[0022] Thus, by incorporating a bend in the pipe section, the guide pipe becomes a tortuous shape, which facilitates extending the exhaust path. The combination of straight and bend sections allows for a longer guide pipe within a given space, and the straight section promotes smoother emission. Furthermore, the bend section helps to trap high-temperature combustible particles in the emissions, further reducing the risk of ignition.

[0023] In some embodiments, the flow guide includes a flow guide body, which includes a main pipe section and a first variable diameter pipe section and a second variable diameter pipe section respectively connected to the two ends of the main pipe section. The maximum flow area of ​​the main pipe section is not greater than the minimum flow area of ​​the first variable diameter pipe section and is not greater than the minimum flow area of ​​the second variable diameter pipe section. Along the flow direction of the flow guide body, the first variable diameter pipe section is located between the pressure relief port and the main pipe section, and the second variable diameter pipe section is located between the main pipe section and the discharge port. From the pressure relief port to the main pipe section, the flow area of ​​the first variable diameter pipe section gradually decreases, and from the main pipe section to the discharge port, the flow area of ​​the first variable diameter pipe section gradually increases.

[0024] Thus, the larger flow area at the end of the first reducing pipe section furthest from the main pipe section allows it to cover the pressure relief port of the battery compartment, facilitating the more thorough diversion of emissions into the guide pipe. Similarly, the larger flow area at the end of the second reducing pipe section furthest from the main pipe section allows it to cover the discharge port of the first bulkhead, reducing the possibility of emissions escaping into the battery compartment and minimizing the impact of high-temperature emissions on the battery and electrical components, thereby improving their operational reliability. Furthermore, by setting a smaller flow area for the main pipe section, space is saved, and a longer flow path can be created within a given space, further reducing the temperature of emissions discharged through the discharge port and further lowering the risk of emissions ignition.

[0025] In some embodiments, the main pipe section includes multiple straight pipe sections and at least one bend pipe section. The multiple straight pipe sections are arranged in a cross manner, and adjacent straight pipe sections are connected and communicated through bend pipe sections; and / or, the first reducing pipe section is connected and communicated with the straight pipe section through a bend pipe section; and / or, the second reducing pipe section is connected and communicated with the straight pipe section through a bend pipe section.

[0026] Thus, the bends can be formed at both ends of the main pipe section or in the middle of the main pipe section. By connecting the bends between adjacent straight pipe sections, and / or between the first reducing pipe section and the straight pipe section, and / or between the second reducing pipe section and the straight pipe section, the extension direction is changed by the bends, reducing the space occupied in the same straight direction. Therefore, within a certain space, a guide pipe with a longer flow path can be accommodated, which is conducive to further reducing the temperature of the emissions discharged through the discharge port and further reducing the risk of emissions ignition.

[0027] In some embodiments, the plurality of straight pipe segments include a first straight pipe segment, a second straight pipe segment, and a third straight pipe segment, and at least one bent pipe segment includes a first bent pipe segment, a second bent pipe segment, and a third bent pipe segment. The first straight pipe segment extends along a second direction, with one end connected and communicating with a first reducing pipe segment, and the other end connected and communicating with the second straight pipe segment through the first bent pipe segment. The second straight pipe segment extends along a third direction, with its end away from the first bent pipe segment connected and communicating with the third straight pipe segment through the second bent pipe segment. The third straight pipe segment extends along the second direction and is located on the same side of the second straight pipe segment along the second direction. The end of the third straight pipe segment away from the second bent pipe segment is connected and communicating with the second reducing pipe segment through the third bent pipe segment. The second direction, the third direction, and the first direction intersect each other.

[0028] This design results in a relatively long flow channel along the direction of flow of the flow guide pipe, which helps to reduce the temperature of the emissions discharged through the outlet, further reducing the risk of emissions ignition. Furthermore, most sections of the flow guide pipe extend upwards in the second and third directions, occupying less space in the first direction. This helps to reduce the volume of the battery compartment, facilitates the miniaturization of electrical devices, and allows for the housing of more battery devices within a given battery compartment volume.

[0029] In some embodiments, the second reducing pipe section extends along the first direction, one end of the third bend pipe section is connected to the third straight pipe section, and the other end bends toward the first bulkhead and is connected and communicates with the second reducing pipe section.

[0030] Thus, by setting the extension direction of the second variable diameter pipe section to be consistent with the first direction, so that the large opening of the second variable diameter pipe section is directly opposite the discharge port of the first bulkhead, the discharged material can flow smoothly through the second variable diameter pipe section to the discharge port and be discharged into the external space through the discharge port.

[0031] In some embodiments, the first variable diameter pipe section extends along the second direction, and the guide pipe body further includes a connecting bend, one end of which is connected to and communicates with the first variable diameter pipe section, and the other end is bent toward the first tank wall and communicates with the pressure relief port.

[0032] Thus, by extending the first variable diameter pipe section along the second direction, the size of the first variable diameter pipe section along its extension direction can be set to be relatively large, so that the inclination of the inclined inner wall of the first variable diameter pipe section is relatively small, reducing the vortex dead zone caused by sudden contraction, improving the smoothness of discharge, and also helping to reduce the impact force of the discharge material on the inclined inner wall, which helps to improve the structural and positional stability of the guide component, so that the guide component can better play its guiding role.

[0033] In some embodiments, the guide further includes a first connecting portion, which is connected to and surrounding the connecting bend, and abuts against the surface of the first tank wall facing the first bulkhead.

[0034] Thus, the first connecting part is arranged around the connecting bend, which helps to increase the contact area between the first connecting part and the first box wall, improve the connection reliability between the two, and also helps to improve the sealing performance at the connection point. This allows the space inside the guide to form a negative oxygen environment, making it less likely for emissions to ignite when passing through this space. It also reduces the probability of emissions escaping into the battery compartment, reduces the impact of high-temperature emissions on the battery device and electrical devices, thereby improving the operational reliability of the battery device and electrical devices.

[0035] In some embodiments, the flow guide further includes a second connecting portion, which is connected to and surrounding the second variable diameter pipe section, and is used to contact the surface of the first bulkhead facing the first tank wall and to be connected by fasteners.

[0036] The second connection part is arranged around the second variable diameter pipe section, which helps to increase the contact area between the second connection part and the first bulkhead, improve the connection reliability between the two, and also helps to improve the sealing performance at the connection, reduce the probability of emissions escaping into the battery compartment, reduce the impact of high temperature emissions on the battery device and electrical device, thereby improving the operational reliability of the battery device and electrical device.

[0037] In some embodiments, the battery cell includes an electrode assembly, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode active material, the positive electrode active material is lithium nickel cobalt manganese oxide, wherein the molar content of nickel is more than 90%, and the length of the flow channel along its flow direction is greater than or equal to 400 mm and less than or equal to 900 mm.

[0038] Thus, the battery cells have a high energy density, and when thermal runaway occurs and they erupt, they are more likely to produce more emissions. By matching them with a flow guide with a length of 400 mm or more and 900 mm or less, the temperature of the emissions released into the external space can be greatly reduced, thereby reducing the risk of emissions igniting.

[0039] In some embodiments, the electrode assembly further includes a negative electrode sheet, which includes a negative electrode active material, which includes graphite and silicon-based materials. The silicon-based material accounts for 5% of the total mass of the negative electrode active material, and the length of the flow channel along its flow direction is greater than or equal to 400 mm and less than or equal to 600 mm.

[0040] In this way, the emissions generated by the battery device can be discharged through a guide member with a length of 400 mm or more and less than or equal to 600 mm. This length of guide member can meet the cooling requirements of the emissions and prevent them from catching fire. It also reduces the problem of large space occupation due to the guide member being too long.

[0041] In some embodiments, the electrode assembly further includes a negative electrode sheet, which includes a negative electrode active material, which includes graphite and silicon-based materials. The silicon-based material accounts for 40% of the total mass of the negative electrode active material, and the length of the flow channel along its flow direction is greater than or equal to 700 mm and less than or equal to 900 mm.

[0042] In this way, the emissions generated by the battery device can be discharged through a guide with a length of 700 mm or more and 900 mm or less. This length of guide can meet the cooling requirements of the emissions and prevent them from catching fire. It also reduces the problem of large space occupation due to the guide being too long.

[0043] In some embodiments, the end of the guide near the discharge port is provided with a filter screen and / or a first pressure relief mechanism.

[0044] The filter screen removes larger particles from the emissions, retaining larger flammable particles in a negative oxygen environment to reduce the risk of ignition. Smaller, non-flammable particles and gases are released into the external space, reducing the risk of fire. A first pressure relief mechanism allows the guide tube to open in the event of thermal runaway of the battery, allowing emissions to be discharged. Under normal conditions, the outlet of the guide tube is sealed by the first pressure relief mechanism, reducing the likelihood of dust particles and other foreign objects from the external space entering the guide tube and the battery compartment, thus minimizing the impact of foreign objects on the operation of the battery and the guide tube.

[0045] In some embodiments, the battery box includes a box body and a box cover. The box cover and the box body are fastened together along a first direction, forming a receiving cavity between them. The box body includes a support wall and a first box wall. The support wall supports a battery cell from one side of the first direction. The first box wall is located on the side of the support wall opposite to the battery cell along the first direction and forms a pressure relief cavity with the support wall. The support wall has a vent hole that runs through the first direction. The vent hole is closed by a sealing member. When the pressure or temperature on the sealing member reaches a predetermined threshold, the vent hole opens.

[0046] Thus, by forming a pressure relief chamber, the emissions from multiple battery cells can be collected into the pressure relief chamber and then discharged externally through the guide. On the one hand, the setting of the pressure relief chamber can further extend the discharge path of the emissions, which helps to reduce the temperature of the emissions discharged through the discharge port and further reduces the risk of emissions ignition. On the other hand, the pressure relief chamber is used to collect the emissions from each battery cell, so that fewer pressure relief ports can be set in the first tank wall, and only one or a few guides are needed for discharge, which helps to simplify the structure of the battery device.

[0047] In some embodiments, the first tank wall is formed with a plurality of pressure relief ports, and a plurality of flow guides are provided, each flow guide being connected to at least one pressure relief port.

[0048] In this way, by setting multiple pressure relief ports and multiple flow guides, the exhaust efficiency can be improved and the risk of battery explosion can be reduced.

[0049] The second aspect of this application provides an electrical device, including: an electrical device having a battery housing cavity; and a battery device provided in the first aspect, disposed within the battery housing cavity.

[0050] Because the electrical equipment includes a battery device, and because the electrical equipment includes all the beneficial effects of the battery device, the electrical equipment can reduce the risk of fire in the event of thermal runaway.

[0051] In some embodiments, the electrical device includes an aircraft, which includes a battery device and a body that serves as the electrical device.

[0052] Therefore, the risk of the aircraft catching fire in the event of thermal runaway is low. Attached Figure Description

[0053] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1A schematic diagram of the structure of an electrical device (aircraft) according to one or more embodiments; Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments; Figure 3 This is a schematic diagram of a battery device applied to an electrical device according to one or more embodiments; Figure 4 An exploded view of the battery device and the first bulkhead of the battery compartment according to one or more embodiments; Figure 5 This is a structural schematic diagram of a portion of a battery device according to one or more embodiments, illustrating the flow guide and the first seal; Figure 6 This is a structural schematic diagram from another perspective of a portion of the structure of a battery device according to one or more embodiments, illustrating the flow guide and the first pressure relief mechanism; Figure 7 A cross-sectional view of a battery device according to one or more embodiments; Figure 8 This is an exploded perspective view of a battery cell according to one or more embodiments.

[0054] Explanation of reference numerals in the attached figures 1000, Aircraft; 100, Battery Unit; 200, Airframe; 200a, Electrical Equipment; 201, Battery Compartment; 202, First Bulkhead; 2021, Discharge Port; 1, Battery Box; 10, Receiving Cavity; 20, Pressure Relief Chamber; 11, Box Body; 111, First Box Wall; 1111, Pressure Relief Port; 112, Bearing Wall; 1121, Vent Hole; 113, Sealing Component; 12, Box Cover; 2, Battery Cell; 21, Outer Shell; 211, Shell; 212, End Cap; 22, Electrode Assembly; 23, Second Pressure Relief Mechanism; 3, Flow Guide; 31, Flow Guide Pipe. 311. Main pipe section; 3111. Straight pipe section; 3111a. First straight pipe section; 3111b. Second straight pipe section; 3111c. Third straight pipe section; 3112. Bend section; 3112a. First bend section; 3112b. Second bend section; 3112c. Third bend section; 312. First reducing pipe section; 313. Second reducing pipe section; 314. Connecting bend; 32. First connecting part; 33. Second connecting part; 331. Connecting hole; 4. First sealing element; 5. First pressure relief mechanism; X. First direction; Y. Second direction; Z. Third direction.

[0055] It should be noted that the terms "first" and "second" mentioned above are only used to distinguish between different options and do not represent the degree of superiority or inferiority of the options or their priority in the implementation process. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0058] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0059] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0060] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0061] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0062] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0063] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0064] The following is a detailed description of this application.

[0065] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0066] In related technologies, in the event of thermal runaway in a battery device, internal emissions are directly released to the outside through pressure relief vents in the battery box wall. The emitted emissions are at high temperatures and are prone to ignition at the point of discharge, potentially affecting the normal operation of the battery device itself or other equipment. Therefore, this application designs a battery device that can reduce the risk of fire.

[0067] This application designs a battery device for installation in the battery compartment of an electrical device and for supplying power to the electrical device. The first wall of the battery compartment forms a discharge port that connects to the external space of the electrical device. The battery device includes a battery box, a flow guide, and multiple battery cells. The battery box has a receiving cavity for accommodating the battery cells. The first wall of the battery box forms a pressure relief port. The first wall and the first compartment wall are opposite each other along a first direction and are spaced apart. The flow guide is disposed between the first wall and the first compartment wall and has a flow channel that connects the pressure relief port and the discharge port.

[0068] According to this design, by setting up the flow guide, in the event of thermal runaway of a battery cell, the effluent can enter the flow guide through the pressure relief port of the first tank wall, and under the guidance of the flow guide channel, be discharged into the external space of the electrical device through the discharge port of the first compartment wall. Since the setting of the flow guide extends the discharge path of the effluent, the temperature of the effluent gradually decreases during the process of passing through the flow guide, which helps to reduce the temperature of the effluent discharged into the external space, thereby reducing the risk of fire of the effluent. In addition, the flow guide is set between the first tank wall and the first compartment wall, which are opposite to each other along the first direction. On the one hand, it helps to improve the ease of installation of the flow guide and the battery device into the battery compartment, and on the other hand, it reduces the space occupied by the battery device in the direction perpendicular to the first direction.

[0069] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0070] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0071] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0072] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more individual battery cells housed within the battery case.

[0073] As an example, a battery cell assembly can be a battery module, which can be housed in a battery case by fixing the battery module in the battery case.

[0074] As an example, battery cell assemblies can also be housed in a battery box by directly fixing multiple battery cells to the battery box.

[0075] 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.

[0076] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0077] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the 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.

[0078] 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 at least one surface of the positive current collector.

[0079] 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.

[0080] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] As an example, the positive electrode active material may include at least one of the following materials: 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co1 / 3 Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0082] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0083] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0084] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0086] As an example, 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.

[0087] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least 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 at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of 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 battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0088] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not contain a negative electrode active material.

[0089] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0090] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0091] The technical solutions described in the embodiments of this application are applicable to electrical devices that use battery devices. The electrical devices include the battery devices of any embodiment of this application, and the battery devices are used to provide electrical energy.

[0092] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, aircraft, 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. Aircraft generally refer to machines that fly within the atmosphere or in outer space, including aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., 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, 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 application does not impose any special restrictions on the aforementioned electrical equipment.

[0093] It should be noted that the technical solutions described in the embodiments of this application are not limited to the electrical equipment described above, but can also be applied to all electrical equipment including battery devices and energy storage devices. However, for the sake of brevity, the following embodiments are all described using aircraft as an example.

[0094] Figure 1 A schematic diagram of the structure of an electrical device (aircraft) according to one or more embodiments; Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments.

[0095] Reference Figure 1 The aircraft 1000 typically includes a battery unit 100 and an airframe 200, with the battery unit 100 located in the airframe 200 and providing electrical power to the airframe 200.

[0096] like Figure 2 As shown, the battery device 100 includes a battery box 1 and at least one battery cell 2. The battery box 1 has a closed space, and the at least one battery cell 2 is housed in the closed space.

[0097] In some embodiments of this application, the battery box 1 may include a cover 12 and a body 11. The cover 12 and the body 11 are fastened together, forming a closed space inside the battery box 1 to accommodate the individual battery cells 2. Here, "closed" refers to covering or closing, and can be either sealed or unsealed.

[0098] The housing 11 can be a hollow structure with one open end, and the lid 12 can be a plate-like structure. The lid 12 closes onto the open side of the housing 11 so that the lid 12 and the housing 11 together define a closed space. Alternatively, both the lid 12 and the housing 11 can be hollow structures with one open end, with the open side of the lid 12 closing onto the open side of the housing 11. Of course, the battery box 1 formed by the lid 12 and the housing 11 can be of various shapes, such as a cylinder, a cuboid, etc.

[0099] In the battery device 100, there can be multiple battery cells 2, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 2 are connected in both series and parallel configurations. Multiple battery cells 2 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 2 is placed in the enclosed space formed by the housing 11 and the cover 12. Alternatively, the battery device 100 can also consist of multiple battery cells 2 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 then housed within the enclosed space formed by the housing 11 and the cover 12. 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 2.

[0100] In this embodiment, the battery cell 2 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.

[0101] The battery cell 2 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0102] As an example, the battery cell 2 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 application does not have any particular limitations.

[0103] Below, refer to Figures 3 to 8 Some embodiments of this application will be described in detail.

[0104] Figure 3 This is a schematic diagram of a battery device applied to an electrical device according to one or more embodiments; Figure 4 An exploded view of the battery device and the first bulkhead of the battery compartment according to one or more embodiments; Figure 5 This is a structural schematic diagram of a portion of a battery device according to one or more embodiments, illustrating the flow guide and the first seal; Figure 6This is a structural schematic diagram from another perspective of a portion of the structure of a battery device according to one or more embodiments, illustrating the flow guide and the first pressure relief mechanism; Figure 7 A cross-sectional view of a battery device according to one or more embodiments; Figure 8 This is an exploded perspective view of a battery cell according to one or more embodiments.

[0105] In some embodiments of this application, for ease of explanation, a first direction, a second direction, and a third direction are defined. These three directions intersect each other; here, intersecting each other includes perpendicularly intersecting each other. For ease of understanding of the embodiments of this application, in... Figures 2 to 8 In the illustrated embodiment, the example is given where the first direction, the second direction, and the third direction intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. For ease of explanation, as follows... Figures 2 to 8 As shown by the arrows in the diagram, the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction. Sometimes, the direction that arrow X points to along the first direction is called "above", and its opposite direction is called "below".

[0106] The first aspect of this application provides a battery device 100, such as Figure 3 and Figure 4 As shown, the battery device 100 is installed in the battery compartment 201 of the power-consuming device 200a and supplies power to the power-consuming device 200a. The first compartment wall 202 of the battery compartment 201 forms a discharge port 2021 that connects to the external space of the power-consuming device 200a. The battery device 100 includes a battery box 1, a flow guide 3, and a plurality of battery cells 2. The battery box 1 has a receiving cavity 10 for accommodating the battery cells 2. The first box wall 111 of the battery box 1 forms a pressure relief port 1111. The first box wall 111 and the first compartment wall 202 are opposite to each other along the first direction X and are spaced apart. The flow guide 3 is disposed between the first box wall 111 and the first compartment wall 202. The flow guide 3 has a flow channel that connects the pressure relief port 1111 and the discharge port 2021.

[0107] For example, the flow guide 3 is sealed to the first box wall 111, that is, the connection between the flow guide 3 and the first box wall 111 is sealed. The discharge from the pressure relief port 1111 can fully enter the flow channel of the flow guide 3 and be discharged to the external space of the electrical device 200a through the flow channel. During the discharge process, the discharge is not easy to escape into the battery compartment 201 through the connection between the flow guide 3 and the first box wall 111.

[0108] For example, the first box wall 111 is formed with a plurality of pressure relief ports 1111, and the flow guide 3 covers at least one pressure relief port 1111.

[0109] For example, such as Figure 4 As shown, the flow guide 3 includes a flow guide tube 31, which is a single tube that extends in a tortuous manner.

[0110] For example, the flow guide 3 includes a flow guide pipe body 31, which may include an input main pipe and multiple output branch pipes that are all connected to the input main pipe. The input main pipe is connected to the first box wall 111, and the output branch pipes are connected to the first bulkhead 202.

[0111] For example, the flow guide 3 includes a flow guide pipe body 31, which may include multiple input branch pipes and an output main pipe that is connected to the multiple input branch pipes. The input branch pipes are connected to the first box wall 111, and the output main pipe is connected to the first bulkhead 202.

[0112] For example, the first bulkhead 202 has a plurality of discharge ports 2021, and the deflector 3 covers at least one discharge port 2021.

[0113] In the embodiments of this application, by setting the guide member 3, in the event of thermal runaway of the battery cell 2, the effluent can enter the guide member 3 through the pressure relief port 1111 of the first housing wall 111, and under the guidance of the guide member 3, it is discharged into the external space of the electrical device 200a through the discharge port 2021 of the first compartment wall 202. Since the setting of the guide member 3 extends the discharge path of the effluent, the temperature of the effluent gradually decreases during the process of passing through the guide member 3, which is conducive to reducing the temperature of the effluent discharged into the external space, thereby reducing the risk of flammation of the effluent. In addition, the guide member 3 is set between the first housing wall 111 and the first compartment wall 202, which are opposite to each other along the first direction X. On the one hand, it is conducive to improving the convenience of installing the guide member 3 and the battery device 100 into the battery compartment 201, and on the other hand, it reduces the space occupied by the battery device 100 in the direction perpendicular to the first direction X.

[0114] In some embodiments, such as Figure 4 As shown, the flow guide 3 includes a flow guide tube 31 and a first connecting part 32 and a second connecting part 33 respectively connected to the two ends of the flow guide tube 31. The inner channel of the flow guide tube 31 is a flow guide channel. The first connecting part 32 is connected to the first box wall 111, and the second connecting part 33 is connected to the first bulkhead 202.

[0115] It is understood that the guide pipe body 31 is a tubular structure used to guide the discharge. The guide pipe body 31 can extend along a straight line, a curve, or a broken line, etc. The first connecting part 32 is the part of the guide member 3 that connects to the guide pipe body 31 and is used to connect to the first tank wall 111. For example, the first connecting part 32 is sealed to the first tank wall 111. The second connecting part 33 is the part of the guide member 3 that connects to the guide pipe body 31 and is used to connect to the first bulkhead 202. For example, the second connecting part 33 is sealed to the first bulkhead 202.

[0116] Optionally, the first connecting part 32 and the second connecting part 33 can be integrally formed with the guide tube body 31, or they can be formed separately and then connected, for example, by welding.

[0117] The connection between the first connecting part 32 and the first box wall 111 can be abutting, or it can be connected by fasteners, or it can be glued or welded, etc.

[0118] The connection between the second connecting part 33 and the first bulkhead 202 can be through abutment, fastener connection, bonding, or welding.

[0119] Thus, by setting the first connecting part 32 and the second connecting part 33, the flow guide 3 is respectively connected to the first box wall 111 and the first compartment wall 202, improving the connection reliability between the flow guide 3 and the battery box 1 and the battery compartment 201, thereby improving the flow guide effect of the flow guide 3 on the emission, and thus reducing the risk of fire in the battery device 100.

[0120] Of course, it is understood that the flow guide 3 is not limited to including the first connecting part 32 and the second connecting part 33. For example, the flow guide 3 is a flow guide tube 31. One end of the flow guide tube 31 is sealed and inserted into the pressure relief port 1111 and connected by an interference fit. The other end of the flow guide tube 31 passes through the discharge port 2021 through the first bulkhead 202 and extends outward.

[0121] In some embodiments, such as Figure 4 As shown, the first connecting part 32 is arranged around the outer peripheral surface of one end of the guide tube body 31 and abuts against the surface of the first box wall 111 facing the first compartment wall 202. The second connecting part 33 is arranged around the outer peripheral surface of the other end of the guide tube body 31 and contacts the surface of the first compartment wall 202 facing the first box wall 111 and is connected by fasteners.

[0122] For example, such as Figure 6 As shown, the second connecting part 33 has a plurality of connecting holes 331 extending along the first direction X. The plurality of connecting holes 331 are arranged sequentially at intervals along the circumference of the second connecting part 33. Fasteners connect the second connecting part 33 to the first bulkhead 202 through the connecting holes 331.

[0123] For example, the first connecting part 32 includes a sheet-like structure whose thickness direction is consistent with the first direction X. The first connecting part 32 abuts against the surface of the first box wall 111 facing the first bulkhead 202. It can be abutting only, or it can abut against and connect fasteners.

[0124] For example, the first connecting portion 32 surrounds the entire circumference of the guide tube body 31.

[0125] Optionally, the first connecting part 32 may surround half or three-quarters of the flow guide tube body 31.

[0126] For example, the second connecting part 33 includes a sheet-like structure whose thickness direction is consistent with the first direction X. The second connecting part 33 contacts the surface of the first bulkhead 202 facing the first box wall 111 and is connected by fasteners.

[0127] For example, the second connection portion 33 surrounds the entire circumference of the guide tube body 31.

[0128] Optionally, the second connecting part 33 may surround half or three-quarters of the flow guide tube body 31.

[0129] For example, multiple fasteners are provided, and the multiple fasteners are distributed sequentially at intervals along the circumferential edge of the second connection portion 33.

[0130] For example, fasteners include, but are not limited to, bolts, screws, washers, rivets, nuts, and other components.

[0131] For example, the first connection portion 32 surrounds the pressure relief port 1111 for an entire circumference.

[0132] For example, the second connection 33 surrounds the entire perimeter of the discharge port 2021.

[0133] In some embodiments, such as Figure 4 and Figure 5 As shown, the first connecting part 32 only abuts against the surface of the first housing wall 111 facing away from the receiving cavity 10. The second connecting part 33 is connected to the first compartment wall 202 by fasteners. A first sealing element 4 is sandwiched between the first connecting part 32 and the first housing wall 111. When the battery cell 2 experiences thermal runaway and ejection, the emissions are ejected from the pressure relief port 1111 of the first housing wall 111. During this process, the first housing wall 111 deforms towards the guide member 3 under the pressure of the emissions. In this way, the surfaces of the first housing wall 111 and the first connecting part 32 are pressed tightly together, and the first sealing element 4 is compressed, which improves the sealing effect of the first sealing element 4 and reduces the possibility of emissions overflowing into the battery compartment 201.

[0134] Thus, the first connecting part 32 is arranged around the guide tube body 31, which helps to increase the contact area between the first connecting part 32 and the first box wall 111, improve the connection reliability between the two, and also helps to improve the sealing performance at the connection point. This allows the space inside the guide tube 3 to form a negative oxygen environment, making it less likely for emissions to ignite when passing through this space. It also reduces the probability of emissions escaping into the battery compartment 201, reducing the impact of high-temperature emissions on the battery device 100 and the electrical device 200a, thereby improving the operational reliability of the battery device 100 and the electrical device 200a. Similarly, the second connecting part 33 is arranged around the guide tube body 31, which helps to increase the contact area between the second connecting part 33 and the first compartment wall 202, improve the connection reliability between the two, and also helps to improve the sealing performance at the connection point. This reduces the probability of emissions escaping into the battery compartment 201, reducing the impact of high-temperature emissions on the battery device 100 and the electrical device 200a, thereby improving the operational reliability of the battery device 100 and the electrical device 200a. In addition, the second connection part 33 is reliably connected to the first bulkhead 202 by fasteners, which improves the stability of the guide part 3 during the depressurization process and makes it less likely to fall off due to vibration or impact, thus further ensuring the integrity of the gas emission path.

[0135] Of course, it is understood that the connection between the second connecting part 33 and the first bulkhead 202 is not limited to using fasteners. In other embodiments, the connection between the second connecting part 33 and the first bulkhead 202 can be achieved by snap-fitting, bonding, welding, etc.

[0136] In some embodiments, such as Figure 5 As shown, the battery device 100 also includes a first sealing member 4, which is sandwiched between the first connecting part 32 and the first box wall 111 and is arranged around the pressure relief port 1111.

[0137] For example, the first seal 4 is a rubber seal, such as EPDM rubber, silicone rubber, nitrile rubber, fluororubber, etc.

[0138] For example, the first seal 4 is made of plastic, such as polytetrafluoroethylene, polyurethane, etc.

[0139] For example, the first seal 4 is formed by curing an adhesive, such as silicone sealant, polyurethane adhesive, anaerobic adhesive, etc.

[0140] Thus, by providing a first sealing element 4 between the first connecting part 32 and the first box wall 111, the sealing performance at the connection between the first connecting part 32 and the first box wall 111 can be improved, and the negative oxygen environment in the flow channel can be maintained, making it less likely for the exhaust to ignite when passing through this channel. In addition, the impact of leaked high-temperature gas on the battery device 100 and the electrical device 200a can be reduced, thereby improving the operational reliability of the battery device 100 and the electrical device 200a.

[0141] Of course, it is understood that the first connecting part 32 and the first box wall 111 are not limited to being provided with a seal. In other embodiments, the connection between the first connecting part 32 and the first box wall 111 may not be provided with a seal.

[0142] In some embodiments, such as Figure 5 As shown, a limiting groove is formed on the surface of the first connecting part 32 facing the first box wall 111. Part of the first sealing member 4 is disposed in the limiting groove, and the rest extends out of the limiting groove and abuts against the first box wall 111.

[0143] For example, the limiting groove can surround the entire circumference of one end opening of the guide tube body 31 connected to the first connecting part 32. It can also surround half a circumference or three-quarters of a circumference.

[0144] Thus, by setting the limiting groove, the limiting effect of the first seal 4 can be improved, allowing the first seal 4 to better perform its sealing effect, thereby maintaining a negative oxygen environment in the flow channel, making it less likely for the emitted material to ignite when passing through this channel, and reducing the impact of leaked high-temperature gas on the battery device 100 and the electrical device 200a, thereby improving the operational reliability of the battery device 100 and the electrical device 200a.

[0145] Of course, it is understandable that the first connecting portion 32 may not have a limiting groove. In some embodiments, a groove for limiting the first sealing ring may be provided on the surface of the first housing wall 111. In some embodiments, neither the first connecting portion 32 nor the first housing wall 111 may have a groove for limiting the first sealing ring.

[0146] In some embodiments, such as Figure 4 As shown, the battery device 100 also includes a first pressure relief mechanism 5. The first pressure relief mechanism 5 is located at one end of the guide tube body 31 that connects to the second connection part 33. The first pressure relief mechanism 5 is connected to the second connection part 33 and extends out of the external space through the discharge port 2021.

[0147] The first pressure relief mechanism 5 is used to discharge gas from the guide tube 31. As an example, the first pressure relief mechanism 5 is actuated to release pressure or temperature when the internal pressure or temperature of the guide tube 31 reaches a predetermined threshold. When the pressure or temperature inside the guide tube 31 reaches the predetermined threshold, the first pressure relief mechanism 5 performs its action, or a weak structure provided in the first pressure relief mechanism 5 is destroyed, thereby forming an opening or channel for the pressure or temperature inside the guide tube 31 to be released. This threshold design varies depending on the design requirements.

[0148] The term "actuation" as used in this application refers to the first pressure relief mechanism 5 being activated or undergoing a certain state, thereby allowing the pressure and temperature inside the battery box 1 to be released. The actions of the first pressure relief mechanism 5 may include, but are not limited to: movement of components within the first pressure relief mechanism 5 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the first pressure relief mechanism 5, etc. When the first pressure relief mechanism 5 is activated, the high-temperature, high-pressure substances inside the battery box 1 are discharged as waste through the guide pipe 31 and outwards from the activated portion. This method enables pressure and temperature relief in the battery box 1 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0149] For example, the first pressure relief mechanism 5 is fixed to the surface of the second connection portion 33 facing the first bulkhead 202 by fasteners, and the first pressure relief mechanism 5 closes the opening at one end of the guide tube body 31 connected to the second connection portion 33 when it is not actuated, and the opening is opened when the first pressure relief mechanism 5 is actuated.

[0150] For example, the first pressure relief mechanism 5 is connected to the second connection part 33 by fasteners, including bolts and nuts.

[0151] Thus, by providing a first pressure relief mechanism 5 at the outlet of the guide tube 31, the guide tube 31 can be opened to discharge emissions in the event of thermal runaway of the battery device 100. Under normal conditions, the outlet of the guide tube 31 is sealed by the first pressure relief mechanism 5, reducing the probability of foreign objects such as dust particles from the external space entering the guide tube 31 and entering the battery compartment 1 through the guide tube 31, thereby reducing the impact of foreign objects entering the battery device 100 and the operation of the guide tube 31. In addition, since part of the first pressure relief mechanism 5 extends into the external space through the discharge port 2021, the emissions discharged from the first pressure relief mechanism 5 directly enter the external space, making it difficult for the emissions to enter the battery compartment 201, thereby reducing the possibility of damage to the battery device 100.

[0152] Of course, it is understandable that the guide tube body 31 may not be provided with a pressure relief mechanism. In some embodiments, the opening at one end of the guide tube body 31 that connects to the second connecting part 33 is not provided with a pressure relief mechanism.

[0153] In some embodiments, the battery device 100 further includes a second seal (not shown) sandwiched between the second connection portion 33 and the first bulkhead 202, and disposed around the discharge port 2021.

[0154] For example, the second seal is made of rubber, such as EPDM rubber, silicone rubber, nitrile rubber, fluororubber, etc.

[0155] For example, the second seal is made of plastic, such as polytetrafluoroethylene, polyurethane, etc.

[0156] For example, the second seal is formed by curing an adhesive, such as silicone sealant, polyurethane adhesive, anaerobic adhesive, etc.

[0157] Thus, by providing a second seal between the second connection part 33 and the first bulkhead 202, the sealing performance at the connection between the second connection part 33 and the first bulkhead 202 can be improved, and the impact of leaked high-temperature gas on the battery device 100 and the electrical device 200a can be reduced, thereby improving the operational reliability of the battery device 100 and the electrical device 200a.

[0158] Of course, it is understood that the second connecting part 33 and the first bulkhead 202 are not limited to being provided with a seal. In other embodiments, the connection between the second connecting part 33 and the first bulkhead 202 may not be provided with a seal.

[0159] In some embodiments, such as Figure 4 As shown, the flow guide 3 includes a flow guide tube 31, which extends along a tortuous direction.

[0160] For example, the extension direction of the guide tube 31 may include an arc direction, a zigzag direction, etc.

[0161] This design makes the guide pipe 31 a tortuous shape, allowing for a longer guide pipe 31 to be accommodated within a certain space. This facilitates extending the exhaust path, further reducing the temperature of the exhaust gases discharged through the exhaust port 2021, and further reducing the risk of the exhaust gases igniting.

[0162] Of course, it is understood that the guide tube 31 is not limited to extending in a tortuous direction. In some embodiments, the guide tube 31 can extend in a straight direction, which can be inclined relative to the first direction X, thus also helping to extend the discharge path.

[0163] In some embodiments, such as Figure 4 and Figure 5As shown, the guide pipe body 31 includes at least one straight pipe section 3111 and at least one bent pipe section 3112, with the straight pipe section 3111 and the bent pipe section 3112 connected and communicating with each other.

[0164] Optionally, the bending angle of the bend section 3112 can be a right angle, an obtuse angle, or an acute angle.

[0165] Thus, by setting the bend section 3112, the guide pipe body 31 becomes a tortuous shape, which is more conducive to extending the exhaust path. By setting the combination of the straight pipe section 3111 and the bend section 3112, a longer guide pipe body 31 can be accommodated within a certain space, and the straight pipe section 3111 facilitates the smoothness of emission. In addition, the setting of the bend section 3112 facilitates the adsorption of high-temperature combustible particles in the emission at the bend section 3112, further reducing the risk of fire of the emitted emission.

[0166] In some embodiments, such as Figure 4 and Figure 5 As shown, the flow guide 3 includes a flow guide pipe body 31, which includes a main pipe section 311 and a first variable diameter pipe section 312 and a second variable diameter pipe section 313 connected to the two ends of the main pipe section 311 respectively. The maximum flow area of ​​the main pipe section 311 is not greater than the minimum flow area of ​​the first variable diameter pipe section 312 and not greater than the minimum flow area of ​​the second variable diameter pipe section 313. Along the flow direction of the flow guide pipe body 31, the first variable diameter pipe section 312 is located between the pressure relief port 1111 and the main pipe section 311, and the second variable diameter pipe section 313 is located between the main pipe section 311 and the discharge port 2021. From the pressure relief port 1111 to the main pipe section 311, the flow area of ​​the first variable diameter pipe section 312 gradually decreases, and from the main pipe section 311 to the discharge port 2021, the flow area of ​​the first variable diameter pipe section 312 gradually increases.

[0167] For example, the flow area at various points in the main pipe section 311 may be the same or different.

[0168] Thus, the large flow area at the end of the first reducing pipe section 312 furthest from the main pipe section 311 allows it to cover the pressure relief port 1111 of the battery box 1, facilitating the more thorough introduction of emissions from the pressure relief port 1111 into the guide pipe body 31. Similarly, the large flow area at the end of the second reducing pipe section 313 furthest from the main pipe section 311 allows it to cover the discharge port 2021 of the first bulkhead 202, reducing the possibility of emissions escaping into the battery compartment 201 and minimizing the impact of high-temperature emissions on the battery device 100 and the electrical device 200a, thereby improving the operational reliability of the battery device 100 and the electrical device 200a. Furthermore, by setting a relatively small flow area for the main pipe section 311, space is saved, and a longer flow path can be provided within a given space, further reducing the temperature of emissions discharged through the discharge port 2021 and further reducing the risk of emissions ignition.

[0169] Of course, it is understood that the structure of the flow guide tube 31 is not limited to this. In some embodiments, the flow guide tube 31 can be configured as a tube with the same flow area everywhere.

[0170] In some embodiments, such as Figure 5 and Figure 6 As shown, the main pipe section 311 includes multiple straight pipe sections 3111 and at least one bent pipe section 3112. The multiple straight pipe sections 3111 are arranged in a staggered manner, and adjacent straight pipe sections 3111 are connected and communicated with each other through bent pipe sections 3112; and / or, the first reducing pipe section 312 is connected and communicated with the straight pipe section 3111 through bent pipe section 3112; and / or, the second reducing pipe section 313 is connected and communicated with the straight pipe section 3111 through bent pipe section 3112.

[0171] Thus, the bend section 3112 can be formed at both ends of the main pipe section 311 or in the middle of the main pipe section 311. By connecting the bend section 3112 between adjacent straight pipe sections 3111, and / or between the first reducing pipe section 312 and the straight pipe section 3111, and / or between the second reducing pipe section 313 and the straight pipe section 3111, the extension direction is changed by the bend section 3112, reducing the space occupied in the same straight direction. Therefore, within a certain space, a guide pipe body 31 with a longer flow path can be accommodated, which is conducive to further reducing the temperature of the emissions discharged through the discharge port 2021 and further reducing the risk of emissions ignition.

[0172] In some embodiments, such as Figure 5 and Figure 6As shown, multiple straight pipe sections 3111 include a first straight pipe section 3111a, a second straight pipe section 3111b, and a third straight pipe section 3111c. At least one bent pipe section 3112 includes a first bent pipe section 3112a, a second bent pipe section 3112b, and a third bent pipe section 3112c. The first straight pipe section 3111a extends along the second direction Y, with one end connected and communicating with the first reducing pipe section 312, and the other end connected and communicating with the second straight pipe section 3111b via the first bent pipe section 3112a. The second straight pipe section 3111b... Extending along the third direction Z, the end of the pipe segment 3112a away from the first bend section 3112a is connected to and communicates with the third straight pipe segment 3111c via the second bend section 3112b. The third straight pipe segment 3111c extends along the second direction Y and is located on the same side of the second straight pipe segment 3111b along the second direction Y. The end of the third straight pipe segment 3111c away from the second bend section 3112b is connected to and communicates with the second reducing pipe segment 313 via the third bend section 3112c. The second direction Y, the third direction Z, and the first direction X intersect each other.

[0173] For example, the flow area of ​​each straight pipe section 3111 and each bend pipe section 3112 of the main pipe section 311 is the same.

[0174] For example, at least two straight pipe sections 3111 have different flow areas.

[0175] For example, at least two bends 3112 have different flow areas.

[0176] For example, at least one straight pipe section 3111 has a different flow area than at least one bend pipe section 3112.

[0177] This configuration results in a relatively long flow channel in the flow direction of the formed guide pipe 31, which helps to reduce the temperature of the emissions discharged through the discharge port 2021, further reducing the risk of emissions ignition. Furthermore, most of the pipe section of the guide pipe 31 extends in the second direction Y and the third direction Z, occupying less space in the first direction X. This helps to reduce the volume of the battery compartment 201, facilitates the miniaturization of the electrical device 200a, and allows for the accommodation of more battery devices 100 within a given battery compartment 201 volume.

[0178] In some embodiments, such as Figure 5 As shown, the second variable diameter pipe section 313 extends along the first direction X, one end of the third bend pipe section 3112c is connected to the third straight pipe section 3111c, and the other end bends toward the first bulkhead 202 and is connected and communicates with the second variable diameter pipe section 313.

[0179] For example, the cross-section of the flow channel of the second variable diameter pipe section 313 can be a regular or irregular shape such as a circle, square, or pentagon.

[0180] For example, the cross-section of the flow channel of the first variable diameter pipe section 312 can be a regular or irregular shape such as rectangle, circle, ellipse, square, pentagon, etc.

[0181] For example, the cross-section of the flow channel of the main pipe section 311 can be a regular or irregular shape such as a square, rectangle, circle, ellipse, or pentagon.

[0182] Thus, by setting the extension direction of the second variable diameter pipe section 313 to be consistent with the first direction X, so that the large opening of the second variable diameter pipe section 313 is directly opposite the discharge port 2021 of the first bulkhead 202, the discharged material can flow smoothly through the second variable diameter pipe section 313 to the discharge port 2021 and be discharged into the external space through the discharge port 2021.

[0183] Of course, the extension direction of the second variable diameter pipe section 313 is not limited to the first direction X. In some embodiments, the extension direction of the second variable diameter pipe section 313 may be consistent with the second direction Y or the third direction Z.

[0184] In some embodiments, such as Figure 5 and Figure 6 As shown, the first variable diameter pipe section 312 extends along the second direction Y. The guide pipe body 31 also includes a connecting bend 314. One end of the connecting bend 314 is connected to and communicates with the first variable diameter pipe section 312, and the other end is bent toward the first box wall 111 and communicates with the pressure relief port 1111.

[0185] For example, the cross-section of the channel in the first reducing pipe section 312 is rectangular, with the length direction of the rectangle aligned with the third direction Z and the width direction aligned with the first direction X. This reduces the space occupied in the first direction X when the cross-sectional area of ​​the channel is constant.

[0186] For example, the dimension of the first reducing pipe section 312 along its extension direction is greater than the dimension of the second reducing pipe section 313 along its extension direction.

[0187] Thus, by extending the first variable diameter pipe section 312 along the second direction Y, the size of the first variable diameter pipe section 312 along its extension direction can be set to be relatively large, so that the inclination of the inclined inner wall of the first variable diameter pipe section 312 is relatively small, reducing the vortex dead zone caused by sudden contraction, improving the smoothness of discharge, and also helping to reduce the impact force of the discharge on the inclined inner wall, which helps to improve the structural and positional stability of the guide 3, so that the guide 3 can better play its guiding role.

[0188] In some embodiments, such as Figure 5 and Figure 6As shown, the flow guide 3 also includes a first connecting part 32, which is connected to and surrounds the connecting bend 314. The first connecting part 32 abuts against the surface of the first box wall 111 facing the first bulkhead 202.

[0189] Thus, the first connecting part 32 is arranged around the connecting bend 314, which helps to increase the contact area between the first connecting part 32 and the first box wall 111, improve the connection reliability between the two, and also helps to improve the sealing performance at the connection between the two. This allows the space inside the guide 3 to form a negative oxygen environment, making it less likely for the exhaust to ignite when passing through this space. It also reduces the probability of the exhaust escaping into the battery compartment 201, reduces the impact of high-temperature exhaust on the battery device 100 and the electrical device 200a, thereby improving the operational reliability of the battery device 100 and the electrical device 200a.

[0190] In some embodiments, such as Figure 5 and Figure 6 As shown, the flow guide 3 also includes a second connecting part 33, which is connected to and surrounds the second variable diameter pipe section 313. The second connecting part 33 abuts against the surface of the first bulkhead 202 facing the first box wall 111 and is connected by fasteners.

[0191] The second connecting part 33 is arranged around the second variable diameter pipe section 313, which helps to increase the contact area between the second connecting part 33 and the first bulkhead 202, improve the connection reliability between the two, and also helps to improve the sealing performance at the connection, reduce the probability of emissions escaping into the battery compartment 201, reduce the impact of high temperature emissions on the battery device 100 and the electrical device 200a, thereby improving the operational reliability of the battery device 100 and the electrical device 200a.

[0192] In some embodiments, such as Figure 3 and Figure 4 As shown, the first box wall 111 is the bottom wall of the battery box 1, and the first compartment wall 202 is the bottom wall of the battery compartment 201.

[0193] For example, the battery compartment 201 is located at the bottom of the electrical device 200a.

[0194] It is understandable that "the first box wall 111 is the bottom wall of the battery box 1" means that, in the working state of the battery device 100, the lowest box wall of the battery box 1 located in the direction of gravity is the first box wall 111, and "the first compartment wall 202 is the bottom wall of the battery compartment 201" means that, in the working state of the power-consuming device 200a, the lowest compartment wall located in the direction of gravity among all the compartment walls surrounding the battery compartment 201 is the first compartment wall 202. The battery device 100 is located inside the battery receiving cavity 10; therefore, the first compartment wall 202 is located below the first box wall 111. Here, "below" can mean directly below along the direction of gravity or diagonally below.

[0195] In this way, by spraying the emissions downwards, the impact on the portion of the electrical device 200a located above the battery compartment 201 is reduced, significantly reducing damage to the electrical device 200a and the passenger compartment located above the battery compartment 201.

[0196] Of course, it is understood that the first enclosure wall 111 is not limited to the bottom wall of the battery box 1, and the first compartment wall 202 is not limited to the bottom wall of the battery compartment 201. In some embodiments, the first enclosure wall 111 can be the top wall of the battery box 1, and the first compartment wall 202 can be the top wall of the battery compartment 201. In some embodiments, the first enclosure wall 111 can be the side wall of the battery box 1 facing its horizontal direction, and the first compartment wall 202 can be the side wall of the battery compartment 201 facing its horizontal direction.

[0197] In some embodiments, such as Figure 7 and Figure 8 As shown, the battery cell 2 includes an electrode assembly 22, which includes a positive electrode sheet, which includes a positive electrode active material. The positive electrode active material is lithium nickel cobalt manganese oxide, wherein the molar content of nickel is more than 90%, and the length of the current guiding channel along its flow direction is greater than or equal to 400 mm and less than or equal to 900 mm.

[0198] It should be noted that "the length of the guide channel along its flow direction" refers to the length of the shortest path from the inlet to the outlet of the guide channel.

[0199] For example, the length of the flow channel along its flow direction can be, but is not limited to, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm or any data between any two of these.

[0200] Thus, the battery cell 2 has a high energy density, and when thermal runaway occurs and it erupts, it is easy to produce more emissions. The flow guide 3, which is adapted to it with a flow channel length of greater than or equal to 400 mm and less than or equal to 900 mm, can greatly reduce the temperature of the emissions into the external space, thereby reducing the risk of emissions igniting.

[0201] In some embodiments, the electrode assembly 22 further includes a negative electrode sheet, which includes a negative electrode active material, which includes graphite and silicon-based material, wherein the silicon-based material accounts for 5% of the total mass of the negative electrode active material, and the length of the flow channel along its flow direction is greater than or equal to 400 mm and less than or equal to 600 mm.

[0202] For example, this battery device 100 can be applied to an unmanned aerial vehicle 1000.

[0203] For example, the length of the flow channel along its flow direction can be, but is not limited to, 400mm, 450mm, 500mm, 550mm, 600mm or any data between any two of these.

[0204] Thus, the emissions generated by the battery device 100 can be discharged through the guide member 3 with a length of 400 mm or more and less than or equal to 600 mm. This length of guide member 3 can meet the cooling requirements of the emissions and prevent them from catching fire. It also reduces the problem of large space occupation due to the excessive length of the guide member 3.

[0205] In some embodiments, the electrode assembly 22 further includes a negative electrode sheet, which includes a negative electrode active material, which includes graphite and silicon-based materials. The silicon-based material accounts for 40% of the total mass of the negative electrode active material, and the length of the flow channel along its flow direction is greater than or equal to 700 mm and less than or equal to 900 mm.

[0206] For example, this battery device 100 can be applied to a manned aircraft 1000.

[0207] For example, the length of the flow channel along its flow direction can be, but is not limited to, 700mm, 750mm, 800mm, 850mm, 900mm or any data between any two of these.

[0208] Thus, the emissions generated by the battery device 100 can be discharged through the guide member 3 with a length of 700 mm or more and 900 mm or less. This length of guide member 3 can meet the cooling requirements of the emissions and prevent them from catching fire. It also reduces the problem of large space occupation due to the excessive length of the guide member 3.

[0209] In some embodiments, such as Figure 6 As shown, a filter screen and / or a first pressure relief mechanism 5 are provided at one end of the guide member 3 near the discharge port 2021.

[0210] The filter screen filters out larger particles in the emissions, retaining larger flammable particles in a negative oxygen environment to reduce the risk of flammable particles igniting, while releasing smaller, non-flammable particles and gases into the external space, reducing the risk of emissions igniting in the external space. The first pressure relief mechanism 5 allows the guide pipe 31 to open in the event of thermal runaway of the battery device 100, allowing emissions to be discharged. Under normal conditions, the outlet of the guide pipe 31 is sealed by the first pressure relief mechanism 5, reducing the probability of dust particles and other foreign objects from the external space entering the guide pipe 31 and the battery box 1 through it, thereby reducing the impact of foreign objects on the operation of the battery device 100 and the guide pipe 31.

[0211] In some embodiments, such as Figure 2 and Figure 7 As shown, the battery box 1 includes a box body 11 and a box cover 12. The box cover 12 is fastened to the box body 11 along the first direction X, forming a receiving cavity 10 between them. The box body 11 includes a support wall 112 and a first box wall 111. The support wall 112 supports the battery cell 2 from one side of the first direction X. The first box wall 111 is located on the side of the support wall 112 facing away from the battery cell 2 along the first direction X, and forms a pressure relief cavity 20 between the support wall 112 and the support wall 112. The support wall 112 has a vent hole 1121 that runs through the first direction X. The vent hole 1121 is closed by a sealing member 113. When the pressure or temperature on the sealing member 113 reaches a predetermined threshold, the vent hole 1121 opens.

[0212] For example, there are multiple vent holes 1121, with each battery cell 2 corresponding to one vent hole 1121. The emissions discharged from the battery cell 2 are sprayed into the corresponding vent hole 1121 and enter the pressure relief chamber 20 through the vent hole 1121, and then discharged to the external space through the guide 3.

[0213] For example, the pressure relief port 1111 can be provided with one, two, three, four or more.

[0214] Thus, by forming the pressure relief chamber 20, the emissions from multiple battery cells 2 can be collected in the pressure relief chamber 20 and then discharged through the guide member 3. On the one hand, the setting of the pressure relief chamber 20 can further extend the discharge path of the emissions, which helps to reduce the temperature of the emissions discharged through the discharge port 2021 and further reduces the risk of emissions ignition. On the other hand, the pressure relief chamber 20 is used to collect the emissions from each battery cell 2, so that a smaller number of pressure relief ports 1111 can be set in the first box wall 111, and only one or a small number of guide members 3 are needed for discharge, which helps to simplify the structure of the battery device 100.

[0215] In some embodiments, such as Figure 8 As shown, the battery cell 2 includes a housing 21, a second pressure relief mechanism 23 disposed on the housing 21, and an electrode assembly 22 housed in the housing 21. The battery cell 2 is disposed in the housing cavity 10 with the second pressure relief mechanism 23 facing the support wall 112, and the second pressure relief mechanism 23 and the vent 1121 are disposed opposite to each other along the first direction X.

[0216] The outer casing 21 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc. In some embodiments, the outer casing 21 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 21 is a non-sealed structure, it serves to protect the electrode assembly 22, and a sealing bag is also included between the outer casing 21 and the electrode assembly 22. The sealing bag is used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 21 is a sealed structure, it is used to encapsulate the electrode assembly 22 and electrolyte components.

[0217] For example, such as Figure 8 As shown, the outer casing 21 includes an end cap 212 and a housing 211. The housing 211 has an opening, and the end cap 212 covers the opening. The housing 211 may have one or more openings. The end cap 212 may also have one or more. For example, a second pressure relief mechanism 23 is provided on the end cap 212 and / or the housing 211.

[0218] The second pressure relief mechanism 23 is used to release internal gas from the battery cell 2. As an example, it is actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 2 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 2 reaches the predetermined threshold, the second pressure relief mechanism 23 either actuates or a weak structure within the second pressure relief mechanism 23 is damaged, thereby forming an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 2.

[0219] As an example, the second pressure relief mechanism 23 can be integrally formed with the housing 21.

[0220] As an example, the second pressure relief mechanism 23 can also be separately configured and connected to the housing 21.

[0221] The term "actuation" as used in this application refers to the second pressure relief mechanism 23 being activated or reaching a certain state, thereby releasing the internal pressure and temperature of the battery cell 2. The actions of the second pressure relief mechanism 23 may include, but are not limited to: movement of components within the second pressure relief mechanism 23 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the second pressure relief mechanism 23, etc. When the second pressure relief mechanism 23 is activated, the high-temperature, high-pressure substances inside the battery cell 2 are discharged outwards from the activated portion as exhaust materials. This method enables pressure and temperature relief of the battery cell 2 under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0222] With this configuration, during the thermal runaway of battery cell 2, the emissions released by battery cell 2 directly enter the pressure relief chamber 20 through the vent 1121, thereby improving the thermal runaway protection efficiency.

[0223] Of course, it is understood that the arrangement of the battery cell 2 within the receiving cavity 10 is not limited to the second pressure relief mechanism 23 facing the support wall 112. In some other embodiments, the second pressure relief mechanism 23 of the battery cell 2 may face the top wall of the cover 12 opposite to the support wall 112 along the first direction X, or any side wall of the battery box 1 connected between the support wall 112 and the top wall.

[0224] In some embodiments, one second pressure relief mechanism 23 may correspond to one vent 1121, or multiple second pressure relief mechanisms 23 may share one vent 1121. In a specific embodiment, the second pressure relief mechanisms 23 of battery cells 2 arranged along the second direction Y share one vent 1121.

[0225] In some embodiments, such as Figure 4 As shown, the first box wall 111 has multiple pressure relief ports 1111, and multiple flow guides 3 are provided, each flow guide 3 being connected to at least one pressure relief port 1111.

[0226] For example, the first box wall 111 has four pressure relief ports 1111, which are located at the four corners of a rectangle. There are four flow guides 3, and the four flow guides 3 are arranged in a one-to-one correspondence with the four pressure relief ports 1111.

[0227] Optionally, one flow guide 3 can correspond to two or more pressure relief ports 1111.

[0228] For example, the first bulkhead 202 has four discharge ports 2021, and the four discharge ports 2021 are configured in a one-to-one correspondence with four flow guides 3.

[0229] Thus, by setting multiple pressure relief ports 1111 and multiple flow guides 3, the exhaust efficiency can be improved and the risk of battery device 100 exploding can be reduced.

[0230] In some embodiments, the guide element 3 is made of titanium alloy.

[0231] Thus, using titanium alloy as the material for the flow guide 3 allows it to withstand higher temperatures, improving its high-temperature resistance and reducing the likelihood of high-temperature gases melting through the structure. Furthermore, titanium alloy's low density and high strength help reduce overall weight, making it suitable for weight-sensitive applications such as aircraft 1000.

[0232] Of course, it is understood that the flow guide 3 is not limited to being made of titanium alloy. In other embodiments, the flow guide 3 is made of aluminum alloy or other materials.

[0233] The second aspect of this application provides an electrical appliance, such as Figure 3 As shown, the electrical equipment includes an electrical device 200a and a battery device 100. The electrical device 200a has a battery receiving cavity 10; the battery device 100 is disposed in the battery receiving cavity 10.

[0234] Because the electrical device includes a battery device 100, and because the electrical device includes all the beneficial effects of the battery device 100, the electrical device is able to reduce the risk of fire in the event of thermal runaway.

[0235] In some embodiments, such as Figure 1 As shown, the electrical equipment includes an aircraft 1000, which includes a battery device 100 and a body 200 as an electrical device 200a.

[0236] Aircraft 1000 generally refers to a device that flies 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, it can be a low-altitude aircraft 1000, an eVTOL (electric vertical take-off and landing) aircraft 1000, a commuter aircraft, a regional jet, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. For example, aircraft 1000 is a cargo drone.

[0237] Therefore, the risk of the aircraft 1000 catching fire in the event of thermal runaway is low.

[0238] In some embodiments, such as Figure 3As shown, the body 200 has a battery compartment 201, in which a battery device 100 is installed. The battery compartment 201 has a first compartment wall 202 that supports the battery device 100 from below. The first compartment wall 202 has an outlet 2021 that communicates with the external space.

[0239] In this way, the battery device 100 in the aircraft 1000 discharges emissions from below the battery compartment 201 through the guide 3, reducing the possibility of emissions escaping into the interior of the aircraft 1000 and improving the reliability of the aircraft 1000 operation.

[0240] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0241] As a specific example, a battery pack thermal runaway flue structure (heat-conducting component) is provided. The flue structure consists of three parts: a first flange structure (first connecting part 32), a second flange structure (second connecting part 33), and a main structure (guide tube body 31). The flange face of the first flange structure (the surface of the first connecting part 32 facing the first housing wall 111) has a sealing groove (limiting groove), and a sealing gasket (first sealing element 4) is disposed in the sealing groove. The second flange structure has a mounting hole (connection hole 331), and an explosion-proof valve (first pressure relief mechanism 5) is connected to the mounting hole of the second flange structure by nuts and bolts. The main structure consists of four pipe sections. The first section is a connecting section (connecting bend 314) that connects to the pressure relief port 1111 of the battery box 1. This connecting section has a 90° corner structure. The second section is a first variable cross-section section (first variable diameter pipe section 312), which is used to change the large cross-section at the pressure relief port 1111 to a small cross-section, thus saving space and extending the path. The third section is a constant cross-section section (main pipe section 311), which includes three 90° corner structures: the first corner (first bend pipe section 3112a), the second corner (second bend pipe section 3112b), and the third corner (third bend pipe section 3112c). The last section is a second variable cross-section section (second variable diameter pipe section 313), which transitions the area of ​​the constant cross-section section to the exhaust area corresponding to the discharge port 2021.

[0242] When a battery cell (cell 2) experiences thermal runaway, the cell's explosion-proof valve (second pressure relief mechanism 23) opens, and high-temperature gas and high-temperature combustible particles are ejected from the pressure relief port 1111 of the battery pack bottom plate (first casing wall 111). The battery pack bottom plate deforms towards the thermal runaway flue due to the pressure of the thermal runaway gas. Due to the support of the flange face of the first flange structure of the thermal runaway flue, the battery pack bottom plate is flush with the flange face, and the gasket is compressed. The thermal runaway gas is blocked by the gasket and cannot overflow into the battery compartment (battery compartment 201). After entering the thermal runaway flue structure through the pressure relief port 1111, the thermal runaway gas and high-temperature combustible particles pass through a 90° bend structure (connecting bend 314). Some of the high-temperature combustible particles are adsorbed at this bend structure, while the remaining high-temperature gas and combustible particles enter the first variable cross-section section and the constant cross-section section, respectively. After entering the constant cross-section section, the high-temperature combustible particles enter the first bend, where some are adsorbed. The remaining high-temperature gas and high-temperature combustibles pass through the second and third corners in sequence. After passing through three 90° corners, the high-temperature combustible particles are further adsorbed and finally enter the second variable cross-section section. At the second flange structure, the last remaining high-temperature combustible particles are blocked and filtered by the explosion-proof valve, leaving only high-temperature gas to be discharged from the emission port 2021.

[0243] For the ternary battery cell with 9-series + 5%Si (silicon-based materials account for 5% of the total mass of the negative electrode active materials), high-temperature gas is discharged from the pressure relief port 1111. The high-temperature gas at 900℃-1100℃ passes through the first flange structure, connecting bend 314, first variable cross-section section, constant cross-section section, second variable cross-section section, and second flange structure. After passing through a 400mm-600mm long flue path, the high-temperature gas is cooled by the flue. After reaching the discharge port 2021, the temperature is greatly reduced to 500℃-600℃. At this time, the high-temperature gas will not be ignited by the external environment, meeting the requirement of no open flame.

[0244] For the ternary battery cell with 9-series + 40% Si (silicon-based materials account for 40% of the total mass of the negative electrode active material), high-temperature gas is discharged from the pressure relief port 1111 at a temperature of 1200℃-1600℃. After passing through the first flange structure, connecting bend 314, first variable cross-section section, constant cross-section section, second variable cross-section section, and second flange structure, the high-temperature gas passes through a 700mm-900mm long flue path. The high-temperature gas is cooled by the flue, and its temperature is greatly reduced to 500℃-600℃ after reaching the discharge port 2021. At this time, the high-temperature gas will not be ignited by the external environment, meeting the requirement of no open flame.

[0245] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery device, characterized by, The battery compartment is designed for installation within an electrical device and for supplying power to the device. The first wall of the battery compartment has a discharge port that connects to the external space of the electrical device. The battery device includes: Multiple battery cells; A battery box has a cavity for accommodating the battery cells. A pressure relief port is formed on the first wall of the battery box. The first wall and the first compartment wall are opposite to each other in a first direction and are spaced apart. A flow guide is disposed between the first tank wall and the first bulkhead. The flow guide has a flow channel that connects the pressure relief port and the discharge port. The first box wall is the bottom wall of the battery box, and the first compartment wall is the bottom wall of the battery compartment.

2. The battery device according to claim 1, characterized by The flow guide includes a flow guide tube body and a first connecting part and a second connecting part respectively connected to both ends of the flow guide tube body. The internal channel of the flow guide tube body is the flow guide channel. The first connecting part is connected to the first tank wall, and the second connecting part is used to connect to the first bulkhead.

3. The battery device according to claim 2, characterized in that, The first connecting portion is disposed around the outer peripheral surface of one end of the guide tube body and abuts against the surface of the first box wall facing the first compartment wall. The second connecting portion surrounds the outer peripheral surface of the other end of the guide tube body and is used to contact the surface of the first bulkhead facing the first box wall and be connected by fasteners.

4. The battery device according to claim 2, characterized in that, The battery device further includes a first seal, which is sandwiched between the first connecting portion and the first casing wall and is arranged around the pressure relief port.

5. The battery device according to claim 4, characterized in that, A limiting groove is formed on the surface of the first connecting part facing the first box wall. A portion of the first sealing member is disposed in the limiting groove, and the remaining portion extends out of the limiting groove and abuts against the first box wall.

6. The battery device according to any one of claims 2 to 5, characterized in that, The battery device further includes a first pressure relief mechanism, which is located at one end of the guide tube body that connects to the second connection part. The first pressure relief mechanism is connected to the second connection part and extends into the external space through the discharge port.

7. The battery device according to any one of claims 2 to 5, characterized in that, The battery device further includes a second seal, which is sandwiched between the second connection and the first bulkhead and is disposed around the discharge port.

8. The battery device according to any one of claims 1 to 5, characterized in that, The flow guide includes a flow guide tube that extends along a tortuous direction.

9. The battery device according to claim 8, characterized in that, The guide pipe includes at least one straight pipe section and at least one curved pipe section, wherein the straight pipe section and the curved pipe section are connected and communicate with each other.

10. The battery device according to any one of claims 1 to 5 and 9, characterized in that, The flow guiding component includes a flow guiding pipe body, which comprises a main pipe section and a first reducing pipe section and a second reducing pipe section respectively connected to both ends of the main pipe section. The maximum flow area of ​​the main pipe section is not greater than the minimum flow area of ​​the first reducing pipe section, and is not greater than the minimum flow area of ​​the second reducing pipe section. Along the flow direction of the guide pipe, the first reducing pipe section is located between the pressure relief port and the main pipe section, and the second reducing pipe section is located between the main pipe section and the discharge port. From the pressure relief port to the main pipe section, the flow area of ​​the first reducing pipe section gradually decreases. From the main pipe section to the discharge port, the flow area of ​​the first variable diameter pipe section gradually increases.

11. The battery device according to claim 10, characterized in that, The main pipe section includes multiple straight pipe sections and at least one bent pipe section, with the multiple straight pipe sections arranged alternately. Adjacent straight pipe sections are connected and communicated via the bends; and / or The first reducing pipe section is connected and communicated with the straight pipe section via a bend; and / or The second reducing pipe section is connected to the straight pipe section via a bend.

12. The battery device according to claim 11, characterized in that, The plurality of straight pipe sections include a first straight pipe section, a second straight pipe section, and a third straight pipe section, and the at least one bent pipe section includes a first bent pipe section, a second bent pipe section, and a third bent pipe section. The first straight pipe section extends along the second direction, with one end connected to and communicating with the first reducing pipe section, and the other end connected to and communicating with the second straight pipe section through the first bend. The second straight pipe section extends along the third direction, with the end away from the first bend connected to and communicating with the third straight pipe section through the second bend. The third straight pipe section extends along the second direction and is located on the same side of the second straight pipe section along the second direction. The end of the third straight pipe section away from the second bend is connected to and communicating with the second reducing pipe section through the third bend. The second direction, the third direction, and the first direction intersect each other.

13. The battery device according to claim 12, characterized in that, The second reducing pipe section extends along the first direction. One end of the third bend is connected to the third straight pipe section, and the other end bends toward the first bulkhead and is connected to and communicates with the second variable diameter pipe section.

14. The battery device according to claim 12, characterized in that, The first reducing pipe section extends along the second direction. The guide pipe also includes a connecting bend, one end of which is connected to and communicates with the first variable diameter pipe section, and the other end is bent toward the first tank wall and communicates with the pressure relief port.

15. The battery device according to claim 14, characterized in that, The flow guide further includes a first connecting part, which is connected to and surrounds the connecting bend, and the first connecting part abuts against the surface of the first tank wall facing the first bulkhead.

16. The battery device according to claim 10, characterized in that, The flow guide further includes a second connecting part, which is connected to and surrounds the second variable diameter pipe section. The second connecting part is used to contact the surface of the first bulkhead facing the first tank wall and is connected by fasteners.

17. The battery device according to any one of claims 1 to 5, 9, 11 to 16, characterized in that, The battery cell includes an electrode assembly, which includes a positive electrode sheet. The positive electrode sheet includes a positive electrode active material, which is lithium nickel cobalt manganese oxide, wherein the molar content of nickel is more than 90%. The length of the flow channel along its flow direction is greater than or equal to 400 mm and less than or equal to 900 mm.

18. The battery device according to claim 17, characterized in that, The electrode assembly further includes a negative electrode sheet, which comprises a negative electrode active material. The negative electrode active material includes graphite and silicon-based materials, with the silicon-based material accounting for 5% of the total mass of the negative electrode active material. The length of the flow channel along its flow direction is greater than or equal to 400 mm and less than or equal to 600 mm.

19. The battery device according to claim 17, characterized in that, The electrode assembly further includes a negative electrode sheet, which comprises a negative electrode active material. The negative electrode active material includes graphite and silicon-based materials, with the silicon-based material accounting for 40% of the total mass of the negative electrode active material. The length of the flow channel along its flow direction is greater than or equal to 700 mm and less than or equal to 900 mm.

20. The battery device according to any one of claims 1 to 5, 9, 11 to 16, 18 and 19, characterized in that, The end of the flow guide near the discharge port is provided with a filter screen and / or a first pressure relief mechanism.

21. The battery device according to any one of claims 1 to 5, 9, 11 to 16, 18 and 19, characterized in that, The battery box includes a box body and a box cover, the box cover and the box body being fastened together along the first direction, forming the receiving cavity between them. The housing includes a support wall and a first housing wall. The support wall supports the battery cell from one side in the first direction. The first housing wall is located on the side of the support wall opposite to the battery cell in the first direction and forms a pressure relief cavity with the support wall. The support wall has a vent hole that runs through in the first direction. The vent hole is closed by a sealing member. When the pressure or temperature on the sealing member reaches a predetermined threshold, the vent hole opens.

22. The battery device according to any one of claims 1 to 5, 9, 11 to 16, 18 and 19, characterized in that, The first box wall has a plurality of pressure relief ports, and the flow guide is provided with a plurality of flow guides, each of which is connected to at least one pressure relief port.

23. An electrical appliance, characterized in that, include: The electrical device has a battery housing cavity; The battery device according to any one of claims 1 to 22 is disposed within the battery receiving cavity.

24. The electrical equipment according to claim 23, characterized in that, The electrical equipment includes an aircraft, which includes the battery device and the body that serves as the electrical equipment.

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