Battery device and electric device

Abstract

The invention provides a battery device and a power utilization device. The battery device comprises a battery monomer, a box body, a first pressure relief mechanism and a second pressure relief mechanism, the box body is provided with a containing cavity, the battery monomers are contained in the containing cavity, the box body comprises a first flow channel and a second flow channel, and the first flow channel and the second flow channel are respectively communicated with the containing cavity. The first pressure relief mechanism and the second pressure relief mechanism are arranged in the box body, the battery monomer is provided with a third pressure relief mechanism, and the first flow channel is configured to be capable of guiding emissions discharged from the third pressure relief mechanism to the first pressure relief mechanism so as to be discharged out of the box body; the second flow channel is configured to be capable of guiding emissions discharged from the third pressure relief mechanism to the second pressure relief mechanism so as to be discharged out of the box body. The actuating pressure of the first pressure relief mechanism is smaller than that of the second pressure relief mechanism, and the length of the shortest path of the first flow channel is larger than that of the shortest path of the second flow channel. According to the battery device provided by the invention, the environmental pollution is reduced, and the reliability of the battery device is improved.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, the environmental friendliness under thermal runaway conditions is also a problem that needs to be considered. Therefore, how to reduce the environmental pollution caused by thermal runaway of battery devices is an ongoing issue for improvement in battery device technology. Summary of the Invention

[0004] This application provides a battery device and an electrical device to reduce environmental pollution in the event of thermal runaway of the battery device.

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

[0006] In a first aspect, the battery device provided in the embodiments of this application includes a battery cell, a housing, a first pressure relief mechanism, and a second pressure relief mechanism. The housing has a receiving cavity, in which the battery cell is housed. The housing includes a first flow channel and a second flow channel, which are respectively connected to the receiving cavity. The first and second pressure relief mechanisms are disposed in the housing, and the battery cell is provided with a third pressure relief mechanism. The first flow channel is configured to guide emissions from the third pressure relief mechanism to the first pressure relief mechanism for discharge from the housing, and the second flow channel is configured to guide emissions from the third pressure relief mechanism to the second pressure relief mechanism for discharge from the housing. The actuation pressure of the first pressure relief mechanism is less than the actuation pressure of the second pressure relief mechanism, and the length of the shortest path of the first flow channel is greater than the length of the shortest path of the second flow channel.

[0007] The battery device provided in this application embodiment, by setting the braking pressure of the first pressure relief mechanism to be less than that of the second pressure relief mechanism, and setting the length of the shortest path of the first flow channel to be greater than that of the shortest path of the second flow channel, allows for pressure relief through the first flow channel and the first pressure relief mechanism when the pressure inside the accommodating cavity is low. This allows the emissions to remain in the first flow channel of the housing for a longer period, facilitating thorough treatment of the emissions and reducing the concentration of emissions and harmful substances discharged to the outside of the housing, thus reducing environmental pollution. As the air pressure inside the accommodating cavity increases, pressure can be relieved simultaneously through the first and second pressure relief mechanisms, which helps to increase the rate of emission and the pressure drop rate inside the accommodating cavity, thereby improving the reliability of the battery device.

[0008] According to some embodiments of this application, the box body includes a first beam having a first channel, and a first flow channel and / or a second flow channel including the first channel.

[0009] In the above scheme, by utilizing the space within the first beam to set at least a portion of at least one of the first flow channel and the second flow channel, it is beneficial to simplify the structure of the housing, save the space occupied by the housing, and thus improve the energy density of the battery device.

[0010] According to some embodiments of this application, the first channel includes a plurality of first sub-channels, which extend along a first direction and are arranged separately along a second direction. The first direction and the second direction intersect, and the plurality of first sub-channels are connected end to end at both ends of the first direction.

[0011] In the above scheme, the first channel inside the first beam is arranged in an "S" or "bow" shape, which is conducive to increasing the path length of the first channel and making full use of the space inside the first beam, further facilitating more thorough treatment of the emissions.

[0012] According to some embodiments of this application, the box body further includes a second beam that intersects with the first beam. The second beam has a second channel that communicates with the first channel, and the first flow channel and / or the second flow channel includes the second channel.

[0013] In the above scheme, a second channel is set in the second beam, and at least one of the first flow channel and the second flow channel includes the second channel. This is beneficial to make full use of the space inside the box, further saving the space occupied by the box and improving the energy density of the battery device.

[0014] According to some embodiments of this application, the second channel includes a plurality of second sub-channels, which extend along a third direction and are arranged separately along a second direction. The second direction intersects with the third direction, and the plurality of second sub-channels are connected end to end at both ends of the third direction.

[0015] In the above scheme, the second channel inside the beam is distributed in an "S" or "bow" shape, which is conducive to increasing the path length of the second channel and making full use of the space inside the second beam, further facilitating more thorough treatment of emissions.

[0016] According to some embodiments of this application, the housing has a common flow channel, and both the first flow channel and the second flow channel include the common flow channel.

[0017] In the above scheme, the discharge in the accommodating cavity needs to flow through a common flow channel in the process of flowing to the first pressure relief mechanism and the second pressure relief mechanism. That is, the first flow channel and the second flow channel both include a common flow channel. This helps to simplify the space occupied by the first flow channel and the second flow channel inside the box and also helps to simplify the structure of the box.

[0018] According to some embodiments of this application, the battery device further includes a fourth pressure relief mechanism disposed in the housing, the actuation pressure of the fourth pressure relief mechanism being greater than the actuation pressure of the first pressure relief mechanism. The fourth pressure relief mechanism is configured to guide emissions released from the third pressure relief mechanism to the first pressure relief mechanism via the fourth pressure relief mechanism, the length of the shortest path of the first flow channel being greater than the length of the shortest path from the first pressure relief mechanism to the receiving cavity via the fourth pressure relief mechanism.

[0019] In the above scheme, the length of the shortest path of the first flow channel is greater than the length of the shortest path from the first pressure relief mechanism to the accommodating cavity via the fourth pressure relief mechanism. Therefore, after the fourth pressure relief mechanism is activated, the discharge in the accommodating cavity can reach the first pressure relief mechanism via the fourth pressure relief mechanism through a shorter path, so as to release the pressure in the accommodating cavity more quickly and reduce the risk of explosion in the event of thermal runaway of the battery device.

[0020] According to some embodiments of this application, the actuation pressure of the fourth pressure relief mechanism is less than or equal to the actuation pressure of the second pressure relief mechanism.

[0021] In the above scheme, as the air pressure inside the containment cavity continues to rise, it is easier for the exhaust materials to be discharged more promptly, which helps to further reduce the risk of explosion due to excessive internal pressure of the battery device and further improve the reliability of the battery device.

[0022] According to some embodiments of this application, the wall of the first flow channel includes a first through hole and a second through hole, and the fourth pressure relief mechanism is movable relative to the first through hole and the second through hole to block or connect the first through hole and the second through hole. The path from the first through hole to the second through hole via the first flow channel is greater than the path from the first through hole to the second through hole via the fourth pressure relief mechanism.

[0023] In the above scheme, by setting the wall of the first flow channel to include a first through hole and a second through hole, and setting a fourth pressure relief mechanism that can move relative to the first through hole and the second through hole, it is beneficial to simplify the structure of the fourth pressure relief mechanism and to simplify the arrangement of the pipeline inside the box.

[0024] According to some embodiments of this application, the second pressure relief mechanism includes a body portion and a movable portion, the movable portion being configured to move relative to the body portion when the second pressure relief mechanism is actuated. The battery device also includes a linkage mechanism connecting the movable portion and the fourth pressure relief mechanism, the movable portion being configured to drive the fourth pressure relief mechanism to move, thereby blocking or connecting the first through hole and the second through hole.

[0025] In the above scheme, by setting up a linkage mechanism, the action of the fourth pressure relief mechanism can be driven more timely and reliably, so as to more reliably realize the connection between the first through hole and the second through hole, and facilitate the battery device to release pressure more timely and reliably.

[0026] According to some embodiments of this application, the battery device further includes a battery management system, which is electrically connected to the second pressure relief mechanism and the fourth pressure relief mechanism, respectively. The battery management system is configured to issue actuation information to actuate the fourth pressure relief mechanism upon receiving a signal that the second pressure relief mechanism is actuated.

[0027] In the above scheme, controlling the actuation of the fourth pressure relief mechanism through the battery management system helps to simplify the structure of the battery device.

[0028] According to some embodiments of this application, the inner wall of the first flow channel is provided with a protruding structure; and / or, the inner wall of the second flow channel is provided with a protruding structure.

[0029] In the above scheme, a protruding structure is provided on the inner wall of at least one of the first flow channel and the second flow channel to increase the contact area between the emissions and the first flow channel and / or the second flow channel. This is beneficial to improving the condensation and adsorption effect of the inner wall of the first flow channel and / or the second flow channel on the emissions, further reducing the concentration and content of harmful substances in the emissions discharged to the outside of the battery device, and further reducing environmental pollution.

[0030] According to some embodiments of this application, the battery device further includes a processing mechanism for adsorbing or intercepting emissions, and the processing mechanism is disposed in a first flow channel and / or a second flow channel.

[0031] In the above scheme, by setting up a treatment mechanism to adsorb or condense the emissions, it is beneficial to further reduce the concentration of emissions and the content of harmful substances emitted to the outside of the battery device, and further reduce environmental pollution.

[0032] According to some embodiments of this application, the processing mechanism includes a blocking member disposed within a first flow channel and / or a second flow channel, and having a through hole for allowing emissions to pass through the blocking member. The blocking member is configured to intercept a portion of the particles in the emissions within the first flow channel and / or the second flow channel.

[0033] In the above scheme, the treatment mechanism includes a blocking component, which helps to improve the interception effect of the treatment mechanism on particles or droplets in the emissions and also helps to simplify the overall structure of the treatment mechanism.

[0034] According to some embodiments of this application, the processing mechanism includes a plurality of blocking members, which are spaced apart along the extension direction of the first flow channel and / or the second flow channel.

[0035] In the above scheme, multiple blocking components are provided in at least one of the first flow channel and the second flow channel. In the event of thermal runaway of the battery device, this is beneficial to further reduce the concentration of emissions and the content of harmful substances, and further beneficial to reduce the environmental pollution caused by thermal runaway of the battery device.

[0036] According to some embodiments of this application, the processing mechanism includes a liquid suction member configured to absorb liquid in a first flow channel and / or a second flow channel.

[0037] In the above scheme, by setting up a liquid suction device, the liquid droplets in the discharge in the first or second flow channel can be adsorbed, which helps to further reduce the concentration of discharge and the content of harmful substances in the discharge to the outside of the battery device, and further helps to reduce environmental pollution in the event of thermal runaway of the battery device.

[0038] According to some embodiments of this application, the liquid-absorbing element includes foam.

[0039] In the above scheme, the liquid absorption component includes foam, which not only improves the liquid absorption effect of the liquid absorption component, but also helps to reduce the production cost of the battery device.

[0040] According to some embodiments of this application, the suction element is connected to the periphery of the inner wall of the first flow channel and / or the second flow channel, and has a third through hole for allowing the discharge to pass through the suction element.

[0041] In the above scheme, it is beneficial to improve the structural stability of the liquid suction component, and during the process of the discharged material passing through the liquid suction component, it will collide with the liquid suction component, and the liquid droplets therein are more easily sucked up by the liquid suction component.

[0042] Secondly, the electrical device provided in the embodiments of this application includes the battery device provided in any of the above embodiments, and the battery device is used to provide electrical energy.

[0043] The electrical device provided in this application embodiment has the same technical effect as the battery device provided in the above embodiment, and will not be described again here.

[0044] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application;

[0047] Figure 2 This is a schematic diagram of the structure of the battery device provided in the embodiments of this application;

[0048] Figure 3 This is a schematic diagram of the structure of a single battery cell in the battery device provided in the embodiments of this application;

[0049] Figure 4 This is a partial structural schematic diagram of a battery device provided in an embodiment of this application;

[0050] Figure 5 This is a partial structural schematic diagram of another battery device provided in an embodiment of this application;

[0051] Figure 6 A partial structural schematic diagram of another battery device provided in an embodiment of this application;

[0052] Figure 7 A partial structural diagram of a battery device in an unactivated state, provided in an embodiment of this application;

[0053] Figure 8 for Figure 7 A magnified view of a section at point A in the middle;

[0054] Figure 9 A partial structural diagram of the fourth pressure relief mechanism in the actuated state of the battery device provided in the embodiment of this application;

[0055] Figure 10 This is a partial structural diagram of the battery device provided in an embodiment of this application;

[0056] Figure 11 for Figure 10 A magnified view of a section at point B in the middle;

[0057] Figure 12 A partial cross-sectional view of the battery device provided in an embodiment of this application;

[0058] Figure 13 A partial structural schematic diagram of another battery device provided in this application embodiment;

[0059] Figure 14 A partial structural schematic diagram of another battery device provided in an embodiment of this application;

[0060] Figure 15 A partial structural schematic diagram of another battery device provided in an embodiment of this application;

[0061] Figure 16 for Figure 15 A magnified view of a section at point C.

[0062] The accompanying drawings are not necessarily drawn to scale.

[0063] Explanation of reference numerals in the attached figures:

[0064] 1-Vehicle;

[0065] 10-Battery assembly; 11-Casing; 11a-Receiving cavity; 11b-First flow channel; 111b-First through hole; 112b-Second through hole; 11c-Second flow channel; 11d-Common flow channel; 111-First sub-casing; 112-Second sub-casing; 113-First beam; 113a-First channel; 1131a-First sub-flow channel; 114-Second beam; 114a-Second channel; 1141a-Second sub-flow channel; 115-Protruding structure; 1a-Motor; 1b-Controller;

[0066] 20-Battery Module;

[0067] 30-Battery cell; 31-Casing; 311-Housing shell; 312-End cap; 32-Electrode assembly; 321-Electrode body; 322-Taper; 33-Electrode terminal; 34-Third pressure relief mechanism;

[0068] 40 - First pressure relief mechanism;

[0069] 50 - Second pressure relief mechanism; 51 - Main body; 52 - Moving part;

[0070] 60 - Fourth pressure relief mechanism;

[0071] 70-Linkage mechanism;

[0072] 80 - Processing mechanism; 81 - Blocking component; 82 - Liquid suction component; 82a - Third through hole;

[0073] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0076] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0077] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0078] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0079] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0080] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0081] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0082] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0083] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0084] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0085] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0086] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0087] 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.

[0088] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0089] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0090] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0091] 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.

[0092] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, carbon electrodes, carbon, nickel, or titanium with a silver-plated surface. 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 alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0093] 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 positive electrode active materials for battery cells may also be used.

[0094] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0095] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc.

[0096] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0097] 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 in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0098] In some embodiments, the diaphragm is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0099] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0100] In some embodiments, the membrane is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0101] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0102] In some implementations, the electrode assembly is a stacked structure.

[0103] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0104] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0105] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0106] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0107] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0108] In related technologies, the battery cells inside the battery device generate a large amount of high-temperature and high-pressure emissions under thermal runaway conditions. These emissions need to be discharged to the outside of the battery device to reduce the internal pressure and thus reduce the risk of the battery device exploding.

[0109] However, in the event of thermal runaway of the battery device, if the emissions remain in the enclosure for a short period during the emission process, it is difficult to treat the emissions, and the emissions contain a high concentration of harmful substances, which can cause environmental pollution. On the other hand, if the emissions remain in the enclosure for a long time, a large amount of emissions will accumulate, creating high pressure and posing a certain risk of explosion to the battery device, thus affecting its reliability.

[0110] In view of this, embodiments of this application provide a battery device, which includes a battery cell, a housing, a first pressure relief mechanism, and a second pressure relief mechanism. The housing has a receiving cavity in which the battery cell is housed. The housing includes a first flow channel and a second flow channel, which are respectively connected to the receiving cavity. The first and second pressure relief mechanisms are disposed in the housing, and the battery cell is provided with a third pressure relief mechanism. The first flow channel is configured to guide emissions from the third pressure relief mechanism to the first pressure relief mechanism for discharge from the housing, and the second flow channel is configured to guide emissions from the third pressure relief mechanism to the second pressure relief mechanism for discharge from the housing. The actuation pressure of the first pressure relief mechanism is less than the actuation pressure of the second pressure relief mechanism, and the length of the shortest path of the first flow channel is greater than the length of the shortest path of the second flow channel.

[0111] The battery device provided in this application embodiment, by setting the braking pressure of the first pressure relief mechanism to be less than that of the second pressure relief mechanism, and setting the length of the shortest path of the first flow channel to be greater than that of the shortest path of the second flow channel, allows for pressure relief through the first flow channel and the first pressure relief mechanism when the pressure inside the accommodating cavity is low. This allows the emissions to remain in the first flow channel of the housing for a longer period, facilitating thorough treatment of the emissions and reducing the concentration of emissions and harmful substances discharged to the outside of the housing, thus reducing environmental pollution. As the air pressure inside the accommodating cavity increases, pressure can be relieved simultaneously through the first and second pressure relief mechanisms, which helps to increase the rate of emission and the pressure drop rate inside the accommodating cavity, thereby improving the reliability of the battery device.

[0112] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0113] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0114] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0115] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0116] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1.

[0117] The vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0118] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0119] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in the embodiments of this application. Figure 3This is a schematic diagram of the structure of a battery cell 30 in a battery device 10 provided in an embodiment of this application. The battery device 10 includes a housing 11 and a battery cell 30, with the battery cell 30 housed within the housing 11. The housing 11 provides a space for accommodating the battery cell 30, and the housing 11 can adopt various structures. In some embodiments, the housing 11 may include a first sub-housing 111 and a second sub-housing 112, which overlap each other, and together define a space for accommodating the battery cell 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-like structure. The first sub-box 111 covers the opening side of the second sub-box 112 so that the first sub-box 111 and the second sub-box 112 together define the accommodating space. Alternatively, the first sub-box 111 and the second sub-box 112 can both be hollow structures with one side open, and the opening side of the first sub-box 111 covers the opening side of the second sub-box 112.

[0120] In the battery device 10, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 30 are connected in both series and parallel configurations. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 30 is housed within the housing 11. Alternatively, the battery device 10 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed manner to form a battery module 20, and then multiple battery modules 20 connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0121] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0122] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a single battery cell 30 in the battery device 10 provided in an embodiment of this application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals 33. The housing 31 includes a casing 311 and an end cap 312. The casing 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0123] The housing 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can accommodate the electrode assembly 32, electrolyte, and other components. The housing 311 and the end cap 312 can be independent components. The housing 311 can have various shapes and sizes. Specifically, the shape of the housing 311 can be determined according to the specific shape and size of the electrode assembly 32. The housing 311 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0124] End cap 312 refers to a component that covers the opening of housing 311 to isolate the internal environment of battery cell 30 from the external environment. The shape of end cap 312 can be adapted to the shape of housing 311 to fit it. Optionally, end cap 312 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 312 is not easily deformed under pressure and impact, giving battery cell 30 higher structural strength and improved reliability. Functional components such as electrode terminals 33 can be provided on end cap 312. Electrode terminals 33 can be used for electrical connection with electrode assembly 32 to output or input electrical energy to battery cell 30. The material of end cap 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 312. The insulating structure can be used to isolate the electrical connection components within the housing 311 from the end cap 312 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0125] Electrode assembly 32 is the component in the battery cell 30 where electrochemical reactions occur. The housing 311 may contain one or more electrode assemblies 32. The electrode assembly 32 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates to separate them and prevent internal short circuits. The portions of the positive and negative electrode plates containing active material constitute the electrode body 321 of the electrode assembly 32, while the portions of the positive and negative electrode plates without active material each constitute a tab 322. The positive and negative tabs may be located together at one end of the electrode body 321 or separately at both ends of the electrode body 321. During the charging and discharging process of the battery cell 30, the positive and negative active materials react with the electrolyte, and the tabs 322 connect to the electrode terminals 33 to form a current loop.

[0126] In some embodiments, a third pressure relief mechanism 34 is provided on the housing 31, which is used to release the internal pressure of the battery cell 30.

[0127] As an example, the internal pressure or temperature of the battery cell 30 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 30 reaches the predetermined threshold, the third pressure relief mechanism 34 is activated or a weak structure provided in the third pressure relief mechanism 34 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. The threshold design varies depending on the 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 30.

[0128] As an example, the third pressure relief mechanism 34 can be integrally formed with the housing 31, for example, by making grooves on the housing 31 to form a weak structure, which serves as the third pressure relief mechanism 34.

[0129] The third pressure relief mechanism 34 can also be separately disposed from and connected to the housing 31, for example, by welding it to the housing 31 or by connecting it through other components. As an example, the third pressure relief mechanism 34 is provided with grooves to form a weak structure.

[0130] As an example, the third pressure relief mechanism 34 can take the form of an explosion-proof valve, a balancing valve, a gas valve, a pressure relief valve, or a safety valve.

[0131] The term "actuation" as used in this application refers to the third pressure relief mechanism 34 being activated or reaching a certain state, thereby releasing the internal pressure and temperature of the battery cell 30. The actions of the third pressure relief mechanism 34 may include, but are not limited to: movement of components within the third pressure relief mechanism 34 to form an exhaust channel; rupture, breakage, tearing, or opening of at least a portion of the third pressure relief mechanism 34, etc. When the third pressure relief mechanism 34 is activated, the high-temperature, high-pressure substances inside the battery cell 30 are discharged outwards from the activated portion as waste. This method allows for pressure and temperature relief of the battery cell 30 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0132] The emissions from the battery cell 30 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0133] Firstly, such as Figure 2 , Figure 3 and Figure 4As shown, the battery device 10 provided in this embodiment includes a battery cell 30, a housing 11, a first pressure relief mechanism 40, and a second pressure relief mechanism 50. The housing 11 has a receiving cavity 11a, in which the battery cell 30 is received. The housing 11 includes a first flow channel 11b and a second flow channel 11c, which are respectively connected to the receiving cavity 11a. The first pressure relief mechanism 40 and the second pressure relief mechanism 50 are disposed in the housing 11. The battery cell 30 is provided with a third pressure relief mechanism 34. The first flow channel 11b is configured to guide the discharge from the third pressure relief mechanism 34 to the first pressure relief mechanism 40 for discharge from the housing 11. The second flow channel 11c is configured to guide the discharge from the third pressure relief mechanism 34 to the second pressure relief mechanism 50 for discharge from the housing 11. The actuation pressure of the first pressure relief mechanism 40 is less than the actuation pressure of the second pressure relief mechanism 50, and the length of the shortest path of the first flow channel 11b is greater than the length of the shortest path of the second flow channel 11c.

[0134] Optionally, the third pressure relief mechanism 34 can be an explosion-proof valve, or the third pressure relief mechanism 34 can be a weak structure provided in the outer shell 31 of the battery cell 30. When the internal pressure of the battery cell 30 reaches the actuation pressure of the third pressure relief mechanism 34, the third pressure relief mechanism 34 is actuated, and the discharge inside the battery cell 30 can be discharged into the accommodating cavity 11a through the third pressure relief mechanism 34.

[0135] The first pressure relief mechanism 40 and the second pressure relief mechanism 50 are disposed on the housing 11. Optionally, the first pressure relief mechanism 40 and the second pressure relief mechanism 50 may have the same structure as the third pressure relief mechanism 34 or may have different structures.

[0136] In the event of thermal runaway of battery cell 30, the emissions can first be discharged into the accommodating cavity 11a, and then flow to the first flow channel 11b and the second flow channel 11c respectively.

[0137] Optionally, the first flow channel 11b and the second flow channel 11c can be independent of each other and not connected to each other, or the first and second flow channels 11c can be connected to each other, or the first flow channel 11b and the second flow channel 11c can be partially overlapped. The specific settings can be made according to actual needs.

[0138] The path of the first flow channel 11b can be the shortest path between the inlet of the first flow channel 11b near the receiving cavity 11a and the outlet connected to the first pressure relief mechanism 40. It is understood that the battery device 10 can have multiple first flow channels 11b, and the path lengths of the different first flow channels 11b are not necessarily the same. The length of the shortest path of the first flow channel 11b can be the length of the path corresponding to the first flow channel 11b with the shortest path length among the multiple first flow channels 11b.

[0139] Similarly, the path of the second flow channel 11c can be the shortest path between the inlet of the second flow channel 11c near the receiving cavity 11a and the outlet connected to the second pressure relief mechanism 50. The housing 11 can have multiple second flow channels 11c, and the path lengths of different second flow channels 11c are not exactly the same. The length of the shortest path of the second flow channel 11c can be the length of the path corresponding to the second flow channel 11c with the shortest path length among the multiple second flow channels 11c.

[0140] The method for measuring the length of the path of the first flow channel 11b and the second flow channel 11c can be to measure the total length of the pipe from the inlet to the outlet of the first flow channel 11b or the second flow channel 11c. If the first flow channel 11b or the second flow channel 11c has multiple segments, the length of each segment can be measured separately, and then the lengths of the multiple segments can be added together to obtain the total length of the path of the first flow channel 11b or the second flow channel 11c.

[0141] Alternatively, a wire threading method can be used, in which a flexible element such as a steel wire is threaded into the inlet of the first flow channel 11b or the second flow channel 11c, along the path of the first flow channel 11b or the second flow channel 11c, and out of the outlet of the first flow channel 11b or the second flow channel 11c. The length of the steel wire from the inlet to the outlet is the length of the path of the first flow channel 11b or the second flow channel 11c.

[0142] Optionally, the specific lengths of the paths of the first flow channel 11b and the second flow channel 11c can be set according to actual needs. For example, the length of the path of the first flow channel 11b can be set to be greater than or equal to 4m, while the length of the path of the second flow channel 11c can be set to be less than 4m. Alternatively, the length of the path of the first flow channel 11b can be set to be greater than or equal to 2m, while the length of the path of the second flow channel 11c can be set to be less than 2m.

[0143] The actuation pressures of the first pressure relief mechanism 40 and the second pressure relief mechanism 50 can be set to specific values ​​according to the specific circumstances of the battery device 10. For example, the actuation pressure of the first pressure relief mechanism 40 can be set to be less than or equal to 10 kPa, while the actuation pressure of the second pressure relief mechanism 50 can be set to be greater than 10 kPa.

[0144] If the shortest path length of the first flow channel 11b is greater than that of the second flow channel 11c, then in the event of thermal runaway of the battery device 10, the emissions in the accommodating cavity 11a will remain in the first flow channel 11b for a longer period than they will remain in the second flow channel 11c for a longer period than they will remain in the second flow channel 11c for a longer period than they will remain in the second flow channel 11c for a longer period. Thus, emissions discharged via the first flow channel 11b are treated more thoroughly than those discharged via the second flow channel 11c, which helps reduce the content of harmful substances in the emissions and thereby reduces environmental pollution.

[0145] Because the shortest path length of the second flow channel 11c is less than that of the first flow channel 11b, the discharge of the exhaust material through the second flow channel 11c is faster than that through the first flow channel 11b. This facilitates rapid depressurization of the accommodating cavity 11a of the battery device 10, reduces the risk of excessive internal pressure in the battery device 10, and improves the reliability of the battery device 10.

[0146] In the event of thermal runaway of the battery device 10, the amount of discharge into the accommodating cavity 11a increases continuously, and the pressure in the accommodating cavity 11a also increases continuously. Since the actuation pressure of the first pressure relief mechanism 40 is less than the actuation pressure of the second pressure relief mechanism 50, as the pressure in the accommodating cavity 11a increases, the pressure in the accommodating cavity 11a reaches the actuation pressure of the first pressure relief mechanism 40 first, so that the first pressure relief mechanism 40 is actuated before the second pressure relief mechanism 50, and the pressure in the accommodating cavity 11a is released.

[0147] Thus, when the gas pressure within the accommodating cavity 11a is greater than the actuation pressure of the first pressure relief mechanism 40 but less than the actuation pressure of the second pressure relief mechanism 50, the emissions are first discharged to the outside of the battery device 10 via the first flow channel 11b and the first pressure relief mechanism 40. Because the path length of the first flow channel 11b is relatively long, the emissions remain in the first flow channel 11b for a longer period, facilitating thorough treatment of the emissions within the first flow channel 11b, such as condensation or cooling, to reduce the concentration of emissions and the content of harmful substances discharged to the outside of the battery device 10.

[0148] If the thermal runaway of the battery device 10 is severe, and the rate at which the battery cells 30 release emissions exceeds the rate at which the first pressure relief mechanism 40 releases emissions, the pressure inside the accommodating cavity 11a will gradually increase. When the pressure inside the accommodating cavity 11a reaches the actuation pressure of the second pressure relief mechanism 50, the second pressure relief mechanism 50 will be actuated and begin to release the pressure inside the battery device 10. Since the shortest path length of the second flow channel 11c is shorter, the emissions inside the accommodating cavity 11a can be quickly discharged to the outside of the battery device 10 via the second flow channel 11c and the second pressure relief mechanism 50.

[0149] The battery device 10 provided in this application embodiment, by setting the actuation pressure of the first pressure relief mechanism 40 to be less than the actuation pressure of the second pressure relief mechanism 50, and setting the length of the shortest path of the first flow channel 11b to be greater than the length of the shortest path of the second flow channel 11c, can release pressure through the first flow channel 11b and the first pressure relief mechanism 40 when the pressure in the accommodating cavity 11a is low, so that the emissions remain in the first flow channel 11b of the housing 11 for a longer time, which is conducive to the full treatment of the emissions and helps to reduce the concentration of emissions and the content of harmful substances discharged to the outside of the housing 11, thereby reducing environmental pollution. As the air pressure in the accommodating cavity 11a increases, pressure can be released simultaneously through the first pressure relief mechanism 40 and the second pressure relief mechanism 50, which helps to increase the emission rate of emissions and the pressure drop rate in the accommodating cavity 11a, thereby improving the reliability of the battery device 10.

[0150] In some embodiments, such as Figure 5 As shown, the box body 11 includes a first beam 113, the first beam 113 having a first channel 113a, a first flow channel 11b and / or a second flow channel 11c including the first channel 113a.

[0151] The box body 11 includes a first beam 113, which can be a crossbeam or a longitudinal beam of the box body 11, or the first beam 113 can be included in both the crossbeams and the weight of the box body 11. The first beam 113 can improve the structural strength of the box body 11, so that the box body 11 has a certain supporting function.

[0152] The first beam 113 has a first channel 113a, and at least one of the first flow channel 11b and the second flow channel 11c includes the first channel 113a, that is, at least a portion of at least one of the first flow channel 11b and the second flow channel 11c is provided by the first beam 113.

[0153] In embodiments where both the first flow channel 11b and the second flow channel 11c have a first channel 113a, the first channel 113a of the first flow channel 11b and the first channel 113a of the second flow channel 11c can be set to be independent of each other, partially overlapping or completely overlapping, depending on actual needs.

[0154] Thus, by utilizing the space within the first beam 113 to set at least a portion of at least one of the first flow channel 11b and the second flow channel 11c, it is beneficial to simplify the structure of the housing 11, save the space occupied by the housing 11, and thereby improve the energy density of the battery device 10.

[0155] In some embodiments, please continue reading Figure 5The first channel 113a includes a plurality of first sub-channels 1131a. The plurality of first sub-channels 1131a extend along the first direction X and are arranged separately along the second direction Y. The first direction X intersects the second direction Y. The plurality of first sub-channels 1131a are connected end to end at both ends of the first direction X.

[0156] Thus, the first channel 113a within the first beam 113 is arranged in an "S" or "bow" shape, which helps to increase the path length of the first channel 113a and makes full use of the space within the first beam 113, further facilitating more thorough treatment of the emissions.

[0157] In some embodiments, such as Figure 5 As shown, the box body 11 also includes a second beam 114, which intersects with the first beam 113. The second beam 114 has a second channel 114a, which is connected to the first channel 113a. The first flow channel 11b and / or the second flow channel 11c include the second channel 114a.

[0158] If the second beam 114 intersects with the first beam 113, then one of the first beams 113 can be set as a horizontal beam and the other as a vertical beam.

[0159] Optionally, one of the first flow channel 11b and the second flow channel 11c may include the second channel 114a, or both the first flow channel 11b and the second flow channel 11c may include the second channel 114a.

[0160] In embodiments where both the first flow channel 11b and the second flow channel 11c include a second channel 114a, the second channels 114a of the first flow channel 11b and the second channels 114a of the second flow channel 11c may be set to be independent of each other, partially overlapping, or completely overlapping.

[0161] By setting a second channel 114a in the second beam 114 and setting at least one of the first flow channel 11b and the second flow channel 11c including the second channel 114a, it is beneficial to make full use of the space inside the housing 11, further saving the space occupied by the housing 11 and improving the energy density of the battery device 10.

[0162] In some embodiments, such as Figure 5 As shown, the second channel 114a includes multiple second sub-channels 1141a. The multiple second sub-channels 1141a extend along the third direction Z and are arranged separately along the second direction Y. The second direction Y intersects with the third direction Z. The multiple second sub-channels 1141a are connected end to end at both ends of the third direction Z.

[0163] The second channel 114a inside the beam is distributed in an "S" or "bow" shape, which helps to increase the path length of the second channel 114a and makes full use of the space inside the second beam 114, further facilitating more thorough treatment of emissions.

[0164] In some embodiments, such as Figure 4 As shown, the housing 11 has a common flow channel 11d, and the first flow channel 11b and the second flow channel 11c both include the common flow channel 11d.

[0165] Thus, the discharge in the accommodating cavity 11a needs to flow through the common flow channel 11d in the process of flowing to the first pressure relief mechanism 40 and the second pressure relief mechanism 50. That is, the first flow channel 11b and the second flow channel 11c both include the common flow channel 11d. This helps to simplify the space occupied by the first flow channel 11b and the second flow channel 11c inside the housing 11 and also helps to simplify the structure of the housing 11.

[0166] In some embodiments, such as Figure 6 As shown, the battery device 10 also includes a fourth pressure relief mechanism 60, which is disposed in the housing 11. The actuation pressure of the fourth pressure relief mechanism 60 is greater than the actuation pressure of the first pressure relief mechanism 40. The fourth pressure relief mechanism 60 is configured to guide emissions from the third pressure relief mechanism 34 to the first pressure relief mechanism 40 via the fourth pressure relief mechanism 60. The length of the shortest path of the first flow channel 11b is greater than the length of the shortest path from the first pressure relief mechanism 40 to the receiving cavity 11a via the fourth pressure relief mechanism 60.

[0167] Optionally, the fourth pressure relief mechanism 60 may be located inside the first flow channel 11b, or the fourth pressure relief mechanism 60 may be located outside the first flow channel 11b and connected to the first flow channel 11b via a pipeline or the like.

[0168] If the actuation pressure of the fourth pressure relief mechanism 60 is greater than that of the first pressure relief mechanism 40, then the first pressure relief mechanism 40 will open before the fourth pressure relief mechanism 60, and the discharged material needs to flow through the first flow channel 11b to the first pressure relief mechanism 40.

[0169] As the air pressure inside the accommodating cavity 11a increases, when the fourth pressure relief mechanism 60 is activated, the discharge inside the accommodating cavity 11a can flow to the first pressure relief mechanism 40 via a shorter path corresponding to the fourth pressure relief mechanism 60, and be discharged to the outside of the battery device 10.

[0170] Alternatively, the fourth pressure relief mechanism 60 can be of any suitable structural type, as long as it can be actuated and allow discharge to pass when the pressure reaches its actuation pressure.

[0171] Optionally, the actuation pressure of the fourth pressure relief mechanism 60 can be greater than, less than or equal to the actuation pressure of the second pressure relief mechanism 50, and can be selected according to actual needs.

[0172] Since the length of the shortest path of the first flow channel 11b is greater than the length of the shortest path from the first pressure relief mechanism 40 to the accommodating cavity 11a via the fourth pressure relief mechanism 60, after the fourth pressure relief mechanism 60 is activated, the discharge in the accommodating cavity 11a can reach the first pressure relief mechanism 40 via the fourth pressure relief mechanism 60 through a shorter path, so as to release the pressure in the accommodating cavity 11a more quickly and reduce the risk of explosion in the event of thermal runaway of the battery device 10.

[0173] In some embodiments, the actuation pressure of the fourth pressure relief mechanism 60 is less than or equal to the actuation pressure of the second pressure relief mechanism 50.

[0174] When the actuation pressure of the fourth pressure relief mechanism 60 is less than the actuation pressure of the second pressure relief mechanism 50, the second pressure relief mechanism 50 is actuated and begins to release pressure. At this time, the discharge in the accommodating cavity 11a needs to pass through the first flow channel 11b with a longer path in the process of flowing to the first pressure relief mechanism 40, so that the discharge can be fully treated in the first flow channel 11b.

[0175] As the air pressure inside the accommodating cavity 11a further increases, the fourth pressure relief mechanism 60 is activated, and the discharge from the accommodating cavity 11a can flow to the first pressure relief mechanism 40 via the fourth pressure relief mechanism 60 to facilitate rapid pressure relief.

[0176] When the actuation pressure of the fourth pressure relief mechanism 60 is equal to the actuation pressure of the second pressure relief mechanism 50, the fourth pressure relief mechanism 60 and the second pressure relief mechanism 50 can be actuated simultaneously to quickly release the pressure in the accommodating cavity 11a.

[0177] Therefore, this configuration facilitates the timely discharge of waste as the air pressure inside the accommodating cavity 11a continuously increases, which helps to further reduce the risk of explosion due to excessive internal pressure in the battery device 10 and further improves the reliability of the battery device 10.

[0178] In some embodiments, such as Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12As shown, the wall of the first flow channel 11b includes a first through hole 111b and a second through hole 112b. The fourth pressure relief mechanism 60 is movable relative to the first through hole 111b and the second through hole 112b to block or connect the first through hole 111b and the second through hole 112b. The path from the first through hole 111b to the second through hole 112b via the first flow channel 11b is greater than the path from the first through hole 111b to the second through hole 112b via the fourth pressure relief mechanism 60.

[0179] When the fourth pressure relief mechanism 60 blocks the first through hole 111b and the second through hole 112b, the discharge in the accommodating cavity 11a needs to pass through the complete first flow channel 11b in its flow to the first pressure relief mechanism 40. However, when the fourth pressure relief mechanism 60 connects the second through hole 112b of the first through hole 111b, the discharge in the accommodating cavity 11a can flow to the first pressure relief mechanism 40 through the first through hole 111b and the second through hole 112b in its flow to the first pressure relief mechanism 40. That is, the discharge in the accommodating cavity 11a can flow to the first pressure relief mechanism 40 through a part of the path of the first flow channel 11b.

[0180] By setting the wall of the first flow channel 11b to include a first through hole 111b and a second through hole 112b, and setting the fourth pressure relief mechanism 60 to be movable relative to the first through hole 111b and the second through hole 112b, it is beneficial to simplify the structure of the fourth pressure relief mechanism 60 and to simplify the arrangement of the pipeline inside the housing 11.

[0181] In some embodiments, such as Figure 10 and Figure 11 As shown, the second pressure relief mechanism 50 includes a body portion 51 and a movable portion 52. The movable portion 52 is configured to move relative to the body portion 51 when the second pressure relief mechanism 50 is actuated. The battery device 10 also includes a linkage mechanism 70, which connects the movable portion 52 and the fourth pressure relief mechanism 60. The movable portion 52 is configured to drive the fourth pressure relief mechanism 60 to move, thereby blocking or connecting the first through hole 111b and the second through hole 112b.

[0182] The linkage mechanism 70 connects the moving part 52 and the fourth pressure relief mechanism 60. When the second pressure relief mechanism 50 is actuated, the moving part 52 moves relative to the main body 51, and drives the fourth pressure relief mechanism 60 to move, thereby connecting the first through hole 111b and the second through hole 112b. Therefore, the fourth pressure relief mechanism 60 is actuated together with the second pressure relief mechanism 50. When the air pressure inside the battery device 10 reaches the actuation pressure of the second pressure relief mechanism 50, the second pressure relief mechanism 50 and the fourth pressure relief mechanism 60 open simultaneously, which helps to increase the rate at which the battery device 10 releases emissions, and the actuation of the fourth pressure relief mechanism 60 can be more timely and reliable.

[0183] Therefore, by setting the linkage mechanism 70, the action of the fourth pressure relief mechanism 60 can be driven more timely and reliably, so as to more reliably realize the connection between the first through hole 111b and the second through hole 112b, and facilitate the battery device 10 to release pressure more timely and reliably.

[0184] In some embodiments, the battery device 10 further includes a battery management system electrically connected to the second pressure relief mechanism 50 and the fourth pressure relief mechanism 60, respectively. The battery management system is configured to issue an actuation message to actuate the fourth pressure relief mechanism 60 upon receiving a signal that the second pressure relief mechanism 50 is actuated.

[0185] Optionally, the actuation of the second pressure relief mechanism 50 can be measured by a pressure sensor or a displacement sensor. The signal received by the battery management system from the actuation of the second pressure relief mechanism 50 can be an electrical signal sent to the battery management system by the pressure sensor or displacement sensor, etc. After obtaining the actuation information of the second pressure relief mechanism 50, the battery management system can send actuation information to the relevant drive mechanism, etc., to actuate the fourth pressure relief mechanism 60.

[0186] Thus, controlling the actuation of the fourth pressure relief mechanism 60 through the battery management system helps to simplify the structure of the battery device 10.

[0187] In some embodiments, such as Figure 13 As shown, the inner wall of the first flow channel 11b is provided with a protruding structure 115; and / or, the inner wall of the second flow channel 11c is provided with a protruding structure 115.

[0188] Optionally, a protrusion structure 115 may be provided on the inner wall of one of the first flow channel 11b and the second flow channel 11c, or a protrusion structure 115 may be provided on the inner walls of both the first flow channel 11b and the second flow channel 11c.

[0189] Thus, a protruding structure 115 is provided on the inner wall of at least one of the first flow channel 11b and the second flow channel 11c to increase the contact area between the emissions and the first flow channel 11b and / or the second flow channel 11c. This is beneficial to improving the condensation and adsorption effect of the inner wall of the first flow channel 11b and / or the second flow channel 11c on the emissions, further reducing the concentration and content of harmful substances in the emissions discharged to the outside of the battery device 10, and further reducing environmental pollution.

[0190] In some embodiments, such as Figure 14 As shown, the battery device 10 also includes a processing mechanism 80, which is used to adsorb or intercept emissions. The processing mechanism 80 is disposed in the first flow channel 11b and / or the second flow channel 11c.

[0191] The treatment unit 80 may include activated carbon or condensation nuclei to adsorb or condense particles or droplets in the emissions, so that more particles or droplets in the emissions are intercepted and retained in the first flow channel 11b and / or the second flow channel 11c.

[0192] Optionally, the processing mechanism 80 may be provided in one of the first flow channel 11b and the second flow channel 11c, or the processing mechanism 80 may be provided in both the first flow channel 11b and the second flow channel 11c.

[0193] By setting up a treatment mechanism 80 to adsorb or condense the emissions, it is beneficial to further reduce the concentration of emissions and the content of harmful substances emitted to the outside of the battery device 10, and further reduce environmental pollution.

[0194] In some embodiments, such as Figure 14 As shown, the processing mechanism 80 includes a blocking member 81 disposed within a first flow channel 11b and / or a second flow channel 11c, and has a through hole for allowing the discharge to pass through the blocking member. The blocking member 81 is configured to intercept a portion of the particles in the discharge within the first flow channel 11b and / or the second flow channel 11c.

[0195] Optionally, a blocking element 81 may be provided in one of the first flow channel 11b and the second flow channel 11c, or a blocking element 81 may be provided in both the first flow channel 11b and the second flow channel 11c.

[0196] If the barrier 81 has a through hole, the discharge can pass through the barrier 81 via the through hole. The barrier 81 may have one or more through holes.

[0197] During the flow of the emissions in the first flow channel 11b and / or the second flow channel 11c, when the emissions encounter the blocking member 81, they will collide with the blocking member 81. Some particles or droplets in the emissions will be blocked and intercepted by the blocking member 81 and remain in the exhaust channel.

[0198] Therefore, including the blocking element 81 in the treatment mechanism 80 is beneficial to improving the interception effect of the treatment mechanism 80 on particles or droplets in the emissions, and also helps to simplify the overall structure of the treatment mechanism 80.

[0199] In some embodiments, such as Figure 14 As shown, the processing mechanism 80 includes a plurality of blocking members 81, which are spaced apart along the extension direction of the first flow channel 11b and / or the second flow channel 11c.

[0200] Multiple blocking elements 81 are provided in at least one of the first flow channel 11b and the second flow channel 11c. The multiple blocking elements 81 in the first flow channel 11b or the second flow channel 11c are arranged at intervals. During the process of the discharged material passing through the first flow channel 11b or the second flow channel 11c, it will collide with different blocking elements 81 multiple times. The particles in the discharged material settle and remain in the first flow channel 11b or the second flow channel 11c. When the droplets in the discharged material encounter the blocking elements 81, they will condense and remain in the first flow channel 11b or the second flow channel 11c. This makes it easier for more particles or droplets in the discharged material to be intercepted and retained in the first flow channel 11b and / or the second flow channel 11c.

[0201] Therefore, by providing a plurality of blocking elements 81 in at least one of the first flow channel 11b and the second flow channel 11c, it is beneficial to further reduce the concentration of emissions and the content of harmful substances in the event of thermal runaway of the battery device 10, and further beneficial to reduce the pollution to the environment in the event of thermal runaway of the battery device 10.

[0202] In some embodiments, such as Figure 15 As shown, the processing mechanism 80 includes a liquid suction member 82, which is configured to absorb liquid in the first flow channel 11b and / or the second flow channel 11c.

[0203] Optionally, the absorbent element 82 may include foam, etc.

[0204] By setting up the liquid suction element 82, the liquid droplets in the discharge in the first flow channel 11b or the second flow channel 11c can be adsorbed, which is conducive to further reducing the concentration of discharge and the content of harmful substances in the discharge to the outside of the battery device 10, and further conducive to reducing environmental pollution in the event of thermal runaway of the battery device 10.

[0205] In some embodiments, the absorbent element 82 includes foam.

[0206] Foam is readily available and inexpensive, and it has good liquid absorption properties. Therefore, including foam in the liquid absorption component 82 not only improves the liquid absorption effect of the liquid absorption component 82, but also helps to reduce the production cost of the battery device 10.

[0207] In some embodiments, such as Figure 15 and Figure 16 As shown, the liquid suction member 82 is connected to the periphery of the inner wall of the first flow channel 11b and / or the second flow channel 11c, and has a third through hole 82a for allowing the discharge material to pass through the liquid suction member 82.

[0208] Optionally, the suction member 82 may have one, two, or more third through holes 82a, through which the discharge material can pass. Connecting the suction member 82 to the periphery of the inner wall of at least one of the first flow channel 11b and the second flow channel 11c improves the structural stability of the suction member 82. Furthermore, as the discharge material passes through the suction member 82, it collides with the suction member 82, making it easier for the droplets to be absorbed by the suction member 82.

[0209] Secondly, the electrical device provided in the embodiments of this application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0210] The power supply device provided in this application embodiment has the same technical effect as the battery device 10 provided in any of the above embodiments, and will not be described again here.

[0211] In some embodiments, such as Figures 2 to 16As shown, the battery device 10 provided in this embodiment includes a battery cell 30, a housing 11, a first pressure relief mechanism 40, a second pressure relief mechanism 50, a fourth pressure relief mechanism 60, a linkage mechanism 70, and a processing mechanism 80. The battery cell 30 includes a third pressure relief mechanism 34. The housing 11 has a receiving cavity 11a, in which the battery cell 30 is received. The housing 11 includes a first flow channel 11b and a second flow channel 11c, which are respectively connected to the receiving cavity 11a. The first pressure relief mechanism 40, the second pressure relief mechanism 50, and the fourth pressure relief mechanism 60 are disposed in the housing 11. The first flow channel 11b is configured to guide the emissions released from the third pressure relief mechanism 34 to the first pressure relief mechanism 40 for discharge from the housing. The second flow channel 11c is configured to guide the emissions released from the third pressure relief mechanism 34 to the second pressure relief mechanism 50 for discharge from the housing. The actuation pressure of the first pressure relief mechanism 40 is less than the actuation pressure of the second pressure relief mechanism 50, and the length of the shortest path of the first flow channel 11b is greater than the length of the shortest path of the second flow channel 11c. The actuation pressure of the fourth pressure relief mechanism 60 is greater than the actuation pressure of the first pressure relief mechanism 40, and less than or equal to the actuation pressure of the second pressure relief mechanism 50. The fourth pressure relief mechanism 60 is configured to guide emissions from the third pressure relief mechanism 34 to the first pressure relief mechanism 40 via the fourth pressure relief mechanism 60, and the length of the shortest path of the first flow channel 11b is greater than the length of the shortest path from the first pressure relief mechanism 40 to the receiving cavity 11a via the fourth pressure relief mechanism 60. The box body 11 includes a first beam 113 and a second beam 114. The first beam 113 has a first channel 113a, and the second beam 114 has a second channel 114a. The first channel 113a includes a plurality of first sub-channels 1131a. The plurality of first sub-channels 1131a extend along a first direction X and are arranged separately along a second direction Y. The first direction X intersects with the second direction Y. The plurality of first sub-channels 1131a are connected end to end at both ends of the first direction X. The first channel 11b and / or the second channel 11c include the first channel 113a. The second beam 114 includes a second channel 114a, which includes multiple second sub-channels 1141a. These multiple second sub-channels 1141a extend along a third direction Z and are arranged separately along a second direction Y. The second direction Y intersects with the third direction Z. The multiple second sub-channels 1141a are connected end-to-end at both ends of the third direction Z. The first channel 11b and / or the second channel 11c include the second channel 114a. The housing 11 includes a common channel 11d, which is also included in both the first channel 11b and the second channel 11c.The wall of the first flow channel 11b includes a first through hole 111b and a second through hole 112b. The fourth pressure relief mechanism 60 is movable relative to the first through hole 111b and the second through hole 112b to block or connect the first through hole 111b and the second through hole 112b. The path from the first through hole 111b to the second through hole 112b via the first flow channel 11b is longer than the path from the first through hole 111b to the second through hole 112b via the fourth pressure relief mechanism 60. The second pressure relief mechanism 50 includes a body portion 51 and a moving portion 52. The moving portion 52 is configured to move relative to the body portion 51 when the second pressure relief mechanism 50 is actuated. A linkage mechanism 70 connects the moving portion 52 and the fourth pressure relief mechanism 60. The moving portion 52 is configured to drive the fourth pressure relief mechanism 60 to move to block or connect the first through hole 111b and the second through hole 112b. The inner wall of the first flow channel 11b is provided with a protruding structure 115; and / or, the inner wall of the second flow channel 11c is provided with a protruding structure 115. The processing mechanism 80 includes a plurality of blocking members 81 and a liquid-absorbing member 82. The plurality of blocking members 81 are spaced apart along the extending direction of the first flow channel 11b and / or the second flow channel 11c. The blocking member 81 has a through hole for allowing discharge to pass through the blocking member 81. The blocking member 81 is configured to intercept some particles in the discharge within the first flow channel 11b and / or the second flow channel 11c. The liquid-absorbing member 82 is connected to the periphery of the inner wall of the first flow channel 11b and / or the second flow channel 11c and has a third through hole 82a for allowing discharge to pass through the liquid-absorbing member 82. The liquid-absorbing member 82 is configured to absorb liquid within the first flow channel 11b and / or the second flow channel 11c. The liquid-absorbing member 82 includes foam.

[0212] The battery device 10 provided in this application, by setting the braking pressure of the first pressure relief mechanism 40 to be less than the braking pressure of the second pressure relief mechanism 50, and setting the length of the shortest path of the first flow channel 11b to be greater than the length of the shortest path of the second flow channel 11c, allows for pressure relief through the first flow channel 11b and the first pressure relief mechanism 40 when the pressure in the accommodating cavity 11a is low. This allows the emissions to remain in the first flow channel 11b of the housing 11 for a longer period, facilitating thorough treatment of the emissions and reducing the concentration of emissions and the content of harmful substances discharged to the outside of the housing 11, thereby reducing environmental pollution. As the air pressure in the accommodating cavity 11a increases, pressure can be simultaneously relieved through the first pressure relief mechanism 40 and the second pressure relief mechanism 50, which helps to increase the rate of emission of emissions and the pressure drop rate in the accommodating cavity 11a, thus improving the reliability of the battery device 10.

[0213] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Battery cell; The housing has a receiving cavity, in which the battery cell is housed. The housing includes a first flow channel and a second flow channel, which are respectively connected to the receiving cavity. A first pressure relief mechanism and a second pressure relief mechanism are provided in the housing. The battery cell is provided with a third pressure relief mechanism. The first flow channel is configured to guide the discharge from the third pressure relief mechanism to the first pressure relief mechanism to discharge out of the housing. The second flow channel is configured to guide the discharge from the third pressure relief mechanism to the second pressure relief mechanism to discharge out of the housing. The actuation pressure of the first pressure relief mechanism is less than the actuation pressure of the second pressure relief mechanism, and the length of the shortest path of the first flow channel is greater than the length of the shortest path of the second flow channel.

2. The battery device according to claim 1, characterized in that, The housing includes a first beam having a first channel, and the first flow channel and / or the second flow channel includes the first channel.

3. The battery device according to claim 2, characterized in that, The first channel includes a plurality of first sub-channels, which extend along a first direction and are arranged separately along a second direction. The first direction intersects with the second direction, and the plurality of first sub-channels are connected end to end at both ends of the first direction.

4. The battery device according to claim 2, characterized in that, The box body further includes a second beam that intersects with the first beam. The second beam has a second channel that communicates with the first channel. The first flow channel and / or the second flow channel includes the second channel.

5. The battery device according to claim 4, characterized in that, The second channel includes a plurality of second sub-channels, which extend along a third direction and are arranged separately along a second direction. The second direction intersects with the third direction, and the plurality of second sub-channels are connected end to end at both ends of the third direction.

6. The battery device according to claim 1, characterized in that, The housing has a common flow channel, and both the first flow channel and the second flow channel include the common flow channel.

7. The battery device according to claim 1, characterized in that, The battery device further includes a fourth pressure relief mechanism, which is located in the housing, and the actuation pressure of the fourth pressure relief mechanism is greater than the actuation pressure of the first pressure relief mechanism. The fourth pressure relief mechanism is configured to guide emissions from the third pressure relief mechanism to the first pressure relief mechanism via the fourth pressure relief mechanism, wherein the length of the shortest path of the first flow channel is greater than the length of the shortest path from the first pressure relief mechanism to the receiving cavity via the fourth pressure relief mechanism.

8. The battery device according to claim 7, characterized in that, The actuation pressure of the fourth pressure relief mechanism is less than or equal to the actuation pressure of the second pressure relief mechanism.

9. The battery device according to claim 7, characterized in that, The wall of the first flow channel includes a first through hole and a second through hole. The fourth pressure relief mechanism is movable relative to the first through hole and the second through hole to block or connect the first through hole and the second through hole. The path from the first through hole to the second through hole via the first flow channel is greater than the path from the first through hole to the second through hole via the fourth pressure relief mechanism.

10. The battery device according to claim 9, characterized in that, The second pressure relief mechanism includes a body and a movable part, the movable part being configured to move relative to the body when the second pressure relief mechanism is actuated; The battery device further includes a linkage mechanism that connects the moving part and the fourth pressure relief mechanism. The moving part is configured to drive the fourth pressure relief mechanism to move in order to block or connect the first through hole and the second through hole.

11. The battery device according to claim 7, characterized in that, The battery device further includes a battery management system, which is electrically connected to the second pressure relief mechanism and the fourth pressure relief mechanism respectively. The battery management system is configured to issue actuation information to actuate the fourth pressure relief mechanism upon receiving a signal that the second pressure relief mechanism is actuated.

12. The battery device according to claim 1, characterized in that, The inner wall of the first flow channel is provided with a protruding structure; and / or, the inner wall of the second flow channel is provided with a protruding structure.

13. The battery device according to any one of claims 1 to 12, characterized in that, The battery device further includes a processing mechanism for adsorbing or intercepting the emissions, and the processing mechanism is disposed in the first flow channel and / or the second flow channel.

14. The battery device according to claim 13, characterized in that, The processing mechanism includes a blocking member disposed within the first flow channel and / or the second flow channel, and having a through hole for the emission to pass through the blocking member. The blocking member is configured to intercept a portion of the particles in the emission within the first flow channel and / or the second flow channel.

15. The battery device according to claim 14, characterized in that, The processing mechanism includes a plurality of blocking members, which are spaced apart along the extension direction of the first flow channel and / or the second flow channel.

16. The battery device according to claim 13, characterized in that, The processing mechanism includes a liquid suction element configured to absorb liquid within the first flow channel and / or the second flow channel.

17. The battery device according to claim 16, characterized in that, The liquid-absorbing component includes foam.

18. The battery device according to claim 16, characterized in that, The liquid suction element is connected to the periphery of the inner wall of the first flow channel and / or the second flow channel, and has a third through hole for the discharge material to pass through the liquid suction element.

19. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1 to 18, the battery device being used to provide electrical energy.

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