Battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, provides a battery device and electric equipment, and can solve the problem of thermal runaway protection. The battery device comprises a box body, single batteries and a box cover, the box body is provided with a containing cavity, and the containing cavity is provided with a first opening; the battery monomer is positioned in the accommodating cavity and comprises a pressure relief mechanism; the box cover is connected with the box body and covers the first opening, the box cover comprises a first wall facing the containing cavity in the first direction, a limiting body and a flame-retardant medium, the limiting body is located in the containing cavity and connected with the first wall, the first wall covers the limiting body in the first direction, and the flame-retardant medium is limited by the limiting body and is separated from the single batteries; and the limiting body is configured to release the limiting of at least part of the flame-retardant medium under the heat influence of the substance discharged by the pressure relief mechanism so as to release the flame-retardant medium.

Description

Technical Field

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

[0002] Battery devices consist of individual battery cells. Thermal runaway of individual battery cells can easily lead to problems such as heat accumulation, increased pressure, and structural damage to the battery device. In related technologies, thermal runaway protection for battery devices is relatively simple and cannot meet the requirements for rapid and efficient protection. Utility Model Content

[0003] This application provides a battery device and electrical equipment that can effectively mitigate the impact of thermal runaway of individual battery cells.

[0004] A first aspect of this application provides a battery device, including a housing, a battery cell, and a cover. The housing has a receiving cavity with a first opening. The battery cell is located in the receiving cavity and includes a pressure relief mechanism. The cover is connected to the housing and covers the first opening. The cover includes a first wall facing the receiving cavity in a first direction, a limiting body, and a flame-retardant medium. The limiting body is located in the receiving cavity and connected to the first wall. The first wall covers the limiting body in the first direction. The flame-retardant medium is limited by the limiting body and separated from the battery cell. The limiting body is configured to release the limiting body on at least a portion of the flame-retardant medium under the thermal effect of the substance discharged by the pressure relief mechanism, thereby releasing the flame-retardant medium.

[0005] The battery device provided in this application includes a housing and a cover. The housing has a receiving cavity with a first opening. The cover connects to the housing and covers the first opening to close the receiving cavity. The receiving cavity can accommodate individual battery cells. Each battery cell includes a pressure relief mechanism for discharging substances in the event of thermal runaway of the battery cell, thereby releasing the internal pressure of the battery cell. The cover includes a first wall extending towards the receiving cavity in a first direction. The cover also includes a limiting body and a flame-retardant medium. The limiting body is located within the receiving cavity and connected to the first wall. The flame-retardant medium is limited by the limiting body and separated from the battery cell, so that the limiting body confines the flame-retardant medium to the first wall. The limiting body is configured to release the limiting of at least a portion of the flame-retardant medium under the thermal effect of the substances discharged by the pressure relief mechanism, so that the flame-retardant medium can be released to the pressure relief mechanism location, achieving flame-retardant and fire-extinguishing effects. The battery device of this application integrates a limiting body and a flame-retardant medium on the cover so that the flame-retardant medium can be released in time under the thermal influence of the substances discharged by the pressure relief mechanism to achieve flame retardancy and fire extinguishing, thereby reducing the impact of thermal runaway at the source and effectively reducing the adverse effects of thermal runaway battery cells on surrounding battery cells.

[0006] In some embodiments of this application, the limiting body is connected to and encloses the first wall to form a receiving space, and the flame-retardant medium is disposed in the receiving space.

[0007] Here, the flame-retardant medium is placed in the receiving space enclosed by the limiting body and the first wall. The limiting body provides one-sided coverage for the flame-retardant medium. The structure is relatively simple, which facilitates the processing and manufacturing of the bearing part and also makes it easy to fill the receiving space with the flame-retardant medium.

[0008] In some embodiments of this application, the limiting body includes a supporting part and a connecting part, the connecting part connecting the first wall and the supporting part, and the connecting part surrounding the supporting part, and the flame retardant medium is located on the side of the supporting part away from the battery cell along the first direction.

[0009] Here, by setting a connecting part, it is easy to connect the bearing part to the first wall, thereby stabilizing the flame retardant medium on the first wall. Since the connecting part is set around the bearing part, on the one hand, the stability of the connection can be improved; on the other hand, the connecting part can seal the receiving space to isolate the flame retardant medium, reduce the possibility of flame retardant medium leakage, and also improve the effective life of the flame retardant medium.

[0010] In some embodiments of this application, the lid is provided with a receiving groove, the receiving groove including a second opening facing a limiting body, the limiting body covering at least a portion of the second opening to form a receiving space.

[0011] Here, by setting a receiving groove in the box cover, the receiving groove forms a receiving space, and the limiting body covers at least part of the second opening, the space occupied by the receiving space can be reduced, which facilitates the arrangement of various components in the receiving space.

[0012] In some embodiments of this application, a flame-retardant medium is attached to the limiting body.

[0013] Here, by attaching the flame-retardant medium to the limiting body, the limiting body can provide good restraint for the flame-retardant medium, and no additional space is needed to accommodate the flame-retardant medium, which helps to optimize space.

[0014] In some embodiments of this application, the limiting body has a plurality of receiving holes, and the flame-retardant medium is received in the receiving holes.

[0015] Here, the limiting body has multiple receiving holes to receive the flame retardant medium, so that the receiving holes cover the flame retardant medium, reduce the contact between the flame retardant medium and the outside world, and improve the effective life of the flame retardant medium.

[0016] In some embodiments of this application, at least two battery cells are provided, and on the same projection plane perpendicular to the first direction, the orthographic projection of the flame-retardant medium overlaps with the orthographic projection of at least two pressure relief mechanisms.

[0017] Here, on the same projection plane perpendicular to the first direction, the orthographic projection of the flame-retardant medium overlaps with the orthographic projection of at least two pressure relief mechanisms, so that when the flame-retardant medium is released, it can correspond to at least two pressure relief mechanisms, thereby increasing the coverage of the flame-retardant medium, simplifying the structure, and facilitating processing.

[0018] In some embodiments of this application, the housing includes a central beam located in the receiving cavity; a flame-retardant medium forms at least two covering areas in the receiving cavity, and a clearance space is provided between the at least two covering areas, the clearance space accommodating at least a portion of the central beam.

[0019] Here, a central beam is provided in the housing cavity of the box to improve the structural strength of the box. A clearance space is provided between at least two coverage areas of the flame-retardant medium. The clearance space can accommodate at least part of the central beam so that the flame-retardant medium and the limiting body can avoid the central beam, which facilitates the assembly of the box cover and the box body.

[0020] In some embodiments of this application, the pressure relief mechanism has a first dimension along a preset direction, and the area of ​​the limiting body with the flame-retardant medium has a second dimension along the preset direction, the second dimension being greater than or equal to the first dimension; wherein, the preset direction is perpendicular to the first direction.

[0021] Here, the area of ​​the limiting body containing the flame-retardant medium has a second dimension, which is greater than or equal to the first dimension of the pressure relief mechanism, so that the flame-retardant medium released when the limiting body is released can cover the entire pressure relief mechanism, thereby optimizing the coverage area of ​​the flame-retardant medium and improving the flame-retardant extinguishing effect.

[0022] In some embodiments of this application, the limiting body includes a first layer and a second layer, the melting point of the first layer is greater than that of the second layer, and the second layer is disposed between the first layer and the first wall; the flame retardant medium is embedded in the second layer, or the flame retardant medium is disposed between the second layer and the first wall.

[0023] Here, the limiting body is set as a stacked structure of a first layer and a second layer. The first layer is set close to the pressure relief mechanism, and the flame retardant medium is embedded in the second layer, or the flame retardant medium is set between the second layer and the first wall. Since the melting point of the first layer is greater than that of the second layer, the second layer will melt and break before the first layer, so as to form a gradient rupture process, which is convenient to match the thermal runaway process of the battery cell.

[0024] In some embodiments of this application, the battery device further includes a protective plate disposed between the box cover and the battery cell; the protective plate has a first through hole at the position corresponding to the pressure relief mechanism, and a flame-retardant medium covers the pressure relief mechanism along the axial direction of the first through hole.

[0025] Here, a protective plate is provided between the cover and the battery cell. The protective plate can protect the battery cell and increase the structural strength of the battery device. A first through hole is opened at the position of the pressure relief mechanism on the protective plate. The flame retardant medium covers the pressure relief mechanism along the axial direction of the first through hole so that when the limiting body is released, the flame retardant medium can pass through the first through hole and be released to the pressure relief mechanism position, thus taking into account both the structural strength of the battery device and the convenience of flame retardancy.

[0026] In some embodiments of this application, the battery device further includes a busbar configured to electrically connect two different battery cells; a protective plate covers the busbar along a first direction.

[0027] Here, the busbar facilitates the series or parallel connection of multiple battery cells. Along the first direction, the protective plate covers the busbar so that the protective plate can provide protection and shielding for the busbar, which can reduce the possibility of flame retardant media falling on the location of the busbar.

[0028] In some embodiments of this application, there are at least two battery cells, and the at least two battery cells are arranged sequentially along a second direction to form a battery cell assembly. The second direction is perpendicular to the first direction. Along the second direction, the protective plate is provided with at least two first through holes, and at least one first through hole corresponds to at least two pressure relief mechanisms.

[0029] Here, along the arrangement direction of the battery cells in the battery cell assembly, the protective plate is provided with at least two first through holes in sequence, so that there is still a connection structure between two adjacent first through holes, reducing the impact of the first through holes on the structural strength of the protective plate. The first through hole can correspond to at least two pressure relief mechanisms, so as to increase the coverage area of ​​a single first through hole, thereby taking into account both the structural strength of the protective plate and the ease of use of the first through hole.

[0030] In some embodiments of this application, the housing includes a first beam, the first beam being provided with an airflow channel, the airflow channel being connected to the receiving cavity, and a filter medium being provided inside the airflow channel.

[0031] Here, by setting an airflow channel in the first beam, the airflow formed by the material discharged by the pressure relief mechanism is quickly guided to the outside of the box, and the airflow can be isolated from other battery cells; the filter medium set in the airflow channel can effectively filter harmful substances in the airflow and improve the harmlessness standard of the battery device.

[0032] In some embodiments of this application, the first beam includes a second wall facing the first wall and a third wall facing the receiving cavity, wherein at least one of the second wall and the third wall is provided with a first channel hole, the first channel hole communicating with the airflow channel and the receiving cavity.

[0033] Here, a first channel hole is provided on the second wall of the first beam to facilitate the airflow formed by the material discharged from the cavity pressure relief mechanism entering the airflow channel through the gap between the first and second walls; a first channel hole is provided on the third wall of the first beam to facilitate the airflow formed by the material discharged from the cavity pressure relief mechanism entering the airflow channel directly from the inside of the first wall.

[0034] In some embodiments of this application, a separator is provided in the airflow channel to divide the airflow channel into at least two sub-channels, and the at least two sub-channels are connected.

[0035] Here, by setting a separator in the airflow channel, on the one hand, it can provide support for the outer wall of the first beam and improve the structural strength of the first beam; on the other hand, the separator divides the airflow channel into multiple sub-channels and connects them, which helps to extend the filtration path of the material discharged by the pressure relief mechanism and improve the filtration effect.

[0036] A second aspect of this application provides an electrical device, including the battery device of the first aspect, the battery device being used to provide electrical energy.

[0037] The electrical equipment provided in this application includes a battery device of the first aspect. The battery device integrates a limiting body and a flame-retardant medium on the cover so that the flame-retardant medium can be released in time under the thermal influence of the substances discharged by the pressure relief mechanism to achieve flame retardancy and fire extinguishing, thereby reducing the impact of thermal runaway at the source and effectively reducing the adverse effects of thermal runaway battery cells on surrounding battery cells. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of the electrical equipment according to an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the battery device according to an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the structure of a single battery cell in the battery device of this application embodiment;

[0043] Figure 4 This is one of the structural schematic diagrams of the battery pack cover in an embodiment of this application;

[0044] Figure 5 Examples of embodiments of this application Figure 4 Schematic diagram of the cross-sectional structure along the middle edge BB;

[0045] Figure 6 This is a schematic diagram of the structure of the flame-retardant medium adhering to the limiting body in the battery device according to an embodiment of this application;

[0046] Figure 7 This is a second schematic diagram of the structure of the battery pack cover in an embodiment of this application;

[0047] Figure 8 This is a schematic cross-sectional view of the limiting body and flame-retardant medium in the battery device according to an embodiment of this application;

[0048] Figure 9 Examples of embodiments of this application Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0049] Figure 10 This is a schematic cross-sectional view of the limiting body in the battery device according to an embodiment of this application;

[0050] Figure 11 This is a schematic diagram of the structure of the battery device with a protective plate according to an embodiment of this application;

[0051] Figure 12 Examples of embodiments of this application Figure 11 A magnified schematic diagram of the structure at point C in the middle;

[0052] Figure 13 Examples of embodiments of this application Figure 11 Schematic diagram of the cross-sectional structure along the middle DD;

[0053] Figure 14 This is a schematic diagram of the cross-sectional structure of the first side beam in the battery device according to an embodiment of this application;

[0054] Figure 15 Examples of embodiments of this application Figure 11 Schematic diagram of the cross-sectional structure along the middle EE;

[0055] Figure 16 Examples of embodiments of this application Figure 15 A magnified schematic diagram of the structure at point F in the middle.

[0056] Explanation of reference numerals in the attached figures:

[0057] 100 - Housing; 110 - Receiving cavity; 111 - First opening; 10A - First beam; 101 - Second wall; 102 - Third wall; 103 - First channel hole; 104 - Separator; 105 - Second channel hole; 120 - First side beam; 130 - Second side beam; 140 - Middle beam; 150 - Airflow channel; 151 - Sub-channel; 160 - Pressure relief structure; 200 - Housing cover; 210 - First wall; 220 - Receiving slot; 300 - Battery cell; 310 - Pressure relief mechanism; 320 - Outer shell; 330 - End cap; 340 - Electrode assembly; 410 - Limiting body; 411 - Supporting part; 412 - Connecting part; 413 - First layer; 414 - Second layer; 420 - Flame retardant medium; 430 - Filter medium; 500 - Protective plate; 510 - First through hole; 520 - Partition; 600 - Busbar; 700 - Accommodation space; 800 - Clearance space; 900 - Power unit; W1 - First dimension; W2 - Second dimension; Z - First direction; X - Second direction; Y - Third direction. Detailed Implementation

[0058] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0059] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0062] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0064] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0067] The following is a detailed description of this application.

[0068] Battery devices consist of individual battery cells. Thermal runaway of individual battery cells is a common problem in battery devices. The causes of thermal runaway in individual battery cells are as follows: 1. Internal short circuit: Due to manufacturing defects, mechanical damage, or abnormal chemical reactions, the positive / negative electrodes of the battery cell may come into direct contact, causing a rapid increase in current and generating a large amount of heat. 2. Overcharging or over-discharging: If the voltage or current of the battery cell exceeds the design range during charging or discharging, it may lead to the decomposition of electrode materials or electrolyte, releasing a large amount of heat. 3. Excessive temperature: Excessive ambient temperature or poor heat dissipation during battery cell operation can cause the internal temperature of the battery cell to gradually rise. 4. Manufacturing defects: During the production process, battery cells may have problems such as micro-short circuits, residual impurities, or uneven structure. These problems may lead to localized overheating during battery cell operation. 5. External factors: If the battery cell is subjected to external impact, direct contact with open flame, or prolonged exposure to high-temperature environments, it may also trigger thermal runaway.

[0069] Thermal runaway typically occurs as a chain reaction, involving the following stages: 1. Temperature rise: Due to internal short circuits, overcharging, or other reasons, heat is generated inside the battery cell, causing the temperature to gradually rise; 2. Increased chemical reaction: As the temperature rises, the chemical reactions inside the battery (such as lithium dendrite growth and electrolyte decomposition) accelerate, further generating heat; 3. Heat release: Heat accumulates inside the battery cell, leading to a further increase in temperature, creating a vicious cycle; 4. Increased pressure: Gases (such as carbon dioxide and hydrogen) are generated inside the battery cell at high temperatures, causing a sharp increase in internal pressure; 5. Thermal runaway: When the pressure and temperature reach critical values, the battery cell may rupture or explode, releasing a large amount of energy.

[0070] In summary, thermal runaway is essentially an uncontrollable chemical reaction occurring inside a battery cell, causing a rapid rise in the cell's temperature. Simultaneously, the electrolyte decomposes, releasing a large amount of gas, which in turn causes a sharp increase in internal pressure. When the internal pressure reaches a critical value, the gas will enter the battery pack's containment cavity through the cell's pressure relief mechanism. If this gas cannot be released in time, it will cause multiple hazards to the battery pack and the surrounding environment.

[0071] 1. Heat accumulation: Gases that are not released in time accumulate inside the battery device, hindering normal heat dissipation and causing a continuous rise in local temperature, further exacerbating thermal runaway. This can lead to more serious fire accidents, or even cause the entire battery device to burn or explode. 2. Pressure increase: As gases continue to accumulate, the internal pressure of the battery device continues to rise. If it exceeds its structural tolerance limit, it may cause the battery device to rupture or even explode. 3. Structural damage: High temperature and high pressure can not only damage the battery device's packaging structure, but may also affect the overall integrity of the battery device, leading to electrolyte leakage. Electrolyte is highly corrosive and flammable. Once leaked, it will not only pollute the environment, but may also cause secondary fires or explosions.

[0072] In related technologies, thermal runaway protection for battery devices is relatively simple and cannot quickly and effectively prevent the spread of thermal runaway, making it difficult to meet the rapid and efficient protection requirements of battery devices.

[0073] This application discloses a battery device and an electrical appliance. The battery device has a limiting body and a flame-retardant medium integrated on its cover. The limiting body attaches the flame-retardant medium to the cover so that it can be released in time under the thermal influence of the substances discharged by the pressure relief mechanism to retard and extinguish the fire. This reduces the impact of thermal runaway at the source and can effectively reduce the adverse effects of thermal runaway battery cells on surrounding battery cells.

[0074] Electrical equipment can include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, cars, ships, spacecraft, etc. Among them, 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.

[0075] The battery device disclosed in this application can be used in electrical equipment that uses batteries as a power source, or as an energy storage device. The energy storage device includes energy storage containers, energy storage cabinets, etc.

[0076] In the following embodiments, for ease of explanation, an example of an electrical device according to an embodiment of this application is a vehicle.

[0077] Figure 1 The diagram illustrates the structure of a vehicle as provided in some embodiments of this application. The vehicle 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 vehicles, etc. Figure 1As shown, a battery pack is installed inside the vehicle, which can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller controls the battery pack's power supply to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving.

[0078] In some embodiments of this application, the battery device can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0079] Figure 2 This is an exploded view of a battery device provided in some embodiments of this application; the battery device mentioned in the embodiments of this application may also include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 300, which are connected in series, parallel, or mixed connections via busbars.

[0080] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 300.

[0081] As an example, a battery cell assembly can be a battery module, which consists of multiple battery cells 300 arranged and fixed to form an independent module.

[0082] As an example, a battery module can be formed by bundling multiple battery cells 300 together with cable ties.

[0083] In some embodiments, such as Figure 2 As shown, the battery device can be a battery pack, which includes a housing 100 and one or more battery cell assemblies housed within a cavity.

[0084] As an example, the battery cell assembly can be a battery module, which can be housed within the cavity by fixing the battery module within the cavity.

[0085] As an example, the battery cell assembly can also be housed in the cavity by directly fixing multiple battery cells 300 to the cavity.

[0086] As an example, such as Figure 2As shown, the housing 100 may include a first housing 100 part and a second housing 100 part. The first housing 100 part and the second housing 100 part are fastened together to form a closed space, or cavity, inside the housing 100 to house the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 100 part may be a top cover or a bottom plate.

[0087] In some embodiments, the housing 100 may be part of the vehicle's chassis structure. For example, a portion of the housing 100 may be at least a portion of the vehicle's floor, or a portion of the housing 100 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0088] In this embodiment of the application, the battery cell 300 can be a secondary battery. A secondary battery refers to a battery cell 300 that can be used again after being discharged by recharging to activate the active materials.

[0089] The battery cell 300 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0090] Additionally, by way of example, the battery cell 300 can be a cylindrical battery cell 300, a prismatic battery cell 300, a pouch battery cell 300, or a battery cell 300 of other shapes. The prismatic battery cell 300 includes a square battery cell, a blade-shaped battery cell, and a multi-prismatic battery cell. For example, a hexagonal prismatic battery cell is a multi-prismatic battery cell. There are no particular limitations in the embodiments of this application.

[0091] Reference Figure 3 In some embodiments, the housing 320 includes an end cap 330 and a housing with an opening. The end cap 330 closes the opening to form a sealed space for accommodating the electrode assembly 340 and substances such as electrolytes. The housing may have one or more openings. The end cap 330 may also be provided in one or more manner.

[0092] In some embodiments, at least one electrode terminal is provided on the housing 320, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through an adapter. The electrode terminal can be provided on the end cap 330 or on the housing.

[0093] In some embodiments, a pressure relief mechanism is provided on the housing 320. The pressure relief mechanism is used to release the internal pressure of the battery cell 300.

[0094] A battery cell 300 typically includes an electrode assembly 340. The electrode assembly 340 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 300, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits while allowing active ions to pass through.

[0095] In some embodiments, the electrode assembly 340 further includes an isolator disposed between the positive and negative electrodes.

[0096] In some embodiments, the separator 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.

[0097] As an example, the material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0098] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0099] In some embodiments, the battery cell 300 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0100] In some embodiments, the electrode assembly 340 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0101] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0102] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0103] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0104] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0105] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0106] In some embodiments, the electrode assembly 340 may be cylindrical, flat, or polygonal in shape.

[0107] In some embodiments, the electrode assembly 340 is provided with tabs that can conduct current from the electrode assembly 340. The tabs include a positive tab and a negative tab.

[0108] Reference Figure 2 , Figure 4 and Figure 5 This application provides a battery device including a housing 100, a battery cell 300, and a cover 200. The housing 100 has a receiving cavity 110 with a first opening 111. The battery cell 300 is located in the receiving cavity 110 and includes a pressure relief mechanism 310. The cover 200 is connected to the housing 100 and covers the first opening 111. The cover 200 includes a first wall 210 facing the receiving cavity 110 in a first direction Z, a limiting body 410, and a flame-retardant medium 420. The limiting body 410 is located in the receiving cavity 110 and connected to the first wall 210. The first wall 210 covers the limiting body 410 in the first direction Z. The flame-retardant medium 420 is limited by the limiting body 410 and separated from the battery cell 300. The limiting body 410 is configured to release the limiting of at least a portion of the flame-retardant medium 420 under the thermal influence of the substance discharged by the pressure relief mechanism 310, thereby releasing the flame-retardant medium 420.

[0109] The technical solution of this application embodiment includes a battery device comprising a housing 100 and a cover 200. The housing 100 is provided with a receiving cavity 110, which has a first opening 111. The cover 200 is connected to the housing 100 and covers the first opening 111 to close the receiving cavity 110. The receiving cavity 110 can accommodate a battery cell 300. The battery cell 300 includes a pressure relief mechanism 310, which is used to discharge substances when the battery cell 300 experiences thermal runaway, so as to release the internal pressure of the battery cell 300.

[0110] Based on this, the cover 200 includes a first wall 210 facing the receiving cavity 110 along the first direction Z. The cover 200 also includes a limiting body 410 and a flame-retardant medium 420. The limiting body 410 is located inside the receiving cavity 110 and connected to the first wall 210. The flame-retardant medium 420 is limited by the limiting body 410 and separated from the battery cell 300, so that the limiting body 410 limits the flame-retardant medium 420 to the first wall 210. The limiting body 410 is configured to release the limiting of at least part of the flame-retardant medium 420 under the thermal influence of the substance discharged by the pressure relief mechanism 310, so that the flame-retardant medium 420 can be released to the position of the pressure relief mechanism 310, so as to play a role in flame retardancy and fire extinguishing.

[0111] The battery device of this application integrates a limiting body 410 and a flame-retardant medium 420 on the cover 200, so that the flame-retardant medium 420 can be released in time under the thermal influence of the substances discharged by the pressure relief mechanism 310 to achieve flame retardancy and fire extinguishing, thereby weakening the impact of thermal runaway at the source and effectively reducing the adverse effects of thermal runaway battery cell 300 on surrounding battery cells 300.

[0112] The battery device using the embodiments of this application can quickly and effectively discharge the thermal runaway gas from the battery device, treat the harmful gases released during the thermal runaway process, enhance gas purification, emission control and system protection, and improve the flame retardant performance and environmental friendliness of the battery device.

[0113] In this embodiment, the cross-sectional profile of the box 100 can be a regular or irregular shape such as a circle, ellipse, triangle, rectangle, rhombus, trapezoid, or hexagon. In some examples, the box 100 is a cuboid structure, with the height direction of the box 100 being the first direction Z, the length direction of the box 100 being the second direction X, and the width direction of the box 100 being the third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other, and the first opening 111 of the receiving cavity 110 is parallel to the plane formed by the second direction X and the third direction Y.

[0114] It should be noted that one or more battery cells 300 can be disposed within the receiving cavity 110, and multiple battery cells 300 can form a battery cell assembly. In some examples, multiple battery cell assemblies are disposed within the receiving cavity 110, and the multiple battery cell assemblies are arranged sequentially along a third direction Y. The multiple battery cells 300 in the battery cell assembly are arranged sequentially along a second direction X. The battery cells 300 are prismatic batteries, the thickness direction of the battery cells 300 is set along the second direction X, and the height direction of the battery cells 300 is set along the first direction Z.

[0115] In some examples, the cavity 110 contains multiple battery cells 300, and the cover 200 is connected to multiple limiting bodies 410. Each limiting body 410 is fixed with a flame-retardant medium 420. The positions and numbers of the limiting bodies 410 and the pressure relief mechanisms 310 are set in a one-to-one correspondence. Alternatively, the limiting bodies 410 are set with at least two pressure relief mechanisms 310 to simplify the structure.

[0116] It should be noted that the cover 200 has a top wall and may also have side walls. The side walls and top walls of the cover 200 form an angle, and both the top wall and side walls are the inner walls of the cover 200. The top wall of the cover 200 is positioned opposite to the end cap 330 of the battery cell 300.

[0117] In some examples, the top wall of the cover 200 forms a first wall 210, which is located above the battery cell 300. This corresponds to the case where the pressure relief mechanism 310 is located on the end cover 330, which facilitates the spraying of the flame retardant medium 420 onto the pressure relief mechanism 310.

[0118] In some examples, since the first wall 210 covers the limiting body 410 in the direction toward the receiving cavity 110 (first direction Z), the portion of the first wall 210 corresponding to the limiting body 410 is provided with a solid structure, which facilitates the connection between the limiting body 410 and the first wall 210.

[0119] In this embodiment, the limiting body 410 can be a rigid structure, a flexible structure, or an elastic structure. Rigid structures are easy to shape and connect, while flexible and elastic structures have better shape adaptability. The limiting body 410 can be a single-layer structure or a multi-layer composite structure. In some examples, the limiting body 410 is a flexible membrane structure, which has good shape adaptability and is convenient for wrapping particulate flame-retardant medium 420.

[0120] In some examples, the limiting body 410 is a continuous structure over its entire surface; in other examples, the limiting body 410 can be provided with multiple microporous structures, the pore size of which is smaller than the particle size of the flame retardant medium 420. For example, micron-sized pores can be formed on the limiting body 410 by laser drilling or micro-extrusion processes, with the pore size set in the range of 10μm-50μm and the porosity controlled at 10%-20%, so that gas can penetrate the limiting body 410 in the event of thermal runaway but the flame retardant does not leak prematurely.

[0121] In this embodiment, the connection between the limiting body 410 and the first wall 210 can be a non-removable connection such as bonding, welding, or riveting, or a detachable connection such as snap-fit, threaded connection, or fastener connection. In some examples, the limiting body 410 is bonded and fixed to the first wall 210.

[0122] For example, the limiting body 410 needs to form an airtight bond with the box cover 200 and keep the release channel unobstructed. The bonding process can be: the limiting body 410 is attached to the first wall 210 of the box cover 200 by vacuum adsorption combined with hot pressing molding process.

[0123] In some examples, the limiting body 410 is a thermosensitive phase change film, such as polyethylene terephthalate (PET) or polyphenylene sulfide (PPS). PET has a melting point of 250-260°C, and PPS has a melting point of 285°C. The limiting body 410 is bonded to the first wall 210 via an adhesive layer. The adhesive layer uses silicone adhesive or hot melt pressure-sensitive adhesive (HMA). The decomposition temperature of the adhesive layer is higher than the normal operating temperature of the battery cell 300 but lower than the thermal runaway trigger temperature. For example, polyurethane hot melt adhesive has a decomposition temperature of 200-250°C.

[0124] In this embodiment, the battery pack cover 200 integrates a flame retardant medium 420. The flame retardant medium 420 can be a material with fire extinguishing or flame retardant properties. The position of the flame retardant medium 420 integrated in the cover 200 corresponds to the position of the pressure relief mechanism 310 in the battery cell 300. In the event of thermal runaway of the battery cell 300, the limiting body 410 releases the flame retardant medium 420 after sensing the ejected gas. The flame retardant medium 420 is sprayed onto the corresponding pressure relief mechanism 310 position to reduce the temperature of the gas at the pressure relief mechanism 310 and slow down the intensity of the reaction at the pressure relief mechanism 310 position. In addition, the flame retardant medium 420 can also encapsulate and settle particulate matter in the gas to remove solid harmful substances.

[0125] It should be noted that the limiting body 410's limiting of the flame-retardant medium 420 means that, under the constraint of the limiting body 410, the flame-retardant medium 420 and the first wall 210 remain relatively fixed. The limiting body 410 is configured to release the limiting of at least a portion of the flame-retardant medium 420 under the thermal influence of the substance discharged from the pressure relief mechanism 310. This can be achieved by the limiting body 410 rupturing under the impact force of the substance discharged from the pressure relief mechanism 310, or by the substance discharged from the pressure relief mechanism 310 melting the limiting body 410 through high temperature.

[0126] In some examples, the rupture of the retainer 410 is achieved by thermal melting. The melting point of the retainer 410 is lower than the temperature of the gas ejected from the pressure relief mechanism 310. The gas heats the retainer 410 to its melting point, causing it to rupture due to the high temperature and create a gap, releasing the flame-retardant medium 420. For example, the rupture triggering of the retainer 410 is based on the principle of thermosensitive phase change, and the melting point of the retainer 410 matches the thermal runaway temperature of the battery cell 300.

[0127] In other examples, the rupture of the retainer 410 is achieved by an impact force. The structural strength of the retainer 410 is designed based on the impact force generated by the gas ejected from the pressure relief mechanism 310. The impact force of the gas tears the retainer 410 to create a gap, thereby releasing the flame retardant medium 420.

[0128] In some other examples, the rupture of the retainer 410 is achieved through a chemical reaction. The material of the retainer 410 is configured to react chemically with the gas ejected from the pressure relief mechanism 310, thereby changing the properties of the retainer 410, such as reducing the hardness of the retainer 410, so that the retainer 410 ruptures and releases the flame-retardant medium 420.

[0129] In this embodiment of the application, the flame retardant medium 420 can achieve flame retardancy or fire extinguishing in various ways. For example, the flame retardant medium 420 is rapidly released under the action of high temperature gas and covers the pressure relief mechanism 310, thereby inhibiting the thermal runaway diffusion through heat absorption, oxygen isolation, and inhibition of chemical chain reaction.

[0130] It should be noted that the flame retardant medium 420 can be a solid medium, a liquid medium, or a gaseous medium. In some examples, the flame retardant medium 420 is a solid particulate matter with a particle size controlled between 1 micrometer (μm) and 5 μm, which can improve the specific surface area and reactivity. The flame retardant medium 420 may include inorganic flame retardants, gas inhibitors, and binders.

[0131] In some examples, inorganic flame retardants include one or more of aluminum hydroxide (ATH), antimony trioxide (Sb2O3), and ammonium polyphosphate (APP). ATH has a decomposition temperature of 200-300℃ and an endothermic value of 1960J / g; Sb2O3 catalyzes char formation, enhancing the oxygen barrier effect; and APP is an intumescent flame retardant that forms a char layer to isolate oxygen.

[0132] In some examples, the gas suppressant includes sodium bicarbonate (NaHCO3), which decomposes upon heating to produce CO2, thus suppressing the flame; the binder includes waterborne polyurethane or polyvinyl alcohol (PVA), which is able to form a uniform coating after the flame retardant medium 420 is released.

[0133] Reference Figure 5 , Figure 7 and Figure 8 In some embodiments of this application, the limiting body 410 includes a receiving space 700 connected to and enclosed by the first wall 210, and the flame retardant medium 420 is disposed in the receiving space 700.

[0134] In the technical solution of this application embodiment, the flame retardant medium 420 is disposed in the accommodating space 700 formed by the limiting body 410 and the first wall 210. The limiting body 410 provides one-sided coverage for the flame retardant medium 420. The structure is relatively simple, which facilitates the processing and manufacturing of the bearing part 411 and also facilitates filling the accommodating space 700 with the flame retardant medium 420.

[0135] Reference Figure 5 and Figure 8 In some embodiments of this application, the limiting body 410 includes a supporting part 411 and a connecting part 412. The connecting part 412 connects the first wall 210 and the supporting part 411, and the connecting part 412 is arranged around the supporting part 411. The flame retardant medium 420 is located on the side of the supporting part 411 away from the battery cell 300 along the first direction Z.

[0136] In this embodiment, the shape of the supporting part 411 includes, but is not limited to, regular or irregular shapes such as circles, ellipses, triangles, rectangles, rhombuses, trapezoids, and hexagons. The supporting part 411 can be a single-layer or multi-layer composite structure. The technical solution of this embodiment, by providing a connecting part 412, facilitates the connection between the supporting part 411 and the first wall 210, thereby stabilizing the flame-retardant medium 420 on the first wall 210. Since the connecting part 412 is arranged around the supporting part 411, on the one hand, it can improve the stability of the connection; on the other hand, the connecting part 412 can seal the accommodating space 700 to isolate the flame-retardant medium 420, reduce the possibility of leakage of the flame-retardant medium 420, and also improve the effective lifespan of the flame-retardant medium 420.

[0137] In some examples, the connecting portion 412 is a ring structure, with the connecting portion 412 encircling the outer edge of the supporting portion 411; in other examples, there are multiple connecting portions 412, which are arranged sequentially to form a ring structure and encircle the outer edge of the supporting portion 411.

[0138] In some examples, the connecting portion 412 and the supporting portion 411 are integrally formed, and the connecting portion 412 and the supporting portion 411 have the same structural form. For example, the limiting body 410 is an integrally formed membrane structure, and an adhesive layer is coated on the connecting portion 412, which is bonded to the first wall 210.

[0139] Reference Figure 5 In some embodiments of this application, the lid 200 is provided with a receiving groove 220, the receiving groove 220 including a second opening facing the limiting body 410, the limiting body 410 covering at least a portion of the second opening to form a receiving space 700.

[0140] The technical solution of this application embodiment, by providing a receiving groove 220 in the box cover 200, forming a receiving space 700, and the limiting body 410 covering at least a portion of the second opening, can reduce the occupancy of the internal space of the receiving cavity 110 in the receiving space 700, and facilitate the arrangement of various components in the receiving cavity 110.

[0141] In some examples, the receiving space 700 is formed by the receiving groove 220, and the flame retardant medium 420 is located in the receiving groove 220; in other examples, the receiving groove 220 forms part of the receiving space 700, and the other part of the receiving space 700 is formed by the gap between the limiting body 410 and the first wall 210.

[0142] In some examples, the receiving groove 220 is used to receive at least a portion of the limiting body 410, which can be connected to the inner wall of the receiving groove 220, thereby reducing the space occupied by the limiting body 410 in the receiving cavity 110. In addition, the first wall 210 can also have a groove to receive the limiting body 410 so that the limiting body 410 and the first wall 210 can be flush.

[0143] In some examples, the cover 200 is provided with multiple receiving slots 220, which correspond one-to-one with multiple pressure relief mechanisms 310. Alternatively, at least some of the receiving slots 220 may correspond to at least two pressure relief mechanisms 310. It should be noted that the number of receiving slots 220 and the number of limiting bodies 410 may be the same or different.

[0144] In other embodiments of this application, the lid 200 does not have a receiving groove 220, and the space between the limiting body 410 and the first wall 210 forms a receiving space 700. Alternatively, the limiting body 410 forming the receiving space 700 may include a flame-retardant material. This arrangement allows the limiting body 410 to adapt to lids 200 with different structures.

[0145] In other embodiments of this application, the accommodating space 700 is formed by the limiting body 410, the accommodating space 700 is the internal space of the limiting body 410, the flame retardant medium 420 is wrapped by the limiting body 410, and the limiting body 410 isolates the flame retardant medium 420 from the first wall 210, so as to provide good sealing for the flame retardant medium 420 and reduce the mutual influence between the flame retardant medium 420 and the box cover 200.

[0146] Reference Figure 6 In some embodiments of this application, flame retardant medium 420 is attached to limiting body 410.

[0147] The technical solution of this application embodiment attaches the flame retardant medium 420 to the limiting body 410 so that the limiting body 410 can provide good limiting for the flame retardant medium 420, and no additional space is needed to accommodate the flame retardant medium 420, which helps to optimize space.

[0148] In some examples, the surface of the retainer 410 is provided with adhesive, and the flame retardant medium 420 is bonded and fixed to the retainer 410 by the adhesive; in other examples, the retainer 410 has a porous structure, and the flame retardant medium 420 is filled in the voids of the retainer 410.

[0149] Reference Figure 6 In some embodiments of this application, the limiting body 410 forms a plurality of receiving holes, and the flame retardant medium 420 is received in the receiving holes.

[0150] In the technical solution of this application embodiment, the limiting body 410 is formed with multiple receiving holes, and the flame retardant medium 420 is received through the receiving holes so that the receiving holes cover the flame retardant medium 420, reducing the contact between the flame retardant medium 420 and the outside world, and improving the effective life of the flame retardant medium 420.

[0151] In some examples, the limiting body 410 can be configured as a porous structure, and the flame retardant medium 420 is contained in the receiving hole of the limiting body 410 by filling; in other examples, the limiting body 410 and the flame retardant medium 420 are integrally formed, and the limiting body 410 forms a structure including the flame retardant medium 420.

[0152] Reference Figure 2 and Figure 4 In some embodiments of this application, at least two battery cells 300 are provided, and on the same projection plane perpendicular to the first direction Z, the orthographic projection of the flame retardant medium 420 overlaps with the orthographic projection of at least two pressure relief mechanisms 310.

[0153] In the technical solution of this application embodiment, on the same projection plane perpendicular to the first direction Z, the orthographic projection of the flame retardant medium 420 overlaps with the orthographic projection of at least two pressure relief mechanisms 310, so that when the flame retardant medium 420 is released, it can correspond to at least two pressure relief mechanisms 310, thereby increasing the coverage of the flame retardant medium 420, simplifying the structure, and facilitating processing.

[0154] In some examples, the direction of the first wall 210 toward the battery cell 300 is parallel to the first direction Z. The orthographic projection of the surface of the first wall 210 toward the first direction Z overlaps with the orthographic projection of at least two pressure relief mechanisms 310. The flame retardant material carried by a single bearing 411 can be released to the location of at least two pressure relief mechanisms 310.

[0155] In some examples, the flame retardant medium 420 can cover at least two pressure relief mechanisms 310 along the second direction X, that is, the flame retardant medium 420 covers multiple battery cells 300 in the same battery cell assembly; in other examples, the flame retardant medium 420 can cover at least two pressure relief mechanisms 310 along the third direction Y, that is, the carrier portion 411 covers multiple battery cells 300 in different battery cell assemblies.

[0156] Reference Figure 2 and Figure 4 In some embodiments of this application, at least two battery cells 300 are arranged sequentially to form a battery cell assembly, and the support portion 411 extends to both ends of the battery cell assembly along the arrangement direction of the battery cells 300 in the battery cell assembly.

[0157] In the technical solution of this application embodiment, along the arrangement direction of the battery cells 300 in the battery cell assembly, the supporting part 411 extends to both ends of the single cell assembly, so that a single limiting body 410 and the corresponding flame retardant medium 420 can cover the entire battery cell assembly, thereby simplifying the structure and facilitating processing.

[0158] In some examples, at least two battery cells 300 are arranged sequentially along the second direction X to form a battery cell assembly, wherein the battery cells 300 in the battery cell assembly are arranged in the second direction X, and the support portion 411 extends along the second direction X to both ends of the battery cell assembly so that the support portion 411 can cover the pressure relief mechanism 310 of the entire battery cell assembly.

[0159] In other embodiments of this application, the first wall 210 is provided with at least two support portions 411 for each battery cell assembly. The at least two support portions 411 are arranged sequentially along the arrangement direction of the battery cells 300 in the battery cell assembly. A connecting portion 412 can be provided between two adjacent support portions 411 so that the connection between the limiting body 410 and the first wall 210 is more stable.

[0160] Reference Figure 2 and Figure 7 In some embodiments of this application, the housing 100 includes a central beam 140 located in the receiving cavity 110; the flame-retardant medium 420 forms at least two covering areas in the receiving cavity 110, and a clearance space 800 is provided between the at least two covering areas, the clearance space 800 accommodating at least a portion of the central beam 140.

[0161] In the technical solution of this application embodiment, the central beam 140 is provided in the receiving cavity 110 of the box 100 to improve the structural strength of the box 100. An avoidance space 800 is provided between at least two covering areas of the flame retardant medium 420. The avoidance space 800 can accommodate at least part of the central beam 140 so that the flame retardant medium 420 and the limiting body 410 avoid the central beam 140, which facilitates the assembly of the box cover 200 and the box 100.

[0162] In some examples, the central beam 140 extends along a second direction X, and the central beam 140 is parallel to the extension direction of the battery cell assembly; in other examples, the central beam 140 extends along a third direction Y, and the central beam 140 is perpendicular to the extension direction of the battery cell assembly.

[0163] In some examples, a connecting part 412 may be provided in the clearance space 800 between at least two covered areas; in other examples, at least two covered areas correspond to two limiting bodies 410 respectively, that is, limiting bodies 410 are provided on both sides of the central beam 140.

[0164] In some examples, the clearance space 800 is aligned with the central beam 140 and projected onto a projection plane perpendicular to the first direction Z. The orthographic projection of the central beam 140 overlaps with the orthographic projection of the clearance space 800, and a portion of the central beam 140 may be located within the clearance space 800.

[0165] Reference Figure 8 and Figure 9 In some embodiments of this application, the pressure relief mechanism 310 has a first dimension W1 along a preset direction, and the area of ​​the limiting body 410 where the flame-retardant medium 420 is provided has a second dimension W2 along the preset direction, the second dimension W2 being greater than or equal to the first dimension W1; wherein, the preset direction is perpendicular to the first direction Z.

[0166] In the technical solution of this application embodiment, the area of ​​the limiting body 410 with flame-retardant medium 420 has a second size W2, which is greater than or equal to the first size W1 of the pressure relief mechanism 310, so that the flame-retardant medium 420 released when the limiting body 410 is released can cover the entire pressure relief mechanism 310, optimize the coverage area of ​​the flame-retardant medium 420, and improve the flame-retardant fire extinguishing effect.

[0167] In some examples, the size of the pressure relief mechanism 310 along the second direction X is greater than its size along the third direction Y, with the second direction X being the preset direction; in other examples, the size of the pressure relief mechanism 310 along the second direction X is smaller than its size along the third direction Y, with the third direction Y being the preset direction.

[0168] In some examples, the length direction of the pressure relief mechanism 310 is consistent with the width direction of the battery cell 300, the pressure relief mechanism 310 has a first dimension W1 along the third direction Y, the width direction of the area where the flame retardant medium 420 is provided in the limiting body 410 is consistent with the width direction of the battery cell 300, and the area where the flame retardant medium 420 is provided in the limiting body 410 has a second dimension W2 along the third direction Y.

[0169] In some examples, the second dimension W2 is larger than the first dimension W1, and along the first direction Z, the second dimension W2 is 2 to 3 millimeters longer than the first dimension W1. On the one hand, the second dimension W2 is larger than the first dimension W1 so that the flame-retardant medium 420 can cover the pressure relief mechanism 310. On the other hand, the second dimension W2 does not cover the entire end cap 330, which can save material and reduce the load-bearing requirements of the flame-retardant medium 420 on the limiting body 410.

[0170] In some examples, the flame retardant medium 420 is an insulating medium to reduce the possibility of the flame retardant medium 420 causing a short circuit to the battery cell 300; with this configuration, the flame retardant medium 420 can also cover the entire end cap 330 of the battery cell 300, or even the entire battery cell 300, thereby improving the heat resistance and fire extinguishing effect.

[0171] Reference Figure 10 In some embodiments of this application, the limiting body 410 includes a first layer 413 and a second layer 414, the melting point of the first layer 413 is greater than the melting point of the second layer 414, and the second layer 414 is disposed between the first layer 413 and the first wall 210; the flame retardant medium 420 is embedded in the second layer 414, or the flame retardant medium 420 is disposed between the second layer 414 and the first wall 210.

[0172] In the technical solution of this application embodiment, the limiting body 410 is configured as a stacked structure of a first layer 413 and a second layer 414. The first layer 413 is disposed close to the pressure relief mechanism 310, and the flame retardant medium 420 is embedded in the second layer 414, or the flame retardant medium 420 is disposed between the second layer 414 and the first wall 210. Since the melting point of the first layer 413 is greater than the melting point of the second layer 414, the second layer 414 will melt and break before the first layer 413, so as to form a gradient breakage process, which is convenient to match the thermal runaway process of the battery cell 300.

[0173] In some examples, the first layer 413 faces the pressure relief mechanism 310 of the battery cell 300, and the second layer 414 faces the flame-retardant medium 420. The thickness of the first layer 413 can be greater than the thickness of the second layer 414, or the thickness of the first layer 413 can be less than the thickness of the second layer 414.

[0174] In some examples, the support portion 411 is provided with a first layer 413 and a second layer 414, and the connecting portion 412 is provided with a single-layer structure. In other examples, both the support portion 411 and the connecting portion 412 are provided with multi-layer structures.

[0175] In some examples, the first layer 413 and the second layer 414 are designed with a gradient melting point. The first layer 413 on the outside can be a high melting point film (such as PPS), and the second layer 414 on the inside can be a low melting point film (such as PET), thereby forming a gradient melting characteristic and delaying the material release time to match the thermal runaway process.

[0176] Reference Figure 11 , Figure 12 and Figure 13 In some embodiments of this application, the battery device further includes a protective plate 500, which is disposed between the cover 200 and the battery cell 300; the protective plate 500 has a first through hole 510 at the position corresponding to the pressure relief mechanism 310, and the flame retardant medium 420 covers the pressure relief mechanism 310 along the axial direction (e.g., the first direction Z) of the first through hole 510.

[0177] In the technical solution of this application embodiment, a protective plate 500 is provided between the cover 200 and the battery cell 300. The protective plate 500 can provide protection for the battery cell 300 and increase the structural strength of the battery device. A first through hole 510 is opened in the protective plate 500 at the position corresponding to the pressure relief mechanism 310. The flame retardant medium 420 covers the pressure relief mechanism 310 along the axial direction of the first through hole 510 so that when the limiting body 410 is released, the flame retardant medium 420 can pass through the first through hole 510 and be released to the pressure relief mechanism 310 position, thus taking into account both the structural strength of the battery device and the convenience of flame retardancy.

[0178] In some examples, the guard plate 500 is provided with a plurality of first through holes 510, and the plurality of first through holes 510 are provided one-to-one with a plurality of pressure relief mechanisms 310. Alternatively, at least some of the first through holes 510 may correspond to at least two pressure relief mechanisms 310. It should be noted that the number of first through holes 510 and the number of bearing parts 411 may be the same or different. For example, a single bearing part 411 may correspond to a plurality of first through holes 510.

[0179] In some examples, the width dimension (the dimension along the third direction Y) of the first through hole 510 is consistent with the second dimension W2 of the support portion 411; in other examples, the width dimension of the first through hole 510 is greater than the second dimension W2 of the support portion 411; and in still other examples, the width dimension of the first through hole 510 is smaller than the second dimension W2 of the support portion 411. It should be noted that the width dimension of the first through hole 510 should be greater than or equal to the first dimension W1 of the pressure relief mechanism 310.

[0180] In some examples, the protective plate 500 can be bonded to the cover 200 and / or the battery cell 300 to improve the overall strength of the battery assembly. It should be noted that the protective plate 500 may also be omitted between the cover 200 and the battery cell 300; for example, a pull strip can be installed on the battery cell assembly to improve its structural strength.

[0181] Reference Figure 9 and Figure 13 In some embodiments of this application, the battery device further includes a busbar 600 configured to electrically connect two different battery cells 300; a protective plate 500 covers the busbar 600 along a first direction Z.

[0182] In the technical solution of this application embodiment, the busbar 600 facilitates the series or parallel connection of multiple battery cells 300. Along the first direction Z, the protective plate 500 covers the busbar 600 so that the protective plate 500 provides protection and shielding for the busbar 600, which can reduce the possibility of the flame retardant medium 420 falling on the location of the busbar 600.

[0183] In some examples, the battery cell 300 includes electrode terminals located on both sides of the end cover 330 along the width direction of the battery cell 300 (e.g., the third direction Y). The busbar 600 is connected to the electrode terminals and is located between the battery cell 300 and the case cover 200. The projection of the protective plate 500 can cover the busbar 600 and the electrode terminals.

[0184] In some examples, the direction of the first wall 210 toward the guard plate 500 is parallel to the first direction Z. The projection of the guard plate 500 toward the first wall 210 along the first direction Z overlaps with the projection of the busbar 600, and the projection of the busbar 600 is covered by the projection of the guard plate 500.

[0185] Reference Figure 11 and Figure 12 In some embodiments of this application, there are at least two battery cells 300, and at least two battery cells 300 are arranged sequentially along the second direction X to form a battery cell assembly. The second direction X is perpendicular to the first direction Z. Along the second direction X, the protective plate 500 is provided with at least two first through holes 510, and at least one first through hole 510 corresponds to at least two pressure relief mechanisms 310.

[0186] In the technical solution of this application embodiment, along the arrangement direction of the battery cells 300 in the battery cell assembly, the protective plate 500 is sequentially provided with at least two first through holes 510 so that there is still a connection structure between two adjacent first through holes 510, thereby reducing the impact of the first through holes 510 on the structural strength of the protective plate 500. The first through hole 510 can correspond to at least two pressure relief mechanisms 310 in order to increase the coverage area of ​​a single first through hole 510, thereby taking into account both the structural strength of the protective plate 500 and the usability of the first through hole 510.

[0187] In some examples, at least two battery cells 300 are arranged sequentially along the second direction X to form a battery cell assembly. The battery cells 300 in the battery cell assembly are arranged in the second direction X. The guard plate 500 is provided with a plurality of first through holes 510 arranged sequentially along the second direction X so that the plurality of first through holes 510 can cover the pressure relief mechanism 310 of the entire battery cell assembly.

[0188] In some examples, the battery device includes multiple battery cell assemblies, and the multiple first through holes 510 corresponding to different battery cell assemblies can be arranged in parallel; or, the protective plate 500 includes partitions 520 provided corresponding to the first through holes 510, which increase the structural stability of the protective plate 500. The multiple first through holes 510 corresponding to different battery cell assemblies respectively form a hole system, and a partition 520 is provided between two adjacent first through holes 510 along the second direction X in the hole system. The multiple partitions 520 in two adjacent hole systems are arranged alternately along the second direction X.

[0189] In some technical solutions, a pressure relief mechanism 310 is provided at the top or bottom of the battery cell 300. When the battery cell 300 experiences thermal runaway, the exhaust speed of a single pressure relief mechanism 310 is relatively slow. The battery cell 300 is located in the receiving cavity 110 of the housing 100, and the gas generated by the thermal runaway of the battery cell 300 is discharged through the exhaust channel formed by the receiving cavity 110. Since thermoelectric separation is not achieved, the battery device exhausts slowly or requires higher costs to protect the battery device from thermal runaway. For example, several exhaust devices are added between the battery cells 300. This solution is not universal and will greatly increase costs and reduce the energy density of the battery device.

[0190] In some technical solutions, the battery pack is equipped with a pressure relief structure for pressure equalization. In the event of thermal runaway of a single battery cell, the gases emitted by the cell are typically guided to the outside of the battery pack through these relief structures. However, the gases released by the battery cells during thermal runaway contain various harmful substances, such as hydrogen fluoride (HF) and carbon monoxide (CO), which pose significant risks to human health and the ecological environment. Directly releasing these toxic gases into the external environment not only poses health threats such as poisoning and respiratory damage to on-site personnel but also potentially pollutes the atmosphere, water bodies, and soil, affecting the stability of the ecosystem. Furthermore, some toxic gases have strong diffusion and persistence, potentially remaining in the environment for extended periods and causing ongoing environmental risks.

[0191] Reference Figure 2 and Figure 11 In some embodiments of this application, the housing 100 includes a first beam 10A, the first beam 10A is provided with an airflow channel 150, the airflow channel 150 is connected to the receiving cavity 110, and a filter medium 430 is provided in the airflow channel 150.

[0192] The technical solution of this application embodiment provides an airflow channel 150 in the first beam 10A, which facilitates the rapid flow of airflow formed by the material discharged by the pressure relief mechanism 310 to the outside of the housing 100 and isolates the airflow from other battery cells 300; a filter medium 430 is provided in the airflow channel 150, which can effectively filter harmful substances in the airflow and improve the harmlessness standard of the battery device.

[0193] In some examples, the filter medium 430 includes a filter structure, such as a filter screen; in other examples, the filter medium 430 includes an adsorption structure, such as activated carbon; and in still other examples, the filter medium 430 includes an adsorption filter material that has both adsorption and filtration functions.

[0194] Reference Figure 9 , Figure 11 and Figure 14In some embodiments of this application, the first beam 10A includes a second wall 101 facing the first wall 210 and a third wall 102 facing the receiving cavity 110, wherein at least one of the second wall 101 and the third wall 102 is provided with a first channel hole 103, the first channel hole 103 communicating with the airflow channel 150 and the receiving cavity 110.

[0195] In the technical solution of this application embodiment, a first channel hole 103 is provided in the second wall 101 of the first beam 10A, so that the airflow formed by the material discharged by the pressure relief mechanism 310 in the receiving cavity 110 can enter the airflow channel 150 through the gap between the first wall 210 and the second wall 101; a first channel hole 103 is provided in the third wall 102 of the first beam 10A, so that the airflow formed by the material discharged by the pressure relief mechanism 310 in the receiving cavity 110 can directly enter the airflow channel 150 from the inside of the first wall 210.

[0196] In some examples, the second wall 101 is provided with a first channel hole 103; in other examples, the third wall 102 is provided with a first channel hole 103; and in still other examples, the second wall 101 and the third wall 102 are each provided with a first channel hole 103.

[0197] It should be noted that the second wall 101 and the third wall 102 may each be provided with one or more first channel holes 103, and the multiple first channel holes 103 may be arranged sequentially along the first direction Z and / or the second direction X.

[0198] Reference Figure 14 In some embodiments of this application, a partition 104 is provided in the airflow channel 150. The partition 104 is used to divide the airflow channel 150 into at least two sub-channels 151, and the at least two sub-channels 151 are connected.

[0199] The technical solution of this application embodiment, by setting a partition 104 in the airflow channel 150, can, on the one hand, provide support for the outer wall of the first beam 10A and improve the structural strength of the first beam 10A; on the other hand, the partition 104 divides the airflow channel 150 into multiple sub-channels 151 and connects them, which helps to extend the filtration path of the material discharged by the pressure relief mechanism 310 and improve the filtration effect.

[0200] In some examples, at least part of the partition 104 is provided with a second channel hole 105, and two adjacent sub-channels 151 are connected through the corresponding second channel hole 105.

[0201] In some examples, the separator 104 is set perpendicular to the first direction Z; in other examples, the separator 104 is set perpendicular to the second direction X or the third direction Y; or, the separator 104 perpendicular to the first direction Z is intersected with the separator 104 perpendicular to the second direction X.

[0202] In some examples, the first beam 10A includes a first side beam 120, the first side beam 120 is provided with an airflow channel 150, and a partition 104 can be provided inside the first side beam 120. The partition 104 divides the airflow channel 150 into multiple sub-channels 151, and the multiple sub-channels 151 all extend along the third direction Y. Adjacent sub-channels 151 can be connected or isolated.

[0203] In some examples, the side wall of the first side beam 120 facing the receiving cavity 110 may have a first channel hole 103 that connects to the airflow channel 150. For example, the first channel hole 103 is provided on the top wall and / or inner side wall of the first side beam 120, wherein the top wall is opposite to the first wall 210 and the inner side wall is the opposite side wall of the two first side beams 120.

[0204] Reference Figure 2 and Figure 11 In some embodiments of this application, the first beam 10A includes a first side beam 120, a second side beam 130, and a middle beam 140. The first side beam 120 and the second side beam 130 are connected and enclose a receiving cavity 110. The middle beam 140 is disposed in the receiving cavity 110 and is parallel to the first side beam 120. Both ends of the middle beam 140 are connected to the second side beam 130.

[0205] The technical solution of this application embodiment sets the first side beam 120, the second side beam 130 and the middle beam 140 as the first beam 10A, and sets the airflow channel 150 in the first side beam 120, the second side beam 130 and the middle beam 140, so that the gas discharged by the pressure relief mechanism 310 can be quickly guided to the outside of the box 100, and the airflow can be isolated from other battery cells 300.

[0206] In some examples, there are two first side beams 120. The first side beams 120 extend along a third direction Y. The first side beams 120 can be perpendicular to the expansion direction of the battery cell 300 to constrain the expansion deformation of the battery cell 300. The two first side beams 120 abut against the two ends of the battery cell assembly respectively. There are two second side beams 130. The second side beams 130 extend along a second direction X. The ends of the second side beams 130 along the second direction X are respectively connected to the two first side beams 120. The middle beam 140 can extend along the second direction X and connect to the first side beams 120. The middle beam 140 can also extend along a third direction Y and connect to the second side beams 130.

[0207] In some examples, the second side beam 130 is provided with an airflow channel 150, which can extend along the second direction X. Pressure relief structures 160 are provided at both ends of the second side beam 130, and the airflow channel 150 of the second side beam 130 is connected to the pressure relief structure 160. A first channel hole 103 can be opened on the inner side wall of the second side beam 130 facing the receiving cavity 110. The first channel hole 103 connects the receiving cavity 110 and the airflow channel 150. For example, the first channel hole 103 is provided in the middle of the second side beam 130 along the second direction X, so that the airflow flows toward both ends of the second side beam 130 respectively.

[0208] In some examples, the central beam 140 is provided with an airflow channel 150. For example, the central beam 140 extends along a third direction Y, and the airflow channel 150 of the central beam 140 extends along a third direction Y. The airflow channel 150 of the central beam 140 can be connected to the airflow channel 150 of the second side beam 130. A first channel hole 103 can be provided on the top wall or side wall of the central beam 140 facing the receiving cavity 110, and the airflow channel 150 of the central beam 140 is connected to the receiving cavity 110 through the first channel hole 103.

[0209] In some examples, components such as the second side beam 130, the first side beam 120, the middle beam 140, and the pressure relief structure 160 form an airflow channel 150, and a filter medium 430 is provided in the airflow channel 150. The lid 200 integrates a limiting body 410 and a flame-retardant medium 420, thus possessing flame-retardant and fire-extinguishing functions. Alternatively, a flame-retardant material can be filled and encapsulated into the lid 200, forming a first-stage adsorption and filtration structure. The first side beam 120 of the box body 100 includes a front beam and a rear beam. The front beam and rear beam have open structures and their internal cavities are filled with filter or adsorption materials, forming a second-stage adsorption and filtration structure. When a middle beam 140 is provided, the middle beam 140 can also form a second-stage adsorption and filtration structure. The second side beam 130 of the box body 100 has open structures at corresponding positions and its internal cavities leave space for filling with filter or adsorption materials, forming a third-stage adsorption and filtration structure. The pressure relief structure 160 of the box body 100 includes a pressure relief valve. By adjusting the valve's diaphragm aperture, the size of the passing particles can be controlled to form a fourth-stage adsorption and filtration structure.

[0210] The box body 100 and the box cover 200 form a four-way adsorption filtration structure. The four-way adsorption filtration structure can be connected in series and / or in parallel to form a rich adsorption filtration system that can effectively filter harmful substances in thermal runaway gases.

[0211] Reference Figure 1 In some embodiments of this application, the electrical device includes a battery device according to embodiments of this application, which is used to provide electrical energy.

[0212] The technical solution of this application embodiment includes an electrical device including a battery device of this application embodiment. The battery device integrates a limiting body 410 and a flame retardant medium 420 on the cover 200 so that the flame retardant medium 420 can be released in time under the thermal influence of the substances discharged by the pressure relief mechanism 310 to achieve flame retardancy and fire extinguishing, thereby weakening the impact of thermal runaway at the source and effectively reducing the adverse effects of thermal runaway battery cell 300 on surrounding battery cells 300.

[0213] In some examples, the electrical equipment is a vehicle, and the battery pack can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor, the controller controlling the battery pack to supply power to the power unit 900, for example, to meet the vehicle's power needs during starting, navigation, and driving.

[0214] In some examples, the battery unit can serve not only as the operating power source for the vehicle, but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle. For example, the battery unit supplies power to the power unit 900 to drive the vehicle.

[0215] In one possible embodiment of this application, reference is made to Figure 2 The lines with arrows indicate the flow path of gas in the battery device. The battery device cover 200 integrates a flame-retardant medium 420 with fire extinguishing or flame-retardant properties. The flame-retardant medium 420 is limited in the cover 200 by a limiter 410. In the event of thermal runaway of the battery cell 300, the flame-retardant medium 420 can be triggered as the first control measure. By releasing the flame-retardant medium 420 to the pressure relief mechanism 310, the temperature of the gas at the valve port is reduced and the severity of the thermal runaway reaction is mitigated.

[0216] The second side beam 130, the first side beam 120, the middle beam 140, and the pressure relief structure 160 of the housing 100 form an airflow channel 150, and a filter medium 430 is installed within the airflow channel 150. In the event of thermal runaway of the battery cell 300 causing the pressure relief mechanism 310 to eject gas, the gas that has not been absorbed by the flame-retardant medium 420 can be received by the front beam and / or rear beam, which have airflow channels 150 in the first side beam 120 and the middle beam 140 and are filled with adsorption filter medium 430, for sedimentation and adsorption of larger particles, forming a second adsorption filtration structure. The second side beams 130 on both sides of the housing 100 are provided with airflow channels 150, thus forming a directional exhaust channel structure. The airflow channels 150 of the second side beams 130 are filled with filter medium 430. The filter medium 430 can be designed according to the estimated exhaust volume generated after the thermal runaway of the battery cell 300, so that the volume of the airflow channels 150 and the volume of the filled filter medium 430 can be designed accordingly. This allows the gas to be quickly conducted while filtering particles of the corresponding size, thus forming a third adsorption filtration point. A large amount of thermal runaway gas will enter the airflow channels 150 of the second side beams 130 through the openings. The filter medium 430 inside the second side beams 130 will further process the particulate matter in the gas. After that, the gas will reach the four corners of the housing 100. Pressure relief structures 160 are provided at the four corners of the housing 100. The gas is filtered through the pressure relief structures 160 and discharged from the housing 100, thus forming a fourth adsorption filtration structure. Through the above-mentioned pathways for conduction and filtration, the gas emitted by the 300 battery cell will be quickly diverted, which can reduce the problem of high-temperature gas remaining in the battery device filled with electrical components for a long time, reduce the generation of secondary hazards, and reduce environmental pollution.

[0217] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery device, characterized in that, include: The housing has a receiving cavity, and the receiving cavity has a first opening; A battery cell is located in the receiving cavity, and the battery cell includes a pressure relief mechanism; A lid, connected to the housing and covering the first opening, the lid including a first wall facing the receiving cavity in a first direction, a limiting body, and a flame-retardant medium, the limiting body being located within the receiving cavity and connected to the first wall, the first wall covering the limiting body in the first direction, the flame-retardant medium being limited by the limiting body and separated from the battery cell, the limiting body being configured to release the limiting of at least a portion of the flame-retardant medium under the thermal influence of the substance discharged by the pressure relief mechanism, so as to release the flame-retardant medium.

2. The battery device according to claim 1, characterized in that, The limiting body is connected to the first wall and encloses it to form an accommodating space, and the flame-retardant medium is disposed in the accommodating space.

3. The battery device according to claim 2, characterized in that, The limiting body includes a supporting part and a connecting part. The connecting part connects the first wall and the supporting part, and the connecting part is arranged around the supporting part. The flame retardant medium is located on the side of the supporting part away from the battery cell along the first direction.

4. The battery device according to claim 2, characterized in that, The lid is provided with a receiving groove, the receiving groove including a second opening facing the limiting body, the limiting body covering at least a portion of the second opening to form the receiving space.

5. The battery device according to claim 1, characterized in that, The flame-retardant medium is attached to the limiting body.

6. The battery device according to claim 5, characterized in that, The limiting body has a plurality of receiving holes, and the flame-retardant medium is received in the receiving holes.

7. The battery device according to any one of claims 1 to 6, characterized in that, The battery cell is provided in at least two forms, and on the same projection plane perpendicular to the first direction, the orthographic projection of the flame-retardant medium overlaps with the orthographic projection of at least two of the pressure relief mechanisms.

8. The battery device according to any one of claims 1 to 6, characterized in that, The housing includes a central beam located within the receiving cavity; The flame-retardant medium forms at least two covered areas in the accommodating cavity, and an avoidance space is provided between the at least two covered areas, the avoidance space accommodating at least a portion of the central beam.

9. The battery device according to any one of claims 1 to 6, characterized in that, The pressure relief mechanism has a first dimension along a preset direction, and the area of ​​the limiting body where the flame-retardant medium is provided has a second dimension along the preset direction, wherein the second dimension is greater than or equal to the first dimension. The preset direction is perpendicular to the first direction.

10. The battery device according to claim 1, characterized in that, The limiting body includes a first layer and a second layer, wherein the melting point of the first layer is greater than the melting point of the second layer, and the second layer is disposed between the first layer and the first wall; The flame-retardant medium is embedded in the second layer, or the flame-retardant medium is disposed between the second layer and the first wall.

11. The battery device according to any one of claims 1 to 6, characterized in that, It also includes a protective plate, which is disposed between the box cover and the battery cell; The protective plate has a first through hole corresponding to the position of the pressure relief mechanism, and the flame-retardant medium covers the pressure relief mechanism along the axial direction of the first through hole.

12. The battery device according to claim 11, characterized in that, It also includes a busbar configured to electrically connect two different battery cells; Along the first direction, the guard plate covers the manifold.

13. The battery device according to claim 11, characterized in that, The battery cell is at least two, and the at least two battery cells are arranged sequentially along a second direction to form a battery cell assembly. The second direction is perpendicular to the first direction. Along the second direction, the protective plate is provided with at least two first through holes, and at least one first through hole corresponds to at least two pressure relief mechanisms.

14. The battery device according to any one of claims 1 to 6, characterized in that, The housing includes a first beam, which has an airflow channel connected to the receiving cavity, and a filter medium is provided in the airflow channel.

15. The battery device according to claim 14, characterized in that, The first beam includes a second wall facing the first wall and a third wall facing the receiving cavity, wherein at least one of the second wall and the third wall is provided with a first channel hole, the first channel hole communicating with the airflow channel and the receiving cavity.

16. The battery device according to claim 14, characterized in that, The airflow channel is provided with a separator, which is used to divide the airflow channel into at least two sub-channels, and the at least two sub-channels are connected.

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

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