Battery device, energy storage device, and electric device

Abstract

Embodiments of the present disclosure provide a battery device, an energy storage device, and an electric device. The battery device comprises a case assembly, a sealing member, and at least one battery cell. A first accommodating cavity is formed inside the case assembly; and a first cavity wall of the first accommodating cavity has at least one pressure relief area. The battery cell is arranged in the first accommodating cavity; the battery cell comprises a first pressure relief mechanism; and the pressure relief area is arranged corresponding to the first pressure relief mechanism. The sealing member surrounds the first pressure relief mechanism of the at least one battery cell, and the battery cell is in sealing fit with the first cavity wall by means of the sealing member.

Description

Battery devices, energy storage devices, and electrical appliances Technical Field

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

[0002] In electrical devices equipped with battery units, the battery unit can provide all or part of the power. During the use of the battery unit, the individual battery cells within the unit generate heat. Therefore, the battery cells are equipped with pressure relief mechanisms to release fumes and relieve pressure in the event of thermal runaway. In related technologies, the pressure relief mechanism may be damaged during the assembly of the battery unit, which may affect its normal operation. Summary of the Invention

[0003] In view of this, the present disclosure aims to provide a battery device, an energy storage device, and an electrical device that can reduce the possibility of damage to the first pressure relief mechanism to a certain extent.

[0004] Therefore, a first aspect of this disclosure provides a battery device, comprising:

[0005] A housing assembly, wherein the housing assembly has a first receiving cavity inside, and the first cavity wall of the first receiving cavity is provided with at least one pressure relief area;

[0006] At least one battery cell is disposed within the first receiving cavity, the battery cell includes a first pressure relief mechanism, and the pressure relief area is disposed corresponding to the first pressure relief mechanism;

[0007] A sealing element, the sealing element being disposed within the first pressure relief mechanism of at least one of the battery cells, the battery cell being sealed to the first cavity wall via the sealing element.

[0008] The battery device provided in this disclosure includes a housing assembly, a sealing element, and at least one battery cell. The housing assembly has a first receiving cavity, and the battery cell is disposed within the first receiving cavity. The housing assembly protects the battery cell. Each battery cell includes a first pressure relief mechanism. High-temperature fluid generated during thermal runaway of the battery cell can flow through the first pressure relief mechanism to a pressure relief area and be discharged through the pressure relief area. By providing a sealing element and surrounding the first pressure relief mechanism of at least one battery cell, the battery cell achieves a sealed fit between the sealing element and the first cavity wall. This improves the situation where adhesives or other materials come into contact with and damage the first pressure relief mechanism during assembly, thus protecting the first pressure relief mechanism. Furthermore, it reduces the impact of high-temperature fluid generated during thermal runaway of a battery cell on adjacent battery cells, thereby improving the reliability of the battery device.

[0009] In some embodiments, the seal corresponds one-to-one with the first pressure relief mechanism.

[0010] In this embodiment, by matching the seal with the first pressure relief mechanism one by one, it is further beneficial to protect the first pressure relief mechanism and further reduce the impact of the high-temperature fluid generated by the thermal runaway of the battery cell on the adjacent battery cells.

[0011] In some embodiments, the seal surrounds at least two of the first pressure relief mechanisms.

[0012] In this embodiment, by surrounding the seal with at least two first pressure relief mechanisms, it is beneficial to reduce the number of seals, thereby reducing costs and improving assembly efficiency.

[0013] In some embodiments, the seal is disposed between the battery cell and the first cavity wall.

[0014] In this embodiment, by placing the seal between the battery cell and the first cavity wall, the battery cell can be directly sealed to the first cavity wall through the seal, which helps to improve assembly efficiency and improves the reliability of the sealing structure between the battery cell and the first cavity wall.

[0015] In some embodiments, the pressure relief area is formed with a pressure relief port, which is disposed corresponding to the first pressure relief mechanism; the battery device further includes a diaphragm, which is disposed corresponding to the pressure relief port and covers at least a portion of the pressure relief port.

[0016] In this embodiment, by forming a pressure relief port in the pressure relief area, the high-temperature fluid flowing out from the first pressure relief mechanism during thermal runaway of the battery cell can be discharged through the pressure relief port. In addition, by setting a diaphragm and covering at least part of the pressure relief port, the pressure relief port is blocked, which can protect the first pressure relief mechanism before the battery cell thermal runaway.

[0017] In some embodiments, one of the diaphragms covers at least two of the pressure relief ports.

[0018] In this embodiment, by covering at least two pressure relief ports with a diaphragm, the number of diaphragms can be reduced, thereby reducing costs and improving assembly efficiency.

[0019] In some embodiments, there are multiple pressure relief regions, each pressure relief region includes multiple pressure relief ports, each pressure relief port of each pressure relief region is linearly arranged along a second direction, each pressure relief region is arranged along a first direction, the second direction and the first direction intersect; all the pressure relief ports of each pressure relief region correspond to one diaphragm.

[0020] In this embodiment, by assigning a diaphragm to each pressure relief port in each pressure relief area, it is beneficial to further reduce the number of diaphragms, thereby further reducing costs and improving assembly efficiency.

[0021] In some embodiments, at least a portion of the diaphragm corresponding to the pressure relief port is sunk away from the battery cell to form a platform, and at least a portion of the platform is located within the pressure relief port.

[0022] In this embodiment, by forming a recessed platform on the diaphragm and placing at least a portion of the recessed platform inside the pressure relief port, the recessed platform can be used to avoid and protect the first pressure relief mechanism, and can facilitate the installation of the first pressure relief mechanism.

[0023] In some embodiments, the side of the seal facing away from the battery cell is disposed on the side of the diaphragm facing the battery cell.

[0024] In this embodiment, by placing the side of the seal away from the battery cell on the side of the diaphragm facing the battery cell, the seal and the diaphragm can be pre-assembled into a whole, and then the whole connected to the seal can be assembled with the battery cell and the housing assembly, which helps to improve assembly efficiency.

[0025] In some embodiments, the melting point of the diaphragm is greater than or equal to 85°C and less than or equal to 200°C.

[0026] In this embodiment, by setting the melting point of the membrane to 85℃-200℃, the membrane can function normally before the thermal runaway of the battery cell, and the high-temperature fluid generated after the thermal runaway of the battery cell can smoothly melt the membrane and release pressure through the pressure relief port.

[0027] In some embodiments, the thickness of the diaphragm is greater than or equal to 0.3 mm and less than or equal to 1 mm.

[0028] In this embodiment, by setting the thickness of the diaphragm to 0.3mm-1mm, the diaphragm can function normally before the thermal runaway of the battery cell, and the high-temperature fluid generated after the thermal runaway of the battery cell can smoothly melt the diaphragm and release pressure through the pressure relief port.

[0029] In some embodiments, the membrane is made of at least one of polypropylene, polycarbonate, or polyethylene terephthalate.

[0030] In some embodiments, the battery device includes a heat insulation sheet disposed on the side of the housing assembly opposite to the first receiving cavity and covering the pressure relief area.

[0031] In this embodiment, by providing a heat insulation sheet on the side of the housing assembly away from the first receiving cavity to cover the pressure relief area, the rebounding particles and airflow will be blocked by the heat insulation sheet, that is, the heat insulation sheet can protect the first pressure relief mechanism of the adjacent battery cell.

[0032] In some embodiments, the heat insulation sheet corresponds one-to-one with the first pressure relief mechanism.

[0033] In this embodiment, by corresponding the heat insulation sheet with the first pressure relief mechanism one by one, the influence between adjacent heat insulation sheets can be reduced, which further helps to protect the first pressure relief mechanism.

[0034] In some embodiments, at least a portion of the heat insulation sheet corresponds to at least two of the first pressure relief mechanisms.

[0035] In this embodiment, by corresponding at least a portion of the heat insulation sheet with at least two first pressure relief mechanisms, it is beneficial to reduce the number of heat insulation sheets, thereby reducing costs and improving assembly efficiency.

[0036] In some embodiments, the heat insulation sheet includes sub-protective layers and weak points, adjacent sub-protective layers are connected through the weak points, each sub-protective layer corresponds to one of the first pressure relief mechanisms, and the pressure-bearing capacity of the weak points is less than the pressure-bearing capacity of other areas of the heat insulation sheet excluding the weak points.

[0037] In this embodiment, by setting the heat insulation sheet to include a sub-protective layer and a weak part, it is beneficial to improve assembly efficiency while protecting the first pressure relief mechanism.

[0038] In some embodiments, the thickness of at least a portion of the weak portion is less than the thickness of other areas of the insulation sheet excluding the weak portion.

[0039] In this way, the pressure-bearing capacity of the weak part is less than that of other areas of the insulation sheet. When the weak part is subjected to the same force as other areas, it is easier to break the insulation sheet from the weak part.

[0040] In some embodiments, the sub-protective layer is arranged along a second direction, the size of the weak portion in the first direction is smaller than the size of other areas of the insulation sheet other than the weak portion in the first direction, and the second direction intersects the first direction.

[0041] This allows the pressure-bearing capacity of the weak part to be less than that of other areas of the insulation sheet. When the weak part is subjected to the same force as other areas, it is beneficial to break the insulation sheet from the weak part.

[0042] In some embodiments, the weak portion is provided with at least one weakening hole.

[0043] Here, a weakening hole can be a through hole that penetrates the weak part along the thickness direction of the weak part, or it can be a blind hole that does not penetrate the weak part along the thickness direction of the weak part.

[0044] In some embodiments, the heat insulation sheet has a heat resistance temperature greater than or equal to 500°C.

[0045] In this embodiment, by setting the heat resistance temperature of the heat insulation sheet to be greater than or equal to 500°C, the heat insulation sheet can protect the first pressure relief mechanism when the battery cell experiences thermal runaway.

[0046] In some embodiments, the heat insulation sheet is made of at least one of titanium, titanium alloy, carbon fiber, and ceramic silicone rubber.

[0047] In some embodiments, the heat insulation sheet includes a titanium sheet with a thickness greater than or equal to 0.3 mm and less than or equal to 2 mm.

[0048] In this embodiment, by setting the thickness of the titanium sheet to 0.3mm-2mm, which is an appropriate range, the titanium sheet can protect the first pressure relief mechanism in the event of thermal runaway of a battery cell while minimizing the space and weight occupied.

[0049] In some embodiments, the battery device includes a heat insulation sheet disposed on the side of the housing assembly opposite to the first receiving cavity and covering the pressure relief area, and the recessed platform is connected to the heat insulation sheet.

[0050] In this embodiment, connecting the sinking platform to the heat insulation sheet helps to improve the integrity between the diaphragm and the heat insulation sheet, thereby improving the reliability of the battery device.

[0051] In some embodiments, the battery device includes a second pressure relief mechanism disposed in the housing assembly, the housing assembly further includes a second receiving cavity, the pressure relief mechanism communicates with the second receiving cavity, and the first receiving cavity communicates with the second receiving cavity via the pressure relief region.

[0052] Here, the housing assembly is divided into a first receiving cavity and a second receiving cavity by a separator. The first receiving cavity can be used to arrange battery cells and other high and low voltage components, while the second receiving cavity is used for the emission of thermal runaway flue gas. In this way, the flue gas in the second receiving cavity can be separated from the components in the first receiving cavity, thus achieving the separation of flue gas from high voltage.

[0053] In some embodiments, the second receiving cavity is provided with an exhaust channel, and the first receiving cavity is connected to the exhaust channel via the pressure relief area, wherein the exhaust channel includes at least a bent section.

[0054] By incorporating an exhaust channel into the housing assembly, connecting the second pressure relief mechanism to the exhaust channel, and connecting the first receiving cavity to the exhaust channel via a pressure relief area, the high-temperature fluid generated during thermal runaway of the battery device can flow into the exhaust channel through the pressure relief area and then be discharged through the exhaust channel. This helps reduce the possibility of the high-temperature fluid damaging other components within the battery device. Furthermore, by including at least one bend in the exhaust channel, its length is increased, which helps to cool the high-temperature fluid generated during thermal runaway of the battery device. This lowers the temperature of the fluid discharged through the exhaust channel, reducing the risk of combustion and open flames when the fluid comes into contact with oxygen.

[0055] In some embodiments, the battery device includes a phase change layer disposed within the second receiving cavity.

[0056] In this embodiment, by providing a phase change layer in the second receiving cavity, the high-temperature fluid generated by the thermal runaway of the battery device flows into the second receiving cavity and comes into contact with the phase change layer. The phase change layer absorbs heat and undergoes a phase change, thereby reducing the temperature of the fluid, which in turn helps to reduce the temperature of the fluid discharged by the battery device due to thermal runaway.

[0057] In some embodiments, the enclosure assembly includes an enclosure body and a protective plate. The enclosure body includes a first enclosure portion and a second enclosure portion, with a first receiving cavity formed between the first enclosure portion and the second enclosure portion. The protective plate is disposed on the side of the second enclosure portion away from the first receiving cavity and forms a second receiving cavity between it and the second enclosure portion. The second enclosure portion has the pressure relief area.

[0058] In this embodiment, the housing assembly is equipped with a protective plate. The first accommodating cavity can be used to arrange battery cells and other high and low voltage components, while the second accommodating cavity is used to arrange an exhaust channel for the discharge of thermal runaway flue gas. In this way, the flue gas in the exhaust channel can be separated from the components in the first accommodating cavity, thus achieving the separation of flue gas from high voltage.

[0059] A second aspect of this disclosure provides a battery device, comprising:

[0060] A housing assembly, wherein the housing assembly has a first receiving cavity inside, and the first cavity wall of the first receiving cavity is provided with at least one pressure relief port;

[0061] At least one battery cell is disposed in the first receiving cavity, the battery cell includes a first pressure relief mechanism, and the pressure relief port is disposed corresponding to the first pressure relief mechanism;

[0062] A sealing element is located between the battery cell and the first cavity wall, and surrounds the first pressure relief mechanism.

[0063] The battery device of this embodiment provides a sealing element, which is disposed between the battery cell and the first cavity wall and surrounds the first pressure relief mechanism. This allows the battery cell to be sealed to the first cavity wall through the sealing element. In this way, on the one hand, it can improve the situation where adhesives or other substances come into contact with and damage the first pressure relief mechanism during the assembly of the battery device, thus protecting the first pressure relief mechanism. On the other hand, it can also reduce the impact of high-temperature fluid generated by thermal runaway of the battery cell on adjacent battery cells, thereby improving the reliability of the battery device.

[0064] In some embodiments, the battery device further includes a diaphragm, the diaphragm including a cover portion that covers the pressure relief port, and the diaphragm further including a connecting portion located between the seal and the first cavity wall.

[0065] In other words, the connecting part of the diaphragm is connected to the seal and the first cavity wall, and the covering part of the diaphragm can block the pressure relief port, thus protecting the first pressure relief mechanism before the battery cell thermally runs away.

[0066] In some embodiments, one pressure relief port corresponds to multiple first pressure relief mechanisms, the seal is configured as a sealing frame surrounding the pressure relief port, and the diaphragm covers multiple pressure relief ports.

[0067] By covering at least multiple pressure relief ports with a single diaphragm, it is beneficial to reduce the number of diaphragms, thereby reducing costs and improving assembly efficiency.

[0068] In some embodiments, a heat insulation sheet is provided on the side of the diaphragm opposite to the battery cell.

[0069] In this embodiment, by providing a heat insulation sheet on the side of the diaphragm away from the battery cell, the rebounding particles and airflow will be blocked by the heat insulation sheet, that is, the heat insulation sheet can protect the first pressure relief mechanism and the diaphragm of the adjacent battery cell.

[0070] In some embodiments, one heat insulation sheet corresponds to multiple pressure relief ports, and the heat insulation sheet is provided with a weak portion located between the regions corresponding to two adjacent pressure relief ports.

[0071] In this embodiment, by setting the heat insulation sheet to include a weak part, it is beneficial to improve assembly efficiency while protecting the first pressure relief mechanism.

[0072] In some embodiments, the diaphragm is provided with a recessed platform, at least a portion of which is located within the pressure relief port, and at least a portion of the heat insulation sheet is connected to the recessed platform.

[0073] In this embodiment, connecting the sinking platform to the heat insulation sheet helps to improve the integrity between the diaphragm and the heat insulation sheet, thereby improving the reliability of the battery device.

[0074] In some embodiments, the battery device further includes a heat insulation sheet located on the side of the first cavity wall opposite to the first receiving cavity.

[0075] In this embodiment, by providing a heat insulation sheet on the side of the first cavity wall away from the first receiving cavity, the rebounding particles and airflow will be blocked by the heat insulation sheet, that is, the heat insulation sheet can protect the first pressure relief mechanism and diaphragm of the adjacent battery cell.

[0076] A second aspect of this disclosure provides an energy storage device, including the battery device described above.

[0077] A third aspect of this disclosure provides an electrical device, including the battery device or the energy storage device described above.

[0078] In some embodiments, the electrical device includes an aircraft. Attached Figure Description

[0079] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this disclosure;

[0080] Figure 2 is an exploded perspective view of a battery device provided in some embodiments of this disclosure;

[0081] Figure 3 is a schematic diagram of the structure of the protective plate provided in some embodiments of this disclosure, wherein the continuous dashed lines with arrows indicate the flow direction of the fluid;

[0082] Figure 4 is a cross-sectional view of a battery device provided in some embodiments of this disclosure;

[0083] Figure 5 is an enlarged view of point A in Figure 4;

[0084] Figure 6 is an enlarged view of point B in Figure 4;

[0085] Figure 7 is a schematic diagram of the connection structure between the seal and the diaphragm provided in some embodiments of this disclosure;

[0086] Figure 8 is a schematic diagram of the connection structure between the seal and the diaphragm provided in some embodiments of this disclosure;

[0087] Figure 9 is a cross-sectional view along the CC direction in Figure 8;

[0088] Figure 10 is an enlarged view of point D in Figure 9;

[0089] Figure 11 is a schematic diagram of the structure of the heat insulation sheet provided in some embodiments of this disclosure;

[0090] Figure 12 is an enlarged view of point E in Figure 11.

[0091] Explanation of reference numerals in the attached drawings: 10. Battery cell; 20. Housing assembly; 21. Housing body; 211. First housing section; 212. Second housing section; 22. Protective plate; 221. 23. Rib; 231. First receiving cavity; 232. Energy chamber; 233. Electrical chamber; 233. First cavity wall; 24. Second receiving cavity; 241. First sub-cavity; 242. Second sub-cavity; 25. Pressure relief area; 26. Exhaust passage; 261. Bend section; 262. First straight extension section; 263. Second straight extension section; 264. Third straight extension section; 265. Fourth straight extension section; 27. Expansion beam; 29. ​​Convergence area; 30. Second pressure relief mechanism; 40. Seal; 50. Diaphragm; 51. Platform; 52. Connecting part; 53. Covering part; 60. Heat insulation sheet; 61. Sub-protective layer; 62. Weak part; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0092] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0093] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0094] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0095] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0096] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0097] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0098] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0099] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0100] In some implementations, the electrode assembly is a stacked 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 can be cylindrical, flat, or polygonal, etc.

[0107] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0108] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0109] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This disclosure does not impose any particular limitations.

[0110] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0111] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0112] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0113] In related technologies, during the assembly of the battery device, the battery cells may be bonded to the wall of the first receiving cavity using adhesive. There is a possibility that the adhesive may come into contact with and damage the pressure relief mechanism, potentially affecting its normal operation. For example, if the battery cells are bonded to the housing assembly using structural adhesive, there is a possibility that the structural adhesive may overflow onto the pressure relief mechanism, clogging it.

[0114] Therefore, to reduce the possibility of damage to the first pressure relief mechanism during battery assembly, this disclosure provides a battery device including a housing assembly, a seal, and at least one battery cell. The housing assembly has a first receiving cavity inside, and the first cavity wall of the first receiving cavity is provided with at least one pressure relief area. The battery cell is disposed within the first receiving cavity and includes the first pressure relief mechanism, with the pressure relief area corresponding to the first pressure relief mechanism. The seal surrounds the first pressure relief mechanism of at least one battery cell, and the battery cell is sealed to the first cavity wall through the seal.

[0115] The battery device provided in this disclosure includes a housing assembly, a seal, and at least one battery cell. The housing assembly has a first receiving cavity, and the battery cell is disposed within the first receiving cavity. The housing assembly protects the battery cell. Each battery cell includes a first pressure relief mechanism. High-temperature fluid generated during thermal runaway of the battery cell can flow through the first pressure relief mechanism to a pressure relief area and be discharged through the pressure relief area. By providing a seal and surrounding the first pressure relief mechanism of at least one battery cell, the battery cell achieves a sealed fit between the seal and the cavity wall of the first receiving cavity. This improves the situation where adhesives or other materials may come into contact with and damage the first pressure relief mechanism during assembly, thus protecting the first pressure relief mechanism. Furthermore, it reduces the impact of high-temperature fluid generated during thermal runaway of a battery cell on adjacent battery cells, thereby improving the reliability of the battery device.

[0116] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical device includes the battery device according to any embodiment of this disclosure, and the battery device is used to provide electrical energy.

[0117] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This disclosure does not impose any special limitations on the above-mentioned electrical devices.

[0118] It should be noted that the technical solutions described in this disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices.

[0119] Referring to Figure 1, a controller 200, a motor 300, and a battery device 100 can be installed inside the vehicle 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0120] For example, the electrical device includes an aircraft.

[0121] Aircraft generally refer to machines that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0122] Referring to Figure 2, to meet different power demands, the battery device 100 includes at least one battery cell 10, where a battery cell 10 is the smallest unit constituting a module or battery pack of the battery device 100. Multiple battery cells 10 can be connected in series, parallel, or in a mixed configuration, where some battery cells 10 are connected in series and others in parallel. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing assembly 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed configuration to form a battery device 100 module, and then these modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing assembly 20. The battery device 100 may also include other structures; for example, it may include a busbar for electrical connection between the multiple battery cells 10. Each battery cell 10 can be a secondary battery device 100 or a primary battery device 100; it can also be a lithium-sulfur battery device 100, a sodium-ion battery device 100, or a magnesium-ion battery device 100, but is not limited to these. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0123] Referring to Figures 2 to 10, this disclosure provides a battery device 100, which includes a housing assembly 20, a sealing member 40, and at least one battery cell 10. The housing assembly 20 has a first receiving cavity 23 inside, and the first cavity wall 233 of the first receiving cavity 23 is provided with at least one pressure relief area 25. The battery cell 10 is disposed within the first receiving cavity 23, and the battery cell 10 includes a first pressure relief mechanism. The pressure relief area 25 is provided corresponding to the first pressure relief mechanism. The sealing member 40 surrounds the first pressure relief mechanism of at least one battery cell 10, and the battery cell 10 is sealed to the first cavity wall 233 through the sealing member 40.

[0124] Referring to Figure 2, the battery device 100 includes a housing assembly 20 and a battery cell 10, with the battery cell 10 disposed within the first receiving cavity 23 of the housing assembly 20.

[0125] The box assembly 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0126] The housing assembly 20 is used to encapsulate the battery cell 10, and the housing assembly 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 10.

[0127] For example, the housing assembly 20 is typically a cuboid structure. Both the length and width directions of the housing assembly 20 are parallel to the horizontal plane, and the length direction of the housing assembly 20 is parallel to the longest side of its cuboid structure. The height direction of the housing assembly 20 is perpendicular to the ground. For example, as shown in Figures 2 to 4, the width direction of the housing assembly 20 is a first direction, the length direction of the housing assembly 20 is a second direction, and the height direction of the housing assembly 20 is a third direction (i.e., the third direction is parallel to the height direction of the battery device 100).

[0128] In some embodiments, please refer to FIG2, the housing assembly 20 includes a housing body 21, the housing body 21 includes a first housing portion 211 and a second housing portion 212, the first housing portion 211 and the second housing portion 212 surround to form a first receiving cavity 23.

[0129] The battery cell 10 includes a first pressure relief mechanism for discharging internal gas from the battery cell 10.

[0130] As an example, the internal pressure or temperature of the battery cell 10 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 10 reaches the predetermined threshold, the first pressure relief mechanism is activated or a weak structure in the first pressure relief mechanism is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. The threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 10.

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

[0132] As an example, the battery device 100 also includes a second pressure relief mechanism 30, which is disposed on the housing assembly 20.

[0133] The second pressure relief mechanism 30 is used to release the internal gas of the housing assembly 20.

[0134] As an example, the housing assembly 20 is actuated to release internal pressure or temperature when the internal pressure or temperature reaches a predetermined threshold. When the internal pressure or temperature of the housing assembly 20 reaches the predetermined threshold, the second pressure relief mechanism 30 is activated or a weak structure provided in the second pressure relief mechanism 30 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on parameters such as the energy density of the battery device 100.

[0135] For example, the second pressure relief mechanism 30 may be an explosion-proof valve.

[0136] For example, the pressure-bearing capacity of the pressure relief region 25 is less than the pressure-bearing capacity of other regions of the first cavity wall 233 of the first receiving cavity 23 other than the pressure relief region 25. In the event of thermal runaway of the battery cell 10, the fluid in the first receiving cavity 23 can flow out from the pressure relief region 25.

[0137] For example, the first cavity wall 233 may be the bottom wall of the first receiving cavity 23.

[0138] The pressure relief area 25 is set in relation to the first pressure relief mechanism, which allows the high-temperature fluid flowing out of the first pressure relief mechanism from the thermal runaway of the battery cell 10 to be discharged through the pressure relief area 25.

[0139] For example, the projection of the first pressure relief mechanism is located within the projection range of the pressure relief region 25 on the first cavity wall 233.

[0140] For example, the first pressure relief mechanism is positioned directly opposite the pressure relief area 25.

[0141] The first cavity wall 233 of the first receiving cavity 23 is provided with at least one pressure relief area 25, which means that the first cavity wall 233 of the first receiving cavity 23 may be provided with one pressure relief area 25 or multiple pressure relief areas 25.

[0142] The first pressure relief mechanism in which the seal 40 is disposed of in at least one battery cell 10 means that the seal 40 can be a first pressure relief mechanism disposed in one battery cell 10 or a first pressure relief mechanism disposed in multiple battery cells 10.

[0143] Here, the battery cell 10 can be directly sealed to the first cavity wall 233 via the sealing element 40, or it can be indirectly sealed to the first cavity wall 233.

[0144] The specific type of seal 40 is not limited here.

[0145] For example, the seal 40 may be a sealing foam.

[0146] The battery device 100 provided in this embodiment includes a housing assembly 20, a sealing element 40, and at least one battery cell 10. The housing assembly 20 has a first receiving cavity 23, and the battery cell 10 is disposed within the first receiving cavity 23. The housing assembly 20 protects the battery cell 10. The battery cell 10 includes a first pressure relief mechanism. High-temperature fluid generated by thermal runaway of the battery cell 10 can flow through the first pressure relief mechanism to a pressure relief area 25 and be discharged through the pressure relief area 25. By providing the sealing element 40 and surrounding the first pressure relief mechanism of at least one battery cell 10, the battery cell 10 is sealed to the first cavity wall 233 through the sealing element 40. This improves the situation where adhesives or other substances come into contact with and damage the first pressure relief mechanism during the assembly process, thus protecting the first pressure relief mechanism. Furthermore, it reduces the impact of high-temperature fluid generated by thermal runaway of the battery cell 10 on adjacent battery cells 10, thereby improving the reliability of the battery device 100.

[0147] In some embodiments, the seal 40 corresponds one-to-one with the first pressure relief mechanism.

[0148] In other words, a seal 40 is disposed around a first pressure relief mechanism of a battery cell 10, meaning that each first pressure relief mechanism can be separated from other first pressure relief mechanisms.

[0149] In this embodiment, by corresponding the sealing element 40 with the first pressure relief mechanism one by one, it is further beneficial to protect the first pressure relief mechanism and further reduce the impact of the high temperature fluid generated by the thermal runaway of the battery cell 10 on the adjacent battery cell 10.

[0150] In some embodiments, as shown in Figures 7 and 8, the seal 40 is disposed around at least two first pressure relief mechanisms.

[0151] In other words, a seal 40 is disposed around the first pressure relief mechanism of at least two battery cells 10, that is, a seal 40 corresponds to at least two first pressure relief mechanisms.

[0152] In this embodiment, by surrounding the seal 40 with at least two first pressure relief mechanisms, it is beneficial to reduce the number of seals 40, thereby reducing costs and improving assembly efficiency.

[0153] In some embodiments, the seal 40 is disposed between the battery cell 10 and the first cavity wall 233.

[0154] In other words, the two ends of the sealing element 40 are directly connected to the battery cell 10 and the first cavity wall 233 respectively, that is, the battery cell 10 is directly sealed to the first cavity wall 233 through the sealing element 40.

[0155] In this embodiment, by placing the sealing element 40 between the battery cell 10 and the first cavity wall 233, the battery cell 10 is directly sealed to the first cavity wall 233 through the sealing element 40, which is beneficial to improve assembly efficiency and can improve the reliability of the sealing structure between the battery cell 10 and the first cavity wall 233.

[0156] In some embodiments, referring to Figures 2 and 6, the pressure relief region 25 is formed with a pressure relief port, which is disposed corresponding to the first pressure relief mechanism. The battery device 100 also includes a diaphragm 50, which is disposed corresponding to the pressure relief port and covers at least a portion of the pressure relief port.

[0157] Here, the pressure relief port is set in accordance with the first pressure relief mechanism, so that the high-temperature fluid flowing out of the first pressure relief mechanism from the thermal runaway of the battery cell 10 can be discharged through the pressure relief port.

[0158] For example, the projection of the first pressure relief mechanism is located within the projection range of the pressure relief port on the first cavity wall 233.

[0159] For example, the first pressure relief mechanism is positioned directly opposite the pressure relief port.

[0160] The diaphragm 50 is correspondingly arranged with the pressure relief port and covers at least part of the pressure relief port. In other words, the diaphragm 50 can cover at least part of the pressure relief port and play the role of shielding the pressure relief port. Before the battery cell 10 thermally runs away, it can protect the first pressure relief mechanism.

[0161] Here, the diaphragm 50 can be a partial pressure relief port covered by the 53 section, or it can cover all pressure relief ports.

[0162] In this embodiment, by forming a pressure relief port in the pressure relief area 25, the high-temperature fluid flowing out of the first pressure relief mechanism from the thermal runaway of the battery cell 10 can be discharged through the pressure relief port. In addition, by setting a diaphragm 50 and covering at least part of the pressure relief port, the pressure relief port is blocked, which can protect the first pressure relief mechanism before the thermal runaway of the battery cell 10.

[0163] In some embodiments, as shown in Figures 4 to 8, a diaphragm 50 covers at least two pressure relief ports.

[0164] Here, one pressure relief port can correspond to one first pressure relief mechanism, or one pressure relief port can correspond to multiple first pressure relief mechanisms.

[0165] In other words, one diaphragm 50 corresponds to at least two pressure relief ports.

[0166] In this embodiment, by covering at least two pressure relief ports with one diaphragm 50, the number of diaphragms 50 can be reduced, thereby reducing costs and improving assembly efficiency.

[0167] Of course, in other embodiments, a diaphragm 50 may cover a pressure relief port.

[0168] In some embodiments, please refer to Figures 2 and 7. There are multiple pressure relief regions 25, each pressure relief region 25 includes multiple pressure relief ports, each pressure relief port of each pressure relief region 25 is linearly arranged along a second direction, each pressure relief region 25 is arranged along a first direction, and the second direction and the first direction intersect; all pressure relief ports of each pressure relief region 25 correspond to a diaphragm 50.

[0169] For example, the battery pack includes a plurality of battery cells 10, which are arranged linearly along a second direction. Each battery pack corresponds to a pressure relief region 25, and all pressure relief ports of each pressure relief region 25 correspond to a diaphragm 50. That is, each battery pack corresponds to a diaphragm 50.

[0170] Of course, multiple battery packs can also correspond to one diaphragm 50.

[0171] The second direction intersects the first direction, meaning that the second direction and the first direction are not parallel.

[0172] For example, the second direction is perpendicular to the first direction.

[0173] In this embodiment, by assigning each pressure relief port of each pressure relief region 25 to a diaphragm 50, it is beneficial to further reduce the number of diaphragms 50, thereby further reducing costs and improving assembly efficiency.

[0174] In some embodiments, referring to Figures 6 to 8, at least a portion of the diaphragm 50 corresponding to the pressure relief port area sinks away from the battery cell 10 to form a recessed platform 51, at least a portion of the recessed platform 51 being located within the pressure relief port.

[0175] "At least part of the sinkhole 51 is located inside the pressure relief port" means that either part of the sinkhole 51 is located inside the pressure relief port, or all of the sinkhole 51 is located inside the pressure relief port.

[0176] In this embodiment, by forming a recessed platform 51 on the diaphragm 50 and placing at least a portion of the recessed platform 51 inside the pressure relief port, the recessed platform 51 can be used to avoid and protect the first pressure relief mechanism, and can facilitate the installation of the first pressure relief mechanism.

[0177] In some embodiments, the side of the seal 40 facing away from the battery cell 10 is disposed on the side of the diaphragm 50 facing the battery cell 10.

[0178] In other words, the side of the seal 40 facing the battery cell 10 is connected to the battery cell 10, and the side of the seal 40 away from the battery cell 10 is connected to the side of the diaphragm 50 facing the battery cell 10.

[0179] For example, the seal 40 and the battery cell 10 may be bonded together.

[0180] For example, the seal 40 and the diaphragm 50 may be bonded together.

[0181] In this embodiment, by placing the side of the seal 40 away from the battery cell 10 on the side of the diaphragm 50 facing the battery cell 10, the seal 40 and the diaphragm 50 can be pre-assembled into a whole, and then the whole formed by the two can be assembled with the battery cell 10 and the housing assembly 20, which helps to improve assembly efficiency.

[0182] In some embodiments, the melting point of the diaphragm 50 is greater than or equal to 85°C and less than or equal to 200°C.

[0183] The melting point of the diaphragm 50 can be any one of the following values, or a value between any two: 85℃, 90℃, 95℃, 100℃, 105℃, 110℃, 115℃, 120℃, 125℃, 130℃, 135℃, 140℃, 145℃, 150℃, 155℃, 160℃, 165℃, 170℃, 175℃, 180℃, 185℃, 190℃, 195℃, and 200℃.

[0184] In this embodiment, by setting the melting point of the diaphragm 50 to 85°C-200°C, the diaphragm 50 can function normally before the thermal runaway of the battery cell 10, and the high-temperature fluid generated after the thermal runaway of the battery cell 10 can smoothly melt the diaphragm 50 and release pressure through the pressure relief port.

[0185] In some embodiments, the thickness of the diaphragm 50 is greater than or equal to 0.3 mm and less than or equal to 1 mm.

[0186] The thickness of the diaphragm 50 can be any one of 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, or any value between two of them.

[0187] In this embodiment, by setting the thickness of the diaphragm 50 to 0.3mm-1mm, the diaphragm 50 can function normally before the thermal runaway of the battery cell 10, and the high-temperature fluid generated after the thermal runaway of the battery cell 10 can smoothly melt the diaphragm 50 and release pressure through the pressure relief port.

[0188] Here, the material of diaphragm 50 is not restricted.

[0189] In some embodiments, the diaphragm 50 is made of at least one of polypropylene (PP), polycarbonate (PC), or polyethylene glycol terephthalate (PET).

[0190] In related technologies, when a battery cell 10 experiences thermal runaway, in addition to ejecting high-temperature gas, it is also accompanied by the ejection of high-temperature metal particles. After the high-speed particles and airflow are discharged through the pressure relief area 25, they will bounce back after hitting an obstacle, which may cause the first pressure relief mechanism of the adjacent battery cell 10 to break and leak, which may further lead to thermal runaway.

[0191] In some embodiments, as shown in Figures 2 to 12, the battery device 100 includes a heat insulation sheet 60 disposed on the side of the housing assembly 20 away from the first receiving cavity 23 and covering the pressure relief area 25.

[0192] By covering the pressure relief area 25 with the heat insulation sheet 60, the rebounding particles and airflow will be blocked by the heat insulation sheet 60, that is, the heat insulation sheet 60 can protect the first pressure relief mechanism of the adjacent battery cell 10.

[0193] The heat insulation sheet 60 is disposed on the side of the housing assembly 20 away from the first receiving cavity 23. In this way, the high-temperature fluid generated after the thermal runaway of the battery cell 10 can break through the heat insulation sheet 60 and be discharged through the pressure relief area 25. The rebounding particles and airflow will exert a force on the heat insulation sheet 60 to press the heat insulation sheet 60 against the housing assembly 20.

[0194] In this embodiment, by providing a heat insulation sheet 60 on the side of the housing assembly 20 away from the first receiving cavity 23 to cover the pressure relief area 25, the rebounding particles and airflow will be blocked by the heat insulation sheet 60, that is, the heat insulation sheet 60 can protect the first pressure relief mechanism of the adjacent battery cell 10.

[0195] In some embodiments, please refer to Figure 6, the heat insulation sheet 60 corresponds one-to-one with the first pressure relief mechanism.

[0196] In other words, a heat insulation sheet 60 protects the first pressure relief mechanism of a single battery cell 10.

[0197] In this embodiment, by corresponding the heat insulation sheet 60 with the first pressure relief mechanism one by one, the influence between adjacent heat insulation sheets 60 can be reduced, which further helps to protect the first pressure relief mechanism.

[0198] In some embodiments, at least a portion of the heat insulation sheet 60 corresponds to at least two first pressure relief mechanisms.

[0199] In other words, a heat shield 60 protects the first pressure relief mechanism of at least two battery cells 10.

[0200] The phrase "at least some of the heat insulation sheet 60 corresponds to at least two first pressure relief mechanisms" means that either some of the heat insulation sheet 60 corresponds to at least two first pressure relief mechanisms, or all of the heat insulation sheet 60 corresponds to at least two first pressure relief mechanisms.

[0201] In this embodiment, by corresponding at least a portion of the heat insulation sheet 60 with at least two first pressure relief mechanisms, it is beneficial to reduce the number of heat insulation sheets 60, thereby reducing costs and improving assembly efficiency.

[0202] In some embodiments, please refer to Figures 11 and 12. The heat insulation sheet 60 includes a sub-protective layer 61 and a weak portion 62. Adjacent sub-protective layers 61 are connected through the weak portion 62. Each sub-protective layer 61 corresponds to a first pressure relief mechanism. The pressure bearing capacity of the weak portion 62 is less than the pressure bearing capacity of other areas of the heat insulation sheet 60 other than the weak portion 62.

[0203] Here, by making the pressure-bearing capacity of the weak part 62 less than that of other areas of the heat insulation sheet 60, when the high-temperature fluid generated by the thermal runaway of the battery cell 10 acts on the heat insulation sheet 60, the weak part 62 between the sub-protective layer 61 of the thermally runaway battery cell 10 and the adjacent sub-protective layer 61 will break, thereby relieving pressure.

[0204] In this embodiment, by setting the heat insulation sheet 60 to include a sub-protective layer 61 and a weak part 62, it is beneficial to improve assembly efficiency while protecting the first pressure relief mechanism.

[0205] It should be noted that the specific structure of the weak part 62 can vary.

[0206] For example, at least a portion of the cross-sectional area of ​​the weak portion 62 is smaller than the cross-sectional area of ​​the other regions of the insulation sheet 60 excluding the weak portion 62.

[0207] In some embodiments, the thickness of at least a portion of the weak portion 62 is less than the thickness of other regions of the insulation sheet 60 besides the weak portion 62.

[0208] In other words, the thickness of the weak part 62 can be reduced, so that the pressure-bearing capacity of the weak part 62 is less than that of other areas of the heat insulation sheet 60 except for the weak part 62. When the weak part 62 is subjected to the same force as other areas, it is beneficial to break the heat insulation sheet 60 from the weak part 62.

[0209] In some embodiments, the sub-protective layer 61 is arranged along a second direction, the size of the weak portion 62 in the first direction is smaller than the size of other areas of the heat insulation sheet 60 other than the weak portion 62 in the first direction, and the second direction intersects with the first direction.

[0210] In other words, the size of the weak part 62 in the first direction can be reduced, so that the pressure-bearing capacity of the weak part 62 is less than that of other areas of the heat insulation sheet 60 except for the weak part 62. When the weak part 62 is subjected to the same force as other areas, it is beneficial to break the heat insulation sheet 60 from the weak part 62.

[0211] In some embodiments, as shown in Figures 11 and 12, the weak portion 62 is provided with at least one weakening hole.

[0212] Here, the number of weakening holes can be one or more.

[0213] In embodiments where there are multiple weakening holes, each weakening hole is arranged along a first direction.

[0214] Here, the weakening hole can be a through hole that penetrates the weak portion 62 along the thickness direction of the weak portion 62, or it can be a blind hole that does not penetrate the weak portion 62 along the thickness direction of the weak portion 62.

[0215] In some embodiments, the heat resistance temperature of the heat insulation sheet 60 is greater than or equal to 500°C.

[0216] Here, heat resistance temperature refers to the temperature at which a material can maintain its mechanical strength without significant reduction in a high-temperature environment.

[0217] In this embodiment, by setting the heat resistance temperature of the heat insulation sheet 60 to be greater than or equal to 500°C, the heat insulation sheet 60 can protect the first pressure relief mechanism when the battery cell 10 experiences thermal runaway.

[0218] It should be noted that the specific material of the heat insulation sheet 60 is not limited here.

[0219] In some embodiments, the material of the heat insulation sheet 60 includes at least one of titanium, titanium alloy, carbon fiber, and ceramic silicone rubber.

[0220] For example, the heat insulation sheet 60 can also be a mica sheet.

[0221] In some embodiments, the heat insulation sheet 60 includes a titanium sheet with a thickness greater than or equal to 0.3 mm and less than or equal to 2 mm.

[0222] The thickness of the titanium sheet can be any one of the following values ​​or any combination of two: 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 1.9mm, and 2mm.

[0223] In this embodiment, by setting the thickness of the titanium sheet to 0.3mm-2mm, which is an appropriate range, the titanium sheet can protect the first pressure relief mechanism in the event of thermal runaway of the battery cell 10 while minimizing the space and weight occupied.

[0224] In some embodiments, please refer to FIG6, the battery device 100 includes a heat insulation sheet 60, which is disposed on the side of the housing assembly 20 away from the first receiving cavity 23 and covers the pressure relief area 25. The recessed platform 51 is connected to the heat insulation sheet 60.

[0225] For example, the recessed platform 51 is bonded to the heat insulation sheet 60.

[0226] In this embodiment, connecting the settling platform 51 with the heat insulation sheet 60 helps to improve the integrity between the diaphragm 50 and the heat insulation sheet 60, thereby improving the reliability of the battery device 100.

[0227] In some embodiments, please refer to Figures 2 to 6, the housing assembly 20 further includes a second receiving cavity 24, a second pressure relief mechanism is connected to the second receiving cavity 24, and a first receiving cavity 23 is connected to the second receiving cavity 24 via a pressure relief region 25.

[0228] By way of example, the housing assembly 20 also includes a partition that divides the housing assembly 20 into a first receiving cavity 23 and a second receiving cavity 24.

[0229] Here, the housing assembly 20 is divided into a first receiving cavity 23 and a second receiving cavity 24 by a separator. The first receiving cavity 23 can be used to arrange the battery cell 10 and other high and low voltage components, while the second receiving cavity 24 is used for the emission of thermal runaway flue gas. In this way, the flue gas in the second receiving cavity 24 can be separated from the components in the first receiving cavity 23, thus achieving the separation of flue gas from high voltage.

[0230] In some embodiments, please refer to Figures 2 to 6. An exhaust passage 26 is provided in the second receiving cavity 24. The first receiving cavity 23 is connected to the exhaust passage 26 via the pressure relief region 25. The exhaust passage 26 includes at least a bent section 261.

[0231] As an example, the exhaust channel 26 connects to the outside of the battery device 100. High-temperature fluid generated during thermal runaway of the battery device 100 can flow into the exhaust channel 26 via the pressure relief area 25, and then be discharged to the outside of the battery device 100 through the exhaust channel 26. This separates the high-temperature fluid from the components inside the first receiving cavity 23, reducing the risk of damage to other normally functioning battery cells 10 caused by the high-temperature fluid. Furthermore, the exhaust channel 26 can also separate the high-temperature fluid from high-voltage components, which helps to reduce damage to the high-voltage components of the battery device 100, thereby mitigating insulation failure and even short-circuit arcing.

[0232] The exhaust passage 26 includes at least one bend 261, that is, the exhaust passage 26 extends in a bend.

[0233] For example, the exhaust passage 26 is a labyrinth exhaust passage 26.

[0234] Understandably, given a fixed amount of space, a curved exhaust passage 26 is longer than a straight exhaust passage 26.

[0235] By incorporating a bend 261, the length of the exhaust channel 26 can be increased within a given space, thus lengthening the fluid flow path. As the fluid flows through the exhaust channel 26, it will be cooled down. Therefore, the longer the exhaust channel 26 is, the lower the temperature of the fluid discharged through it.

[0236] Here, the number of bends 261 is not limited; there can be one or more bends 261.

[0237] By forming an exhaust channel 26 in the housing assembly 20, and connecting the second pressure relief mechanism 30 to the exhaust channel 26, and connecting the first receiving cavity 23 to the exhaust channel 26 via the pressure relief region 25, the high-temperature fluid generated by thermal runaway of the battery device 100 can flow into the exhaust channel 26 via the pressure relief region 25 and then be discharged through the exhaust channel 26. This helps to reduce the possibility of the high-temperature fluid damaging other components inside the battery device 100. Furthermore, by configuring the exhaust channel 26 to include at least a bent section 261, the length of the exhaust channel 26 is increased, thereby cooling the high-temperature fluid generated by thermal runaway of the battery device 100. This reduces the temperature of the fluid discharged through the exhaust channel 26, decreasing the risk of combustion and open flame caused by the fluid coming into contact with oxygen.

[0238] In some embodiments, referring to FIG3, the exhaust passage 26 includes a first straight extension 262, a second straight extension 263, and a bent section 261. The first straight extension 262 and the second straight extension 263 both extend along a first direction, and the bent section 261 connects the first straight extension 262 and the second straight extension 263.

[0239] Here, the number of the first straight line extension segment 262 and the second straight line extension segment 263 is not limited and can be set according to space and requirements.

[0240] The number of the first straight line extension segment 262 can be one or more.

[0241] The number of the second straight line extension segment 263 can be one or more.

[0242] Here, the first straight extension segment 262 and the second straight extension segment 263 both extend along the second direction, and the bending segment 261 connects the first straight extension segment 262 and the second straight extension segment 263. That is to say, the exhaust passage 26 defined between the first straight extension segment 262, the second straight extension segment 263 and the bending segment 261 is roughly "U" shaped.

[0243] In this embodiment, by extending both the first straight extension segment 262 and the second straight extension segment 263 along the second direction, and connecting the first straight extension segment 262 and the second straight extension segment 263 with the bent segment 261, the exhaust channel 26 is extended in a bent manner, thereby increasing the length of the exhaust channel 26.

[0244] In some embodiments, referring to FIG3, the projections of the first straight line extension 262 and the second straight line extension 263 in the second direction at least partially overlap.

[0245] Here, the projections of the first straight line extension segment 262 and the second straight line extension segment 263 in the second direction may overlap, or the projections of the first straight line extension segment 262 and the second straight line extension segment 263 in the second direction may completely overlap.

[0246] For example, the first straight line extension 262 and the second straight line extension 263 have the same dimensions in the first direction.

[0247] Of course, in other embodiments, the dimensions of the first straight extension segment 262 and the second straight extension segment 263 in the first direction may also be different.

[0248] For example, the first straight line extension segment 262 and the second straight line extension segment 263 are arranged sequentially along the second direction.

[0249] It is understandable that, given that the dimensions of the first straight extension segment 262 and the second straight extension segment 263 are fixed in the first direction, the greater the overlap of the projections of the first straight extension segment 262 and the second straight extension segment 263 in the second direction, the more space is saved.

[0250] In this embodiment, by setting the projections of the first straight extension segment 262 and the second straight extension segment 263 in the second direction to at least partially overlap, it is beneficial to increase the length of the exhaust channel 26 while improving the compactness of the exhaust channel 26 distribution.

[0251] In some embodiments, please continue to refer to FIG3, the first straight extension 262 is connected to the second pressure relief mechanism 30, and the second straight extension 263 is connected to the pressure relief area 25.

[0252] Thus, the high-temperature fluid generated by thermal runaway of the battery device 100 can flow into the second straight extension section 263 through the pressure relief area 25, and then flow through the bending section 261 and the first straight extension section 262 to the second pressure relief mechanism 30, and be discharged through the second pressure relief mechanism 30.

[0253] Here, the first straight extension section 262 and the second pressure relief mechanism 30 can be directly connected, or they can be connected after passing through other flow channels.

[0254] Here, the second straight extension 263 and the pressure relief area 25 can be directly connected, or they can be connected through other flow channels.

[0255] In some embodiments, please continue to refer to FIG3, the exhaust passage 26 includes a third straight extension 264, a fourth straight extension 265 and a bent section 261. The third straight extension 264 extends along a first direction, the fourth straight extension 265 extends along a second direction, and the bent section 261 connects the third straight extension 264 and the fourth straight extension 265.

[0256] Here, the number of the third straight line extension segment 264 and the fourth straight line extension segment 265 is not limited and can be set according to space and requirements.

[0257] The number of the third straight line extension segment 264 can be one or more.

[0258] The number of the fourth straight line extension segment 265 can be one or more.

[0259] For example, the number of third straight extension segments 264 is one, the number of fourth straight extension segments 265 is two, and the number of bending segments 261 is also two.

[0260] Here, the third straight extension segment 264 extends along the first direction, the fourth straight extension segment 265 extends along the second direction, and the bending segment 261 connects the third straight extension segment 264 and the fourth straight extension segment 265. That is to say, the exhaust passage 26 defined between the third straight extension segment 264, the fourth straight extension segment 265 and the bending segment 261 is roughly "L" shaped.

[0261] In this embodiment, by extending the third straight extension segment 264 along the first direction, extending the fourth straight extension segment 265 along the second direction, and connecting the third straight extension segment 264 and the fourth straight extension segment 265 with the bending segment 261, the exhaust channel 26 is extended in a bent manner, thereby increasing the length of the exhaust channel 26.

[0262] In some embodiments, please continue to refer to FIG3, the third straight extension 264 is connected to the second pressure relief mechanism 30, and the fourth straight extension 265 is connected to the pressure relief area 25.

[0263] Thus, the high-temperature fluid generated by thermal runaway in the battery device 100 can flow into the fourth straight extension section 265 through the pressure relief area 25, and then flow through the bending section 261 and the third straight extension section 264 to the second pressure relief mechanism 30, and be discharged through the second pressure relief mechanism 30.

[0264] Here, the third straight extension section 264 and the second pressure relief mechanism 30 can be directly connected, or they can be connected after passing through other flow channels.

[0265] Here, the fourth straight extension 265 and the pressure relief area 25 can be directly connected, or they can be connected through other flow channels.

[0266] In some embodiments, the battery device 100 includes a phase change layer disposed within the second receiving cavity 24.

[0267] Phase change layers can undergo phase change by absorbing heat.

[0268] In this embodiment, by providing a phase change layer in the second receiving cavity 24, the high-temperature fluid generated by the thermal runaway of the battery device 100 flows into the second receiving cavity 24 and comes into contact with the phase change layer. The phase change layer absorbs heat and undergoes a phase change, thereby reducing the temperature of the fluid, which in turn helps to reduce the temperature of the fluid discharged by the battery device 100 due to thermal runaway.

[0269] In some embodiments, please refer to Figures 2 to 6. The enclosure assembly 20 includes an enclosure body 21 and a protective plate 22. The enclosure body 21 includes a first enclosure portion 211 and a second enclosure portion 212. A first receiving cavity 23 is formed between the first enclosure portion 211 and the second enclosure portion 212. The protective plate 22 is disposed on the side of the second enclosure portion 212 away from the first receiving cavity 23 and forms a second receiving cavity 24 between the protective plate 22 and the second enclosure portion 212. The second enclosure portion 212 has a pressure relief area 25.

[0270] For example, the housing assembly 20 also includes a first wall for supporting the battery cell 10, and a pressure relief area 25 is disposed on the first wall, which is located between the protective plate 22 and the first wall.

[0271] For example, the first wall may be the bottom wall of the housing assembly 20, that is, the first wall is the first cavity wall 233.

[0272] For example, the protective plate 22 may be a bottom protective plate.

[0273] Here, the exhaust channel 26 is located between the protective plate 22 and the first wall, that is, the exhaust channel 26 is located on the outside of the box.

[0274] In this embodiment, the housing assembly 20 is provided with a protective plate 22, and the exhaust channel 26 is located between the protective plate 22 and the first wall. The first receiving cavity 23 can be used to arrange the battery cell 10 and other high and low voltage components. The space between the protective plate 22 and the first wall is used to arrange the exhaust channel 26 for the discharge of thermal runaway flue gas. In this way, the flue gas in the exhaust channel 26 can be separated from the components in the first receiving cavity 23, and the flue gas can be separated from the high voltage.

[0275] It should be noted that the specific way the exhaust channel 26 is formed is not limited here.

[0276] In some embodiments, please refer to Figures 2 and 3, at least one partition 221 is formed between the protective plate 22 and the first wall, and the partition 221 divides the space between the protective plate 22 and the first wall to form an exhaust channel 26.

[0277] The specific number of diaphragm bars 221 is not limited here; there may be one or more diaphragm bars 221.

[0278] For example, at least one rib 221 is formed on the side of the protective plate 22 facing the first wall, or at least one rib 221 is formed on the side of the first wall facing the protective plate 22.

[0279] In this embodiment, an exhaust channel 26 is formed by forming a rib 221 between the protective plate 22 and the first wall, which is a simple structure.

[0280] Of course, in other embodiments, the protective plate 22 and / or the first wall may form a groove, and an exhaust channel 26 may be formed between the groove wall and the protective plate 22 and / or the first wall.

[0281] In some embodiments, as shown in Figures 2 and 3, a portion of the protective plate 22 protrudes to form a rib 221.

[0282] In other words, the rib 221 is integrally formed from the protective plate 22, which helps to reduce the number of parts and improve assembly efficiency.

[0283] In some embodiments, a portion of the first wall protrudes to form a rib 221.

[0284] In other words, the rib 221 is integrally formed from the first wall, which helps to reduce the number of parts and improve assembly efficiency.

[0285] Of course, in other embodiments, the rib 221 may also be installed on the protective plate 22.

[0286] Of course, in other embodiments, the rib 221 may also be installed on the first wall.

[0287] In some embodiments, as shown in Figures 4 and 5, the rib 221 is in a sealing fit with the first wall and / or the protective plate 22.

[0288] For example, the rib 221 may be bonded to the first wall to improve the sealing and reliability of the exhaust passage 26.

[0289] For example, the rib 221 and the first wall are provided with sealing components to further improve the sealing performance of the exhaust passage 26.

[0290] For example, the rib 221 and the protective plate 22 may be bonded together to improve the sealing and reliability of the exhaust channel 26.

[0291] For example, the rib 221 and the protective plate 22 are provided with sealing components to further improve the sealing performance of the exhaust passage 26.

[0292] Of course, the rib 221 can also be in contact with the first wall and / or the protective plate 22 without being connected by other means, which further improves the assembly efficiency.

[0293] In this embodiment, by sealing the rib 221 with the first wall and / or the protective plate 22, the sealing performance and reliability of the exhaust channel 26 are improved, thereby improving the exhaust efficiency of the exhaust channel 26.

[0294] In some embodiments, please refer to Figures 2 to 4, the protective plate 22 is disposed on one side of the first wall along the third direction, and a confluence region 29 is also formed between the protective plate 22 and the first wall, and the first receiving cavity 23 is connected to the exhaust channel 26 through the confluence region 29.

[0295] In other words, the high-temperature fluid generated by thermal runaway of the battery device 100 can first flow into the confluence region 29 through the pressure relief region 25, and then flow into the exhaust channel 26 through the confluence region 29.

[0296] For example, the confluence area 29 corresponds to all the pressure relief areas 25, that is, the fluid discharged from all the pressure relief areas 25 is discharged into the confluence area 29.

[0297] For example, the projection of all pressure relief areas 25 in the third direction is within the projection range of the confluence area 29 in the third direction.

[0298] In this embodiment, by setting up the confluence region 29, the high-temperature fluid generated by thermal runaway of the battery device 100 can first flow into the confluence region 29 through the pressure relief region 25, and then flow into the exhaust channel 26 through the confluence region 29. This facilitates the rapid flow of the high-temperature fluid into the confluence region 29, thereby minimizing the damage of the high-temperature fluid to other components of the battery device 100 located in the first receiving cavity 23.

[0299] In some embodiments, as shown in FIG3, at least a portion of the exhaust passage 26 is disposed on the periphery of the confluence region 29.

[0300] For example, the exhaust passage 26 may be arranged around the periphery of the confluence region 29.

[0301] Here, "at least some exhaust passages 26 are located on the periphery of the confluence area 29" means that either some exhaust passages 26 are located on the periphery of the confluence area 29, or all exhaust passages 26 are located on the periphery of the confluence area 29.

[0302] In this embodiment, by setting at least a portion of the exhaust channel 26 on the periphery of the confluence region 29, it is beneficial for the fluid in the confluence region 29 to flow into the exhaust channel 26 quickly, thereby reducing turbulence and improving exhaust efficiency. At the same time, it is also beneficial to increase the length of the exhaust channel 26.

[0303] In some embodiments, referring to FIG4, the housing assembly 20 further includes an expansion beam 27, which divides the first receiving cavity 23 to form an electrical compartment 232 and an energy compartment 231. The battery cell 10 is disposed in the energy compartment 231. The electrical compartment 232 and the energy compartment 231 are arranged along a first direction. A confluence region 29 is disposed corresponding to the energy compartment 231. At least a portion of the exhaust channel 26 is disposed on the side of the confluence region 29 near the electrical compartment 232.

[0304] For example, the electrical compartment 232 is used to house the high-voltage and / or low-voltage components of the battery device 100.

[0305] Here, by dividing the first receiving cavity 23 to form an electrical compartment 232 and an energy compartment 231, the battery cell 10 is separated from the electrical components, reducing their mutual influence.

[0306] Here, the flow junction area 29 is set to correspond to the energy storage 231, which allows the high-temperature fluid generated by the battery cell 10 in the energy storage 231 during thermal runaway to flow rapidly into the flow junction area 29.

[0307] At least a portion of the exhaust passage 26 is located on the side of the confluence area 29 near the electrical compartment 232, that is, at least a portion of the exhaust passage 26 and the confluence area 29 are arranged along the first direction.

[0308] This facilitates the separation of the battery cell 10 from the electrical components, reducing their mutual influence. It also allows the high-temperature fluid generated by the battery cell 10 during thermal runaway within the energy chamber 231 to flow rapidly into the confluence area 29, improving exhaust efficiency. Furthermore, it helps to make full use of space, improve structural compactness, and increase the length of the exhaust channel 26, thereby reducing the temperature of the fluid discharged by the battery device 100 due to thermal runaway.

[0309] Referring to Figures 2 to 8, this disclosure also provides a battery device 100, which includes a housing assembly 20, a sealing member 40, and at least one battery cell 10. The housing assembly 20 has a first receiving cavity 23 inside, and the first cavity wall 233 of the first receiving cavity 23 is provided with at least one pressure relief port. The battery cell 10 is disposed within the first receiving cavity 23, and the battery cell 10 includes a first pressure relief mechanism, with the pressure relief port corresponding to the first pressure relief mechanism. The sealing member 40 is located between the battery cell 10 and the first cavity wall 233, and surrounds the first pressure relief mechanism.

[0310] The battery device 100 of this embodiment provides a sealing member 40, which is disposed between the battery cell 10 and the first cavity wall 233 and surrounds the first pressure relief mechanism. This allows the battery cell 10 to be sealed to the first cavity wall 233 through the sealing member 40. In this way, on the one hand, it can improve the situation where adhesives or other substances come into contact with and damage the first pressure relief mechanism during the assembly of the battery device 100, which is beneficial to protecting the first pressure relief mechanism. On the other hand, it can also reduce the impact of high-temperature fluid generated by thermal runaway of the battery cell 10 on adjacent battery cells 10, thereby improving the reliability of the battery device 100.

[0311] In some embodiments, referring to Figures 9 to 10, the battery device 100 further includes a diaphragm 50, which includes a cover portion 53 covering the pressure relief port. The diaphragm 50 also includes a connecting portion 52 located between the seal 40 and the first cavity wall 233.

[0312] In other words, the connecting part 52 of the diaphragm 50 is connected to the seal 40 and the first cavity wall 233. The covering part 53 of the diaphragm 50 can block the pressure relief port and protect the first pressure relief mechanism before the battery cell 10 thermally runs away.

[0313] In some embodiments, as shown in Figures 4 to 8, one pressure relief port corresponds to multiple first pressure relief mechanisms, the seal 40 is configured as a sealing frame surrounding the pressure relief port, and the diaphragm 50 covers multiple pressure relief ports.

[0314] For example, the shape of the sealing frame is adapted to the shape of the pressure relief port.

[0315] Specifically, the sealing frame is rectangular.

[0316] By covering at least multiple pressure relief ports with a diaphragm 50, it is beneficial to reduce the number of diaphragms 50, thereby reducing costs and improving assembly efficiency.

[0317] In some embodiments, as shown in Figures 6 to 12, a heat insulation sheet 60 is provided on the side of the diaphragm 50 facing away from the battery cell 10.

[0318] By providing a heat insulation sheet 60 on the side of the diaphragm 50 away from the battery cell 10, the rebounding particles and airflow will be blocked by the heat insulation sheet 60, that is, the heat insulation sheet 60 can protect the first pressure relief mechanism of the adjacent battery cell 10.

[0319] In this embodiment, by providing a heat insulation sheet 60 on the side of the diaphragm 50 away from the battery cell 10, the rebounding particles and airflow will be blocked by the heat insulation sheet 60. That is, the heat insulation sheet 60 can protect the first pressure relief mechanism of the adjacent battery cell 10 and the diaphragm 50.

[0320] In some embodiments, please refer to Figures 11 and 12, a heat insulation sheet 60 corresponds to multiple pressure relief ports, and a weak portion 62 is provided on the heat insulation sheet 60, the weak portion 62 being located between the regions corresponding to two adjacent pressure relief ports.

[0321] Here, by setting the pressure-bearing capacity of the weak part 62 to be less than the pressure-bearing capacity of other areas of the heat insulation sheet 60 other than the weak part 62, when the high-temperature fluid generated by the thermal runaway of the battery cell 10 acts on the heat insulation sheet 60, the weak part 62 between the heat insulation sheets 60 of the thermal runaway battery cell 10 will break, thereby relieving pressure.

[0322] In this embodiment, by setting the heat insulation sheet 60 to include the weak part 62, it is beneficial to improve assembly efficiency while protecting the first pressure relief mechanism.

[0323] In some embodiments, as shown in Figures 4 to 8, the diaphragm 50 is provided with a recess 51, at least a portion of which is located within a pressure relief port, and at least a portion of the heat insulation sheet 60 is connected to the recess 51.

[0324] For example, the recessed platform 51 is bonded to the heat insulation sheet 60.

[0325] In this embodiment, connecting the settling platform 51 with the heat insulation sheet 60 helps to improve the integrity between the diaphragm 50 and the heat insulation sheet 60, thereby improving the reliability of the battery device 100.

[0326] In some embodiments, referring to Figures 3 to 6, the battery device 100 further includes a heat insulation sheet 60, which is located on the side of the first cavity wall 233 opposite to the first receiving cavity 23.

[0327] By providing a heat insulation sheet 60 on the side of the first cavity wall 233 away from the first receiving cavity 23, the rebounding particles and airflow will be blocked by the heat insulation sheet 60, that is, the heat insulation sheet 60 can protect the first pressure relief mechanism of the adjacent battery cell 10.

[0328] In this embodiment, by providing a heat insulation sheet 60 on the side of the first cavity wall 233 away from the first receiving cavity 23, the rebounding particles and airflow will be blocked by the heat insulation sheet 60. That is, the heat insulation sheet 60 can protect the first pressure relief mechanism and the diaphragm 50 of the adjacent battery cell 10.

[0329] In the description of this disclosure, references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described in this disclosure and the features of the different embodiments or examples without contradiction.

[0330] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A battery device, comprising: A housing assembly, wherein the housing assembly has a first receiving cavity inside, and the first cavity wall of the first receiving cavity is provided with at least one pressure relief area; At least one battery cell is disposed within the first receiving cavity, the battery cell includes a first pressure relief mechanism, and the pressure relief area is disposed corresponding to the first pressure relief mechanism; A sealing element is disposed around the first pressure relief mechanism of at least one of the battery cells, and the battery cell is sealed to the first cavity wall by the sealing element.

2. The battery device of claim 1, wherein, The sealing element corresponds one-to-one with the first pressure relief mechanism.

3. The battery device of claim 1, wherein, The seal is disposed around at least two of the first pressure relief mechanisms.

4. The battery device according to any one of claims 1 to 3, wherein The sealing element is disposed between the battery cell and the first cavity wall.

5. The battery device according to any one of claims 1 to 4, wherein The pressure relief area has a pressure relief port, which is provided corresponding to the first pressure relief mechanism; the battery device also includes a diaphragm, which is provided corresponding to the pressure relief port and covers at least a portion of the pressure relief port.

6. The battery device of claim 5, wherein, One of the diaphragms covers at least two of the pressure relief ports.

7. The battery device of claim 5, wherein, The number of pressure relief regions is multiple, and each pressure relief region includes multiple pressure relief ports. The pressure relief ports of each pressure relief region are arranged linearly along a second direction, and each pressure relief region is arranged along a first direction. The second direction and the first direction intersect. All the pressure relief ports of each pressure relief region correspond to one diaphragm.

8. The battery device according to any one of claims 5 to 7, wherein At least a portion of the diaphragm corresponding to the pressure relief port is sunk in a direction away from the battery cell to form a platform, and at least a portion of the platform is located within the pressure relief port.

9. The battery device according to any one of claims 5 to 8, wherein The side of the seal that is away from the battery cell is disposed on the side of the diaphragm that faces the battery cell.

10. The battery device according to any one of claims 5 to 9, wherein The melting point of the diaphragm is greater than or equal to 85°C and less than or equal to 200°C.

11. The battery device according to any one of claims 5 to 10, wherein The thickness of the diaphragm is greater than or equal to 0.3 mm and less than or equal to 1 mm.

12. The battery device according to any one of claims 5 to 11, wherein The membrane is made of at least one of polypropylene, polycarbonate, or polyethylene terephthalate.

13. The battery device according to any one of claims 1 to 12, wherein The battery device includes a heat insulation sheet disposed on the side of the housing assembly opposite to the first receiving cavity and covering the pressure relief area.

14. The battery device of claim 13, wherein, The heat insulation sheet corresponds one-to-one with the first pressure relief mechanism.

15. The battery device of claim 13, wherein, At least a portion of the heat insulation sheet corresponds to at least two of the first pressure relief mechanisms.

16. The battery device of claim 13, wherein, The heat insulation sheet includes sub-protective layers and weak sections. Adjacent sub-protective layers are connected through the weak sections. Each sub-protective layer corresponds to one of the first pressure relief mechanisms. The pressure-bearing capacity of the weak section is less than the pressure-bearing capacity of other areas of the heat insulation sheet other than the weak section.

17. The battery device of claim 16, wherein, At least a portion of the thickness of the weak section is less than the thickness of other areas of the insulation sheet excluding the weak section; and / or The sub-protective layers are arranged along a second direction, the weak point in the first direction is smaller than the size of other areas of the insulation sheet (excluding the weak point) in the first direction, and the second direction intersects the first direction; and / or, The weak part is provided with at least one weakening hole.

18. The battery device according to any one of claims 13 to 17, wherein, The heat insulation sheet has a heat resistance temperature greater than or equal to 500℃.

19. The battery device according to any one of claims 13 to 18, wherein, The heat insulation sheet is made of at least one of titanium, titanium alloy, carbon fiber, and ceramic silicone rubber.

20. The battery device according to any one of claims 13 to 18, wherein, The heat insulation sheet includes a titanium sheet with a thickness greater than or equal to 0.3 mm and less than or equal to 2 mm.

21. The battery device of claim 8, wherein, The battery device includes a heat insulation sheet disposed on the side of the housing assembly away from the first receiving cavity and covering the pressure relief area, and the sink is connected to the heat insulation sheet.

22. The battery device of any one of claims 1 to 21, wherein, The battery device includes a second pressure relief mechanism disposed on the housing assembly. The housing assembly also includes a second receiving cavity. The second pressure relief mechanism communicates with the second receiving cavity. The first receiving cavity communicates with the second receiving cavity via the pressure relief area.

23. The battery device of claim 22, wherein, The second receiving cavity is provided with an exhaust channel, and the first receiving cavity is connected to the exhaust channel via the pressure relief area. The exhaust channel includes at least one bent section.

24. The battery device of claim 22, wherein, in, The battery device includes a phase change layer disposed within the second receiving cavity.

25. The battery device of any one of claims 22 to 24, wherein, The enclosure assembly includes an enclosure body and a protective plate. The enclosure body includes a first enclosure portion and a second enclosure portion. A first receiving cavity is formed between the first enclosure portion and the second enclosure portion. The protective plate is disposed on the side of the second enclosure portion away from the first receiving cavity and forms a second receiving cavity between it and the second enclosure portion. The second enclosure portion has the pressure relief area.

26. A battery device, wherein, include: A housing assembly, wherein the housing assembly has a first receiving cavity inside, and the first cavity wall of the first receiving cavity is provided with at least one pressure relief port; At least one battery cell is disposed in the first receiving cavity, the battery cell includes a first pressure relief mechanism, and the pressure relief port is disposed corresponding to the first pressure relief mechanism; A sealing element is located between the battery cell and the first cavity wall, and surrounds the first pressure relief mechanism.

27. The battery device of claim 26, wherein, The battery device further includes a diaphragm, the diaphragm including a cover portion that covers the pressure relief port, and the diaphragm also including a connecting portion located between the seal and the first cavity wall.

28. The battery device of claim 27, wherein, One pressure relief port corresponds to multiple first pressure relief mechanisms, the sealing element is configured as a sealing frame, the sealing frame surrounds the pressure relief port, and the diaphragm covers multiple pressure relief ports.

29. The battery device of claim 28, wherein, A heat insulation sheet is provided on the side of the diaphragm opposite to the battery cell.

30. The battery device of claim 29, wherein, Each heat insulation sheet corresponds to multiple pressure relief ports, and the heat insulation sheet is provided with a weak part, which is located between the areas corresponding to two adjacent pressure relief ports.

31. The battery device of claim 30, wherein, The diaphragm is provided with a recessed platform, at least a portion of which is located within the pressure relief port, and at least a portion of the heat insulation sheet is connected to the recessed platform.

32. The battery device of claim 26, wherein, The battery device also includes a heat insulation sheet located on the side of the first cavity wall opposite to the first receiving cavity.

33. An energy storage device comprising a battery device according to any one of claims 1 to 32.

34. An electrical device comprising a battery device according to any one of claims 1 to 32 or an energy storage device according to claim 33.

35. The powered device of claim 34, wherein, The electrical equipment includes aircraft.

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