Battery device and electric appliance

Abstract

The application provides a battery device and an electric device. The battery device comprises a plurality of battery monomers, a heat exchange element and a support structure. The battery monomer comprises a shell, a pressure relief mechanism and at least one electrode assembly. The shell has a containing cavity and comprises a first shell wall. The wall thickness direction of the first shell wall is a first direction. The pressure relief mechanism is arranged on the first shell wall. The electrode assembly is contained in the containing cavity. At least a part of the battery monomers is arranged along a second direction. The second direction intersects the first direction. The heat exchange element is arranged between the battery monomers adjacent along the second direction. The surface of the adjacent battery monomers facing each other and the end surface of the heat exchange element close to the first shell wall along the first direction form a first gap. The support structure is arranged in the first gap and connected with the shell walls of the battery monomers on both sides of the first gap facing the first gap. The application can reduce the risk of fire in the case of thermal runaway.

Description

Technical Field

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

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

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

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

[0005] The technical solution of this application embodiment is implemented as follows: The first aspect of this application provides a battery device, comprising: a plurality of battery cells, each battery cell including a housing, a pressure relief mechanism, and at least one electrode assembly; the housing having a receiving cavity and including a first housing wall, the wall thickness direction of the first housing wall being a first direction; the pressure relief mechanism being disposed on the first housing wall; the electrode assembly being received within the receiving cavity; at least a portion of the battery cells being arranged along a second direction, the second direction intersecting the first direction; a heat exchanger being disposed between adjacent battery cells along the second direction, the surfaces of adjacent battery cells facing each other forming a first gap with the end face of the heat exchanger approaching the first housing wall along the first direction; and a support structure being disposed within the first gap and connected to the housing walls of the battery cells on both sides of the support structure facing the first gap.

[0006] According to the battery device provided in the embodiments of this application, a support structure is provided in the gap on the side where the pressure relief mechanism of the heat exchanger is located. The two end faces of the support structure along the second direction are respectively connected to the surface of the battery cell on both sides of the support structure. In this way, during the thermal runaway expansion of the battery cell, the support structure supports the battery cell, reducing the probability of the outer shell being ruptured. In addition, when the outer shell is concave due to the lack of internal support after eruption, the connection between the support structure and the surface of the outer shell makes it less likely for the shell wall to be concave and deformed, reducing the degree of deformation of the outer shell and thus reducing the probability of the outer shell breaking. This can suppress the aggravation of thermal runaway and reduce the risk of the battery device catching fire.

[0007] In some embodiments, the housing has a weld, and a portion of the weld is located on the surface of the housing facing the first gap. The support structure covers the weld and is connected to the surfaces of the housing facing the first gap and located on opposite sides of the weld.

[0008] In this way, by covering the weld with the support structure and connecting it to the surface of the outer casing facing the first gap and located on both sides of the weld, the structural strength of the outer casing is improved, the probability of weld cracking is reduced, the probability of the outer casing bursting is reduced, and thus the aggravation of thermal runaway can be suppressed, reducing the risk of battery device catching fire.

[0009] In some embodiments, the support structure is bonded to the surfaces of the battery cells on both sides facing the first gap.

[0010] In this way, by covering the weld with the support structure and connecting it to the surface of the outer casing facing the first gap and located on both sides of the weld, the structural strength of the outer casing is improved, the probability of weld cracking is reduced, the probability of the outer casing bursting is reduced, and thus the aggravation of thermal runaway can be suppressed, reducing the risk of battery device catching fire.

[0011] In some embodiments, the support structure is made of adhesive.

[0012] Thus, using adhesives to create the support structure provides it with sufficient structural strength, enabling it to effectively support the outer shell and reduce the risk of breakage. Furthermore, the adhesive bonds firmly to the outer shell, helping to maintain its shape and further minimizing the risk of breakage.

[0013] In some embodiments, the battery device further includes a blocking element that blocks the space between the support structure and the heat exchange element.

[0014] In this way, by setting up the blocking component, the adhesive can be prevented from overflowing between the heat exchange component and the shell, reducing the problem of protrusions forming between the heat exchange component and the shell, which would affect the heat exchange effect and the structural strength of the shell.

[0015] In some embodiments, the blocking member is elastic, and the blocking member is elastically compressed between the housings on both sides thereon.

[0016] In this way, by elastically compressing the blocking component between the outer shells on both sides, the blocking component and the outer shells on both sides have elastic forces, which improves the tightness of the fit between the blocking component and the outer shell, thereby better blocking the adhesive and further reducing the problem of protrusions forming between the heat exchange component and the outer shell, which would affect the heat exchange effect and the structural strength of the outer shell.

[0017] In some embodiments, at least one of the two opposing surfaces of the blocking member along the second direction is bonded to the battery cell.

[0018] Thus, by bonding the blocking component to at least one battery cell, the relative position between the blocking component and the battery cell can be better maintained. This allows the blocking component to better prevent adhesive overflow and reduces the formation of protrusions between the heat exchange component and the battery cell, which could affect heat exchange efficiency and the structural strength of the casing. Furthermore, during the assembly of the battery device, the blocking component can be bonded to one battery cell first, and then that battery cell can be aligned and assembled with other battery cells, improving the ease of assembly and the accuracy of alignment.

[0019] In some embodiments, the surface of the support structure facing away from the heat exchanger along the first direction is flush with the outer surfaces of the first shell walls on both sides.

[0020] This design allows the support structure to connect with the outer casing on both sides over the largest possible area, maintaining the shape of the casing as much as possible, thereby reducing the chance of casing breakage and suppressing the escalation of thermal runaway, thus reducing the risk of battery fire. Furthermore, the support structure does not extend beyond the outer surface of the first casing wall, which helps to minimize its impact on the internal space of the battery box and improves space utilization.

[0021] In some embodiments, the dimension of the support structure along the first direction is greater than or equal to 2 mm and less than or equal to 3 mm.

[0022] Thus, by limiting the dimension of the support structure along the first direction to a range of greater than or equal to 2 mm and less than or equal to 3 mm, the connection area between the support structure and the outer casing is sufficiently large, improving the structural strength of the outer casing, reducing the probability of casing breakage, and thereby suppressing the escalation of thermal runaway and reducing the risk of battery fire. Furthermore, ensuring that the dimension of the support structure along the first direction is not too large ensures that the contact area between the heat exchange component and the outer casing is sufficiently large to meet heat exchange requirements.

[0023] In some embodiments, the battery device further includes a battery box having an enclosed space, in which battery cells are located. The box wall enclosing the enclosed space includes a first box wall, which carries the battery cells from one side in a first direction. The battery cells are arranged with their first shell walls facing the first box wall. The first box wall has a plurality of vent holes. Each battery cell has a pressure relief mechanism with at least one vent hole arranged opposite to it in the first direction. The battery box further includes a first barrier, with at least one first barrier on the side of each support structure facing away from the heat exchanger. The first barrier contacts the surface of the first box wall facing the enclosed space and the support structure, and / or contacts a portion of the outer surface of two first shell walls adjacent in the second direction. The first barrier avoids the pressure relief mechanism and the vent holes.

[0024] Thus, by arranging the battery cells with their first shell walls facing the first housing wall, and with the pressure relief mechanism of each battery cell facing at least one vent hole on the first housing wall, thermal runaway materials within the battery cells can be quickly discharged through the vent holes corresponding to the pressure relief mechanisms of those battery cells, improving pressure relief efficiency. Furthermore, the first barrier ensures that emissions from each battery cell are discharged through their respective vent holes, preventing them from easily escaping into the vent space between the first shell walls and the first housing wall of adjacent battery cells. This reduces the impact on other battery cells, helps suppress the spread and escalation of thermal runaway, and thereby lowers the risk of fire in the battery device.

[0025] In some embodiments, the first barrier is elastic and is elastically compressed between the first box wall and the support structure.

[0026] In this way, by elastically compressing the first barrier between the first housing wall and the supporting structure, the first barrier and the first housing wall and supporting structure on both sides have elastic forces, which improves the tightness of the fit between the first barrier and the first housing wall and supporting structure, thereby better blocking the emissions and further reducing the possibility of emissions escaping into the exhaust space between adjacent battery cells and the first housing wall. This helps to reduce the impact on other battery cells, suppress the spread and aggravation of thermal runaway, and thus reduce the risk of battery fire.

[0027] In some embodiments, the battery box further includes a sealing element, the vent being closed by the sealing element, and the vent opening when the pressure or temperature on the sealing element reaches a predetermined threshold.

[0028] Thus, by using the sealing component, when the battery pack is in normal operation, dust particles from outside the battery pack are less likely to enter the enclosed space of the battery pack through the vents, reducing the impact on individual battery cells and electrical connectors inside the battery pack and improving the reliability of the battery pack. In the event of thermal runaway in some battery cells, the portion of the sealing component blocking the vents corresponding to those battery cells ruptures, allowing these vents to open and discharge any emissions from the battery cells.

[0029] In some embodiments, at least a portion of the vents arranged along the second direction are sealed by the same sealing member, and the first barrier is bonded to the surface of the sealing member facing the enclosed space.

[0030] This helps reduce the number of parts, improves assembly efficiency, and also enhances structural strength.

[0031] In some embodiments, the sealing member has a recessed portion formed on the surface facing the battery cell, the recessed portion is disposed opposite to the pressure relief mechanism along a first direction, and a plurality of recessed portions are spaced apart along a second direction, and a first barrier member is bonded to the surface of the sealing member located between adjacent recessed portions.

[0032] In this way, by forming a recessed portion, there is a gap between the sealing component and the pressure relief mechanism along the first direction, reducing the possibility that the setting of the sealing component will affect the normal opening of the pressure relief mechanism, thereby enabling the battery cell to release gas smoothly.

[0033] In some embodiments, the battery device further includes a second barrier member, the edge of the surface of the sealing member facing the battery cell is connected to the second barrier member, the second barrier member is in contact with the first shell wall of the battery cell, the first barrier member extends along a third direction and both ends of the first barrier member are in contact with the second barrier member, the third direction intersects with the first direction and the second direction and is not coplanar.

[0034] Thus, the second barrier and the first barrier work together to form a barrier structure around the pressure relief mechanism, which is used to prevent the emissions from the pressure relief mechanism from escaping to the surroundings, so that the emissions can break through the sealing parts and be discharged through the exhaust port, thereby achieving directional exhaust of the emissions and improving exhaust efficiency.

[0035] In some embodiments, the second barrier is elastic and is elastically compressed between the sealing member and the outer surface of the first shell wall.

[0036] In this way, by elastically compressing the second barrier between the sealing member and the outer surface of the first shell wall, the second barrier and the sealing members on both sides of it have elastic forces with the first shell wall, which improves the tightness of the fit between the second barrier, the sealing member and the first shell wall, thereby better blocking the emissions, further reducing the possibility of emissions escaping to the surroundings, which helps to reduce the impact on other battery cells, and helps to suppress the spread and aggravation of thermal runaway, thereby reducing the risk of battery fire.

[0037] In some embodiments, the first casing wall is located below the battery cell.

[0038] This allows emissions to be discharged downwards through the vents, reducing the impact on electrical components above the battery cells and improving the operational reliability of the battery system.

[0039] In some embodiments, the battery box further includes a protective plate located on the side of the first box wall facing away from the enclosed space along a first direction, and forming a pressure relief cavity between the protective plate and the first box wall. The protective plate forms a vent hole, and the pressure relief cavity communicates with the external space through the vent hole.

[0040] In this way, by forming a pressure relief chamber, the emissions from multiple battery cells can be collected in the pressure relief chamber and then discharged through the vent hole. This helps to extend the emission path of the emissions, reduce the temperature of the emissions discharged through the vent hole, and lower the risk of emissions igniting.

[0041] In some embodiments, the electrode assembly includes a positive electrode sheet, which includes a positive active material, and the positive active material is lithium nickel cobalt manganese oxide.

[0042] The battery cells are ternary lithium batteries. Ternary lithium batteries produce a large amount of gas, and the casing is more prone to deformation. Therefore, by setting up a support structure, the deformation of the casing can be effectively suppressed, reducing the probability of casing breakage. This can suppress the aggravation of thermal runaway and reduce the risk of battery device fire.

[0043] The second aspect of this application provides an electrical device, comprising: an electrical device; and a battery device provided in the first aspect, the battery device being used to supply power to the electrical device.

[0044] Because the electrical equipment includes a battery device, and because the electrical equipment includes all the beneficial effects of the battery device, the electrical equipment can reduce the risk of fire in the event of thermal runaway.

[0045] In some embodiments, the electrical equipment includes an aircraft, the aircraft including a battery device and a body as the electrical equipment, the body having a battery housing, the battery device being installed in the battery housing.

[0046] Therefore, the risk of the aircraft catching fire in the event of thermal runaway is low. Attached Figure Description

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of an electrical device (aircraft) according to one or more embodiments; Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments; Figure 3 A three-dimensional structural schematic diagram of a battery cell according to one or more embodiments; Figure 4 This is an exploded perspective view of a battery cell according to one or more embodiments; Figure 5This is a top view of a portion of the structure of a battery device according to one or more embodiments, illustrating the battery cell and heat exchanger. Figure 6 for Figure 5 Sectional view at point AA; Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 This is a top view of a battery device according to one or more embodiments, with the case cover removed. Figure 9 for Figure 8 Sectional view at CC; Figure 10 for Figure 9 Enlarged view of point D in the middle; Figure 11 This is an exploded perspective view of the housing of a battery device according to one or more embodiments; Figure 12 for Figure 11 Enlarged view of point E in the middle.

[0048] Explanation of reference numerals in the attached figures 1000. Aircraft; 100. Battery unit; 200. Airframe; 200a. Electrical unit; 1. Battery box; 10. Enclosed space; 20. Pressure relief chamber; 11. Box body; 111. First box wall; 1111. Exhaust port; 1112. Connecting rib; 112. Protective plate; 1121. Vent hole; 113. First barrier; 114. Sealing component; 1141. Protrusion; 1142. Recess; 115. 12. Second barrier; 2. Box cover; 2. Battery cell; 21. Outer shell; 211. Housing; 2111. First shell wall; 2112. Second shell wall; 2113. Third shell wall; 212. End cap; 213. Weld; 22. Electrode assembly; 23. Pressure relief mechanism; 24. Terminal post; 25. Insulating film; 3. Heat exchanger; 4. Support structure; 5. Barrier; X, First direction; Y, Second direction; Z, Third direction.

[0049] It should be noted that the terms "first" and "second" mentioned above are only used to distinguish between different options and do not represent the degree of superiority or inferiority of the options or their priority in the implementation process. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0053] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0055] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0056] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0057] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0058] The following is a detailed description of this application.

[0059] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0060] In related technologies, when a battery cell in a battery device experiences thermal runaway, the cell's casing is prone to deformation and cracking, leading to a short circuit and potentially causing a fire or explosion. Therefore, this application designs a battery device that can suppress the escalation of thermal runaway by reducing casing cracking.

[0061] This application designs a battery device, which includes multiple battery cells, a heat exchanger, and a support. Each battery cell includes a housing, a pressure relief mechanism, and at least one electrode assembly. The housing has a receiving cavity and includes a first housing wall. The wall thickness direction of the first housing wall is a first direction. The pressure relief mechanism is disposed on the first housing wall. The electrode assembly is received in the receiving cavity. At least a portion of the battery cells are arranged along a second direction, which intersects the first direction. The heat exchanger is disposed between adjacent battery cells along the second direction. The surfaces of adjacent battery cells facing each other and the end face of the heat exchanger near the first housing wall along the first direction form a first gap. The support structure is supported in the first gap along the second direction and is connected to the housing walls of the battery cells on both sides facing the first gap.

[0062] According to this design, a support structure is provided in the gap on the side where the pressure relief mechanism of the heat exchange component is located between adjacent battery cells along the second direction. The two opposing surfaces of the support structure along the second direction are respectively connected to the surfaces of the battery cells on both sides of the support structure. In this way, during the thermal runaway expansion of the battery cells, the support structure supports the battery cells, reducing the probability of the outer shell being ruptured. In addition, when the outer shell is concave due to the lack of internal support after eruption, the connection between the support structure and the surface of the outer shell makes it less likely for the shell wall to deform inward, reducing the degree of deformation of the outer shell and thus reducing the probability of the outer shell breaking. This can suppress the aggravation of thermal runaway and reduce the risk of fire in the battery device.

[0063] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0064] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0065] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0066] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more individual battery cells housed within the battery case.

[0067] As an example, a battery cell assembly can be a battery module, which can be housed in a battery case by fixing the battery module in the battery case.

[0068] As an example, battery cell assemblies can also be housed in a battery box by directly fixing multiple battery cells to the battery box.

[0069] In some embodiments, the battery box may be part of the vehicle's chassis structure. For example, a portion of the battery box may be at least a part of the vehicle's floor, or a portion of the battery box may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0070] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0071] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0072] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0073] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0074] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0075] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi).1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0077] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0078] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0079] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0081] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0082] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0083] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not contain a negative electrode active material.

[0084] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0085] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0086] The technical solutions described in the embodiments of this application are applicable to electrical devices that use battery devices. The electrical devices include the battery devices of any embodiment of this application, and the battery devices are used to provide electrical energy.

[0087] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, aircraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Aircraft generally refer to machines that fly within the atmosphere or in outer space, including aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special restrictions on the aforementioned electrical equipment.

[0088] It should be noted that the technical solutions described in the embodiments of this application are not limited to the electrical equipment described above, but can also be applied to all electrical equipment including battery devices and energy storage devices. However, for the sake of brevity, the following embodiments are all described using aircraft as an example.

[0089] Figure 1 A schematic diagram of the structure of an electrical device (aircraft) according to one or more embodiments; Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments.

[0090] Reference Figure 1 The aircraft 1000 typically includes a battery unit 100 and an airframe 200, with the battery unit 100 located in the airframe 200 and providing electrical power to the airframe 200.

[0091] like Figure 2 As shown, the battery device 100 includes a battery box 1 and at least one battery cell 2. The battery box 1 has a closed space, and the at least one battery cell 2 is housed in the closed space.

[0092] In some embodiments of this application, the battery box 1 may include a cover 12 and a body 11. The cover 12 and the body 11 are fastened together, forming a closed space inside the battery box 1 to accommodate the individual battery cells 2. Here, "closed" refers to covering or closing, and can be either sealed or unsealed.

[0093] The housing 11 can be a hollow structure with one open end, and the lid 12 can be a plate-like structure. The lid 12 closes onto the open side of the housing 11 so that the lid 12 and the housing 11 together define a closed space. Alternatively, both the lid 12 and the housing 11 can be hollow structures with one open end, with the open side of the lid 12 closing onto the open side of the housing 11. Of course, the battery box 1 formed by the lid 12 and the housing 11 can be of various shapes, such as a cylinder, a cuboid, etc.

[0094] In the battery device 100, there can be multiple battery cells 2, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 2 are connected in both series and parallel configurations. Multiple battery cells 2 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 2 is placed in the enclosed space formed by the housing 11 and the cover 12. Alternatively, the battery device 100 can also consist of multiple battery cells 2 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the enclosed space formed by the housing 11 and the cover 12. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 2.

[0095] In this embodiment, the battery cell 2 can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0096] The battery cell 2 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0097] As an example, the battery cell 2 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0098] Below, refer to Figures 3 to 12 Some embodiments of this application will be described in detail.

[0099] Figure 3 A three-dimensional structural schematic diagram of a battery cell according to one or more embodiments; Figure 4 This is an exploded perspective view of a battery cell according to one or more embodiments; Figure 5 This is a top view of a portion of the structure of a battery device according to one or more embodiments, illustrating the battery cell and heat exchanger. Figure 6 for Figure 5Sectional view at point AA; Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 This is a top view of a battery device according to one or more embodiments, with the case cover removed. Figure 9 for Figure 8 Sectional view at CC; Figure 10 for Figure 9 Enlarged view at point D; Figure 11 This is an exploded perspective view of the housing of a battery device according to one or more embodiments; Figure 12 for Figure 11 Enlarged view of point E in the middle.

[0100] In some embodiments of this application, for ease of explanation, a first direction, a second direction, and a third direction are defined. These three directions intersect each other; here, intersecting each other includes perpendicularly intersecting each other. For ease of understanding of the embodiments of this application, in... Figures 2 to 12 In the illustrated embodiment, the first direction, the second direction, and the third direction are given as examples where they intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. For ease of explanation, as follows... Figures 2 to 12 As shown by the arrows in the diagram, the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction. Sometimes, the direction that arrow X points to along the first direction is called "above", and its opposite direction is called "below".

[0101] The first aspect of this application provides a battery device 100, such as Figures 2 to 7 As shown, the battery device 100 includes multiple battery cells 2, heat exchange components 3, and a support structure 4. Each battery cell 2 includes a housing 21, a pressure relief mechanism 23, and at least one electrode assembly 22. The housing 21 has a receiving cavity and includes a first housing wall 2111. The wall thickness direction of the first housing wall 2111 is a first direction X. The pressure relief mechanism 23 is disposed on the first housing wall 2111. The electrode assembly 22 is accommodated in the receiving cavity. At least a portion of the battery cells 2 are arranged along a second direction Y, which intersects with the first direction X. The heat exchange component 3 is disposed between adjacent battery cells 2 along the second direction Y. The surfaces of adjacent battery cells 2 facing each other and the end face of the heat exchange component 3 near the first housing wall 2111 along the first direction X form a first gap. The support structure 4 is disposed in the first gap and is connected to the housing walls of the battery cells 2 on both sides facing the first gap.

[0102] It is understandable that "the end of the heat exchanger 3 that is close to the first shell wall 2111 along the first direction X" refers to the end of the heat exchanger 3 that is close to the first shell wall 2111 along the first direction X.

[0103] Electrode assembly 22 is the component in the battery cell 2 where the electrochemical reaction occurs. The housing 21 may contain one or more electrode assemblies 22. Electrode assembly 22 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrode. The positive electrode includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector. The positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collector portion and a positive current collector protruding from the positive current collector portion. The positive current collector portion is coated with the positive active material layer, and at least a portion of the positive current collector protruding from the positive current collector portion is not coated with the positive active material layer, serving as a positive electrode tab. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector, the negative active material layer being coated on the surface of the negative current collector; the negative current collector includes a negative current collector portion and a negative current convex portion protruding from the negative current collector portion, the negative current collector portion being coated with the negative active material layer, at least a portion of the negative current convex portion not being coated with the negative active material layer, the negative current convex portion serving as a negative electrode tab.

[0104] For example, such as Figure 4 As shown, at least two electrode assemblies 22 are provided. The at least two electrode assemblies 22 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that at least two electrode assemblies 22 are connected in both series and parallel. The at least two electrode assemblies 22 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly consisting of the at least two electrode assemblies 22 is placed in a receiving cavity surrounded by multiple shell walls.

[0105] The outer casing 21 is a component with a receiving cavity isolated from the external environment. This cavity is used to house the electrode assembly 22, electrolyte, and other components. The outer casing 21 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite casing 21), or aluminum-plastic film, etc. In some embodiments, the outer casing 21 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 21 is a non-sealed structure, it serves to protect the electrode assembly 22. A sealing bag is also included between the outer casing 21 and the electrode assembly 22, used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 21 is a sealed structure, it is used to encapsulate the electrode assembly 22 and electrolyte, etc. Exemplarily, the outer casing 21 can be cylindrical or prismatic. Prismatic shapes include square shells, blade shapes, and multi-faceted prisms, such as hexagonal prisms, etc. This application does not have any particular limitations.

[0106] It is understood that the outer shell 21 includes multiple shell walls that form a receiving cavity, and the multiple shell walls include a first shell wall 2111.

[0107] For example, such as Figure 4As shown, the outer casing 21 includes an end cap 212 and a housing 211. The housing 211 has an opening, and the end cap 212 covers the opening. The housing 211 may have one or more openings. The end cap 212 may also have one or more. The end cap 212 is a shell wall, which can serve as a first shell wall 2111. The housing 211 is formed by connecting multiple other shell walls, and one shell wall of the housing 211 can serve as the first shell wall 2111. Exemplarily, a pressure relief mechanism 23 is provided on the end cap 212 and / or the housing 211.

[0108] The pressure relief mechanism 23 is used to release internal gas from the battery cell 2. As an example, it is actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 2 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 2 reaches the predetermined threshold, the pressure relief mechanism 23 performs an action, or a weak structure provided in the pressure relief mechanism 23 is broken, thereby forming an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 2.

[0109] As an example, the pressure relief mechanism 23 can be integrally formed with the housing 21.

[0110] As an example, the pressure relief mechanism 23 can also be separately configured and connected to the housing 21.

[0111] The term "actuation" as used in this application refers to the pressure relief mechanism 23 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 2. The actions of the pressure relief mechanism 23 may include, but are not limited to: movement of components within the pressure relief mechanism 23 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 23, etc. When the pressure relief mechanism 23 is actuated, the high-temperature, high-pressure substances inside the battery cell 2 are discharged outwards from the actuated portion as exhaust materials. This method enables pressure and temperature relief of the battery cell 2 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0112] For example, the battery cell 2 also includes a terminal post 24, which is electrically connected to the electrode assembly 22 for outputting or inputting electrical energy. The terminal post 24 may be located on the same shell wall as the pressure relief mechanism 23, that is, the terminal post 24 is located on the first shell wall 2111; the terminal post 24 may also be located on a different shell wall from the pressure relief mechanism 23, that is, the terminal post 24 is located on one or two other shell walls of the outer shell 21 other than the first shell wall 2111.

[0113] The heat exchanger 3 is a structural component with flow channels for the flow of heat exchange medium. The heat exchange medium flowing within the channels can cool the battery cell 2 when its temperature rises, or heat it when its temperature falls. By controlling the temperature of the battery cell 2 within the flow channels, the heat exchange medium keeps the temperature of the battery cell 2 within a suitable temperature range, thereby improving the performance of the battery device 100 and extending its service life. For example, the heat exchanger 3 can be a liquid cooling plate.

[0114] The heat exchange medium can be a liquid or a gas. Liquid heat exchange media can be polyol-based coolants such as ethylene glycol or glycerol water, or water-based coolants. Gas heat exchange media can be air, ammonia, nitrogen, hydrogen, carbon dioxide, or alcohol vapor.

[0115] For example, the heat exchanger 3 is bonded to the battery cell 2 in contact with it via an adhesive layer. The adhesive layer is made of thermally conductive adhesive.

[0116] It is understandable that a portion of the surface of the battery cell 2 facing the shell wall of the heat exchanger 3 is in contact with the heat exchanger 3, while the remaining portion is not in contact with the heat exchanger 3. The first gap is formed between the surfaces of adjacent battery cells 2 that are not in contact with the heat exchanger 3.

[0117] The support structure 4 is a structural component that supports the facing shell walls of adjacent battery cells 2. The support structure 4 has a certain degree of rigidity and can support the facing shell walls of adjacent battery cells 2. The material of the support structure 4 can be, but is not limited to, plastics, such as polyethylene terephthalate (PET), polycarbonate (PC), polyamide (PA), polybutylene terephthalate (PBT), etc. For example, the plastic is bonded to the shell wall of the battery cell 2 by an adhesive. The material of the support structure 4 can also be an adhesive that has a certain degree of rigidity after solidification, such as, but not limited to, structural adhesives, for example, epoxy resin adhesives, acrylic structural adhesives, etc.

[0118] It should be noted that the support structure 4 is connected to the shell walls of the battery cells 2 on both sides facing the first gap. This "connection" indicates that there is a certain connection strength between the support structure 4 and the shell walls of the battery cells 2 facing the first gap. When the shell wall deforms away from the support structure 4, the support structure 4 pulls the shell wall, which can suppress the degree of deformation of the shell wall towards the receiving cavity. Furthermore, when the shell wall deforms towards the support structure 4, the support of the support structure 4 suppresses the degree of deformation of the shell wall towards the first gap. For example, the connection between the support structure 4 and the shell wall can be adhesive or mechanical locking force such as snap-fit.

[0119] According to the battery device 100 provided in the embodiments of this application, a support structure 4 is provided in the gap on the side where the pressure relief mechanism 23 of the heat exchange component 3 between adjacent battery cells 2 is located along the second direction Y. The two opposing surfaces of the support structure 4 along the second direction Y are respectively connected to the surfaces of the battery cells 2 on both sides of the support structure 4. In this way, during the thermal runaway expansion of the battery cells 2, the support structure 4 provides support for the battery cells 2, reducing the probability of the outer shell 21 being ruptured. In addition, when the outer shell 21 is concave due to the lack of internal support after eruption, the connection between the support structure 4 and the surface of the outer shell 21 makes it less likely for the shell wall to be concave and deformed, reducing the degree of deformation of the outer shell 21, thereby reducing the probability of the outer shell 21 breaking, and thus suppressing the aggravation of thermal runaway and reducing the risk of the battery device 100 catching fire.

[0120] In some embodiments, such as Figure 7 As shown, the outer shell 21 has a weld 213, and a portion of the weld 213 is located on the surface of the outer shell 21 facing the first gap. The support structure 4 covers the weld 213 and is connected to the surfaces of the outer shell 21 facing the first gap and located on opposite sides of the weld 213.

[0121] For example, the outer casing 21 includes an end cap 212 and a housing 211. The housing 211 has an opening at one end along a first direction X, and the end cap 212 closes the opening. The end cap 212 is provided with a pole post 24. The housing 211 is formed by connecting multiple shell walls. One of the multiple shell walls of the housing 211 serves as a first shell wall 2111. The first shell wall 2111 is welded to the other shell walls of the housing 211. A portion of the weld 213 formed is located on the surface of the housing 21 facing the first gap, and the portion of the weld 213 facing the first gap is covered by the support structure 4.

[0122] For example, such as Figure 4 As shown, the shell wall of the housing 211 that is opposite to the end cap 212 along the first direction X is called the first shell wall 2111. The housing 211 includes two second shell walls 2112 that are opposite to each other along the second direction Y. One end face of the second shell wall 2112 along the first direction X is welded to the surface of the first shell wall 2111. The weld 213 formed is located on the surface of the housing 21 facing the first gap. The support structure 4 is connected to the surfaces of the second shell wall 2112 and the first shell wall 2111 facing the first gap.

[0123] For example, such as Figure 4 As shown, the housing 211 also includes two third housing walls 2113 opposite each other in the third direction Z. The two third housing walls 2113, the two second housing walls 2112 and the first housing wall 2111 are connected to form the housing 211. The two third housing walls 2113 and the two second housing walls 2112 form an opening at the end away from the first housing wall 2111, and the end cap 212 closes the opening.

[0124] For example, among all the shell walls of the outer shell 21, the outer surface area of ​​the second shell wall 2112 is the largest.

[0125] For example, such as Figure 7 As shown, the outer surface of the housing 21 is covered with an insulating film 25. For example, the insulating film 25 is bonded to the outer surface of the housing 21, the support structure 4 is bonded to the outer surface of the insulating film 25, and the support structure 4 is bonded to the surfaces of the insulating film 25 facing the first gap and located on opposite sides of the weld 213.

[0126] For example, the insulating film 25 covers the outer surface of the first shell wall 2111 from the outer surface of the second shell wall 2112. The insulating film 25 covers the weld 213 between the second shell wall 2112 and the first shell wall 2111.

[0127] Thus, by covering the weld 213 with the support structure 4 and connecting it to the surfaces of the outer casing 21 facing the first gap and located on opposite sides of the weld 213, the structural strength of the outer casing 21 is improved, the probability of the weld 213 cracking is reduced, the probability of the outer casing 21 bursting is reduced, and the aggravation of thermal runaway can be suppressed, thereby reducing the risk of the battery device 100 catching fire.

[0128] Of course, it is understood that the housing 21 is not limited to having a weld 213 on the surface facing the first gap. In some embodiments, the surface of the housing 21 facing the first gap does not have a weld 213.

[0129] In some embodiments, such as Figure 7 As shown, the support structure 4 and the surfaces of the battery cells 2 on both sides facing the first gap are bonded together.

[0130] For example, the support structure 4 is bonded to the second shell walls 2112 of the battery cells 2 on both sides of it.

[0131] This configuration allows the support structure 4 to function on both sides of the battery cells 2, further suppressing the aggravation of thermal runaway and reducing the risk of fire in the battery device 100.

[0132] In some embodiments, the support structure 4 is made of an adhesive.

[0133] For example, the adhesive may be, but is not limited to, structural adhesive. For example, the structural adhesive may be, but is not limited to, polyurethane structural adhesive, epoxy structural adhesive, or acrylic structural adhesive.

[0134] Specifically, the adhesive fills the first gap.

[0135] Thus, by using an adhesive to create the support structure 4, the support structure 4 has a certain structural strength, which can effectively support the outer shell 21 and reduce the risk of the outer shell 21 breaking. Furthermore, the adhesive can be firmly bonded to the outer shell 21, thereby helping to maintain the shape of the outer shell 21 and reducing the risk of the outer shell 21 breaking.

[0136] In some embodiments, such as Figure 7 As shown, the battery device 100 also includes a blocking member 5, which blocks the space between the support structure 4 and the heat exchange member 3.

[0137] The blocking member 5 is a structural member that blocks the space between the support structure 4 and the heat exchange member 3. The blocking member 5 is in contact with the outer shell 21 on both sides, so that the blocking member 5 prevents the adhesive from overflowing between the heat exchange member 3 and the outer shell 21, thereby reducing the formation of protrusions between the heat exchange member 3 and the outer shell 21, which would affect the heat exchange effect and the structural strength of the outer shell 21.

[0138] For example, at least one of the two surfaces of the blocking member 5 opposite each other along the second direction Y is bonded to the outer surface of the battery cell 2.

[0139] For example, the blocking element 5 is an insulating element. For example, the insulating element can be, but is not limited to, foam. For example, silicone rubber foam, EPDM rubber foam, neoprene rubber foam, nitrile rubber foam, natural rubber foam, polyethylene foam, polypropylene foam, polystyrene foam, etc.

[0140] Thus, by setting the blocking member 5, the adhesive can be prevented from overflowing between the heat exchanger 3 and the outer shell 21, reducing the formation of protrusions between the heat exchanger 3 and the outer shell 21 that would affect the heat exchange effect and the structural strength of the outer shell 21.

[0141] In some embodiments, such as Figure 7 As shown, the blocking member 5 is elastic and is elastically compressed between the outer shells 21 on both sides.

[0142] For example, the blocking element 5 may be made of, but is not limited to, foam. For example, silicone rubber foam, EPDM rubber foam, neoprene rubber foam, nitrile rubber foam, natural rubber foam, polyethylene foam, polypropylene foam, polystyrene foam, etc.

[0143] Thus, by elastically compressing the blocking member 5 between the outer shells 21 on both sides, the blocking member 5 and the outer shells 21 on both sides have elastic forces, which improves the tightness of the fit between the blocking member 5 and the outer shells 21, thereby better blocking the adhesive and further reducing the impact of the protrusions formed between the heat exchange member 3 and the outer shell 21 on the heat exchange effect and the structural strength of the outer shell 21.

[0144] Of course, it is understood that the blocking element 5 is not limited to being elastic. In some embodiments, the blocking element 5 can be a structural member with high rigidity and no elasticity.

[0145] In some embodiments, at least one of the two surfaces of the blocking member 5 opposite each other along the second direction Y is bonded to the battery cell 2.

[0146] Thus, by bonding the blocking member 5 to at least one battery cell 2, the relative position between the blocking member 5 and the battery cell 2 can be better maintained. This allows the blocking member 5 to better prevent adhesive overflow, reducing the problem of protrusions forming between the heat exchanger 3 and the battery cell 2, which would affect the heat exchange effect and the structural strength of the casing 21. Furthermore, during the assembly of the battery device 100, the blocking member 5 can be bonded to one battery cell 2 first, and then that battery cell 2 can be aligned and assembled with other battery cells 2, which improves the ease of assembly and the accuracy of alignment.

[0147] Of course, it is understood that the blocking member 5 is not limited to being bonded to the battery cell 2. In some embodiments, the blocking member 5 is only attached to the battery cell 2, but not bonded.

[0148] In some embodiments, such as Figure 7 As shown, the surface of the support structure 4 facing away from the heat exchanger 3 along the first direction X is flush with the outer surface of the first shell wall 2111 on both sides.

[0149] In this way, the support structure 4 can connect with the outer casing 21 on both sides over the largest possible area, maintaining the shape of the outer casing 21 as much as possible, thereby reducing the probability of the outer casing 21 breaking and thus suppressing the aggravation of thermal runaway, reducing the risk of fire in the battery device 100. Furthermore, the support structure 4 does not extend beyond the outer surface of the first shell wall 2111, which helps to suppress the occupation of the support structure 4 in the internal space of the battery box 1 and improves space utilization.

[0150] Of course, it is understood that the support structure 4 is not limited to being flush with the outer surface of the first shell wall 2111. In some embodiments, the entire support structure 4 is located within the first gap, and the surface of the support structure 4 facing away from the heat exchanger 3 has a distance from the outer surface of the first shell wall 2111.

[0151] In some embodiments, such as Figure 7 As shown, the dimension L of the support structure 4 along the first direction X is greater than or equal to 2 mm and less than or equal to 3 mm.

[0152] For example, the dimension L of the support structure 4 along the first direction X can be, but is not limited to, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm or any data between two adjacent data.

[0153] Thus, by limiting the dimension L of the support structure 4 along the first direction X to a range greater than or equal to 2 mm and less than or equal to 3 mm, the connection area between the support structure 4 and the outer casing 21 is sufficiently large, improving the structural strength of the outer casing 21, reducing the probability of the outer casing 21 breaking, thereby suppressing the aggravation of thermal runaway and reducing the risk of fire in the battery device 100. Furthermore, by ensuring that the dimension of the support structure 4 along the first direction X is not too large, the contact area between the heat exchanger 3 and the outer casing 21 is sufficiently large to meet heat exchange requirements.

[0154] Of course, it is understood that the dimension L of the support structure 4 along the first direction X is not limited to greater than or equal to 2 mm and less than or equal to 3 mm. In some embodiments, the dimension L of the support structure 4 along the first direction X can be less than 2 mm or greater than 3 mm.

[0155] In some embodiments, such as Figures 8 to 11 As shown, the battery device 100 also includes a battery box 1, which has a closed space 10. The battery cell 2 is located in the closed space 10. The box wall of the battery box 1 that forms the closed space 10 includes a first box wall 111. The first box wall 111 carries the battery cell 2 from one side in the first direction X. The battery cell 2 is arranged with the first shell wall 2111 facing the first box wall 111. The first box wall 111 forms a plurality of vent holes 1111. The pressure relief mechanism 23 of each battery cell 2 is provided with at least one vent hole 1111 opposite to each other in the first direction X. The battery box 1 also includes a first barrier 113. Each support structure 4 is provided with at least one first barrier 113 on the side away from the heat exchanger 3. The first barrier 113 is in contact with the surface of the first box wall 111 facing the closed space 10. The first barrier 113 is in contact with the support structure 4 and / or with a portion of the outer surface of the two first shell walls 2111 adjacent to the second direction Y. The first barrier 113 avoids the pressure relief mechanism 23 and the vent holes 1111.

[0156] The first barrier 113 is a structural component used to block the space enclosed by adjacent battery cells 2 and the first casing wall 111, so that the emissions emitted by each battery cell 2 are discharged outward from the vent 1111 corresponding to its respective pressure relief mechanism 23, and are not easily dispersed into the vent space between the first casing wall 2111 and the first casing wall 111 of other battery cells 2, thus reducing the impact on other battery cells 2. The first barrier 113 can be an elastic component or a non-elastic component, as long as it can prevent the emission from dissipating.

[0157] For example, the first barrier 113 may be, but is not limited to, foam. Examples include silicone rubber foam, EPDM rubber foam, neoprene rubber foam, nitrile rubber foam, natural rubber foam, polyethylene foam, polypropylene foam, polystyrene foam, etc.

[0158] For example, the size of the first barrier 113 along the second direction Y is larger than the size of the support structure 4. A portion of the first barrier 113 contacts the support structure 4. Both ends of the first barrier 113 along the second direction Y extend beyond the support structure 4, and the two extended portions respectively contact a portion of the outer surface of the first shell wall 2111 of the battery cell 2 located on both sides of the support structure 4.

[0159] For example, the dimension of the first barrier 113 along the second direction Y is smaller than the dimension of the support structure 4, and the surface of the first barrier 113 facing away from the first box wall 111 is in contact with the support structure 4.

[0160] It should be noted that "contact" should be interpreted broadly. It can be direct contact, contact through an intermediate medium, contact between two parties with virtually no interaction force, or contact between two parties with interaction force.

[0161] Optionally, the first barrier 113 may be connected to the first shell wall 2111 of the battery cell 2, or it may only be in contact with the first barrier without being connected.

[0162] Optionally, the first barrier 113 may be connected to the support structure 4, or it may only be in contact with the support structure without being connected.

[0163] Optionally, the first barrier 113 may be connected to the first wall 111 of the battery box 1, or it may only be in contact with the first wall 111 of the battery box 1 without being connected.

[0164] For example, the surface of the first barrier 113 facing the first box wall 111 is connected to the first box wall 111, and the surface of the first barrier 113 facing away from the first box wall 111 is in contact with the support structure 4 and the outer surfaces of the first shell walls 2111 on both sides of the support structure 4, but is not connected.

[0165] For example, the battery box 1 includes a box body 11 and a box cover 12. The box cover 12 is fastened to the box body 11 along a first direction X, forming a closed space 10 between them. The box body 11 includes a first box wall 111.

[0166] Thus, by arranging the battery cells 2 with their first shell wall 2111 facing the first housing wall 111, and with the pressure relief mechanism 23 of each battery cell 2 facing at least one vent 1111 of the first housing wall 111, the emissions from the battery cells 2 discharged through the pressure relief mechanism 23 can be quickly discharged outward through the vent 1111 opposite to the pressure relief mechanism 23, improving the pressure relief efficiency. Furthermore, the first barrier 113 ensures that the emissions from each battery cell 2 are discharged outward through the vent 1111 corresponding to its respective pressure relief mechanism 23, preventing them from easily escaping into the exhaust space between the first shell wall 2111 and the first housing wall 111 of adjacent battery cells 2. This helps reduce the impact on other battery cells 2, suppresses the spread and aggravation of thermal runaway, and thus reduces the risk of fire in the battery device 100.

[0167] In some embodiments, such as Figure 10 As shown, the first barrier 113 is elastic and is elastically compressed between the first box wall 111 and the support structure 4.

[0168] For example, the first barrier 113 may be, but is not limited to, foam. Examples include silicone rubber foam, EPDM rubber foam, neoprene rubber foam, nitrile rubber foam, natural rubber foam, polyethylene foam, polypropylene foam, polystyrene foam, etc.

[0169] Thus, by elastically compressing the first barrier 113 between the first housing wall 111 and the support structure 4, the first barrier 113 and the first housing wall 111 and the support structure 4 on both sides have elastic forces, which improves the tightness of the fit between the first barrier 113, the first housing wall 111 and the support structure 4, thereby better blocking the emissions and further reducing the possibility of emissions escaping into the exhaust space between the adjacent battery cell 2 and the first housing wall 111. This helps to reduce the impact on other battery cells 2, suppress the spread and aggravation of thermal runaway, and thus reduce the risk of fire in the battery device 100.

[0170] Of course, it is understood that the first barrier 113 is not limited to being elastic. In some embodiments, the first barrier 113 may be a structural member with high rigidity and no elasticity.

[0171] In some embodiments, the battery box 1 further includes a sealing member 114, and the vent 1111 is closed by the sealing member 114. When the pressure or temperature on the sealing member 114 reaches a predetermined threshold, the vent 1111 opens.

[0172] For example, at least a portion of the vent holes 1111 are arranged at intervals along the second direction Y, and the plurality of vent holes 1111 arranged along the second direction Y are closed by the same sealing member 114.

[0173] For example, at least a portion of the vent holes 1111 are arranged at Z intervals along a third direction.

[0174] For example, multiple battery cells 2 within the enclosed space 10 are arranged in an array in the second direction Y and the third direction Z, and multiple vent holes 1111 arranged along the second direction Y are sealed by the same sealing member 114.

[0175] Optionally, the vent 1111 corresponds one-to-one with the sealing element 114, and the vent 1111 is closed by its corresponding sealing element 114.

[0176] Thus, by providing the sealing component 114, when the battery device 100 is in normal condition, dust particles outside the battery box 1 are less likely to enter the enclosed space 10 of the battery box 1 through the vent 1111, reducing the impact on the battery cells 2 and electrical connectors inside the battery box 1 and improving the reliability of the battery device 100. In the event of thermal runaway of some battery cells 2, the sealing component 114 partially ruptures the vent 1111 corresponding to these battery cells 2, allowing these vent 1111 to open and discharge the emissions from the battery cells 2 through the vent 1111.

[0177] In some embodiments, at least a portion of the vent holes 1111 arranged along the second direction Y are closed by the same sealing member 114, and the first barrier member 113 is bonded to the surface of the sealing member 114 facing the enclosed space 10.

[0178] For example, the first housing wall 111 forms a connecting rib 1112 between two adjacent vent holes 1111 along the second direction Y, a portion of the sealing member 114 covers the side of the connecting rib 1112 facing the battery cell 2, and the first barrier member 113 is bonded to the portion of the sealing member 114 covering the connecting rib 1112.

[0179] For example, the sealing element 114 is connected to the first box wall 111 by adhesive, snap-fit ​​or fastener connection.

[0180] This helps reduce the number of parts, improves assembly efficiency, and also enhances structural strength.

[0181] In some embodiments, the sealing member 114 has a recess 1142 formed on the surface facing the battery cell 2. The recess 1142 is disposed opposite to the pressure relief mechanism 23 along the first direction X. Multiple recesses 1142 are arranged at intervals along the second direction Y. The first barrier member 113 is bonded to the surface of the sealing member 114 located between adjacent recesses 1142.

[0182] For example, the sealing member 114 has a protrusion 1141 corresponding to the recess 1142 formed on the surface facing away from the battery cell 2. The sealing member 114 seals the vent 1111 from the side of the first casing wall 111 facing the battery cell 2, and the protrusion 1141 extends into the vent 1111. In this way, the wall thickness of the sealing member 114 can be relatively small at various points.

[0183] Understandably, the recess 1142 is formed on the surface of the sealing member 114 facing the battery cell 2. Along the first direction X, the distance between the surface of the recess 1142 and the battery cell 2 is greater than the distance between the other parts of the sealing member 114 facing the battery cell 2 (excluding the recess 1142) and the battery cell 2. The protrusion 1141 is formed on the surface of the sealing member 114 facing away from the battery cell 2. Along the first direction X, the distance between the surface of the protrusion 1141 and the battery cell 2 is greater than the distance between the other parts of the sealing member 114 facing away from the battery cell 2 (excluding the protrusion 1141) and the battery cell 2.

[0184] Thus, by forming the recessed portion 1142, a gap is formed between the sealing member 114 and the pressure relief mechanism 23 along the first direction X, reducing the possibility that the setting of the sealing member 114 will affect the normal opening of the pressure relief mechanism 23, thereby enabling the battery cell 2 to release gas smoothly.

[0185] In some embodiments, the battery device 100 further includes a second barrier 115, the edge of the sealing member 114 facing the surface of the battery cell 2 is connected to the second barrier 115, the second barrier 115 is in contact with the first shell wall 2111 of the battery cell 2, the first barrier 113 extends along the third direction Z, and both ends of the first barrier 113 are in contact with the second barrier 115, the third direction Z intersects the first direction X and the second direction Y and is not coplanar.

[0186] For example, the sealing member 114 has a rectangular structure, and the length direction of the sealing member 114 is consistent with the second direction Y. The sealing member 114 has a plurality of recesses 1142 arranged at intervals along the second direction Y. The four edges of the sealing member 114 facing the battery cell 2 are all connected to the second barrier member 115. The first barrier member 113 extends along the third direction Z, and both ends of it are in contact with the second barrier member 115, so that two adjacent first barrier members 113 and second barrier members 115 form a square frame structure. The square frame structure abuts against the four edges of the outer surface of the first shell wall 2111.

[0187] For example, the second barrier 115 may be, but is not limited to, foam. Examples include silicone rubber foam, EPDM rubber foam, neoprene rubber foam, nitrile rubber foam, natural rubber foam, polyethylene foam, polypropylene foam, polystyrene foam, etc.

[0188] Thus, the second barrier 115 and the first barrier 113 cooperate to form a barrier structure around the pressure relief mechanism 23, which is used to prevent the emissions discharged from the pressure relief mechanism 23 from escaping to the surroundings, so that the emissions can break through the sealing member 114 and be discharged through the exhaust hole 1111, thereby realizing the directional exhaust of the emissions and improving the exhaust efficiency.

[0189] In some embodiments, the second barrier 115 is elastic and is elastically compressed between the sealing member 114 and the outer surface of the first shell wall 2111.

[0190] Thus, by elastically compressing the second barrier 115 between the sealing member 114 and the outer surface of the first shell wall 2111, the second barrier 115 and the sealing members 114 on both sides and the first shell wall 2111 all have elastic forces, which improves the tightness of the fit between the second barrier 115, the sealing member 114 and the first shell wall 2111, thereby better blocking the emission, further reducing the possibility of the emission spreading to the surroundings, which is conducive to reducing the impact on other battery cells 2, and to suppressing the spread and aggravation of thermal runaway, thereby reducing the risk of fire in the battery device 100.

[0191] Of course, it is understood that the second barrier 115 is not limited to being elastic. In some embodiments, the second barrier 115 may be a structural member with high rigidity and no elasticity.

[0192] In some embodiments, such as Figure 9 and Figure 10 As shown, the first box wall 111 is located below the battery cell 2.

[0193] It should be noted that "below" can refer to directly below along the direction of gravity, or diagonally below.

[0194] It is understandable that "the first box wall 111 is located below the battery cell 2" means that when the battery device 100 is in operation, the position of the first box wall 111 is lower than that of the battery cell 2, and supports the battery cell 2 from below.

[0195] This allows emissions to be discharged downwards through the vent 1111, reducing the impact on electrical components above the battery cell 2 and improving the operational reliability of the battery device 100.

[0196] In some embodiments, such as Figure 9 and Figure 10 As shown, the battery box 1 also includes a protective plate 112. The protective plate 112 is located on the side of the first box wall 111 facing away from the enclosed space 10 along the first direction X, and forms a pressure relief cavity 20 between the protective plate 112 and the first box wall 111. The protective plate 112 has a vent hole 1121, and the pressure relief cavity 20 communicates with the space outside the box through the vent hole 1121.

[0197] For example, the guard plate 112 has one or more vent holes 1121.

[0198] For example, the pressure relief cavity 20 formed between the protective plate 112 and the first box wall 111 can be configured as a single-layer cavity, or a partition plate can be provided between the protective plate 112 and the first box wall 111 to form a double-layer cavity, or a triple-layer cavity, etc.

[0199] Thus, by forming the pressure relief chamber 20, the emissions from multiple battery cells 2 can be collected in the pressure relief chamber 20 and then discharged through the vent hole 1121. This helps to extend the emission path of the emissions, reduce the temperature of the emissions discharged through the vent hole 1121, and lower the risk of emissions ignition.

[0200] In some embodiments, the electrode assembly 22 includes a positive electrode sheet, which includes a positive active material, and the positive active material is lithium nickel cobalt manganese oxide.

[0201] For example, the positive electrode sheet may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0202] For example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector. As an example, the negative active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0203] The battery cell 2 is a ternary lithium battery. Ternary lithium batteries produce a large amount of gas, and the outer casing 21 is more prone to deformation. Therefore, by setting the support structure 4, the deformation of the outer casing 21 can be effectively suppressed, reducing the probability of the outer casing 21 of the ternary lithium battery breaking. This can suppress the aggravation of thermal runaway and reduce the risk of fire in the battery device 100.

[0204] The second aspect of this application provides an electrical appliance, such as Figure 1 As shown, the electrical equipment includes an electrical device 200a and a battery device 100 provided in the first aspect, the battery device 100 being used to supply power to the electrical device 200a.

[0205] Because the electrical device includes a battery device 100, and because the electrical device includes all the beneficial effects of the battery device 100, the electrical device is able to reduce the risk of fire in the event of thermal runaway.

[0206] In some embodiments, such as Figure 1As shown, the electrical equipment includes an aircraft 1000, which includes a battery device 100 and a fuselage 200 as an electrical device 200a. The fuselage 200 has a battery compartment in which the battery device 100 is installed.

[0207] Aircraft 1000 generally refers to a device that flies within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, it can be a low-altitude aircraft 1000, an eVTOL (electric vertical take-off and landing) aircraft 1000, a commuter aircraft, a regional jet, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. For example, aircraft 1000 is a cargo drone.

[0208] Therefore, the risk of the aircraft 1000 catching fire in the event of thermal runaway is low.

[0209] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0210] As a specific example, a battery pack (battery device 100) is provided, including a battery module and a battery box 1. The battery module includes a battery cell (battery cell 2), a harmonica tube water-cooled plate (heat exchange component 3), a silicone rubber foam for insulation (blocking component 5), and structural adhesive (support structure 4). The battery box 1 includes a box bottom plate (first box wall 111) and protective silicone rubber foam (first barrier component 113).

[0211] A harmonica tube water-cooling plate is attached to the large surface (second shell wall 2112) of the battery cell (one of two adjacent battery cells 2) and the other battery cell (the other of two adjacent battery cells 2). A bottom assembly gap (first gap) is left between the bottom of the harmonica tube water-cooling plate and the bottom of the battery cell. In the bottom assembly gap, a silicone rubber foam is provided. The thickness of the silicone rubber foam is greater than the width of the bottom assembly gap to form an interference fit. A 2mm-3mm adhesive application height is left between the silicone rubber foam and the bottom of the battery cell. Structural adhesive (support structure 4) is set in this space. The structural adhesive bonds the bottom welds (welds 213) of the two adjacent battery cells. After the structural adhesive is applied, the bottom is flush with the bottom of the battery cell.

[0212] The bottom of the lower casing (casing 11) of the battery pack corresponds to the module installation area (enclosed space 10) as the casing bottom plate (first casing wall 111). An explosion-proof valve clearance hole (vent hole 1111) is provided on the casing bottom plate corresponding to the cell explosion-proof valve (pressure relief mechanism 23). Reinforcing ribs (connecting ribs 1112) are provided between the explosion-proof valve clearance holes, and the positions of the reinforcing ribs (connecting ribs 1112) correspond to the positions of the harmonica tube water-cooling plate. A polycarbonate seal (sealant 114) is provided in the explosion-proof valve clearance hole formed on the casing bottom plate. A clearance groove (recess 1142) is provided on the polycarbonate seal corresponding to the cell explosion-proof valve. Protective silicone rubber foam (first barrier 113) is adhered to the reinforcing ribs (connecting ribs 1112) of the casing bottom plate (first casing wall 111) corresponding to the polycarbonate seal (sealant 114).

[0213] After the battery modules are assembled into the battery box 1, a gap for applying adhesive is left between the bottom of the battery cell (first shell wall 2111) and the bottom plate of the box (first box wall 111). The reinforcing ribs (connecting ribs 1112) of the bottom plate of the box (first box wall 111) and the outer surfaces of the bottom of the battery cells (first shell wall 2111) of two adjacent battery cells are interference-fitted by protective silicone rubber foam (first barrier 113). When a battery cell experiences thermal runaway, due to the effect of the structural adhesive, the other two adjacent battery cells located on opposite sides of the battery cell are bonded to the battery cell by the structural adhesive, reducing the probability of deformation and cracking of the bottom weld (weld 213) of the battery cell. Furthermore, the setting of the protective silicone rubber foam (first barrier 113) reduces the leakage of thermal runaway fumes from the bottom adhesive gap, thereby protecting the adjacent normal battery cells.

[0214] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery device, characterized in that, include: Multiple battery cells, each battery cell including a housing, a pressure relief mechanism and at least one electrode assembly, the housing having a receiving cavity and including a first housing wall, the wall thickness direction of the first housing wall being a first direction, the pressure relief mechanism being disposed on the first housing wall, the electrode assembly being received within the receiving cavity, and at least a portion of the battery cells being arranged along a second direction, the second direction intersecting the first direction; A heat exchanger is disposed between adjacent battery cells along the second direction, and a first gap is formed between the mutually facing surfaces of the adjacent battery cells and the end face of the heat exchanger that is close to the first shell wall along the first direction. A support structure is provided within the first gap and is connected to the shell walls of the battery cells on both sides facing the first gap.

2. The battery device according to claim 1, characterized in that, The housing has a weld, and a portion of the weld is located on the surface of the housing facing the first gap. The support structure covers the weld and is connected to the surfaces of the housing facing the first gap and located on opposite sides of the weld.

3. The battery device according to claim 1, characterized in that, The support structure is bonded to the surfaces of the battery cells on both sides facing the first gap.

4. The battery device according to claim 3, characterized in that, The support structure is made of adhesive.

5. The battery device according to claim 3, characterized in that, The battery device also includes a blocking member that blocks the space between the support structure and the heat exchanger.

6. The battery device according to claim 5, characterized in that, The blocking member is elastic and is elastically compressed between the outer shells on both sides.

7. The battery device according to claim 6, characterized in that, At least one of the two opposing surfaces of the blocking member along the second direction is bonded to the battery cell.

8. The battery device according to any one of claims 1 to 7, characterized in that, The surface of the support structure facing away from the heat exchanger along the first direction is flush with the outer surfaces of the first shell walls on both sides.

9. The battery device according to any one of claims 1 to 7, characterized in that, The dimension of the support structure along the first direction is greater than or equal to 2 mm and less than or equal to 3 mm.

10. The battery device according to any one of claims 1 to 7, characterized in that, The battery device further includes a battery case having an enclosed space. The individual battery cells are located within the enclosed space. The walls of the battery case enclosing the enclosed space include a first wall that supports the individual battery cells from one side in the first direction. The individual battery cells are arranged with their first casing facing the first wall. The first wall has multiple vent holes. Each individual battery cell's pressure relief mechanism has at least one vent hole positioned opposite to it along the first direction. The battery box further includes a first barrier. Each of the supporting structures has at least one first barrier on the side facing away from the heat exchanger. The first barrier is in contact with the surface of the first box wall facing the enclosed space and with the supporting structure, and / or with a portion of the outer surface of the two first shell walls adjacent in the second direction. The first barrier avoids the pressure relief mechanism and the exhaust port.

11. The battery device according to claim 10, characterized in that, The first barrier is elastic and is elastically compressed between the first box wall and the supporting structure.

12. The battery device according to claim 10, characterized in that, The battery box also includes a sealing element, the vent is closed by the sealing element, and the vent opens when the pressure or temperature on the sealing element reaches a predetermined threshold.

13. The battery device according to claim 12, characterized in that, At least a portion of the vents arranged along the second direction are closed by the same sealing member, and the first barrier is bonded to the surface of the sealing member facing the enclosed space.

14. The battery device according to claim 13, characterized in that, The sealing member has a recessed portion formed on the surface facing the battery cell. The recessed portion is disposed opposite to the pressure relief mechanism along the first direction. Multiple recessed portions are arranged at intervals along the second direction. The first barrier member is bonded to the surface of the sealing member located between adjacent recessed portions.

15. The battery device according to claim 13, characterized in that, The battery device further includes a second barrier, the edge of the sealing member facing the battery cell being connected to the second barrier, and the second barrier contacting the first shell wall of the battery cell. The first barrier extends along a third direction, and both ends of it are in contact with the second barrier. The third direction intersects and is not coplanar with both the first and second directions.

16. The battery device according to claim 15, characterized in that, The second barrier is elastic and is elastically compressed between the sealing member and the outer surface of the first shell wall.

17. The battery device according to claim 10, characterized in that, The first box wall is located below the battery cell.

18. The battery device according to claim 10, characterized in that, The battery box also includes a protective plate, which is located on the side of the first box wall facing away from the enclosed space along the first direction, and forms a pressure relief cavity between the protective plate and the first box wall. The protective plate forms a vent hole, and the pressure relief cavity communicates with the external space through the vent hole.

19. The battery device according to any one of claims 1 to 7, characterized in that, The electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive active material, and the positive active material is lithium nickel cobalt manganese oxide.

20. An electrical appliance, characterized in that, include: Electrical appliances; The battery device according to any one of claims 1 to 19 is used to supply power to the electrical device.

21. The electrical equipment according to claim 20, characterized in that, The electrical equipment includes an aircraft, which includes the battery device and a body serving as the electrical equipment. The body has a battery compartment in which the battery device is installed.

Images