Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body assembly and a battery monomer assembly. The box body assembly comprises a box body and a plate body structure. A first containing cavity is formed in the box body, and the battery monomer assembly is arranged in the first containing cavity. The plate body structure is arranged on the side, away from the first containing cavity, of the box body and comprises a first plate body, and the first plate body comprises multiple layers of fiber woven cloth and a resin matrix which are arranged in a stacked mode. The first plate body comprises a protruding part and a main body part, the protruding part protrudes out of the main body part in the wall thickness direction of the main body part, and the wall thickness of at least part of the protruding part is larger than that of the main body part. The battery device provided by the embodiment of the utility model is beneficial to reducing the weight of the first plate body and improving the structural strength of the first plate body, thereby being beneficial to improving the energy density and the structural strength of the battery device, being beneficial to forming the convex part and being beneficial to improving the thermal protection performance of the box body assembly.

Description

Technical Field

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

[0002] Batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are increasingly being used in the field of energy storage.

[0003] In battery-powered electrical devices, the battery can provide all or part of the power. Therefore, improving the energy density of battery devices while enhancing their structural strength has become an important research direction in this field. Utility Model Content

[0004] In view of this, the embodiments of this application aim to provide a battery device and an electrical device that improve the energy density of the battery device while increasing structural strength.

[0005] Therefore, a first aspect of the present application provides a battery device, the battery device including a housing assembly and a battery cell assembly, the housing assembly including:

[0006] The box body has a first receiving cavity inside, and the battery cell assembly is disposed in the first receiving cavity;

[0007] The box body has a first receiving cavity inside, and the battery cell assembly is disposed in the first receiving cavity;

[0008] A plate structure is provided on the side of the box body opposite to the first receiving cavity. The plate structure includes a first plate, which comprises multiple layers of woven fiber fabric and a resin matrix stacked together.

[0009] The first plate includes a protrusion and a main body. Along the wall thickness direction of the main body, the protrusion protrudes from the main body, and at least a portion of the wall thickness of the protrusion is greater than the wall thickness of the main body.

[0010] The battery device provided in this disclosure includes a housing assembly and a battery cell assembly. The housing assembly includes a housing body and a plate structure. The housing body has a first receiving cavity, in which the battery cell assembly is disposed, and the housing body protects the battery cell assembly. Along the wall thickness direction of the main body, protrusions are provided protruding from the main body. This reduces the gap between the first plate and the housing body, increases fluid flow rate, and thus improves cooling and exhaust efficiency. It also allows for the timely discharge of high-temperature fluid generated by thermal runaway of the battery cell, reducing the impact on other battery cells and mitigating the chain reaction of thermal runaway. Furthermore, it improves the structural strength of the first plate. In addition, by configuring the first plate as comprising multiple layers of woven fiber fabric and a resin matrix, the woven fiber fabric is lightweight and has high strength, thus reducing the weight of the first plate and improving its structural strength, thereby increasing the energy density and structural strength of the battery device. Furthermore, the woven fiber fabric has a high fiber curvature during weaving, making the protrusions of the first plate easier to form. In addition, the tightly woven fiber fabric has high mechanical strength, and the fibers are not easily dispersed after thermal runaway of the battery cell, which helps to improve the thermal protection performance of the enclosure components.

[0011] In some embodiments, the number of layers of woven fabric located on the protrusion is greater than the number of layers of woven fabric located on the main body.

[0012] In other words, the wall thickness of the main body is less than the wall thickness of the protrusion.

[0013] In some embodiments, the first plate protrudes from the first receiving cavity to form the protrusion.

[0014] This helps to reduce the gap between the first plate and the box body, increase the fluid flow rate, and thus improve the exhaust efficiency.

[0015] In some embodiments, the first plate includes a large surface area and a connecting area. Projected along the thickness direction of the first plate, the projection of the battery cell is located in the large surface area. The protrusion includes a first protrusion disposed in the large surface area.

[0016] By setting the first protrusion to protrude from the main body, it is beneficial to reduce the gap between the first plate and the main body, increase the fluid flow rate, thereby improving the cooling efficiency and exhaust efficiency. It also allows the high-temperature fluid generated by the thermal runaway of the battery cell to be discharged in time, which helps to reduce the impact on other battery cells and thus reduce the chain reaction of thermal runaway of the battery cell. In addition, it also helps to improve the structural strength of the first plate.

[0017] In some embodiments, the first plate includes a main woven fabric layer and an overlapping woven fabric layer stacked together. The main woven fabric layer forms the main body portion and the protrusion portion. The main woven fabric layer located at the first protrusion portion has a slit. The overlapping woven fabric layer is located at the first protrusion portion and covers the slit.

[0018] By making a cut in the main woven fabric layer of the first protrusion and overlapping the woven fabric layer with the main woven fabric layer of the first protrusion to cover the cut, the main woven fabric layer and the overlapping woven fabric layer can be flatly attached to the first protrusion, and the overlapping woven fabric layer can also reinforce the first protrusion.

[0019] In some embodiments, the cut includes a first sub-cut and at least one second sub-cut, the first sub-cut extending along the extending direction of the first protrusion, one end of the second sub-cut being connected to the first sub-cut, and the other end extending toward the corner of the first protrusion.

[0020] In this embodiment, by setting the cut to include a first cut and at least one second cut, and connecting one end of the second cut to the first cut, and extending the other end toward the corner of the first protrusion, it is beneficial to make the main woven fabric layer flatly covered at the first protrusion.

[0021] In some embodiments, the wall thickness of the main body is 0.5mm-1.2mm, and / or the maximum wall thickness of the protrusion is 1mm-2.4mm.

[0022] By setting the wall thickness of the main body to 0.5mm-1.2mm, which is an appropriate range, the first plate can have sufficient structural strength and impact resistance, while minimizing the space and weight occupied by the first plate, thereby improving the energy density of the battery device.

[0023] By setting the maximum wall thickness of the protrusion to 1mm-2.4mm, an appropriate wall thickness within this range can ensure that the protrusion has sufficient structural strength and impact resistance, as well as ease of molding, while minimizing the space and weight occupied by the protrusion, thereby improving the energy density of the battery device.

[0024] In some embodiments, the ratio of the number of layers of the woven fabric in the main body to the number of layers of the woven fabric in the protrusion is 2:3-1:2.

[0025] In this embodiment, the ratio of the number of fiber woven fabric layers in the main body to the number of fiber woven fabric layers in the protrusion is 2:3 to 1:2. That is, by relatively increasing the number of fiber woven fabric layers in the protrusion, the protrusion has sufficient structural strength and impact resistance, and is easy to form. In addition, by relatively reducing the number of fiber woven fabric layers in the main body, the space occupied and weight of the main body can be reduced as much as possible, thereby improving the energy density of the battery device.

[0026] In some embodiments, the height of the protrusion is 1mm-8mm.

[0027] While ensuring that the first plate has sufficient structural strength and impact resistance, it also allows for a certain gap between the protrusion and the main body of the box, which helps to improve cooling efficiency and exhaust efficiency.

[0028] In some embodiments, the gap between the protrusion and the box body is 3mm-18mm.

[0029] This helps to reduce the gap between the protrusion and the housing body, increase the fluid flow rate, and ensure that the fluid has a certain flow rate between the protrusion and the housing body, thereby improving cooling efficiency and exhaust efficiency.

[0030] In some embodiments, the first plate includes a large surface area and a connecting area. Projected along the thickness direction of the first plate, the projection of the battery cell is located in the large surface area. The protrusion includes a second protrusion. The connecting area is connected to the housing body, and the second protrusion is disposed in the connecting area.

[0031] The protrusion is designed with a second protrusion to give the connection area sufficient structural strength, thereby improving the reliability of the connection structure between the connection area and the box body.

[0032] In some embodiments, the large surface area has a groove, which, together with the box body, forms a second receiving cavity, and the connecting area is disposed around the large surface area for connecting with the box body.

[0033] In some embodiments, the housing assembly includes an adhesive layer, and the connection area is sealed to the housing body through the adhesive layer.

[0034] This connection structure is simple, improving assembly efficiency while reducing costs. Furthermore, it enhances the seal between the first plate and the main body of the housing.

[0035] In some embodiments, the second protrusion is provided with a locking hole, and the connecting area is connected to the box body through the locking hole.

[0036] By providing a locking hole in the second protrusion, the area where the locking hole is located is thickened to improve the structural strength of the locking hole area, thereby improving the reliability of the connection structure between the connection area and the box body.

[0037] In some embodiments, the minimum distance between the wall of the locking hole and the outer contour of the first plate is 4mm-10mm.

[0038] This helps to further improve the reliability of the connection structure between the connection area and the box body, and can also minimize the space and weight occupied by the second protrusion to improve the energy density of the battery device.

[0039] In some embodiments, the second protrusion includes a first portion and a second portion connected together, the second portion protruding relative to the first portion toward the side closer to the housing body, and the second portion having the locking hole.

[0040] In this embodiment, the second part protrudes towards the side closer to the box body relative to the first part, which helps to reduce the space occupied by the fasteners and facilitates the connection between the first plate and the box body.

[0041] In some embodiments, the connecting area is rectangular, and the locking hole is provided at each corner of the connecting area.

[0042] While improving the reliability of the connection between the first plate and the box body, reducing the number of locking holes helps to reduce costs and improve assembly efficiency.

[0043] In some embodiments, the plate structure includes at least one partition, which is disposed between the box body and the first plate and abuts against the box body and the first plate to form a pressure relief chamber and an air-cooling channel;

[0044] The separator is configured to break in the event of thermal runaway of the battery cell, thereby connecting the pressure relief chamber with the air-cooling channel.

[0045] In this embodiment, by setting a separator to form a pressure relief chamber and an air-cooling channel, the battery device can cool the battery cells through the second receiving chamber under normal use, and can relieve pressure through the air-cooling channel outside the second receiving chamber when the battery cells are thermally runaway.

[0046] In some embodiments, the separator extends along a first direction, and the separator and at least a portion of the protrusion are alternately arranged along a second direction, the first direction intersecting the second direction.

[0047] In this embodiment, by alternately arranging the partition and the protrusion along the second direction, an air-cooling flow channel is formed between the protrusion and the housing body, thereby achieving an orderly arrangement of the pressure relief chamber and the air-cooling flow channel, which helps to reduce turbulence and improve cooling efficiency and exhaust efficiency.

[0048] In some embodiments, the partition includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall connected in sequence. The first sidewall and the third sidewall are disposed opposite each other along a first direction, and the second sidewall and the fourth sidewall are disposed opposite each other along a second direction. The first sidewall, the second sidewall, the third sidewall, and the fourth sidewall form the intermediate cavity wall of the pressure relief chamber located between the box body and the first plate. The first direction and the second direction are perpendicular to the thickness direction of the first plate.

[0049] It is possible that two of the side walls are connected to the box body, and the other two side walls are separate from the box body; it is also possible that three of the side walls are connected to the box body, and the other side wall is separate from the box body; or it is also possible that one side wall is connected to the box body, and the other three side walls are separate from the box body.

[0050] In some embodiments, the wall thickness of at least one of the first sidewall and the third sidewall is less than the wall thickness of the second sidewall and the fourth sidewall.

[0051] In this embodiment, by setting the wall thickness of at least one of the first and third sidewalls to be less than that of the second and fourth sidewalls, the high-temperature fluid generated by the thermal runaway of the battery cell can preferentially flow out from the part with the smaller wall thickness, thereby improving the pressure relief efficiency and pressure relief reliability.

[0052] In some embodiments, the housing body includes a first wall, and the battery cell assembly is supported on the first wall; the first plate is disposed on the side of the first wall opposite to the first receiving cavity, and a wind-cooled chamber is formed between the plate structure and the first wall, and the plate structure is provided with a first air outlet and a second air outlet communicating with the wind-cooled chamber.

[0053] The technical solution of this application embodiment provides an air-cooled chamber. The heat exchange medium flowing in the air-cooled chamber can enter the air-cooled chamber through one of the first air inlet and the second air inlet, and exit the air-cooled chamber through the other of the first air inlet and the second air inlet. The heat exchange medium in the air-cooled chamber exchanges heat with the first wall, thereby realizing the heat exchange between the battery cells in the housing assembly and the outside, so as to maintain the battery cells at a suitable temperature.

[0054] In some embodiments, the plate structure further includes a flow collector, the first plate having a first air outlet and a second air outlet, the flow collector being disposed between the first plate and the first wall, and forming a flow collection cavity with the first plate, the flow collector having a sub-flow outlet, the sub-flow outlet connecting the air-cooled chamber and the flow collection cavity.

[0055] The technical solution of this application embodiment, by setting up a flow collector, forms a flow collecting cavity, which connects to the first air outlet and the second air outlet, facilitating the inflow or outflow of the heat exchange medium and reducing turbulence. The sub-outlets of the flow collector can distribute the heat exchange medium, so as to distribute different flow rates of heat exchange medium to different positions in the air-cooled chamber, thereby improving the utilization rate of the heat exchange medium and facilitating the temperature equalization of the battery device.

[0056] In some embodiments, at least one of the current collector and the first plate includes a boss structure that forms the current collection cavity, and the sub-flow outlet is disposed on the boss structure.

[0057] In this embodiment, the current collector includes a boss structure, which protrudes in a direction away from the first plate to form the boss structure. In other words, the boss structure protrudes away from the first plate and forms a current collecting cavity between itself and the first plate.

[0058] In some embodiments, the woven fabric includes one or more combinations of plain weave, twill weave, and satin weave.

[0059] In some embodiments, the woven fabric includes one or more of glass fiber woven fabric, carbon fiber woven fabric, aramid fiber woven fabric, and basalt fiber woven fabric; and / or, the resin matrix includes one or more of epoxy resin, polyurethane resin, vinyl ester resin, polypropylene resin, and polyamide resin.

[0060] A second aspect of this application provides an electrical device, including the battery device or the energy storage device described above.

[0061] In some embodiments, the electrical device includes an aircraft. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application;

[0063] Figure 2 This is an exploded perspective view of a battery device provided in some embodiments of the present disclosure;

[0064] Figure 3 A partial structural schematic diagram of the housing assembly provided in some embodiments of this disclosure;

[0065] Figure 4 for Figure 3 A sectional view;

[0066] Figure 5 for Figure 4 A sectional view of the enlarged view at point A in the middle;

[0067] Figure 6 This is a schematic diagram of the plate structure provided in some embodiments of this disclosure;

[0068] Figure 7 This is a schematic diagram of the plate structure provided in some embodiments of this disclosure;

[0069] Figure 8 for Figure 7 Cross-sectional view along the BB direction;

[0070] Figure 9 for Figure 7 A cross-sectional view along the CC direction;

[0071] Figure 10 A schematic diagram of the structure of the slit of the protrusion provided in some embodiments of this disclosure;

[0072] Figure 11 This is a schematic diagram of the plate structure provided in some embodiments of this disclosure.

[0073] Explanation of reference numerals in the attached figures

[0074] 10. Battery cell; 20. Housing assembly; 21. Housing body; 211. First housing section; 212. Second housing section; 213. First wall; 22. Plate structure; 221. First plate; 2211. Protrusion; 22111. First protrusion; 22112. Second protrusion; 2212. Slit; 22121. First slot; 22122. Second slot; 2214. Connection area; 2215. Large surface area; 2217. First part; 2218. Second part; 2219. Locking hole ; 222, Separator; 2221, First sidewall; 2222, Second sidewall; 2223, Third sidewall; 2224, Fourth sidewall; 223, Current collector; 2231, First current collector; 2232, Second current collector; 2233, Sub-flow outlet; 2234, Boss structure; 23, First receiving cavity; 24, Second receiving cavity; 241, First air vent; 242, Second air vent; 25, Pressure relief area; 26, Air-cooled flow channel; 27, Pressure relief cavity; 100, Battery assembly; 200, Cabin shell. Detailed Implementation

[0075] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0076] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0077] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0078] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0079] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0080] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0081] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0082] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0083] In some implementations, the electrode assembly is a stacked structure.

[0084] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0085] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0086] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0087] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0088] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0089] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0090] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0091] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0092] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This disclosure does not impose any particular limitations.

[0093] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0094] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0095] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0096] In related technologies, the bottom protective plate is a metal structure, which results in significant weight and complex structure. Therefore, how to improve the energy density of the battery device while enhancing structural strength has become an important research direction in this field.

[0097] In view of this, in order to improve the energy density of the battery device while increasing structural strength, embodiments of this disclosure provide a battery device including a housing assembly and a battery cell assembly. The housing assembly includes a housing body and a plate structure. The housing body has a first receiving cavity inside, and the battery cell assembly is disposed in the first receiving cavity. The plate structure is disposed on the side of the housing body opposite to the first receiving cavity, and the plate structure includes a first plate, which includes multiple layers of woven fiber fabric and a resin matrix stacked together. The first plate includes a protrusion and a main body, and the protrusion protrudes from the main body along the wall thickness direction of the main body, with at least a portion of the protrusion having a wall thickness greater than that of the main body.

[0098] The battery device provided in this disclosure includes a housing assembly and a battery cell assembly. The housing assembly includes a housing body and a plate structure. The housing body has a first receiving cavity, in which the battery cell assembly is disposed, and the housing body protects the battery cell assembly. Along the wall thickness direction of the main body, protrusions are provided protruding from the main body. This reduces the gap between the first plate and the housing body, increases fluid flow rate, and thus improves cooling and exhaust efficiency. It also allows for the timely discharge of high-temperature fluid generated by thermal runaway of the battery cell, reducing the impact on other battery cells and mitigating the chain reaction of thermal runaway. Furthermore, it improves the structural strength of the first plate. In addition, by configuring the first plate as comprising multiple layers of woven fiber fabric and a resin matrix, the woven fiber fabric is lightweight and has high strength, thus reducing the weight of the first plate and improving its structural strength, thereby increasing the energy density and structural strength of the battery device. Furthermore, the woven fiber fabric has a high fiber curvature during weaving, making the protrusions of the first plate easier to form. In addition, the tightly woven fiber fabric has high mechanical strength, and the fibers are not easily dispersed after thermal runaway of the battery cell, which helps to improve the thermal protection performance of the enclosure components.

[0099] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical devices include battery devices according to any embodiment of this disclosure, and the battery devices are used to provide electrical energy.

[0100] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This disclosure does not impose any special limitations on the above-mentioned electrical equipment.

[0101] It should be noted that the technical solutions described in this disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices.

[0102] The vehicle's interior can house a controller, a motor, and a battery pack. The controller controls the battery pack to power the motor. For example, the battery pack can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, it can serve as the vehicle's operating power source for the vehicle's electrical system, such as for the power needs of starting, navigation, and operation. In another embodiment of this disclosure, the battery pack can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0103] For example, please refer to Figure 1 Electrical equipment includes aircraft.

[0104] Aircraft generally refer to machines that fly within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0105] Reference Figure 1 An aircraft typically includes an airframe (including a cabin shell 200) and a battery device 100 (including a housing assembly 20) disposed on the airframe and providing electrical power to the airframe.

[0106] Please see Figure 2To meet different power demands, the battery includes battery cell modules, which can include multiple battery cells 10. A battery cell 10 is the smallest unit that makes up a battery module or battery pack. Multiple battery cells 10 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel connections. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of multiple battery cells 10 is housed within a housing assembly 20. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing assembly 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 10. Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0107] Please see Figures 2 to 8 This disclosure provides a battery device 100, which includes a housing assembly 20 and a battery cell assembly. The housing assembly 20 includes a housing body 21 and a plate structure 22. The housing body 21 has a first receiving cavity 23 inside, and the battery cell assembly is disposed in the first receiving cavity 23. The plate structure 22 is disposed on the side of the housing body 21 opposite to the first receiving cavity 23. The plate structure 22 includes a first plate 221, which includes multiple layers of woven fiber fabric and a resin matrix stacked together. The first plate 221 includes a protrusion 2211 and a main body. Along the wall thickness direction of the main body, the protrusion 2211 protrudes from the main body, and at least a portion of the wall thickness of the protrusion 2211 is greater than the wall thickness of the main body.

[0108] For example, a second receiving cavity 24 is formed between the first plate 221 and the box body 21.

[0109] Please refer to Figure 2 The battery includes a housing assembly 20 and a battery cell assembly, with the battery cell assembly disposed within the first receiving cavity 23 of the housing assembly 20.

[0110] The box assembly 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0111] The enclosure assembly 20 is used to install the battery cell 10. The enclosure assembly 20 can carry the battery cell 10, and the battery cell 10 is installed to the electrical equipment through the enclosure.

[0112] For example, the enclosure assembly 20 is typically a cuboid structure, with both its length and width directions parallel to the horizontal plane. The length direction of the enclosure assembly 20 is parallel to the longest side of its cuboid structure. The height direction of the enclosure assembly 20 is perpendicular to the ground. For example, as... Figure 4 and Figure 8 As shown, the length direction of the housing assembly 20 is the first direction, the width direction of the housing assembly 20 is the second direction, and the height direction of the housing assembly 20 is the third direction; or the length direction of the housing is the second direction, the width direction of the housing assembly 20 is the first direction, and the height direction of the housing assembly 20 is the third direction.

[0113] For example, the first plate 221 includes multiple layers of woven fabric composite material. Each layer of the woven fabric composite material includes fiber woven fabric and a resin matrix. The resin matrix bonds the fiber woven fabric together, making the fiber woven fabric and the resin matrix a whole, thereby giving the woven fabric composite material layer continuity and integrity. The fiber woven fabric is used to improve the strength and stiffness of the first plate 221, and enhance the mechanical properties of the first plate 221.

[0114] Here, the first plate 221 includes multiple layers of woven fabric composite material, which is lightweight and high-strength. This helps to reduce the weight of the first plate 221 and improve its structural strength.

[0115] Of course, the enclosure assembly 20 may also include multiple layers of composite material, which are lightweight and high-strength. This helps to reduce the weight of the enclosure assembly 20 and improve its structural strength.

[0116] For example, the fiber woven fabric includes one or more of glass fiber woven fabric, carbon fiber woven fabric, aramid fiber woven fabric, and basalt fiber woven fabric.

[0117] Here, the fiber woven fabric includes glass fiber woven fabric, carbon fiber woven fabric, aramid fiber woven fabric, and basalt fiber woven fabric as the reinforcing phase of the woven fabric composite material layer, which can give the first plate 221 a certain structural strength.

[0118] For example, the resin matrix includes one or more of epoxy resin, polyurethane resin, vinyl resin, polypropylene resin, and polyamide resin.

[0119] Here, epoxy resin, polyurethane resin, vinyl resin, polypropylene resin, and polyamide resin have good wear resistance, high toughness, adhesion, corrosion resistance, and heat resistance. The resin matrix plays the role of bonding and protecting the reinforcing phases such as fiber woven fabric and transferring the stress caused by external load to the reinforcing phases such as fiber woven fabric.

[0120] In this embodiment of the application, the first plate 221 includes a multi-layered woven fabric composite material layer, which improves the impact resistance and load-bearing capacity of the first plate 221.

[0121] The first plate 221 includes a protrusion 2211 and a main body. The protrusion 2211 protrudes from the main body along the wall thickness direction, which helps to further improve the impact resistance and load-bearing capacity of the first plate 221.

[0122] At least some of the protrusions 2211 have a wall thickness greater than that of the main body. By relatively increasing the wall thickness of the protrusions 2211, the protrusions 2211 have sufficient structural strength and impact resistance, and are easy to form. In addition, by relatively reducing the wall thickness of the main body, the space occupied and weight of the main body can be reduced as much as possible, thereby increasing the energy density of the battery device 100.

[0123] For example, please refer to Figure 11 The housing assembly 20 also includes a first air vent 241 and a second air vent 242 that are both connected to the second receiving cavity 24. In this way, a cooling circuit can be formed in the second receiving cavity 24, and the battery device 100 can cool the battery cells 10 in the first receiving cavity 23 through the cooling circuit during use.

[0124] For example, please refer to Figure 11 The first plate 221 has a first air inlet 241 and a second air inlet 242.

[0125] For example, the second receiving cavity 24 can be connected to the outside of the battery device 100 through the first air vent 241 and the second air vent 242.

[0126] For example, the second receiving cavity 24 may also be connected to the air cooling system of the battery device 100 or the air cooling system of the electrical device through the first air vent 241 and the second air vent 242.

[0127] Thus, the protrusion 2211 helps to reduce the gap between the first plate 221 and the box body 21, increase the fluid flow rate, and thus improve the cooling efficiency.

[0128] For example, the first cavity wall of the first receiving cavity 23 is provided with a pressure relief region 25, and the first receiving cavity 23 is connected to the second receiving cavity 24 through the pressure relief region 25.

[0129] The high-temperature fluid generated by thermal runaway of the battery device 100 can flow from the first receiving cavity 23 through the pressure relief area 25 into the second receiving cavity 24, and then be discharged through the second air outlet 242.

[0130] For example, the first plate 221 protrudes outward from the first receiving cavity 23 to form a protrusion 2211, which helps to reduce the gap between the first plate 221 and the box body 21, increase the fluid flow rate, and thus help to improve the exhaust efficiency.

[0131] The battery device 100 provided in this embodiment includes a housing assembly 20 and a battery cell assembly. The housing assembly 20 includes a housing body 21 and a plate structure 22. The housing body 21 has a first receiving cavity 23, in which the battery cell assembly is disposed, and the housing body 21 protects the battery cell assembly. Along the wall thickness direction of the main body, a protrusion 2211 protrudes from the main body, which helps to reduce the gap between the first plate 221 and the housing body 21, increasing the fluid flow rate, thereby improving cooling efficiency and exhaust efficiency. It also allows the high-temperature fluid generated by the thermal runaway of the battery cell 10 to be discharged in a timely manner, reducing the impact on other battery cells 10 and thus reducing the chain reaction of thermal runaway of the battery cell 10. Furthermore, it also helps to improve the structural strength of the first plate 221. Furthermore, by configuring the first plate 221 as comprising a multilayered woven fiber fabric and a resin matrix, on the one hand, the woven fiber fabric is lighter and stronger, which helps to reduce the weight of the first plate 221 and improve its structural strength, thereby improving the energy density and structural strength of the battery device 100. On the other hand, the woven fiber fabric has a high fiber curvature during its weaving process, making the protrusions 2211 of the first plate 221 easier to form. In addition, the woven fiber fabric is tightly woven and has high mechanical strength, making it less likely for the fibers to break apart after thermal runaway of the battery cell 10, thus improving the thermal protection performance of the housing assembly 20.

[0132] In some embodiments, the woven fabric includes one or more combinations of plain weave, twill weave, and satin weave.

[0133] In other words, the woven fabric can be one of plain weave, twill weave, or satin weave, or any two of plain weave, twill weave, or satin weave, or it can include plain weave, twill weave, and satin weave simultaneously.

[0134] In some embodiments, multiple layers of woven fabric composite material are laminated to form a woven fabric composite board, and the woven fabric composite board is molded to form a first plate 221.

[0135] In this embodiment, a woven fabric composite board is formed by laminating multiple layers of woven fabric composite material, and then the woven fabric composite board is molded to form a first plate 221. This molding process is simple and helps to improve manufacturing efficiency.

[0136] For example, the fiber woven fabric of the multilayer woven fabric composite layer is laid to form the outline of the first plate 221, and the resin matrix is ​​impregnated into the fiber woven fabric by injection molding to form the first plate 221.

[0137] For example, a resin matrix is ​​impregnated with a fiber woven fabric to form a woven fabric composite layer, and multiple woven fabric composite layers are laid to form a first plate 221.

[0138] Here, the resin matrix is ​​impregnated into the woven fabric to form a woven fabric prepreg layer.

[0139] In some embodiments, please refer to Figures 6 to 10 The first plate 221 includes a large surface area 2215 and a connecting area 2214. Projected along the thickness direction of the first plate 221, the projection of the battery cell 10 is located in the large surface area 2215. The protrusion 2211 includes a first protrusion 22111, which is disposed in the large surface area 2215.

[0140] Here, the large area 2215 is equivalent to the main body area of ​​the first plate 221, and is projected along the thickness direction of the first plate 221 so that the projection of the battery cell 10 is located in the large area 2215, and the connecting area 2214 is used to connect with the box body 21.

[0141] Thus, the arrangement of the first protrusion 22111 helps to reduce the gap between the first plate 221 and the box body 21, increase the fluid flow rate, and thus help to improve the cooling efficiency.

[0142] By protruding the first protrusion 22111 from the main body, it is beneficial to reduce the gap between the first plate 221 and the box body 21, increase the fluid flow rate, thereby improving the cooling efficiency and exhaust efficiency. It also allows the high-temperature fluid generated by the thermal runaway of the battery cell 10 to be discharged in time, which helps to reduce the impact on other battery cells 10, thereby reducing the chain reaction of thermal runaway of the battery cell 10. In addition, it also helps to improve the structural strength of the first plate 221.

[0143] In some embodiments, the first plate 221 includes a main woven fabric layer and an overlapping woven fabric layer stacked together. The main woven fabric layer forms a main body portion and a protrusion 2211. The main woven fabric layer located in the first protrusion 22111 has a slit 2212. The overlapping woven fabric layer is located in the first protrusion 22111 and covers the slit 2212.

[0144] Here, since the main woven fabric layer cannot be flatly covered at the first protrusion 22111, the first protrusion 22111 is reinforced by cutting a slit 2212 in the main woven fabric layer of the first protrusion 22111 and then overlapping the woven fabric layer with the main woven fabric layer of the first protrusion 22111 to cover the slit 2212.

[0145] In this embodiment, by opening a slit 2212 in the main woven fabric layer of the first protrusion 22111 and overlapping the woven fabric layer with the main woven fabric layer of the first protrusion 22111 to cover the slit 2212, the main woven fabric layer and the overlapping woven fabric layer can be flatly attached to the first protrusion 22111, and the overlapping woven fabric layer can also reinforce the first protrusion 22111.

[0146] In some embodiments, please refer to Figure 10 The cut 2212 includes a first sub-cut 22121 and at least one second sub-cut 22122. The first sub-cut 22121 extends along the extension direction of the first protrusion 22111. One end of the second sub-cut 22122 is connected to the first sub-cut 22121, and the other end extends toward the corner of the first protrusion 22111.

[0147] Here, the first protrusion 22111 is elongated and, by way of example, extends along a first direction and has four corners.

[0148] For example, the first opening 22121 is located in the middle of the first protrusion 22111. This facilitates the smooth application of the main woven fabric layer at the first protrusion 22111.

[0149] For example, the length of the first opening 22121 is less than the length of the first protrusion 22111. This facilitates the smooth application of the main woven fabric layer at the first protrusion 22111.

[0150] Here, the number of second sub-mouths 22122 can be one or more.

[0151] In the embodiments of this application, "multiple" refers to two or more items.

[0152] For example, the number of second sub-ports 22122 can be four. The four second sub-ports 22122 extend to the four corners of the first protrusion 22111, respectively.

[0153] In this embodiment, by setting the cut 2212 to include a first sub-cut 22121 and at least one second sub-cut 22122, and connecting one end of the second sub-cut 22122 to the first sub-cut 22121, and extending the other end toward the corner of the first protrusion 22111, it is beneficial to make the main woven fabric layer flatly covered at the first protrusion 22111.

[0154] In some embodiments, the first protrusion 22111 is provided with an overlapping woven fabric layer on at least one side along the thickness direction.

[0155] Here, the first protrusion 22111 may have an overlapping woven fabric layer on one side along the thickness direction, or the first protrusion 22111 may have overlapping woven fabric layers on both sides along the thickness direction.

[0156] In this embodiment, at least one side of the first protrusion 22111 along the thickness direction can be provided with an overlapping woven fabric layer, which can reinforce the first protrusion 22111 while making the surface of the first protrusion 22111 as smooth as possible.

[0157] In some embodiments, the wall thickness of the main body is 0.5mm-1.2mm.

[0158] The wall thickness of the main body can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, or 1.2mm, or any value between two of them.

[0159] Here, the greater the wall thickness of the main body, the better the structural strength and impact resistance of the first plate 221; the smaller the wall thickness of the main body, the better it is to reduce the space occupied and weight of the first plate 221.

[0160] In this embodiment, by setting the wall thickness of the main body to 0.5mm-1.2mm, the wall thickness within this range is appropriate. While ensuring that the first plate 221 has sufficient structural strength and impact resistance, the space occupied and weight of the first plate 221 can be reduced as much as possible, thereby improving the energy density of the battery device 100.

[0161] In some embodiments, the maximum wall thickness of the protrusion 2211 is 1 mm to 2.4 mm.

[0162] The maximum wall thickness of the protrusion 2211 can be any one of 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.4mm or any value between two of them.

[0163] Here, the greater the wall thickness of the protrusion 2211, the better it is for the forming and structural strength of the protrusion 2211; the smaller the wall thickness of the protrusion 2211, the better it is for reducing the space occupied and weight of the protrusion 2211.

[0164] In this embodiment, by setting the maximum wall thickness of the protrusion 2211 to 1mm-2.4mm, the wall thickness within this range is appropriate. This ensures that the protrusion 2211 has sufficient structural strength and impact resistance, and is easy to form, while also minimizing the space and weight occupied by the protrusion 2211, thereby improving the energy density of the battery device 100.

[0165] In some embodiments, please refer to Figure 8 The number of layers of woven fabric in the protrusion 2211 is greater than the number of layers of woven fabric in the main body.

[0166] For example, the ratio of the number of layers of woven fabric in the main body to the number of layers of woven fabric in the protrusion 2211 is 2:3 to 1:2.

[0167] Here, the main body can be the part of the first plate 221 where the protrusion 2211 is not formed.

[0168] For example, the number of layers of the woven fabric in the main body is less than the number of layers of the woven fabric in the protrusion 2211, that is, the wall thickness of the main body is less than the wall thickness of the protrusion 2211.

[0169] In this embodiment, the ratio of the number of fiber woven fabric layers in the main body to the number of fiber woven fabric layers in the protrusion 2211 is 2:3 to 1:2. That is, by relatively increasing the number of fiber woven fabric layers in the protrusion 2211, the protrusion 2211 has sufficient structural strength and impact resistance, and is easy to form. In addition, by relatively reducing the number of fiber woven fabric layers in the main body, the space occupied and weight of the main body can be reduced as much as possible, thereby increasing the energy density of the battery device 100.

[0170] In some embodiments, please refer to Figure 4 The height of the protrusion 2211 is 1mm-8mm. In other words, the protrusion of the protrusion 2211 toward the box body 21 is 1mm-8mm.

[0171] The protrusion 2211 protrudes toward the box body 21 by the following dimensions: Figure 4 H is shown.

[0172] The protrusion 2211 protrudes toward the box body 21 by any one of the following values ​​or any combination of two: 1mm, 1.3mm, 1.8mm, 2mm, 2.6mm, 3mm, 3.5mm, 4mm, 4.6mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.7mm, and 8mm.

[0173] In this embodiment, by setting the size of the protrusion 2211 protruding toward the box body 21 to 1mm-8mm, the first plate 221 has sufficient structural strength and impact resistance, while also allowing a certain gap between the protrusion 2211 and the box body 21, which is beneficial to improving cooling efficiency and exhaust efficiency.

[0174] In some embodiments, please refer to Figure 4 The gap between the protrusion 2211 and the box body 21 is 3mm-18mm.

[0175] The gap between the protrusion 2211 and the box body 21 is as follows Figure 4 The L shown.

[0176] Here, the gap between the protrusion 2211 and the box body 21 is the first gap, and fluid can flow in the first gap.

[0177] The gap between the protrusion 2211 and the box body 21 can be any one of 3mm, 3.5mm, 4mm, 5mm, 6mm, 8mm, 9mm, 10mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm or any combination thereof.

[0178] Here, reducing the gap between the protrusion 2211 and the box body 21 is beneficial to increasing the fluid velocity, while increasing the gap between the protrusion 2211 and the box body 21 is beneficial to increasing the fluid flow rate.

[0179] In this embodiment, by setting the gap between the protrusion 2211 and the housing body 21 to 3mm-18mm, it is beneficial to reduce the gap between the protrusion 2211 and the housing body 21 and increase the fluid flow rate. While ensuring that the fluid has a certain flow rate between the protrusion 2211 and the housing body 21, it also has a certain flow rate, which is beneficial to improving the cooling efficiency and exhaust efficiency.

[0180] In some embodiments, please refer to Figure 4 The gap between the protrusion 2211 and the box body 21 is 5mm-15mm.

[0181] The gap between the protrusion 2211 and the box body 21 can be any one of 5mm, 5.5mm, 6mm, 7mm, 7.7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or any combination thereof.

[0182] In this embodiment, by setting the gap between the protrusion 2211 and the housing body 21 to 5mm-15mm, it is further beneficial to ensure that the fluid has a certain flow rate and a certain flow velocity between the protrusion 2211 and the housing body 21, thereby further improving the cooling efficiency and exhaust efficiency.

[0183] It should be noted that there are multiple ways in which the protrusion 2211 can be formed.

[0184] In some embodiments, please refer to Figures 4 to 5 At least a portion of the sidewall of the first plate 221 facing away from the second receiving cavity 24 is recessed, so that the sidewall of the first plate 221 facing the second receiving cavity 24 protrudes to form a protrusion 2211.

[0185] In other embodiments, at least a portion of the sidewall of the first plate 221 facing the second receiving cavity 24 is thickened to form a protrusion 2211.

[0186] In some embodiments, please refer to Figure 8 and Figure 9 The first plate 221 includes a large surface area 2215 and a connecting area 2214. Projected along the thickness direction of the first plate 221, the projection of the battery cell 10 is located in the large surface area 2215. The protrusion 2211 includes a second protrusion 22112. The connecting area 2214 is connected to the housing body 21, and the second protrusion 22112 is disposed in the connecting area 2214.

[0187] The protrusion 2211 provides a second protrusion 22112 to give the connection area 2214 sufficient structural strength, thereby improving the reliability of the connection structure between the connection area 2214 and the box body 21.

[0188] In some embodiments, please refer to Figure 8 The large surface area 2215 has a groove, which together with the box body 21 forms a second receiving cavity 24. The connecting area 2214 is located around the large surface area 2215 and is used to connect with the box body 21.

[0189] For example, the large surface area 2215 is recessed to form a groove, and the groove wall defines a second receiving cavity 24 between the box body 21.

[0190] The connecting area 2214 is located around the large surface area 2215 and is connected to one end of the large surface area 2215 near the box body 21.

[0191] For example, the top of the large surface area 2215 is folded outward to form the connecting area 2214.

[0192] It should be noted that the specific method of connecting the connection area 2214 and the housing body 21 is not limited here. For example, the connection area 2214 and the housing body 21 can be fastened, welded, glued, or snap-fitted.

[0193] Specifically, the housing assembly 20 includes an adhesive layer, and the connection area 2214 is sealed to the housing body 21 through the adhesive layer. This connection structure is simple, improving assembly efficiency while reducing costs. Furthermore, it also improves the sealing performance between the first plate 221 and the housing body 21.

[0194] In some embodiments, please refer to Figures 7 to 9 The second protrusion 22112 is provided with a locking hole 2219, and the connecting area 2214 is connected to the box body 21 through the locking hole 2219.

[0195] The connecting area 2214 is connected to the box body 21 through the locking hole 2219. The connecting area 2214 has a locking hole 2219, and the box body 21 also has a locking hole 2219. The connection between the connecting area 2214 and the box body 21 is achieved by fasteners passing through the locking holes 2219 of the connecting area 2214 and the locking holes 2219 of the box body 21.

[0196] Here, by setting the locking hole 2219 in the second protrusion 22112, in other words, the area where the locking hole 2219 is set is thickened. This helps to improve the structural strength of the area where the locking hole 2219 is set and reduces the possibility of the hole edge splitting after fasteners are locked.

[0197] In this embodiment, by providing a locking hole 2219 in the second protrusion 22112, the area where the locking hole 2219 is provided is thickened to improve the structural strength of the locking hole 2219 area, thereby improving the reliability of the connection structure between the connection area 2214 and the box body 21.

[0198] In some embodiments, please refer to Figures 7 to 9 The minimum distance between the wall of the locking hole 2219 and the outer contour of the first plate 221 is 4mm-10mm.

[0199] The minimum distance between the locking hole 2219 and the outer contour of the first plate 221 is as follows: Figure 9 N1 is shown.

[0200] The minimum distance between the locking hole 2219 and the outer contour of the first plate 221 can be any one of 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or any two of them.

[0201] In this embodiment, by setting the minimum distance between the locking hole 2219 and the outer contour of the first plate 221 to 4mm-10mm, it is beneficial to further improve the reliability of the connection structure between the connection area 2214 and the box body 21, and also to minimize the space occupied and weight of the second protrusion 22112, so as to improve the energy density of the battery device 100.

[0202] In some embodiments, please refer to Figures 7 to 9 The second protrusion 22112 includes a first part 2217 and a second part 2218 connected to each other. The second part 2218 protrudes relative to the first part 2217 toward the side closer to the box body 21, and the second part 2218 forms a locking hole 2219.

[0203] In other words, the second part 2218 with the locking hole 2219 protrudes upward relative to the first part 2217, thus facilitating connection with the box body 21 by fasteners.

[0204] In this embodiment, the second part 2218 protrudes towards the side closer to the box body 21 relative to the first part 2217, which helps to reduce the space occupied by the fasteners and facilitates the connection between the first plate 221 and the box body 21.

[0205] In some embodiments, please refer to Figures 7 to 9 The first part 2217 has a radial dimension of 5mm-25mm along the locking hole 2219.

[0206] The first part 2217 has the following radial dimension along the locking hole 2219: Figure 9 N2 is shown.

[0207] The radial dimension of the first part 2217 along the locking hole 2219 can be any one of 5mm, 6mm, 8mm, 9mm, 10mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, or any value between two of them.

[0208] In this embodiment, by setting the radial dimension of the first part 2217 along the locking hole 2219 to 5mm-25mm, it is beneficial to further improve the reliability of the connection structure between the connection area 2214 and the box body 21, and also to minimize the space occupied and weight of the second protrusion 22112, so as to improve the energy density of the battery device 100.

[0209] In some embodiments, please refer to Figures 6 to 7 The main body area is rectangular, and each corner of the main body area is provided with a locking hole 2219.

[0210] Here, the main body area is rectangular, which means that the main body area can only be provided with locking holes 2219 at the four corners. While improving the reliability of the connection between the first plate 221 and the box body 21, reducing the number of locking holes 2219 is beneficial to reducing costs and improving assembly efficiency.

[0211] In some embodiments, please refer to Figures 3 to 8 The plate structure 22 includes at least one partition 222, which is disposed between the box body 21 and the first plate 221 and abuts against the box body 21 and the first plate 221 to form a pressure relief chamber 27 and an air-cooling channel 26. The partition 222 is configured to break in the event of thermal runaway of the battery cell 10, thereby connecting the pressure relief chamber 27 with the air-cooling channel 26.

[0212] Here, by setting the separator 222, the pressure relief chamber 27 is easily defined so as to keep the pressure relief chamber 27 sealed relative to the external environment. The separator 222 can also break under the action of the pressure relief airflow ejected from the pressure relief part of the battery cell 10 so that the pressure relief airflow enters the air-cooling channel 26 and is discharged to the external environment through the air-cooling channel 26, thereby improving the safety performance of the battery device 100.

[0213] For example, the partition 222 has a cavity inside, and the partition 222 is disposed between the housing body 21 and the first plate 221. The cavity wall of the cavity defines a pressure relief cavity 27 between the housing body 21 and the first plate 221. The pressure relief cavity 27 corresponds to the pressure relief area 25 of the housing body 21. The high-temperature fluid generated by the thermal runaway of the battery device 100 can flow from the first receiving cavity 23 through the pressure relief area 25 into the pressure relief cavity 27, and then be discharged through the pressure relief cavity 27 to the air-cooling channel 26, and discharged to the outside of the battery device 100 through the second air outlet 242 and / or the first air outlet 241.

[0214] Here, the first air vent 241 can be an air inlet, and the second air vent 242 can be an air outlet; of course, the first air vent 241 can be an air outlet, and the second air vent 242 can be an air inlet, which can be confirmed according to the requirements.

[0215] The outer area of ​​the separator 222 is the air-cooled flow channel 26.

[0216] For example, the number of separators 222 can be one or more.

[0217] In this embodiment, by setting the separator 222 to form a pressure relief chamber 27 and an air-cooling channel 26, the battery device 100 can cool the battery cell 10 through the second receiving chamber 24 under normal use, and can relieve pressure through the air-cooling channel 26 outside the second receiving chamber 24 when the battery cell 10 thermally runs away.

[0218] In some embodiments, please refer to Figures 3 to 8 The separator 222 extends along a first direction, and the separator 222 and at least a portion of the protrusion 2211 are alternately arranged along a second direction, the first direction intersecting the second direction.

[0219] Here, the separator 222 may be alternately arranged with the first protrusion 22111 along the second direction.

[0220] For example, the battery cell assembly includes a battery pack, which includes a plurality of battery cells 10 arranged along a first direction.

[0221] For example, the separator 222 corresponds one-to-one with the battery pack, that is, one separator 222 corresponds to one battery pack.

[0222] In this embodiment, by alternately arranging the separator 222 and the protrusion 2211 along the second direction, a cooling channel 26 is formed between the protrusion 2211 and the housing body 21, thereby achieving an orderly arrangement of the pressure relief chamber 27 and the cooling channel 26, which helps to reduce turbulence and improve cooling efficiency and exhaust efficiency.

[0223] In some embodiments, please continue reading Figures 3 to 8 The end of the separator 222 away from the box body 21 is connected to the first plate 221.

[0224] For example, the separator 222 is adhesively connected to the first plate 221.

[0225] In this embodiment, by connecting the end of the separator 222 away from the box body 21 to the first plate 221, the stability of the separator 222 is improved, thereby improving the cooling efficiency and exhaust efficiency.

[0226] In some embodiments, please refer to Figures 3 to 8 The separator 222 has a portion of its area near one end of the box body 21 connected to the box body 21, and another portion of its area separated from the box body 21.

[0227] In this way, on the one hand, the stability of the separator 222 can be improved, and on the other hand, it is beneficial for the high-temperature fluid generated by the thermal runaway of the battery cell 10 to flow out from the area where the separator 222 is separated from the box body 21, thereby improving the pressure relief efficiency.

[0228] For example, the separator 222 may be a separator frame.

[0229] For example, the partition 222 is rectangular and includes a first sidewall 2221, a second sidewall 2222, a third sidewall 2223, and a fourth sidewall 2224 connected in sequence. The first sidewall 2221 and the third sidewall 2223 are arranged opposite to each other along a first direction, and the second sidewall 2222 and the fourth sidewall 2224 are arranged opposite to each other along a second direction. The first sidewall 2221, the second sidewall 2222, the third sidewall 2223, and the fourth sidewall 2224 form a pressure relief cavity 27 located in the middle cavity wall between the box body 21 and the first plate. The first direction and the second direction are perpendicular to the thickness direction of the first plate.

[0230] For example, two side walls may be connected to the box body 21, and the other two side walls may be separated from the box body 21; three side walls may be connected to the box body 21, and the other side wall may be separated from the box body 21; or one side wall may be connected to the box body 21, and the other three side walls may be separated from the box body 21.

[0231] In some embodiments, please refer to Figure 6 The wall thickness of at least one of the first sidewall 2221 and the third sidewall 2223 is less than the wall thickness of the second sidewall 2222 and the fourth sidewall 2224.

[0232] Here, the wall thickness of one of the first sidewall 2221 and the third sidewall 2223 may be less than the wall thickness of the second sidewall 2222 and the fourth sidewall 2224, or the wall thickness of both the first sidewall 2221 and the third sidewall 2223 may be less than the wall thickness of the second sidewall 2222 and the fourth sidewall 2224.

[0233] The wall thickness of at least one of the first sidewall 2221 and the third sidewall 2223 is less than the wall thickness of the second sidewall 2222 and the fourth sidewall 2224. In other words, the pressure-bearing capacity of at least one of the first sidewall 2221 and the third sidewall 2223 is less than the pressure-bearing capacity of the second sidewall 2222 and the fourth sidewall 2224.

[0234] For example, the high-temperature fluid generated by the thermal runaway of the battery cell 10 can damage (melt or break, etc.) at least one of the first sidewall 2221 and the third sidewall 2223, and then flow into the air-cooled channel 26 from the damaged area and be depressurized through the first air outlet 241 and / or the second air outlet 242.

[0235] In this embodiment, by setting the wall thickness of at least one of the first sidewall 2221 and the third sidewall 2223 to be less than the wall thickness of the second sidewall 2222 and the fourth sidewall 2224, the high-temperature fluid generated by the thermal runaway of the battery cell 10 can preferentially flow out from the part with the smaller wall thickness, thereby improving the pressure relief efficiency and pressure relief reliability.

[0236] It should be noted that there are no restrictions on the material of the separator 222.

[0237] In some embodiments, the material of the separator 222 includes at least one of foam, plastic, or fuzz.

[0238] In some embodiments, please refer to Figure 5 , Figure 6 as well as Figure 11 The housing body 21 includes a first wall 213, on which the battery cell assembly is supported. A first plate 221 is disposed on the side of the first wall 213 opposite to the first receiving cavity 23. A cooling chamber is formed between the plate structure 22 and the first wall 213. The plate structure 22 is provided with a first air outlet 241 and a second air outlet 242 communicating with the cooling chamber.

[0239] In this embodiment, a cooling chamber is formed between the plate structure 22 and the first wall 213. A heat exchange medium can flow in the cooling chamber. The heat exchange medium flows through the first wall 213 and exchanges heat with the first wall 213, thereby realizing the heat exchange between the battery cell 10 inside the housing assembly 20 and the outside world, so as to cool or heat the battery cell 10.

[0240] In this embodiment, the heat exchange medium can flow into the air-cooled chamber through the air inlet, exchange heat with the first wall 213 in the air-cooled chamber, and the heat exchange medium after heat exchange flows out of the air-cooled chamber through the air outlet.

[0241] In this embodiment, the heat exchange medium can be a gaseous medium or a liquid medium. For example, the air inlet / outlet of the plate structure 22 is connected to an air conditioning system, a liquid cooling system, a fan device, etc.

[0242] In some examples, the air inlet / outlet can also be directly connected to the outside of the electrical equipment. For example, the electrical equipment is an aircraft, and the heat exchange medium is the airflow generated during the aircraft's flight. The airflow generated during the aircraft's flight is used to cool the battery cell 10. The airflow has a high velocity, which facilitates the cooling of the battery cell 10 and simplifies the heat exchange structure, contributing to the lightweight design of the aircraft.

[0243] In this embodiment, the first air vent 241 and the second air vent 242 may have the same or different structures; the first air vent 241 and the second air vent 242 may have the same or different sizes; the number of the first air vent 241 and the second air vent 242 may be the same or different. In some examples, the first air vent 241 and the second air vent 242 are provided in a one-to-one correspondence.

[0244] The arrangement of the first air vent 241 and the second air vent 242 can take many forms. In some examples, the first air vent 241 and the second air vent 242 are respectively located on different sides of the plate structure 22. For example, the first air vent 241 and the second air vent 242 are located on opposite sides of the plate structure 22 along a first direction or a second direction.

[0245] In other examples, one of the first air vents 241 and the second air vents 242 is located in the middle of the plate structure 22, and the other of the first air vents 241 and the second air vents 242 is located at the edge of the plate structure 22. For example, a plurality of first air vents 241 are arrayed in the middle of the plate structure 22, and a plurality of second air vents 242 are arranged around the edge of the plate structure 22.

[0246] The technical solution of this application embodiment provides an air-cooled chamber. The heat exchange medium flowing in the air-cooled chamber can enter the air-cooled chamber through one of the first air outlet 241 and the second air outlet 242, and exit the air-cooled chamber through the other of the first air outlet 241 and the second air outlet 242. The heat exchange medium in the air-cooled chamber exchanges heat with the first wall 213, thereby realizing the heat exchange between the battery cell 10 in the housing assembly 20 and the outside world, so as to maintain the battery cell 10 at a suitable temperature.

[0247] In some embodiments, please refer to Figure 6 The plate structure 22 also includes a flow collector 223. The first plate 221 is provided with a first air outlet 241 and a second air outlet 242. The flow collector 223 is disposed between the first plate 221 and the first wall 213, and forms a flow collection cavity with the first plate 221. The flow collector 223 is provided with a sub-flow outlet 2233, which connects to the ventilation and cooling chamber and the flow collection cavity.

[0248] In this embodiment of the application, the plate structure 22 may include one or more components. In some examples, the plate structure 22 includes a first plate 221, which is connected to the housing assembly 20 and encloses the housing assembly 20 to form a second receiving cavity 24, at least a portion of which forms an air-cooled chamber.

[0249] In some examples, the plate structure 22 further includes a manifold 223 disposed in the second receiving cavity 24; in other words, the manifold 223 is disposed between the first plate 221 and the first wall 213. The manifold 223 may be connected to at least one of the first plate 221 and the housing assembly 20.

[0250] In some examples, the manifold 223 is connected to the first plate 221 and the first wall 213 respectively. A part of the first plate 221 forms an air-cooled chamber with the manifold 223 and the housing assembly 20, and another part of the first plate 221 forms a manifold cavity with the manifold 223.

[0251] In this embodiment, the current collector 223 can be enclosed with the first plate 221 to form a current collector cavity. The current collector 223 is provided with a sub-flow port 2233. The current collector cavity is connected to the air-cooled chamber through the sub-flow port 2233. The first air outlet 241 and the second air outlet 242 can be provided on the first plate 221. The current collector cavity is connected to the outside through the first air outlet 241 and / or the second air outlet 242.

[0252] In one example, the aircraft includes a cabin shell with a communication hole, a plate structure 22 connected to the cabin shell, and a first air vent 241 / second air vent 242 connected to the external environment through the communication hole of the cabin shell.

[0253] In this embodiment, the current collector 223 can be provided with multiple sub-ports 2233, which correspond to different positions of the first wall 213. That is, the heat exchange medium in the current collector cavity can be distributed to different positions of the first wall 213 through the multiple sub-ports 2233, thereby realizing the distribution of the heat exchange medium. For example, more heat exchange medium is distributed to positions with more heat, such as the pressure relief section, and less heat exchange medium is distributed to the gaps between the battery cells 10.

[0254] It should be noted that multiple collection cavities are formed between the collection component 223 and the first plate 221, or multiple collection components 223 are provided on the first plate 221, and each collection component 223 is provided with a collection cavity, some of which are connected to the first air outlet 241, and other parts of which are connected to the second air outlet 242, and the different collection cavities are isolated from each other.

[0255] In some examples, please refer to Figure 6 The first plate 221 is provided with two flow collectors 223, namely the first flow collector 2231 and the second flow collector 2232. The flow collector cavity formed by the first flow collector 2231 is connected to the first air outlet 241, and the flow collector cavity formed by the second flow collector 2232 is connected to the second air outlet 242.

[0256] During the flow of the heat exchange medium, the heat exchange medium enters the collection cavity corresponding to the first collector 2231 through the first air outlet 241, and is distributed through the sub-outlet 2233 corresponding to the collection cavity. The distributed heat exchange medium enters the air-cooled chamber and exchanges heat with the first wall 213. The heat exchange medium after heat exchange enters the corresponding collection cavity through the sub-outlet 2233 of the second collector 2232, and flows out of the battery device 100 through the second air outlet 242 connected to the collection cavity.

[0257] The technical solution of this application embodiment, by setting a flow collector 223, forms a flow collecting cavity, which connects to the first air outlet 241 and the second air outlet 242, which facilitates the inflow or outflow of the heat exchange medium and reduces turbulence. The sub-outlets 2233 of the flow collector 223 can realize the distribution of the heat exchange medium, so as to distribute different flow rates of heat exchange medium to different positions in the air-cooled chamber, thereby improving the utilization rate of the heat exchange medium and facilitating the temperature equalization of the battery device 100.

[0258] In some embodiments, please refer to Figure 6 At least one of the current collector 223 and the first plate 221 includes a boss structure 2234, the boss structure 2234 forming a current collector cavity, and the sub-flow port 2233 is disposed on the boss structure 2234.

[0259] In this embodiment, the current collector 223 includes a boss structure 2234. The current collector 223 protrudes in a direction away from the first plate 221, thereby forming the boss structure 2234. In other words, the boss structure 2234 protrudes away from the first plate 221 and forms a current collection cavity between it and the first plate 221.

[0260] In this embodiment, the first plate 221 further includes an abutment wall connected to the first plate 221 and connected to the boss structure 2234. It is understood that the abutment wall surrounds the boss structure 2234. The abutment wall and the boss structure 2234 can be connected by integral molding or other methods, thus achieving good sealing performance.

[0261] In the description of this disclosure, references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described in this disclosure and the features of the different embodiments or examples without contradiction.

[0262] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A battery device, characterized by, The battery device includes a housing assembly and a battery cell assembly, the housing assembly comprising: The box body has a first receiving cavity inside, and the battery cell assembly is disposed in the first receiving cavity; A plate structure is provided on the side of the box body opposite to the first receiving cavity. The plate structure includes a first plate, which comprises multiple layers of woven fiber fabric and a resin matrix stacked together. The first plate includes a protrusion and a main body. Along the wall thickness direction of the main body, the protrusion protrudes from the main body, and at least a portion of the wall thickness of the protrusion is greater than the wall thickness of the main body.

2. The battery device according to claim 1, characterized by The number of layers of woven fabric located on the protrusion is greater than the number of layers of woven fabric located on the main body.

3. The battery device according to claim 1 or 2, characterized in that, The first plate protrudes from the first receiving cavity to form the protrusion.

4. The battery device according to any one of claims 1-3, characterized in that, The first plate includes a large surface area and a connecting area. Projected along the thickness direction of the first plate, the projection of the battery cell is located in the large surface area. The protrusion includes a first protrusion, which is disposed in the large surface area.

5. The battery device according to claim 4, characterized in that, The first plate includes a main woven fabric layer and an overlapping woven fabric layer stacked together. The main woven fabric layer forms the main body and the protrusion. The main woven fabric layer located in the first protrusion has a slit. The overlapping woven fabric layer is located in the first protrusion and covers the slit.

6. The battery device according to claim 5, characterized in that, The cut includes a first sub-cut and at least one second sub-cut. The first sub-cut extends along the extension direction of the first protrusion. One end of the second sub-cut is connected to the first sub-cut, and the other end extends toward the corner of the first protrusion.

7. The battery device according to any one of claims 1 to 6, characterized in that, The wall thickness of the main body is 0.5mm-1.2mm, and / or the maximum wall thickness of the protrusion is 1mm-2.4mm.

8. The battery device according to any one of claims 1 to 7, characterized by, The ratio of the number of layers of the woven fabric in the main body to the number of layers of the woven fabric in the protrusion is 2:3-1:

2.

9. The battery device according to any one of claims 1 to 8, characterized by, The height of the protrusion is 1mm-8mm.

10. The battery device according to any one of claims 1 to 9, characterized in that, The gap between the protrusion and the box body is 3mm-18mm.

11. The battery device according to any one of claims 1-10, characterized in that, The first plate includes a large surface area and a connecting area. Projected along the thickness direction of the first plate, the projection of the battery cell is located in the large surface area. The protrusion includes a second protrusion. The connecting area is connected to the box body, and the second protrusion is disposed in the connecting area.

12. The battery device according to claim 11, characterized in that, The large surface area has a groove, which, together with the box body, forms a second receiving cavity. The connecting area is located circumferentially on the large surface area and is used to connect with the box body; and / or... The enclosure assembly includes an adhesive layer, and the connection area is sealed to the enclosure body through the adhesive layer.

13. The battery device according to claim 11 or 12, characterized in that, The second protrusion is provided with a locking hole, and the connection area is connected to the box body through the locking hole.

14. The battery device according to claim 13, characterized in that, The minimum distance between the wall of the locking hole and the outer contour of the first plate is 4mm-10mm.

15. The battery device according to claim 13 or 14, characterized in that, The second protrusion includes a first part and a second part connected to each other. The second part protrudes relative to the first part toward the side closer to the box body, and the second part has the locking hole.

16. The battery device according to any one of claims 13 to 15, characterized in that, The connecting area is rectangular, and the locking hole is provided at each corner of the connecting area.

17. The battery device according to any one of claims 1 to 16, characterized in that, The plate structure includes at least one partition, which is disposed between the box body and the first plate and abuts against the box body and the first plate to form a pressure relief chamber and an air-cooling channel; The separator is configured to break in the event of thermal runaway of the battery cell, thereby connecting the pressure relief chamber with the air-cooling channel.

18. The battery device according to claim 17, characterized in that, The separator extends along a first direction, and the separator and at least a portion of the protrusion are alternately arranged along a second direction, the first direction intersecting the second direction.

19. The battery device according to claim 17 or 18, characterized in that, The partition includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall connected in sequence. The first sidewall and the third sidewall are arranged opposite each other along a first direction, and the second sidewall and the fourth sidewall are arranged opposite each other along a second direction. The first sidewall, the second sidewall, the third sidewall, and the fourth sidewall form the intermediate cavity wall of the pressure relief chamber located between the box body and the first plate. The first direction and the second direction are perpendicular to the thickness direction of the first plate.

20. The battery device according to claim 19, characterized in that, The wall thickness of at least one of the first sidewall and the third sidewall is less than the wall thickness of the second sidewall and the fourth sidewall.

21. The battery device according to any one of claims 1 to 20, characterized in that, The box body includes a first wall, and the battery cell assembly is supported on the first wall; the first plate is disposed on the side of the first wall away from the first receiving cavity, and a wind-cooled chamber is formed between the plate structure and the first wall, and the plate structure is provided with a first air outlet and a second air outlet communicating with the wind-cooled chamber.

22. The battery device according to claim 21, characterized in that, The plate structure also includes a flow collector. The first plate is provided with a first air outlet and a second air outlet. The flow collector is disposed between the first plate and the first wall, and forms a flow collection cavity with the first plate. The flow collector is provided with a sub-flow outlet, which connects the air-cooled chamber and the flow collection cavity.

23. The battery device according to claim 22, characterized in that, At least one of the current collector and the first plate includes a boss structure, the boss structure forming the current collection cavity, and the sub-flow outlet is disposed on the boss structure.

24. The battery device according to any one of claims 1 to 23, characterized in that, The woven fabric includes one or more combinations of plain weave, twill weave, and satin weave.

25. The battery device according to any one of claims 1 to 24, characterized in that, The woven fabric includes one or more of glass fiber woven fabric, carbon fiber woven fabric, aramid fiber woven fabric, and basalt fiber woven fabric; and / or, the resin matrix includes one or more of epoxy resin, polyurethane resin, vinyl ester resin, polypropylene resin, and polyamide resin.

26. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 25.

27. The electrical appliance according to claim 26, characterized in that, The electrical equipment includes aircraft.

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