Battery device, energy storage device and electric device

Abstract

The embodiment of the utility model provides a battery device, an energy storage device and a power utilization device. The battery device comprises a box body and a battery cell assembly. The box body has an accommodating cavity. The battery monomer assembly is arranged in the accommodating cavity, the battery monomer assembly comprises a plurality of battery packs which are arranged at intervals along the first direction, and each battery pack comprises a plurality of battery monomers which are distributed along the second direction; the box body comprises two end walls and at least one pulling plate. The two end walls are oppositely arranged in the second direction. The two opposite ends of the pulling plate in the second direction are connected to the two end walls respectively, the pulling plate is arranged between the adjacent battery packs, and the first direction, the second direction and the height direction of the battery device intersect. According to the battery device provided by the embodiment of the invention, the structural strength of the battery device can be improved, and the single battery expansion resistance of the battery device can be improved to a certain extent, so that the battery device can better meet the single battery expansion resistance requirement.

Description

Technical Field

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

[0002] 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 electrical devices equipped with battery units, the batteries can provide all or part of the power. In related technologies, the expansion of individual battery cells can exert significant pressure on the end walls of the casing. Therefore, improving the resistance of battery devices to individual cell expansion 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, an energy storage device, and an electrical device that can improve the battery device's resistance to cell expansion to a certain extent.

[0005] Therefore, a first aspect of the embodiments of this application provides a battery device, the battery device comprising:

[0006] The housing has a receiving cavity;

[0007] A battery cell assembly, wherein the battery cell assembly is disposed in the receiving cavity, the battery cell assembly includes a plurality of battery packs spaced apart along a first direction, and the battery packs include a plurality of battery cells distributed along a second direction;

[0008] The enclosure includes:

[0009] Two end walls, the two end walls being disposed opposite each other along the second direction;

[0010] At least one pull plate, the pull plate having opposite ends connected to the two end walls along the second direction, and the pull plate being disposed between adjacent battery packs, wherein the first direction, the second direction, and the height direction of the battery device intersect.

[0011] The battery device provided in this embodiment includes a housing and a battery cell assembly. The housing has a receiving cavity, and the battery cell assembly is disposed within the receiving cavity. The housing protects the battery cell assembly. The housing is provided with at least one pull plate, with its opposite ends along a second direction respectively connected to two end walls of the housing. The pull plate is positioned between adjacent battery cells. This arrangement enhances the structural strength of the battery device and, to a certain extent, improves its resistance to battery cell expansion, thereby enabling the battery device to better meet the requirements for resisting battery cell expansion.

[0012] In some embodiments, the pull plate includes multiple layers of composite material, each layer comprising fibers and a resin matrix.

[0013] In this embodiment, by including multiple layers of composite material in the pull plate, the composite material layers are lightweight and have high strength. This helps to reduce the weight of the pull plate and improve its structural strength, thereby improving the energy density and structural strength of the battery device.

[0014] In some embodiments, the pull plate includes a heat insulation layer, the composite material layer covers the outer surface of the heat insulation layer, and the thermal resistance of the heat insulation layer is greater than the thermal resistance of the composite material layer.

[0015] In this embodiment, by setting a heat insulation layer and covering the heat insulation layer with a composite material layer, the structural strength of the sheet metal can be further improved. Furthermore, by setting the thermal resistance of the heat insulation layer to be greater than that of the composite material layer, the sheet metal can also provide heat insulation.

[0016] In some embodiments, the thickness of the insulation layer is 0.2mm-0.6mm.

[0017] By setting the thickness of the insulation layer to 0.2mm-0.6mm, the heat-insulating plate can have a certain structural strength while also reducing its weight and manufacturing cost.

[0018] In some embodiments, the material of the insulation layer includes at least one of ceramic composite tape or mica.

[0019] Here, the ceramic composite strip or mica has a certain structural strength and a certain thermal resistance, thus giving the plate a certain structural strength and thermal insulation performance.

[0020] In some embodiments, the total thickness of the composite material layer on any side along the thickness direction of the insulation layer is 1.0 mm to 3 mm.

[0021] By setting the thickness of the composite material layer to 1.0mm-3mm, the tension plate can have a certain structural strength while also reducing its weight and manufacturing cost.

[0022] In some embodiments, the composite material layer includes a unidirectional fiber band in which fibers extend along the second direction.

[0023] In this embodiment, by setting the fibers in the unidirectional fiber band of the composite material layer to extend along the second direction, the tensile modulus of the pull plate along the second direction is increased. In this way, the modulus of the box along the second direction can be further increased, and the probability of expansion deformation of the two end walls and / or the amount of deformation when expansion deformation of the two end walls is reduced.

[0024] In some embodiments, the composite material layer further includes a fiber braided tape, and at least a portion of the composite material layer, at least the outermost layer of the pull plate, is the fiber braided tape.

[0025] In this embodiment, by making at least a portion of the composite material layer of the outermost layer of the pull plate a fiber woven strip, it is beneficial to improve the overall structural strength of the pull plate and the modulus of the pull plate in multiple directions, and to a certain extent, it is also convenient for production and manufacturing.

[0026] In some embodiments, the composite material layer comprises several layers of fiber prepreg.

[0027] In some embodiments, the housing includes a bottom plate that forms the bottom wall of the receiving cavity, and the end wall and the pull plate are both connected to the bottom plate; the end wall and / or the bottom plate include multiple layers of the composite material.

[0028] In this embodiment, by connecting both the end walls and the pull plate to the bottom plate, the overall integrity of the enclosure is improved, thereby enhancing its structural strength. Furthermore, by including composite material layers in the end walls and / or the bottom plate, the weight of the enclosure is further reduced, and its structural strength is further increased.

[0029] In some embodiments, the end wall, the pull plate, and the bottom plate are an integral structure.

[0030] In this embodiment, by setting the end wall, pull plate and bottom plate as an integrated structure, it is beneficial to reduce the number of parts, thereby improving assembly efficiency. In addition, it is also beneficial to further improve the overall integrity of the box, thereby improving the structural strength of the box.

[0031] In some embodiments, the composite material layer includes an adjacent first composite material layer, a second composite material layer, and a third composite material layer, wherein the first composite material layer, the second composite material layer, and the third composite material layer overlap each other;

[0032] Wherein, the first composite material layer extends from the surface of the end wall to the surface of the bottom wall to cover the connection line between the end wall and the bottom wall; the second composite material layer extends from the surface of the bottom wall to the surface of the pull plate to cover the connection line between the bottom wall and the pull plate; and the third composite material layer extends from the surface of the pull plate to the surface of the end wall to cover the connection line between the pull plate and the end wall.

[0033] In this embodiment, the end wall, pull plate and bottom plate are spliced ​​in a staggered manner by composite material layer to achieve integral molding of the end wall, pull plate and bottom plate. This allows the box body to be flatly covered at the corners of the end wall, pull plate and bottom plate, while also improving the structural strength of the box body.

[0034] In some embodiments, the fiber includes at least one of glass fiber and aramid fiber.

[0035] In some embodiments, the resin matrix includes at least one of epoxy resin, polyurethane resin, vinyl resin, polypropylene resin, and polyamide resin.

[0036] In some embodiments, the thickness of the pull plate is 3mm-6mm.

[0037] By setting the thickness of the sheet metal to 3mm-6mm, the sheet metal can have a certain structural strength while also reducing its weight and manufacturing cost.

[0038] In some embodiments, the maximum distance between the pull plate and the bottom wall of the receiving cavity is greater than or equal to the maximum distance between the shoulder of the battery cell and the bottom wall of the receiving cavity.

[0039] In this embodiment, by making the maximum distance between the pull plate and the bottom wall of the receiving cavity greater than or equal to the maximum distance between the shoulder of the battery cell and the bottom wall of the receiving cavity, the connection strength between the pull plate and the two end walls is improved, so that part of the expansion force borne by the two end walls is better transferred to the pull plate, thereby further improving the battery device's resistance to battery cell expansion.

[0040] A second aspect of this application provides an energy storage device, including the battery device described above.

[0041] A third aspect of this application provides an electrical device, including the battery device or the energy storage device described above.

[0042] In some embodiments, the electrical device includes an aircraft. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the vehicle structure provided in some embodiments of this disclosure;

[0044] Figure 2 This is an exploded perspective view of a battery device provided in some embodiments of the present disclosure;

[0045] Figure 3 This is a partial structural diagram of the box provided in some embodiments of this disclosure;

[0046] Figure 4 for Figure 3 A sectional view;

[0047] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0048] Explanation of reference numerals in the attached figures

[0049] 10. Battery pack; 11. Battery cell; 20. Housing; 21. Pull plate; 211. Composite material layer; 212. Insulation layer; 22. End wall; 23. Base plate; 24. Receiving cavity; 28. First housing; 29. ​​Second housing; 100. Battery assembly; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0050] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0051] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0057] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0058] In some implementations, the electrode assembly is a stacked structure.

[0059] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0060] 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.

[0061] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0062] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0063] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0064] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0071] In related technologies, the expansion of individual battery cells can exert significant pressure on the end walls of the casing. Therefore, improving the resistance of battery devices to individual cell expansion has become an important research direction in this field.

[0072] In view of this, in order to improve the resistance of the battery device to cell expansion, this disclosure provides a battery device including a housing and a cell assembly. The housing has a receiving cavity. The cell assembly is disposed in the receiving cavity, and the cell assembly includes a plurality of battery packs spaced apart along a first direction, and the battery packs include a plurality of battery cells distributed along a second direction. The housing includes two end walls and at least one pull plate. The two end walls are disposed opposite each other along the second direction. The pull plate is connected to the two end walls at opposite ends along the second direction, and the pull plate is disposed between adjacent battery packs, wherein the first direction, the second direction, and the height direction of the battery device intersect.

[0073] The battery device provided in this embodiment includes a housing and a battery cell assembly. The housing has a receiving cavity, and the battery cell assembly is disposed within the receiving cavity. The housing protects the battery cell assembly. The housing is provided with at least one pull plate, with its opposite ends along a second direction respectively connected to two end walls of the housing. The pull plate is positioned between adjacent battery cells. This arrangement enhances the structural strength of the battery device and, to a certain extent, improves its resistance to battery cell expansion, thereby enabling the battery device to better meet the requirements for resisting battery cell expansion.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] Please refer to Figure 1 The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0078] For example, the electrical device includes an aircraft.

[0079] 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.

[0080] Please see Figure 2In order to meet different power needs, the battery cell assembly includes multiple battery packs 10 spaced apart along a first direction, and the battery pack 10 includes multiple battery cells 11 distributed along a second direction.

[0081] A battery cell 11 refers to the smallest unit that makes up a battery module or battery pack. Multiple battery cells 11 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 11 are connected in both series and parallel configurations. Multiple battery cells 11 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 11 is housed within the housing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 11 first connected in series, parallel, or in a mixed configuration to form a battery device 100 module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 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 11. Each battery cell 11 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. A battery cell 11 can be cylindrical, flat, cuboid, or other shapes.

[0082] Please see Figures 2 to 5 This disclosure provides a battery device 100, which includes a housing 20 and battery cell assemblies. The housing 20 has a receiving cavity 24. The battery cell assembly is disposed in the receiving cavity 24 and includes a plurality of battery packs 10 spaced apart along a first direction. Each battery pack 10 includes a plurality of battery cells 11 distributed along a second direction. The housing 20 includes two end walls 22 and at least one pull plate 21. The two end walls 22 are disposed opposite each other along the second direction. The pull plate 21 is connected to the two end walls 22 at opposite ends along the second direction and is disposed between adjacent battery packs 10, wherein the first direction, the second direction, and the height direction of the battery device 100 intersect.

[0083] Please refer to Figure 2 The battery device 100 includes a housing 20 and a battery cell assembly. The housing 20 includes a first housing 28 and a second housing 29. The first housing 28 and the second housing 29 are arranged to form a receiving cavity 24, and the battery cell assembly is disposed in the receiving cavity 24 of the housing 20.

[0084] The box 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.

[0085] The housing 20 is used to install the battery cell 11. The housing 20 can support the battery cell 11, and the battery cell 11 is installed on the electrical equipment through the housing 20.

[0086] For example, the box 20 is typically a cuboid structure, with both its length and width directions parallel to the horizontal plane. The length direction of the box 20 is parallel to the longest side of its cuboid structure. The height of the box 20 is perpendicular to the ground. For example, as... Figure 2 As shown, the length direction of the box 20 is the first direction, and the width direction of the box 20 is the second direction; or the length direction of the box 20 is the second direction, and the width direction of the box 20 is the first direction.

[0087] The housing 20 is used to install the battery pack 10. The housing 20 can support individual battery cells 11, and the battery pack 10 is installed onto electrical equipment via the housing 20. As an example, the housing 20 is typically a cuboid structure. The length and width directions of the housing 20 are parallel to the horizontal plane, and the length direction of the housing 20 is parallel to the longest side of its cuboid structure. The height of the housing 20 is perpendicular to the ground.

[0088] The housing 20 includes two end walls 22, which are arranged opposite each other along the second direction and are located at both ends of the battery pack 10 along the second direction.

[0089] Here, the two end walls 22 are used to constrain the battery pack 10 in the second direction and at least to withstand the expansion force of the individual battery cells 11. Specifically, the expansion force refers to the force exerted on the housing 20 due to the expansion and deformation of the individual battery cells 11. As an example, the two end walls 22 primarily withstand the expansion force along the second direction.

[0090] In some related technologies, the end wall 22 is also referred to as the expansion beam of the box 20.

[0091] The specific structure and material of the end wall 22 are not limited. As an example, the end wall 22 can be a beam-like structure. At least a part of the structure of the end wall 22 can be made of composite materials or any other suitable materials, such as metal materials, polymer materials, etc.

[0092] The pull plate 21 is connected to the two end walls 22 at opposite ends along the second direction. Therefore, part of the expansion force borne by the two end walls 22 can be transmitted to the pull plate 21. In other words, the pull plate 21 can share the expansion force of the battery cell 11 with the two end walls 22, thereby improving the modulus and strength of the housing 20, especially improving the modulus of the housing 20 along the second direction, and reducing the probability of expansion deformation of the two end walls 22 and / or reducing the amount of deformation when expansion deformation occurs.

[0093] The battery packs 10 are spaced apart along a first direction, and the pull plates 21 are disposed between adjacent battery packs 10. Therefore, the pull plates 21 can also bear the expansion force of the individual battery cells 11 along the first direction, thereby further improving the modulus and strength of the housing 20, especially the modulus of the housing 20 along the first direction. In addition, by disposing of the pull plates 21 between adjacent battery packs 10, the space occupied by the individual battery cells 11 can be minimized to a certain extent, thereby minimizing the impact on the energy density of the battery device 100.

[0094] For example, the number of pull plates 21 can be one or more.

[0095] The "multiple" mentioned in the embodiments of this application refers to one or more.

[0096] The battery device 100 provided in this embodiment includes a housing 20 and a battery cell assembly. The housing 20 has a receiving cavity 24, and the battery cell assembly is disposed within the receiving cavity 24. The housing 20 protects the battery cell assembly. The housing 20 is provided with at least one pull plate 21. The two opposite ends of the pull plate 21 along a second direction are respectively connected to the two end walls 22 of the housing 20, and the pull plate 21 is disposed between adjacent battery packs 10. In this way, the structural strength of the battery device 100 can be improved, and the resistance of the battery device 100 to the expansion of the battery cells 11 can be improved to a certain extent, so that the battery device 100 can better meet the requirements for resisting the expansion of the battery cells 11.

[0097] In some embodiments, please refer to Figures 3 to 5 The pull plate 21 includes multiple layers of composite material layers 211, each of which includes fibers and a resin matrix.

[0098] Exemplarily, composite layer 211 includes a matrix phase and a reinforcing phase, the matrix phase bonding the reinforcing phase together to form a whole, thereby giving the composite material continuity and integrity. The reinforcing phase is used to improve the strength and stiffness of the composite material, enhancing its mechanical properties.

[0099] Here, the pull plate 21 includes a composite material layer 211, which is lightweight and high-strength. This helps to reduce the weight of the box 20 and improve the structural strength of the box 20.

[0100] For example, the fiber includes glass fiber or aramid fiber.

[0101] Here, glass fiber or aramid fiber is used as the reinforcing phase of the composite material layer 211, which can give the box 20 a certain structural strength.

[0102] For example, the resin matrix includes at least one of epoxy resin, polyurethane resin, vinyl resin, polypropylene resin, and polyamide resin.

[0103] Here, the resin matrix serves to bond and protect the reinforcing phases such as glass fibers or aramid fibers, and to transfer the stress caused by the applied load to the reinforcing phases such as glass fibers or aramid fibers.

[0104] For example, the composite material layer 211 includes several layers of fiber prepreg.

[0105] Specifically, the composite material layer 211 includes several layers of glass fiber prepreg.

[0106] In this embodiment, by including multiple layers of composite material 211 in the pull plate 21, the composite material 211 is lighter in weight and has higher strength. This helps to reduce the weight of the pull plate 21 and improve the structural strength of the pull plate 21, thereby helping to improve the energy density and structural strength of the battery device 100.

[0107] In some embodiments, please refer to Figures 4 to 5 The pull plate 21 includes a heat insulation layer 212, and a composite material layer 211 covers the outer surface of the heat insulation layer 212. The thermal resistance of the heat insulation layer 212 is greater than that of the composite material layer 211.

[0108] In this embodiment of the application, the outer wall of the pull plate 21 is formed by the composite material layer 211, that is, the composite material layer 211 forms the surface layer of the pull plate 21. A cavity is formed in the pull plate 21 within the composite material layer 211. By filling the cavity with the heat insulation layer 212, the composite material layer 211 of the pull plate 21 is supported, thereby improving the impact resistance and structural strength of the pull plate 21.

[0109] The composite material layer 211 covers the outer surface of the heat insulation layer 212, and the heat insulation layer 212 fills the composite material layer 211, providing support for the composite material layer 211 to a certain extent, which is beneficial to improving the structural strength of the tension plate 21.

[0110] Here, the thermal resistance of the insulation layer 212 is greater than that of the composite material layer 211, so the pull plate 21 can also play a role in thermal insulation.

[0111] For example, the composite material layer 211 and the thermal insulation layer 212 can be connected by an adhesive layer.

[0112] For example, the composite material layer 211 and the heat insulation layer 212 can be connected by a resin matrix.

[0113] In this embodiment, by providing a heat insulation layer 212 and covering the heat insulation layer 211 with a composite material layer 211, the structural strength of the pull plate 21 is further improved. In addition, by setting the thermal resistance of the heat insulation layer 212 to be greater than that of the composite material layer 211, the pull plate 21 can also provide a heat insulation effect.

[0114] In some embodiments, please refer to Figure 4 and Figure 5 The thickness of the insulation layer 212 is 0.2mm-0.6mm.

[0115] The thickness of the insulation layer 212 can be any one of 0.2mm, 0.3mm, 0.4mm, 0.5mm, or 0.6mm, or any value between two of them.

[0116] It is understandable that the greater the thickness of the insulation layer 212, the better it is to improve the structural strength and thermal insulation performance of the pull plate 21, while the smaller the thickness of the insulation layer 212, the better it is to reduce the weight and manufacturing cost of the pull plate 21.

[0117] By setting the thickness of the insulation layer 212 to 0.2mm-0.6mm, the pull plate 21 can have a certain structural strength while also reducing its weight and manufacturing cost.

[0118] For example, the material of the insulation layer 212 includes at least one of ceramic composite tape or mica.

[0119] Here, the ceramic composite strip or mica has a certain structural strength and a certain thermal resistance, thus giving the pull plate 21 a certain structural strength and thermal insulation performance.

[0120] In some embodiments, please refer to Figure 4 and Figure 5 The total thickness of the composite material layer 211 on any side of the insulation layer 212 along the thickness direction is 1.0mm-3mm.

[0121] The thickness of the composite material layer 211 can be any one of 1.0mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, or a value between any two.

[0122] It is understandable that the greater the thickness of the composite material layer 211, the better it is to improve the structural strength of the tension plate 21, and the smaller the thickness of the composite material layer 211, the better it is to reduce the weight and manufacturing cost of the tension plate 21.

[0123] By setting the thickness of the composite material layer 211 to 1.0mm-3mm, the tension plate 21 can have a certain structural strength while also reducing its weight and manufacturing cost.

[0124] In some embodiments, please continue reading Figure 4 and Figure 5 The thickness of the pull plate 21 is 3mm-6mm.

[0125] The thickness of the pull plate 21 can be any one of the following values ​​or any combination of two: 3mm, 3.2mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.5mm, 4.6mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.5mm, 5.7mm, 5.8mm, 5.9mm, and 6mm.

[0126] It is understandable that the greater the thickness of the pull plate 21, the better it is to improve the structural strength of the pull plate 21, and the smaller the thickness of the pull plate 21, the better it is to reduce the weight and manufacturing cost of the pull plate 21.

[0127] By setting the thickness of the pull plate 21 to 3mm-6mm, the pull plate 21 can have a certain structural strength while also reducing its weight and manufacturing cost.

[0128] In some embodiments, the composite material layer 211 includes a unidirectional fiber band in which fibers extend in a second direction.

[0129] For example, the composite material layer 211 includes a continuous unidirectional fiber strip.

[0130] The fibers in the unidirectional fiber belt extend along the second direction, so that the composite material layer 211 has a greater structural strength along the second direction, which can increase the tensile modulus of the tension plate 21 along the second direction.

[0131] In this embodiment, by setting the fibers in the unidirectional fiber band of the composite material layer 211 to extend along the second direction, the tensile modulus of the pull plate 21 along the second direction is increased. In this way, the modulus of the box 20 along the second direction can be further increased, and the probability of expansion deformation of the two end walls 22 and / or the amount of deformation when expansion deformation of the two end walls 22 is reduced.

[0132] In some embodiments, the composite material layer 211 further includes a fiber braided strip, and at least a portion of the composite material layer 211, at least the outermost layer of the pull plate 21, is a fiber braided strip.

[0133] For example, the fiber braided tape can be a fiber braided fabric.

[0134] Here, the pull plate 21 may be at least part of the outermost composite material layer 211, which is a fiber braided tape, or the other composite material layers 211 besides the outermost layer may also include fiber braided tape.

[0135] Here, the inner layer of the composite material layer 211 includes a unidirectional fiber tape, and the outer layer of the composite material layer 211 includes a fiber braided tape, which is beneficial to improving the modulus of the composite material layer 211 in multiple directions.

[0136] In this embodiment, by making at least a portion of the composite material layer 211 of the outermost layer of the pull plate 21 a fiber braided strip, it is beneficial to improve the overall structural strength of the pull plate 21 and the modulus of the pull plate 21 in multiple directions, and to a certain extent, it is also convenient for manufacturing.

[0137] In some embodiments, please refer to Figures 3 to 5 The housing 20 includes a bottom plate 23, which forms the bottom wall of the receiving cavity 24. The end wall 22 and the pull plate 21 are both connected to the bottom plate 23. The end wall 22 and / or the bottom plate 23 include multiple layers of composite material 211.

[0138] Here, the base plate 23 forms the bottom wall of the receiving cavity 24, and the battery cell 11 is disposed in the receiving cavity 24, that is, the battery cell 11 is supported by the base plate 23, thus the base plate 23 has a certain load-bearing capacity.

[0139] Both the end wall 22 and the pull plate 21 are connected to the bottom plate 23, which helps to improve the overall integrity of the box 20 and thus improve the structural strength of the box 20.

[0140] Here, the end wall 22 may include multiple layers of composite material 211, the base plate 23 may include multiple layers of composite material 211, or both the end wall 22 and the base plate 23 may include multiple layers of composite material 211.

[0141] Here, the end wall 22 and / or the bottom plate 23 include a composite material layer 211, which helps to further reduce the mass of the box 20 and improve the structural strength of the box 20.

[0142] In this embodiment, by connecting both the end wall 22 and the pull plate 21 to the bottom plate 23, the overall integrity of the box 20 is improved, thereby increasing the structural strength of the box 20. Furthermore, by including a composite material layer 211 in the end wall 22 and / or the bottom plate 23, the weight of the box 20 is further reduced, and the structural strength of the box 20 is further improved.

[0143] In some embodiments, please refer to Figures 3 to 5 The end wall 22, the pull plate 21, and the bottom plate 23 are an integral structure.

[0144] In this embodiment, by setting the end wall 22, pull plate 21 and bottom plate 23 as an integral structure, it is beneficial to reduce the number of parts, thereby improving assembly efficiency. In addition, it is also beneficial to further improve the integrity of the box 20, thereby improving the structural strength of the box 20.

[0145] In some embodiments, please refer to Figures 3 to 5 The composite material layer 211 includes an adjacent first composite material layer, a second composite material layer, and a third composite material layer, which overlap each other. Specifically, the first composite material layer extends from the surface of the end wall 22 to the surface of the bottom wall to cover the connection line between the end wall 22 and the bottom wall; the second composite material layer extends from the surface of the bottom wall to the surface of the pull plate 21 to cover the connection line between the bottom wall and the pull plate 21; and the third composite material layer extends from the surface of the pull plate 21 to the surface of the end wall 22 to cover the connection line between the pull plate 21 and the end wall 22.

[0146] In other words, the end wall 22, the pull plate 21 and the bottom plate 23 all include a composite material layer 211, which can be used to form the end wall 22, the pull plate 21 and the bottom plate 23.

[0147] Here, since the composite material layer 211 cannot be flatly applied at the corners of the end wall 22, the pull plate 21 and the bottom plate 23 by the same composite material layer 211, the connecting lines of the end wall 22, the pull plate 21 and the bottom plate 23 can be covered by splicing multiple layers of composite material layer 211 in a staggered manner, so as to achieve a flat outer surface of the end wall 22, the pull plate 21 and the bottom plate 23.

[0148] For example, the staggered splice width of adjacent composite material layers 211 is typically greater than or equal to 10 mm.

[0149] Here, the connecting line between end wall 22 and bottom wall refers to the corner between end wall 22 and bottom wall, the connecting line between bottom wall and pull plate 21 refers to the corner between bottom wall and pull plate 21, and the connecting line between pull plate 21 and end wall 22 refers to the corner between pull plate 21 and end wall 22.

[0150] Here, by extending the first composite material layer from the surface of the end wall 22 to the surface of the bottom wall to cover the connection line between the end wall 22 and the bottom wall, extending the second composite material layer from the surface of the bottom wall to the surface of the pull plate 21 to cover the connection line between the bottom wall and the pull plate 21, and extending the third composite material layer from the surface of the pull plate 21 to the surface of the end wall 22 to cover the connection line between the pull plate 21 and the end wall 22, staggered splicing between the end wall 22, the pull plate 21 and the bottom plate 23 is achieved.

[0151] It should be noted that, in addition to the specific method of staggered splicing mentioned above, the end wall 22, the tie plate 21 and the bottom plate 23 can also be staggered spliced ​​in other ways.

[0152] In this embodiment, the end wall 22, the pull plate 21 and the bottom plate 23 are spliced ​​in a staggered manner through the composite material layer 211 to achieve the integral molding of the end wall 22, the pull plate 21 and the bottom plate 23. This allows the box body 20 to be flatly covered at the corners of the end wall 22, the pull plate 21 and the bottom plate 23, while also improving the structural strength of the box body 20.

[0153] In some embodiments, please refer to Figures 2 to 5 The maximum distance between the pull plate 21 and the bottom wall of the receiving cavity 24 is greater than or equal to the maximum distance between the shoulder of the battery cell 11 and the bottom wall of the receiving cavity 24.

[0154] In other words, the pull plate 21 is higher than the shoulder of the battery cell 11.

[0155] In this embodiment, by making the maximum distance between the pull plate 21 and the bottom wall of the receiving cavity 24 greater than or equal to the maximum distance between the shoulder of the battery cell 11 and the bottom wall of the receiving cavity 24, the connection strength between the pull plate 21 and the two end walls 22 is improved, so that part of the expansion force borne by the two end walls 22 is better transmitted to the pull plate 21, and the anti-expansion performance of the battery device 100 against the battery cell 11 is further improved.

[0156] 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.

[0157] 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 in that, The battery device includes: The housing has a receiving cavity; A battery cell assembly, wherein the battery cell assembly is disposed in the receiving cavity, the battery cell assembly includes a plurality of battery packs spaced apart along a first direction, and the battery packs include a plurality of battery cells distributed along a second direction; The enclosure includes: Two end walls, the two end walls being disposed opposite each other along the second direction; At least one pull plate, the pull plate having opposite ends connected to the two end walls along the second direction, and the pull plate being disposed between adjacent battery packs, wherein the first direction, the second direction, and the height direction of the battery device intersect.

2. The battery device according to claim 1, characterized in that, The pull plate comprises multiple layers of composite material, each of which includes fibers and a resin matrix.

3. The battery device according to claim 2, characterized in that, The pull plate includes a heat insulation layer, and the composite material layer covers the outer surface of the heat insulation layer. The thermal resistance of the heat insulation layer is greater than that of the composite material layer.

4. The battery device according to claim 3, characterized in that, The thickness of the insulation layer is 0.2mm-0.6mm.

5. The battery device according to claim 3 or 4, characterized in that, The material of the insulation layer includes at least one of ceramic composite tape or mica.

6. The battery device according to any one of claims 3 to 5, characterized in that, The total thickness of the composite material layer on any side along the thickness direction of the insulation layer is 1.0mm-3mm.

7. The battery device according to any one of claims 2 to 6, characterized in that, The composite material layer includes a unidirectional fiber band, in which fibers extend along the second direction.

8. The battery device according to claim 7, characterized in that, The composite material layer further includes a fiber braided tape, and at least a portion of the outermost layer of the composite material layer is the fiber braided tape.

9. The battery device according to any one of claims 2 to 6, characterized in that, The composite material layer comprises several layers of fiber prepreg.

10. The battery device according to claim 2, characterized in that, The housing includes a bottom plate, which forms the bottom wall of the receiving cavity. The end wall and the pull plate are both connected to the bottom plate. The end wall and / or the bottom plate include multiple layers of the composite material.

11. The battery device according to claim 10, characterized in that, The end wall, the pull plate, and the bottom plate are an integral structure.

12. The battery device according to claim 10 or 11, characterized in that, The composite material layer includes an adjacent first composite material layer, a second composite material layer and a third composite material layer, wherein the first composite material layer, the second composite material layer and the third composite material layer overlap each other; Wherein, the first composite material layer extends from the surface of the end wall to the surface of the bottom wall to cover the connection line between the end wall and the bottom wall; the second composite material layer extends from the surface of the bottom wall to the surface of the pull plate to cover the connection line between the bottom wall and the pull plate; and the third composite material layer extends from the surface of the pull plate to the surface of the end wall to cover the connection line between the pull plate and the end wall.

13. The battery device according to any one of claims 2 to 12, characterized in that, The fiber includes at least one of glass fiber and aramid fiber.

14. The battery device according to any one of claims 2 to 13, characterized in that, The resin matrix includes at least one of epoxy resin, polyurethane resin, vinyl resin, polypropylene resin, and polyamide resin.

15. The battery device according to any one of claims 1 to 14, characterized in that, The thickness of the pull plate is 3mm-6mm.

16. The battery device according to any one of claims 1 to 15, characterized in that, The maximum distance between the pull plate and the bottom wall of the receiving cavity is greater than or equal to the maximum distance between the shoulder of the battery cell and the bottom wall of the receiving cavity.

17. An energy storage device, characterized in that, Includes the battery device according to any one of claims 1 to 16.

18. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 16 or the energy storage device according to claim 17.

19. The electrical appliance according to claim 18, characterized in that, The electrical equipment includes aircraft.

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