A battery device and an electric device

Abstract

The embodiment of the present disclosure provides a battery device and a power utilization device, and belongs to the technical field of batteries. A battery monomer assembly is arranged in a box body, the battery device is configured to be movable relative to a base when subjected to external action, the base is used for carrying the battery monomer assembly, the arrangement direction of the base and the battery monomer assembly is a first direction, and the direction in which the battery monomer assembly is movable relative to the box body intersects the first direction. After the battery device is subjected to a collision, the battery monomer assembly can move in the box body along a direction intersecting the first direction, the resistance during the movement of the battery monomer assembly can consume collision energy, and the possibility of damage to the battery monomer assembly after the battery device is subjected to the collision can be reduced. In the case that the box body is deformed along a direction intersecting the first direction after the collision, the battery monomer assembly can move to avoid the position of the deformation of the box body, the battery monomer assembly is reduced in extrusion by the box body, and the possibility of damage to the battery monomer assembly after the battery device is subjected to the collision can be reduced.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and more particularly 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 equipment equipped with batteries has been widely used. In addition, batteries are increasingly being used in the field of energy storage.

[0003] In related technologies, collisions to battery devices may cause damage to individual battery cells and components. Summary of the Invention

[0004] This disclosure provides a battery device and an electrical device to reduce the possibility of damage to individual battery cells after a collision.

[0005] The technical solution of this disclosure embodiment is implemented as follows:

[0006] The first aspect of this disclosure provides a battery device, comprising:

[0007] The enclosure, including the base;

[0008] A battery cell assembly includes battery cells, the battery cell assembly is disposed within the housing, the battery device is configured such that when subjected to external forces, the battery cell assembly is movable relative to the base, the base is used to support the battery cell assembly, the base and the battery cell assembly are arranged in a first direction, and the direction in which the battery cell assembly moves relative to the housing intersects with the first direction.

[0009] In this embodiment of the present disclosure, the battery cell assembly can move within the housing along a direction intersecting with the first direction. The resistance during the movement of the battery cell assembly can consume the collision force, reduce the collision force on the battery cell assembly, and reduce the possibility of damage to the battery cell assembly after a collision with the battery device. The battery cell assembly can move to avoid the position where the housing is deformed along the direction intersecting with the first direction, reduce the damage to the battery cell assembly caused by the housing squeezing the battery cell assembly, and reduce the possibility of damage to the battery cell assembly after a collision with the battery device.

[0010] In some embodiments, the battery device further includes a movable mechanism that supports the battery cell assembly along the first direction on the side of the battery cell assembly facing the base to move the battery cell assembly.

[0011] In this embodiment of the disclosure, the battery cell assembly is moved by a moving mechanism, which reduces the direct contact between the battery cell assembly and the base and reduces wear on the battery cell assembly during the movement.

[0012] In some embodiments, the movable mechanism includes a rolling element disposed on the base, the rolling element being configured to rotatably relative to the base and abutting against the battery cell assembly, such that when the battery cell assembly moves under external forces, the rolling element can be driven to roll relative to the base and the battery cell assembly.

[0013] In this embodiment of the disclosure, the collision energy is consumed by the rolling of the rolling body, thereby reducing the possibility of damage to individual battery cells after a collision.

[0014] In some embodiments, the battery device further includes a base, the rolling element is located within the base, the base is connected to the housing, and the battery cell assembly moves when the battery device is subjected to external forces to drive the rolling element to roll within the base.

[0015] In this embodiment of the disclosure, the rolling element can roll within the base. The rolling element used for rolling does not need to be connected to the individual component or the housing, the structure is relatively simple, and the rolling element is easy to install.

[0016] In some embodiments, the base has a mounting groove, the base being at least partially located within the mounting groove, and the rolling element protruding along the first direction from the side of the base facing the battery cell assembly.

[0017] In this embodiment of the disclosure, the base is at least partially located in the mounting groove. The base is set in the space along the first direction of the base, which reduces the space occupied by the rolling element in the battery device along the first direction. The rolling element protrudes from the side of the base facing the battery cell assembly along the first direction, so that the side of the battery cell assembly facing the battery cell assembly along the first direction is preferentially spaced from the base, thereby reducing wear caused by contact between the battery cell assembly and the base.

[0018] In some embodiments, the battery device further includes a separator pad connected to the base on one side facing the battery cell assembly along the first direction;

[0019] On the same projection plane perpendicular to the first direction, the projection area of ​​the isolation pad and the projection area of ​​the base are offset, and the rolling element protrudes from the side of the isolation pad facing the battery cell assembly along the first direction.

[0020] In this embodiment of the disclosure, the base is isolated from the area of ​​the battery cell assembly that is not in contact with the rolling element by the isolation pad. In the event of base deformation, the battery cell assembly will not directly contact the base, thereby reducing abnormal noise and wear caused by contact between the base and the battery cell assembly.

[0021] In some embodiments, the maximum distance by which the rolling element protrudes from the side of the insulating pad toward the battery cell assembly along the first direction is a first distance, and the first distance is greater than or equal to 1 mm.

[0022] In this embodiment of the disclosure, the first distance is within a suitable range, which can reduce the possibility of contact between the battery cell assembly and the base insulating pad, and make the size of the battery device along the first direction more suitable.

[0023] In some embodiments, the battery device further includes a carrier in contact with the rolling element, the movable mechanism being supported along the first direction on the side of the carrier facing the base, the battery cell assembly being located on the side of the carrier away from the movable mechanism along the first direction, the base carrying the battery cell assembly via the carrier, and the carrier being spaced apart from the insulating pad along the first direction.

[0024] In this embodiment of the disclosure, the carrier protects the battery cell assembly, reducing the possibility of damage to the battery cell assembly. The carrier is arranged at intervals with the isolation pad along the first direction, reducing wear between the carrier and the isolation pad. In the event of base deformation, the possibility of the carrier being lifted off the rolling element by the isolation pad is reduced.

[0025] In some embodiments, the battery cell assembly has rolling elements disposed on opposite sides along a second direction, the second direction intersecting the first direction; and / or, the number of rolling elements is at least two, the at least two rolling elements are spaced apart along a third direction, the third direction intersecting the first direction.

[0026] In this embodiment of the present disclosure, the battery cell assembly can be supported by rolling elements on both sides along the second direction and / or the third direction, thereby improving the uniformity of force on the battery cell assembly along the second direction and / or the third direction and making the battery cell assembly move more smoothly.

[0027] In some embodiments, the battery device further includes a carrier, the battery cell assembly being connected to the carrier on a side away from the base along the first direction, and a movable mechanism being supported on the carrier on a side facing the base along the first direction, the movable mechanism being disposed on the carrier and / or the housing.

[0028] In this embodiment of the disclosure, the carrier and the battery cell assembly are moved by the moving mechanism. The carrier protects the battery cell assembly, and the battery cell assembly does not come into direct contact with the moving mechanism, thereby reducing the possibility of damage to the battery cell assembly.

[0029] In some embodiments, the battery device further includes a carrier movably disposed on the housing, the battery cell assembly being connected to the carrier, and the base supporting the battery cell assembly via the carrier.

[0030] In this embodiment of the disclosure, the battery cell assembly is moved relative to the housing by the carrier, and the carrier and the battery cell assembly are subjected to force as a whole, which improves the structural strength of the battery device and facilitates the installation of the battery cell assembly and the carrier as a whole module.

[0031] In some embodiments, the carrier includes a protective ring and a carrier plate interconnected, the protective ring surrounding the battery cell assembly, and the carrier plate located on the side of the battery cell assembly facing the base along the first direction, the battery cell assembly being connected to the protective ring and / or the carrier plate.

[0032] In this embodiment of the present disclosure, the protective ring protects the battery cell assembly from the surrounding area, and the support plate protects the battery cell assembly from the side of the battery cell assembly facing the base along the first direction, thereby improving the protection of the battery cell assembly by the support member and reducing damage to the battery cell assembly in contact with the base and the generation of abnormal noise.

[0033] In some embodiments, the carrier includes a weight-reducing hole, which is a blind hole or a through hole.

[0034] In this embodiment of the present disclosure, the support member can be provided with weight reduction holes as needed, so as to reduce the weight of the support member while satisfying the structural strength of the support member, thereby reducing the weight of the battery device.

[0035] In some embodiments, the base includes at least two crossbeams spaced apart along a second direction that intersects the first direction, and the at least two crossbeams are used to support the battery cell assembly.

[0036] In this embodiment of the disclosure, at least two crossbeams are arranged at intervals along a second direction. When the spaced crossbeams meet the requirements for supporting the battery cell assembly, the spaced arrangement of at least two crossbeams can reduce the weight of the base, thereby reducing the weight of the battery device.

[0037] In some embodiments, the housing includes a enclosure connected to the base, the enclosure surrounding the base, and the battery cell assembly moving within the area enclosed by the enclosure.

[0038] In this embodiment of the disclosure, the enclosure can support and secure the battery cell assembly from the surroundings, thereby protecting the battery cell assembly.

[0039] In some embodiments, the battery device further includes a carrier movably disposed on the housing, the battery cell assembly is connected to the carrier, the base supports the battery cell assembly via the carrier, and the carrier is spaced apart from the enclosure when the battery cell assembly is in a preset position.

[0040] In this embodiment of the disclosure, the carrier and the enclosure are arranged at intervals to reduce the direct transmission of collision force to the carrier, so that the carrier can drive the battery cell assembly to move in multiple directions intersecting with the first direction, thereby reducing the vibration transmitted to the battery cell assembly and reducing the possibility of damage to the battery cell assembly after a collision.

[0041] In some embodiments, the battery device further includes a buffer element connected to the inside of the enclosure.

[0042] In this embodiment of the disclosure, the buffer can buffer the vibration between the battery cell assembly and the enclosure, reduce the vibration transmitted to the battery cell assembly, and limit the contact between the battery cell assembly and the enclosure during the movement of the battery cell assembly, thereby reducing the abnormal noise generated by the contact between the battery cell assembly and the enclosure.

[0043] In some embodiments, the battery device further includes a carrier movably disposed on the housing, the battery cell assembly is connected to the carrier, the base supports the battery cell assembly via the carrier, the carrier is spaced from the buffer along at least one side of the second direction and / or the third direction, the second direction intersects the first direction, and the third direction intersects the first direction and the second direction respectively.

[0044] In this embodiment of the disclosure, there is a large space within the enclosure along the second direction and / or the third direction for the carrier to move the battery cell assembly, thereby reducing the impact damage to the battery cell assembly behind the battery device.

[0045] In some embodiments, along the second direction, when one side of the carrier is in contact with the buffer, the minimum distance between the other side of the carrier and the enclosure is a second distance, which is 5mm to 15mm.

[0046] In this embodiment of the disclosure, the second distance is within a suitable range, which can meet the requirement that the carrier can drive the battery cell assembly to move along the second direction to consume collision energy, and also ensure that the size of the battery device along the second direction is within a suitable range, taking into account the volumetric energy density requirement of the battery device.

[0047] In some embodiments, along the third direction, when one side of the carrier contacts the buffer, the minimum distance between the other side of the carrier and the enclosure is a third distance, which is 5mm to 15mm.

[0048] In this embodiment of the disclosure, the third distance is within a suitable range, which can meet the requirement that the carrier can drive the battery cell assembly to move along the third direction to consume collision energy, and also ensure that the size of the battery device along the third direction is within a suitable range, taking into account the volumetric energy density requirement of the battery device.

[0049] A second aspect of this disclosure provides an electrical device, including the battery device described above.

[0050] In this embodiment of the present disclosure, the battery cell assembly can move within the housing along a direction intersecting with the first direction. The resistance during the movement of the battery cell assembly can consume the collision force, reduce the collision force on the battery cell assembly, and reduce the possibility of damage to the battery cell assembly after a collision with the battery device. The battery cell assembly can move to avoid the position where the housing is deformed along the direction intersecting with the first direction, reduce the damage to the battery cell assembly caused by the housing squeezing the battery cell assembly, and reduce the possibility of damage to the battery cell assembly after a collision with the battery device. Attached Figure Description

[0051] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0052] Figure 1 This is a schematic diagram of the structure of the electrical device provided in the embodiments of this disclosure;

[0053] Figure 2 This is an exploded schematic diagram of the battery device provided in the embodiments of this disclosure;

[0054] Figure 3 This is a schematic diagram of the structure of the battery device provided in the embodiments of this disclosure;

[0055] Figure 4 yes Figure 3 Sectional view at point AA;

[0056] Figure 5 yes Figure 4 Enlarged view at point B;

[0057] Figure 6 yes Figure 3 Sectional view at CC;

[0058] Figure 7 This is an isometric structural schematic diagram of the battery device provided in the embodiments of this disclosure;

[0059] Figure 8 This is a schematic diagram of the structure of the base and enclosure of the battery device provided in the embodiments of this disclosure;

[0060] Figure 9 yes Figure 8 Sectional view at point DD;

[0061] Figure 10 This is an isometric structural diagram of the base and enclosure of the battery device provided in the embodiments of this disclosure.

[0062] Explanation of reference numerals in the attached figures

[0063] 1. Housing; 11. First housing; 12. Second housing; 13. Base; 131. Mounting slot; 132. Crossbeam; 14. Enclosure; 2. Battery cell assembly; 21. Battery cell; 3. Movable mechanism; 31. Rolling element; 32. Base; 4. Isolation pad; 5. Bearing component; 51. Bearing plate; 52. Protective ring; 6. Buffer component; 1000. Vehicle; 100. Battery unit; 200. Controller; 300. Motor. Detailed Implementation

[0064] The embodiments of the technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solutions of the embodiments of this disclosure, and are therefore merely examples and should not be used to limit the scope of protection of this disclosure.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of this disclosure belong; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having” and any variations thereof in embodiments of this disclosure are intended to cover non-exclusive inclusion.

[0066] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "multiple" means two or more, unless otherwise explicitly defined. "Two or more" here includes the case of two.

[0067] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0068] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0069] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0070] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0071] In related technologies, a battery device includes a housing and battery cell assemblies. The housing includes a base, and the battery cell assembly is connected to the base along a first direction. Along the direction intersecting the first direction, the gap between the battery cell assembly and the housing is small, or even in direct contact with the housing. After the battery device is impacted, the battery cell assembly cannot move relative to the housing along the direction intersecting the first direction. On the one hand, the impact may cause the housing to deform towards the battery cell assembly along the direction intersecting the first direction. The deformation of the housing may compress the battery cell assembly, resulting in damage to the battery cell assembly. On the other hand, after the housing is deformed, the housing contacts the battery cell assembly along the direction intersecting the first direction. The vibration generated by the impact is directly transmitted from the housing to the battery cell assembly, resulting in a large force on the battery cell assembly, which may also lead to damage to the battery cell assembly. Therefore, the battery cell assembly is damaged after the battery device is impacted.

[0072] In this embodiment of the battery device 100, the battery cell assembly 2 is disposed inside the housing 1. When the battery device 100 is configured to be subjected to external forces, the battery cell assembly 2 can move relative to the base 13. The battery cell assembly 2 can move within the housing 1 in a direction intersecting with a first direction. The resistance during the movement of the battery cell assembly 2 can consume the collision force, reduce the collision force on the battery cell assembly 2, and reduce the possibility of damage to the battery cell assembly 2 after a collision with the battery device 100. The battery cell assembly 2 can move to avoid the position where the housing 1 deforms in a direction intersecting with the first direction, reduce the possibility of damage to the battery cell assembly 2 caused by the housing 1 squeezing the battery cell assembly 2, and reduce the possibility of damage to the battery cell assembly 2 after a collision with the battery device 100.

[0073] This disclosure provides an electrical device including a battery device 100, which is used to store or provide electrical energy.

[0074] In some embodiments, please refer to Figure 1 The electrical device also includes a main body, and a battery device 100 is installed on the main body to supply power to the main body.

[0075] Electrical devices are devices that use electrical energy as their energy source to perform corresponding functions by consuming electrical energy. For example, electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0076] The main body of a device refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, an electrical device can be a mobile phone, where the main body is the part that enables communication and other functions, powered by individual battery cells or battery packs. Similarly, an electrical device can be a car, where the main body is the part that provides seating and allows the vehicle to move on the road, powered by individual battery cells or battery packs.

[0077] The following description will be based on an example of an electrical device, namely a vehicle 1000, according to an embodiment of this disclosure.

[0078] The vehicle 1000 provided in this embodiment can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Please refer to... Figure 1The vehicle 1000 has a battery device 100 installed inside, which can 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 vehicle 1000's operating power source. The vehicle 1000 may also include a controller 200 and a motor 300, whereby the controller 200 can control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0079] In this embodiment of the disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] In some embodiments, the battery device 100 may be a battery pack.

[0081] In some embodiments, the battery device 100 may be an energy storage device.

[0082] The battery device 100 of this disclosure includes a battery cell assembly, which includes battery cells. Electrical energy is stored or supplied through the battery cells.

[0083] The battery device 100 corresponds to one or at least two battery cell assemblies, which are used to provide voltage and capacity. A battery cell assembly may include at least two battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0084] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0085] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0086] 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.

[0087] 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.

[0088] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0089] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0090] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0091] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, the embodiments of this disclosure are not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0092] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0093] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0094] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0095] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0096] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the embodiments of this disclosure are not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0097] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the negative electrode, the surface of the foamed metal may or may not contain a negative electrode active material.

[0098] In some embodiments, the negative electrode may be made of foamed carbon.

[0099] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0100] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0101] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0102] In some embodiments, the separator is a separator membrane. This disclosure does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0103] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0104] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0105] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0106] Liquid electrolytes include electrolyte salts and solvents.

[0107] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0108] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0109] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0110] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0111] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0112] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0113] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0114] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0115] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0116] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0117] In some implementations, the electrode assembly is a stacked structure.

[0118] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0119] 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.

[0120] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0121] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0122] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0123] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0124] 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.

[0125] 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.

[0126] For the battery device 100 of this disclosure embodiment, please refer to [link to relevant documentation]. Figures 2-10The battery device 100 includes a housing 1 and a battery cell assembly 2. The housing 1 includes a base 13. The battery cell assembly 2 includes a battery cell 21. The battery cell assembly 2 is disposed inside the housing 1. When the battery device 100 is configured to be subjected to external forces, the battery cell assembly 2 can move relative to the base 13. The base 13 is used to support the battery cell assembly 2. The arrangement direction of the base 13 and the battery cell assembly 2 is a first direction. The direction in which the battery cell assembly 2 moves relative to the housing 1 intersects with the first direction.

[0127] It should be noted that the direction in which the battery cell assembly 2 moves relative to the housing 1 intersects with the first direction means that the direction in which the battery cell assembly 2 moves relative to the housing 1 is not parallel to the first direction.

[0128] For example, the housing 1 further includes a first housing 11 and a second housing 12, with a base 13 located within the space enclosed by the first housing 11 and the second housing 12. The first housing 11 and the second housing 12 are fastened together, forming a closed space inside the housing 1 to house the battery cell assembly 2. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 can be a top cover or a bottom plate.

[0129] For example, the base 13 is connected to the second housing 12.

[0130] For example, the first direction is parallel to the vertical direction.

[0131] For example, the second direction intersects with the first direction.

[0132] For example, the third direction intersects with the second direction and the first direction, respectively.

[0133] For example, the direction in which the battery cell assembly 2 moves relative to the housing 1 is perpendicular to the first direction.

[0134] For example, the battery cell assembly 2 includes at least two battery cells 21.

[0135] For example, at least two battery cells 21 of the battery cell assembly 2 are arranged along a third direction.

[0136] For example, at least two battery cell assemblies 2 are arranged along a second direction.

[0137] In this embodiment, the battery cell assembly 2 is disposed within the housing 1. When the battery device 100 is configured to be subjected to external forces, the battery cell assembly 2 can move relative to the base 13, which supports the battery cell assembly 2. The direction in which the battery cell assembly 2 moves relative to the housing 1 intersects with a first direction. After the battery device 100 is impacted, the battery cell assembly 2 can move within the housing 1. The resistance during the movement of the battery cell assembly 2 can dissipate the impact energy, reducing the impact vibration experienced by the battery cell assembly 2 and reducing the possibility of damage to the battery cell assembly 2 after the impact of the battery device 100. Since the battery cell assembly 2 is disposed within the housing 1 and can move relative to the base 13, if the housing 1 deforms in a direction intersecting with the first direction after an impact, the battery cell assembly 2 can move to avoid the deformed position of the housing 1, reducing the possibility of damage to the battery cell assembly 2 caused by the housing 1 squeezing it, and further reducing the possibility of damage to the battery cell assembly 2 after the impact of the battery device 100. After a collision, the likelihood of damage to the battery cell assembly 2 is reduced. If the base 13 is deformed, the base 13 can be replaced separately, and the battery cell assembly 2 can continue to be used, thereby reducing the maintenance cost of the battery device 100.

[0138] For ease of explanation, the first direction is the direction shown by arrow R1 in the figure, the second direction is the direction shown by arrow R2 in the figure, and the third direction is the direction shown by arrow R3 in the figure.

[0139] In some embodiments, please refer to Figures 3-10 The battery device 100 also includes a movable mechanism 3, which is supported along a first direction on the side of the battery cell assembly 2 facing the base 13 to drive the battery cell assembly 2 to move.

[0140] For example, the active mechanism 3 is supported on the underside of the battery cell assembly 2.

[0141] For example, the active mechanism 3 is at least partially disposed in the battery cell assembly 2.

[0142] For example, the active mechanism 3 is at least partially disposed in the housing 1.

[0143] In this embodiment, the movable mechanism 3 supports the battery cell assembly 2 on the side facing the base 13 along the first direction to drive the battery cell assembly 2 to move. By driving the battery cell assembly 2 to move through the movable mechanism 3, the direct contact between the battery cell assembly 2 and the base 13 is reduced, and the wear of the battery cell assembly 2 during the movement is reduced.

[0144] It is understood that the battery device 100 is not limited to the installation of the active mechanism 3. Exemplarily, the battery cell assembly 2 is in direct contact with the base 13.

[0145] In some embodiments, please refer to Figures 3-10The moving mechanism 3 includes a rolling element 31 disposed on the base 13. The rolling element 31 is configured to be rotatable relative to the base 13 and the rolling element 31 abuts against the battery cell assembly 2, so that when the battery cell assembly 2 moves under external force, the rolling element 31 can be driven to roll relative to the base 13 and the battery cell assembly 2.

[0146] It should be noted that the rolling element 31 abutting against the battery cell assembly 2 means that there is an interaction force between the rolling element 31 and the battery cell assembly 2.

[0147] For example, the rolling element 31 directly contacts the battery cell assembly 2 to achieve abutment.

[0148] For example, the rolling element 31 indirectly contacts the battery cell assembly 2 to achieve abutment.

[0149] For example, during the rolling motion of the rolling element 31 relative to the base 13 and the battery cell assembly 2, the rolling element 31 moves relative to the battery cell assembly 2 in a direction intersecting with the first direction, but the rolling element 31 does not move relative to the base 13.

[0150] For example, during the rolling process of the rolling element 31 relative to the base 13 and the battery cell assembly 2, the rolling element 31 moves relative to the base 13 in a direction intersecting with the first direction, but the rolling element 31 does not move relative to the battery cell assembly 2.

[0151] For example, during the rolling process of the rolling element 31 relative to the base 13 and the battery cell assembly 2, the rolling element 31 moves relative to the base 13 in a direction intersecting with the first direction, and the rolling element 31 moves relative to the battery cell assembly 2 in a direction intersecting with the first direction.

[0152] For example, the rolling element 31 is mounted on the housing 1.

[0153] For example, the rolling element 31 is mounted on the battery cell assembly 2.

[0154] For example, the rolling element 31 is a rolling ball.

[0155] For example, the rolling element 31 is a roller.

[0156] For example, the rolling element 31 is a roller.

[0157] For example, the rolling element 31 is directly disposed on the base 13.

[0158] For example, the rolling element 31 is indirectly disposed on the base 13.

[0159] For example, the rolling element 31 abuts against the battery cell assembly 2 along the first direction.

[0160] In this embodiment of the disclosure, the rolling element 31 abuts against the battery cell assembly 2. When the battery cell assembly 2 moves under the influence of external forces, it can drive the rolling element 31 to roll relative to the base 13 and the battery cell assembly 2. The rolling element 31 consumes collision energy, reduces the collision force on the battery cell assembly 2, and reduces the possibility of damage to the battery cell assembly 2 after a collision with the battery device 100.

[0161] It is understood that the moving mechanism 3 is not limited to including the rolling element 31. Exemplarily, the moving mechanism 3 is a sliding mechanism.

[0162] For example, the moving mechanism 3 includes a slide rail.

[0163] For example, the moving mechanism 3 includes a moving bearing.

[0164] In some embodiments, please refer to Figures 3-10 The battery device 100 also includes a base 32, with a rolling element 31 located inside the base 32. The base 32 is connected to the housing 1. When the battery device 100 is subjected to external forces, the battery cell assembly 2 moves to drive the rolling element 31 to roll inside the base 32.

[0165] It should be noted that the rolling direction of the rolling element 31 is not restricted.

[0166] For example, the base 32 is connected to the base 13.

[0167] For example, the base 32 is welded to the base 13.

[0168] For example, the base 32 contains at least one rolling element 31.

[0169] For example, the number of rolling elements 31 is one, four, fifteen, twenty-four, or thirty.

[0170] For example, the rolling element 31 is able to roll within the base 32 without moving relative to the base 32.

[0171] For example, the rolling element 31 is capable of rolling within the base 32, and the rolling element 31 is capable of moving within the base 32.

[0172] In this embodiment, the rolling element 31 is located inside the base 32, which is connected to the housing 1. The battery cell assembly 2 moves when the battery device 100 is subjected to external forces, thereby driving the rolling element 31 to roll inside the base 32. The rolling element 31 does not need to be connected to the cell assembly or the housing 1, and the structure is relatively simple and the rolling element 31 is easy to install.

[0173] It is understood that the battery device 100 is not limited to including the base 32. Exemplarily, the rolling element 31 is a roller, and the battery device 100 includes a roller disposed on the base 13 or the battery cell assembly 2, and the rolling element 31 is rotatably disposed on the roller.

[0174] For example, the moving mechanism is a swivel wheel.

[0175] For example, the moving mechanism is a one-way wheel.

[0176] In some embodiments, please refer to Figures 3-10 The base 13 has a mounting groove 131, the base 32 is at least partially located in the mounting groove 131, and the rolling element 31 protrudes from the base 13 in a first direction toward the side of the battery cell assembly 2.

[0177] For example, the base 32 is partially located inside the mounting groove 131 and partially located outside the mounting groove 131.

[0178] For example, the base 32 is entirely located within the mounting slot 131.

[0179] For example, the rolling element 31 protrudes along the first direction from the base 32 toward the side facing the battery cell assembly 2.

[0180] For example, the base 32 abuts against the wall of the mounting groove 131 along the second direction.

[0181] For example, the base 32 abuts against the wall of the mounting groove 131 in a third direction.

[0182] In this embodiment, the base 32 is at least partially located within the mounting groove 131, and the rolling element 31 is located within the base 32. The rolling element 31 protrudes from the side of the base 13 facing the battery cell assembly 2 along a first direction. The base 32 and the rolling element 31 are arranged using the space of the base 13 along the first direction, reducing the space occupied by the rolling element 31 and the base 32 in the battery device 100 along the first direction. The mounting groove 131 can restrict the movement of the base 32 along the direction intersecting the first direction, reducing the swaying of the base 32 within the housing 1. The rolling element 31 protrudes from the side of the base 13 facing the battery cell assembly 2 along the first direction, ensuring that the side of the battery cell assembly 2 facing the base 13 is preferentially spaced from the base 13, reducing wear caused by contact between the battery cell assembly 2 and the base 13.

[0183] It is understood that the base 32 is not limited to being at least partially located within the mounting slot 131. Exemplarily, the base 32 is located above the base 13.

[0184] In some embodiments, please refer to Figures 3-10The battery device 100 also includes a separator 4, which is connected to the side of the base 13 facing the battery cell assembly 2 along the first direction. On the same projection plane perpendicular to the first direction, the projection area of ​​the separator 4 and the projection area of ​​the base 32 are offset. The rolling element 31 protrudes from the side of the separator 4 facing the battery cell assembly 2 along the first direction.

[0185] For example, the isolation pad 4 is a flexible pad, and the isolation pad 4 is elastic.

[0186] For example, the base 13 is made of metal.

[0187] For example, the isolation pad 4 is bonded to the base 13.

[0188] In this embodiment, the isolation pad 4 is connected to the side of the base 13 facing the battery cell assembly 2 along the first direction. On the same projection plane perpendicular to the first direction, the projection area of ​​the isolation pad 4 and the projection area of ​​the base 32 are offset. The rolling element 31 protrudes from the side of the isolation pad 4 facing the battery cell assembly 2 along the first direction. The isolation pad 4 will not interfere with the rolling element 31 rolling in the base 32. The isolation pad 4 isolates the area of ​​the base 13 and the battery cell assembly 2 that is not in contact with the rolling element 31. In the case of deformation of the base 13, the battery cell assembly 2 will not directly contact the base 13, reducing abnormal noise and wear caused by contact between the base 13 and the battery cell assembly 2.

[0189] It is understandable that the battery device 100 may not have an isolation pad 4.

[0190] It is understood that the rolling element 31 is not limited to protruding from the side of the separator 4 toward the battery cell assembly 2 in the first direction. Exemplarily, the rolling element 31 is flush with the separator 4 toward the battery cell assembly 2 in the first direction.

[0191] In some embodiments, please refer to Figure 9 The maximum distance by which the rolling element 31 protrudes from the isolation pad 4 toward the battery cell assembly 2 along the first direction is the first distance, which is greater than or equal to 1 mm.

[0192] The first distance can be obtained by measuring with a vernier caliper or ruler under normal temperature and pressure conditions when the battery cell 21 is de-energized and not in operation.

[0193] The first distance is shown as dimension D1 in the figure.

[0194] It should be noted that mm stands for millimeter.

[0195] For example, the first distance is 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.8 mm or 2 mm.

[0196] In this embodiment of the disclosure, the maximum distance by which the rolling element 31 protrudes from the side of the isolation pad 4 toward the battery cell assembly 2 along the first direction is the first distance. The first distance is greater than or equal to 1 mm. The first distance is within a suitable range, which can reduce the possibility of contact between the battery cell assembly 2 and the isolation pad 4 of the base 13, and make the size of the battery device 100 along the first direction more suitable.

[0197] It is understood that the first distance is not limited to being greater than or equal to 1 mm. For example, the first distance is less than 1 mm.

[0198] In some embodiments, please refer to Figures 3-7 The battery device 100 also includes a carrier 5 that contacts the rolling element 31. The movable mechanism 3 is supported on the side of the carrier 5 facing the base 13 along the first direction. The battery cell assembly 2 is located on the side of the carrier 5 away from the movable mechanism 3 along the first direction. The base 13 carries the battery cell assembly 2 through the carrier 5. The carrier 5 is arranged at intervals with the isolation pad 4 along the first direction.

[0199] For example, the carrier 5 is spaced apart from the base 32 along the first direction.

[0200] In this embodiment, the movable mechanism 3 is supported along the first direction on the side of the carrier 5 facing the base 13. The battery cell assembly 2 is located on the side of the carrier 5 away from the movable mechanism 3 along the first direction. The base 13 carries the battery cell assembly 2 through the carrier 5. The movable mechanism 3 drives the carrier 5 to move, thereby driving the battery cell assembly 2 to move. The carrier 5 protects the battery cell assembly 2, reducing the possibility of damage to the battery cell assembly 2. The battery cell assembly 2 does not directly contact the movable mechanism 3, and the force on the battery cell assembly 2 is more even. The carrier 5 is spaced apart from the isolation pad 4 along the first direction, reducing wear between the carrier 5 and the isolation pad 4. In the event of deformation of the base 13, the possibility of the carrier 5 being lifted off the rolling element 31 by the isolation pad 4 is reduced.

[0201] It is understood that the carrier 5 is not limited to being arranged at a distance from the isolation pad 4 along the first direction. Exemplarily, the carrier 5 is in contact with the isolation pad 4 along the first direction.

[0202] In some embodiments, please refer to Figures 3-7 The battery cell assembly 2 has rolling elements 31 on opposite sides along the second direction, and the second direction intersects with the first direction.

[0203] It should be noted that the intersection of the second direction and the first direction means that the first direction and the second direction are not parallel.

[0204] For example, the second direction is perpendicular to the first direction.

[0205] In this embodiment of the present disclosure, rolling elements 31 are respectively provided on opposite sides of the battery cell assembly 2 along the second direction. Both sides of the battery cell assembly 2 along the second direction can be supported by the rolling elements 31, which improves the uniformity of force on the battery cell assembly 2 along the second direction and makes the battery cell assembly 2 move more smoothly.

[0206] It is understood that the battery cell assembly 2 is not limited to having rolling elements 31 respectively on opposite sides along the second direction. For example, the battery cell assembly 2 has rolling elements 31 on one side along the second direction.

[0207] In some embodiments, the number of rolling elements 31 is at least two, and the at least two rolling elements 31 are spaced apart along a third direction, which intersects with the first direction.

[0208] It should be noted that the intersection of the third direction and the first direction means that the first direction and the third direction are not parallel.

[0209] It should be noted that the third direction intersects with the first and second directions respectively.

[0210] For example, the third direction is perpendicular to the first direction.

[0211] For example, the third direction is perpendicular to the second direction.

[0212] For example, the number of rolling elements 31 can be two, ten, eighteen, thirty, or sixty.

[0213] For example, the number of bases 32 may be two, four, six, eight, or ten.

[0214] For example, the number of rolling elements 31 in each base 32 is one, three, nine, fifteen or eighteen.

[0215] In this embodiment of the present disclosure, at least two rolling elements 31 are spaced apart along a third direction, and the battery cell assembly 2 can be supported by the rolling elements 31 on both sides along the third direction, thereby improving the uniformity of force on the battery cell assembly 2 along the third direction and making the battery cell assembly 2 move more smoothly.

[0216] It is understood that at least two rolling elements 31 are not limited to being spaced apart along a third direction. Exemplarily, the battery cell assembly 2 has one rolling element 31 arranged along a third direction.

[0217] In some embodiments, please refer to Figures 3-7 The battery device 100 also includes a support member 5, a battery cell assembly 2 connected to the support member 5 on the side away from the base 13 along the first direction, and an actuating mechanism 3 supported on the side of the support member 5 facing the base 13 along the first direction. The actuating mechanism 3 is disposed on the support member 5 and / or the housing 1.

[0218] For example, the active mechanism 3 is disposed on the support member 5.

[0219] For example, the active mechanism 3 is disposed in the housing 1.

[0220] For example, the rolling element 31 is disposed on the carrier 5 and / or the housing 1.

[0221] For example, the rolling element 31 abuts against the carrier 5.

[0222] In this embodiment, the battery cell assembly 2 is connected to the side of the support member 5 away from the base 13 along the first direction, and the movable mechanism 3 is supported on the side of the support member 5 facing the base 13 along the first direction. The movable mechanism 3 is disposed on the support member 5 and / or the housing 1. The movable mechanism 3 drives the support member 5 to move, thereby driving the battery cell assembly 2 to move. The support member 5 protects the battery cell assembly 2 and reduces the possibility of damage to the battery cell assembly 2. The battery cell assembly 2 does not directly contact the movable mechanism 3, and the battery cell assembly 2 is subjected to more uniform force.

[0223] It is understood that the battery device 100 is not limited to having a support member 5. Exemplarily, the movable mechanism 3 is connected to the battery cell assembly 2.

[0224] In some embodiments, please refer to Figures 3-7 The battery device 100 also includes a support member 5, which is movably disposed on the housing 1. The battery cell assembly 2 is connected to the support member 5, and the base 13 supports the battery cell assembly 2 through the support member 5.

[0225] For example, the battery cell assembly 2 is bonded to the carrier 5.

[0226] It should be noted that the movable arrangement of the support member 5 in the housing 1 means that the support member 5 is located inside the housing 1 and can move relative to the base 13.

[0227] In this embodiment, the carrier 5 is movably disposed on the housing 1, the battery cell assembly 2 is connected to the carrier 5, the base 13 supports the battery cell assembly 2 through the carrier 5, and the carrier 5 drives the battery cell assembly 2 to move relative to the housing 1. The carrier 5 isolates the battery cell assembly 2 from the base 13 and protects the battery cell assembly 2. The carrier 5 and the battery cell assembly 2 are subjected to force as a whole, which improves the structural strength of the battery device 100 and facilitates the installation of the battery cell assembly 2 and the carrier 5 as a whole module.

[0228] It is understandable that the battery device 100 may not have a support member 5.

[0229] In some embodiments, please refer to Figures 3-7The carrier 5 includes a protective ring 52 and a carrier plate 51 that are connected to each other. The protective ring 52 surrounds the battery cell assembly 2, and the carrier plate 51 is located on the side of the battery cell assembly 2 facing the base 13 in a first direction. The battery cell assembly 2 is connected to the protective ring 52 and / or the carrier plate 51.

[0230] For example, the carrier 5 is a one-piece molded component.

[0231] For example, the carrier 5 is an integral stamped part.

[0232] For example, the support member 5 is made of metal.

[0233] For example, the support member 5 is a sheet metal part.

[0234] For example, the protective ring 52 and the carrier plate 51 are welded together.

[0235] For example, the battery cell assembly 2 is connected to the protective ring 52.

[0236] For example, the battery cell assembly 2 is connected to the carrier plate 51.

[0237] For example, the battery cell assembly 2 is connected to the protective ring 52 and the carrier plate 51.

[0238] In this embodiment, a protective ring 52 surrounds the battery cell assembly 2, and a support plate 51 is located on the side of the battery cell assembly 2 facing the base 13 along the first direction. The battery cell assembly 2 is connected to the protective ring 52 and / or the support plate 51. The protective ring 52 protects the battery cell assembly 2 from its surroundings, and the support plate 51 protects the battery cell assembly 2 from the side of the battery cell assembly 2 facing the base 13 along the first direction. This improves the protection of the battery cell assembly 2 by the support member 5 and reduces contact damage and abnormal noise between the battery cell assembly 2 and the base 13.

[0239] It is understood that the carrier 5 is not limited to including the interconnected protective ring 52 and the carrier plate 51. Exemplarily, the carrier 5 only includes the carrier plate 51 located on the side of the battery cell assembly 2 facing the base 13 along the first direction.

[0240] In some embodiments, the carrier 5 includes a weight-reducing hole, which is a blind hole or a through hole.

[0241] For example, the weight reduction hole is spaced from the base 13 along the second direction.

[0242] For example, the weight reduction hole is spaced from the base 13 along a third direction.

[0243] For example, the weight reduction hole is spaced apart from the movable mechanism 3 along the second direction.

[0244] For example, the weight reduction hole is spaced apart from the active mechanism 3 along a third direction.

[0245] For example, weight reduction holes are formed in the support plate 51.

[0246] For example, the number of weight-reducing holes is at least one.

[0247] For example, at least two weight reduction holes are spaced apart.

[0248] In this embodiment of the present disclosure, the support member 5 includes a weight reduction hole, which can be a blind hole or a through hole. The support member 5 can be provided with a weight reduction hole as needed, so as to reduce the weight of the support member 5 while satisfying the structural strength of the support member 5, thereby reducing the weight of the battery device 100.

[0249] It is understandable that the load-bearing component 5 may not have weight-reduction holes.

[0250] In some embodiments, please refer to Figures 3-10 The base 13 includes at least two crossbeams 132, which are spaced apart along a second direction that intersects with the first direction. The at least two crossbeams 132 are used to support the battery cell assembly 2.

[0251] It should be noted that the intersection of the second direction and the first direction means that the first direction and the second direction are not parallel.

[0252] For example, the weight reduction holes are spaced apart from the crossbeam 132 along the second direction.

[0253] For example, at least two crossbeams 132 are used to support the support member 5.

[0254] For example, the crossbeam 132 contacts the bearing plate 51 along the first direction.

[0255] For example, each crossbeam 132 is provided with a rolling element 31.

[0256] For example, each crossbeam 132 is provided with a base 32.

[0257] For example, mounting groove 131 is formed in crossbeam 132.

[0258] For example, the number of crossbeams 132 may be two, three, or four.

[0259] For example, the base 32 is welded to the crossbeam 132.

[0260] In this embodiment, at least two crossbeams 132 are arranged at intervals along a second direction. These two crossbeams 132 support the battery cell assembly 2. The at least two spaced-apart crossbeams 132 provide at least two support positions for the battery cell assembly 2 along the second direction, resulting in more stable support for the battery cell assembly 2. With the spaced-apart crossbeams 132 meeting the requirements for supporting the battery cell assembly 2, the at least two spaced-apart crossbeams 132 reduce the weight of the base 13, thereby reducing the weight of the battery device 100. Furthermore, the at least two spaced-apart crossbeams 132 allow a portion of the battery cell assembly 2 along the first direction facing the crossbeams 132 to be suspended, reducing the transmission of vibration from the crossbeams 132 to the battery cell assembly 2.

[0261] It is understood that at least two crossbeams 132 are not limited to being spaced apart along the second direction. Exemplarily, at least two crossbeams 132 are in contact along the second direction.

[0262] In some embodiments, please refer to Figures 2-10 The housing 1 includes a enclosure 14 connected to the base 13, the enclosure 14 surrounds the base 13, and the battery cell assembly 2 moves within the area enclosed by the enclosure 14.

[0263] For example, the base 13 is welded to the enclosure 14.

[0264] For example, the base 13 is bolted to the enclosure 14.

[0265] For example, the base 13 is riveted to the enclosure 14.

[0266] For example, the material of the enclosure 14 is extruded profile or roll-formed steel.

[0267] For example, the enclosure 14 is formed by welding stamped parts.

[0268] For example, the carrier 5 moves within the area enclosed by the enclosure 14.

[0269] For example, the enclosure 14 is bolted to the second housing 12.

[0270] In this embodiment of the disclosure, the enclosure 14 surrounds the base 13, and the battery cell assembly 2 moves within the area enclosed by the enclosure 14. The enclosure 14 can support and fix the battery cell assembly 2 from the surroundings, thus protecting the battery cell assembly 2.

[0271] It is understandable that the enclosure 1 may not be provided with a wall 14 connected to the base 13.

[0272] In some embodiments, please refer to Figures 3-7The battery device 100 also includes a support member 5, which is movably disposed on the housing 1. The battery cell assembly 2 is connected to the support member 5, and the base 13 supports the battery cell assembly 2 through the support member 5. When the battery cell assembly 2 is in a preset position, the support member 5 and the enclosure 14 are arranged at intervals.

[0273] It should be noted that the spaced arrangement between the support member 5 and the enclosure 14 means that when the battery cell assembly 2 is in the preset position, all positions on the support member 5 are spaced apart from the enclosure 14, and the support member 5 can move relatively freely within the housing 1.

[0274] For example, the support member 5 is spaced from the enclosure wall 14 on both sides along the second direction, and the support member 5 is spaced from the enclosure wall 14 on both sides along the third direction.

[0275] In this embodiment of the present disclosure, when the battery cell assembly 2 is in a preset position, the support member 5 is arranged at intervals with the enclosure 14, so that the support member 5 can drive the battery cell assembly 2 to move in multiple directions intersecting with the first direction, thereby buffering the collision impact from multiple directions, reducing the collision force directly transmitted to the support member 5, reducing the vibration transmitted to the battery cell assembly 2, and reducing the possibility of damage to the battery cell assembly 2 after the battery device 100 collides.

[0276] It is understood that when the battery cell assembly 2 is in a preset position, the carrier 5 is not limited to being spaced apart from the enclosure 14. Exemplarily, the carrier 5 is spaced apart from the enclosure 14 along a second direction, and the carrier 5 is in contact with the enclosure 14 along a third direction.

[0277] In some embodiments, please refer to Figures 2-10 The battery device 100 also includes a buffer 6, which is connected to the inside of the enclosure 14.

[0278] For example, the buffer 6 is an elastic pad that can elastically deform to cushion vibrations.

[0279] For example, the material of the buffer 6 is silicone, ethylene propylene rubber or polyurethane foam.

[0280] For example, the buffer 6 is a rubber pad.

[0281] For example, the support member 5 is provided with buffer members 6 on both sides of the opposite sides along the second direction.

[0282] For example, the support member 5 is provided with buffer members 6 on both opposite sides along the third direction.

[0283] For example, the buffer 6 is bonded to the enclosure 14.

[0284] For example, the thickness of the buffer 6 is greater than or equal to 3 mm.

[0285] In this embodiment, the buffer 6 is connected to the inner side of the enclosure 14. After the battery device 100 collides, the buffer 6 can absorb the vibration energy between the battery cell assembly 2 and the enclosure 14, reducing the vibration transmitted to the battery cell assembly 2. The buffer 6 can limit the contact between the battery cell assembly 2 and the enclosure 14 during movement, reducing abnormal noise caused by the contact between the battery cell assembly 2 and the enclosure 14. The buffer deforms under stress, increasing the contact area between the battery cell assembly or the load-bearing component and the buffer, which helps to convert point loads into surface loads, significantly reducing contact stress and reducing the situation of excessive local stress.

[0286] It is understandable that the battery device 100 may not have a buffer 6.

[0287] In some embodiments, please refer to Figures 3-7 The battery device 100 also includes a carrier 5, which is movably disposed on the housing 1. The battery cell assembly 2 is connected to the carrier 5. The base 13 supports the battery cell assembly 2 through the carrier 5. The carrier 5 is spaced from the buffer 6 on at least one side along the second direction and / or the third direction. The second direction intersects the first direction, and the third direction intersects the first direction and the second direction respectively.

[0288] For example, the carrier 5 is spaced apart from the buffer 6 on at least one side along the second direction.

[0289] For example, the carrier 5 is spaced apart from the buffer 6 on at least one side along a third direction.

[0290] For example, the carrier 5 is spaced apart from the buffer 6 on both sides along the second direction.

[0291] For example, the carrier 5 is spaced apart from the buffer 6 on both sides along the third direction.

[0292] In this embodiment, the carrier 5 is spaced apart from the buffer 6 on at least one side along the second and / or third directions, providing ample space within the enclosure 14 along the second and / or third directions for the carrier 5 to move the battery cell assembly 2. This facilitates the dissipation of collision energy during movement of the carrier 5 and the battery cell assembly 2, reducing the risk of collision damage to the battery cell assembly 2 after the battery device 100 is assembled. The buffer 6, upon compression after a collision, absorbs a significant amount of collision energy, reducing the likelihood of the battery cell assembly 2 rebounding and impacting the housing 1 again, thus preventing the wiring harnesses or copper busbars on the battery device from being broken and reducing maintenance costs.

[0293] It is understood that the carrier 5 is not limited to being spaced from the buffer 6 on at least one side along the second direction and / or the third direction. Exemplarily, the carrier 5 contacts the buffer 6 on opposite sides along the second direction and the third direction, respectively, and the carrier 5 is capable of compressing the buffer 6 along the second direction and the third direction to achieve movement relative to the housing 1.

[0294] For example, the carrier 5 and the buffer 6 are interference fit.

[0295] In some embodiments, please refer to Figure 6 Along the second direction, when one side of the bearing member 5 is in contact with the buffer member 6, the minimum distance between the other side of the bearing member 5 and the enclosure wall 14 is the second distance, which is 5mm to 15mm.

[0296] The second distance can be obtained by measuring with a vernier caliper or ruler under normal temperature and pressure conditions when the battery cell 21 is de-energized and not in operation.

[0297] The second distance is shown as dimension D2 in the figure.

[0298] It should be noted that the situation where the carrier 5 contacts the buffer 6 on one side along the second direction refers to the situation where the carrier 5 contacts the buffer 6 on one side along the second direction but the carrier 5 does not compress the buffer 6.

[0299] For example, the second direction is perpendicular to the first direction.

[0300] For example, the thickness of the buffer 6 is less than 5 mm.

[0301] For example, the second distance is 5mm, 8mm, 10mm, 12mm, 13mm, 14mm or 15mm.

[0302] In this embodiment of the disclosure, when one side of the carrier 5 is in contact with the buffer 6 along the second direction, the minimum distance between the other side of the carrier 5 and the enclosure 14 is the second distance, which is 5mm to 15mm. The second distance is within a suitable range, which can meet the requirement that the carrier 5 drives the battery cell assembly 2 to move along the second direction to consume collision energy, and also ensure that the size of the battery device 100 along the second direction is within a suitable range, taking into account the volumetric energy density requirement of the battery device 100.

[0303] Understandably, the second distance is not limited to 5mm~15mm.

[0304] For example, the second distance is less than 5 mm.

[0305] For example, the second distance is greater than 15mm.

[0306] In some embodiments, please refer to Figure 4 and Figure 5 Along the third direction, when one side of the bearing member 5 is in contact with the buffer member 6, the minimum distance between the other side of the bearing member 5 and the enclosure 14 is the third distance, which is 5mm to 15mm.

[0307] The third distance can be obtained by measuring with a vernier caliper or ruler under normal temperature and pressure conditions when the battery cell 21 is not powered on and not in operation.

[0308] It should be noted that the situation where the carrier 5 contacts the buffer 6 on one side along the third direction refers to the situation where the carrier 5 contacts the buffer 6 along the third direction but the carrier 5 does not compress the buffer 6.

[0309] The third distance is shown as dimension D3 in the figure.

[0310] For example, the third direction is perpendicular to the second direction.

[0311] For example, the third direction is perpendicular to the first direction.

[0312] For example, the third distance is 5mm, 8mm, 10mm, 12mm, 13mm, 14mm or 15mm.

[0313] In this embodiment of the disclosure, when one side of the carrier 5 is in contact with the buffer 6 along the third direction, the minimum distance between the other side of the carrier 5 and the enclosure 14 is the third distance, which is 5mm to 15mm. The third distance is within a suitable range, which can meet the requirement that the carrier 5 drives the battery cell assembly 2 to move along the third direction to consume collision energy, and also ensure that the size of the battery device 100 along the third direction is within a suitable range, taking into account the volumetric energy density requirement of the battery device 100.

[0314] Understandably, the third distance is not limited to 5mm~15mm.

[0315] For example, the third distance is less than 5mm.

[0316] For example, the third distance is greater than 15mm.

[0317] In some implementations, please refer to Figures 2-10The battery cell assembly 2 is disposed within the housing 1. When the battery device 100 is configured to be subjected to external forces, the battery cell assembly 2 can move relative to the base 13. The base 13 supports the battery cell assembly 2, and the arrangement direction of the base 13 and the battery cell assembly 2 is a first direction. The direction in which the battery cell assembly 2 moves relative to the housing 1 intersects with the first direction. A movable mechanism 3 is supported along the first direction on the side of the battery cell assembly 2 facing the base 13 to drive the battery cell assembly 2 to move. The movable mechanism 3 includes a rolling element 31 disposed on the base 13. The rolling element 31 is configured to be rotatable relative to the base 13, and the rolling element 31 abuts against the battery cell assembly 2, so that when the battery device 100 moves under external forces, the rolling element 31 can be driven to roll relative to the base 13 and the battery cell assembly 2. The rolling element 31 is located within a base 32, which is connected to the housing 1. When the battery device 100 is subjected to external forces, the movement of the battery cell assembly 2 drives the rolling element 31 to roll within the base 32. The base 32 is at least partially located within the mounting groove 131. The rolling element 31 protrudes from the base 13 along a first direction towards the side facing the battery cell assembly 2. An isolation pad 4 is connected to the base 13 along the first direction towards the battery cell assembly 2. On the same projection plane perpendicular to the first direction, the projection area of ​​the isolation pad 4 and the projection area of ​​the base 32 are offset. The rolling element 31 protrudes from the isolation pad 4 along the first direction towards the side facing the battery cell assembly 2. The maximum distance by which the rolling element 31 protrudes from the isolation pad 4 along the first direction towards the side facing the battery cell assembly 2 is a first distance, which is greater than or equal to 1 mm. The rolling element 31 is supported along the first direction on the side of the support member 5 facing the base 13. The battery cell assembly 2 is located on the side of the support member 5 opposite to the rolling element 31 along the first direction. The base 13 supports the battery cell assembly 2 via the support member 5, which is spaced apart from the isolation pad 4 along the first direction. The support member 5 is movably mounted on the housing 1, and the battery cell assembly 2 is connected to the support member 5. Rolling elements 31 are respectively provided on opposite sides of the battery cell assembly 2 along a second direction, which intersects with the first direction. There are at least two rolling elements 31, spaced apart along a third direction, which intersects with both the first and second directions. The rolling elements 31 are disposed in the housing 1. A protective ring 52 surrounds the battery cell assembly 2. A support plate 51 is located on the side of the battery cell assembly 2 facing the base 13 along the first direction. The battery cell assembly 2 is connected to the protective ring 52 and / or the support plate 51. The support member 5 includes weight-reducing holes, which are through holes. At least two crossbeams 132 are arranged spaced apart along a second direction, which intersects with the first direction, and these crossbeams 132 are used to support the battery cell assembly 2. A surrounding wall 14 surrounds the base 13, and the battery cell assembly 2 moves within the area enclosed by the surrounding wall 14. When the battery cell assembly 2 is in a preset position, the support member 5 is spaced apart from the surrounding wall 14. A buffer member 6 is connected to the inner side of the surrounding wall 14.The support member 5 is spaced apart from the buffer member 6 on opposite sides along the second and third directions. Along the second direction, when one side of the support member 5 is in contact with the buffer member 6, the minimum distance between the other side of the support member 5 and the enclosure wall 14 is the second distance, which is 5mm to 15mm. Along the third direction, when one side of the support member 5 is in contact with the buffer member 6, the minimum distance between the other side of the support member 5 and the enclosure wall 14 is the third distance, which is 5mm to 15mm.

[0318] For example, the impact energy dissipated by the movement of a single battery cell assembly is approximately the same as the impact energy absorbed by a 1kg aluminum energy-absorbing box placed on the battery device. kg represents kilograms.

[0319] In some embodiments, after the battery device 100 is impacted, the peak acceleration of the battery cell assembly 2 decreases by more than 30%, the peak acceleration of the battery cell assembly 2 drops significantly, and the indentation on the outer shell of the battery cell 21 is less than 0.1 mm, which meets the "no deformation" criterion for compression in the "Safety Requirements for Power Batteries for Electric Vehicles" (GB38031-2025).

[0320] In some embodiments, compared to the case where the buffer 6 is not provided, providing the buffer 6 reduces the amount of inward deformation of the base after the collision, reduces the peak contact stress between the bearing 5 and the box 1 by more than 50%, and the box 1 will basically not develop indentation cracks.

[0321] In some embodiments, buffers 6 are disposed on opposite sides of the battery cell assembly 2 in the second and third directions, so that abnormal noise sources in the 1kHz~3kHz frequency band disappear directly during vehicle NVH (Noise-Vibration-Harshness) testing, and zero abnormal noise is observed during 5000km of vehicle road testing. kHz represents kilohertz.

[0322] The above embodiments are merely illustrative of the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A battery device, characterized in that, include: The enclosure, including the base; A battery cell assembly includes battery cells disposed within a housing. The battery device is configured such that, when subjected to external forces, the battery cell assembly is movable relative to a base, the base supporting the battery cell assembly. The arrangement direction of the base and the battery cell assembly is a first direction, and the direction in which the battery cell assembly moves relative to the housing intersects the first direction. The battery device further includes a movable mechanism supported along the first direction on the side of the battery cell assembly facing the base to drive the battery cell assembly to move. The active mechanism includes a rolling element disposed on the base. The rolling element is configured to be rotatable relative to the base and abuts against the battery cell assembly, such that when the battery cell assembly moves under external force, it can drive the rolling element to roll relative to the base and the battery cell assembly. The rolling direction of the rolling element is unrestricted, and the rolling element is a ball. As the rolling element rolls relative to the base and the battery cell assembly, the rolling element moves relative to the base in a direction intersecting the first direction, and the rolling element moves relative to the battery cell assembly in a direction intersecting the first direction. The battery device also includes a base, the rolling element is located inside the base, the base is connected to the housing, the number of the rolling elements is at least two, and the base contains at least two of the rolling elements.

2. The battery device according to claim 1, characterized in that, The base has a mounting groove, the base being at least partially located within the mounting groove, and the rolling element protruding along the first direction from the side of the base facing the battery cell assembly.

3. The battery device according to claim 2, characterized in that, The battery device further includes a separator pad connected to the base on one side facing the battery cell assembly along the first direction; On the same projection plane perpendicular to the first direction, the projection area of ​​the isolation pad and the projection area of ​​the base are offset, and the rolling element protrudes from the side of the isolation pad facing the battery cell assembly along the first direction.

4. The battery device according to claim 3, characterized in that, The maximum distance by which the rolling element protrudes from the insulating pad toward the battery cell assembly along the first direction is the first distance, which is greater than or equal to 1 mm.

5. The battery device according to claim 3, characterized in that, The battery device further includes a carrier member in contact with the rolling element, the movable mechanism is supported along the first direction on the side of the carrier member facing the base, the battery cell assembly is located on the side of the carrier member away from the movable mechanism along the first direction, the base carries the battery cell assembly through the carrier member, and the carrier member is arranged at intervals from the isolation pad along the first direction.

6. The battery device according to claim 1, characterized in that, The battery cell assembly has rolling elements disposed on opposite sides along a second direction, which intersects with the first direction; and / or, at least two rolling elements are disposed at intervals along a third direction, which intersects with the first direction.

7. The battery device according to claim 1, characterized in that, The battery device further includes a carrier, the battery cell assembly is connected to the side of the carrier away from the base along the first direction, and the movable mechanism is supported on the side of the carrier facing the base along the first direction. The movable mechanism is disposed on the carrier and / or the housing.

8. The battery device according to any one of claims 1 to 6, characterized in that, The battery device also includes a carrier, which is movably disposed on the housing. The battery cell assembly is connected to the carrier, and the base supports the battery cell assembly through the carrier.

9. The battery device according to claim 8, characterized in that, The support member includes a protective ring and a support plate that are interconnected. The protective ring surrounds the battery cell assembly, and the support plate is located on the side of the battery cell assembly facing the base along the first direction. The battery cell assembly is connected to the protective ring and / or the support plate.

10. The battery device according to claim 8, characterized in that, The support member includes a weight-reducing hole, which is either a blind hole or a through hole.

11. The battery device according to any one of claims 1 to 7, characterized in that, The base includes at least two crossbeams, which are spaced apart along a second direction that intersects with the first direction. The at least two crossbeams are used to support the battery cell assembly.

12. The battery device according to any one of claims 1 to 7, characterized in that, The enclosure includes a wall connected to the base, the wall surrounding the base, and the battery cell assembly moving within the area enclosed by the wall.

13. The battery device according to claim 12, characterized in that, The battery device also includes a support member, which is movably disposed on the housing. The battery cell assembly is connected to the support member, and the base supports the battery cell assembly through the support member. When the battery cell assembly is in a preset position, the support member is spaced apart from the enclosure.

14. The battery device according to claim 12, characterized in that, The battery device also includes a buffer element connected to the inside of the enclosure.

15. The battery device according to claim 14, characterized in that, The battery device further includes a carrier member, which is movably disposed on the housing. The battery cell assembly is connected to the carrier member, and the base supports the battery cell assembly through the carrier member. The carrier member is spaced from the buffer member on at least one side along the second direction and / or the third direction. The second direction intersects the first direction, and the third direction intersects the first direction and the second direction, respectively.

16. The battery device according to claim 15, characterized in that, Along the second direction, when one side of the carrier is in contact with the buffer, the minimum distance between the other side of the carrier and the enclosure is the second distance, which is 5mm to 15mm.

17. The battery device according to claim 16, characterized in that, Along the third direction, when one side of the carrier is in contact with the buffer, the minimum distance between the other side of the carrier and the enclosure is the third distance, which is 5mm to 15mm.

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

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