A battery device and an electrical device

Abstract

This application provides a battery device and an electrical device, relating to the field of battery technology. The battery device includes a battery box, battery cell assemblies, electrical connectors, and limiting members. The battery box has a receiving cavity. Multiple battery cell assemblies are disposed within the receiving cavity and spaced apart along a first direction. At least one battery cell assembly includes multiple battery cells arranged along a second direction. Adjacent battery cell assemblies are connected by electrical connectors. At least a portion of the electrical connector is disposed on one side of the battery cell assembly along a third direction. The limiting member is disposed on one side of the battery cell assembly along the third direction and abuts against the battery cell assembly. Both ends of the limiting member along the second direction are connected to the battery box. A clearance groove is formed on the side of the limiting member facing the electrical connector, and the electrical connector passes through the clearance groove, allowing the limiting member to avoid the electrical connector. The first direction, second direction, and third direction intersect each other. This design can both suppress battery cell expansion and reduce the production cost of the battery device.

Description

Technical Field

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

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0003] In existing battery systems, battery devices typically include a battery box and individual battery cells located within the battery box. To suppress individual cell expansion, a solution exists that uses steel strips to secure the cells to the battery box. However, due to the steel strips, electrical connectors between adjacent battery cells need to avoid them, increasing the number of connectors and raising production costs. Therefore, balancing the suppression of individual cell expansion with reducing production costs is one of the research directions in the industry. Utility Model Content

[0004] In view of this, this application aims to provide a battery device and an electrical device that can both suppress the expansion of individual battery cells and reduce the production cost of the battery device.

[0005] To achieve the above objectives, embodiments of this application provide a battery device, the battery device comprising:

[0006] Battery box, the battery box having a receiving cavity;

[0007] Multiple battery cell assemblies are disposed within the receiving cavity and spaced apart along a first direction, and at least one of the battery cell assemblies includes multiple battery cells arranged along a second direction.

[0008] At least one electrical connector is provided, through which adjacent battery cell assemblies are connected, and at least a portion of the electrical connector is disposed on one side of the battery cell assembly along a third direction;

[0009] At least one limiting member is disposed on one side of the battery cell assembly along the third direction and abuts against the battery cell assembly. The two ends of the limiting member along the second direction are connected to the battery box. A clearance groove is formed on the side of the limiting member facing the electrical connector. The electrical connector passes through the clearance groove, so that the limiting member avoids the electrical connector.

[0010] The battery device provided in this application embodiment, because the two ends of the limiting member are respectively connected to the battery box, can suppress the expansion of individual battery cells, thereby reducing lithium plating. A clearance groove is formed on the side of the limiting member facing the electrical connector, and the electrical connector passes through the clearance groove, allowing the limiting member to avoid the electrical connector. Therefore, adjacent battery cell assemblies can be directly connected through the electrical connector. Compared to having the electrical connector avoid the limiting member, this saves on the number of electrical connectors used, reduces production costs, and simplifies the design of the electrical connectors. The battery device provided in this application embodiment can simultaneously suppress individual battery cell expansion and reduce the production cost of the battery device.

[0011] In one embodiment, the limiting member includes a main body and an insulating structural member, the main body being made of a metallic material, and at least a portion of the insulating structural member being disposed on the side of the main body facing the battery cell along the third direction.

[0012] It can achieve insulation between the limiting component and the battery cell. In addition, it can also improve the structural strength of the main body.

[0013] In one embodiment, the clearance groove is formed in the insulating structure, and the main body and the electrical connector are spaced apart by the insulating structure.

[0014] In this way, existing main components can be used without redesign, thus reducing costs. Furthermore, the clearance groove also incorporates insulating structural components, which protect the insulation layer and improve the reliability of the interface between the clearance groove and the electrical connector.

[0015] In one embodiment, along the third direction, the thickness of the portion of the insulating structure located between the main body and the electrical connector ranges from 0.6 mm to 1.5 mm.

[0016] In this way, the clearance groove can have enough space to avoid electrical connectors while also ensuring the structural strength of the insulating components.

[0017] In one embodiment, the insulating structural member is disposed on one side of the electrical connector along the second direction, and the end of the insulating structural member and the main body together form the clearance groove;

[0018] The limiting member further includes a protective layer, which at least covers the surface of the main body facing the electrical connector in the third direction.

[0019] In this embodiment, since the clearance groove has no insulating structural components, a protective layer is provided to protect the insulating layer. For example, it can prevent the battery cells from igniting with the limiting components during thermal runaway, and it can also prevent the limiting components and electrical connectors from rubbing against each other and damaging the insulating layer when they are relatively displaced, thereby improving the reliability of the interface between the clearance groove and the electrical connectors.

[0020] In one embodiment, the protective layer includes at least one of a mica layer, a carbon fiber composite material layer, an aerogel layer, a polycarbonate layer, a polypropylene layer, and a polyethylene terephthalate layer.

[0021] Materials such as mica layer, carbon fiber composite layer, aerogel layer, polycarbonate layer, polypropylene layer, and polyethylene terephthalate layer have good thermal insulation effects and can prevent the battery cells from igniting with the limiting components during thermal runaway.

[0022] In one embodiment, the protective layer covers the portion of the main body that is opposite to the electrical connector along the third direction.

[0023] This helps improve the reliability of the connection between the protective layer and the main body.

[0024] In one embodiment, the insulating structural member includes an insulating body and two insulating sidewalls connected to the insulating body. The two insulating sidewalls are disposed opposite to each other along the first direction and form a mounting groove with the insulating body. A portion of the main body is accommodated within the mounting groove.

[0025] In this way, the insulating structural component can simultaneously cover the bottom edge and two sides of the main body, which can not only isolate the main body from the battery cells using the insulating main body, but also isolate the main body from adjacent components using the insulating sidewalls.

[0026] In one embodiment, the limiting member further includes an insulating layer that covers at least a portion of the main body.

[0027] In this embodiment, the insulating structural component can be fixedly connected to the insulating layer of the main body, and the metal component is insulated from the battery cell through the insulating layer and the insulating structural component. During the transportation or installation of the battery device, the insulating layer may partially detach, and the insulating structural component can keep the limiting component insulated. In addition, the insulating structural component can also protect the insulating layer, for example, preventing the battery cell from arcing with the limiting component in the event of thermal runaway, and also preventing the limiting component and electrical connector from rubbing against each other and damaging the insulating layer when relative displacement occurs.

[0028] In one embodiment, within a projection plane perpendicular to the third direction, the projections of each of the battery cell assemblies overlap with the projection of at least one of the limiting members.

[0029] Therefore, the expansion force of the battery cell can be evenly borne by multiple limiting components, which can reliably reduce the probability of the battery cell expanding due to charging and / or discharging or reduce the degree of expansion of the battery cell assembly due to charging and / or discharging.

[0030] In one embodiment, in a projection plane perpendicular to the third direction, the projection of at least one of the limiting members overlaps with the projections of two adjacent battery cell assemblies along the first direction; and / or, the limiting member is bonded to the corresponding battery cell assembly.

[0031] This further reduces the probability of battery cells swelling due to charging and / or discharging, or mitigates the degree of swelling caused by charging and / or discharging.

[0032] In one embodiment, the battery box includes at least two connecting beams spaced apart along the second direction, the battery cell assembly is disposed between two adjacent connecting beams, and the limiting member is connected to the two adjacent connecting beams at both ends along the second direction.

[0033] The connecting beams are spaced apart along the second direction, and the battery cell assembly is disposed between two adjacent connecting beams. In this way, the connecting beams can bear the expansion force of the battery cell assembly, reliably reducing the probability or degree of expansion of the battery cell assembly due to charging and / or discharging. Furthermore, the expansion of the battery cell can be further suppressed by the limiting members connecting to the two adjacent connecting beams at both ends along the second direction.

[0034] In one embodiment, along the third direction, the distance between the portion of the electrical connector located within the clearance groove and the limiting member ranges from 0 to 2 mm.

[0035] In this way, the structural strength and installation space of the limiting component can be taken into account while avoiding the electrical connection component.

[0036] In one embodiment, along the third direction, the thickness of a portion of the limiting member is smaller than the thickness of other portions of the limiting member, to form the clearance groove.

[0037] In this way, while avoiding electrical connectors, the space occupied by the limiting component in the third direction can be minimized as much as possible.

[0038] In one embodiment, a portion of the limiting member protrudes away from the electrical connector along the third direction to form the clearance groove on the side of the limiting member facing the electrical connector along the third direction.

[0039] In this way, the limiter can avoid electrical connectors while ensuring the structural strength of the limiter.

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

[0041] Since the electrical device includes the battery device provided above, it can both suppress the expansion of individual battery cells and reduce the production cost of the battery device. Therefore, it can correspondingly improve the reliability of the electrical device and reduce the production and maintenance costs of the electrical device. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0043] Figure 2 This is an exploded view of the battery device according to the first embodiment of this application;

[0044] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0045] Figure 4 for Figure 2 Schematic diagram of the middle limiting component;

[0046] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0047] Figure 6 This is an exploded view of the battery device according to the second embodiment of this application;

[0048] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0049] Figure 8 for Figure 6 A partial structural diagram of the middle limiting component;

[0050] Figure 9 for Figure 8 Enlarged view of point D in the middle.

[0051] Explanation of reference numerals in the attached figures

[0052] 10. Battery cell assembly; 11. Battery cell; 20. Battery box; 21. Box body; 22. Cover; 23. Connecting beam; 30. Electrical connector; 40. Limiting component; 41. Main body; 412. Insulating layer; 42. Insulating structural component; 421. Insulating main body; 422. Insulating sidewall; 43. Clearance groove; 44. Protective layer; 45. Pad; 46. Adhesive layer; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0053] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first," "second," "third," and "fourth" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0056] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application may be combined with each other to form new technical solutions.

[0057] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0058] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0059] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0060] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0061] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "projection" refers to an orthographic projection in which parallel projection lines are perpendicular to the projection plane.

[0062] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace, robotics, and many other fields.

[0063] In existing battery systems, battery devices typically include a battery box and individual battery cells located within the box. To suppress individual cell expansion, one approach is to use limiting components that are locked to the battery box. However, due to these limiting components, electrical connectors between adjacent battery cells must avoid them, increasing the number of connectors and raising production costs. Furthermore, if there is insufficient space outside the battery cells, the connectors may not even be feasible. Therefore, balancing the suppression of individual cell expansion with reducing production costs is one of the research directions in the industry.

[0064] Research has shown that if a clearance groove is formed on the side of the limiting member facing the electrical connector, and the clearance groove is used to avoid the electrical connector, then on the one hand, the strength and rigidity of the battery box can be enhanced by the limiting member, improving the ability to resist the expansion of individual battery cells; on the other hand, the clearance of the electrical connector can save the amount of electrical connector used, thus simultaneously suppressing the expansion of individual battery cells and reducing the production cost of the battery device.

[0065] Based on this design concept, this application provides a battery device including a battery box, multiple battery cell assemblies, at least one electrical connector, and at least one limiting member. The battery box has a receiving cavity. Multiple battery cell assemblies are disposed within the receiving cavity and spaced apart along a first direction. At least one battery cell assembly includes multiple battery cells arranged along a second direction. Adjacent battery cell assemblies are connected by the electrical connector. At least a portion of the electrical connector is disposed on one side of the battery cell assembly along a third direction. The limiting member is disposed on one side of the battery cell assembly along the third direction and abuts against the battery cell assembly. Both ends of the limiting member along the second direction are connected to the battery box. A clearance groove is formed on the side of the limiting member facing the electrical connector, through which the electrical connector passes, allowing the limiting member to avoid the electrical connector. The first direction, the second direction, and the third direction intersect each other.

[0066] The battery device provided in this application embodiment, because the two ends of the limiting member are respectively connected to the battery box, can suppress the expansion of individual battery cells, thereby reducing lithium plating. A clearance groove is formed on the side of the limiting member facing the electrical connector, and the electrical connector passes through the clearance groove, allowing the limiting member to avoid the electrical connector. Therefore, adjacent battery cell assemblies can be directly connected through the electrical connector. Compared to having the electrical connector avoid the limiting member, this saves on the number of electrical connectors used, reduces production costs, and simplifies the design of the electrical connectors. The battery device provided in this application embodiment can simultaneously suppress individual battery cell expansion and reduce the production cost of the battery device.

[0067] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical device includes the battery device according to any embodiment of this disclosure, and the battery device is used to provide electrical energy.

[0068] The battery devices provided in this application can be used, but are not limited to, in vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, robots, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This disclosure does not impose any special limitations on the above-mentioned electrical equipment.

[0069] It should be noted that the technical solutions described in this disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices.

[0070] In the following embodiments, for ease of explanation, an example of an electrical device according to an embodiment of this application is a vehicle.

[0071] Please see Figure 1 The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0072] In some embodiments of this application, 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.

[0073] Figure 2 This is an exploded view of the battery device 100 according to the first embodiment of this application. The battery device 100 mentioned in the embodiments of this application may include multiple battery cells 11 for providing voltage and capacity. The multiple battery cells 11 are connected in series, parallel, or mixed via a busbar.

[0074] In some embodiments, the battery apparatus 100 may include one or more battery cell assemblies 10. The battery cell assembly 10 may include a plurality of battery cells 11, which are connected in series, parallel or mixed connection via a busbar.

[0075] In some embodiments, a battery cell assembly 10 is typically formed by arranging multiple battery cells 11; as an example, one or more battery cell assemblies 10 can constitute a battery module, which is formed by arranging and fixing multiple battery cell assemblies 10 into a single module. As an example, a battery module can be formed by binding multiple battery cell assemblies 10 together with cable ties.

[0076] In some embodiments, the battery device 100 may be a battery pack, which includes a battery case 20 and one or more battery cell assemblies 10, the battery cell assemblies 10 being housed in the battery case 20.

[0077] As an example, one or more battery cell assemblies 10 can constitute a battery module, and the battery cell assemblies 10 can be housed in the battery case 20 by fixing the battery module in the battery case 20.

[0078] As an example, the battery cell assembly 10 can also be housed in the battery box 20 by directly fixing multiple battery cells 11 to the battery box 20.

[0079] In this embodiment of the application, the battery cell 11 can be a secondary battery, which refers to the battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0080] The battery cell 11 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0081] A battery cell 11 typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and / or discharging of the battery cell 11, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0082] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0083] In some embodiments, the separator is a separator membrane. This application 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.

[0084] In some embodiments, the battery cell 11 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application embodiment does not specifically limit the type of electrolyte and can select one according to requirements. The electrolyte can be liquid, gel, or solid.

[0085] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0086] In some embodiments, the electrode assembly has a stacked structure.

[0087] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0088] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0089] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0090] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0091] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0092] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal, etc.

[0093] In some embodiments, the electrode assembly has tabs (not shown) that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0094] In some embodiments, the battery cell 11 may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0095] As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. There are no particular limitations in the embodiments of this application.

[0096] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal pressure of the battery cell 11.

[0097] In other embodiments, the pressure relief mechanism may also be referred to as an explosion-proof valve.

[0098] As an example, the internal pressure or temperature of the battery cell 11 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 11 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 11.

[0099] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0100] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0101] The term "actuation" as used in this application refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 11. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 11 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 11 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0102] The emissions from the battery cell 11 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0103] In some embodiments, the housing is provided with electrode terminals, which pass through the housing and are electrically connected to the electrode assembly via tabs.

[0104] In some specific embodiments, the electrode terminals are made of conductive metal, such as copper or aluminum.

[0105] The "multiple" mentioned in the embodiments of this application refers to two or more.

[0106] The battery box 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0107] The battery box 20 is used to install the battery cell 11. The battery box 20 can carry the battery cell 11, and the battery cell 11 is installed to the electrical equipment through the battery box 20.

[0108] As an example, the battery box 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the battery box 20 forms an enclosed space to accommodate the battery cell assembly 10.

[0109] In some embodiments, the battery box 20 may be part of the chassis structure of the vehicle 1000. For example, a portion of the battery box 20 may be at least a portion of the floor of the vehicle 1000, or a portion of the battery box 20 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0110] For example, the battery box 20 is typically a cuboid structure. Both its length and width directions are parallel to the horizontal plane, and its length direction is parallel to the longest side of the cuboid structure. The height direction of the battery box 20 is perpendicular to the ground. For example, the length direction of the battery box 20 may be a first direction, the width direction a second direction, and the height direction a third direction; or the length direction may be the second direction, the width direction the first direction, and the height direction a third direction.

[0111] Below, refer to Figures 2 to 9 Some embodiments of this application will be described in detail.

[0112] In the description of the embodiments of this application, for ease of explanation, the direction where X is located is represented as the "first direction", the direction where Y is located is represented as the "second direction", and the direction where Z is located is represented as the "third direction". The first direction, the second direction, and the third direction intersect each other and are not coplanar. In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0113] Please see Figures 2 to 8This application provides a battery device 100, which includes a battery case 20, a plurality of battery cell assemblies 10, at least one electrical connector 30, and at least one limiting member 40. The battery case 20 has a receiving cavity. The plurality of battery cell assemblies 10 are disposed within the receiving cavity and spaced apart along a first direction. At least one battery cell assembly 10 includes a plurality of battery cells 11 arranged along a second direction. Adjacent battery cell assemblies 10 are connected by electrical connectors 30. At least a portion of the electrical connector 30 is disposed on one side of the battery cell assembly along a third direction. The limiting member 40 is disposed on one side of the battery cell assembly along the third direction and abuts against the battery cell assembly. Both ends of the limiting member along the second direction are connected to the battery case 20. A clearance groove 43 is formed on the side of the limiting member 40 facing the electrical connector 30, through which the electrical connector passes, allowing the limiting member to avoid the electrical connector 30. The first direction, the second direction, and the third direction intersect each other.

[0114] In some embodiments, such as Figure 2 As shown, the battery box 20 includes a box body 21 and a cover 22. The box body 21 has an opening that opens in a third direction. The box body 21 and the cover 22 are aligned in the third direction, and the cover 22 closes the opening of the box body 21. The receiving cavity can accommodate the battery cell assembly 10.

[0115] Optionally, the battery cell assembly 10 can be two, three or more, etc.

[0116] In some embodiments, the battery cell assembly 10 includes a plurality of battery cells 11 arranged along a second direction.

[0117] For example, the individual battery cells 11 of the same battery cell assembly 10 can also be electrically connected via electrical connectors 30.

[0118] The limiting member 40 is a component connected to the battery box 20 and serves to suppress the expansion force of the battery cell 11. The limiting member 40 can be a long strip-shaped structure, and the extending direction of the limiting member 40 is the same as the second direction. The limiting member 40 is located on one side of the battery cell 11 along the third direction, and can constrain the battery cell 11 in the second direction.

[0119] For example, the third direction is the height direction of the battery cell 11 and the battery assembly 100. Thus, both the electrical connector 30 and the limiting member 40 are disposed on the top of the battery cell 11.

[0120] The two ends of the limiting member 40 are respectively connected to the battery box 20. The limiting member 40 can be connected to the battery box 20 by at least one of the following methods: snap-fit, welding, riveting, bonding or bolting.

[0121] For example, adjacent battery cell assemblies 10 are connected in parallel or in series via electrical connectors 30.

[0122] For example, the battery cell assembly 10 may be one of the battery cells 11 located at the end in the second direction connected to the adjacent battery cell assembly 10 via an electrical connector 30, or it may be two battery cells 11 located at the end in the second direction connected to the adjacent battery cell assembly 10 via electrical connectors 30 respectively.

[0123] It should be noted that there is no limit to the number of electrical connectors 30.

[0124] The number of electrical connectors 30 corresponds to the number of battery cell assemblies 10. For example, the number of battery cell assemblies 10 is 6 and the number of electrical connectors 30 is 5.

[0125] It should be noted that the electrical connector 30 can also be called a bar plate.

[0126] The limiting member 40 has a relief groove 43 on the side facing the electrical connector 30. In other words, while ensuring the structural strength of the limiting member 40, the relief groove 43 is provided to avoid interference with the electrical connector 30. As a result, the electrical connector 30 does not need to be folded away from the battery cell assembly 10 to avoid the limiting member 40, which can save on the number of electrical connectors used, reduce production costs, and reduce the design difficulty of the electrical connector 30.

[0127] For example, the clearance groove 43 corresponds one-to-one with the electrical connector 30.

[0128] In some embodiments, please refer to Figure 2 The number of limiting members 40 can be multiple. The multiple limiting members 40 can be arranged generally parallel or non-parallel along the first direction.

[0129] In some embodiments, the arrangement direction of the plurality of limiting members 40 may be substantially the same as the arrangement direction of the plurality of battery cell assemblies 10. Optionally, the arrangement direction of the plurality of limiting members 40 may also intersect with the arrangement direction of the plurality of battery cell assemblies 10.

[0130] In some embodiments, the number of battery cell assemblies 10 and the number of limiting members 40 may be the same or different.

[0131] The battery device 100 provided in this application embodiment, since the two ends of the limiting member 40 are respectively connected to the battery box 20, can suppress the expansion of the battery cell 11, thereby reducing lithium plating. A clearance groove 43 is formed on the side of the limiting member 40 facing the electrical connector 30, and the electrical connector 30 passes through the clearance groove 43, allowing the limiting member 40 to avoid the electrical connector 30. Therefore, adjacent battery cell assemblies 10 can be directly connected through the electrical connector 30. Compared to having the electrical connector 30 avoid the limiting member 40, this saves on the number of electrical connectors 30 used, reduces production costs, and simplifies the design of the electrical connectors 30. The battery device 100 provided in this application embodiment can simultaneously suppress battery cell expansion and reduce the production cost of the battery device 100.

[0132] In some embodiments, along a third direction, the distance between the portion of the electrical connector 30 located within the clearance groove 43 and the limiting member 40 ranges from 0 to 2 mm.

[0133] Along a third direction, the distance between the portion of the electrical connector 30 located within the clearance groove 43 and the limiting member 40 can be any one of 0, 0.2 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, or 2 mm, or any combination thereof.

[0134] In this way, the structural strength and installation space of the limiting member 40 can be taken into account while avoiding the electrical connector 30.

[0135] In some embodiments, please refer to Figure 2 and Figure 6 The battery box 20 includes at least two connecting beams 23 spaced apart along a second direction, the battery cell assembly 10 is disposed between two adjacent connecting beams 23, and the limiting member 40 is connected to the two adjacent connecting beams 23 at both ends along the second direction.

[0136] For example, the connecting beam 23 is an expansion beam.

[0137] For example, the two ends of the connecting beam 23 along the first direction are connected to the side wall of the battery box 20.

[0138] The connecting beams 23 are spaced apart along the second direction, and the battery cell assembly 10 is disposed between two adjacent connecting beams 23. In this way, the connecting beams 23 can bear the expansion force of the battery cell assembly 10, reliably reducing the probability of the battery cell assembly 10 expanding due to charging and / or discharging, or mitigating the degree of expansion of the battery cell assembly 10 due to charging and / or discharging. Furthermore, the expansion of the battery cell assembly 10 can be further suppressed by the limiting members 40 being connected to the two adjacent connecting beams 23 at both ends along the second direction.

[0139] In some embodiments, please refer to Figures 3 to 5 The limiting member 40 also includes a pad 45, which is fixed between the battery box 20 and the limiting member 40.

[0140] For example, the pad 45 is fixed between the connecting beam 23 and the limiting member 40.

[0141] The pad 45 can be a sheet or a block structure, used to pad between the limiting member 40 and the connecting beam 23. Specifically, the pad 45 is located between the limiting member 40 and the connecting beam 23, and fasteners can be sequentially inserted through the limiting member 40 and the pad 45 and fixed to the connecting beam 23. The height of the pad 45 can be set according to the height difference between the battery cell 11 and the connecting beam 23.

[0142] By providing a spacer 45 between the limiting member 40 and the connecting beam 23, the limiting member 40 can be easily connected to both the connecting beam 23 and the battery cell 11. Furthermore, the spacer 45 increases the contact area between the limiting member 40 and the fasteners, thereby improving the connection strength.

[0143] In some embodiments, please refer to Figure 3 In a projection plane perpendicular to a third direction, the projections of each battery cell assembly 10 overlap with the projection of at least one limiting member 40.

[0144] Within a projection plane perpendicular to a third direction, the projection of each battery cell assembly 10 may overlap with the projection of one, two, three or more limiting members 40.

[0145] For example, the projection of each battery cell assembly 10 may overlap with the projection of one limiting member 40; or, the projection of each battery cell assembly 10 may overlap with the projections of two limiting members 40; or, the projection of a portion of the battery cell assembly 10 may overlap with the projection of one or two limiting members 40.

[0146] This article does not specify the exact area of ​​the overlapping portion between the projection of each battery cell assembly 10 and the projection of the limiting member 40 in a projection plane perpendicular to the third direction. The area of ​​the overlapping portion can be adjusted according to requirements.

[0147] Therefore, the expansion force of the battery cell assembly 10 can be evenly borne by multiple limiting members 40, which can reliably reduce the probability of the battery cell assembly 10 expanding due to charging and / or discharging or reduce the degree of expansion of the battery cell assembly 10 due to charging and / or discharging.

[0148] It is understandable that, within a projection plane perpendicular to the third direction, the projection of a portion of the battery cell assembly 10 and the projection of the limiting member 40 may not overlap.

[0149] In some embodiments, please refer to Figure 3 In a projection plane perpendicular to a third direction, the projection of at least one limiting member 40 overlaps with the projections of two adjacent battery cell assemblies 10 along the first direction.

[0150] In some embodiments, in a projection plane perpendicular to a third direction, the projections of each limiting member 40 overlap with the projections of two adjacent battery cell assemblies 10 along the first direction.

[0151] Therefore, at least both ends of a portion of the battery cell 11 along the first direction are correspondingly bound by the limiting member 40, so that the battery cell assembly 10 can be clamped evenly and reliably, further reducing the probability of the battery cell assembly 10 expanding due to charging and / or discharging or mitigating the degree of expansion of the battery cell assembly 10 due to charging and / or discharging.

[0152] In one specific embodiment, the portion of the top cover located on both sides of the electrode terminals along the first direction is referred to as the shoulder of the battery cell 11, and the shoulders of all battery cells 11 in the battery cell assembly 10 are referred to as the shoulders of the battery cell assembly 10. The projection of a limiting member 40 can overlap with the shoulders of two adjacent battery cell assemblies 10.

[0153] In some embodiments, please refer to Figures 3 to 8 The limiting member 40 is bonded to the corresponding battery cell assembly 10.

[0154] In one specific embodiment, the limiting member 40 is bonded to the shoulder of the corresponding battery cell assembly 10.

[0155] In this way, the limiting member 40 can be connected to the corresponding battery cell assembly 10 as a whole, further reducing the probability of the battery cell assembly 10 expanding due to charging and / or discharging or mitigating the degree of expansion of the battery cell assembly 10 due to charging and / or discharging, thereby further reducing the probability of deformation of the battery device 100 or mitigating the degree of deformation of the battery device 100.

[0156] It should be noted that there are multiple ways to form the clearance groove 43.

[0157] In some embodiments, please refer to Figures 3 to 5 Along the third direction, the thickness of a portion of the limiting member 40 is smaller than the thickness of other portions of the limiting member 40, so as to form an clearance groove 43.

[0158] For example, the limiting member 40 can be locally thinned to form the clearance groove 43.

[0159] In this way, while avoiding the electrical connector 30, the space occupied by the limiting member 40 in the third direction can be minimized as much as possible.

[0160] For example, at least a portion of the electrical connector 30 is located within the clearance groove.

[0161] In other embodiments, a portion of the limiting member 40 protrudes in a third direction away from the electrical connector 30 to form a clearance groove 43 on the side of the limiting member 40 facing the electrical connector 30 in a third direction.

[0162] In other words, the thickness of the limiting member 40 in the clearance groove 43 is the same as the thickness of other areas of the limiting member 40. In this way, it can both avoid the electrical connector 30 and ensure the structural strength of the limiting member 40.

[0163] The limiting component 40 has various structural forms.

[0164] In some embodiments, please refer to Figure 5 and Figure 9 The limiting member 40 includes a main body 41 and an insulating structure 42. The main body 41 is made of a metallic material, and at least a portion of the insulating structure 42 is disposed on the side of the main body 41 facing the battery cell 11 in a third direction.

[0165] For example, the material of the main body 41 can be high-strength spring steel or carbon steel.

[0166] For example, the insulating structure 42 is provided on the side of the main body 41 facing the battery cell 11. The insulating structure 42 has an insulating effect, thereby achieving insulation between the limiting member 40 and the battery cell 11. In addition, it can also improve the structural strength of the main body 41.

[0167] For example, the insulating structural member 42 may also be wrapped around the surface of the main body portion 41.

[0168] For example, both the main body 41 and the insulating structure 42 extend along the second direction.

[0169] In some embodiments, please refer to Figure 5 and Figure 9 The limiting member 40 also includes an insulating layer 412, which covers at least a portion of the main body 41.

[0170] For example, the insulating layer 412 may be a thermoplastic insulating layer 412, or it may be an insulating coating or other insulating structure.

[0171] In this embodiment, the insulating structural member 42 can be fixedly connected to the insulating layer 412 of the main body 41, and the metal part is insulated from the battery cell 11 through the insulating layer 412 and the insulating structural member 42. During the transportation or installation of the battery device 100, the insulating layer 412 may partially fall off, and the insulating structural member 42 can keep the limiting member 40 insulated. In addition, the insulating structural member 42 can also protect the insulating layer 412, for example, to prevent the battery cell 11 from arcing with the limiting member 40 in the event of thermal runaway, and to prevent the limiting member 40 and the electrical connector 30 from rubbing against each other and damaging the insulating layer 412 when relative displacement occurs.

[0172] In some embodiments, please refer to Figure 5 The clearance groove 43 is formed on the insulating structure 42, and the electrical connector 30 passes through the clearance groove 43, so that the main body 41 and the electrical connector 30 are separated by the insulating structure 42.

[0173] As an example, the insulating structural member 42 is thinned to form the clearance groove 43.

[0174] In other words, the limiting member 40 is formed by partially thinning the insulating structural member 42 to create a clearance groove, which is the clearance groove 43. This allows for the use of the existing main body 41 without redesign, thus reducing costs. Furthermore, the clearance groove 43 retains a portion of the insulating structural member 42, which protects the insulating layer 412, thereby improving the reliability of the interface between the clearance groove 43 and the electrical connector 30.

[0175] For example, the thickness of the insulating structure 42, excluding the clearance groove 43, is 2mm-2.5mm.

[0176] In some embodiments, please refer to Figure 5 Along the third direction, the thickness of the portion of the insulating structure 42 located between the main body 41 and the electrical connector 30 ranges from 0.6 mm to 1.5 mm.

[0177] Along a third direction, the thickness of the portion of the insulating structure 42 located between the main body 41 and the electrical connector 30 can be any one of 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm, or any value between two of them.

[0178] In this way, the clearance groove 43 can have enough space to avoid the electrical connector 30, while also taking into account the structural strength of the insulating structure 42.

[0179] In some embodiments, please refer to Figures 7 to 9An insulating structural member 42 is disposed on one side of the electrical connector 30 along the second direction, and the end of the insulating structural member 42 and the main body 41 together form a relief groove 43. The limiting member 40 also includes a protective layer 44, which at least covers the surface of the main body 41 facing the electrical connector 30 along the third direction.

[0180] In other words, the limiting member 40 does not have an insulating structure 42 in the clearance groove 43, or the insulating structure 42 is partially cut off in the clearance groove 43 to avoid interference with the electrical connector 30.

[0181] The limiting member 40 also includes a protective layer 44 disposed in the clearance groove 43, and is disposed at least on the side of the main body 41 facing the battery cell 11. In the third direction, the insulating structure member 42 is closer to the battery cell 11 than the protective layer 44.

[0182] In other words, on the side of the third-party upward-facing battery cell 11, there is a certain height difference between the insulating structure 42 and the protective layer 44, that is, the insulating structure 42 protrudes from the surface of the protective layer 44 to form an avoidance groove 43 in the area where the protective layer 44 is located.

[0183] It should be noted that the insulating structural component 42 mentioned here is closer to the battery cell 11 than the protective layer 44, meaning it is closer to the plane where the shoulder of the battery cell 11 is located.

[0184] In this embodiment, since the clearance groove 43 does not have an insulating structure 42, the protective layer 44 can protect the insulating layer 412 by setting a protective layer. For example, it can prevent the battery cell 11 from arcing with the limiting member 40 during thermal runaway, and it can also prevent the limiting member 40 and the electrical connector 30 from rubbing against each other and damaging the insulating layer 412 when they are relatively displaced, thereby improving the reliability of the interface between the clearance groove 43 and the electrical connector 30.

[0185] It should be noted that there are several specific types of protective layer 44.

[0186] In some embodiments, the protective layer 44 includes at least one of a mica layer, a carbon fiber composite layer, an aerogel layer, a polycarbonate layer, a polypropylene layer, and a polyethylene terephthalate layer.

[0187] Materials such as mica layer, carbon fiber composite layer, and aerogel layer have good thermal insulation effect, which can prevent the battery cell 11 from igniting with the limiting component 40 in the event of thermal runaway.

[0188] The polycarbonate layer has good wear resistance, which can prevent the limiting member 40 and the electrical connector 30 from rubbing against each other and damaging the insulation layer 412 when relative displacement occurs.

[0189] For example, the thickness of the polycarbonate layer can be from 0.5 mm to 1.5 mm.

[0190] Of course, the protective layer 44 can also be other heat-insulating materials and / or wear-resistant materials.

[0191] In some embodiments, please refer to Figure 9 The protective layer 44 covers the portion of the main body 41 that is opposite to the electrical connector 30 in a third direction.

[0192] This helps to improve the reliability of the connection between the protective layer 44 and the main body 41.

[0193] In other embodiments, the protective layer 44 may be disposed only on the side of the main body 41 facing the battery cell 11.

[0194] In some embodiments, please refer to Figure 5 and Figure 9 The insulating structural component 42 includes an insulating body 421 and two insulating sidewalls 422 connected to the insulating body 421. The two insulating sidewalls 422 are arranged opposite to each other along a first direction and form a mounting groove with the insulating body 421. A portion of the main body 41 is accommodated in the mounting groove.

[0195] The insulating structural member 42 is generally in the shape of a strip-shaped box, with its opening facing the main body 41. Two insulating sidewalls 422 are each located on one side of the insulating main body 421 along a third direction; the two sidewalls 422 can be arranged parallel to each other or at an angle. The main body 41 is accommodated and fixed within the mounting groove of the insulating structural member 42, meaning the two insulating sidewalls 422 respectively cover the sides of the main body 41, and the insulating main body 421 covers the bottom edge of the main body 41.

[0196] In this way, the insulating structure 42 can cover the bottom edge and two sides of the main body 41 at the same time, which can not only isolate the main body 41 from the battery cell 11 by the insulating main body 421, but also isolate the main body 41 from adjacent components by the insulating sidewall 422.

[0197] In other embodiments, the insulating structure 42 may also be of other structures, for example, the insulating sidewall 422 of the insulating structure 42 may be omitted.

[0198] Please see Figure 5 and Figure 9 In some embodiments, the main body 41 is fixed to the mounting groove by an adhesive layer 46.

[0199] Specifically, the main body 41 is fixedly bonded to the insulating body 421 by an adhesive layer 46. Since the main body 41 includes a metal part and an insulating layer 412 covering the metal part, the adhesive layer 46 can be disposed between the insulating layer 412 and the insulating body 421. The insulating layer 412 can be structural adhesive, double-sided adhesive, etc.

[0200] In this embodiment, the main body 41 is bonded and fixed to the mounting groove of the insulating structure 42 by the adhesive layer 46. The bonding connection method is simple to operate, has strong connection reliability, and improves the reliability of the battery.

[0201] In some embodiments, the insulating structural member 42 includes at least one of ethylene-vinyl acetate copolymer (EVA) and polyamide.

[0202] In some embodiments, the insulating structural member 42 includes a first substrate and a plurality of first fibers, at least some of which intersect each other, and the first fibers include at least one of glass fiber, basalt fiber, and aramid fiber; the first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0203] For example, the insulating structural member 42 includes a first substrate (matrix phase) and a first fiber (reinforcing phase). The first substrate bonds multiple first fibers together, so that the first substrate and the first fibers form a whole, thereby giving the insulating structural member 42 continuity and integrity. The first fiber is used to improve the strength and stiffness of the insulating structural member 42 and enhance its mechanical properties.

[0204] Exemplarily, in some embodiments, the first fiber is a long fiber and extends along a second direction. This is beneficial for improving the mechanical properties of the insulating structure 42 in the second direction. In other embodiments, the first fiber is a short fiber.

[0205] Here, the insulating structural component 42 is a composite material layer, which has the characteristics of being lightweight and high-strength. This helps to reduce the weight of the limiting component 40 and improve the structural strength of the limiting component 40.

[0206] Here, glass fiber, basalt fiber, and aramid fiber are the reinforcing phases of the insulating structural component 42, which can give the limiting component 40 certain structural strength, insulation, high temperature resistance, expansion resistance, wear resistance and other properties.

[0207] The insulating structural member 42 forms a limiting member 40 on the side facing the battery cell 11. That is to say, the insulating structural member 42 may be in direct contact with the battery cell 11. Thus, by setting the insulating structural member 42 to include at least one of glass fiber, basalt fiber and aramid fiber, the insulating structural member 42 has the characteristics of insulation and pressure resistance, high temperature resistance, expansion resistance and wear resistance.

[0208] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0209] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A battery device, characterized by, The battery device includes: Battery box, the battery box having a receiving cavity; Multiple battery cell assemblies are disposed within the receiving cavity and spaced apart along a first direction, and at least one of the battery cell assemblies includes multiple battery cells arranged along a second direction. At least one electrical connector is provided, through which adjacent battery cell assemblies are connected, and at least a portion of the electrical connector is disposed on one side of the battery cell assembly along a third direction; At least one limiting member is disposed on one side of the battery cell assembly along the third direction and abuts against the battery cell assembly. The two ends of the limiting member along the second direction are connected to the battery box. A clearance groove is formed on the side of the limiting member facing the electrical connector. The electrical connector passes through the clearance groove, so that the limiting member avoids the electrical connector. The first direction, the second direction, and the third direction intersect each other.

2. The battery device according to claim 1, characterized by The limiting member includes a main body and an insulating structural member. The main body is made of a metallic material, and at least a portion of the insulating structural member is disposed on the side of the main body facing the battery cell in the third direction.

3. The battery device according to claim 2, characterized in that, The clearance groove is formed in the insulating structure, and the main body and the electrical connector are separated by the insulating structure.

4. The battery device according to claim 3, characterized in that, Along the third direction, the thickness of the portion of the insulating structure located between the main body and the electrical connector ranges from 0.6 mm to 1.5 mm.

5. The battery device according to claim 2, characterized in that, The insulating structural member is disposed on one side of the electrical connector along the second direction, and the end of the insulating structural member and the main body together form the clearance groove; The limiting member further includes a protective layer, which at least covers the surface of the main body facing the electrical connector in the third direction.

6. The battery device according to claim 5, characterized in that, The protective layer includes at least one of the following: a mica layer, a carbon fiber composite material layer, an aerogel layer, a polycarbonate layer, a polypropylene layer, and a polyethylene terephthalate layer.

7. The battery device according to claim 5, characterized in that, The protective layer covers the portion of the main body that is opposite to the electrical connector along the third direction.

8. The battery device according to claim 2, characterized in that, The insulating structural component includes an insulating body and two insulating sidewalls connected to the insulating body. The two insulating sidewalls are arranged opposite to each other along the first direction and form a mounting groove with the insulating body. A portion of the main body is accommodated in the mounting groove.

9. The battery device according to claim 2, characterized in that, The limiting member further includes an insulating layer that covers at least a portion of the main body.

10. The battery device according to any one of claims 1 to 9, characterized in that, Within a projection plane perpendicular to the third direction, the projections of each of the battery cell assemblies overlap with the projection of at least one of the limiting members.

11. The battery device according to claim 10, characterized in that, In a projection plane perpendicular to the third direction, the projection of at least one of the limiting members overlaps with the projections of two adjacent battery cell assemblies along the first direction; and / or, the limiting member is bonded to the corresponding battery cell assembly.

12. The battery device according to any one of claims 1 to 9, characterized in that, The battery box includes at least two connecting beams spaced apart along the second direction, the battery cell assembly is disposed between two adjacent connecting beams, and the limiting member is connected to the two adjacent connecting beams at both ends along the second direction.

13. The battery device according to any one of claims 1 to 9, characterized in that, Along the third direction, the distance between the portion of the electrical connector located within the clearance groove and the limiting member ranges from 0 to 2 mm.

14. The battery device according to claim 1, characterized in that, Along the third direction, the thickness of a portion of the limiting member is smaller than the thickness of other portions of the limiting member, so as to form the clearance groove.

15. The battery device according to claim 1, characterized in that, A portion of the limiting member protrudes away from the electrical connector along the third direction to form the clearance groove on the side of the limiting member facing the electrical connector along the third direction.

16. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 15.

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