Battery device, energy storage device, energy storage system, power utilization device and charging network

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network, the battery device comprises a box body, a battery monomer and a connecting component, the connecting component comprises a connecting main body provided with a mounting groove and a floating connecting piece mounted in the mounting groove, and the floating connecting piece is provided with a connecting hole; the mounting groove is provided with a first wall, the floating connecting piece is provided with a second wall, a first protrusion and a first groove which are matched in a concave-convex mode are arranged between the first wall and the second wall, and a first gap in the axial direction of the connecting hole is formed between the first protrusion and the groove wall of the first groove. The first wall and the second wall limit the floating connecting piece in the axial direction of the connecting hole through the concave-convex structure, the concave-convex structure can bear relatively large tension, pressure, torque and the like, the risk that the concave-convex structure deforms and breaks under the action of external force is reduced, and therefore the risk that the floating connecting piece gets loose due to connection failure can be effectively reduced, and the service life of the floating connecting piece is prolonged. And the mounting reliability and stability of the floating connecting piece are improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery device, an energy storage device, an energy storage system, an electrical device and a charging network. Background Art

[0002] With the development of science and technology, new energy electric vehicles have gradually become popular. As one of the core components of electric vehicles, batteries are the energy center of electric vehicles. For electric vehicles, battery technology is an important factor related to their development.

[0003] During the manufacturing process of batteries, the reliability of batteries is an issue that cannot be ignored. Therefore, how to improve the reliability of batteries is a technical issue in battery technology that requires long-term attention.

[0004] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a battery device, an energy storage device, an energy storage system, an electrical device and a charging network to improve the problem of insufficient reliability of battery devices in related technologies.

[0006] The technical solution adopted in the embodiment of the present application is:

[0007] In a first aspect, a battery device is provided, including a box body and a battery cell disposed in the box body, wherein the battery device is provided with a connecting member, and the connecting member includes:

[0008] The connecting body is provided with a mounting groove;

[0009] A floating connector is installed in the installation groove, and the floating connector is provided with a connection hole;

[0010] The mounting groove has a first wall, the floating connector has a second wall, one of the first wall and the second wall is provided with a first groove, the other of the first wall and the second wall is provided with a first protrusion inserted into the first groove, the first protrusion is arranged at an angle with the axial direction of the connecting hole, and along the axial direction of the connecting hole, there is a first gap between the first protrusion and the groove wall of the first groove, so that the floating connector can at least float along the axial direction of the connecting hole.

[0011] The battery device of the embodiment of the present application, its box body is provided with a connecting component, the connecting component includes a connecting body provided with a mounting groove and a floating connecting piece installed in the mounting groove of the connecting body, the floating connecting piece is provided with a connecting hole, the mounting groove has a first wall, the floating connecting piece has a second wall, a first protrusion and a first groove of concave-convex plug-in matching are provided between the first wall and the second wall, when the floating connecting piece is installed in the mounting groove, the first protrusion is inserted into the first groove, and the first protrusion and the first groove limit the floating connecting piece along the axial direction of the connecting hole through the concave-convex structure, compared with the use of the snap-on structure, the concave-convex structure can withstand relatively greater tension, pressure and torque, etc., and the risk of deformation and breakage of the structure due to external force is reduced, thereby effectively reducing the risk of loosening of the floating connecting piece due to connection failure, and improving the installation reliability and stability of the floating connecting piece. In addition, a first gap is provided between the first protrusion and the groove wall of the first groove along the axial direction of the connecting hole. The provision of the first gap allows the floating connector to have space to float up and down along the axial direction of the connecting hole, that is, by providing the first gap, the floating connector can at least float along the axial direction of the connecting hole. When a connecting member such as a screw or a bolt is inserted and fixed to the connecting hole of the floating connector, the floating connector can automatically adjust its position along the axial direction of the connecting hole when subjected to external force, thereby adapting to dimensional deviations between related connecting components, as well as vibrations or thermal expansion and contraction during use, so that the floating connector maintains good contact with connecting members such as bolts or screws, thereby improving the strength and reliability of the connecting member connecting other structures, thereby improving the reliability of the battery device.

[0012] In some embodiments, the first protrusion has a first surface perpendicular to the axial direction of the connecting hole, the first groove has a second surface perpendicular to the axial direction of the connecting hole, and the first gap is provided between the first surface and the second surface.

[0013] By adopting the technical solution of this embodiment, the first protrusion has a first surface, the first groove has a second surface, and the first surface and the second surface are arranged perpendicular to the axial direction of the connecting hole, so that the direction of the gap width of the first gap is just parallel to the axial direction of the connecting hole, and the floating connecting member can only generate axial floating of the connecting hole along the first gap. In this way, the width dimension of the first gap only needs to satisfy the axial floating of the floating connecting member along the axial direction of the connecting hole, which helps to simplify the design calculation of the first gap and reduce the difficulty of structural design. The first surface is arranged on the first protrusion, and the second surface is arranged in the first groove. The gap width between the first surface and the second surface only needs to satisfy the floating requirement of the floating connecting member along the axial direction of the connecting hole.

[0014] In some embodiments, the first groove is recessed along a direction perpendicular to the axial direction of the connecting hole, and the first protrusion is protruded along a direction perpendicular to the axial direction of the connecting hole;

[0015] The first protrusion has two surfaces disposed opposite to each other in the axial direction of the connecting hole to form two first surfaces, and the first groove has two side surfaces disposed opposite to each other in the axial direction of the connecting hole to form two second surfaces.

[0016] By adopting the technical solution of this embodiment, the first groove and the first protrusion cooperate to limit the axial movement of the floating connector along the connecting hole, so that it can only float through the first gap. The mutual cooperation of the first groove and the first protrusion can increase the contact area between the components, improve the strength and rigidity of the connection, thereby effectively reducing the risk of the floating connector escaping from the mounting groove along the axial direction of the connecting hole; on the other hand, the upper surface and the lower surface of the first protrusion along the axial direction of the connecting hole are both the first surface, and the upper side surface and the lower side surface of the first groove along the axial direction of the connecting hole are both the second surface. By designing the dimensions of the first protrusion and the first groove along the axial direction of the connecting hole, the first gap that meets the use requirements can be obtained, and the structural design is simple and practical.

[0017] In some embodiments, the mounting groove also has a first opening for the floating connector to fit in and fit into, the plane where the first opening is located is parallel to the axis of the connecting hole, the first wall is provided with a first groove, and one end of the first groove provided on the first wall passes through the first opening.

[0018] By adopting the technical solution of this embodiment, a first groove is provided on the groove wall of the installation groove, a first protrusion is provided at a position of the floating connection piece corresponding to the first groove, and one end of the first groove provided on the first wall passes through the first opening. In this way, when the floating connection piece is embedded from the first opening, the first protrusion can cooperate with the first groove to guide the floating connection piece to move, so that the floating connection piece can be quickly and smoothly embedded in the installation groove.

[0019] In some embodiments, the mounting groove has two first walls arranged opposite to each other along the width direction of the first opening, and the two first walls are each provided with a first groove. The floating connecting member has two second walls, and the two second walls are each provided with a first protrusion at a position corresponding to the first groove. The width direction of the first opening is perpendicular to the axial direction of the connecting hole.

[0020] By adopting the technical solution of this embodiment, a first protrusion and a first groove are respectively arranged on the opposite sides in the width direction of the first opening to cooperate with each other, so as to support and guide the installation of the floating connection member, thereby further improving the assembly efficiency and assembly accuracy of the floating connection member and the installation groove; and a first protrusion and a first groove are respectively arranged on the opposite sides in the width direction of the first opening to cooperate with each other, and a first gap is formed on the opposite sides of the floating connection member along the axial direction of the vertical connection hole, which helps to improve the floating balance of the floating connection member and improve the uniformity of the force during the floating process.

[0021] In some embodiments, the mounting groove further has a second opening, the plane where the second opening is located is arranged at an angle with the axis of the connecting hole, and the opening of the connecting hole passes through the second opening.

[0022] By adopting the technical solution of this embodiment, when the floating connector is installed in the installation groove, its connection hole is connected to the external environment through the second opening, so that the external connector can be inserted into the connection hole and connected to the floating connector.

[0023] In some embodiments, the floating connector is further provided with a second protrusion, and along the axial direction of the connecting hole, the second protrusion has a second gap above the second opening and the edge of the second opening, and the maximum width of the second gap is greater than or equal to the maximum width of the first gap.

[0024] By adopting the technical solution of this embodiment, the second protrusion is located in the upper space of the first protrusion, and the second protrusion can cooperate with the top wall of the connecting body to support and guide the movement of the floating connector. In addition, there is a second gap between the second protrusion and the edge of the second opening of the mounting groove, so that the setting of the second protrusion will not affect the floating of the floating connector along the first gap.

[0025] In some embodiments, the two side walls of the mounting groove that are relatively arranged along the width direction form two first walls, and the two side walls of the floating connector along the width direction form two second walls. There is a third gap between adjacent first walls and second walls so that the floating connector can float along the width direction of the mounting groove, and the width direction of the mounting groove is perpendicular to the axial direction of the connecting hole.

[0026] By adopting the technical solution of this embodiment, there is a certain spacing between the first wall and the second wall along the width direction of the installation groove, that is, along the direction perpendicular to the axis of the connection hole. The existence of this spacing can make the floating connector embed into the installation groove more quickly on the one hand, and can also make the floating connector have a certain activity space in the installation groove along the width direction, and will not limit the relative movement of each other due to the contact between the two in the width direction, so that the floating connector can have the floating ability along the width direction of the installation groove. The existence of this floating ability can make the floating connector move and adjust its position relative to the installation groove within a certain range along the width direction, so as to achieve the functions of adapting to different working conditions, absorbing vibration, and compensating for installation errors, etc., improve the connection reliability and stability of the floating connector, and reduce the influence of vibration on the connection strength.

[0027] In some embodiments, an elastic member is provided between adjacent first walls and second walls, one end of the elastic member is connected to one of the adjacent first walls and second walls, and the other opposite end of the elastic member is connected to or spaced from the other of the adjacent first walls and second walls.

[0028] By adopting the technical solution of this embodiment, the elastic member is elastically connected between the adjacent first wall and the second wall along the width direction of the mounting groove. The elastic member has the ability to undergo elastic deformation along the width direction of the mounting groove. The elastic member can connect the first wall and the second wall, so that the floating connection member can be installed in the mounting groove more stably and reliably. The elastic member can also play a role in buffering and vibration reduction. The elastic member can absorb vibration, impact, etc., reduce the influence of external force on the first wall, the second wall and the connection structure, and the presence of the elastic member can also allow the floating connection member to float along the second gap.

[0029] In some embodiments, the elastic member is an elastic arm protruding from the surface of the second wall, and the free end of the elastic arm abuts against or is spaced apart from the first wall.

[0030] By adopting the technical solution of this embodiment, the elastic member is arranged on the floating connection member, and the free end of the elastic member is away from the floating connection member and abuts against or is spaced from the first wall, so that the elastic member can generate corresponding elastic force by relying on the movement of the arm.

[0031] In some embodiments, the mounting groove further has a third wall and a fourth wall spaced apart along the length direction, the floating connector further has a limiting portion located between the third wall and the fourth wall, the elastic portion is connected to the third wall, the free end of the elastic arm faces the fourth wall and is against or spaced apart from the fourth wall, and the length direction of the mounting groove is perpendicular to the axial direction of the connecting hole.

[0032] By adopting the technical solution of this embodiment, the fourth wall, the elastic arm, the limiting portion and the third wall are sequentially arranged along the length direction of the installation groove, that is, along the other direction of the axis of the vertical connecting hole. The four cooperate to limit the movement of the floating connecting piece along the length direction, so that the floating connecting piece can be stably installed in the installation groove.

[0033] In some embodiments, the limiting portion is an elastic portion.

[0034] By adopting the technical solution of this embodiment, the limiting portion has a certain elasticity, and the limiting portion is elastically connected to the third wall, so that the floating connection can have a certain activity space in the installation groove, so that the floating connection can have the ability to float along the length direction of the installation groove. The existence of this floating ability can enable the floating connection to move and adjust its position relative to the installation groove within a certain range along the length direction.

[0035] In some embodiments, the first wall is further provided with a second groove, at least a portion of the elastic arm is embedded in the second groove, and the side wall of the second groove facing the third wall forms a fourth wall.

[0036] By adopting the technical solution of this embodiment, a second groove is set on the side wall of the installation groove, and the elastic arm is partially or completely embedded in the second groove. The setting of the second groove provides an accommodating space for the elastic arm. On the other hand, the second groove forms a fourth wall toward the side wall of the third wall, which is used to cooperate with the elastic arm to limit the movement of the floating connector.

[0037] In some embodiments, the second wall extends along the length direction of the installation groove, the first protrusion is arranged at an end of the second wall away from the third wall, and the elastic arm is arranged in the middle of the second wall.

[0038] By adopting the technical solution of this embodiment, along the axial direction of the connecting hole, on the basis of the first protrusion and the first groove cooperating to limit the movement, the elastic arm abuts against the second wall and the fourth wall in the middle part of the second wall, and can also play a certain limiting role, thereby further reducing the risk of the floating connecting part falling out along the axial direction.

[0039] In some embodiments, a third protrusion is further provided in the middle portion of the second wall along the length direction. The third protrusion is spaced apart from the elastic arm and inserted into the first groove. The third protrusion can float along the first gap in the first groove along the axial direction of the connecting hole, and float along the third gap in the first groove along the width direction of the installation groove.

[0040] By adopting the technical solution of this embodiment, a third protrusion is arranged along the length direction of the second wall and inserted into the first groove. The arrangement of the third protrusion increases the axial limitation of the floating connector in the length direction, which can reduce the risk of the floating connector escaping from the mounting groove along the axial direction of the connecting hole, and the third protrusion can float in the first groove along the first gap and the third gap. In this way, the third protrusion being inserted into the first groove will not affect the floating of the floating connector.

[0041] In some embodiments, the elastic arm is integrally formed with the floating connector.

[0042] By adopting the technical solution of this embodiment, the molding process is simple and convenient for mass production.

[0043] In some embodiments, the axial direction of the connecting hole is parallel to the height direction of the mounting groove. The mounting groove also has a fifth wall arranged below the connecting hole. The fifth wall is recessed along the height direction of the mounting groove to form a third groove. The bottom of the connecting hole is arranged opposite to the third groove.

[0044] By adopting the technical solution of this embodiment, by setting the third groove in the lower space of the connecting hole, along the axial direction of the connecting hole, when the size of the external connecting component inserted into the connecting hole is longer, the third groove provides an accommodating space for the bottom of the connecting component, thereby reducing the risk of interference between the bottom of the connecting component and the bottom of the installation groove, i.e., the fifth wall, due to the excessive size of the connecting component. This allows the floating connecting component to adapt to external connecting components of more sizes, thereby improving versatility and practicality.

[0045] In some embodiments, the floating connector is a sheet metal member.

[0046] By adopting the technical solution of this embodiment, a floating connector having a first protrusion (or a first groove), a second protrusion, an elastic arm, a limiting portion, a third protrusion, etc. is integrally stamped out through a piece of sheet metal. The floating connector has a lighter weight, does not require assembly as a whole, has better structural strength, and has better overall stability.

[0047] In a second aspect, an embodiment of the present application further provides an energy storage device, including a battery device as described in the above embodiment, and the battery device is used to store or provide electrical energy.

[0048] In a third aspect, an embodiment of the present application further provides an energy storage system, comprising a power conversion device and an energy storage device as described in the above embodiment, wherein the power conversion device is electrically connected between the power generation device and the energy storage device.

[0049] In a fourth aspect, an embodiment of the present application further provides an electrical device, comprising a battery device as described in the above embodiments, an energy storage device as described in the above embodiments, or an energy storage system as described in the above embodiments, wherein the battery device is used to store or provide electrical energy.

[0050] In a fifth aspect, an embodiment of the present application further provides a charging network, comprising a charging pile and an energy storage device as described in the above embodiment or an energy storage system as described in the above embodiment, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0051] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0053] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0054] Figure 2 A schematic diagram of the structure of a charging network in some embodiments of the present application;

[0055] Figure 3 A schematic diagram of the structure of an energy storage system in some embodiments of the present application;

[0056] Figure 4 A schematic diagram of the structure of an energy storage device in some embodiments of the present application;

[0057] Figure 5 An exploded schematic diagram of a battery device according to some embodiments of the present application;

[0058] Figure 6 for Figure 5 A schematic diagram of a partial structure of a battery device shown;

[0059] Figure 7 for Figure 6 Magnified view at A in the middle;

[0060] Figure 8 for Figure 5 An exploded view of the connecting member of the battery device shown;

[0061] Fig. 9 for Figure 5 A one-way view of the connecting member of the battery device shown;

[0062] Fig.10 for Fig. 9 Another perspective view of the connecting member shown;

[0063] Fig.11 for Fig. 9 A schematic structural diagram of a connecting body of a connecting member shown;

[0064] Fig.12 for Fig. 9 A one-way view of the floating connection of the connection member is shown;

[0065] Fig.13 for Fig.12 Another perspective view of the floating connection is shown.

[0066] Among them, the reference numerals in the figure are:

[0067] 100. vehicle; 101. controller; 102. motor;

[0068] 200. Battery device;

[0069] 300, charging network; 301, charging pile; 302, connector;

[0070] 400, energy storage system; 401, power conversion device; 402, power generation device; 403, energy storage device; 404, cabinet;

[0071] 10. Box body; 1001. Accommodation space; 11. Top cover; 12. Bottom plate; 13. Frame; 14. Copper busbar; 20. Battery cell; 30. High-voltage distribution box; 31. Relay;

[0072] 40. Connecting member; 41. Connecting body; 411. Mounting groove; 4111. First wall; 412. First groove; 4121. Second surface; 4122. Second groove; 413. First opening; 414. Second opening; 415. Third wall; 416. Fourth wall; 417. Fifth wall; 4171. Third groove; 42. Floating connector; 421. Connecting hole; 422. Second wall; 4221. Bend; 423. First protrusion; 4231. First surface; 424. First gap; 425. Second protrusion; 426. Second gap; 427. Limiting portion; 428. Third protrusion; 43. Third gap; 431. Elastic member;

[0073] 50. Connectors. DETAILED DESCRIPTION

[0074] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following Figures 1 to 13 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0076] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0077] Reference to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least some embodiments of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments in any suitable manner.

[0078] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0079] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets). "Several" means one or more than one, unless otherwise clearly and specifically defined.

[0080] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0081] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0082] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0083] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "adjacent" refers to being close in position. 1 , A 2 A and B three parts, 1 The distance between B and A is greater than that between A and B. 2 The distance between A and B, then 2 Compared with A 1 For example, A 2 Closer to B, i.e. A 2 adjacent to B, or B adjacent to A 2 For example, when there are multiple C components, the multiple C components are C 1 , C 2 ……C N , when one of the C components, such as C 2 If B is closer to component B than to other C components, then B is adjacent to C. 2 , or we can say C 2 Near B.

[0084] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development. In the manufacturing process of batteries, the reliability of batteries is an issue that cannot be ignored. Therefore, how to improve the reliability of batteries is a technical problem that needs to be solved urgently in battery technology.

[0085] Batteries usually include a box, battery cells and a high-voltage distribution box, among which the high-voltage distribution box refers to a component that should be used in the battery to control the charging and discharging of the battery, such as the battery disconnect unit (BDU). The BDU controls the charging and discharging of the battery and is a high-voltage distribution box designed specifically for batteries. The high-voltage distribution box is electrically connected to the battery cells. In batteries, busbars such as copper busbars are commonly used electrical connection components. For example, copper busbars are used to electrically connect multiple battery cells for busbars, and copper busbars are used to electrically connect battery cells and high-voltage distribution boxes (for example, copper busbars are used to electrically connect battery cells and relays in high-voltage distribution boxes). Copper bars and the like are arranged in the battery, and are connected with other components in the battery to realize electrical and mechanical connection between the copper bars and corresponding components. For example, the battery is provided with an output pole base, and the output pole base is provided with connection holes such as threaded holes, and the copper bars are provided with through holes. The copper bars are connected to the connection holes of the output pole base after passing through the through holes by bolts, etc., so as to realize connection with the output pole base. For another example, multiple battery cells inside the box body are connected to the relay in the high-voltage distribution box after being connected by copper bars. The copper bars are matched with the connection holes provided on the box body of the high-voltage distribution box through fasteners such as bolts, and the copper bars are connected to the box body of the high-voltage distribution box, thereby limiting the relative movement between the copper bars and the high-voltage distribution box, so that the copper bars can be stably and reliably connected to the relay. In this way, the connection strength and connection reliability of electrical connection components such as busbars, such as copper bars, directly affect the electrical connection strength and electrical connection reliability between electrical parts, thereby affecting the stability and reliability of battery performance.

[0086] During the transportation and use of batteries, there is a risk that the copper busbar and other connection parts may become loose or even come loose due to vibration and impact. In the related art, in order to reduce such risks, floating nuts are often used to connect the copper busbar and the like. Among them, the floating nut is a special nut with a floating structure. When the floating nut is connected to the bolt or screw, due to the existence of its floating structure, the nut can adapt to the dimensional deviation, vibration or thermal expansion and contraction between the connection structures to a certain extent, so that when subjected to external forces, it can automatically adjust its position and maintain good contact with the bolt or screw, thereby ensuring the reliability and stability of the connection. However, the floating nut is generally connected to the main body component on which the floating nut is set through a buckle structure, so that the floating nut is installed on the main body component so that it can achieve automatic position adjustment by floating relative to the main body component. The buckle structure usually relies on its own elastic deformation to achieve connection. The mechanical properties such as tension, pressure and torque it withstands are relatively low, and it is easy to break during assembly and use. In addition, as the use time increases, the buckle structure is also prone to fatigue damage, resulting in a gradual decrease in connection strength and an increased risk of loosening of the floating nut.

[0087] Based on this, an embodiment of the present application provides a battery device, whose box body is provided with a connecting component, the connecting component includes a connecting body provided with a mounting groove and a floating connecting piece installed in the mounting groove of the connecting body, a first protrusion and a first groove for concave-convex plug-in fitting are provided between the first wall and the second wall, and when the floating connecting piece is installed in the mounting groove, the first protrusion is inserted into the first groove, and the first protrusion and the first groove limit the floating connecting piece along the axial direction of the connecting hole through the concave-convex structure. Compared with using a snap-on structure, the concave-convex structure can withstand relatively greater tension, pressure, torque, etc., and the risk of deformation and breakage of the structure due to external force is reduced, thereby effectively reducing the risk of loosening of the floating connecting piece due to connection failure, and improving the installation reliability and stability of the floating connecting piece. In addition, a first gap is provided between the first protrusion and the groove wall of the first groove along the axial direction of the connecting hole. The provision of the first gap allows the floating connector to have space to float up and down along the axial direction of the connecting hole, that is, by providing the first gap, the floating connector can at least float along the axial direction of the connecting hole. When a connecting member such as a screw or a bolt is inserted and fixed to the connecting hole of the floating connector, the floating connector can automatically adjust its position along the axial direction of the connecting hole when subjected to external force, thereby adapting to dimensional deviations between related connecting components, as well as vibrations or thermal expansion and contraction during use, so that the floating connector maintains good contact with connecting members such as bolts or screws, thereby improving the strength and reliability of the connecting member connecting other structures, thereby improving the reliability of the battery device.

[0088] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0089] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0090] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0091] For the convenience of description, an electric device is provided in accordance with an embodiment of the present application, and the electric device is described by taking a vehicle as an example.

[0092] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 100 provided for some embodiments of the present application. The vehicle 100 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 200 is provided inside the vehicle 100, and the battery device 200 may be provided at the bottom, head or tail of the vehicle 100. The battery device 200 may be used to power the vehicle 100, for example, the battery device 200 may be used as an operating power source for the vehicle 100. The vehicle 100 may also include a controller 101 and a motor 102, and the controller 101 is used to control the battery device 200 to power the motor 102, for example, for starting, navigating and driving the vehicle 100.

[0093] In some embodiments, the battery device 200 can not only serve as an operating power source for the vehicle 100 , but also serve as a driving power source for the vehicle 100 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100 .

[0094] Please refer to Figure 2 The embodiment of the present application also provides a charging network 300, including a charging pile 301 and an energy storage device 403, wherein the charging pile 301 is electrically connected to the energy storage device 403, and the energy storage device 403 is used to provide electric energy to the charging pile 301, and the energy storage device 403 includes one or more battery devices 200. The charging pile 301 is electrically connected to the battery device 200 in the energy storage device 403 through a cable, and the battery device can provide its own stored electric energy to the charging pile 301. The charging pile 301 has one or more connectors 302, and the connector 302 is used to connect to an electric device (such as a vehicle), so as to replenish energy to the electric device.

[0095] The energy storage device 403 may be located inside the charging pile 301 (eg, an integrated storage and charging device), or may be located outside the charging pile 301 .

[0096] In some embodiments, the charging network 300 may include a charging pile 301 and an energy storage system 400, wherein the charging pile 301 is electrically connected to the energy storage system 400, and the energy storage system 400 is used to provide electrical energy to the charging pile 301. The charging pile 301 is electrically connected to the battery device 200 in the energy storage system 400 via a cable, and the battery device can provide the electrical energy stored in the battery device to the charging pile 301.

[0097] Please refer to Figure 3The embodiment of the present application provides an energy storage system 400, which may include one or more energy storage devices 403 and a power conversion device 401 (Power Converter System, PCS for short), wherein the power conversion device 401 is connected between a power generation device 402 and the energy storage device 403. The power generation device 402 is used to generate electric energy, and the electric energy generated by the power generation device 402 may be stored in the energy storage device 403 through the power conversion device 401. As an example, the power generation device 402 may be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device 402 is not limited in the present application.

[0098] Please refer to Figure 4 , an embodiment of the present application provides an energy storage device 403, including one or more battery clusters (Battery Cluster) to improve the voltage and capacity of the energy storage device 403. The battery cluster may include one or more battery devices 200, and the multiple battery devices are connected in series through a busbar component to increase the voltage of the energy storage device 403. When the energy storage device 403 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 403.

[0099] The energy storage device 403 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device 403 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 403 can store electrical energy when electricity consumption is low, and provide electrical energy to relevant users or electrical equipment during peak electricity consumption. The energy storage system 400 provided in the embodiment of the present application can be any power system that requires the use of the energy storage device 403.

[0100] In some embodiments, the energy storage device 403 is an energy storage cabinet. Of course, the energy storage device 403 can also be an energy storage container.

[0101] In some embodiments, the energy storage device 403 may include a cabinet 404 and one or more battery clusters, and the battery clusters are accommodated in the cabinet 404. Of course, the energy storage device 403 may also include one or more battery devices, and the battery devices are directly accommodated in the cabinet 404.

[0102] In some embodiments, the energy storage device 403 may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0103] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for regulating the temperature of the battery cells to each battery device through a pipeline.

[0104] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The main control module includes a slave battery management unit (SBMU for short), a fusion switch and other modules.

[0105] As an example, the master control module can be used as a battery management unit of the energy storage device 403 to monitor and manage the energy storage device 403. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device 403. For example, the charging and discharging current and voltage of the energy storage device 403 can be controlled. As an example, the master control module includes an insulation monitoring module (IMM), a master battery management unit (MBMU), Ethernet (ETH), and a fiber optic conversion module.

[0106] As an example, the fire protection module includes a control panel, a detector, an alarm device, etc., which are used to detect, alarm or extinguish fire in the energy storage system 400.

[0107] As an example, the power distribution module may be used to distribute power to the modules in the energy storage device 403 that require power.

[0108] Please refer to Figure 5 , an embodiment of the present application provides a battery device 200 (Battery Apparatus). The battery device 200 may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells 20, and the plurality of battery cells 20 are connected in series, in parallel, or in mixed connection through a busbar component.

[0109] In some embodiments, the battery device includes a battery management system (BMS), which is a core component responsible for monitoring and managing the status of battery cells. Its main functions include: real-time monitoring of battery cell voltage, current, temperature and other parameters to ensure that the battery is in a safe working state; balancing the power of each battery cell in the battery cell assembly by active or passive means to extend the battery life; controlling and regulating the battery cell temperature to avoid performance degradation or safety risks caused by overheating or overcooling; detecting faults of battery cell assemblies and the BMS itself, and taking corresponding protective measures, such as cutting off power supply and alarming.

[0110] As an example, the battery management system may be disposed in a box, so that the box supports and protects the battery management system.

[0111] As an example, the battery management system may also be arranged outside the box and connected to the battery cells, sensors and other devices in the box through wires.

[0112] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 20 .

[0113] As an example, the battery cell assembly may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 20 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 20 by a cable tie.

[0114] In some embodiments, the battery device 200 may be a battery pack, which includes a case 10 and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case 10 .

[0115] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body 10 by fixing the battery module in the box body 10 .

[0116] As an example, the battery cell assembly may also be accommodated in the case 10 by directly fixing the plurality of battery cells 20 to the case 10 .

[0117] In some embodiments, the box 10 has a receiving space 1001 inside to accommodate the battery cell 20. The box 10 can be made of a material with a certain hardness and strength, so that the box 10 is not easily deformed when squeezed or collided, so that the battery can have a higher structural strength and the reliability can also be improved. The box 10 can be made of a variety of materials, including but not limited to aluminum, stainless steel, aluminum alloy, iron or plastic.

[0118] In some embodiments, the box 10 may be a part of the chassis structure of the vehicle 100. For example, part of the box 10 may become at least a part of the floor of the vehicle 100, or part of the box 10 may become at least a part of the cross beam and longitudinal beam of the vehicle 100.

[0119] As an example, the box 10 may include a first box and a second box, and the first box and the second box cover each other, so that a closed accommodation space 1001 is formed inside the box 10 to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be the top cover 11 or the bottom plate 12 of the box 10. The first box and the second box can also be hollow structures with one side open, and the open side of the first box covers the open side of the second box.

[0120] As an example, the box body 10 may include a top cover 11, a frame 13 and a bottom plate 12. The top cover 11 and the bottom plate 12 are respectively connected to the frame 13, so that a closed accommodation space 1001 is formed inside the box body 10 to accommodate the battery monomer assembly.

[0121] In some embodiments, Figure 5 As shown, the battery device 200 may further include a high-voltage distribution box 30, which may be accommodated in the accommodation space 1001 of the box body 10 or may be located outside the accommodation space 1001 of the box body 10. The high-voltage distribution box 30 is electrically connected to the battery cell 20, and is used to control the charging and discharging of the battery device 200.

[0122] In some embodiments, Figure 5 and Figure 6As shown, the battery device 200 is further provided with a connecting member 40, and the connecting member 40 is connected to other structural members by providing a connecting hole 421. In some examples, the connecting member 40 is provided on the box body 10, for example, the output pole base of the box body 10 for connecting the electrical components forms a type of connecting member 40, and the output pole base is provided with an electrical connecting pole, and the electrical connecting pole is used to electrically connect with the battery cell 20 inside the box body 10 of the battery or the external components of the box body 10, wherein the electrical connecting pole is usually connected with other components by cooperating with bolts or screws, for example, when the battery cell 20 is electrically connected to the output pole base by using a busbar such as a copper busbar 14, the copper busbar 14 is provided with a through hole, and the end plate or beam of the box body 10 is provided with a conductive member with a connecting hole 421 to form the output pole base, and the connecting member 50 such as a bolt or a screw passes through the through hole of the busbar and is connected to the connecting hole 421 of the conductive member, so that the battery cell 20 is electrically connected to the corresponding conductive member, and the battery cell 20 can be electrically connected to the output pole base. In other examples, the connecting member 40 is arranged in the accommodating space 1001 of the box body 10. For example, the high-voltage distribution box 30 of the battery is provided with a component with a connecting hole 421 to form a type of connecting member 40. For example, multiple battery cells 20 inside the box body 10 are connected to the relay 31 in the high-voltage distribution box 30 after being converged using a copper bus 14. The copper bus 14 is matched with the connecting hole 421 set on the box body of the high-voltage distribution box 30 through connecting parts 50 such as bolts, and the copper bus 14 is connected to the box body of the high-voltage distribution box 30, thereby restricting the relative movement between the copper bus 14 and the high-voltage distribution box 30, so that the copper bus 14 can be stably and reliably connected to the relay 31.

[0123] Below, combined with the attached Figures 5 to 13 The battery device 200 of the present application is described in detail with reference to the specific embodiments. In the embodiment of the present application, the length direction of the mounting groove 411 is the axial direction of the connecting hole 421 as indicated by the double-headed arrow F3 in the figure, that is, the height direction of the mounting groove 411 is the direction as indicated by the double-headed arrow F1 in the figure, and the width direction of the mounting groove 411 is the direction as indicated by the double-headed arrow F2 in the figure.

[0124] See also Figures 5 to 9The embodiment of the present application provides a battery device 200, which includes a box body 10 and a battery cell 20 arranged in the box body 10. The battery device 200 is provided with a connecting member 40, and the connecting member 40 includes a connecting body 41 and a floating connecting member 42. The connecting body 41 is provided with a mounting groove 411, and the floating connecting member 42 is installed in the mounting groove 411. The floating connecting member 42 is provided with a connecting hole 421; wherein the mounting groove 411 has a first wall 4111, and the floating connecting member 42 has a second wall 422. One of the first wall 4111 and the second wall 422 is provided with a first groove 412, and the other of the first wall 4111 and the second wall 422 is provided with a first protrusion 423 inserted into the first groove 412. The first protrusion 423 is arranged at an angle relative to the axial direction of the connecting hole 421, and along the axial direction of the connecting hole 421, there is a first gap 424 between the first protrusion 423 and the groove wall of the first groove 412, so that the floating connecting member 42 can at least float along the axial direction of the connecting hole 421.

[0125] In this embodiment, the battery device 200 is provided with a connecting member 40, which means that the battery device 200 is equipped with, installed with, or contains a specific component or component for connecting other components or structures, wherein the function of the connecting member 40 may be to realize the mechanical connection or electrical connection between the component itself and other components to meet specific functional or performance requirements. In some examples, the connecting member 40 may be an electrical connector 50 with conductive ability, such as an output pole base, etc. The conductive connecting member 40 may establish a current flow path between the battery cell 20 or an external electrical component through a conductive connector 50, a line, or other conductive methods; in other examples, the connecting member 40 may be a mechanical connector, such as a member for fixing the copper bus 14, etc. to the box body 10 or the high-voltage distribution box 30, etc.

[0126] The battery device 200 is provided with a connecting member 40, which can be arranged on the box 10, or the connecting member 40 can also be arranged in the internal space of the box 10. In some examples, the connecting member 40 is arranged on the box 10, for example, the connecting member 40 can be an output pole base, the box 10 includes an end plate, the output pole base is arranged on the end plate, the output pole base includes a connecting body 41 and a floating connecting member 42, the connecting body 41 is arranged on the end plate, the floating connecting member 42 is a conductive member of the output pole base, the connecting hole 421 of the floating connecting member 42 can be a threaded hole, and the floating connecting member 42 is used to cooperate with bolts or screws to threadably connect electrical parts inside and outside the box 10. In other examples, the connecting member 40 is disposed in the accommodating space 1001 of the box body 10. For example, a high-voltage distribution box 30 is disposed in the box body 10 of the battery device 200. The high-voltage distribution box 30 includes a box body. The box body of the high-voltage distribution box 30 forms a connecting body 41 having an installation groove 411. The floating connecting member 42 is installed in the box body of the high-voltage distribution box 30. Figure 6 As shown, the connection hole 421 of the floating connector 42 can be a threaded hole, and the copper busbar 14 is connected to the floating connector 42 by bolts or screws, so that the copper busbar 14 is connected to the box body of the high-voltage distribution box 30 to limit the relative movement between the copper busbar 14 and the high-voltage distribution box 30.

[0127] In this embodiment, the floating connector 42 refers to a connector 50 that allows the connected parts to have the ability to move relative to each other within a certain range. This relative movement ability is the floating characteristic. The floating characteristic enables the floating connector 42 to automatically adapt to the unevenness, dimensional deviation or assembly error between the connected parts during installation, and to adapt to vibration, thermal expansion and contraction during use. The floating connector 42 is provided with a connection hole 421, wherein the connection hole 421 refers to a hole opened in the floating connector 42 for realizing the connection function. The function of the connection hole 421 is to allow other parts, components, connectors 50, etc. to realize mechanical connection and electrical connection with the floating connector 42 through it. Among them, when the connection hole 421 is used for mechanical connection, the connector 50 such as bolts and screws can pass through the connection hole 421 to fix different parts together; when the connection hole 421 is used for electrical connection, the connection hole 421 can be used for threading and inserting pins to realize circuit connection. In a specific embodiment, the connection hole 421 can be in various shapes such as circular, elliptical, square, etc. The specific shape depends on the requirements of the connection object and the design of the connection method. For example, if the floating connector 42 is used to connect a cylindrical rod, the connection hole 421 can be circular, and if the floating connector 42 is used to connect a screw rod, the connection hole 421 can be a screw hole, etc. Exemplarily, the connection hole 421 can be a screw hole, and the screw hole is used for connection with a threaded connector that matches it, wherein the threaded connector refers to a connector 50 with a threaded section, and the threaded section has an external thread that matches the internal thread of the threaded hole, and the threaded connector can be a bolt, a screw rod, or a screw, etc.

[0128] In some examples, the floating connector 42 can be a floating nut, which is used to connect to a connector 50 such as a bolt, a screw or a screw, and when the floating nut is connected to a connector 50 such as a bolt, due to the existence of its floating structure, the floating nut can adapt to dimensional deviations, vibrations or thermal expansion and contraction between the connection structures to a certain extent, so that when subjected to external force, it can automatically adjust its position and maintain good contact with the bolt or screw, thereby ensuring the reliability and stability of the connection.

[0129] In this embodiment, if Figures 6 to 8As shown, the floating connector 42 is installed in the installation groove 411, wherein the installation groove 411 is a specific space set on the connection body 41 and specially provided for the installation of the floating connector 42. Its shape and size match the floating connector 42 so that the floating connector 42 can be assembled therein, and the installation groove 411 has a certain limiting effect on the movement range of the floating connector 42. On the premise of ensuring that the floating connector 42 has a certain degree of freedom and can float within a certain range in the installation groove 411, the existence of the installation groove 411 can reduce the risk of the floating connector 42 moving excessively or deviating from the predetermined movement trajectory, so that the connecting member 40 can be stably and reliably connected to other external connectors 50.

[0130] In this embodiment, if Figures 6 to 8 As shown, the mounting groove 411 has a first wall 4111. The mounting groove 411 is a specific structure for mounting the floating connector 42, and may include a plurality of walls, one or more of which may be the first wall 4111. Exemplarily, the mounting groove 411 may be a rectangular parallelepiped groove, and may include a bottom wall and at least three side walls, wherein when the mounting groove 411 has one opening, it includes four side walls, and the four side walls and the bottom wall are arranged to form a space for accommodating the floating connector 42, and one or more of the bottom wall or the side walls are the first wall 4111; when the mounting groove 411 has two openings, it includes three side walls, and the three side walls and the bottom wall are arranged to form a space for accommodating the floating connector 42, and one or more of the bottom wall or the side walls are the first wall 4111.

[0131] In this embodiment, if Figures 6 to 8 As shown, the floating connection member 42 has a second wall 422, and the floating connection member 42 has a plurality of walls that are matched and connected with the mounting groove 411 or the external connection member 50, wherein one or more of the walls for matching and connecting with the mounting groove 411 may be the second wall 422. Exemplarily, the second wall 422 may be a side wall or a bottom wall of the floating connection member 42, and the side wall or the bottom wall may be arranged opposite to the first wall 4111 of the mounting groove 411, and may be matched with the first wall 4111 of the mounting groove 411, so that the floating connection member 42 may have a correct position in the mounting groove 411 and float stably.

[0132] In this embodiment, if Figures 5 to 8As shown, one of the first wall 4111 and the second wall 422 is provided with a first groove 412, that is, the first wall 4111 is provided with the first groove 412, or the second wall 422 is provided with the first groove 412, or the first wall 4111 and the second wall 422 are both provided with the first groove 412; the other of the first wall 4111 and the second wall 422 is provided with a first protrusion 423 that can be inserted into the first groove 412, that is, the first wall 4111 is provided with the first protrusion 423, or the second wall 422 is provided with the first protrusion 423, or the first wall 4111 and the second wall 422 are both provided with the first protrusion 423, and the first protrusion 423 corresponds to the first groove 412, so that one first protrusion 423 can be correspondingly inserted into one first groove 412.

[0133] The first protrusion 423 is set at an angle with the axial direction of the connection hole 421, that is, the direction of the first protrusion 423 in space is not parallel to the axial direction of the connection hole 421, that is, from a spatial perspective, the first protrusion 423 is inclined relative to the axis of the connection hole 421, and the angle can be various angles such as an acute angle, an obtuse angle or a right angle. In this way, when the first protrusion 423 is inserted into the first groove 412, the first protrusion 423 is set at an angle with the axial direction of the connection hole 421, so that the first protrusion 423 can cooperate with the first groove 412 to limit the free movement of the floating connector 42 in the axial direction of the connection hole 421 to a certain extent, reduce the risk of the floating connector 42 coming out of the mounting groove 411 along the axial direction of the connection hole 421 due to excessive movement, thereby improving the stability and reliability of the connection. Exemplarily, the first wall 4111 is provided with a first groove 412, and the second wall 422 is provided with a first protrusion 423, that is, the first groove 412 is provided on the groove wall of the mounting groove 411, and the first protrusion 423 is provided on the floating connecting piece 42. The first protrusion 423 is provided axially perpendicular to the connecting hole 421, and the first protrusion 423 is inserted into the first groove 412. Along the axial direction of the connecting port, the side walls of the mounting groove 411 located at the upper and lower parts of the first protrusion 423 can limit the up and down movement of the first protrusion 423 along the axial direction of the connecting hole 421.

[0134] In this embodiment, if Figures 7 to 9As shown, along the axial direction of the connection hole 421, there is a first gap 424 between the first protrusion 423 and the groove wall of the first groove 412, so that the floating connection member 42 can at least float along the axial direction of the connection hole 421, which means that along the axial direction of the connection hole 421, the first protrusion 423 and the groove wall of the first groove 412 are not always tightly fitted, and there is a certain spacing between the two. The existence of this spacing allows the first protrusion 423 to have a certain activity space in the first groove 412. In this way, the floating connection member 42 can have the ability to float at least in the axial direction of the connection hole 421. The existence of this floating ability can enable the floating connection member 42 to move and adjust its position relative to the installation groove 411 within a certain range, thereby realizing the functions of adapting to different working conditions, absorbing vibration, and compensating for installation errors, etc., improving the connection reliability and stability of the floating connection member 42, and reducing the influence of vibration on the connection strength.

[0135] Exemplarily, in the battery device 200, the copper busbar 14 is connected and fixed to a connecting body 41 such as a box body 10 using fasteners such as bolts. In order to reduce the impact of vibration during the movement and use of the battery device 200, and the expansion and deformation of the battery cells 20 inside the battery device 200 on the copper busbar 14, a floating connector 42 such as a floating nut and a bolt are used to fix the copper busbar 14. When the copper busbar 14 is subjected to vibration and deformation forces, the floating connector 42 can at least float in the axial direction, thereby reducing the transmission of vibration and deformation.

[0136] The battery device 200 provided in the embodiment of the present application has a box 10 provided with a connecting member 40, the connecting member 40 includes a connecting body 41 provided with a mounting groove 411 and a floating connecting member 42 installed in the mounting groove 411 of the connecting body 41, the floating connecting member 42 is provided with a connecting hole 421, the mounting groove 411 has a first wall 4111, the floating connecting member 42 has a second wall 422, a first protrusion 423 and a first groove 412 for concave-convex plug-in matching are provided between the first wall 4111 and the second wall 422, and the floating connecting member 42 is provided with a first protrusion 423 and a first groove 412 for concave-convex plug-in matching between the first wall 4111 and the second wall 422. When component 42 is installed in the installation groove 411, the first protrusion 423 is inserted into the first groove 412. The first protrusion 423 and the first groove 412 limit the floating connection component 42 along the axial direction of the connecting hole 421 through the concave-convex structure. Compared with the use of a snap-on structure, the concave-convex structure can withstand relatively greater tension, pressure and torque, etc., and the risk of deformation and breakage of the structure due to external force is reduced, thereby effectively reducing the risk of loosening of the floating connection component 42 due to connection failure, and improving the installation reliability and stability of the floating connection component 42.

[0137] In addition, a first gap 424 is provided between the first protrusion 423 and the groove wall of the first groove 412 along the axial direction of the connecting hole 421. The provision of the first gap 424 allows the floating connector 42 to have space to float up and down along the axial direction of the connecting hole 421. That is, by providing the first gap 424, the floating connector 42 can at least float along the axial direction of the connecting hole 421. When a connector 50 such as a screw or a bolt is inserted and fixed to the connecting hole 421 of the floating connector 42, when subjected to external force, the floating connector 42 can automatically adjust its position along the axial direction of the connecting hole 421, thereby adapting to dimensional deviations between related connecting components, as well as vibrations or thermal expansion and contraction during use, so that the floating connector 42 maintains good contact with the connector 50 such as a bolt or a screw, thereby improving the strength and reliability of the connecting member 40 connecting other structures, thereby improving the reliability of the battery device 200.

[0138] In some embodiments, Figures 7 to 9 As shown, the first protrusion 423 has a first surface 4231 perpendicular to the axial direction of the connecting hole 421 , the first groove 412 has a second surface 4121 perpendicular to the axial direction of the connecting hole 421 , and the first gap 424 is provided between the first surface 4231 and the second surface 4121 .

[0139] The first protrusion 423 has a first surface 4231, and the first surface 4231 is perpendicular to the axial direction of the connecting hole 421. The first groove 412 has a second surface 4121, and the second surface 4121 is perpendicular to the axial direction of the connecting hole 421. The first protrusion 423 may include one or more first surfaces 4231, and correspondingly, the first groove 412 may also include one or more second surfaces 4121. When the number of the first surface 4231 and the second surface 4121 is one, the first surface 4231 and the second surface 4121 are perpendicular to each other. A first gap 424 is formed by spacing up and down along the axial direction of the connecting hole 421. When the number of the first surface 4231 and the second surface 4121 are both multiple, the number of the first surface 4231 and the second surface 4121 is equal, and the multiple first surfaces 4231 correspond to the multiple second surfaces 4121 one by one. The corresponding first surfaces 4231 and the second surfaces 4121 are spaced up and down along the axial direction of the connecting hole 421 to form multiple first gaps 424, and the width dimensions of the multiple first gaps 424 along the axial direction of the connecting hole 421 are equal. Among them, the width dimension of the first gap 424 refers to the distance between a first surface 4231 and a corresponding second surface 4121 along the axial direction of the connecting hole 421.

[0140] In this way, the first surface 4231 and the second surface 4121 are arranged perpendicular to the axial direction of the connection hole 421, so that the direction of the gap width of the first gap 424 is in the same direction as the axial direction of the connection hole 421, and the floating connector 42 can only float in the axial direction of the connection hole 421 along the first gap 424. In this way, the width of the first gap 424 only needs to satisfy the floating of the floating connector 42 along the axial direction of the connection hole 421, which helps to simplify the design calculation of the first gap 424 and reduce the difficulty of structural design. For example, the first surface 4231 is arranged on the first protrusion 423, and the second surface 4121 is arranged on the first groove 412, and the gap width between the first surface 4231 and the second surface 4121 meets the floating requirement of the floating connector 42 along the axial direction of the connection hole 421.

[0141] In some embodiments, Figures 7 to 9 As shown, the first groove 412 is recessed in a direction perpendicular to the axial direction of the connecting hole 421, and the first protrusion 423 protrudes in a direction perpendicular to the axial direction of the connecting hole 421; the first protrusion 423 is arranged with two surfaces facing each other along the axial direction of the connecting hole 421 to form two first surfaces 4231, and the first groove 412 is arranged with two side surfaces opposite to each other along the axial direction of the connecting hole 421 to form two second surfaces 4121.

[0142] The first groove 412 and the first protrusion 423 are recessed and protruded in a direction perpendicular to the axial direction of the connecting hole 421. From a spatial perspective, the extension direction of the first groove 412 and the first protrusion 423 is at right angles to the axis of the connecting hole 421, and the first protrusion 423 is inserted into the first groove 412 along the axial direction of the connecting hole 421. On the one hand, the first groove 412 cooperates with the first protrusion 423 to limit the axial movement of the floating connector 42 along the connecting hole 421, so that the first protrusion 423 can only float in the first groove 412 through the first gap 424 and is difficult to escape. The mutual cooperation between the first groove 412 and the first protrusion 423 can increase the contact area between the components, improve the strength and rigidity of the connection, and thus effectively reduce the risk of the floating connector 42 escaping from the mounting groove 411 along the axial direction of the connecting hole 421. At the same time, it can also share part of the load and reduce the stress concentration at the connecting part, thereby reducing the stress fatigue of the floating connector 42 and extending the service life of the floating connector 42. On the other hand, the first protrusion 423 along the connecting hole 42 1, two surfaces are arranged opposite to each other in the axial direction to form two first surfaces 4231, that is, the upper surface and the lower surface of the first protrusion 423 along the axial direction of the connecting hole 421 are both the first surface 4231, and the two side surfaces of the first groove 412 arranged opposite to each other in the axial direction of the connecting hole 421 form two first surfaces 4231, that is, the upper side surface and the lower side surface of the first groove 412 along the axial direction of the connecting hole 421 are both the second surface 4121, and along the axial direction of the connecting hole 421, the first gap 424 is arranged between the upper and lower side surfaces of the first groove 412 and the upper and lower surfaces of the first protrusion 423, and the first gap 424 that meets the use requirements can be obtained by designing the dimensions of the first protrusion 423 and the first groove 412 along the axial direction of the connecting hole 421, and the structural design is simple and practical.

[0143] In this embodiment, it can be understood that Figures 7 to 9 As shown, the first gap 424 is the gap between the upper (lower) surface of the first protrusion 423 and the upper (lower) side surface of the corresponding first groove 412. Specifically, when the floating connector 42 floats downward along the axial direction of the connecting hole 421 until the lower surface of the first protrusion 423 is in contact with the lower side surface of the first groove 412, the first gap 424 is the gap between the upper surface of the first protrusion 423 and the upper side surface of the first groove 412. When the floating connector 42 floats upward along the axial direction of the connecting hole 421 until the lower surface of the first protrusion 423 is in contact with the lower side surface of the first groove 412, the first gap 424 is the gap between the upper surface of the first protrusion 423 and the upper side surface of the first groove 412. 3 is fitted with the upper side of the first groove 412, the first gap 424 is the gap between the lower surface of the first protrusion 423 and the lower side of the first groove 412. When the floating connector 42 floats along the axial direction of the connecting hole 421 so that the first protrusion 423 is suspended in the first groove 412, the gap between the upper surface of the first protrusion 423 and the upper side of the first groove 412, and the gap between the lower surface of the first protrusion 423 and the lower side of the first groove 412 are both the first gap 424.

[0144] When designing the width of the first gap 424, according to the requirement of the floating distance of the floating connector 42 along the axial direction of the connecting hole 421, the size of the first gap 424 when the lower surface of the first protrusion 423 fits with the lower side of the first groove 412 is equal to the size of the first gap 424 when the upper surface of the first protrusion 423 fits with the upper side of the first groove 412, and is equal to the sum of the gap between the upper surface of the first protrusion 423 and the upper side of the first groove 412 and the gap between the lower surface of the first protrusion 423 and the lower side of the first groove 412 when the first protrusion 423 is suspended in the first groove 412. The width of the first gap 424 is determined by the floating distance of the floating connector 42 along the axial direction of the connecting hole 421. Exemplarily, when the floating connector 42 of the present embodiment is used to fix the copper busbar 14, the copper busbar 14 is arranged above the connection body 41 along the axial direction of the connection hole 421, and the size of the first gap 424 is designed by the distance between the copper busbar 14 and the connection body 41. For example, the size of the first gap 424 is equal to the spacing distance between the copper busbar 14 and the connection body 41.

[0145] In other embodiments, Figures 7 to 9 As shown, the mounting groove 411 also has a first opening 413 for the floating connector 42 to fit in and fit into. The plane where the first opening 413 is located is parallel to the axis of the connecting hole 421 . The first wall 4111 is provided with a first groove 412 , and one end of the first groove 412 provided on the first wall 4111 passes through the first opening 413 .

[0146] The mounting groove 411 also has a first opening 413, which constitutes a part of the mounting groove 411 and provides an entrance for the installation of the floating connector 42. The plane where the first opening 413 is located is parallel to the axis of the connection hole 421. For example, the mounting groove 411 can be a rectangular parallelepiped groove provided on the connection body 41. The first opening 413 is located on the side wall of the connection body 41, that is, the first opening 413 is formed at the side opening of the mounting groove 411. The floating connector 42 is installed into the mounting groove 411 from the side of the mounting groove 411. The first opening 413 in which the floating connector 42 is adapted to be embedded means that the size and shape of the floating connector 42 match the first opening 413 so that it can be smoothly embedded into the mounting groove 411 through the first opening 413.

[0147] The first wall 4111 is provided with a first groove 412, that is, the groove wall of the installation groove 411 is provided with a first groove 412, and the second wall 422, that is, the floating connection member 42 is provided with a first protrusion 423 at a position corresponding to the first groove 412, and one end of the first groove 412 provided on the first wall 4111 passes through the first opening 413. In this way, when the floating connection member 42 is inserted from the first opening 413, the first protrusion 423 can cooperate with the first groove 412 to guide the floating connection member 42 to move, so that the floating connection member 42 can be quickly and smoothly inserted into the installation groove 411.

[0148] It can be understood that in this embodiment, the first wall 4111 is provided with the first groove 412 means that the first groove 412 can be only provided on the first wall 4111 , or the first groove 412 can be provided on both the first wall 4111 and the second wall 422 .

[0149] In other embodiments, Figures 6 to 9 As shown, the mounting groove 411 has two first walls 4111 arranged opposite to each other along the width direction of the first opening 413, and the two first walls 4111 are each provided with a first groove 412. The floating connecting member 42 has two second walls 422, and the positions of the two second walls 422 corresponding to the first groove 412 are each provided with a first protrusion 423, and the width direction of the first opening 413 is perpendicular to the axial direction of the connecting hole 421.

[0150] In this way, first protrusions 423 are respectively arranged on the opposite sides of the width direction of the first opening 413 to cooperate with the first groove 412 to support and guide the installation of the floating connection member 42, thereby further improving the assembly efficiency and assembly accuracy of the floating connection member 42 and the installation groove 411; and, first grooves 412 are respectively arranged on the opposite sides of the width direction of the first opening 413, that is, first grooves 412 are respectively arranged on the opposite sides of the installation groove 411, and correspondingly, first protrusions 423 are respectively arranged on the opposite sides of the floating connection member 42, and first gaps 424 are formed on the opposite sides of the floating connection member 42 along the axial direction of the vertical connection hole 421, which helps to improve the floating balance of the floating connection member 42 and improve the uniformity of the force during the floating process.

[0151] In a specific embodiment, the installation groove 411 has two side walls arranged opposite to each other in the width direction, the two side walls form two first walls 4111, and are provided with a first groove 412. The floating connector 42 has two side walls arranged opposite to each other in the width direction, the two side walls form two second walls 422, and are provided with a first protrusion 423. The width direction of the installation groove 411, the width direction of the floating connector 42, and the width direction of the first opening 413 are in the same direction.

[0152] In other embodiments, Figures 7 to 9As shown, the mounting groove 411 further has a second opening 414 . The plane where the second opening 414 is located is arranged at an angle with the axis of the connecting hole 421 . The opening of the connecting hole 421 passes through the second opening 414 .

[0153] The mounting groove 411 also has a second opening 414, which constitutes a part of the mounting groove 411. When the floating connector 42 is installed in the mounting groove 411, the connecting hole 421 of the floating connector 42 is connected to the external environment through the second opening 414, so that the external connector 50 can be inserted into the connecting hole 421 and connected to the floating connector 42.

[0154] The plane where the second opening 414 is located is set at an angle to the axis of the connecting hole 421, that is, the direction of the plane where the second opening 414 is located in space is not parallel to the axial direction of the connecting hole 421, that is, from a spatial perspective, the plane where the second opening 414 is located is inclined relative to the axis of the connecting hole 421, and the angle can be an acute angle, an obtuse angle, or a right angle. For example, the mounting groove 411 can be a rectangular parallelepiped groove provided in the connecting body 41, and the second opening 414 is located on the top wall of the connecting body 41 facing the copper bar 14, that is, the second opening 414 is formed by opening the top surface of the mounting groove 411, and when the floating connector 42 is installed in the mounting groove 411, the orifice of its connecting hole 421 is located on the top wall of the connecting body 41.

[0155] In other embodiments, Figures 8 to 10 As shown, the floating connector 42 is further provided with a second protrusion 425 , and along the axial direction of the connecting hole 421 , the second protrusion 425 has a second gap 426 above the second opening 414 and between the edge of the second opening 414 , and the maximum width dimension of the second gap 426 is equal to the maximum width dimension of the first gap 424 .

[0156] In this way, when the floating connector 42 is installed in the installation groove 411, it also has a second protrusion 425 located above the installation groove 411 along the axial direction of the connection hole 421, that is, the second protrusion 425 is located in the upper space of the first protrusion 423, and the second protrusion 425 can cooperate with the wall surface of the connection body 41 to support and guide the floating connector 42. In addition, there is a second gap 426 between the second protrusion 425 and the edge of the second opening 414 of the installation groove 411, and the maximum width of the second gap 426 is greater than or equal to the maximum width of the first gap 424. Width dimension, the setting of the second protrusion 425 will not affect the floating of the floating connector 42 along the first gap 424, wherein, since the floating connector 42 floats up and down in the mounting groove 411 along the axial direction of the connecting hole 421, the maximum width dimension of the first gap 424 refers to the maximum distance between the first surface 4231 and the second surface 4121 adjacent to the axial direction of the connecting hole 421, and the maximum width dimension of the second gap 426 refers to the maximum distance between the second protrusion 425 toward the bottom surface of the connecting hole 421 and the edge of the second opening 414 along the axial direction of the connecting hole 421.

[0157] In other embodiments, Figure 8 , Fig. 9 and Fig.10 As shown, the two side walls of the mounting groove 411 that are relatively arranged along the width direction form two first walls 4111, and the two side walls of the floating connection member 42 along the width direction form two second walls 422. There is a third gap 43 between the adjacent first walls 4111 and the second walls 422, so that the floating connection member 42 can float along the width direction of the mounting groove 411, and the width direction of the mounting groove 411 is perpendicular to the axial direction of the connecting hole 421.

[0158] In this embodiment, there is a third gap 43 between the adjacent first wall 4111 and the second wall 422, so that the floating connector 42 can float along the width direction of the installation groove 411, which means that along the width direction of the installation groove 411, that is, along the direction perpendicular to the axis of the connection hole 421, the first wall 4111 and the second wall 422 are not always tightly fitted, and there is a certain spacing between them. The existence of the spacing can make the floating connector 42 embed into the installation groove 411 more quickly, and on the other hand, it can also make the floating connector 42 have a certain activity space in the installation groove 411 along the width direction, so that the floating connector 42 can have the floating ability along the width direction of the installation groove 411. The existence of the floating ability can make the floating connector 42 move and adjust its position relative to the installation groove 411 within a certain range along the width direction, so as to achieve the functions of adapting to different working conditions, absorbing vibration, and compensating for installation errors, etc., improve the connection reliability and stability of the floating connector 42, and reduce the influence of vibration on the connection strength.

[0159] It can be understood that in other embodiments, when the floating connector 42 does not need to float in the width direction, the first wall 4111 can always remain in contact with the second wall 422, so that the floating connector 42 can only float along the axial direction of the connecting hole 421 when installed in the mounting groove 411.

[0160] In this embodiment, if Figure 7 , Figure 8 and Fig. 9 As shown, an elastic member 431 is provided between the adjacent first wall 4111 and the second wall 422, one end of the elastic member 431 is connected to one of the adjacent first wall 4111 and the second wall 422, and the other opposite end of the elastic member 431 is connected to the other of the adjacent first wall 4111 and the second wall 422, or the other opposite end of the elastic member 431 is spaced from the other of the adjacent first wall 4111 and the second wall 422.

[0161] In a specific embodiment, one end of the elastic member 431 is connected to the first wall 4111, and the other opposite end of the elastic member 431 is connected to or spaced from the second wall 422 adjacent to the first wall 4111, that is, one end of the elastic member 431 is connected to the mounting groove 411; or, one end of the elastic member 431 is connected to the second wall 422, and the other opposite end of the elastic member 431 is connected to or spaced from the first wall 4111 adjacent to the second wall 422, that is, one end of the elastic member 431 is connected to the floating connection member 42.

[0162] In this way, the elastic member 431 is elastically connected between the adjacent first wall 4111 and the second wall 422 along the width direction of the mounting groove 411. The elastic member 431 has the ability to undergo elastic deformation along the width direction of the mounting groove 411. The elastic member 431 can connect the first wall 4111 and the second wall 422, so that the floating connection member 42 can be more stably and reliably installed in the mounting groove 411. The elastic member 431 can also play a role in buffering and vibration reduction. The elastic member 431 can absorb vibration, impact, etc., and reduce the influence of external force on the first wall 4111 and the second wall 422 and the connection structure. In addition, the existence of the elastic member 431 can also allow the floating connection member 42 to float along the second gap 426.

[0163] In this embodiment, if Figure 7 , Fig.10 and Fig.12 As shown, the elastic member 431 is an elastic arm protruding from the surface of the second wall 422 , and the free end of the elastic arm abuts against or is spaced apart from the first wall 4111 .

[0164] In this way, the elastic member 431 is disposed on the floating connection member 42 , and the free end of the elastic member 431 is away from the floating connection member 42 and abuts against or is spaced from the first wall 4111 , so that the elastic member 431 can generate corresponding elastic force by moving the arm.

[0165] In a specific embodiment, the elastic member 431 can be integrally formed with the floating connector 42, and the molding process is simple and convenient for mass production. In particular, integral molding refers to the use of casting, stamping, forging and other processes to integrally manufacture the floating connector 42.

[0166] It can be understood that in other embodiments, the elastic member 431 may be a separate member disposed in the second gap 426 , for example, the elastic member 431 may be a cylindrical spring, a torsion spring, a rubber pad, etc.

[0167] In other embodiments, Figure 8 , Fig.10 and Fig.13 As shown, the mounting groove 411 also has a third wall 415 and a fourth wall 416 spaced apart along the length direction, and the floating connection member 42 also has a limiting portion 427 located between the third wall 415 and the fourth wall 416, the limiting portion 427 is connected to the third wall 415, the free end of the elastic arm faces the fourth wall 416 and is against or spaced apart from the fourth wall 416, and the length direction of the mounting groove 411 is perpendicular to the axial direction of the connecting hole 421.

[0168] The mounting groove 411 has a third wall 415, and one or more of the multiple walls of the mounting groove 411 may be the third wall 415. Exemplarily, the mounting groove 411 may be a groove in the shape of a rectangular parallelepiped, which may include a bottom wall and at least three side walls, wherein when the mounting groove 411 has a first opening 413 and a second opening 414, it includes three side walls, and the three side walls and a bottom wall are arranged to form a space for accommodating the floating connector 42, and when the two side walls arranged opposite to each other in the width direction are the first walls 4111, the other side wall may be the third wall 415, and the third wall 415 is connected between the two first walls 4111. The mounting groove 411 also has a fourth wall 416, which is arranged spaced apart from the third wall 415 along the length direction of the mounting groove 411, for example, the fourth wall 416 may be a wall of a structure arranged on the first wall 4111.

[0169] The floating connector 42 also has a limiting portion 427, which is connected to the third wall 415 and is located between the third wall 415 and the fourth wall 416. The free end of the elastic arm faces the fourth wall 416 and abuts against or is spaced from the fourth wall 416. In this way, along the length direction of the installation slot 411, that is, along another direction perpendicular to the axial direction of the connection hole 421, the fourth wall 416, the elastic arm, the limiting portion 427 and the third wall 415 are sequentially arranged, and the four cooperate to limit the movement of the floating connector 42 along the length direction, so that the floating connector 42 is stably installed in the installation slot 411. The limiting portion 427 is connected to the third wall 415, which means that the limiting portion 427 can abut against the third wall 415, or the limiting portion 427 can also be directly connected to the third wall 415.

[0170] In other embodiments, Figure 8 , Fig.10 and Fig.13 As shown, the limiting portion 427 is an elastic portion, which has a certain elasticity and can be elastically deformed along the length direction of the installation groove 411. In this way, the floating connection member 42 can have a certain activity space in the installation groove 411, so that the floating connection member 42 can have the floating ability along the length direction of the installation groove 411. The existence of this floating ability can enable the floating connection member 42 to move and adjust its position relative to the installation groove 411 within a certain range along the length direction.

[0171] In other embodiments, the limiting portion 427 is connected to the third wall 415 at the middle of the width direction of the installation slot 411. That is, the limiting portion 427 is provided at the middle of the floating connector 42 along the width direction to balance the left and right forces of the floating connector 42 and improve the stability of the floating connector 42 when floating. Alternatively, two limiting portions 427 are provided, and the two limiting portions 427 are respectively connected to the third wall 415 at both sides of the width direction of the installation slot 411, so that the left and right forces of the floating connector 42 can also be balanced.

[0172] In other embodiments, Figure 7 , Fig.10 and Fig.13 As shown, the first wall 4111 is further provided with a second groove 4122 , and at least a portion of the elastic arm is embedded in the second groove 4122 . The side wall of the second groove 4122 facing the third wall 415 forms a fourth wall 416 .

[0173] In this way, a second groove 4122 is set on the side wall of the installation groove 411, and the elastic arm is partially or completely embedded in the second groove 4122. The setting of the second groove 4122 provides an accommodating space for the elastic arm. The second groove 4122 forms a fourth wall 416 on the side wall facing the third wall 415, which is used to cooperate with the elastic arm to limit the movement of the floating connector 42.

[0174] In other embodiments, Figure 7 , Fig.10 and Fig.13 As shown, the second wall 422 extends along the length direction of the mounting groove 411 , the first protrusion 423 is disposed at one end of the second wall 422 away from the third wall 415 , and the elastic arm is disposed at the middle of the second wall 422 .

[0175] In this way, along the axial direction of the connecting hole 421, on the basis of the first protrusion 423 cooperating with the first groove 412 to limit the movement, the elastic arm abuts against the second wall 422 and the fourth wall 416 in the middle part of the second wall 422, and can also play a certain limiting role, thereby further reducing the risk of the floating connecting piece 42 falling out along the axial direction.

[0176] In some embodiments, Figure 8 , Fig.12 and Fig.13 As shown, a third protrusion 428 is further provided in the middle portion of the second wall 422 along the length direction. The third protrusion 428 is spaced apart from the elastic arm and inserted into the first groove 412. The third protrusion 428 can float along the first gap 424 in the first groove 412 along the axial direction of the connecting hole 421, and float along the third gap 43 in the first groove 412 along the width direction of the mounting groove 411.

[0177] In this way, a third protrusion 428 is arranged along the length direction of the second wall 422 and is inserted into the first groove 412. The arrangement of the third protrusion 428 increases the axial limitation of the floating connection member 42 in the length direction, which can further reduce the risk of the floating connection member 42 axially escaping from the mounting groove 411 along the connecting hole 421. Moreover, the third protrusion 428 can float in the first groove 412 along the first gap 424 and the third gap 43. In this way, the third protrusion 428 is inserted into the first groove 412 without affecting the normal floating of the floating connection member 42.

[0178] In other embodiments, Figure 7 , Figure 8 and Fig.11 As shown, the axial direction of the connecting hole 421 is parallel to the height direction of the mounting groove 411. The mounting groove 411 also has a fifth wall 417 arranged below the connecting hole 421. The fifth wall 417 is recessed along the height direction of the mounting groove 411 to form a third groove 4171. The bottom of the connecting hole 421 is arranged opposite to the third groove 4171.

[0179] In this way, by setting the third groove 4171 in the lower space of the connecting hole 421, along the axial direction of the connecting hole 421, when the size of the external connecting component 50 inserted into the connecting hole 421 is longer, the third groove 4171 provides an accommodating space for the bottom of the connecting component 50, thereby reducing the risk of interference between the bottom of the connecting component 50 and the bottom of the mounting groove 411, i.e., the fifth wall 417, due to the excessive size of the connecting component 50. This allows the floating connecting component 42 to adapt to external connecting components 50 of more sizes, thereby improving versatility and practicality.

[0180] In other embodiments, Fig.12 and Fig.13 As shown, the floating connector 42 is a sheet metal component.

[0181] In this embodiment, a floating connector 42 having a first protrusion 423 (or a first groove 412), a second protrusion 425, an elastic arm, a limiting portion 427, a third protrusion 428, etc. is integrally stamped out from a sheet metal part. The floating connector 42 has a lighter weight, does not require assembly as a whole, has better structural strength, and has better overall stability.

[0182] In a specific embodiment, Figure 7 , Fig.12 and Fig.13 As shown, the width direction and length direction of the floating connection member 42 are perpendicular to the axial direction of the connection hole 421, and the two side walls of the floating connection member 42 along the width direction form two second walls 422. At one end of the floating connection member 42 along the length direction, one end of the two second walls 422 and the portion connected between the two second walls 422 are bent downward along the axial direction of the connection hole 421 away from the opening of the connection hole 421 to form an integral bending portion 4221. The bending portion 4221 continues to extend at both ends along the width direction to form two first protrusions 423. The first protrusion 423 can also continue to bend and extend along the length direction of the floating connection member 42 toward the end of the first wall 4111, thereby increasing the size of the structure where the first protrusion extends into the first groove 412. Elastic arms are formed by local stamping on both sides of the floating connector 42 in the width direction. After stamping, the stamped portion is bent downward along the axial direction of the connecting hole 421 away from the opening of the connecting hole 421, and then bent away from the connecting hole 421 and extended to form a third protrusion 428, and the elastic arm is located at the side of the first wall 4111. A stopper 427 is formed at the other end of the floating connector 42 away from the first protrusion 423 in the length direction. Specifically, at the other end of the floating connector 42 in the length direction, the other end portions of the two second walls 422 and the portion connected between the second walls 422 are bent downward along the axial direction of the connecting hole 421 away from the opening of the connecting hole 421 to form an integral stopper 427.

[0183] Please also read Figures 5 to 13An embodiment of the present application provides a battery device 200. The battery device 200 of this embodiment includes a box body 10 and a battery cell 20 arranged in the box body 10. The box body 10 is provided with a connecting member 40. The connecting member 40 includes a connecting body 41 and a floating connecting member 42. The connecting body 41 is provided with a mounting groove 411. The floating connecting member 42 is installed in the mounting groove 411. The floating connecting member 42 is a stamped sheet metal part. The floating connecting member 42 is provided with a connecting hole 421. The connecting hole 421 is The mounting groove 411 is a rectangular parallelepiped groove provided on the connecting body 41. The mounting groove 411 has a first opening 413 provided on the side of the connecting body 41. The first opening 413 is used for the floating connector 42 to be embedded in the mounting groove 411. The mounting groove 411 also has a second opening 414 provided on the top of the connecting body 41 facing the copper bar 14. The connecting hole 421 of the floating connector 42 passes through the second opening 414. The plane where the second opening 414 is located is perpendicular to the axial direction of the connecting hole 421. The width direction and length direction of the mounting groove 411 are respectively perpendicular to the axial direction of the connecting hole 421, and the height direction of the mounting groove 411 is parallel to the axial direction of the connecting hole 421. The two side walls of the mounting groove 411 along the width direction form two first walls 4111, and the first wall 4111 is concavely provided with a first groove 412 along the width direction. The side wall of the floating connecting member 42 that is opposite to the side wall of the mounting groove 411 forms a second wall 422, and the second wall 422 is provided with a first protrusion 423. The upper surface of the first protrusion 423 along the height direction is The upper and lower surfaces of the first groove 412 and the lower surface are perpendicular to the axial direction of the connecting hole 421, the side surface of the first groove 412 and the upper surface of the first protrusion 423 are opposite to each other, and the side surface of the first groove 412 and the lower surface of the first protrusion 423 are opposite to each other, both of which are perpendicular to the axial direction of the connecting hole 421. The gap between the upper and lower surfaces of the first protrusion 423 and the corresponding upper and lower side surfaces of the first groove 412 forms a first gap 424, so that the floating connector 42 can float in the mounting groove 411 along the axial direction of the connecting hole 421.

[0184] The first groove 412 is connected with the first opening 413 along the length direction of the installation groove 411, so that the first protrusion 423 can cooperate with the first groove 412 to support and guide the installation of the floating connection member 42. The floating connection member 42 is also provided with a second protrusion 425. Along the axial direction of the connection hole 421, the second protrusion 425 has a second gap 426 between the upper part of the second opening 414 and the edge of the second opening 414. The maximum width dimension of the second gap 426 is equal to the maximum width dimension of the first gap 424. A third gap 43 is also provided between the side wall of the installation groove 411, i.e., the first wall 4111, and the corresponding side wall of the floating connection member 42, i.e., the second wall 422, so that the floating connection member 42 can float along the width direction of the installation groove 411. The side wall of the floating connection member 42 is integrally formed with an elastic arm, and the free end of the elastic arm abuts against the side wall (i.e., the first wall 4111) of the adjacent mounting groove 411. The middle part of the side wall of the mounting groove 411 is also provided with a second groove 4122. The elastic arm is arranged in the middle part of the side wall (i.e., the second wall 422) of the floating connection member 42 and is received in the second groove 4122. The mounting groove 411 and the first opening 413 are arranged opposite to the side wall to form a third wall 415. The floating connection member 42 is provided with an elastic limiting portion 427 at the middle position of the third wall 415. The limiting portion 427 abuts against the third wall 415, and the free end of the elastic arm abuts against the side wall of the second groove 4122 toward the third wall 415 (i.e., the fourth wall 416). The fourth wall 416, the elastic arm, the limiting portion 427 and the third wall 415 cooperate to limit the movement of the floating connection member 42 along the length direction. By setting the limiting portion 427 to have a certain elasticity, the floating connection member 42 can have a certain activity space in the installation groove 411, thereby enabling the floating connection member 42 to have the ability to float along the length direction of the installation groove 411.

[0185] A third protrusion 428 is further provided in the middle of the second wall 422 along the length direction. The third protrusion 428 is spaced below the elastic arm along the axial direction of the connecting hole 421. The third protrusion 428 is inserted into the first groove 412. The third protrusion 428 can float along the first gap 424 in the first groove 412 along the axial direction of the connecting hole 421, and float along the third gap 43 in the first groove 412 along the width direction of the mounting groove 411. A third groove 4171 is further provided on the bottom wall of the mounting groove 411 facing the second opening 414. The notch of the third groove 4171 faces the bottom of the connecting hole 421. Along the axial direction of the connecting hole 421, when the size of the external connecting member 50 inserted into the connecting hole 421 is longer, the third groove 4171 provides an accommodating space for the bottom of the connecting member 50.

[0186] Another embodiment of the present application further provides an energy storage device 403, comprising the battery device 200 provided in any of the above embodiments, and the battery device 200 is used to store or provide electrical energy.

[0187] The energy storage device 403 of the embodiment of the present application includes the above-mentioned battery device 200, and therefore at least includes all the beneficial effects of the above-mentioned battery device 200, which will not be described in detail here.

[0188] Another embodiment of the present application further provides an energy storage system 400 , including a power conversion device 401 and an energy storage device 403 as provided in the above embodiment, wherein the power conversion device 401 is electrically connected between a power generation device 402 and the energy storage device 403 .

[0189] Another embodiment of the present application further provides an electrical device, including a battery device as provided in any of the above embodiments, an energy storage device 403 provided in the above embodiments, or an energy storage system 400 provided in the above embodiments, wherein the battery device 200 is used to store or provide electrical energy.

[0190] Another embodiment of the present application further provides a charging network 300 , including a charging pile 301 and an energy storage device 403 provided in the above embodiment or an energy storage system 400 provided in the above embodiment, wherein the energy storage device 403 is used to provide electrical energy to the charging pile 301 .

[0191] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0192] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. 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. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, comprising a box and a battery cell arranged in the box, characterized in that: The battery device is provided with a connecting member, and the connecting member comprises: The connecting body is provided with a mounting groove; A floating connector, installed in the installation groove, wherein the floating connector is provided with a connection hole; Wherein, the mounting groove has a first wall, the floating connector has a second wall, one of the first wall and the second wall is provided with a first groove, the other of the first wall and the second wall is provided with a first protrusion inserted into the first groove, the first protrusion is arranged at an angle with the axial direction of the connecting hole, and along the axial direction of the connecting hole, there is a first gap between the first protrusion and the groove wall of the first groove, so that the floating connector can at least float along the axial direction of the connecting hole.

2. The battery device according to claim 1, characterized in that: The first protrusion has a first surface perpendicular to the axial direction of the connecting hole, the first groove has a second surface perpendicular to the axial direction of the connecting hole, and the first gap is provided between the first surface and the second surface.

3. The battery device according to claim 2, characterized in that: The first groove is sunken in a direction perpendicular to the axial direction of the connecting hole, and the first protrusion is protruded in a direction perpendicular to the axial direction of the connecting hole; The first protrusion has two surfaces disposed opposite to each other in the axial direction of the connecting hole to form two first surfaces, and the first groove has two side surfaces disposed opposite to each other in the axial direction of the connecting hole to form two second surfaces.

4. The battery device according to claim 1, characterized in that: The mounting groove also has a first opening for the floating connector to fit in and be embedded in. The plane where the first opening is located is parallel to the axis of the connecting hole. The first wall is provided with the first groove, and one end of the first groove provided on the first wall passes through the first opening.

5. The battery device according to claim 4, characterized in that: The mounting groove has two first walls arranged opposite to each other along the width direction of the first opening, and the two first walls are each provided with the first groove. The floating connecting member has two second walls, and the two second walls are each provided with the first protrusion at a position corresponding to the first groove. The width direction of the first opening is perpendicular to the axial direction of the connecting hole.

6. The battery device according to claim 1, characterized in that: The mounting groove further has a second opening, a plane where the second opening is located is arranged at an angle with the axis of the connecting hole, and the opening of the connecting hole passes through the second opening.

7. The battery device according to claim 6, characterized in that: The floating connector is further provided with a second protrusion, and along the axial direction of the connecting hole, the second protrusion has a second gap between the upper side of the second opening and the edge of the second opening, and the maximum width of the second gap is greater than or equal to the maximum width of the first gap.

8. The battery device according to any one of claims 1 to 7, characterized in that: The two side walls of the mounting groove that are opposite to each other along the width direction form two first walls, and the two side walls of the floating connection piece along the width direction form two second walls. A third gap is provided between adjacent first walls and second walls so that the floating connection piece can float along the width direction of the mounting groove, and the width direction of the mounting groove is perpendicular to the axial direction of the connecting hole.

9. The battery device according to claim 8, characterized in that: An elastic member is provided between the adjacent first wall and the second wall, one end of the elastic member is connected to one of the adjacent first wall and the second wall, and the other opposite end of the elastic member is connected to or spaced from the other of the adjacent first wall and the second wall.

10. The battery device according to claim 9, characterized in that: The elastic member is an elastic arm protruding from the surface of the second wall, and the free end of the elastic arm is in contact with or spaced apart from the first wall.

11. The battery device according to claim 10, characterized in that: The mounting groove also has a third wall and a fourth wall spaced apart along the length direction, and the floating connection piece also has a limiting portion located between the third wall and the fourth wall, the limiting portion is connected to the third wall, the free end of the elastic arm faces the fourth wall and is against or spaced apart from the fourth wall, and the length direction of the mounting groove is perpendicular to the axial direction of the connecting hole.

12. The battery device according to claim 11, characterized in that: The limiting portion is an elastic portion.

13. The battery device according to claim 11, characterized in that: The first wall is further provided with a second groove, in which at least a portion of the elastic arm is embedded, and the side wall of the second groove facing the third wall forms the fourth wall.

14. The battery device according to claim 11, characterized in that: The second wall extends along the length direction of the mounting groove, the first protrusion is arranged at an end of the second wall away from the third wall, and the elastic arm is arranged in the middle of the second wall.

15. The battery device according to claim 14, characterized in that: A third protrusion is also provided in the middle part of the second wall along the length direction. The third protrusion is spaced apart from the elastic arm and inserted into the first groove. The third protrusion can float along the first gap in the first groove along the axial direction of the connecting hole, and float along the third gap in the first groove along the width direction of the installation groove.

16. The battery device according to claim 10, characterized in that: The elastic arm is integrally formed with the floating connection piece.

17. The battery device according to any one of claims 1 to 7, characterized in that: The axial direction of the connecting hole is parallel to the height direction of the mounting groove. The mounting groove also has a fifth wall arranged below the connecting hole. The fifth wall is recessed along the height direction of the mounting groove to form a third groove. The bottom of the connecting hole is arranged opposite to the third groove.

18. The battery device according to any one of claims 1 to 7, characterized in that: The floating connection piece is a sheet metal piece.

19. An energy storage device, characterized in that: It comprises a plurality of battery devices as described in any one of claims 1 to 18, wherein the battery devices are used to store or provide electrical energy.

20. An energy storage system, characterized in that: It comprises a power conversion device and the energy storage device as claimed in claim 19, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

21. An electrical device, characterized in that: It comprises the battery device according to any one of claims 1 to 18, the energy storage device according to claim 19 or the energy storage system according to claim 20, wherein the battery device is used to store or provide electrical energy.

22. A charging network, characterized in that: It comprises a charging pile and the energy storage device according to claim 19 or the energy storage system according to claim 20, wherein the energy storage device is used to provide electrical energy for the charging pile.

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