Battery devices and electrical equipment

Abstract

The present application discloses a battery device and an electrical equipment, which relates to the field of battery technology, wherein the battery device includes a box body and a battery cell, the battery cell is arranged in the box body, a mounting structure is arranged on the box body, the mounting structure includes a mounting beam and a bushing, the mounting beam includes two beam walls opposite to each other in a first direction, each beam wall is provided with a through hole, the two through holes are arranged in a first direction, and at least one of the two beam walls is set as the first beam wall; the bushing is connected to the mounting beam through a transition structure, the bushing is penetrated through the two through holes at both ends of the first direction, and the bushing is at least spaced apart from the first beam wall at the through hole. The technical solution provided by the present application connects the mounting beam and the bushing through the transition structure, so that the bushing can at least be spaced apart from the beam wall at the through hole, which can weaken the intensity of electrochemical corrosion between the bushing and the beam wall, thereby improving the problem that the bushing of the mounting structure on the box body is easy to fail.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical equipment. Background Art

[0002] The power battery pack is generally installed on the electrical equipment by mounting. Specifically, a mounting beam is usually provided on the battery case of the power battery pack, and the mounting beam is mounted to the load-bearing beam of the electrical equipment by a bolt structure. In order to prevent the mounting beam from being deformed due to excessive tightening force, a bolt bushing is usually provided in the mounting beam. The bolt bushing resists the tightening force applied to the mounting beam by the bolt structure. However, the bolt bushing in the mounting beam of the existing battery case is prone to failure after a period of use, which may cause the power battery pack to loosen. Utility Model Content

[0003] The main purpose of the present application is to provide a battery device and an electrical equipment, aiming to improve the problem that the bolt bushings in the mounting beam of the existing battery box are prone to failure after a period of use.

[0004] In a first aspect, the battery device proposed in the present application comprises a box body and a battery cell, wherein the battery cell is arranged in the box body, and a mounting structure is arranged on the box body, wherein the mounting structure comprises:

[0005] A mounting beam comprises two beam walls opposite to each other in a first direction, each of the beam walls is provided with a through hole, the two through holes are arranged in alignment in the first direction, and at least one of the two beam walls is set as a first beam wall; and,

[0006] A bushing is connected to the mounting beam through a transition structure, and the bushing is penetrated through the two through holes at both ends of the first direction, wherein the bushing is spaced apart from the first beam wall at least at the through holes.

[0007] The technical solution provided by the present application is that the bushing is penetrated by through holes on the two beam walls at both ends of the first direction, so that it can extend out on both sides of the mounting beam to withstand the tightening force. At the same time, the bushing and the first beam wall of the two beam walls are spaced apart at the through hole thereof, thereby blocking the electrochemical reaction that may occur at the through hole, that is, it plays a role in protecting the bushing at the through hole, reducing the degree of electrochemical corrosion of the bushing, and improving the problem that the bolt bushing in the mounting beam of the existing battery box is prone to failure after a period of use.

[0008] In some embodiments, the mounting structure includes an isolation ring, and the isolation ring is sleeved outside the bushing corresponding to the through hole of the first beam wall.

[0009] Among them, by sleeved with an isolation ring at the position corresponding to the through hole on the bushing, on the one hand, the through hole can be used to play a role in radial positioning of the bushing, thereby reducing the connection pressure of the adapter structure; on the other hand, the inner wall of the through hole of the first beam wall and the bushing can be separated in a harsh and humid environment to prevent water in the external environment from conductively connecting the inner wall of the through hole of the first beam wall and the bushing, thereby improving the electrochemical protection of the bushing.

[0010] In some embodiments, the transition structure includes a transition portion provided on the first beam wall, and the transition portion is connected to a corresponding end portion of the bushing.

[0011] Among them, since the corresponding end of the bushing passes through the through hole of the first beam wall, a transition part is set between the corresponding end of the bushing and the first beam wall for transition, which can at least accurately position the corresponding end of the bushing to ensure that a gap is maintained between the corresponding end of the bushing and the inner wall of the through hole of the first beam wall.

[0012] In some embodiments, an isolation ring is formed on the transition portion, and the isolation ring is sleeved in a through hole corresponding to the first beam wall and sleeved outside the bushing.

[0013] Among them, an isolation ring is formed on the transition part, so that the transition part has two functions of transitioning the first beam wall and the bushing, and isolating the inner wall of the through hole of the first beam wall and the bushing. The number of incoming materials of the mounting structure can be reduced, and the difficulty of assembling the mounting structure can be reduced. Moreover, through the setting of the isolation ring, the inner wall of the through hole of the first beam wall and the bushing can be separated in a harsh and humid environment to prevent water in the external environment from conductively connecting the inner wall of the through hole of the first beam wall and the bushing, which can improve the electrochemical protection of the bushing.

[0014] In some embodiments, the two beam walls have mounting side ends that face away from each other in the first direction;

[0015] The transition portion is arranged at the installation side end of the first beam wall.

[0016] Among them, in the process of installing the mounting structure on the mounting beam, compared with installing the adapter part to the inner end of the first beam wall, it is easier to set the adapter part on the installation side end of the first beam wall, which can reduce the difficulty of assembly. Not only that, in the process of installing the mounting structure to the load-bearing beam of the electrical equipment through the mounting bolt, due to the existence of the adapter part, it plays a role of isolating the screw head of the mounting bolt and the first beam wall or the load-bearing beam and the first beam wall, which can prevent electrochemical corrosion of the first beam wall.

[0017] In some embodiments, an end surface of the transition portion facing away from the first beam wall is arranged flush with a corresponding end surface of the bushing.

[0018] Among them, by setting the end face of the adapter portion facing away from the first beam wall to be flush with the corresponding end face of the bushing, after the battery device is installed to the load-bearing beam of the electrical equipment through the mounting bolts, the screw head of the mounting bolt or the load-bearing beam of the electrical equipment can simultaneously abut against the corresponding end of the bushing and the adapter portion, so that the mounting beam and the bushing jointly bear the tightening force, thereby improving the firmness of the mounting structure.

[0019] In some embodiments, the adapter has a clamping portion disposed toward the first direction;

[0020] The first beam wall is provided with a matching portion corresponding to the clamping portion, and the clamping portion is clamped to the matching portion along the first direction.

[0021] Among them, the adapter part and the first beam wall are connected by the snap-fitting mode of the snap-fitting part and the matching part, so that the adapter part can be quickly assembled on the first beam wall, and the adapter part can also be conveniently removed during the later maintenance process.

[0022] In some embodiments, the adapter portion and the bushing are integrally formed.

[0023] Among them, the adapter part and the bushing are connected by integral molding, so that the adapter part and the bushing can be made of one piece and are not easily separated, and can also be installed on the mounting beam together, which simplifies the assembly steps of the mounting structure.

[0024] In some embodiments, the bushing has a bushing connection section at the end portion in the first direction, and the transition portion is integrally formed by injection molding on a circumferential side of the bushing connection section.

[0025] Among them, the bushing and the transition part are processed by injection molding, which has high production efficiency and can make the transition part have good dimensional accuracy and surface quality, which is beneficial to ensure the spacing accuracy between the bushing and the through hole after the transition part is installed to the first beam wall.

[0026] In some embodiments, an engaging portion is formed on the peripheral side wall of the bushing connecting section and is protruded or recessed along the radial direction thereof, and the engaging portion and the transition portion are mutually engaged.

[0027] Among them, through the mutual interlocking arrangement of the adapter part and the interlocking part, it can at least limit the relative movement of the adapter part and the bushing along the first direction, or the circumferential relative rotation along the axis in the first direction, which can improve the connection strength between the adapter part and the bushing and prevent the adapter part and the bushing from loosening during the process of connecting the mounting structure to the load-bearing beam of the electrical equipment by the mounting bolts.

[0028] In some embodiments, the engaging portion includes a tooth structure distributed on the circumference of the bushing connecting section; and / or,

[0029] The engaging portion includes an annular groove disposed in the middle of the bushing connecting section.

[0030] Among them, a tooth structure is provided on the circumferential side of the bushing connecting section, and the tooth structure can be used to increase the injection molding connection area between the transition part and the bushing connecting section, thereby effectively limiting the relative rotational separation between the transition part and the bushing connecting section in the circumferential direction, and ensuring the connection strength between the transition part and the bushing; an annular groove is provided in the middle part of the bushing connecting section, and the transition part can be injection-molded and embedded therein, thereby effectively limiting the relative movement and separation between the transition part and the bushing connecting section in the axial direction, and ensuring the connection strength between the transition part and the bushing.

[0031] In some embodiments, the two beam walls are both configured as first beam walls, and two transition portions are correspondingly configured, and the two transition portions include:

[0032] A first transition portion is integrally formed with one end of the bushing; and

[0033] The second transition part has a limiting hole penetrating along the first direction. The limiting hole and the through hole are arranged in alignment with each other in the first direction, and the other end of the bushing is inserted into the limiting hole.

[0034] Among them, the adapter part is set to two corresponding to the two beam walls, which can be positioned and fixed from both ends of the bushing to ensure the spacing accuracy between the bushing and the through hole; the first adapter part and one end of the bushing are integrally formed, which is beneficial to reduce the number of incoming materials and can also save the assembly steps of the first adapter part and the bushing. The second adapter part is provided with a limiting hole for the bushing to be plugged in. On the premise of satisfying the positioning of the end of the bushing, it is beneficial to the assembly and disassembly between the second adapter part and the bushing, which is convenient for later maintenance.

[0035] In some embodiments, the mounting beam is made of carbon fiber; and / or,

[0036] The material of the transfer structure is plastic.

[0037] Among them, due to the excellent properties of carbon fiber such as high strength and low density, the mounting beam made of carbon fiber has excellent lightweight performance. At the same time, the mounting load that the mounting beam can withstand is also improved. The battery device with this mounting beam is particularly suitable for electrical equipment with high lightweight requirements in spacecraft and new energy vehicles; due to the excellent insulation properties and good mechanical properties of plastics, the transfer structure made of plastics can not only stably transfer the bushing to the mounting beam, but also insulate and isolate the two, reducing the degree of electrochemical corrosion between the bushing and the mounting beam.

[0038] In a second aspect, the present application further proposes an electrical device, which includes the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, 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 the structures shown in these drawings without paying any creative work.

[0040] Figure 1 A simplified structural diagram of an embodiment in which the electric device provided in this application is a vehicle;

[0041] Figure 2 A schematic diagram of an exploded structure of a battery device according to an embodiment of the present application;

[0042] Figure 3 A partial cross-sectional view of an embodiment of a mounting structure in a battery device provided in the present application;

[0043] Figure 4 for Figure 3 Structural schematic diagram of the middle mounting beam and the transfer structure;

[0044] Figure 5 for Figure 3 A schematic diagram of the structure of the middle bushing and the transition structure;

[0045] Figure 6 for Figure 3 Schematic diagram of the structure of the middle bushing;

[0046] Figure 7 for Figure 3 Schematic diagram of the structure of the middle mounting beam.

[0047] Description of Figure Numbers:

[0048] 10000, vehicles;

[0049] 1000, battery device; 2000, controller; 3000, motor;

[0050] 100, mounting structure; 200, box body; 210, box body; 220, box cover; 300, battery cell;

[0051] 1. Mounting beam; 11. Beam wall; 11a. Through hole; 11b. Fitting part; 11c. Mounting side end; 111. First beam wall; 2. Bushing; 2b. Cavity; 21. Bushing connecting section; 211. Fitting part; 211a. Tooth structure; 211b. Annular groove; 3. Transfer structure; 31. Transfer part; 31a. First transfer part; 31b. Second transfer part; 311b. Limiting hole; 311. Isolation ring; 312. Clamping part; X. First direction.

[0052] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0054] 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.

[0055] 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. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0056] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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.

[0057] 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 pieces" refers to more than two pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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.

[0059] 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 those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] For the convenience of description, the following embodiments are described by taking a vehicle 10000 as an example of an electrical device in an embodiment of the present application.

[0061] Please refer to Figure 1 , Figure 1 The electrical equipment provided for this application is a simplified structural diagram of an embodiment of a vehicle. The vehicle 10000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 1000 is provided inside the vehicle 10000, and the battery device 1000 can be arranged at the bottom, head or tail of the vehicle 10000. The battery device 1000 can be used to power the vehicle 10000, for example, the battery device 1000 can be used as an operating power supply for the vehicle 10000. The vehicle 10000 may also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery device 1000 to power the motor 3000, for example, for the working power demand of the vehicle 10000 during startup, navigation and driving.

[0062] In some embodiments of the present application, the battery device 1000 can not only serve as an operating power source for the vehicle 10000, but also serve as a driving power source for the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0063] The power battery pack is generally installed on the electrical equipment by mounting. Specifically, a mounting beam is usually provided on the battery case of the power battery pack. In order to achieve lightweight, the mounting beam is usually set as a hollow beam. The mounting beam is generally mounted to the load-bearing beam of the electrical equipment through a bolt structure. Due to the hollow design of the mounting beam, when subjected to the tightening force from the bolt structure, the two relative beam walls of the mounting beam in the mounting direction are prone to deformation. In the prior art, to deal with this situation, a bolt bushing is usually provided in the mounting beam. The bolt bushing passes through the through holes on the two relative beam walls to contact the external bolt structure and the load-bearing beam of the electrical equipment. The bolt bushing resists the tightening force applied to the mounting beam by the bolt structure, which can effectively prevent the beam wall of the mounting beam from being deformed. However, the bolt bushing in the mounting beam of the existing battery case is prone to failure after a period of use. For example, the strength of the bolt bushing will be significantly reduced and the brittleness will be significantly increased after a period of use, resulting in a loss of its supporting capacity, which may further cause the power battery pack to loosen.

[0064] From the analysis of the above problems, it can be seen that there is usually direct contact between the bolt bushing and the beam wall of the mounting beam, and the materials of the two are usually different. For example, the mounting beam is usually made of aluminum alloy in pursuit of lightness, while the bolt bushing is usually made of carbon steel in pursuit of higher mechanical properties. Therefore, there is usually an electrochemical reaction between the bolt bushing and the beam wall of the mounting beam (the intensity of the electrochemical reaction is greater in a humid environment), which leads to electrochemical corrosion between the bolt bushing and the beam wall of the mounting beam, which in turn leads to the problem that the bolt bushing is prone to failure after a period of use.

[0065] Further analysis shows that the main factors that cause electrochemical corrosion between two materials include: 1. The existence of a standard electrode potential difference; 2. The existence of an electrolyte; 3. The supply of oxygen; 4. The existence of an electrical connection path between the two materials. Obviously, it is difficult for the mounting structure of the battery device to be isolated from the external air environment, so it is difficult to solve the problem of electrochemical corrosion from the perspective of "oxygen supply". At the same time, since electrical equipment usually needs to pass through a wading environment or a humid environment on rainy days, and the moisture in the external environment acts as an electrolyte, it is obviously difficult to solve the problem of electrochemical corrosion from the perspective of "the existence of an electrolyte". Therefore, a more practical solution is to separate the two materials by means of a transfer, thereby blocking the electrical connection path between the two.

[0066] Based on this, the present application provides a battery device with a mounting structure, which can at least improve the problem that the bolt bushings in the mounting beam of the existing battery box are prone to failure after a period of use.

[0067] To facilitate understanding of the battery device provided by the present application, the following is a description with reference to the accompanying drawings, wherein: Figure 2 A schematic diagram of an exploded structure of a battery device according to an embodiment of the present application; Figure 3 A partial cross-sectional view of an embodiment of a mounting structure in a battery device provided in the present application; Figure 4 for Figure 3 Structural schematic diagram of the middle mounting beam and the transfer structure; Figure 5 for Figure 3 A schematic diagram of the structure of the middle bushing and the transition structure; Figure 6 for Figure 3 Schematic diagram of the structure of the middle bushing; Figure 7 for Figure 3 Schematic diagram of the structure of the middle mounting beam.

[0068] See also Figure 2 , Figure 3 and Figure 7 In one embodiment of the present application, the battery device 1000 includes a box body 200 and a battery cell 300. The battery cell 300 is arranged in the box body 200. A mounting structure is arranged on the box body 200. The mounting structure includes a mounting beam 1 and a bushing 2. The mounting beam 1 includes two beam walls 11 opposite to each other in a first direction X. Each beam wall 11 is provided with a through hole 11a. The two through holes 11a are arranged in alignment in the first direction X. At least one of the two beam walls 11 is set as a first beam wall 111; the bushing 2 is connected to the mounting beam 1 through a transition structure 3. The bushing 2 is penetrated by the two through holes 11a at both ends of the first direction X, wherein the bushing 2 is spaced apart from the first beam wall 111 at least at the through hole 11a.

[0069] It should be noted that the first direction X mentioned in the embodiment of the present application generally refers to the direction in which the battery device 1000 is mounted on the electrical equipment, and usually also refers to the height direction of the battery device 1000, but it does not exclude that some battery devices 1000 are mounted on the electrical equipment through their extension direction (horizontal direction). In the embodiment of the application, the first direction X is the same as the axial direction of the bushing 2, so the radial direction of the bushing 2 mentioned in the following embodiment refers to any direction in the plane perpendicular to the first direction X.

[0070] Generally speaking, the battery device 1000 also needs to load multiple battery cells 300 through the box body 200. Figure 2As shown, the box body 200 is a main loading component of the battery device 1000. The battery device 1000 is mainly installed on the vehicle through the box body 200, and the battery cell 300 is installed through the installation cavity inside the box body 200. The basic structure of the box body 200 generally includes a box body 210 and a box cover 220. The box cover 220 is arranged on the box body 210 and defines the box body 200 together with the box body 210. Generally speaking, the battery cell 300 is generally arranged on the box body 210. After the battery device 1000 is mounted on the vehicle, the box cover 220 The box body 210 is generally close to the vehicle, and the box body 210 is generally away from the vehicle; the installation cavity can be mainly formed in the box body 210. In this case, the box body 210 can be understood as a basin-shaped structure, and the box cover 220 is covered on the box body 210 to cover the installation cavity; the installation cavity can also be mainly formed in the box cover 220. In this case, the box cover 220 can be understood as a cover-shaped structure. The box cover 220 is covered on the box body 210 to cover the battery cell 300 carried on the box body 210 into the box cover 220. Of course, the structure of the box body 200 is not limited to this, and this embodiment does not limit it.

[0071] The number of battery cells 300 in the box 200 can be one or more, wherein the multiple battery cells 300 can be connected in series, in parallel or in mixed connection. Mixed connection means that the multiple battery cells 300 are both connected in series and in parallel. The multiple battery cells 300 can be directly connected in series, in parallel or in mixed connection to form a battery as a whole. Of course, the multiple battery cells 300 can also be in the form of battery cells 300 first connected in series, in parallel or in mixed connection to form a battery module (for example, multiple battery cells 300 stacked in a row), and then multiple battery modules are connected in series, in parallel or in mixed connection to form a battery as a whole (for example, multiple rows of multiple columns of battery cells 300 arranged in multiple rows). The battery device 1000 may also include other structures. For example, the battery device 1000 may also include a confluence component for realizing electrical connection between multiple battery cells 300 or multiple battery modules. Among them, each battery cell 300 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 300 may be cylindrical, flat, rectangular or in other shapes.

[0072] The "mounting structure" is a connection structure between the box body 200 and the electrical equipment, which includes a mounting beam 1 and a bushing 2. The mounting beam 1 can be located on the box body 200 at the edge to form an edge mounting form, or in the middle to form a middle mounting form. This embodiment does not limit this, but in order to meet the lightweight design requirements, the mounting beam 1 is set as a hollow structure, so as to have two beam walls 11 opposite to each other in the first direction X, and the through holes 11a on the two beam walls 11 are all through in the first direction X, and are arranged in alignment along the first direction X, that is, coaxially arranged; the bushing 2 can generally be understood as a sleeve having a cavity 2b passing through. In the battery device 1000 provided in the embodiment of the present application, the main function of the bushing 2 is to allow the mounting bolts to pass through, so that the mounting bolts can be connected to the load-bearing beam of the electrical equipment through the mounting nuts. Therefore, the two ends of the bushing 2 are usually in contact with the screw heads of the mounting bolts and the load-bearing beam of the electrical equipment. Of course, it is not limited to this. It should be noted that there may be other wall bodies between the two beam walls 11 to increase the structural strength of the mounting beam 1. At this time, the wall body also needs to be provided with a channel for the middle part of the bushing 2 to pass through. The embodiment of the present application does not limit this.

[0073] “The bushing 2 is connected to the mounting beam 1 through the transition structure 3” can be understood as the bushing 2 is connected to at least one beam wall 11 of the mounting beam 1 through the transition structure 3, and can also be connected to other walls of the mounting beam 1 except the beam wall 11, such as the side wall. No matter where the bushing 2 is connected to the mounting beam 1 through the transition structure 3, the rigid fixation of the bushing 2 relative to the mounting beam 1 should be ensured. At the same time, the transition structure 3 transitions the bushing 2 and the mounting beam 1. The indirect conductive efficiency of the transition structure 3 between the bushing 2 and the mounting beam 1 should be less than the direct conductive efficiency between the bushing 2 and the mounting beam 1. Therefore, the material of the transition structure 3 can be an insulating material, such as a plastic material, or a specially treated metal material, such as a metal material with surface passivation.

[0074] In the existing scheme, the bolt bushing needs to be limited by the through holes on the two opposite beam walls of the mounting beam, so the bolt bushing needs to contact the inner wall of the through hole. In the present scheme, since the bushing 2 and the mounting beam 1 are already connected by the transition structure 3, the bushing 2 has been limited. Therefore, there is no need for direct contact between the bushing 2 and the mounting beam 1. Based on this, "the bushing 2 is at least spaced apart from the first beam wall 111 at the through hole 11a" means that the bushing 2 is spaced apart from the inner wall of the through hole 11a on the first beam wall 111. This scheme includes "the bushing 2 is only spaced apart from the first beam wall 111 at the through hole 11a" and "the bushing 2 is spaced apart from the first beam wall 111 as a whole". Regardless of which scheme is adopted, the bushing 2 is at least spaced apart from the first beam wall 111 at the through hole 11a, so that at least the contact area between the bushing 2 and the first beam wall 111 can be reduced, thereby reducing the intensity of electrochemical corrosion encountered by the bushing 2, thereby at least improving the problem of failure of the bushing 2 to a certain extent. And “at least one of the two beam walls 11 is set as the first beam wall 111” includes: “one of the two beam walls 11 is set as the first beam wall 111” and “both beam walls 11 are set as the first beam wall 111”. Regardless of which scheme is adopted, the bushing 2 is spaced apart from the through hole 11a on at least one of the two beam walls 11, so that at least the area of ​​direct contact between the bushing 2 and the mounting beam 1 can be reduced, thereby reducing the intensity of electrochemical corrosion of the bushing 2.

[0075] The technical solution provided by the present application is that the bushing 2 is located at both ends of the first direction X and penetrates through holes 11a on the two beam walls 11, so that it can extend out on both sides of the mounting beam 1 to withstand the tightening force. At the same time, the bushing 2 and the first beam wall 111 of the two beam walls 11 are spaced apart at the through hole 11a thereof, thereby blocking the electrochemical reaction that may occur at the through hole 11a, that is, it plays a role in protecting the bushing 2 at the through hole 11a, reducing the degree of electrochemical corrosion of the bushing 2, and improving the problem that the bolt bushing in the mounting beam of the existing battery box is prone to failure after a period of use.

[0076] See also Figure 4 and Figure 5 In some embodiments, the mounting structure includes an isolation ring 311 , and the isolation ring 311 is sleeved outside the bushing 2 corresponding to the through hole 11 a of the first beam wall 111 .

[0077] It should be noted that “the isolation ring 311 is sleeved on the outside of the bushing 2 corresponding to the through hole 11a of the first beam wall 111” means that the isolation ring 311 is located between the inner wall of the through hole 11a of the first beam wall 111 and the bushing 2. Generally speaking, the isolation ring 311 is in direct contact with the outer wall of the bushing 2 and the inner wall of the through hole 11a of the first beam wall 111. The isolation ring sleeve can exist independently or be part of the transition structure 3, which is not limited in this embodiment. It is worth mentioning that since the first beam wall 111 may be set to two, the isolation ring 311 may also be set to two for the through holes 11a of the two first beam walls 111.

[0078] According to the above technical solution, by sleeved with an isolation ring 311 at the position corresponding to the through hole 11a on the bushing 2, on the one hand, the through hole 11a can be used to radially position the bushing 2 to reduce the connection pressure of the adapter structure 3; on the other hand, the inner wall of the through hole 11a of the first beam wall 111 and the bushing 2 can be separated in a harsh and humid environment to prevent water in the external environment from conductively connecting the inner wall of the through hole 11a of the first beam wall 111 and the bushing 2, which can improve the electrochemical protection of the bushing 2 (for example, in a wading environment, moisture may invade the gap between the bushing 2 and the inner wall of the through hole 11a of the first beam wall 111 and adhere to the two).

[0079] See also Figure 3 and Figure 4 In some embodiments, the transition structure 3 includes a transition portion 31 disposed on the first beam wall 111 , and the transition portion 31 is connected to a corresponding end of the bushing 2 .

[0080] It should be noted that “the transition structure 3 includes a transition portion 31 arranged on the first beam wall 111” means that the transition portion 31 and the first beam wall 111 are in a one-to-one correspondence. When the first beam wall 111 is set as a single one, the transition portion 31 is correspondingly set as one. When the first beam wall 111 is set as two, the transition portion 31 is also correspondingly set as two. The two transition portions 31 can be connected as one or in separate bodies. This embodiment only limits the connection position of the transition portion 31 on the bushing 2, and does not limit the specific structure of the transition portion 31 and the specific connection method between the transition portion 31 and the first beam wall 111.

[0081] According to the above technical solution, since the corresponding end of the bushing 2 is arranged to pass through the through hole 11a of the first beam wall 111, a transition portion 31 is set between the corresponding end of the bushing 2 and the first beam wall 111 for transition, at least the corresponding end of the bushing 2 can be positioned more accurately to ensure that a gap is maintained between the corresponding end of the bushing 2 and the inner wall of the through hole 11a of the first beam wall 111.

[0082] See also Figure 4 and Figure 5In some embodiments, an isolation ring 311 is formed on the transition portion 31 , and the isolation ring 311 is sleeved in the through hole 11 a corresponding to the first beam wall 111 and sleeved outside the bushing 2 .

[0083] It should be noted that the above embodiment has explained the isolation ring 311, which will not be elaborated in this embodiment; “an isolation ring 311 is formed on the adapter 31” means that the adapter 31 and the isolation ring 311 are arranged in one piece.

[0084] According to the above technical solution, an isolation ring 311 is formed on the transition part 31, so that the transition part 31 has two functions of transitioning the first beam wall 111 and the bushing 2, and isolating the inner wall of the through hole 11a of the first beam wall 111 and the bushing 2. The number of incoming materials of the mounting structure can be reduced, and the difficulty of assembling the mounting structure can be reduced. Moreover, through the setting of the isolation ring 311, the inner wall of the through hole 11a of the first beam wall 111 and the bushing 2 can be separated in a harsh and humid environment to prevent water in the external environment from conductively connecting the inner wall of the through hole 11a of the first beam wall 111 and the bushing 2, which can improve the electrochemical protection of the bushing 2.

[0085] See also Figure 4 and Figure 7 In some embodiments, the two beam walls 11 have mounting side ends 11 c that are away from each other in the first direction X; the transition portion 31 is disposed at the mounting side end 11 c of the first beam wall 111 .

[0086] Generally speaking, two beam walls 11 opposite to each other along the first direction X usually have inner ends facing each other. Based on this, "the two beam walls 11 have installation side ends 11c that are set away from each other" can be understood as the side end of the beam wall 11 that is away from its own inner end in the first direction X is the installation side end 11c, and the installation side end 11c is usually also the outer end of the mounting beam 1.

[0087] According to the above technical solution, in the process of installing the mounting structure on the mounting beam 1, it is easier to set the adapter part 31 on the installation side end 11c of the first beam wall 111 than to install the adapter part 31 on the inner end of the first beam wall 111, which can reduce the difficulty of assembly. Moreover, in the process of installing the mounting structure to the load-bearing beam of the electrical equipment through the mounting bolts, due to the existence of the adapter part 31, it plays a role of isolating the screw head of the mounting bolt from the first beam wall 111 or the load-bearing beam from the first beam wall 111, which can prevent the first beam wall 111 from electrochemical corrosion.

[0088] Please continue reading Figure 4 and Figure 7 In some embodiments, the end surface of the transition portion 31 facing away from the first beam wall 111 is flush with the corresponding end surface of the bushing 2 .

[0089] It should be noted that, since the adapter portion 31 is arranged at the installation side end 11c of the first beam wall 111, the end face of the adapter portion 31 facing away from the first beam wall 111 is usually arranged toward the screw head of the mounting bolt or the load-bearing beam of the electrical equipment; "the end face of the adapter portion 31 facing away from the first beam wall 111 is arranged flush with the corresponding end face of the bushing 2" can be understood as that the end face of the adapter portion 31 facing away from the first beam wall 111 and the corresponding end face of the bushing 2 are in the same plane in the first direction X.

[0090] According to the above technical solution, by setting the end face of the adapter 31 facing away from the first beam wall 111 to be flush with the corresponding end face of the bushing 2, after the battery device 1000 is installed on the load-bearing beam of the electrical equipment through the mounting bolts, the screw head of the mounting bolt or the load-bearing beam of the electrical equipment can simultaneously abut against the corresponding end of the bushing 2 and the adapter 31, so that the mounting beam 1 and the bushing 2 jointly bear the tightening force, thereby improving the firmness of the mounting structure.

[0091] See also Figure 3 and Figure 4 In some embodiments, the adapter portion 31 has a clamping portion 312 disposed toward the first direction X; the first beam wall 111 is provided with a matching portion 11b corresponding to the clamping portion 312, and the clamping portion 312 is clamped to the matching portion 11b along the first direction X.

[0092] It should be noted that, since the clamping portion 312 faces the first direction X and can be clamped to the matching portion 11b provided on the first beam wall 111 along the first direction X, it can be understood that the clamping portion 312 is located on the side of the adapter portion 31 facing the first beam wall 111. The clamping portion 312 is matched with the matching portion 11b by clamping, and there are many specific structural forms, such as a two-way buckle, a rotating buckle, etc. Figures 3 to 5 In the embodiment, the adapter 31 is connected to the first beam wall 111 by a two-way snap fastener. At this time, the matching portion 11b is set as a snap hole, and the snap-fitting portion 312 is set as a double-claw cantilever that can be forced to approach each other. During the snap-fitting process, the double-claw cantilever on the adapter 31 is first squeezed by the snap hole on the first beam wall 111 to approach each other. After passing through the snap hole from the other side, the double-claw cantilever can be elastically reset, thereby snap-fitting the limit adapter 31 and the first beam wall 111 in the first direction X. This embodiment does not limit the specific structural form of the snap-fitting portion 312 and the matching portion 11b.

[0093] According to the above technical solution, the adapter part 31 and the first beam wall 111 are connected by snapping the clamping part 312 with the matching part 11b, so that the adapter part 31 can be quickly assembled on the first beam wall 111, and the adapter part 31 can also be conveniently removed during later maintenance.

[0094] See also Figure 5In some embodiments, the adapter portion 31 and the bushing 2 are integrally formed.

[0095] It should be noted that there are many ways of "integrated molding", such as casting, powder metallurgy, additive manufacturing, forging, extrusion molding, welding integration, etc. This embodiment does not limit the specific method of integrated molding.

[0096] According to the above technical solution, the adapter part 31 and the bushing 2 are connected by integral molding, so that the adapter part 31 and the bushing 2 can be made of one piece and are not easily separated, and can also be installed on the mounting beam 1 together, simplifying the assembly steps of the mounting structure.

[0097] Please continue reading Figure 5 In some embodiments, the bushing 2 has a bushing connection section 21 at the end portion in the first direction X, and the transition portion 31 is integrally formed by injection molding on the circumference of the bushing connection section 21 .

[0098] It should be noted that "injection molding" utilizes thermoplastic materials such as plastic or rubber, injects them into the mold cavity at high temperature, and forms the desired shape after cooling and solidification. In this embodiment, "the transition part 31 is injection molded on the surrounding side of the bushing connecting section 21" means that the material of the transition part 31 is plastic or rubber, and the "bushing connecting section 21" refers to the end of the bushing 2 that passes through the through hole 11a along the first direction X.

[0099] According to the above technical scheme, the bushing 2 and the transition part 31 are processed by one-piece injection molding, which has high production efficiency and can enable the transition part 31 to have good dimensional accuracy and surface quality, which is beneficial to ensure the spacing accuracy between the bushing 2 and the through hole 11a after the transition part 31 is installed to the first beam wall 111; and compared with the method of bonding the transition part 31 and the bushing 2 by structural adhesive, the one-piece injection molding method can better ensure the relative position accuracy of the transition part 31 and the bushing 2.

[0100] See also Figure 5 and Figure 6 In some embodiments, a fitting portion 211 is formed on the peripheral side wall of the bushing connecting section 21 and is protruded or recessed along the radial direction thereof, and the fitting portion 211 and the transition portion 31 are fitted with each other.

[0101] It should be noted that the adapter portion 31 is injection molded integrally with the bushing connecting section 21, which can be understood as the adapter portion 31 being able to cover various positions on the circumferential side of the bushing connecting section 21, and the "fitting portion 211" refers to a structure that can be interlocked and connected with the adapter portion 31 in the radial direction of the bushing connecting section 21. For example, when the fitting portion 211 is a protrusion arranged on the circumferential side wall of the bushing connecting section 21, a groove is formed at the corresponding position on the adapter portion 31, and the groove and the protrusion are fit-fitted and connected to each other.

[0102] According to the above technical solution, through the mutual interlocking setting of the adapter part 31 and the interlocking part 211, it can at least limit the relative movement of the adapter part 31 and the bushing 2 along the first direction X, or the circumferential relative rotation along the axis of the first direction X, which can improve the connection strength between the adapter part 31 and the bushing 2 and prevent the adapter part 31 and the bushing 2 from loosening during the process of connecting the mounting structure to the load-bearing beam of the electrical equipment by the mounting bolts.

[0103] Please continue reading Figure 6 In some embodiments, the engaging portion 211 includes a tooth structure 211 a distributed on the circumference of the bushing connecting section 21 .

[0104] It should be noted that the "tooth structure 211a" is also called a spline structure, which is an efficient mechanical connection method. In the present embodiment, the tooth structure 211a is applied to the injection molding connection between the adapter 31 and the bushing connecting section 21. The tooth structure 211a is distributed on the circumferential side of the bushing connecting section 21. It can be understood that the tooth structure 211a is an external tooth structure 211a.

[0105] According to the above technical solution, a tooth structure 211a is provided on the circumferential side of the bushing connecting section 21, and the tooth structure 211a can be utilized to increase the injection molding connection area between the transition part 31 and the bushing connecting section 21, thereby effectively limiting the relative rotational separation between the transition part 31 and the bushing connecting section 21 in the circumferential direction, thereby ensuring the connection strength between the transition part 31 and the bushing 2.

[0106] Please continue reading Figure 6 In other embodiments, the engaging portion 211 includes an annular groove 211 b disposed in the middle of the bushing connecting section 21 .

[0107] It should be noted that “the middle part of the bushing connecting section 21 ” refers to the middle part of the bushing connecting section 21 along the first direction X. The annular groove 211 b is arranged there, and its annular extension direction also refers to the circumferential direction of the bushing connecting section 21 .

[0108] According to the above technical solution, an annular groove 211b is provided in the middle part of the bushing connecting section 21, into which the transition part 31 can be injection-molded and embedded, thereby effectively limiting the relative movement and separation between the transition part 31 and the bushing connecting section 21 in the axial direction, thereby ensuring the connection strength between the transition part 31 and the bushing 2.

[0109] It should be noted that the above two parallel technical solutions "the interlocking portion 211 includes a tooth structure 211a distributed on the circumferential side of the bushing connecting section 21" and "the interlocking portion 211 includes an annular groove 211b arranged in the middle part of the bushing connecting section 21" can be set selectively or simultaneously. Obviously, when they are set simultaneously, the connection between the bushing 2 and the adapter portion 31 is more firmly connected.

[0110] See also Figure 3 and Figure 4 In some embodiments, the two beam walls 11 are both configured as the first beam wall 111, and two transition parts 31 are correspondingly configured. The two transition parts 31 include a first transition part 31a and a second transition part 31b. The first transition part 31a is integrally formed with one end of the bushing 2; the second transition part 31b has a limiting hole 311b that passes through along the first direction X, the limiting hole 311b is aligned with the through hole 11a in the first direction X, and the other end of the bushing 2 is inserted into the limiting hole 311b.

[0111] It should be noted that the other end of the bushing 2 is inserted into the limiting hole 311b, and the second adapter portion 31b can use the limiting hole 311b to detachably position the other end of the bushing 2.

[0112] According to the above technical solution, two adapter parts 31 are set corresponding to the two beam walls 11, so that the bushing 2 can be positioned and fixed from both ends to ensure the spacing accuracy between the bushing 2 and the through hole 11a; the first adapter part 31a is integrally formed with one end of the bushing 2, which is beneficial to reducing the number of incoming materials and can also omit the assembly steps of the first adapter part 31a and the bushing 2. The second adapter part 31b is provided with a limiting hole 311b for the bushing 2 to be plugged in. On the premise of satisfying the positioning of the end of the bushing 2, it is beneficial to the assembly and disassembly between the second adapter part 31b and the bushing 2, and it is convenient for later maintenance.

[0113] In some embodiments, the mounting beam 1 is made of carbon fiber.

[0114] It should be noted that carbon fiber is a fiber material composed of carbon atoms, which has the advantages of high strength, high modulus, low density, high temperature resistance, chemical corrosion resistance and good fatigue resistance. It is usually used to manufacture composite materials, and is combined with matrix materials such as resin, metal or ceramic to form structural parts or components with excellent mechanical and physical properties.

[0115] According to the above technical solution, since carbon fiber has excellent properties such as high strength and low density, the mounting beam 1 made of carbon fiber has excellent lightweight performance, and the mounting load that the mounting beam 1 can withstand is also improved. The battery device 1000 with the mounting beam 1 is particularly suitable for electrical equipment with high lightweight requirements in spacecraft (such as electric drones) and new energy vehicles.

[0116] In some embodiments, the material of the transfer structure 3 is plastic.

[0117] It should be noted that plastics generally include thermoplastics and thermosetting plastics, which generally have the characteristics of low density, good corrosion resistance, good mechanical properties, good insulation and low cost.

[0118] According to the above technical solution, since plastic has excellent insulation properties and good mechanical properties, the transition structure made of plastic can not only stably transfer the bushing to the mounting beam, but also insulate and isolate the two, thereby reducing the degree of electrochemical corrosion between the bushing and the mounting beam.

[0119] The above two parallel technical solutions "the material of the mounting beam 1 is carbon fiber" and "the material of the transfer structure 3 is plastic" can be set either one or both. Obviously, setting them both together will have a better effect.

[0120] The present application also proposes an electric device, which includes a battery device 1000, and the battery device 1000 is used to provide electric energy. The specific structure of the battery device 1000 refers to the above embodiment. Since the electric device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the battery device 1000 is used to provide electric energy to the electric device, and the electric device includes but is not limited to new energy vehicles such as pure electric vehicles, hybrid vehicles and extended-range vehicles, as well as engineering vehicles such as electric excavators and electric bulldozers, and can also include aircraft such as electric drones and electric passenger aircraft.

[0121] The present application proposes a battery device 1000, which includes a box body 200 and a battery cell 300. The battery cell 300 is arranged in the box body 200. A mounting structure is arranged on the box body 200. The mounting structure includes a mounting beam 1, a transfer structure 3 and a bushing 2. The mounting beam 1 is made of carbon fiber. The mounting beam 1 includes two beam walls 11 opposite to each other in a first direction X. The two beam walls 11 have mounting side ends 11c arranged away from each other. Each beam wall 11 is provided with a through hole 11a, and the two through holes 11a are arranged in alignment in the first direction X; the bushing 2 is penetrated by the two through holes 11a at both ends of the first direction X, and the bushing 2 has a bushing connection section 21 at one end of the first direction X. The peripheral side of the bushing connection section 21 is distributed with a flower tooth structure 211a, and the middle part of the bushing connection section 21 is also provided with an annular groove 211b; the transfer structure 3 includes two transfer parts 31, the two The adapter parts 31 are respectively arranged at the installation side ends 11c of the two beam walls 11 corresponding to the two ends of the bushing 2. The end surface of the adapter part 31 facing away from the beam wall 11 is flush with the corresponding end surface of the bushing 2. The adapter part 31 has a clamping part 312 arranged toward the first direction X. The beam wall 11 is provided with a matching part 11b corresponding to the clamping part 312. The clamping part 312 is clamped and arranged on the matching part 11b along the first direction X. The two adapter parts 31 include a first adapter part 31a and a second adapter part 31b. The first adapter part 31a is injection-molded integrally on the bushing connecting section 21 of the bushing 2, and is mutually embedded with the tooth structure 211a and the annular groove 211b. The second adapter part 31b has a limiting hole 311b that passes through along the first direction X. The limiting hole 311b and the through hole 11a are arranged in alignment with each other in the first direction X. The other end of the bushing 2 opposite to the bushing connecting section 21 is inserted into the limiting hole 311b.

[0122] 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, characterized in that: The invention comprises a box body and a battery cell, wherein the battery cell is arranged in the box body, and a mounting structure is arranged on the box body, wherein the mounting structure comprises: A mounting beam comprises two beam walls opposite to each other in a first direction, each of the beam walls is provided with a through hole, the two through holes are arranged in alignment in the first direction, and at least one of the two beam walls is set as a first beam wall; and, A bushing is connected to the mounting beam through a transition structure, and the bushing is penetrated through the two through holes at both ends of the first direction, wherein the bushing is spaced apart from the first beam wall at least at the through holes.

2. The battery device according to claim 1, characterized in that: The mounting structure comprises an isolation ring, and the isolation ring is sleeved outside the bushing corresponding to the through hole of the first beam wall.

3. The battery device according to claim 1, characterized in that: The transition structure includes a transition portion disposed on the first beam wall, and the transition portion is connected to a corresponding end portion of the bushing.

4. The battery device according to claim 3, characterized in that: An isolation ring is formed on the transition portion. The isolation ring is sleeved in a through hole corresponding to the first beam wall and sleeved outside the bushing.

5. The battery device according to claim 3, characterized in that: The two beam walls have installation side ends which are away from each other in the first direction; The transition portion is arranged at the installation side end of the first beam wall.

6. The battery device according to claim 5, characterized in that An end surface of the transition portion facing away from the first beam wall is arranged flush with a corresponding end surface of the bushing.

7. The battery device according to claim 3, characterized in that: The adapter portion has a clamping portion arranged toward the first direction; The first beam wall is provided with a matching portion corresponding to the clamping portion, and the clamping portion is clamped to the matching portion along the first direction.

8. The battery device according to any one of claims 3 to 7, characterized in that: The adapter portion and the bushing are integrally formed.

9. The battery device according to claim 8, characterized in that: The bushing has a bushing connection section at the end portion in the first direction, and the transition portion is integrally formed by injection molding on the circumference of the bushing connection section.

10. The battery device according to claim 9, characterized in that An engaging portion is formed on the peripheral side wall of the bushing connection section and is protruded or recessed along its radial direction. The engaging portion and the transition portion are mutually engaged.

11. The battery device according to claim 10, characterized in that: The engaging portion includes a tooth structure distributed on the circumference of the bushing connection section; and / or, The engaging portion includes an annular groove disposed in the middle of the bushing connecting section.

12. The battery device according to any one of claims 3 to 7, characterized in that: The two beam walls are both configured as first beam walls, and two transition parts are correspondingly configured, and the two transition parts include: A first transition portion is integrally formed with one end of the bushing; and The second transition part has a limiting hole penetrating along the first direction. The limiting hole and the through hole are arranged in alignment with each other in the first direction, and the other end of the bushing is inserted into the limiting hole.

13. The battery device according to any one of claims 1 to 7, characterized in that: The material of the mounting beam is carbon fiber; and / or, The material of the transfer structure is plastic.

14. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 13.

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