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 positional manner in the first direction, the bushing is penetrated through the two through holes at both ends of the first direction, the bushing has a contact portion in contact with the beam wall, the contact portion forms a corrosion-resistant surface layer in contact with the beam wall, and / or the standard electrode potential of the material of the contact portion is equivalent to the standard electrode potential of the material of the beam wall. The technical solution provided by the present application can weaken the intensity of electrochemical corrosion between the bushing and the beam wall by improving the material of the contact portion on the bushing, or forming a corrosion-resistant surface layer on the contact portion, 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 includes 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 includes:

[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, and the two through holes are arranged in alignment in the first direction; and

[0006] A bushing, the bushing being disposed at both ends of the first direction and passing through the two through holes, the bushing having a contact portion contacting the beam wall;

[0007] The contact portion is formed with a corrosion-resistant surface layer in contact with the beam wall, and / or the standard electrode potential of the material of the contact portion is equivalent to the standard electrode potential of the material of the beam wall.

[0008] The technical solution provided by the present application is that the bushing is through holes on the two beam walls at both ends of the first direction, so that it can extend out of both sides of the mounting beam to withstand the tightening force. At the same time, the bushing also has a contact portion. After the installation is completed, the bushing is in direct contact with the beam wall through its contact portion. On the one hand, the contact portion is formed with a corrosion-resistant surface layer, which can block the electrochemical reaction between the contact portion and the beam wall to a certain extent. On the other hand, the standard electrode potential of the material of the contact portion is equivalent to the standard electrode potential of the material of the beam wall, so that the contact portion and the beam wall are not prone to electrochemical reaction. These two methods can both protect the bushing, reduce the degree of electrochemical corrosion encountered by the bushing, and improve the problem that the bolt bushing in the mounting beam of the existing battery box is prone to failure after a period of use.

[0009] In some embodiments, the bushing comprises a metal bushing formed with a passivation surface layer, the passivation surface layer comprising a corrosion-resistant surface layer of the contact portion.

[0010] Among them, the bushing is set as a metal bushing with a passivated surface layer. When the metal bushing contacts the beam wall, the passivated surface layer can significantly reduce the electrochemical activity of the metal bushing, thereby effectively preventing further electrochemical corrosion from occurring.

[0011] In some embodiments, the metal bushing is made of titanium alloy.

[0012] When titanium alloy is exposed to air or oxygen-containing environment, it will react quickly with oxygen and form a very thin and strong titanium dioxide oxide film on its surface. This titanium dioxide oxide film is the passivation surface layer. The passivation surface layer of the metal bushing made of titanium alloy can also demonstrate rapid self-repair capabilities when it is damaged by mechanical damage or other reasons, ensuring that the metal bushing continues to maintain its electrochemical corrosion resistance.

[0013] In some embodiments, the peripheral side wall of the bushing is recessed inwardly, and a clamping protrusion is formed on the inner side wall of the bushing;

[0014] The mounting structure also includes a mounting bolt, a matching groove is formed on the peripheral side wall of the mounting bolt, the mounting bolt is passed through the bushing, and the clamping protrusion is clamped to the matching groove.

[0015] Among them, a clamping protrusion is formed on the inner wall of the bushing, and a matching groove is formed on the peripheral side wall of the mounting bolt. The mounting bolt can be pre-inserted into the bushing, and the clamping protrusion is clamped into the matching groove by interference extrusion. This allows the mounting bolt and the bushing to be made as one piece and not easy to fall off. They can also be installed on the mounting beam together, simplifying the assembly steps of the mounting structure.

[0016] In some embodiments, the mating groove is arranged in an annular shape.

[0017] Among them, the matching grooves are all set as annular grooves. When the mounting bolt is inserted into the bushing, there is no need to align the clamping protrusion and the matching groove along the circumference of the bushing. The clamping protrusion and the matching groove can be ensured to be clamped by directly inserting them along the axial direction of the bushing, which simplifies the difficulty of connecting the mounting bolt and the bushing.

[0018] In some embodiments, the two beam walls have mounting side ends that are disposed away from each other;

[0019] The bushing comprises a bushing body, and a first end and a second end located at both sides of the bushing body along the first direction, at least one of the first end and the second end is extended along its radial direction to form a lap portion, and the lap portion is lapped to the corresponding installation side end;

[0020] Wherein, the contact portion includes the overlapping portion.

[0021] Among them, at least one of the first end and the second end of the bushing is set as a lap joint extending along its radial direction. Since the lap joint overlaps the installation side end of the corresponding beam wall, on the one hand, the lap joint can play a role in limiting the installation of the bushing. On the other hand, after the battery device is mounted on the load-bearing beam of the electrical equipment, the lap joint can be blocked between the screw head of the mounting bolt or the load-bearing beam and the corresponding beam wall, which can play a role in protecting the beam wall.

[0022] In some embodiments, the overlapping portion includes a first overlapping edge at a first end of the bushing, and the first overlapping edge is formed by riveting.

[0023] Among them, before forming the first overlap, the extension direction of the first end of the bushing and the bushing body is both the first direction, and can easily pass through the through hole of the corresponding beam wall. After that, the first end is formed into the first overlap through the riveting process, which reduces the difficulty of installing the bushing on the beam wall.

[0024] In some embodiments, an annular weak portion is formed at a location where the peripheral side wall of the bushing body is adjacent to the first overlapped edge.

[0025] Among them, an annular weak portion is formed at the position where the circumferential side wall of the bushing body is adjacent to the first lap. During the riveting process of the first end of the bushing, the annular weak portion on the circumferential side wall of the bushing body can guide the first end to turn outward, which is conducive to the accurate forming of the first lap.

[0026] In some embodiments, the overlapping portion includes a second overlapping edge at the second end of the bushing, and the second overlapping edge is elastically arranged so that the periphery of the second overlapping edge can elastically retract inward.

[0027] Among them, since the second lap at the second end of the bushing is elastically arranged and the periphery of the second lap can elastically retract inward, when the battery device is mounted to the load-bearing beam of the electrical equipment through the mounting bolts, the second lap can absorb the mounting tolerance to a certain extent through its own elastic deformation, thereby ensuring a firm connection between the mounting bolts, the bushing and the load-bearing beam.

[0028] In some embodiments, the position where the bushing body is adjacent to the second overlap edge is recessed inwardly, so as to form a snap-fitting protrusion on the inner side wall of the bushing;

[0029] The mounting structure also includes a mounting bolt that penetrates the bushing, a matching groove is formed on the peripheral side wall of the mounting bolt, and the clamping protrusion is clamped to the matching groove.

[0030] Among them, a clamping protrusion is formed on the inner wall of the bushing, and a matching groove is formed on the peripheral side wall of the mounting bolt. The mounting bolt can be pre-inserted into the bushing, and the clamping protrusion is clamped into the matching groove by interference extrusion. This allows the mounting bolt and the bushing to be made as one piece and not easy to fall off. They can also be installed on the mounting beam together, simplifying the assembly steps of the mounting structure.

[0031] In some embodiments, the mounting beam is made of carbon fiber.

[0032] 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.

[0033] In a second aspect, the present application further proposes an electrical device, which includes the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 A simplified structural diagram of an embodiment in which the electric device provided in this application is a vehicle;

[0036] Figure 2 A schematic diagram of an exploded structure of a battery device according to an embodiment of the present application;

[0037] Figure 3 A partial cross-sectional view of an embodiment of a mounting structure in a battery device provided in the present application;

[0038] Figure 4 for Figure 3 Structural diagram of the middle mounting beam;

[0039] Figure 5 for Figure 3 Schematic diagram of the structure of the middle bushing;

[0040] Figure 6 for Figure 3 Schematic diagram of the structure of the middle mounting bolt;

[0041] Figure 7 for Figure 3 A schematic diagram of the structure of the middle bushing in an initial state;

[0042] Figure 8 for Figure 3 A partial cross-sectional view of the first end of the middle bushing before riveting;

[0043] Fig. 9 for Figure 8 Schematic diagram of the assembly structure of the mounting bolt and bushing.

[0044] Description of Figure Numbers:

[0045] 10000, vehicles;

[0046] 1000, battery device; 2000, controller; 3000, motor;

[0047] 100, mounting structure; 200, box body; 210, box body; 220, box cover; 300, battery cell;

[0048] 1. Mounting beam; 11. Beam wall; 11a. Through hole; 2. Bushing; 2a. Contact portion; 2b. Cavity; 21. Bushing body; 21a. Snap-fit ​​protrusion; 21b. Annular weak portion; 22. First end; 23. Second end; 24. Overlap portion; 241. First overlap; 242. Second overlap; 3. Mounting nut; 4. Mounting bolt; 4a. Matching groove; 41. Screw head; 42. Screw; X. First direction.

[0049] 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

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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).

[0055] 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.

[0056] 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.

[0057] The battery device disclosed in the embodiment of the present application can be used to provide electric energy for electric devices, wherein the electric devices can be but not limited to battery vehicles, electric vehicles, ships, spacecraft, etc. Among them, the spacecraft can include airplanes, rockets, space shuttles, spacecraft, etc.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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 cope with this situation, 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, which can effectively prevent the beam wall of the mounting beam from deforming. 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.

[0062] 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.

[0063] Further analysis shows that the main factors for 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 improve the standard electrode potential difference between the two materials and prevent the two materials from being electrically connected.

[0064] 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.

[0065] 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 3A 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 diagram of the middle mounting beam; Figure 5 for Figure 3 Schematic diagram of the structure of the middle bushing; Figure 6 for Figure 3 Schematic diagram of the structure of the middle mounting bolt; Figure 7 for Figure 3 A schematic diagram of the structure of the middle bushing in an initial state; Figure 8 for Figure 3 A partial cross-sectional view of the first end of the middle bushing before riveting; Fig. 9 for Figure 8 Schematic diagram of the assembly structure of the mounting bolt and bushing.

[0066] See also Figures 2 to 4 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, and a mounting structure 100 is arranged on the box body 200, the mounting structure 100 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, 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 contact portion 2a in contact with the beam wall 11; the contact portion 2a is formed with a corrosion-resistant surface layer in contact with the beam wall 11, and / or the standard electrode potential of the material of the contact portion 2a is equivalent to the standard electrode potential of the material of the beam wall 11.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] The "mounting structure 100" 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 that it has 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 having a through cavity The sleeve-like structure of 2b, "the bushing 2 is provided at two ends of the first direction X through two through holes 11a" can be understood as that the cavity 2b of the bushing 2 is arranged toward the first direction X, and the main part of the bushing 2 is between the two beam walls 11, and the bushing 2 is provided at two ends of the first direction X through the through holes 11a of the two beam walls 11. In the embodiment of the present application, the main function of the bushing 2 is to allow the mounting bolt 4 to pass through, so that the mounting bolt 4 can be connected to the load-bearing beam of the electrical equipment through the mounting nut 3. Therefore, the two ends of the bushing 2 usually contact the screw head 41 of the mounting bolt 4 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, and the embodiment of the present application does not limit this.

[0071] “The bushing 2 has a contact portion 2a in contact with the beam wall 11” can be understood as the bushing 2 contacts the mounting beam 1 through the beam wall 11, and the contact portion 2a is formed at the location where the bushing 2 contacts the beam wall 11. The contact portion 2a can be a local area of ​​the bushing 2 itself, and of course the entire bushing 2 can also be set as the contact portion 2a, for example, Figure 3 , Figure 5 and Figure 8 In the figure, the entire bushing 2 belongs to the contact portion 2a.

[0072] Since the bushing 2 contacts the beam wall 11 through its contact portion 2a, in order to improve the problem of electrochemical corrosion between the bushing 2 and the beam wall 11, a corrosion-resistant surface layer can be formed on the contact portion 2a, and the beam wall 11 is contacted through the corrosion-resistant layer. The "corrosion-resistant surface layer" refers to a surface layer that can resist chemical erosion, which can at least resist electrochemical corrosion, such as a titanium alloy surface layer, an aluminum oxide surface layer, an epoxy resin surface layer, etc. There are many ways to form a corrosion-resistant surface layer on the contact portion 2a, such as coating a corrosion-resistant coating on the contact portion 2a by spraying, or electroplating on the contact portion 2a. The corrosion-resistant coating is electroplated on the contact portion 2a, and the corrosion-resistant layer is deposited on the contact portion 2a by vapor deposition, for example, which is not limited in this embodiment; of course, the contact portion 2a and the beam wall 11 can also be made of suitable materials to ensure that "the standard electrode potential of the material of the contact portion 2a is equivalent to the standard electrode potential of the material of the beam wall 11", wherein "standard electrode potential" is a physical quantity that measures the tendency of a substance to undergo a reduction reaction under standard conditions. It is measured in volts (V) and is usually defined relative to a standard hydrogen electrode (SHE), which is defined as 0 V; "the standard electrode potentials of the two materials are equivalent" means that the standard electrode potential difference between the two materials is less than about 0.1 volts (V). For example, the standard electrode potential difference between nickel and cobalt is 0.02 V. It is generally believed that in this case, the driving force for the electrochemical reaction is small, the corrosion rate will be very low, and it can be approximately considered that basically no electrochemical reaction occurs. The above two parallel technical features "the contact portion 2a forms a corrosion-resistant surface layer in contact with the beam wall 11" and "the standard electrode potential of the material of the contact portion 2a is equivalent to the standard electrode potential of the material of the beam wall 11" can be set at the same time or one of them can be set selectively.

[0073] 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 of both sides of the mounting beam 1 to withstand the tightening force. At the same time, the bushing 2 also has a contact portion 2a. After the installation is completed, the bushing 2 is in direct contact with the beam wall 11 through its contact portion 2a. On the one hand, the contact portion 2a is formed with a corrosion-resistant surface layer, and the corrosion-resistant surface layer can block the electrochemical reaction between the contact portion 2a and the beam wall 11 to a certain extent. On the other hand, the standard electrode potential of the material of the contact portion 2a is equivalent to the standard electrode potential of the material of the beam wall 11, so that the contact portion 2a and the beam wall 11 are not prone to electrochemical reaction. These two methods can both protect the bushing 2, reduce the degree of electrochemical corrosion encountered by the bushing 2, and improve the problem that the bolt bushing in the mounting beam of the existing battery box is prone to failure after a period of use.

[0074] Regarding forming a corrosion-resistant surface layer on the contact portion 2a, the above explanation has provided methods of spraying a corrosion-resistant coating and electroplating a corrosion-resistant coating. However, electroplating is a relatively complex process, and strict control is required from pretreatment to final quality inspection to ensure the quality of the coating. In addition, electroplating may release toxic gases or residual heavy metal ions, causing environmental pollution. Although the spraying method can prevent the corrosive medium from contacting the substrate through physical isolation, it is difficult to ensure that all areas can be evenly covered for parts with complex shapes, especially at edges and gaps where weak points are easily formed, resulting in an increased risk of local corrosion. In view of this, in some embodiments, the bushing 2 includes a metal bushing 2, and the metal bushing 2 is formed with a passivated surface layer, and the passivated surface layer includes the corrosion-resistant surface layer of the contact portion 2a.

[0075] It should be noted that "passivation" refers to the formation of a dense oxide film on the metal surface through chemical reactions. This film can effectively prevent external corrosive substances (such as oxygen, moisture, acid and alkali, etc.) from reacting with the metal surface, thereby extending the service life of the metal.

[0076] According to the above technical solution, the bushing 2 is set as a metal bushing 2 with a passivated surface layer. When the metal bushing 2 contacts the beam wall 11, the passivated surface layer can significantly reduce the electrochemical activity of the metal bushing 2, thereby effectively preventing further electrochemical corrosion. Compared with the method of forming a corrosion-resistant surface layer by electroplating and spraying, the passivation treatment method shows significant advantages in solving material corrosion problems, especially in terms of cost-effectiveness, environmental protection and corrosion resistance.

[0077] In some embodiments, the metal bushing 2 is made of titanium alloy.

[0078] It should be noted that "titanium alloy" not only has the good properties of high strength and low density, making the metal bushing 2 more suitable for application scenarios on the battery device 1000 that meet the requirements of high mounting strength and lightweight, but also has good corrosion resistance. When titanium alloy is exposed to air or an oxygen-containing environment, it will react quickly with oxygen and form a very thin and strong titanium dioxide oxide film on its surface. The titanium dioxide oxide film is the passivation surface layer.

[0079] According to the above technical solution, the metal bushing 2 made of titanium alloy can exhibit rapid self-repairing ability when its passivated surface layer is damaged by mechanical damage or other reasons, thereby ensuring that the metal bushing 2 continues to maintain electrochemical corrosion resistance.

[0080] Please refer to Figure 5 and Figure 6In some embodiments, the peripheral side wall of the bushing 2 is recessed inward, and a snap-fitting protrusion 21a is formed on the inner side wall of the bushing 2; the mounting structure 100 also includes a mounting bolt 4, a matching groove 4a is formed on the peripheral side wall of the mounting bolt 4, the mounting bolt 4 is passed through the bushing 2, and the snap-fitting protrusion 21a is snapped into the matching groove 4a.

[0081] It should be noted that “the peripheral side wall of the bushing 2 is concave inwardly, and a snap-fit ​​protrusion 21a is formed on the inner side wall of the bushing 2” should be understood as that the peripheral side wall of the bushing 2 has a deformation area, and the deformation area is concave from the outside to the inside, so that the snap-fit ​​protrusion 21a appears on the inner wall of the cavity 2b of the bushing 2; the mounting structure 100 of the battery device 1000 in this embodiment also includes a mounting bolt 4, please refer to Figure 6 The mounting bolt 4 usually includes a screw head 41 and a screw rod 42. The screw rod 42 passes through the cavity 2b of the bushing 2, so that the screw head 41 abuts against one side end of the bushing 2 in the first direction X. Based on this, "a matching groove 4a is formed on the peripheral side wall of the mounting bolt 4" means that a matching groove 4a is formed on the peripheral side wall of the screw rod 42 extending into the bushing 2 on the mounting bolt 4, so that after the mounting bolt 4 and the bushing 2 are installed in place, the matching groove 4a can be engaged with the clamping protrusion 21a, thereby clamping the mounting bolt 4 and the bushing 2 as a whole. The clamping protrusion 21a can be only a local convex point, and correspondingly, the matching groove 4a can be a local groove. As long as the matching groove 4a can play a role in limiting the disengagement of the clamping protrusion 21a in the first direction X, the specific structural form of the clamping protrusion 21a and the matching groove 4a is not limited in this embodiment.

[0082] According to the above technical solution, a clamping protrusion 21a is formed on the inner wall of the bushing 2, and a matching groove 4a is formed on the peripheral wall of the mounting bolt 4. The mounting bolt 4 can be pre-inserted into the bushing 2, and the clamping protrusion 21a is clamped into the matching groove 4a by interference extrusion. This allows the mounting bolt 4 and the bushing 2 to be manufactured as one piece and not easily fall off. They can also be installed together on the mounting beam 1, simplifying the assembly steps of the mounting structure 100.

[0083] Further, in some embodiments, the matching groove 4a is arranged in a ring shape.

[0084] It should be noted that “the matching groove 4a is arranged in an annular shape” means that the matching groove 4a extends in an annular shape on the peripheral side wall of the mounting bolt 4 and is closed at both ends. Correspondingly, the clamping protrusion 21a can be arranged in an annular shape, for example Figure 5 and Figure 7As shown, of course, the clamping protrusion 21a can also be set as a local protrusion. Obviously, the clamping protrusion 21a can be set as an annular protrusion, the contact area between the clamping protrusion 21a and the matching groove 4a is improved, the clamping strength is greater, and the bushing 2 and the mounting bolt 4 are not easy to separate.

[0085] According to the above technical solution, the matching grooves 4a are all set as annular grooves. When the mounting bolt 4 is inserted into the bushing 2, there is no need to align the clamping protrusion 21a and the matching groove 4a along the circumference of the bushing 2. The clamping protrusion 21a and the matching groove 4a can be ensured to be clamped by directly inserting them along the axial direction of the bushing 2, which simplifies the difficulty of connecting the mounting bolt 4 and the bushing 2.

[0086] See also Figure 3 and Figure 7 In some embodiments, the two beam walls 11 have installation side ends that are arranged away from each other; the bushing 2 has a bushing body 21, and a first end 22 and a second end 23 located on both sides of the bushing body 21 along the first direction X, and at least one of the first end 22 and the second end 23 is extended radially to form a lap portion 24, and the lap portion 24 is overlapped to the corresponding installation side end; wherein the contact portion 2a includes the lap portion 24.

[0087] Generally speaking, two beam walls 11 opposite to each other along the first direction X have inner side ends facing each other. Based on this, "the two beam walls 11 have installation side ends that are set away from each other" can be understood as the side end of the beam wall 11 that is away from its inner side end in the first direction X is the installation side end, and the installation side end is usually also the outer side end of the mounting beam. The bushing 2 has a bushing body 21, a first end 22 and a second end 23, wherein the first end 22 is adjacent to one end of the bushing body 21, and the second end 23 is adjacent to the other end of the bushing body 21, for example Figure 7 As shown in , the first end 22 is adjacent to the lower end of the bushing body 21, and the second end 23 is adjacent to the upper end of the bushing body 21. The two ends of the bushing 2 along the first direction X respectively pass through the through holes 11a on the corresponding beam wall 11. It can also be understood that the first end 22 and the second end 23 of the bushing 2 respectively pass through the through holes 11a on the corresponding beam wall 11. In this scheme, "at least one of the first end 22 and the second end 23 is formed with a lap portion 24 along the radial extension of the bushing 2" includes: "the first end 22 is formed with a lap portion 24 along the radial extension of the bushing 2", "the second end 23 is formed with a lap portion 24 along the radial extension of the bushing 2" and "the first end 22 and the second end 23 are both formed with a lap portion 24 along the radial extension of the bushing 2". "The lap portion 24 is overlapped to the corresponding installation side end" means that the lap portion 24 abuts against the corresponding installation side end in the first direction X.

[0088] According to the above technical solution, at least one of the first end 22 and the second end 23 of the bushing 2 is set to be a lap joint 24 extending along its radial direction. Since the lap joint 24 overlaps the installation side end of the corresponding beam wall 11, on the one hand, the lap joint 24 can play a role in limiting the installation of the bushing 2. On the other hand, after the battery device 1000 is mounted on the load-bearing beam of the electrical equipment, the lap joint 24 can be blocked between the screw head 41 of the mounting bolt 4 or the load-bearing beam and the corresponding beam wall 11, so as to protect the beam wall 11.

[0089] See also Figure 5 , Figure 8 and Fig. 9 In some embodiments, the overlapping portion 24 includes a first overlapping edge 241 at the first end 22 of the bushing 2, and the first overlapping edge 241 is formed by riveting.

[0090] It should be noted that the "flip riveting process" refers to the process in which one end of the rivet piece passes through the part to be connected along its axial direction and is folded along its own radial direction after being subjected to a clamping force, wherein: Figure 8 and Fig. 9 The first end 22 of the middle bushing 2 is in a state before riveting. Figure 5 The first end 22 of the middle bushing 2 has been subjected to a riveting process and formed into a first overlap 241 .

[0091] According to the above technical solution, before forming the first overlap 241, the extension direction of the first end 22 of the bushing 2 and the bushing body 21 are both the first direction X, and can easily pass through the through hole 11a of the corresponding beam wall 11. After that, the first end 22 is formed into the first overlap 241 through the riveting process, which reduces the operational difficulty of installing the bushing 2 on the beam wall 11.

[0092] See also Figure 8 and Fig. 9 In some embodiments, an annular weak portion 21 b is formed at the junction of the peripheral side wall of the bushing body 21 and the first overlap edge 241 .

[0093] During the riveting process, the weak area of ​​the component is more likely to be deformed by force. Based on this, in this embodiment, an annular weak portion 21b is formed at the position where the peripheral side wall of the bushing body 21 is adjacent to the first overlap 241. Therefore, during the riveting deformation process of the first end 22 of the bushing 2, the annular weak portion 21b itself is more likely to deform, thereby guiding the first end 22 of the bushing 2 to turn outward to form the first overlap 241. The "annular weak portion 21b" can be understood as an annular groove opened on the peripheral side wall of the annular groove bushing body 21, and the wall thickness of the bushing 2 at this position is thinner than that at adjacent positions.

[0094] According to the above technical solution, an annular weak portion 21b is formed at a position where the circumferential side wall of the bushing body 21 is adjacent to the first lap 241. During the riveting process of the first end 22 of the bushing 2, the annular weak portion 21b on the circumferential side wall of the bushing body 21 can guide the first end 22 to fold outward, which is beneficial to the accurate forming of the first lap 241.

[0095] See also Figure 5 and Figure 7 In some embodiments, the overlapping portion 24 includes a second overlapping edge 242 at the second end 23 of the bushing 2, and the second overlapping edge 242 is elastically configured so that the periphery of the second overlapping edge 242 can elastically retract inward.

[0096] To facilitate understanding of “the second overlap 242 is elastically arranged so that the periphery of the second overlap 242 can elastically retract inwardly”, the following is combined with Figure 5 and Figure 7 To explain, Figure 7 The bushing 2 in the figure is in the initial state before being installed on the mounting beam 1. In this state, the first end 22 of the bushing 2 extends along the first direction X, and the second end 23 extends along its radial direction to form a second overlap 242. The cross section of the second overlap 242 is in a cantilever state, which is also the main reason why the periphery of the second overlap 242 can elastically retract inward. Figure 5 In the embodiment, the bushing 2 is installed on the mounting beam 1 and is flattened by the screw head 41 of the mounting bolt 4. At this time, the second overlap 242 of the bushing 2 always has a recovery Figure 7 The tendency of the middle state can compensate the assembly tolerance of the mounting bolt 4 to a certain extent. Of course, the second overlap 242 can also obtain the elastic retraction performance through other structural shapes, which is not limited in this embodiment.

[0097] "The periphery of the second lap 242" refers to the outer edge of the second lap 242 along the radial direction of the bushing 2. Based on this, "inward elastic retraction" means that the periphery of the second lap 242 can retract along the direction close to the axis of the bushing 2. Due to the obstruction of the corresponding beam wall 11, the second lap 242 can apply a pushing force to the screw head 41 of the mounting bolt 4 along the first direction X. Of course, in other usage scenarios, the second lap 242 can also be used to abut the load-bearing beam of electrical equipment.

[0098] According to the above technical solution, since the second lap 242 of the second end 23 of the bushing 2 is elastically arranged and the periphery of the second lap 242 can elastically retract inward, the second lap 242 of the bushing 2 always has a tendency to arch along the first direction X. When the battery device 1000 is mounted to the load-bearing beam of the electrical equipment through the mounting bolt 4, the second lap 242 can absorb the assembly tolerance to a certain extent through its own elastic deformation, thereby ensuring a firm connection between the mounting bolt 4, the bushing 2 and the load-bearing beam.

[0099] See also Figures 6 to 8 In some embodiments, the position where the bushing body 21 is adjacent to the second overlap edge 242 is recessed inward to form a snap-fitting protrusion 21a on the inner wall of the bushing 2; the mounting structure 100 also includes a mounting bolt 4 passing through the bushing 2, and a matching groove 4a is formed on the peripheral side wall of the mounting bolt 4, and the snap-fitting protrusion 21a is snapped into the matching groove 4a.

[0100] It should be noted that the above embodiment has explained the engaging protrusion 21 a and the matching groove 4 a, which will not be described in detail in this embodiment.

[0101] According to the above technical solution, a clamping protrusion 21a is formed on the inner wall of the bushing 2, and a matching groove 4a is formed on the peripheral wall of the mounting bolt 4. The mounting bolt 4 can be pre-inserted into the bushing 2, and the clamping protrusion 21a is clamped into the matching groove 4a by interference extrusion. This allows the mounting bolt 4 and the bushing 2 to be manufactured as one piece and not easily fall off. They can also be installed together on the mounting beam 1, simplifying the assembly steps of the mounting structure 100.

[0102] In some embodiments, the mounting beam 1 is made of carbon fiber.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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 100 is arranged on the box body 200. The mounting structure 100 includes a mounting beam 1, a mounting bolt 4 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 that are arranged away from each other. 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. The bushing 2 is made of titanium alloy. The bushing 2 includes a bushing body 21, and a first end 22 and a second end 23 located on both sides of the bushing body 21 along the first direction X. The first end 22 passes through one of the two ends. A through hole 11a is provided, and a first lap 241 extending radially along the bushing body 21 is formed by riveting. An annular weak portion 21b is formed at the junction of the circumferential side wall of the bushing body 21 and the first lap 241. The second end 23 passes through another through hole 11a, and the second end 23 is extended radially along the bushing body 21 to form a second lap 242. The second lap 242 is elastically provided so that the periphery of the second lap 242 can elastically retract inwardly. The position where the bushing body 21 is adjacent to the second lap 242 is recessed inwardly to form a clamping protrusion 21a on the inner side wall of the bushing 2. The mounting bolt 4 is passed through the bushing 2, and a matching groove 4a is formed on the circumferential side wall of the mounting bolt 4. The clamping protrusion 21a is clamped to the matching groove 4a.

[0107] 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, and the two through holes are arranged in alignment in the first direction; and A bushing, the bushing is disposed at two ends of the first direction and is penetrated through the two through holes, the bushing having a contact portion contacting the beam wall; The contact portion is formed with a corrosion-resistant surface layer in contact with the beam wall, and / or the standard electrode potential of the material of the contact portion is equivalent to the standard electrode potential of the material of the beam wall.

2. The battery device according to claim 1, characterized in that The bushing includes a metal bushing formed with a passivation surface layer, and the passivation surface layer includes a corrosion-resistant surface layer of the contact portion.

3. The battery device according to claim 2, characterized in that: The material of the metal bushing is titanium alloy.

4. The battery device according to any one of claims 1 to 3, characterized in that: The peripheral side wall of the bushing is concave inwardly, and a clamping protrusion is formed on the inner side wall of the bushing; The mounting structure also includes a mounting bolt, a matching groove is formed on the peripheral side wall of the mounting bolt, the mounting bolt is passed through the bushing, and the clamping protrusion is clamped to the matching groove.

5. The battery device according to claim 4, characterized in that: The matching groove is arranged in an annular shape.

6. The battery device according to any one of claims 1 to 3, characterized in that: The two beam walls have mounting side ends that are arranged away from each other; The bushing comprises a bushing body, and a first end and a second end located at both sides of the bushing body along the first direction, at least one of the first end and the second end is extended along its radial direction to form a lap portion, and the lap portion is lapped to the corresponding installation side end; Wherein, the contact portion includes the overlapping portion.

7. The battery device according to claim 6, characterized in that: The overlapping portion includes a first overlapping edge at a first end of the bushing, and the first overlapping edge is formed by riveting.

8. The battery device according to claim 7, characterized in that: An annular weak portion is formed at the junction of the peripheral side wall of the bushing body and the first overlapped edge.

9. The battery device according to claim 6, characterized in that: The overlapping portion includes a second overlapping edge at the second end of the bushing, and the second overlapping edge is elastically arranged so that the periphery of the second overlapping edge can elastically retract inwardly.

10. The battery device according to claim 9, characterized in that The position where the bushing body is adjacent to the second overlap edge is inwardly recessed, so as to form a clamping protrusion on the inner side wall of the bushing; The mounting structure also includes a mounting bolt that penetrates the bushing, a matching groove is formed on the peripheral side wall of the mounting bolt, and the clamping protrusion is clamped to the matching groove.

11. The battery device according to any one of claims 1 to 3, characterized in that: The material of the mounting beam is carbon fiber.

12. An electrical equipment, characterized in that: Comprising the battery device according to any one of claims 1 to 11.

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