Bolt assembly, battery device and electric equipment

Abstract

The embodiment of the utility model provides a bolt assembly, a battery device and electric equipment, and relates to the technical field of batteries. The battery device comprises a battery box body and a battery monomer mounted in the battery box body, wherein the battery box body comprises a first component, a second component and a connecting piece; the first component is provided with a first connecting hole; the second component is adjacent to the first component and is provided with a second connecting hole; the connecting piece penetrates through the first connecting hole and the second connecting hole, the connecting piece comprises a main body part and an insulating part wrapping at least part of the main body part, potential difference exists between the main body part and the first component, and the insulating part wraps the surface, facing the first component, of the main body part and abuts against the first component. The insulating part of the connecting piece can separate the main body part with potential difference from the first component, so that the possibility of galvanic corrosion of the main body part and the first component with low potential due to the existence of the potential difference is reduced, the corrosion resistance and the structural stability of the battery box body are improved, and the service life of the battery box body is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a bolt assembly, a battery device, and an electrically powered device. BACKGROUND

[0002] Battery devices are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, and electric tools, etc.

[0003] A battery device includes a battery box and battery monomers installed in the battery box. Some components of the battery box are prone to corrosion during use, which affects the overall quality of the battery device. Therefore, how to reduce the possibility of corrosion of the battery box is a research direction in the battery technology. CONTENT OF THE INVENTION

[0004] The present application provides a bolt assembly, a battery device, and an electrically powered device, which can reduce the influence of the mounting beam on the mounting part during welding.

[0005] In a first aspect, the embodiments of the present application provide a battery device, which includes a battery box and battery monomers installed in the battery box. The battery box includes a first component, a second component, and a connecting piece. The first component is provided with a first connecting hole, and the first component has electrical conductivity. The second component is adjacent to the first component and is provided with a second connecting hole that is in communication with the first connecting hole. The connecting piece is arranged in the first connecting hole and the second connecting hole and connects the first component and the second component. The connecting piece includes a main body part and an insulating part that wraps at least part of the main body part. The main body part has electrical conductivity, and there is a potential difference between the main body part and the first component. The insulating part wraps the surface of the main body part facing the first component and abuts against the first component.

[0006] By adopting the above technical solution, the connecting piece is wrapped with the insulating part on the main body part. In this way, the strength and connection requirements of the connecting piece itself can be maintained through the main body part, and the insulating part can be used to abut against the first component to isolate the main body part with the potential difference from the first component, thereby reducing the possibility of direct contact between the main body part and the first component, reducing the possibility of galvanic corrosion of the one with lower potential caused by the potential difference between the connecting piece and the first component, improving the corrosion resistance and structural stability of the battery box, and prolonging the service life of the battery box.

[0007] In some embodiments of the present application, the main body part comprises a rod body and a limiting flange, the rod body is arranged in the first connecting hole and the second connecting hole and has a first end, the limiting flange is connected with the first end and protrudes from the outer circumferential surface of the rod body, the limiting flange is located on the side of the first component away from the second component, the surface comprises a first surface and a second surface, the first surface is the outer circumferential surface of the rod body arranged in the first connecting hole, and the second surface is the surface of the limiting flange facing the first component, and the insulating part wraps the first surface and the second surface.

[0008] By using the limiting flange to limit the cooperation with the first component, the stability of the rod body arranged in the first connecting hole and the second connecting hole is improved, and the insulating part wraps the first surface of the rod body and the second surface of the limiting flange, so that the possibility of corrosion of the first component and the connecting part with low potential is reduced.

[0009] In some embodiments of the present application, the limiting flange has a third surface connected with the second surface and forming an angle, and the insulating part wraps the third surface.

[0010] By wrapping the insulating part on the third surface, the limiting flange is better insulated and protected, and the possibility of corrosion of the limiting flange is reduced.

[0011] In some embodiments of the present application, at least one of the first surface, the second surface and the third surface is provided with a mechanical anchoring structure, the mechanical anchoring structure is a protrusion or a groove, and the insulating part is embeddedly connected with the mechanical anchoring structure.

[0012] By using the embedded connection of the mechanical anchoring structure and the insulating part, the connection stability of the insulating part and the limiting flange can be improved, and the possibility of separation of the two due to the rotation of the connecting part is reduced.

[0013] In some embodiments of the present application, the third surface is arranged around the rod body in the circumferential direction, and the mechanical anchoring structure is arranged in the circumferential direction of the third surface.

[0014] By arranging the mechanical anchoring structure in the circumferential direction of the third surface, the connection stability of the insulating part and the limiting flange is further improved.

[0015] In some embodiments of the present application, the limiting flange has a fourth surface away from the first component and connected with the third surface, and the insulating part wraps the fourth surface.

[0016] The insulating part is arranged on all surfaces of the limiting flange, so that the corrosion resistance of the limiting flange is improved.

[0017] In some embodiments of the present application, the main body part further comprises a connecting head at the first end, the connecting head is located on the side of the limiting flange away from the first component, and a polygonal weight-reducing hole is arranged in the middle of the connecting head.

[0018] The polygonal weight-reducing hole in the connecting head not only facilitates the connection with external structures and the screwing of the connecting piece, but also has a weight-reducing effect.

[0019] In some embodiments of the present application, the connecting piece further comprises a locking part, the rod body is provided with a second end adjacent to the second component and protruding from the second component, and the locking part is sleeved on the second end and abuts against the second component.

[0020] The locking part is used to press the second component, so that the main body part can be locked and fixed on the first component and the second component.

[0021] In some embodiments of the present application, the locking part is threadedly connected with the second end.

[0022] The threaded connection structure is simple and easy to disassemble and assemble.

[0023] In some embodiments of the present application, the insulating part extends to the second connecting hole and abuts against the hole wall of the second connecting hole.

[0024] The insulating part abuts against the hole wall of the second connecting hole, so that the possibility of contact between the main body part and the second component is reduced, and the possibility of galvanic corrosion caused by the potential difference between the connecting piece and the second component is reduced.

[0025] In some embodiments of the present application, the first component is exposed outside the battery box, and the potential difference between the first component and the main body part is greater than or equal to 0.2 volts; or the first component is built-in inside the battery box, and the potential difference between the first component and the main body part is greater than or equal to 0.7 volts.

[0026] The working conditions of the first component and the connecting piece outside the battery box are more complex, and corrosion is more likely to occur. Therefore, the minimum potential difference applicable to the first component and the main body part outside the battery box is designed to be smaller than the minimum potential difference applicable to the first component and the main body part inside the battery box, so as to reduce the possibility of corrosion of the first component and the connecting piece.

[0027] In some embodiments of the present application, the second member has a potential difference with the main body, and the insulating part is wrapped around a surface of the connecting member facing the second member.

[0028] By wrapping the insulating part around the surface of the main body facing the second member, the possibility of galvanic corrosion of the one with lower potential due to the potential difference between the main body and the second member is reduced.

[0029] In some embodiments of the present application, the main body and the insulating part are integrated.

[0030] By making the main body and the insulating part integrated, the structural integrity and the connection stability of the two are improved.

[0031] In some embodiments of the present application, the first member is at least partially a magnesium alloy, and the main body is a stainless steel part.

[0032] By using magnesium alloy to manufacture the battery box, the lightweight of the battery box is achieved.

[0033] In some embodiments of the present application, the surface of the first member is provided with a corrosion-resistant layer.

[0034] By providing the surface of the first member with a corrosion-resistant layer, the corrosion resistance of the first member is further improved.

[0035] In a second aspect, the embodiments of the present application provide a bolt assembly, comprising a bolt and a nut in threaded connection, the bolt comprising a main body and an insulating part wrapped around at least part of the outer surface of the main body, the main body comprising a rod body and a limiting flange at the first end of the rod body, and the insulating part wrapping the limiting flange and at least part of the rod body.

[0036] In a third aspect, the embodiments of the present application provide an electric device, comprising the battery device of any one of the above technical solutions or the bolt assembly, and the battery device is used to provide or store electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0038] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application.

[0039] Figure 2 Structure diagram of battery device provided for some embodiments of the present application;

[0040] Figure 3 Structure diagram of part of battery box provided for some embodiments of the present application;

[0041] Figure 4 Structure diagram of part of battery box provided for some embodiments of the present application; Figure 3 A-A sectional view of the structure diagram of the battery box provided for some embodiments of the present application;

[0042] Figure 5 Structure diagram of part of battery box provided for some embodiments of the present application;

[0043] Figure 6 Structure diagram of part of battery box provided for some embodiments of the present application;

[0044] Figure 7 Structure diagram of connecting piece provided for some embodiments of the present application;

[0045] Figure 8 Structure diagram of main body provided for some embodiments of the present application;

[0046] Figure 9 Structure diagram of mechanical anchoring structure of main body provided for some embodiments of the present application.

[0047] Reference signs of the detailed description are as follows:

[0048] 1000, vehicle;

[0049] 100, battery device;

[0050] 10, battery box;

[0051] 1, first box;

[0052] 2, second box;

[0053] 3, first member; 31, first connecting hole;

[0054] 4, second member; 41, second connecting hole;

[0055] 5, connecting piece; 51, main body; 511, rod body; 5111, first end; 5112, second end; 5113, first surface; 5114, fifth surface; 512, limiting flange; 5121, second surface; 5122, third surface; 5123, fourth surface; 513, mechanical anchoring structure; 514, connecting head; 5141, weight-reducing hole; 52, insulating part; 53, locking part;

[0056] 20, battery monomer;

[0057] 200, controller;

[0058] 300, motor. DETAILED DESCRIPTION

[0059] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0061] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0062] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, H and / or B can mean that H exists alone, H and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after it.

[0064] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0065] “Multiple” appearing in the present application refers to two or more (including two).

[0066] In order to realize the light weight of the vehicle, the related technology adopts a light and high-strength material such as magnesium alloy as the material of the battery device of the vehicle or the vehicle itself. For example, magnesium alloy is used as the side wall or frame of the battery box of the battery device, or the front axle or rear axle of the vehicle is made of magnesium alloy.

[0067] However, magnesium alloy is prone to galvanic corrosion after contacting with a metal connecting piece, which will weaken the strength and durability of the magnesium alloy component, and may cause premature failure of key components such as the battery box or the axle, thereby causing safety hazards.

[0068] Therefore, how to reduce the possibility of galvanic corrosion of the magnesium alloy component after being connected with the metal connecting piece is an important issue in the research and development of the battery device and its related components.

[0069] In view of this, the present application provides a technical solution, which improves the structure of the metal connecting piece, and a layer of insulating part is coated on the outside of the metal connecting piece to isolate the magnesium alloy component from the metal connecting piece, thereby solving the above technical problems.

[0070] It can be understood that the electric equipment described in the embodiments of the present application can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not specially limit the above electric equipment.

[0071] The following embodiments are described taking the vehicle as an example for the sake of convenience.

[0072] In combination with the drawings Figure 1As shown, the vehicle 1000 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 a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0073] In some embodiments, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0074] In combination with the accompanying Figures 2-6 As shown, the battery device 100 provided by the embodiments of the present application includes a battery box 10 and a battery cell 20 arranged in the battery box 10. The battery box 10 includes a first component 3, a second component 4 and a connecting piece 5. The first component 3 is provided with a first connecting hole 31, and the first component 3 has electrical conductivity. The second component 4 is adjacent to the first component 3, and the second component 4 is provided with a second connecting hole 41 which is in communication with the first connecting hole 31. The connecting piece 5 is arranged in the first connecting hole 31 and the second connecting hole 41, and connects the first component 3 and the second component 4. The connecting piece 5 includes a main body part 51 and an insulating part 52 which wraps at least part of the main body part 51. The main body part 51 has electrical conductivity, and there is a potential difference between the main body part 51 and the first component 3. The insulating part 52 wraps the surface of the main body part 51 facing the first component 3, and abuts against the first component 3.

[0075] The battery device 100 mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 20 connected in series, in parallel or in a mixed manner by a busbar.

[0076] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells 20; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 20 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 20 by a cable tie.

[0077] In some embodiments, the battery device 100 can be a battery pack, which includes a battery box 10 and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the battery box 10.

[0078] In some embodiments, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the battery case 10 by fixing the battery module in the battery case 10.

[0079] In some embodiments, the battery cell assembly can also be accommodated in the battery case 10 by fixing a plurality of battery cells 20 directly to the battery case 10.

[0080] The battery case 10 of the present embodiment is used to provide an accommodation space for the battery cells 20, and the battery case 10 can adopt various structures. In some embodiments, the battery case 10 can include a first case 1 and a second case 2, the first case 1 and the second case 2 are overlapped with each other, and the first case 1 and the second case 2 together define an accommodation space for accommodating the battery cells 20.

[0081] The first case 1 and the second case 2 can each be a hollow structure with one end open, and the second case 2 is overlapped with the open side of the first case 1 to make the first case 1 and the second case 2 together define the accommodation space; or the second case 2 can be a plate structure, and the first case 1 can be a hollow structure with one side open, and the open side of the second case 2 is overlapped with the open side of the first case 1. Of course, the battery case 10 formed by the first case 1 and the second case 2 can have various shapes, such as a cylinder, a cuboid, etc.

[0082] The first member 3, the second member 4 and the connecting member 5 of the present embodiment can be part of the first case 1, or part of the second case 2.

[0083] In some embodiments, the battery case 10 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the battery case 10 to accommodate the battery cell assembly. The first member 3, the second member 4 and the connecting member 5 of the present embodiment can be part of the top cover, part of the frame, or part of the bottom plate.

[0084] For example, the first member 3 can be the frame of the battery case, and the second member 4 can be the bottom guard plate connected with the frame.

[0085] For another example, the second member 4 can be the case body forming the space for accommodating the battery cells, and the first member 3 can be the plate member connected to the outside of the case body.

[0086] For another example, the first member 3 can be the first case 1, and the second member 4 can be the second case 2.

[0087] In some embodiments, the battery box 10 can be part of the chassis structure of the vehicle 1000. For example, the top cover of the battery box 10 can become at least part of the floor of the vehicle 1000, or the frame of the battery box 10 can become at least part of the cross beam and longitudinal beam of the vehicle 1000.

[0088] In some embodiments, the battery device 100 refers to an energy storage device, which includes the battery box 10, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0089] The battery monomer 20 mentioned in the embodiments of the present application can include an electrode assembly and an electrolyte, the electrode assembly including a positive electrode sheet, a negative electrode sheet, and a separator. The battery monomer 20 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode coating area coated with a positive electrode active material layer and a positive electrode tab connected to the positive electrode coating area, and the positive electrode tab is not coated with a positive electrode active material layer.

[0090] The first member 3 and the second member 4 of the present embodiment can be a plate-shaped member, a columnar member, a block-shaped member, or a strip-shaped member, etc., respectively, and the present embodiment does not make too many enumerations.

[0091] The first member 3 is provided with a first connecting hole 31, and the second member 4 is provided with a second connecting hole 41, the first connecting hole 31 and the second connecting hole 41 are through each other, and the first connecting hole 31 and the second connecting hole 41 can be through holes.

[0092] The second member 4 is adjacent to the first member 3, which means that the two can be attached to each other, or can have a certain interval, and an intermediate structure (not shown in the figure) can be provided in the interval between the two.

[0093] There is a potential difference between the main body part 51 and the first member 3, which can be that the potential of the main body part 51 is higher than the potential of the first member 3, or the potential of the first member 3 is higher than the potential of the main body part 51.

[0094] Taking the first member 3 of the present embodiment as a magnesium alloy member and the main body part 51 as a carbon steel part as an example, at this time the potential of the main body part 51 is higher than the potential of the first member 3, and the first member 3 is prone to electrochemical corrosion.

[0095] The reason is that when two conductive phases with a potential difference (the two that can form a galvanic corrosion) are in contact, the metal with a lower potential becomes the anode of the galvanic cell, and thus spontaneously undergoes oxidation reaction (loses electrons) and is dissolved.

[0096] Therefore, the embodiment improves the structure of the connecting piece 5, and the insulating part 52 is arranged on the main body part 51 of the connecting piece 5, and the insulating part 52 is located on the surface of the main body part 51 facing the first component 3 and abuts against the first component 3.

[0097] It should be noted that the surface of the main body part 51 facing the first component 3 includes the surface of the part of the main body part 51 located outside the first connecting hole 31 facing the first component 3, and also includes the surface of the part of the main body part 51 located inside the first connecting hole 31 facing the first component 3.

[0098] In the battery device of the embodiment, the connecting piece 5 is wrapped with the insulating part 52 on the main body part 51, so that the strength and connection requirements of the connecting piece 5 itself can be maintained through the main body part 51, and the connecting piece 5 can be applied to fix components with different potential differences through the insulating part 52. The insulating part 52 reduces the possibility of direct contact between the main body part 51 with the potential difference and the first component 3, thereby reducing the possibility of galvanic corrosion of the one with lower potential between the connecting piece 5 and the first component 3 due to the potential difference, improving the corrosion resistance and structural stability of the battery box 10, and prolonging the service life.

[0099] The insulating part 52 of the embodiment can be any insulating material capable of being arranged on a metal material, for example, it can be plastic, ceramic, etc., and specifically can be polyvinyl chloride, polyformaldehyde, etc., and the embodiment does not make too many enumerations.

[0100] As to how to determine the potentials of the first component 3, the main body part 51 and the second component 4, it can be obtained through the following test method:

[0101] I. Test principle: The polarization curve of the test tower metal is measured, and the potentiodynamic scanning method is used to complete on the electrochemical workstation.

[0102] II. Operation steps

[0103] ① Experimental system construction

[0104] A three-electrode system is used: working electrode (metallic samples such as the first component 3, the second component 4 and the connecting piece 5), reference electrode (such as saturated calomel electrode SCE), auxiliary electrode (platinum electrode or graphite electrode).

[0105] ② Correctly connect the electrodes to the corresponding interfaces of the electrochemical workstation.

[0106] III. Key parameter settings

[0107] ① Scan range: scan a certain overpotential range in both cathodic and anodic directions with open circuit potential (OCP) as the reference. Commonly set as ±250mV or so relative to OCP. To make the curve show obvious Tafel linear region, the scan range should be greater than 120mV.

[0108] ② Scan rate: to obtain quasi-steady state polarization curve, the scan rate is set between 0.1mV / s and 1mV / s. For example, 0.3mV / s or 0.5mV / s.

[0109] Four, test procedure: first measure the cathode branch, then measure the anode branch, and finally combine them.

[0110] Five, data processing and analysis

[0111] ① After obtaining the current-potential curve, the potential and current logarithm show linear relationship in the strong polarization region (usually overpotential >100mV), i.e. Tafel linear segment.

[0112] ② Use the software (such as CView) or Origin etc. matched with electrochemical workstation to extrapolate the intersection point of the Tafel linear segment of cathode and anode. The abscissa of the intersection point is the corrosion potential (E_corr), and the ordinate is the corrosion current density (I_corr), which can be directly used to calculate the corrosion rate.

[0113] ③ Sample preparation and system stabilization: the surface treatment of metal sample must be standardized and consistent. Monitor the open circuit potential before testing, and start polarization scanning after it is stable.

[0114] ④ Solution resistance compensation: if the solution conductivity is poor, the polarization curve measured at high current will be distorted due to solution resistance (IR drop). Make sure to perform IR compensation to obtain the true data.

[0115] Six, related test standards: GB / T24196-2009; JB / T7704.6-1995; ASTMG5.

[0116] Combined with the attached Figure 4 , 5As shown in 7 and 8, in some examples, optionally, the main body 51 includes a rod 511 and a limiting flange 512. The rod 511 passes through the first connecting hole 31 and the second connecting hole 41 and has a first end 5111 adjacent to the first member 3. The limiting flange 512 is connected to the first end 5111 and protrudes from the outer peripheral surface of the rod 511. The limiting flange 512 is located on the side of the first member 3 away from the second member 4. The surface includes a first surface 5113 and a second surface 5121. The first surface is the outer peripheral surface of the rod 511 located in the first connecting hole 31, and the second surface is the surface of the limiting flange 512 facing the first member 3. The insulating part 52 covers the first surface 5113 and the second surface 5121.

[0117] The rod 511 can be a rod-shaped structure with a cylindrical cross-section. The rod 511 passes through the first connecting hole 31 and the second connecting hole 41, and one end of the rod 511 extends out of the second connecting hole 41.

[0118] The first surface 5113 is a portion of the outer circumferential surface of the rod 511, such as Figure 4 As shown, the outer peripheral surface of the rod 511 includes a first surface 5113 and a fifth surface 5114 of the rod 511 facing the second connecting hole 41. The first surface 5113 and the fifth surface 5114 are integral and smoothly connected, forming the entire outer peripheral surface of the rod 511.

[0119] The limiting flange 512 protrudes radially from the outer circumferential surface of the rod 511. The limiting flange 512 can be one or more protruding structures, or it can be a continuous protruding ring structure as described below. The limiting flange 512 is mainly used for limiting and engaging with the first component 3.

[0120] The limiting flange 512 has a second surface 5121 facing the first member 3, that is Figure 4 and 5 The lower surface of the limiting flange 512 in the middle.

[0121] In order to achieve insulation between the main body 51 and the first component 3, the insulating part 52 is designed to wrap the first surface 5113 and the second surface 5121, thereby preventing the first surface 5113 and the second surface 5121 from contacting the first component 3 respectively.

[0122] In this way, by using the limiting flange 512 with the insulating part 52 to limit the engagement with the first component 3, the stability of the rod 511 after passing through the first connecting hole 31 and the second connecting hole 41 is improved. Moreover, the insulating part 52 covers the first surface 5113 of the rod 511 and the second surface 5121 of the limiting flange 512, reducing the possibility of corrosion of the first component 3 and the connector 5 due to the low potential caused by the contact between the rod 511 and the limiting flange 512 and the first component 3.

[0123] In some examples, the limiting flange 512 optionally has a third surface 5122 that is in contact with the second surface 5121 and forms an angle with it, and the insulating portion 52 covers the third surface 5122.

[0124] The third surface 5122 is Figure 4 and 5 The side surface of the middle limiting flange 512, the third surface 5122, does not contact the first component 3.

[0125] The insulating part 52 is wrapped around the third surface 5122 to provide better insulation protection for the limiting flange 512 and reduce the possibility of the limiting flange 512 being corroded and rusted.

[0126] Combined with appendix Figure 9 As shown, in some examples, optionally, at least one of the first surface 5113, the second surface 5121 and the third surface 5122 is provided with a mechanical anchoring structure 513, which is a protrusion or a groove, and the insulating part 52 is fitted and connected to the mechanical anchoring structure 513.

[0127] The above technical solutions include various implementation methods. For example, one method involves providing a mechanical anchoring structure 513 on the first surface 5113, while not providing a mechanical anchoring structure 513 on the third surface 5122. Another method involves not providing a mechanical anchoring structure 513 on the first surface 5113, but providing a mechanical anchoring structure 513 on the third surface 5122. Yet another method involves providing a mechanical anchoring structure 513 on both the first surface 5113 and the third surface 5122. Yet another method involves providing a mechanical anchoring structure 513 on the second surface 5121, while not providing a mechanical anchoring structure 513 on the first surface 5113 and the third surface 5122. Yet another method involves providing a mechanical anchoring structure 513 on all three surfaces. These embodiments will not list them all.

[0128] The mechanical anchoring structure 513 refers to a structure that can interlock with the insulating part 52 during installation. For example, when the mechanical anchoring structure 513 is a protrusion, the protrusion is embedded into the insulating part 52. As another example, when the mechanical anchoring structure 513 is a groove, part of the insulating part 52 is embedded into the groove during molding.

[0129] This mechanical anchoring engagement method can improve the connection stability between the insulating part 52 and the limiting flange 512, and reduce the possibility of them separating due to the rotation of the connector 5.

[0130] In some examples, optionally, the third surface 5122 is arranged circumferentially around the rod 511, and the mechanical anchoring structure 513 is arranged circumferentially along the third surface 5122.

[0131] Taking the mechanical anchoring structure 513 as a plurality of protrusions as an example, the protrusions can be triangular or polygonal, so that the entire limiting flange 512 forms a gear-like structure.

[0132] The gear-like limiting flange 512 has a plurality of protrusions, and a groove is formed between adjacent two protrusions. The insulating part 52 is embedded in the plurality of grooves, which can further improve the connection stability of the insulating part 52 and the limiting flange 512.

[0133] It can be understood that although the plurality of protrusions and the plurality of grooves are similar in structure, the processing principles and the sizes of the limiting flange 512 after forming are slightly different.

[0134] When the mechanical anchoring structure 513 is a plurality of protrusions, a circle of protrusions is formed on the periphery of the limiting flange 512 by stamping or other processes during the processing of the limiting protrusions. At this time, the radial size of the limiting flange 512 will increase. When the mechanical anchoring structure 513 of the present embodiment is a plurality of grooves, a plurality of grooves are formed on the outer surface of the original limiting flange 512 by milling or other processes. At this time, the radial size of the limiting flange 512 does not change.

[0135] In some examples, optionally, the limiting flange 512 has a fourth surface 5123 facing away from the first member 3 and connected with the third surface 5122, and the insulating part 52 wraps the fourth surface 5123.

[0136] The fourth surface 5123 is Figure 4 and 5 the upper surface of the limiting flange 512 in FIG. 4. The fourth surface 5123 is at an angle with the third surface 5122, and the fourth surface 5123 and the second surface 5121 are two opposite surfaces of the limiting flange 512 along the vertical direction in the figure.

[0137] After wrapping the fourth surface 5123 with the insulating part 52, all surfaces of the limiting flange 512 of the present embodiment are wrapped with the insulating part 52, which improves the corrosion resistance of the limiting flange 512.

[0138] In some embodiments, the limiting flange 512 can be arranged along the circumference of the rod body 511, forming a closed loop structure. The outer surface profile of the limiting flange 512 can be circular, rectangular, or other variable shapes, which is not limited in the present embodiment.

[0139] Designing the limiting flange 512 to be arranged along the circumference of the rod body 511 increases or decreases the area of the insulating part 52 wrapping the limiting flange 512, thereby increasing the limiting force area between the insulating part 52 and the first member 3. This not only has a better limiting effect, but also reduces the possibility of stress concentration between the limiting flange 512 and the insulating part 52 and the first member 3.

[0140] In combination with the accompanying drawings Figures 3-5 As shown in some examples, the body part 51 further comprises a connecting head 514 at the first end 5111, the connecting head 514 is located at the side of the limiting flange 512 away from the first member 3, and the middle part of the connecting head 514 is provided with a polygonal weight-reducing hole 5141.

[0141] The connecting head 514 is located at one end of the rod body 511 along the vertical direction in the drawing, and at the side of the limiting flange 512 away from the first member 3, specifically, the connecting head 514 is located Figure 4 and 5 the upper end of the rod body 511.

[0142] The connecting head 514 can be regarded as a part of the rod body 511, or a part independent of the rod body 511, but the connecting head 514, the limiting flange 512 and the rod body 511 are integrally formed or integrally connected.

[0143] The connecting head 514 is provided with a polygonal weight-reducing hole 5141, and the polygon can be a triangle, a rectangle, a pentagon, a hexagon, etc., which will not be enumerated one by one in this embodiment.

[0144] One of the functions of the weight-reducing hole 5141 is to connect the external screwing structure (such as an automatic screwdriver, etc.), and the external screwing structure can drive the entire rod body 511 to rotate.

[0145] Another function of the weight-reducing hole 5141 is to reduce weight, because the middle part of the connecting head 514 is hollow due to the presence of the weight-reducing hole 5141, so the weight of the entire connecting piece 5 can be reduced.

[0146] In some examples, the connecting piece 5 further comprises a locking part 53, the rod body 511 is provided with a second end 5112 adjacent to and protruding from the second member 4, and the locking part 53 is sleeved on the second end 5112 and abuts against the second member 4.

[0147] The second end 5112 is Figure 4 and 5 the lower end of the rod body 511. The locking part 53 can be a nut with internal threads (not shown in the drawing), or a plug-in locking piece (not shown in the embodiment) inserted into the lower end of the rod body 511 along the vertical direction in the drawing.

[0148] The locking part 53 is pressed against the lower surface of the second member 4 along Figure 4 and 5 and is connected to the lower end of the rod body 511.

[0149] Taking the locking portion 53 as a nut as an example, the rod body 511 is provided with external threads, the external threads of the rod body 511 are threadedly connected with the internal threads of the nut, the nut is fixed, the rod body 511 is screwed again, the insulating portion 52 on the second surface 5121 is pressed against the first component 3, and the nut is pressed against the second component 4, so that the assembly of the connecting piece 5 on the first component 3 and the second component 4 is completed.

[0150] In some examples, the locking portion 53 is threadedly connected with the second end 5112.

[0151] The locking portion 53 is provided with internal threads, and the second end 5112 is provided with external threads, which are threadedly connected, having the advantages of simple structure and easy disassembly.

[0152] Again, in combination with the accompanying Figure 4 In some examples, the insulating portion 52 extends into the second connecting hole 41 and abuts against the hole wall of the second connecting hole 41.

[0153] The insulating portion 52 extends into the second connecting hole 41, which can be along the length direction of the rod body 511, and the size of the portion of the insulating portion 52 in the second connecting hole 41 is equal to the size of the second connecting hole 41. Figure 4 In some examples, the insulating portion 52 extends into the second connecting hole 41, which can be along the length direction of the rod body 511, and the size of the portion of the insulating portion 52 in the second connecting hole 41 is less than the size of the second connecting hole 41.

[0154] Both of the two ways can make the rod body 511 not directly contact the second component 4, reducing the possibility of galvanic corrosion of the connecting piece 5 and the second component 4 due to the potential difference.

[0155] In some examples, the second component 4 and the connecting piece 5 can be made of the same material, for example, both made of carbon steel.

[0156] In some examples, an insulating layer (not shown in the figure) can be provided on the outer surface of the locking portion 53 of the embodiment, and the material of the insulating layer can be consistent with the insulating portion 52, so that the locking portion 53 does not directly contact the second component 4, thereby reducing the possibility of corrosion of the low-potential material due to the potential difference between the two.

[0157] In addition, all surfaces of the rod body 511 can be covered with an insulating layer (not shown in the figure), and the insulating layer is formed with external threads by the insulating portion 52, and the insulating portion 52 is threadedly connected with the locking portion 53.

[0158] In some examples, optionally, the first member 3 is exposed outside the battery case 10, and the potential difference between the first member 3 and the main body part 51 is greater than or equal to 0.2 volts; or the first member 3 is built inside the battery case 10, and the potential difference between the first member 3 and the main body part 51 is greater than or equal to 0.7 volts.

[0159] The first member 3 is exposed outside the battery case 10, and the first member 3 and the environment where the connecting member 5 cooperates with the first member 3 are more prone to galvanic corrosion, so when the potential difference between the first member 3 and the main body part 51 is greater than or equal to 0.2 volts, the main body part 51 can be wrapped with the insulating part 52 to reduce the possibility of galvanic corrosion.

[0160] For example, in a normal environment, when the first member 3 is exposed outside the battery case 10, and the potential difference between the first member 3 and the main body part 51 is greater than or equal to 0.35 volts, the main body part 51 can be wrapped with the insulating part 52.

[0161] The first member 3 is built inside the battery case 10, and the first member 3 and the environment where the connecting member 5 cooperates with the first member 3 are relatively stable, and the protection requirement of the potential difference between the first member 3 and the main body part 51 can be appropriately increased.

[0162] For example, in a normal environment, when the first member 3 is built inside the battery case 10, and the potential difference between the first member 3 and the main body part 51 is greater than or equal to 1 volt, the main body part 51 can be wrapped with the insulating part 52.

[0163] Based on the more complex working conditions of the first member 3 and the connecting member 5 outside the battery case 10, corrosion is more likely to occur, and the minimum potential difference of the first member 3 and the main body part 51 outside the battery case 10 is designed to be less than the minimum potential difference of the first member 3 and the connecting member 5 inside the battery case 10, to reduce the possibility of corrosion of the first member 3 and the connecting member 5.

[0164] In some examples, optionally, the second member 4 has a potential difference with the main body part 51, and the insulating part 52 is wrapped on the surface of the connecting member 5 facing the second member 4.

[0165] That is, the insulating part 52 can wrap the main body part 51, and can also wrap the locking part 53.

[0166] The embodiment utilizes the insulating part 52 wrapped on the surface of the connecting member 5 facing the second member 4 to reduce the possibility of galvanic corrosion of the one with lower potential between the main body part 51 and the second member 4 due to the existence of the potential difference.

[0167] In some examples, optionally, the main body part 51 and the insulating part 52 are integrated.

[0168] The integral piece means that the two are integrally connected by welding, hot melt connection or the like, thereby forming an integral structure.

[0169] The main body part 51 and the insulation part 52 are integral pieces, improving the structural integrity and the connection stability of the two.

[0170] In some examples, optionally, the first component 3 is at least partially a magnesium alloy piece, and the main body part 51 is a stainless steel part.

[0171] The magnesium alloy piece is a component made of an alloy with magnesium as the base and other elements (such as aluminum, zinc, manganese, etc.) added.

[0172] The magnesium alloy piece has the advantages of low density, high strength, and good heat dissipation performance, and manufacturing the battery box 10 with magnesium alloy is conducive to the lightweight of the battery box 10.

[0173] In some examples, optionally, the surface of the first component 3 is provided with a corrosion-resistant layer (not shown in the figure).

[0174] The corrosion-resistant layer can be an electroplated layer, which is a corrosion-resistant layer of a metal (such as nickel, zinc, copper, etc.) deposited on the surface of the first component 3 (such as magnesium alloy) by electrolysis principle.

[0175] Of course, in addition to the electroplated layer, the corrosion-resistant layer can also be a chemical conversion film, or an organic or inorganic insulating coating (such as a polyvinyl chloride layer), etc., which will not be enumerated too much in this embodiment.

[0176] The embodiment provides the corrosion-resistant layer on the surface of the first component 3, which can further improve the corrosion resistance of the first component 3.

[0177] In combination with the accompanying Figure 8 Fig. 2, the second aspect, the present application provides a bolt assembly, comprising a bolt and a nut in threaded connection, the bolt comprising a main body part 51 and an insulation part 52 wrapped on at least part of the outer surface of the main body part 51, the main body part 51 comprising a rod body 511 and a limiting flange 512 located at the first end 5111 of the rod body 511, and the insulation part 52 wrapping the limiting flange 512 and at least part of the rod body 511.

[0178] Among them, the bolt of the embodiment is the combination of the above-mentioned main body part 51 and the insulation part 52, and the nut is the above-mentioned locking part 53, and its structure has been introduced in the above, which will not be described here.

[0179] In combination with the accompanying Figure 1 Fig. 2 again, the present application further provides an electric device, comprising the above-mentioned battery device 100 or bolt assembly, the battery device 100 is used for providing electric energy for the electric device, and the electric device can be a vehicle 1000.

[0180] The electric device can include the bolt assembly provided in the embodiments, the bolt assembly can be arranged on the battery device 100, or can be arranged at other positions of the electric device, and is used for connecting corresponding components of the electric device. For example, the bolt assembly in the embodiments can be applied to the front axle or the rear axle of the vehicle 1000 to connect corresponding parts.

[0181] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, the present application can be implemented according to the content of the specification, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more obvious and easy to understand, the specific embodiments of the present application are described below.

[0182] The accompanying drawings are used to Figures 2-9As shown, the battery device 100 provided by the embodiments of the present application comprises a battery box 10 and a battery cell 20 installed in the battery box 10. The battery box 10 comprises a first component 3, a second component 4 and a connecting piece 5. The first component 3 is provided with a first connecting hole 31, and the first component has electrical conductivity. The second component 4 is adjacent to the first component 3 and is provided with a second connecting hole 41 which is in communication with the first connecting hole 31. The connecting piece 5 is arranged in the first connecting hole 31 and the second connecting hole 41 and connects the first component 3 and the second component 4. The connecting piece 5 comprises a main body 51 and an insulating part 52 which wraps at least part of the main body 51. The main body 51 has electrical conductivity, and there is a potential difference between the main body 51 and the first component 3. The insulating part 52 is located on the surface of the main body 51 which faces the first component 3 and abuts against the first component 3. The main body 51 comprises a rod body 511 and a limiting flange 512. The rod body 511 is arranged in the first connecting hole 31 and the second connecting hole 41 and has a first end 5111 which is adjacent to the first component 3. The limiting flange 512 is connected with the first end 5111 and protrudes from the outer circumferential surface of the rod body 511. The limiting flange 512 is located on the side of the first component 3 which is away from the second component 4. The surface of the limiting flange 512 comprises a first surface 5113 and a second surface 5121. The first surface is the outer circumferential surface of the rod body 511 which is located in the first connecting hole 31. The second surface is the surface of the limiting flange 512 which faces the first component 3. The insulating part 52 wraps the first surface 5113 and the second surface 5121. The limiting flange 512 is provided with the second surface 5121 which faces the first component 3. The insulating part 52 wraps the first surface 5113 and the second surface 5121. The limiting flange 512 has a third surface 5122 which is connected with the second surface 5121 and forms an angle. The insulating part 52 wraps the third surface 5122. The third surface 5122 is provided with a mechanical anchoring structure 513 which is a protrusion or a groove. The insulating part 52 is connected with the mechanical anchoring structure 513 in a fitting mode. The third surface 5122 is arranged along the circumference of the rod body 511. The mechanical anchoring structure 513 is arranged along the circumference of the third surface 5122. The limiting flange 512 has a fourth surface 5123 which is away from the first component 3 and connected with the third surface 5122. The insulating part 52 wraps the fourth surface 5123. The main body 51 further comprises a connecting head 514 which is located at the first end 5111. The connecting head 514 is located on the side of the limiting flange 512 which is away from the first component 3. The middle part of the connecting head 514 is provided with a polygonal weight-reducing hole 5141. The connecting piece 5 further comprises a locking part 53. The rod body 511 is provided with a second end 5112 which is adjacent to the second component 4 and protrudes from the second component 4. The locking part 53 is sleeved on the second end 5112 and abuts against the second component 4. The locking part 53 is threadedly connected with the second end 5112. The insulating part 52 is located on the part of the rod body 511 which extends into the second connecting hole 41 and abuts against the hole wall of the second connecting hole 41. The first component 3 is a magnesium alloy part. The main body 51 is a stainless steel part. The surface of the first component 3 is provided with a corrosion-resistant layer.

[0183] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or the intermediate technical features can be replaced by equivalent ones, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery device comprising a battery case and a battery cell mounted in the battery case, characterized by, The battery case comprises: a first member provided with a first connecting hole, the first member having electrical conductivity; a second member adjacent to the first member and provided with a second connecting hole through which the first connecting hole passes; and a connecting piece penetrating the first connecting hole and the second connecting hole and connecting the first member and the second member, the connecting piece comprising a main body part and an insulating part wrapping at least part of the main body part, the main body part having electrical conductivity and having a potential difference with the first member, the insulating part wrapping a surface of the main body part facing the first member and abutting against the first member.

2. The battery device according to claim 1, characterized by The main body part comprises a rod body and a limiting flange, the rod body penetrating the first connecting hole and the second connecting hole and having a first end, the limiting flange being connected with the first end and protruding from an outer circumferential surface of the rod body, the limiting flange being located on a side of the first member away from the second member, the surface comprising a first surface and a second surface, the first surface being an outer circumferential surface of the rod body located in the first connecting hole, the second surface being a surface of the limiting flange facing the first member, the insulating part wrapping the first surface and the second surface.

3. The battery device of claim 2, wherein, The limiting flange has a third surface in contact with the second surface and forming an angle, and the insulating part wraps the third surface.

4. The battery device of claim 3, wherein At least one of the first surface, the second surface and the third surface is provided with a mechanical anchoring structure, the mechanical anchoring structure being a protrusion or a groove, and the insulating part is in embedded connection with the mechanical anchoring structure.

5. The battery device of claim 4, wherein, The third surface is circumferentially arranged around the rod body, and the mechanical anchoring structure is circumferentially arranged along the third surface.

6. The battery device of claim 3, wherein The limiting flange has a fourth surface away from the first member and in contact with the third surface, and the insulating part wraps the fourth surface.

7. The battery device of claim 2, wherein The main body part further comprises a connecting head at the first end, the connecting head being located on a side of the limiting flange away from the first member, and a polygonal weight-reducing hole is arranged in a middle part of the connecting head.

8. The battery device according to any one of claims 2 to 7, wherein The connecting piece further comprises a locking part, the rod body is provided with a second end adjacent to the second member and protruding from the second member, and the locking part is sleeved on the second end and abuts against the second member.

9. The battery device of claim 8, wherein, The locking part is in threaded connection with the second end.

10. The battery device according to any one of claims 2 to 7, wherein Part of the insulating part extending to the second connecting hole abuts against a hole wall of the second connecting hole.

11. The battery device according to any one of claims 1 to 7, wherein The first member is exposed to an outside of the battery case, and a potential difference between the first member and the main body part is greater than or equal to 0.2 volts. Alternatively, the first member is built into an inside of the battery case, and a potential difference between the first member and the main body part is greater than or equal to 0.7 volts.

12. The battery device according to any one of claims 1 to 7, wherein The second member and the main body part have a potential difference, and the insulating part is wrapped on a surface of the connecting piece facing the second member.

13. The battery device according to any one of claims 1 to 7, wherein The main body part and the insulating part are an integral piece.

14. The battery device according to any one of claims 1 to 7, wherein The first member is a magnesium alloy piece, and the main body part is a stainless steel part.

15. The battery device according to any one of claims 1 to 7, wherein A surface of the first member is provided with an anti-corrosion layer.

16. A bolt assembly characterized in that, A bolt and nut assembly including a threaded bolt and a nut, the bolt including a body portion and an insulating portion overlying at least a portion of an outer surface of the body portion, the body portion including a shank and a stop flange at a first end of the shank, the insulating portion overlying at least a portion of the stop flange and at least a portion of the shank.

17. An electrical device, characterized by A battery device as claimed in any one of claims 1 to 15 or a bolt assembly as claimed in claim 16.

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