Battery device and electric device

Abstract

The utility model discloses a battery device and an electric device. The battery device comprises a first structural member, a second structural member and a fastening assembly, and the first structural member and the second structural member are connected through the fastening assembly; the fastening assembly comprises a fastening piece, a spacer and a blocking piece, the fastening piece comprises a fastening rod and a fastening flange arranged on the periphery of the fastening rod, the fastening rod penetrates through the first structural part and the second structural part, the spacer is arranged between the fastening flange and the first structural part, a groove is formed in the side, facing the first structural part, of the spacer, and the blocking piece is arranged in the groove. The blocking piece is located in the groove and connected with the fastening rod in a clamped mode. The reliability of the battery device can be improved.

Description

Technical Field

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

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have been increasingly widely used and are gradually replacing traditional fuel vehicles, becoming one of the mainstream modes of transportation. As the power source of new energy vehicles, the power battery is one of their core components; therefore, the safety performance of the power battery has become a key focus of attention.

[0003] In the development of battery technology, improving the reliability of battery devices is a key research direction. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, which includes a first structural member, a second structural member, and a fastening assembly. The first structural member and the second structural member are connected by the fastening assembly. The fastening assembly includes a fastener, a spacer, and a blocking member. The fastener includes a fastening rod and a fastening flange disposed on the outer periphery of the fastening rod. The fastening rod passes through the first structural member and the second structural member respectively. The spacer is disposed between the fastening flange and the first structural member. The side of the spacer facing the first structural member has a groove. The blocking member is located in the groove and engages with the fastening rod.

[0006] In the above scheme, the first and second structural components are connected by fasteners. A spacer is placed between the fastening flange and the first structural component to reduce the friction between the fastener and the first structural component when the fastener is rotated, thereby reducing damage to the electrophoretic layer on the surface of the first structural component and improving its corrosion resistance. By providing a groove on the side of the spacer facing the first structural component and placing a blocking element within the groove, which engages with the fastening rod, not only is the sealing between the spacer and the first structural component ensured to a certain extent, further preventing the infiltration of moisture and corrosive media and protecting the internal battery cells, but the assembly of the spacer and fastener via the blocking element also avoids damage to the electroplated layer on the fastener surface caused by the riveting process, thereby improving the corrosion resistance of the fastener and enhancing the reliability of the battery device.

[0007] In some embodiments, the battery device further includes a housing structure and a plurality of battery cells. The housing structure includes a first housing and a second housing, the first structural member being the first housing and the second structural member being the second housing. The first housing and the second housing are joined together to form a receiving cavity, and the plurality of battery cells are disposed in the receiving cavity.

[0008] In the above scheme, by using the first box as the first structural component and the second box as the second structural component, the corrosion resistance of the box structure can be improved.

[0009] In some embodiments, the blocking member includes a retaining ring portion and a plurality of retaining teeth portions. The retaining ring portion is arranged around the fastening rod in a circumferential manner, and the plurality of retaining teeth portions are arranged on the side of the retaining ring portion facing the fastening rod, and the retaining teeth portions engage with the fastening rod.

[0010] In the above solution, the retaining ring and multiple locking teeth work together to more evenly and securely engage the fastening rod, thereby improving the stability of the spacer during assembly.

[0011] In some embodiments, the retaining ring portion is inclined toward the direction of the fastening rod, and the retaining tooth portion is inclined toward the direction of the second structural member.

[0012] In the above solution, by setting the locking teeth to be inclined toward the second structural member, the blocking member can be more easily slid into place during installation, and can form a more effective lock when subjected to a reverse force, thereby preventing the blocking member from loosening to a certain extent.

[0013] In some embodiments, the locking tooth portion includes a first locking tooth segment and a second locking tooth segment. The first locking tooth segment is connected to the retaining ring portion, and the second locking tooth segment is disposed on the side of the first locking tooth segment facing the fastening rod. At least a portion of the first locking tooth segment includes a first inclined surface, and the second locking tooth segment includes a second inclined surface. Along the direction from the retaining ring portion to the fastening rod, the first inclined surface and the second inclined surface are inclined toward the direction of the second structural member, and the inclination angle of the second inclined surface relative to the plane where the retaining ring portion is located is greater than the inclination angle of the first inclined surface relative to the plane where the retaining ring portion is located.

[0014] In the above solution, by setting the inclination angle of the second inclined surface of the second tooth section to be larger, the tooth part can slide into the fastener more easily, reducing assembly resistance; and after installation, the reverse pull-out force required for the blocking part is greater, thereby improving the reliability of the blocking part in preventing loosening while achieving convenient assembly.

[0015] In some embodiments, the retaining tooth portion includes a first side and a second side disposed opposite to each other, the first side abutting against the fastening rod, the second side being connected to the retaining ring portion, and the thickness of the first side being less than the thickness of the second side.

[0016] In the above solution, by setting the thickness of the first side in contact with the fastening rod to be smaller, the friction area between the locking teeth and the fastening rod can be reduced, thereby reducing the damage to the electroplated layer on the surface of the fastening rod and further improving the corrosion resistance of the fastener.

[0017] In some embodiments, the groove includes a top wall and a side wall disposed on the outer periphery of the top wall, the top wall being spaced apart from the first structural member; and a gap is formed between the blocking member and the side wall.

[0018] In the above solution, by setting a gap between the blocking component and the side panel, it is easier to push the blocking component into the groove when installing it, thus reducing interference.

[0019] In some embodiments, the groove includes a top wall and a side wall disposed on the outer periphery of the top wall, with the top wall and the first housing spaced apart; the blocking member and the side wall are interference fit.

[0020] In the above solution, by using an interference fit between the blocking component and the side panel, the stability of the spacer component can be increased, and the spacer component can be prevented from loosening to a certain extent.

[0021] In some embodiments, the potential difference of the spacer is less than the potential difference of the fastener.

[0022] In the above scheme, by setting the potential difference of the spacer to be less than that of the fastener, the corrosion of the spacer can be sacrificed first, thereby further improving the corrosion resistance of the fastener.

[0023] In some embodiments, the potential difference between the spacer and the fastener is greater than or equal to 0.5V.

[0024] In the above scheme, by limiting the potential difference between the spacer and the fastener to no less than 0.5V, the spacer is more susceptible to corrosion than the fastener, thereby ensuring to a certain extent that the fastener will not be corroded.

[0025] In some embodiments, the potential difference between the spacer and the fastener is less than or equal to 1V.

[0026] In the above solution, by limiting the potential difference between the spacer and the fastener to no more than 1V, the corrosion rate of the sacrificial spacer can be controlled within a reasonable range. This ensures effective protection for the fastener to a certain extent while preventing the spacer from failing prematurely due to excessive corrosion, thus achieving long-term and stable corrosion resistance of the entire fastening assembly.

[0027] In some embodiments, the orthographic projection of the fastening flange onto the first structural member lies within the orthographic projection of the spacer onto the first structural member.

[0028] In the above scheme, by setting the orthographic projection of the fastening flange on the first structural member to be located within the orthographic projection of the septum on the first structural member, a sufficiently large contact area can be provided between the septum and the first structural member. This can prevent the septum from rotating when the fastener is rotated, thereby further reducing the friction between the septum and the first structural member and further reducing the risk of damage to the electrophoretic layer on the surface of the first structural member.

[0029] In some embodiments, the yield strength of the spacer is less than or equal to 280 MPa.

[0030] In the above solution, by setting the yield strength of the septum to less than or equal to 280MPa, the electrophoretic layer on the surface of the first housing can be further protected from damage, the bubbling problem can be improved, and the sealing function of the sealing interface between the septum and the first housing can be further strengthened, thus improving the phenomenon of fastener corrosion caused by water seepage.

[0031] In some embodiments, the yield strength of the spacer is greater than or equal to 250 MPa.

[0032] In the above scheme, by limiting the yield strength of the diaphragm to no less than 250MPa, it is ensured to a certain extent that the diaphragm has sufficient structural strength and rigidity when subjected to fastener locking force.

[0033] In some embodiments, the spacer and the fastening rod are spaced apart.

[0034] In the above solution, by setting a gap between the spacer and the fastening rod, it is possible to facilitate the assembly between the spacer and the fastener, and also to protect the surface of the fastening rod and reduce the risk of the fastening rod surface being scratched.

[0035] In some embodiments, the distance between the spacer and the fastening rod is greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

[0036] In the above solution, by limiting the distance between the spacer and the fastening rod to a suitable range, it is possible to facilitate the assembly between the spacer and the fastener, protect the surface of the fastening rod, and improve the stability of the spacer after it is assembled to the fastener.

[0037] In some embodiments, the fastening flange includes a flange contact surface that abuts against a spacer; the outer surface of the fastener is provided with an electroplated layer, the thickness of the electroplated layer on the flange contact surface being equal to the thickness of the electroplated layer on the remaining surfaces of the fastener.

[0038] In the above solution, by setting the thickness of the electroplated layer on the flange contact surface to be equal to the thickness of the electroplated layer on the other surfaces of the fastener, the uniformity of the electroplated layer thickness on the entire surface of the fastener can be guaranteed to a certain extent, thereby making the entire surface of the fastener less susceptible to corrosion.

[0039] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery device, which is used to provide electrical energy.

[0040] The electrical device provided in this application embodiment has the same technical effect as the battery provided in the above embodiment, and will not be described again here. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

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

[0043] Figure 2 Exploded views of battery devices according to some embodiments of this application;

[0044] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application;

[0045] Figure 4 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0046] Figure 5 This is an assembly diagram of the fastening components and the first and second housings according to some embodiments of this application;

[0047] Figure 6 This is a schematic diagram of the structure of a fastening assembly according to some embodiments of this application;

[0048] Figure 7 This is a front view of a blocking element according to some embodiments of this application;

[0049] Figure 8 This is a side view of a blocking element according to some embodiments of this application;

[0050] Figure 9 yes Figure 5 Enlarged schematic diagram of part A;

[0051] Figure 10 This is a partial schematic diagram of a fastening assembly according to some embodiments of this application;

[0052] Figure 11 This is a partial schematic diagram of a fastening assembly according to other embodiments of this application;

[0053] Figure 12 This is a schematic diagram of the structure of fasteners according to some embodiments of this application.

[0054] Explanation of reference numerals in the attached figures:

[0055] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 10, First Housing; 30, Second Housing; 400, Battery Module; 20, Battery Cell; 21, End Cap; 22, Housing; 23, Electrode Assembly; 26, Electrode Terminal; 40, Fastening Assembly; 41, Fastener; 411, Fastening Rod; 412, Fastening Flange; 413, Flange Contact Surface; 414, Electroplating Layer; 42, Spacer; 421, Groove; 422, Top Wall; 423, Side Wall; 43, Blocking Member; 431, Retaining Ring; 432, Clamping Tooth; 433, First Clamping Tooth Section; 434, Second Clamping Tooth Section; 435, First Inclined Surface; 436, Second Inclined Surface; 437, First Side; 438, Second Side; 50, Tightening Member; 60, First Structural Component; 70, Second Structural Component. Detailed Implementation

[0056] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0058] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0059] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0060] In this application, "multiple" means two or more (including two).

[0061] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0062] The battery mentioned in the embodiments of this application may be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0063] In some embodiments, the battery can be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0064] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0065] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0066] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0067] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0068] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0069] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0070] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel with a silver surface treatment, copper, aluminum, nickel, carbon electrodes, carbon, or titanium can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0072] In some embodiments, the positive electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0073] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0074] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-surfaced stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0076] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0077] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0078] In some embodiments, the negative electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0079] As an example, lithium source material, potassium metal or sodium metal may also be filled or deposited in the negative electrode current collector, wherein the lithium source material is lithium metal and / or lithium-rich material.

[0080] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0081] In some embodiments, the electrode assembly further includes a separator disposed between the positive and negative electrodes. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0082] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0083] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0084] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0085] In some implementations, the electrode assembly is a stacked structure.

[0086] Multiple positive and negative electrodes can be set separately, and multiple positive and multiple negative electrodes can be stacked alternately.

[0087] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0088] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0089] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0090] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0091] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0092] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] As the market share of electric vehicles grows year by year, the overall vehicle corrosion resistance has always been one of the core competitive advantages of electric vehicles. Currently, the battery pack housing or high-voltage box is connected by fasteners. The fasteners and gaskets are then riveted together and electroplated, or the fasteners are electroplated and then the gaskets are riveted on. This results in uneven or damaged electroplating at the contact points between the fasteners and the gaskets, making the structure in these areas susceptible to corrosion, thereby reducing the reliability of the battery pack.

[0094] To address the aforementioned technical problems, this application provides a battery device that connects a first structural component and a second structural component using fasteners. A spacer is provided between the fastening flange and the first structural component to reduce the frictional force between the fastener and the first structural component during fastening, thereby reducing damage to the electrophoretic layer on the surface of the first structural component and improving its corrosion resistance. By providing a groove on the side of the spacer facing the first structural component and placing a blocking member within the groove, which engages with the fastening rod, not only is the sealing between the spacer and the first structural component ensured to a certain extent, further preventing the infiltration of moisture and corrosive media and protecting the internal battery cells, but the assembly of the spacer and fastener via the blocking member also avoids damage to the electroplated layer on the fastener surface caused by the riveting process, thereby improving the corrosion resistance of the fastener and enhancing the reliability of the battery device.

[0095] The technical solutions described in the embodiments of this application are applicable to electrode assemblies, battery cells including electrode elements, batteries including battery cells, and electrical devices using batteries.

[0096] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0097] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0098] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0099] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0100] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device provided in some embodiments of this application. The battery device 100 includes a housing structure and a battery cell 20. In some embodiments, the housing structure may include a first housing 10 and a second housing 30, which overlap each other, and together define a receiving cavity for accommodating the battery cell 20. The second housing 30 may be a hollow structure with one open end, and the first housing 10 may be a plate-like structure, with the first housing 10 covering the open side of the second housing 30 so that the first housing 10 and the second housing 30 together define the receiving cavity; alternatively, the first housing 10 and the second housing 30 may both be hollow structures with one open side, with the open side of the first housing 10 covering the open side of the second housing 30. Of course, the battery housing formed by the first housing 10 and the second housing 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0101] Figure 3 This is a schematic diagram of the structure of a battery module 400 according to some embodiments of this application. In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed in a casing. Alternatively, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed configuration to form a battery module 400, and then connecting multiple battery modules 400 in series, parallel, or in a mixed configuration to form a whole, which is then housed in a casing. The battery device 100 may also include other structures; for example, the battery device 100 may also include a busbar component for realizing electrical connections between multiple battery cells 20.

[0102] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0103] Figure 4This is an exploded structural diagram of a battery cell according to some embodiments of this application. The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit it. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is less prone to deformation under pressure and impact, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 26 can be provided on the end cap 21. The electrode terminals 26 can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief component for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0104] Figure 5 This is an assembly diagram of the fastening components with the first structural member and the second structural member according to some embodiments of this application; Figure 6 This is a schematic diagram of the structure of a fastening component according to some embodiments of this application.

[0105] Please refer to the following: Figure 5 and Figure 6 In a first aspect, embodiments of this application provide a battery device 100, which includes a first structural member 60, a second structural member 70, and a fastening assembly 40. The first structural member 60 and the second structural member 70 are connected by the fastening assembly 40. The fastening assembly 40 includes a fastener 41, a spacer 42, and a blocking member 43. The fastener 41 includes a fastening rod 411 and a fastening flange 412 disposed on the outer periphery of the fastening rod 411. The fastening rod 411 passes through the first structural member 60 and the second structural member 70 respectively. The spacer 42 is disposed between the fastening flange 412 and the first structural member 60. The spacer 42 has a groove 421 on the side facing the first structural member 60. The blocking member 43 is located in the groove 421 and is engaged with the fastening rod 411.

[0106] The first structural component 60 can be a first housing 10 of a housing structure for accommodating the battery cell 20, and the second structural component 70 can be a second housing 30 of the housing structure. Alternatively, the first structural component 60 and the second structural component 70 can each be a housing of a high-voltage box. Alternatively, the first structural component 60 can be one of a high-voltage box or a housing structure, and the second structural component 70 can be the other of a high-voltage box or a housing structure. Alternatively, the first structural component 60 and the second structural component 70 can each be a structural component in a high-voltage box, such as an electrical connector or an electronic component. Alternatively, the first structural component 60 can be one of a maintenance panel or a housing structure, and the second structural component 70 can be the other of a maintenance panel or a housing structure. The first structural component 60 and the second structural component 70 can be plate-like structures, sheet-like structures, or layered structures. The shape, thickness, material, etc., of the structural components in this application embodiment are not limited, as long as they can be locked and connected by fastening assembly 40. The first structural component 60 and the second structural component 70 can be made of metal materials, such as aluminum alloy or steel, and their surfaces are often treated with anti-corrosion treatment such as electrophoretic coating.

[0107] Fastener 41 can be a bolt, including a fastening rod 411 (i.e., a threaded portion) and a fastening flange 412 (i.e., a bolt head or flange face) located at one end of the fastening rod 411. The fastening rod 411 passes sequentially through corresponding mounting holes on the first structural member 60 and the second structural member 70. The fastening assembly 40 may also include a tightening member 50, which can be a bolt, nut, etc. After passing through the first structural member 60 and the second structural member 70, the fastening rod 411 is finally locked with the tightening member 50, thereby fixing the two first structural members 60 and the second structural member 70 together. The base material of the fastener 41 can be carbon steel, and its outer surface is provided with an electroplated layer 414 (such as a zinc-nickel alloy plating) to provide basic corrosion protection.

[0108] A spacer 42 is disposed between the fastening flange 412 and the first structural member 60. The spacer 42 can be an annular gasket. As an intermediate layer, the spacer 42 can, to a certain extent, prevent the fastening flange 412 from directly rubbing against and scratching the electrophoretic coating on the surface of the first structural member 60 during rotation and tightening. A groove 421 is machined on the side of the spacer 42 facing the first structural member 60. This groove 421 provides a space for the subsequent blocking member 43. After assembly, the blocking member 43 can be flush with the spacer 42, which reduces the risk of interference between the blocking member 43 and other structural members, and enhances the overall structural stability and assembly compactness of the fastening assembly 40. Alternatively, the blocking member 43 can also be partially located within the groove 421. The blocking member 43 is located within the groove 421 of the spacer 42 and engages with the fastening rod 411, thereby pre-fixing the spacer 42 onto the fastening rod 411 before final tightening, forming a flowable assembly. The blocking component 43 may include an elastic structure, or the blocking component 43 may be made of elastic materials such as rubber, silicone, or plastic, so as to facilitate the assembly of the blocking component 43 and facilitate the fixing and anti-loosening of the blocking component 43 after assembly. The spacer 42 deforms under tightening pressure and fits tightly against the surface of the first structural component 60. At the same time, the blocking component 43 fills the groove 421, which together enhances the sealing of the connection interface and can block the intrusion of water vapor and corrosive media to a certain extent.

[0109] During assembly, the spacer 42 can be first fitted onto the fastening rod 411, then the blocking member 43 can be pressed into the groove 421 on the back of the spacer 42 and secured to the fastening rod 411, thus reliably pre-fixing the spacer 42 onto the fastener 41. Finally, the fastening rod 411 is passed through the first structural member 60 and the second structural member 70 and tightened in conjunction with the tightening member 50. Alternatively, the blocking member 43 can be first fitted into the groove 421 of the spacer 42, and then the blocking member 43 and the spacer 42 can be fitted onto the fastening rod 411 as a whole. The fastener 41 can be electroplated first, and then the spacer 42 can be assembled. That is, the fastener 41 is first electroplated with high quality, and then the spacer 42 is assembled by a non-destructive elastic snap-fit ​​method, which to a certain extent avoids the problems of uneven electroplating layer 414 of the fastener 41 caused by the gasket obstruction in the traditional process, or the damage to the electroplating layer 414 caused by the riveting process.

[0110] In the above scheme, the first structural component 60 and the second structural component 70 are connected by fasteners 41. A spacer 42 is provided between the fastening flange 412 and the first structural component 60. This reduces the frictional force of the fastener 41 on the first structural component 60 when the fastener 41 is rotated, thereby reducing damage to the electrophoretic layer on the surface of the first structural component 60 and improving its corrosion resistance. A groove 421 is provided on the side of the spacer 42 facing the first structural component 60, and a blocking member 43 is provided within the groove 421. The blocking member 43 engages with the fastening rod 411, which not only ensures the sealing between the spacer 42 and the first structural component 60 to a certain extent, further preventing the infiltration of moisture and corrosive media and protecting the internal battery cells 20, but also, through the assembly of the spacer 42 and the fastener 41 by the blocking member 43, avoids damage to the electroplated layer 414 on the surface of the fastener 41 to a certain extent during the riveting process, thereby improving the corrosion resistance of the fastener 41 and enhancing the reliability of the battery device 100.

[0111] In some embodiments, the battery device 100 further includes a housing structure and a plurality of battery cells 20. The housing structure includes a first housing 10 and a second housing 30. A first structural member 60 is the first housing 10, and a second structural member 70 is the second housing 30. The first housing 10 and the second housing 30 are assembled together to form a receiving cavity, and the plurality of battery cells 20 are disposed in the receiving cavity.

[0112] The housing structure is used to house and protect the internal battery cells 20. It is formed by connecting and assembling a first structural member 60 and a second structural member 70 through a fastening assembly 40, together defining a sealed accommodating cavity. The first structural member 60 can be a top cover, and the second structural member 70 can be a housing with an opening at the bottom, or vice versa.

[0113] In the above scheme, by using the first box 10 as the first structural component 60 and the second box 30 as the second structural component 70, the corrosion resistance of the box structure can be improved.

[0114] Figure 7 This is a front view of a blocking element according to some embodiments of this application.

[0115] like Figure 7 As shown, in some embodiments, the blocking member 43 includes a retaining ring portion 431 and a plurality of retaining teeth portions 432. The retaining ring portion 431 is arranged around the fastening rod 411 in a circumferential manner, and the plurality of retaining teeth portions 432 are arranged on the side of the retaining ring portion 431 facing the fastening rod 411, and the retaining teeth portions 432 engage with the fastening rod 411.

[0116] The retaining ring portion 431 can be an annular body with a central through hole, the inner diameter of which is larger than the diameter of the fastening rod 411. Multiple retaining teeth 432 can extend or protrude from the inner edge of the retaining ring portion 431 toward the fastening rod 411, and are evenly or unevenly distributed circumferentially. Each retaining tooth 432 is elastic, and its inner side is designed with a toothed or protruding structure, such that when the retaining tooth 432 is in a free state, the diameter of the inscribed circle formed by its innermost point is smaller than the outer diameter of the fastening rod 411. When the blocking member 43 is pushed toward the fastening rod 411 by an axial force, the inner side of the locking tooth 432 contacts the surface of the fastening rod 411. Under the action of the contact force, the locking tooth 432 undergoes elastic deformation outward (radially), thereby temporarily expanding the diameter of the inscribed circle, allowing the retaining ring 431 to smoothly slide over the smooth rod area of ​​the fastening rod 411. Once it reaches the groove 421, it stops sliding, and its elastic restoring force will drive the locking tooth 432 to spring back inward, so that the locking tooth 432 on its inner side is tightly engaged with the surface of the fastening rod 411, thereby achieving locking and fixing.

[0117] In the above solution, the retaining ring part 431 and multiple locking teeth part 432 cooperate to more evenly and firmly lock the fastening rod 411, thereby improving the stability of the spacer part 42 during assembly.

[0118] Figure 8 This is a side view of a blocking element according to some embodiments of this application.

[0119] like Figure 8 As shown, in some embodiments, along the direction from the retaining ring portion 431 to the fastening rod 411, the retaining tooth portion 432 is inclined toward the direction of the second structural member 70.

[0120] Each retaining tooth 432 does not extend perpendicularly to the plane of the retaining ring 431. Instead, its entirety or key force-bearing portion forms an acute angle with the plane of the retaining ring 431, pointing towards the second structural member 70, thus forming a guide surface. When the blocking member 43 is pushed along the installation direction (i.e., towards the spacer 42 and the first structural member 60), the outer peripheral surface of the fastening rod 411 applies a force to the inclined retaining tooth 432. This force can be decomposed into axial and radial components. The radial component drives the retaining tooth 432 to elastically expand outward, thereby reducing the axial thrust required to fit the blocking member 43 into the fastening rod 411, making the assembly process smoother and less strenuous. Conversely, after assembly, if the blocking member 43 is subjected to a tendency to move away from the spacer member 42 (i.e., the direction of detachment), the contact point and interaction force direction between the fastening rod 411 and the inner side of the locking tooth 432 change. At this time, the radial component force generated by the inclined surface changes to drive the locking tooth 432 to tighten inward, thereby increasing the biting force and frictional resistance between it and the fastening rod 411, forming an effective mechanical lock and improving the reliability of preventing accidental loosening.

[0121] In the above solution, by setting the locking tooth 432 to be inclined toward the second structural member 70, the blocking member 43 is easier to slide into place during installation, and can form a more effective lock when subjected to a reverse force, thereby preventing the blocking member 43 from loosening to a certain extent.

[0122] Figure 9 yes Figure 5 Enlarged schematic diagram of part A.

[0123] like Figure 9 As shown, in some embodiments, the locking tooth portion 432 includes a first locking tooth segment 433 and a second locking tooth segment 434. The first locking tooth segment 433 is connected to the retaining ring portion 431, and the second locking tooth segment 434 is disposed on the side of the first locking tooth segment 433 facing the fastening rod 411. At least a portion of the first locking tooth segment 433 includes a first inclined surface 435, and the second locking tooth segment 434 includes a second inclined surface 436. Along the direction from the retaining ring portion 431 to the fastening rod 411, the first inclined surface 435 and the second inclined surface 436 are inclined toward the direction of the second structural member 70, and the inclination angle α2 of the second inclined surface 436 relative to the plane where the retaining ring portion 431 is located is greater than the inclination angle α1 of the first inclined surface 435 relative to the plane where the retaining ring portion 431 is located.

[0124] The side of the first toothed section 433 facing the first structural member 60 can be entirely the first inclined surface 435, or partially the first inclined surface 435, with the remaining portion being a plane. The inclination angle α1 of the first inclined surface 435 is the inclination angle relative to the retaining ring portion 431, and the inclination angle α2 of the second inclined surface 436 is the inclination angle relative to the retaining ring portion 431.

[0125] The first locking section 433 serves as a connection and transition area, and its first inclined surface 435 is designed to be relatively gentle (i.e., with a small inclination angle), mainly serving a guiding function. The second locking section 434 serves as the final locking area, and its second inclined surface 436 is designed to be steeper (i.e., with a larger inclination angle).

[0126] In the above scheme, by setting the inclination angle of the second inclined surface 436 of the second tooth section 434 to be larger, the tooth part 432 can slide into the fastener 41 more easily, reducing assembly resistance; and after installation, the reverse disengagement force required for the blocking member 43 is greater, thereby improving the reliability of the blocking member 43 in preventing loosening while achieving convenient assembly.

[0127] In some embodiments, the retaining tooth portion 432 includes a first side 437 and a second side 438 disposed opposite to each other. The first side 437 abuts against the fastening rod 411, and the second side 438 is connected to the retaining ring portion 431. The thickness H1 of the first side 437 is less than the thickness H2 of the second side 438.

[0128] The locking teeth 432 can be partially or entirely designed as a wedge-shaped or similar structure with a gradually varying thickness in the radial direction. The first side 437 (inner side) of the locking teeth 432, which directly contacts the fastening rod 411 and generates relative movement, is intentionally thinned to form a sharper or narrower contact edge; while the second side 438 (outer side / root side), which is closer to the retaining ring 431 and mainly undertakes structural support and elastic deformation functions, maintains a larger thickness to ensure sufficient mechanical strength and resilience. On the one hand, the thinned first side 437 significantly reduces its actual contact area with the coating on the surface of the fastening rod 411. Under the same clamping force, the reduction in contact area directly reduces the total friction and the resulting microscopic scratches and wear. On the other hand, the thick second side 438 makes the locking teeth 432 less prone to breakage or plastic deformation failure during repeated elastic deformation, thus ensuring reliability for long-term use to a certain extent.

[0129] In the above solution, by setting the thickness H1 of the first side 437 that contacts the fastening rod 411 to be smaller, the friction area between the locking tooth 432 and the fastening rod 411 can be reduced, thereby reducing the damage to the electroplated layer 414 on the surface of the fastening rod 411 and further improving the corrosion resistance of the fastener 41.

[0130] Figure 10 This is a partial schematic diagram of a fastening assembly according to some embodiments of this application.

[0131] like Figure 10 As shown, in some embodiments, the groove 421 includes a top wall 422 and a side wall 423 disposed on the outer periphery of the top wall 422, the top wall 422 and the first structural member 60 are spaced apart; the blocking member 43 and the side wall 423 have a gap.

[0132] The blocking member 43 contacts the top wall 422 of the groove 421 to support the spacer member 42. During assembly, the spacer member 42 can be first placed on the fastening rod 411, and then the blocking member 43 can be pushed into the groove 421. The outer diameter of the blocking member 43 (retaining ring portion 431) is designed to be slightly smaller than the inner diameter of the side wall 423 of the groove 421, thereby forming an annular gap between the two radially.

[0133] In the above solution, by setting a gap between the blocking member 43 and the side wall 423, it is easier to push the blocking member 43 into the groove 421 when installing the blocking member 43, thus reducing interference.

[0134] Figure 11 This is a partial schematic diagram of a fastening assembly according to other embodiments of this application.

[0135] like Figure 11As shown, in some embodiments, the groove 421 includes a top wall 422 and a side wall 423 disposed on the outer periphery of the top wall 422, the top wall 422 and the first structural member 60 are spaced apart; the blocking member 43 and the side wall 423 are interference fit.

[0136] The outer diameter of the blocking member 43 (retaining ring portion 431) is designed to be slightly larger than the inner diameter of the side wall 423 of the groove 421. During assembly, the blocking member 43 can be first inserted into the groove 421 of the spacer member 42 through an interference fit, and then the blocking member 43 and the spacer member 42 are fitted onto the fastening rod 411 as a whole. The interference fit between the blocking member 43 and the side wall 423 generates a continuous radial compressive stress between the blocking member 43 and the spacer member 42, forming static friction, which resists the possible circumferential rotation or radial movement of the blocking member 43 within the groove 421.

[0137] In the above solution, by interfering with the blocking member 43 and the side wall 423, the stability of the spacer member 42 can be increased, and the spacer member 42 can be prevented from loosening to a certain extent.

[0138] In some embodiments, the potential difference of the spacer 42 is less than the potential difference of the fastener 41.

[0139] The spacer 42 can be made of a material with a lower potential than the fastener 41, such as an aluminum alloy. This allows the spacer 42, with its more negative potential, to act as a sacrificial anode and be preferentially corroded when the spacer 42 and the fastener 41 form a galvanic couple in an electrolyte (such as a humid environment), thereby providing cathodic protection to the fastener 41 (cathode) and enhancing the corrosion resistance of the fastener 41.

[0140] For example, the septum 42 can be made of a material with a more negative electrode potential (i.e., more chemically reactive) (e.g., aluminum alloy), while the fastener 41 can be made of a material with a relatively more positive potential (i.e., more chemically stable) (e.g., carbon steel plated with zinc and nickel). This allows the two to spontaneously form a galvanic cell when in contact and exposed to the electrolyte. In this electrochemical system, the more negatively potentialed septum 42 acts as the anode, undergoing oxidation and preferentially corroded and dissolved; the more positively potentialed fastener 41 acts as the cathode, undergoing reduction and protected, with its metal body experiencing almost no corrosion. This sacrificial anode protection mechanism based on potential difference provides active and continuous protection for the fastener 41.

[0141] In the above scheme, by setting the potential difference of the spacer 42 to be less than the potential difference of the fastener 41, the corrosion of the spacer 42 can be sacrificed first, thereby further improving the corrosion resistance of the fastener 41.

[0142] In some embodiments, the potential difference between the spacer 42 and the fastener 41 is greater than or equal to 0.5V.

[0143] The potential difference between the spacer 42 and the fastener 41 can be 0.5V, 0.55V, 0.6V, 0.65V, 0.7V, 0.75V, etc.

[0144] In the above scheme, by limiting the potential difference between the spacer 42 and the fastener 41 to not less than 0.5V, the spacer 42 is more susceptible to corrosion than the fastener 41, thereby ensuring to a certain extent that the fastener 41 will not be corroded.

[0145] In some embodiments, the potential difference between the spacer 42 and the fastener 41 is less than or equal to 1V.

[0146] The potential difference between the spacer 42 and the fastener 41 can be 0.68V, 0.72V, 0.78V, 0.82V, 0.9V, 1V, etc.

[0147] In the above scheme, by limiting the potential difference between the spacer 42 and the fastener 41 to no more than 1V, the corrosion rate of the sacrificial spacer 42 can be controlled within a reasonable range. This ensures effective protection for the fastener 41 to a certain extent while preventing the spacer 42 from failing prematurely due to excessive corrosion, thus achieving long-term and stable anti-corrosion performance of the entire fastening assembly 40.

[0148] In some embodiments, the orthographic projection of the fastening flange 412 onto the first structural member 60 is located within the orthographic projection of the spacer 42 onto the first structural member 60.

[0149] The contour of the spacer 42 covering the surface of the first structural member 60 can completely encompass and exceed the contour of the lower surface of the fastening flange 412 that contacts it. During final tightening, all the axial clamping force applied by the fastening flange 412 is transferred to the surface of the first structural member 60 through the spacer 42 as an intermediate medium, preventing the flange edge from directly pressing against the housing. First, under the same axial clamping force, the increased area between the spacer 42 and the first structural member 60 directly reduces the average pressure at the contact interface, reducing the risk of damage to the fragile electrophoretic layer on the surface of the first structural member 60 due to pressure concentration. Second, the larger contact area means that a larger static frictional torque can be generated between the spacer 42 and the surface of the first structural member 60. During the tightening of the fastener 41, this frictional torque can effectively resist the circumferential torque generated by the rotation of the threaded pair, which attempts to drive the spacer 42 to rotate as well, thus reliably preventing rotational interference. The spacer 42 remains stationary, which to some extent avoids harmful relative sliding friction between it and the surface of the first structural member 60, thereby avoiding scratches or wear of the electrophoretic layer as a result.

[0150] In the above scheme, by setting the orthographic projection of the fastening flange 412 on the first structural member 60 to be located within the orthographic projection of the spacer 42 on the first structural member 60, a sufficiently large contact area can be provided between the spacer 42 and the first structural member 60. This can prevent the spacer 42 from rotating when the fastener 41 is rotated, thereby further reducing the friction between the spacer 42 and the first structural member 60 and further reducing the risk of damage to the electrophoretic layer on the surface of the first structural member 60.

[0151] In some embodiments, the yield strength of the spacer 42 is less than or equal to 280 MPa.

[0152] For example, the yield strength of the spacer 42 can be 268MPa, 270MPa, 272MPa, 275MPa, 278MPa or 280MPa, etc.

[0153] Yield strength is the critical stress value at which a material begins to undergo irreversible plastic deformation. Controlling the yield strength of the diaphragm 42 at this lower level (≤280MPa) means that the material is more prone to moderate, controllable plastic deformation when subjected to the locking force applied by the fastening flange 412. The softer diaphragm 42 can better conform to the surface of the first structural member 60 under pressure, significantly reducing the average pressure on the contact surface by increasing the actual contact area. This, to some extent, avoids the fragile electrophoretic coating on the housing surface from being crushed or scratched due to excessive local pressure, fundamentally suppressing blistering or peeling phenomena that may be caused by damage to the electrophoretic layer. In terms of sealing function, this plastic deformation capability allows the diaphragm 42 to fully fill the microscopic unevenness between itself and the surface of the first structural member 60, and even adapt to minor unevenness on a macroscopic level, thereby forming a more continuous and dense sealing band at the contact interface. This strengthens the sealing effect of the interface, effectively blocking the infiltration of external water vapor, electrolyte and other corrosive media, and cutting off the path of crevice corrosion or electrochemical corrosion of fastener 41 caused by water seepage through the gap.

[0154] In the above solution, by setting the yield strength of the septum 42 to less than or equal to 280MPa, the electrophoretic layer on the surface of the first structural member 60 can be further protected from damage, the bubbling problem can be improved, and the sealing function of the sealing interface between the septum 42 and the first structural member 60 can be further strengthened, thus improving the phenomenon of water stains penetrating and causing the fastener 41 to be corroded.

[0155] In some embodiments, the yield strength of the spacer 42 is greater than or equal to 250 MPa.

[0156] For example, the yield strength of the spacer 42 can be 250MPa, 252MPa, 255MPa, 260MPa, 262MPa or 265MPa, etc.

[0157] In the above scheme, by limiting the yield strength of the spacer 42 to not less than 250MPa, it is ensured to a certain extent that the spacer 42 has sufficient structural strength and rigidity when subjected to the locking force of the fastener 41.

[0158] In some embodiments, the spacer 42 and the fastening rod 411 are spaced apart.

[0159] The spacer 42 has a through hole through which the fastening rod 411 passes. The shape of this through hole can match the shape of the fastening rod 411; for example, if the fastening rod 411 is cylindrical, then the through hole of the spacer 42 is circular. The diameter of the through hole of the spacer 42 is larger than the diameter of the fastening rod 411, so that when the fastening rod 411 passes through the through hole of the spacer 42 during assembly, it is not easy for jamming or interference to occur. After the spacer 42 is fitted onto the fastening rod 411, there is a gap between the spacer 42 and the fastening rod 411, and the spacer 42 does not contact the fastening rod 411. The spacer 42 is fixed to the fastening rod 411 by the blocking member 43. If the outer surface of the fastening rod 411 has external threads, the spacer 42 does not directly contact the fastening rod 411, and it is not easy to damage the external threads on the surface of the fastening rod 411.

[0160] In the above solution, by setting a gap between the spacer 42 and the fastening rod 411, it is possible to facilitate the assembly between the spacer 42 and the fastener 41, and also to protect the surface of the fastening rod 411 and reduce the risk of the fastening rod 411 being scratched.

[0161] In some embodiments, the distance L between the spacer 42 and the fastening rod 411 is greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

[0162] After the spacer 42 is assembled to the fastener 41, the gap L between the inner wall of the through hole of the spacer 42 and the outer surface of the fastening rod 411 is greater than or equal to 0.2 mm and less than or equal to 0.8 mm. The distance L between the spacer 42 and the fastening rod 411 can be any value between 0.2 mm and 0.8 mm. For example, the distance L between the spacer 42 and the fastening rod 411 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc.

[0163] Setting the distance L between the spacer 42 and the fastening rod 411 to be greater than or equal to 0.2 mm can ensure the smoothness of the assembly of the spacer 42 to the fastening rod 411 to a certain extent. From a machining perspective, the outer surface of the fastening rod 411 after thread forming has certain machining tolerances and thread protrusions. Therefore, setting the distance L between the spacer 42 and the fastening rod 411 to be greater than or equal to 0.2 mm reduces the likelihood of assembly jamming or scratching the thread surface.

[0164] Setting the distance L between the spacer 42 and the fastening rod 411 to less than or equal to 0.8 mm makes it less likely for the spacer 42 to shift or wobble during assembly, thus improving assembly accuracy.

[0165] In the above solution, by limiting the distance L between the spacer 42 and the fastening rod 411 within a suitable range, it can accommodate reasonable tolerances in the bolt processing process while providing sufficient space for the insertion of the spacer 42. Operators can easily and quickly insert the spacer 42 into the designated assembly position along the axial direction of the fastening rod 411 without the need for additional tools. This facilitates the assembly of the spacer 42 and the fastener 41, improves assembly efficiency, and protects the surface of the fastening rod 411. Furthermore, this gap design does not affect the load-bearing capacity of the spacer 42. After the fastener 41 is tightened, the spacer 42 achieves uniform load distribution through its contact with the blocking member 43, which to a certain extent avoids component damage caused by localized stress concentration and improves the stability of the spacer 42 after assembly with the fastener 41.

[0166] Figure 12 This is a schematic diagram of the structure of fasteners according to some embodiments of this application.

[0167] like Figure 12 As shown, in some embodiments, the fastening flange 412 includes a flange contact surface 413 that abuts against the spacer 42; the outer surface of the fastener 41 is provided with an electroplated layer 414, the thickness of the electroplated layer 414 located on the flange contact surface 413 being equal to the thickness of the electroplated layer 414 located on the other surfaces of the fastener 41.

[0168] In traditional electroplating processes, when bolts and gaskets are electroplated together, the gaskets can obscure the bolt flange contact surface 413 they cover, leading to insufficient exchange of the plating solution in this area and resulting in a thin or even missing coating. This embodiment eliminates the obscuring effect by employing a step of "electroplated fastener 41 separately first, then assembling the spacer 42." In the optimized electroplating process, the fastener 41 is suspended in the plating solution as an independent unit, ensuring sufficient and uniform liquid exchange and ion deposition on all its surfaces, including the flange contact surface 413, bolts, and threads. This results in a final metal coating (such as a zinc-nickel alloy layer) covering the entire outer surface of the fastener 41, especially the stress-critical flange contact surface 413, ensuring that the thickness of the plating layer 414 on the flange contact surface 413 is equal to the thickness of the plating layer 414 on the other surfaces of the fastener 41. A uniform and sufficiently thick coating is the physical basis for providing effective sacrificial anode protection or barrier protection. As the main pressure-bearing and contact interface, the flange contact surface 413 has the same coating thickness as the fastening rod 411 and other parts, ensuring that this area has the same corrosion resistance and wear resistance. To a certain extent, it avoids the possibility that the local coating is thin and becomes the primary entry point for corrosion, thereby achieving a comprehensive improvement in the overall corrosion resistance and service life of the fastener 41.

[0169] In the above scheme, by setting the thickness of the electroplated layer 414 located on the flange contact surface 413 to be equal to the thickness of the electroplated layer 414 located on the other surfaces of the fastener 41, the uniformity of the thickness of the electroplated layer 414 on the entire surface of the fastener 41 can be guaranteed to a certain extent, so that the entire surface of the fastener 41 is not easily corroded.

[0170] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery device 100, which is used to provide electrical energy.

[0171] According to some embodiments of this application, this application provides a battery device 100, which includes a first structural member 60, a second structural member 70, and a fastening assembly 40. The first structural member 60 and the second structural member 70 are connected by the fastening assembly 40. The fastening assembly 40 includes a fastener 41, a spacer 42, and a blocking member 43. The fastener 41 includes a fastening rod 411 and a fastening flange 412 disposed on the outer periphery of the fastening rod 411. The fastening rod 411 passes through the first structural member 60 and the second structural member 70 respectively. The spacer 42 is disposed between the fastening flange 412 and the first structural member 60. The spacer 42 has a groove 421 on the side facing the first structural member 60. The blocking member 43 is located in the groove 421 and is engaged with the fastening rod 411. The blocking member 43 includes a retaining ring portion 431 and a plurality of retaining teeth portions 432. The retaining ring portion 431 is arranged around the fastening rod 411 in a circumferential manner, and the plurality of retaining teeth portions 432 are arranged on the side of the retaining ring portion 431 facing the fastening rod 411, and the retaining teeth portions 432 engage with the fastening rod 411.

[0172] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: First structural component; Second structural component; A fastening assembly, wherein the first structural member and the second structural member are connected by the fastening assembly; The fastening assembly includes a fastener, a spacer, and a stopper. The fastener includes a fastening rod and a fastening flange disposed on the outer periphery of the fastening rod. The fastening rod passes through the first structural member and the second structural member respectively. The spacer is disposed between the fastening flange and the first structural member. The spacer has a groove on the side facing the first structural member. The stopper is located in the groove and engages with the fastening rod.

2. The battery device according to claim 1, characterized in that, The battery device further includes a housing structure and multiple battery cells. The housing structure includes a first housing and a second housing. The first structural component is the first housing, and the second structural component is the second housing. The first housing and the second housing are assembled together to form a receiving cavity, and the multiple battery cells are disposed in the receiving cavity.

3. The battery device according to claim 1, characterized in that, The blocking member includes a retaining ring portion and multiple retaining teeth portions. The retaining ring portion is arranged around the circumference of the fastening rod, and the multiple retaining teeth portions are arranged on the side of the retaining ring portion facing the fastening rod, and the retaining teeth portions engage with the fastening rod.

4. The battery device according to claim 3, characterized in that, Along the direction from the retaining ring portion to the fastening rod, the retaining tooth portion is inclined toward the direction of the second structural member.

5. The battery device according to claim 3, characterized in that, The locking tooth portion includes a first locking tooth segment and a second locking tooth segment. The first locking tooth segment is connected to the retaining ring portion. The second locking tooth segment is disposed on the side of the first locking tooth segment facing the fastening rod. At least a portion of the first locking tooth segment includes a first inclined surface, and the second locking tooth segment includes a second inclined surface. Along the direction from the retaining ring portion to the fastening rod, the first inclined surface and the second inclined surface are inclined towards the direction of the second structural member, respectively. The inclination angle of the second inclined surface relative to the plane where the retaining ring portion is located is greater than the inclination angle of the first inclined surface relative to the plane where the retaining ring portion is located.

6. The battery device according to claim 3, characterized in that, The retaining tooth portion includes a first side and a second side disposed opposite to each other. The first side abuts against the fastening rod, and the second side is connected to the retaining ring portion. The thickness of the first side is less than the thickness of the second side.

7. The battery device according to claim 1, characterized in that, The groove includes a top wall and a side wall disposed on the outer periphery of the top wall, the top wall being spaced apart from the first structural member; the blocking member having a gap with the side wall.

8. The battery device according to claim 1, characterized in that, The groove includes a top wall and a side wall disposed on the outer periphery of the top wall, the top wall being spaced apart from the first structural member; the blocking member and the side wall are interference fit.

9. The battery device according to any one of claims 1-8, characterized in that, The potential difference of the spacer is less than the potential difference of the fastener.

10. The battery device according to claim 9, characterized in that, The potential difference between the spacer and the fastener is greater than or equal to 0.5V.

11. The battery device according to claim 10, characterized in that, The potential difference between the spacer and the fastener is less than or equal to 1V.

12. The battery device according to any one of claims 1-8, characterized in that, The fastening flange is projected onto the first structural member in the same direction as the spacer in the same direction as the first structural member.

13. The battery device according to any one of claims 1-8, characterized in that, The yield strength of the spacer is less than or equal to 280 MPa.

14. The battery device according to claim 13, characterized in that, The yield strength of the spacer is greater than or equal to 250 MPa.

15. The battery device according to any one of claims 1-8, characterized in that, The spacer and the fastening rod are spaced apart.

16. The battery device according to claim 15, characterized in that, The distance between the spacer and the fastening rod is greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

17. The battery device according to any one of claims 1-8, characterized in that, The fastening flange includes a flange contact surface that abuts against the gasket; the outer surface of the fastener is provided with an electroplated layer, and the thickness of the electroplated layer on the flange contact surface is equal to the thickness of the electroplated layer on the other surfaces of the fastener.

18. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1-17, the battery device being used to provide electrical energy.

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