Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer assembly and a box body assembly, and the battery monomer assembly is arranged in the box body assembly; the box body assembly comprises a box body, and the box body comprises a composite material part with a first opening; the metal connecting piece comprises a fixing part and a welding part, the fixing part is arranged in the composite material part, the welding part is connected with the fixing part, and the welding part is exposed out of the composite material part through the first opening; and the metal connecting bracket is welded with the welding part and is used for being connected with an external structure. Through the arrangement, the metal connecting piece and the metal connecting support can be used for replacing the composite material part to be connected with the external structure, and the welded metal connecting piece and metal connecting support have higher structural strength compared with the composite material part, so that the connection reliability of the box body and the external structure is improved.

Description

Technical Field

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

[0002] Currently, battery packs typically consist of a battery cell assembly and a housing that houses the assembly. The housing can be connected to an external structure, such as a vehicle body, to secure the battery pack to the external structure. To meet the lightweight requirements of battery packs, some housings are made of composite materials. However, composite materials can have poor reliability when connected to external structures, which can easily lead to connection failure. Utility Model Content

[0003] The present application provides a battery device and an electrical device, aiming to solve the technical problem of poor connection reliability between existing battery devices and external structures.

[0004] In order to solve the above problems, the present application provides a battery device on the one hand, which includes: a battery cell assembly and a box assembly, wherein the battery cell assembly is arranged in the box assembly; the box assembly includes: a box body, wherein the box body includes: a composite material part having a first opening; a metal connector, wherein the metal connector includes: a fixing part and a welding part, wherein the fixing part is arranged in the composite material part, the welding part is connected to the fixing part and is exposed to the composite material part through the first opening; a metal connecting bracket, wherein the metal connecting bracket is welded to the welding part and is used to connect to an external structure.

[0005] In the above solution, the metal connector includes: a fixed portion provided within the composite material portion of the box body, and a welded portion connected to the fixed portion and exposed outside the composite material portion. The welded portion can also be welded to the metal connecting bracket, and the metal connecting bracket can be connected to the external structure. Thus, the metal connector and the metal connecting bracket can replace the composite material portion to connect to the external structure. In this way, the box body can be connected to the external structure using the welded metal connector and the metal connecting bracket. This helps to meet the lightweight requirements of the box assembly while improving the reliability of the connection between the box assembly and the external structure.

[0006] In one embodiment, the box body has a receiving groove for receiving the battery cell assembly, and the composite material part has a stacked inner wall and outer wall corresponding to at least a portion of the fixing part; the inner wall constitutes at least a portion of the groove wall of the receiving groove, the fixing part is located between the inner wall and the outer wall, the outer wall has the first opening, and the welding part is exposed on the side of the outer wall facing away from the inner wall through the first opening.

[0007] Thus, the metal connecting bracket can be arranged outside the accommodating groove to be connected to the external structure outside the accommodating groove, so that the box assembly can be fixed on an external structure such as a vehicle body.

[0008] In one embodiment, the welding portion has a boss welded to the metal connecting bracket, and the boss is protruding relative to the fixing portion along the inner wall toward the outer wall.

[0009] Thus, the welding portion can be welded to the metal connection bracket by utilizing the boss, so as to reduce the difficulty of welding the welding portion and the metal connection bracket.

[0010] In one embodiment, the inner wall is provided with a second opening, the welding portion is exposed in the accommodating groove through the second opening, and the welding portion is recessed along the inner wall toward the outer wall to form the boss.

[0011] Thus, the welding portion can be punched from the inner wall toward the outer wall through the second opening, so that the welding portion can be recessed to form a boss, thereby reducing the difficulty of manufacturing the metal connector.

[0012] In one embodiment, the metal connecting member has a plurality of welding portions, and the metal connecting bracket is welded to the plurality of welding portions.

[0013] Thus, multiple welding portions can be utilized to perform welding with the metal connection bracket, so as to further improve the connection firmness between the metal connector and the metal connection bracket.

[0014] In one embodiment, an adhesive layer is provided on the contact surface between the welding portion and the metal connecting bracket.

[0015] Therefore, the adhesive layer can not only be used to bond the welding part and the metal connecting bracket, but also can be used to cover the bonding interface between the welding part and the metal connecting bracket to improve the corrosion resistance of the connection between the welding part and the metal connecting bracket.

[0016] In one embodiment, the box body further includes: a metal portion connected to the composite material portion, and the metal portion and the composite material portion are jointly arranged to form the accommodating groove.

[0017] Thus, the box body can include a composite material part and a metal part, so that the box body can not only use the composite material part to achieve a lightweight design, but also use the metal part to meet the corresponding requirements of the box.

[0018] In one embodiment, the metal part includes: a first metal part and a second metal part; the first metal part and the second metal part are respectively connected to opposite sides of the composite material part, and together with the composite material part, form the accommodating groove.

[0019] Thus, the two opposite sides of the composite material portion can be connected to the first metal portion and the second metal portion respectively, so that the first metal portion and the second metal portion can be used to meet the corresponding requirements of the box.

[0020] In one embodiment, the outermost layer of the composite material portion is an insulating layer.

[0021] Thus, the composite material portion can have insulating properties, so that the composite material portion can be used to place the battery cell assembly accommodated in the box body, so as to achieve electrical isolation between the battery cell assembly and the box body assembly.

[0022] In one embodiment, an anti-corrosion layer is provided on the surfaces of the box body, the metal connecting piece and the metal connecting bracket.

[0023] Therefore, the anti-corrosion layer can be used to improve the anti-corrosion performance of the box assembly.

[0024] The present application also provides an electrical device, which includes: the above-mentioned battery device.

[0025] Thus, the corresponding structure of the electrical device can be connected to the box assembly of the battery device as an external structure, so as to improve the installation reliability of the battery device on the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0027] Figure 1 is a schematic structural diagram of an electrical device provided in an embodiment of the present application;

[0028] Figure 2 yes Figure 1 Schematic diagram of the structure of the battery device;

[0029] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle part of the box assembly;

[0030] Figure 4 yes Figure 3 A schematic diagram of the partial cross-sectional structure of the middle part of the box assembly along V-V;

[0031] Figure 5 yes Figure 3 A partial enlarged schematic diagram of point A in the middle;

[0032] Figure 6yes Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0033] Figure 7 yes Figure 3 The middle part is a schematic diagram of the structure of the box body from another perspective;

[0034] Figure 8 yes Figure 7 Schematic diagram of the partial cross-sectional structure of the composite material part along V-V.

[0035] The reference numerals are as follows:

[0036] Electrical device 1, battery device 10, controller 20, motor 30, battery cell assembly 100, box assembly 200, box body 210, metal connector 220, metal connecting bracket 230, anti-corrosion layer 240, composite material part 211, inner wall 2111, side wall 2111a, bottom wall 2111b, outer wall 2112, insulating layer 2113, metal part 212, first metal part 2121, second metal part 2122, fixing part 221, welding part 222, boss 2221, contact surface 2222, adhesive layer 2223, accommodating groove 2101, first opening 201, second opening 202. DETAILED DESCRIPTION

[0037] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the technical terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", "second direction", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0045] In some technical solutions, the box that houses the battery cells is made of composite materials, such as high-performance fiber-reinforced resin-based composite materials. Compared to boxes made of metal materials, composite materials have the advantage of being lightweight and can meet the lightweight requirements of the battery box. However, since composite materials are weaker than metal materials in structural strength, the connection strength between the box made of composite materials and the external structure is also weak. In particular, the wear resistance of composite materials is poor. After long-term use, the connection point between the box and the external structure is prone to failure due to wear, which undoubtedly reduces the reliability of the connection between the box and the external structure.

[0046] To solve the above technical problems, the present application provides a battery device, which comprises a metal connector including: a fixing portion provided in the composite material portion of the box body, and a welding portion connected to the fixing portion and exposed outside the composite material portion, wherein the welding portion can also be used to weld to a metal connection bracket, and the metal connection bracket can be connected to an external structure, so that the metal connector and the metal connection bracket can replace the composite material portion to connect to the external structure. In this way, the box body can be connected to the external structure using the welded metal connector and the metal connection bracket, which is conducive to improving the connection reliability between the box assembly and the external structure.

[0047] The battery device involved in the embodiments of the present application can be used in an electrical device that uses the battery device as a power source. The electrical device involved in the embodiments of the present application may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric car, a vehicle, a ship, a spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, a vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and a new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. According to the drive mode, a vehicle may be a front-wheel drive vehicle, a rear-wheel drive vehicle, or a four-wheel drive vehicle.

[0048] Furthermore, the electrical device may include: a device body and a battery device involved in the context. The device body is the main frame structure of the electrical device. For example, when the electrical device is a vehicle, the device body is the vehicle body. When the electrical device is a ship, the device body is the hull. Of course, in some embodiments, the battery device involved in the embodiments of the present application can also be used in an energy storage system that uses a battery device as an energy storage element, and the energy storage system may include an energy storage container, an energy storage cabinet, etc. The following is only an example of the electrical device being a vehicle.

[0049] See also Figures 1 to 2 , Figure 1 is a structural diagram of the electrical device 1 provided in an embodiment of the present application, Figure 2yes Figure 1 Schematic diagram of the structure of the battery device 10.

[0050] like Figure 1 As shown, the electric device 1 provided in the embodiment of the present application can be a vehicle, and a battery device 10 is provided inside the electric device 1. The battery device 10 can be provided at the bottom, head or tail of the electric device 1, and the battery device 10 can serve as an operating power source for the electric device 1 to supply power to the electric device 1. For example, the electric device 1 can also include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to supply power to the motor 30 to meet the working power requirements of the electric device 1 during startup, navigation and driving. Of course, the battery device 10 can not only serve as an operating power source for the electric device 1, but also as a driving power source for the electric device 1, to replace or partially replace fuel or natural gas to provide driving power for the electric device 1.

[0051] The battery device 10 can be used to provide power to the power-consuming device 1, and the battery device 10 can include: a battery cell assembly 100 and a box assembly 200. Figure 2 As shown, the battery cell assembly 100 can be disposed within a housing assembly 200, and the battery cell assembly 100 can be used to provide power to the electrical device 1. The housing assembly 200 can accommodate the battery cell assembly 100 and can be connected to the electrical device 1 to secure the battery assembly 10 to the electrical device 1. For example, if the electrical device 1 is a vehicle, the housing assembly 200 can be connected to the body of the electrical device 1, so that the entire battery assembly 10 can be secured to the body of the electrical device 1.

[0052] The battery cell assembly 100 may include at least one battery cell, and the battery cell may be used to store or release electrical energy to power the electrical device 1 when needed. The battery cell may be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after discharge and continue to be used. Battery cells may include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0053] Furthermore, when there are multiple battery cells, the multiple battery cells can be electrically connected by at least one of series connection, parallel connection, and hybrid connection via a busbar assembly, and can be bundled together to be placed as a whole within the box assembly 200. Of course, the multiple battery cells can also be divided into multiple groups according to a preset number for bundling, and are not limited to being bundled into one group.

[0054] In some embodiments, the connection method of multiple battery cells is not limited to bundling, and multiple battery cells can also be connected in other ways. In some embodiments, multiple battery cells are not limited to being bundled into one body and placed as a whole in the box assembly 200, and multiple battery cells can also be placed independently in the box assembly 200.

[0055] Please combine Figure 2 See Figures 3 and 4 , Figure 3 yes Figure 2 A schematic structural diagram of the middle box assembly 200, Figure 4 yes Figure 3 Schematic diagram of the partial cross-sectional structure of the middle box assembly 200 along V-V.

[0056] The box assembly 200 can accommodate and protect the battery cell assembly 100 and can be connected to the device body of the electric device 1. Figures 2 to 4 As shown, the box assembly 200 may include a box body 210, a metal connector 220, and a metal connecting bracket 230. The box body 210 may include a composite material portion 211 having a first opening 201. The metal connector 220 may include a fixing portion 221 disposed within the composite material portion 211, and a welding portion 222 connected to the fixing portion 221 and exposed from the composite material portion 211 through the first opening 201. The metal connecting bracket 230 may be welded to the welding portion 222 and may be used to connect to an external structure.

[0057] The box body 210 can be a lower box or an upper box, and can be used to place the battery cell assembly 100, and at least part of the box body 210 can be made of composite materials, and the area of ​​the box body 210 made of composite materials can be the aforementioned composite material portion 211. Among them, the composite material portion 211 can include: plastic, resin, fiber and other materials, and the composite material portion 211 can have the advantage of being light weight, which is conducive to achieving a lightweight design of the box assembly 200. It is understandable that in addition to the aforementioned plastics, resins, fibers, etc., the specific materials selected for the composite material portion 211 can also be adjusted according to design requirements, and this embodiment will not be listed here for explanation.

[0058] In some embodiments, both the lower case and the upper case can be a case body 210. That is, the case assembly 200 can include two case bodies 210, each of which can be a lower case or an upper case. The two case bodies 210 can be connected to form a closed accommodation space to accommodate the battery cell assembly 100. The two case bodies 210 can be connected by one or more connection methods such as bonding, welding, clamping, and screwing.

[0059] The metal connector 220 can be entirely embedded within the composite material portion 211, and the portion of the composite material portion 211 where the metal connector 220 is embedded can be perforated or slotted to form a first opening 201, so that a portion of the metal connector 220 can be exposed from the composite material portion 211 through the first opening 201 to form the aforementioned welding portion 222, while the portion of the metal connector 220 that is not exposed can form the aforementioned fixing portion 221. The metal connector 220 can have a structural strength superior to that of the composite material portion 211, which helps to improve the welding strength between the metal connector 220 and the metal connection bracket 230, thereby indirectly improving the connection reliability between the box assembly 200 and the external structure.

[0060] In some embodiments, in addition to being exposed to the composite material portion 211 by later punching or grooving, the composite material portion 211 may also reserve corresponding holes or grooves during the manufacturing process so that the welding portion 222 can be exposed to the composite material portion 211 through the first opening 201 formed by the holes or grooves.

[0061] The metal connection bracket 230 can be welded to the welding portion 222 and can be used to connect to an external structure. The metal connection bracket 230 can also have a structural strength superior to that of the composite material portion 211, which helps improve the welding firmness and convenience of the metal connector 220 and the metal connection bracket 230, thereby indirectly improving the connection reliability between the box assembly 200 and the external structure. At the same time, the metal connection bracket 230 and the external structure can be connected through one or more connection methods such as screwing, riveting, welding, bonding, and clamping. The external structure referred to in this embodiment can be the device body of the electrical device 1, that is, the aforementioned vehicle body.

[0062] Connecting the external structure via metal connection bracket 230 also reduces restrictions on the connection between the box assembly 200 and the external structure. Specifically, the exposed area of ​​the welding portion 222 is limited. If the external structure were directly connected to the welding portion 222, the available connection methods between the external structure and the box assembly 200 would be limited, such as only being able to connect by welding. However, the metal connection bracket 230 welded to the welding portion 222 has a larger connection area, allowing the external structure and the metal connection bracket 230 to be connected using the appropriate connection method as needed.

[0063] In some embodiments, the external structure is not limited to the device body of the electric device 1 , and the external structure may also be other structures included in the battery device 10 that need to be connected to the box assembly 200 .

[0064] In the above solution, the metal connector 220 may include: a fixing portion 221 provided in the composite material portion 211 of the box body 210, and a welding portion 222 connected to the fixing portion 221 and exposed outside the composite material portion 211, and the welding portion 222 may also be welded to the metal connection bracket 230, and the metal connection bracket 230 may be connected to the external structure, so that the metal connector 220 and the metal connection bracket 230 can replace the composite material portion 211 in connecting to the external structure. Compared to the solution in which the composite material portion 211 is directly connected to the external structure, the use of welded metal connectors 220 and metal connection brackets 230 to connect to the external structure can utilize the high structural strength and connection strength of the metal connectors 220 and metal connection brackets 230 to improve the connection reliability between the box assembly 200 and the external structure.

[0065] like Figures 2 to 4 As shown, the box body 210 may have a receiving groove 2101 for accommodating the battery cell assembly 100, and at least a portion of the composite material portion 211 corresponding to the fixing portion 221 may have a stacked inner wall 2111 and an outer wall 2112. The inner wall 2111 may constitute at least a portion of the groove wall of the receiving groove 2101, and the fixing portion 221 may be located between the inner wall 2111 and the outer wall 2112. The outer wall 2112 has a first opening 201, and the welding portion 222 may be exposed on the side of the outer wall 2112 facing away from the inner wall 2111 through the first opening 201.

[0066] The case body 210 may be recessed to form the aforementioned receiving groove 2101, and the receiving groove 2101 may be a portion of the aforementioned receiving space, and the battery cell assembly 100 may be placed in the receiving groove 2101. The composite material portion 211 may be at least a portion of the area of ​​the case body 210 that constitutes the receiving groove 2101, and the inner wall 2111 of the composite material portion 211 may be disposed proximate to the receiving groove 2101, while the outer wall 2112 may be disposed away from the receiving groove 2101. Furthermore, since the composite material portion 211 may be at least a portion of the area of ​​the case body 210 that constitutes the receiving groove 2101, the inner wall 2111 disposed proximate to the receiving groove 2101 may constitute at least a portion of the wall of the receiving groove 2101.

[0067] Furthermore, the inner wall 2111 may include: a side wall 2111a and a bottom wall 2111b connected to each other. The battery cell assembly 100 may be placed on the bottom wall 2111b, and at least a portion of the fixing portion 221 may be located between the side wall 2111a and the outer wall 2112. For example, a portion of the fixing portion 221 may be located between the side wall 2111a and the outer wall 2112, while the remaining portion may be located between the bottom wall 2111b and the outer wall 2112, thereby increasing the contact area between the fixing portion 221 and the composite material portion 211, thereby improving the bonding strength between the fixing portion 221 and the composite material portion 211.

[0068] Furthermore, the welding portion 222 can be exposed on the side of the outer wall 2112 facing away from the side wall 2111a. For example, the side of the outer wall 2112 facing away from the side wall 2111a can be perforated or slotted to form the first opening 201, so that a portion of the metal connector 220 can be exposed through the first opening 201 to form the welding portion 222. Since the welding portion 222 is exposed on the side of the outer wall 2112 facing away from the side wall 2111a, the metal connection bracket 230 can also be disposed outside the receiving groove 2101 and can be welded to the welding portion 222 from the side of the outer wall 2112.

[0069] In some embodiments, the welding portion 222 may be exposed on the side of the outer wall 2112 facing away from the bottom wall 2111b, and the side of the outer wall 2112 facing away from the bottom wall 2111b may be perforated or grooved to form the first opening 201, so that a portion of the metal connector 220 can be exposed through the first opening 201 to form the welding portion 222. At the same time, at least a portion of the fixing portion 221 may be located between the bottom wall 2111b and the outer wall 2112, so that the fixing portion 221 can maintain connection with the welding portion 222.

[0070] It can be understood that the exposed position of the welding part 222 can be selected according to the position where the box assembly 200 is connected to the external structure, and the embedded position of the fixing part 221 can be selected according to the exposed position of the welding part 222. It is only necessary that the fixing part 221 and the welding part 222 can remain connected.

[0071] Through the above-mentioned setting, the metal connecting bracket 230 can be set outside the accommodating groove 2101, so that the metal connecting bracket 230 can be connected to the external structure outside the accommodating groove 2101, such as the body of the electrical device 1, so that the box body 210 can be fixed on the external structure such as the body through the metal connecting part 220 and the metal connecting bracket 230.

[0072] In some embodiments, the welding portion 222 may also be exposed inside the receiving groove 2101, that is, the welding portion 222 may also be exposed on the side of the inner wall 2111 facing away from the outer wall 2112, so that the metal connecting bracket 230 may also be set in the receiving groove 2101 to connect with the external structure in the receiving groove 2101, such as other structures included in the battery device 10 and arranged in the box assembly 200, so that the other structures included in the battery device 10 can be welded to the box body 210 through the welding portion 222.

[0073] like Figure 4 As shown, the welding portion 222 may further include a boss 2221 welded to the metal connection bracket 230 , and the boss 2221 is protruded relative to the fixing portion 221 along the direction from the inner wall 2111 toward the outer wall 2112 .

[0074] A portion of the welding portion 222 may protrude in the direction from the inner wall 2111 toward the outer wall 2112 to form a boss 2221. The boss 2221 may be provided to protrude from the fixing portion 221 in the direction from the inner wall 2111 toward the outer wall 2112. The metal connecting bracket 230 may be in contact with a surface of the boss 2221 facing away from the receiving groove 2101 and may be welded to the boss 2221. The contact surface 2222 where the boss 2221 and the metal connecting bracket 230 contact each other may be flush with a surface of the outer wall 2112 facing away from the inner wall 2111, or the contact surface 2222 may protrude from a surface of the outer wall 2112 facing away from the inner wall 2111. This helps to make the boss 2221 stand out from the outer wall 2112 of the composite material portion 211, thereby facilitating welding of the metal connecting bracket 230 and the boss 2221.

[0075] In some embodiments, the contact surface 2222 can also be recessed on the side of the outer wall 2112 facing away from the inner wall 2111. The boss 2221 only needs to be protruding from the fixing portion 221 in the direction of the outer wall 2112 facing away from the inner wall 2111, thereby reducing the height difference between the contact surface 2222 and the side of the outer wall 2112 facing away from the inner wall 2111. In other words, the specific protruding height of the boss 2221 can be selected based on design requirements, and this embodiment will not be described in detail here.

[0076] Through the above-mentioned setting, the welding part 222 can use the raised boss 2221 to reduce the height difference with the side of the outer wall 2112 facing away from the inner wall 2111, so that the boss 2221 can protrude from the composite material part 211, so as to facilitate the welding of the boss 2221 and the metal connecting bracket 230, thereby reducing the difficulty of welding the welding part 222 and the metal connecting bracket 230.

[0077] In some embodiments, the design of the boss 2221 can also be omitted, and the metal connecting bracket 230 can also be in contact with the side of the welding portion 222 away from the receiving groove 2101, that is, the contact surface 2222, and can be directly welded to the welding portion 222.

[0078] like Figure 4 As shown, the inner wall 2111 is provided with a second opening 202 , and the welding portion 222 is exposed in the accommodating groove 2101 through the second opening 202 , and the welding portion 222 can be recessed along the inner wall 2111 toward the outer wall 2112 to form a boss 2221 .

[0079] One side of the weld portion 222 can be exposed on the side of the outer wall 2112 facing away from the inner wall 2111, while the other opposite side can be exposed on the side of the inner wall 2111 facing away from the outer wall 2112. That is, the inner wall 2111 can be perforated or slotted to form a second opening 202, so that both opposite sides of the weld portion 222 can be exposed to the composite material portion 211 through the first opening 201 and the second opening 202, respectively. This facilitates the processing and formation of the boss 2221 on the weld portion 222. For example, the exposed portion of the weld portion 222 can be stamped at the second opening 202, so that the portion of the weld portion 222 can be recessed in the direction of the outer wall 2112 facing away from the inner wall 2111, thereby forming the aforementioned boss 2221.

[0080] With this arrangement, the exposed area of ​​the welding portion 222 can be stamped from within the receiving groove 2101, so that a portion of the welding portion 222 can be recessed toward the outside of the receiving groove 2101 to form a boss 2221. This helps reduce the difficulty of machining the welding portion 222 to form the boss 2221. Furthermore, compared to a solution in which the welding portion 222 is partially thickened to form the boss 2221, stamping the welding portion 222 to form the boss 2221 not only reduces the material and volume of the metal connector 220, but also simplifies the shape of the metal connector 220, thereby reducing the difficulty of manufacturing the metal connector 220.

[0081] See also Figures 5 and 6 , Figure 5 yes Figure 3 A partial enlarged schematic diagram of point A in the middle, Figure 6 yes Figure 4 A partial enlarged schematic diagram of point B in the middle.

[0082] like Figure 5 As shown, the metal connection member 220 may have a plurality of welding portions 222 , and the metal connection bracket 230 may be welded to the plurality of welding portions 222 .

[0083] Multiple locations of the outer wall 2112 can be perforated or slotted to form multiple first openings 201, allowing multiple areas of the metal connector 220 to be exposed on the side of the outer wall 2112 facing away from the inner wall 2111, thereby forming multiple welding portions 222, such as two, three, four, five, or more. The metal connection bracket 230 can be welded to multiple welding portions 222 simultaneously, thereby utilizing the multiple welding portions 222 to improve the connection strength between the metal connection bracket 230 and the metal connector 220. For example, the number of welding portions 222 can be two, and the metal connection bracket 230 can be welded to both welding portions 222 simultaneously.

[0084] In some embodiments, a metal connector 220 can also be simultaneously connected to multiple metal connection brackets 230. For example, a metal connector 220 can have six welding portions 222, while the number of metal connection brackets 230 can be three, and each metal connection bracket 230 can be welded to two welding portions 222, so that a metal connector 220 can be connected to three metal connection brackets 230.

[0085] In some embodiments, one metal connection bracket 230 can also be simultaneously connected to the welding portions 222 of multiple metal connectors 220. For example, there can be two metal connectors 220, and each metal connector 220 can have two exposed welding portions 222. The metal connection bracket 230 can be simultaneously welded to the welding portions 222 of two metal connectors 220, that is, four welding portions 222, so that one metal connection bracket 230 can be connected to two metal connectors 220.

[0086] It is understandable that, in addition to the solutions shown in the above embodiment, the number of metal connectors 220, welding parts 222 and metal connection brackets 230 can be selected according to design requirements, and this embodiment will not list them one by one here.

[0087] Through the above arrangement, the metal connector 220 can be welded to the metal connecting bracket 230 using multiple welding parts 222, which is conducive to further improving the connection firmness between the metal connector 220 and the metal connecting bracket 230, thereby indirectly improving the connection reliability between the box assembly 200 and the external structure.

[0088] like Figure 6 As shown, an adhesive layer 2223 may be further provided on the contact surface 2222 where the welding portion 222 and the metal connection bracket 230 are in contact.

[0089] To achieve corrosion protection at the interface between the welding portion 222 and the metal connecting bracket 230, before welding the boss 2221 and the metal connecting bracket 230, a high-temperature resistant adhesive, such as a spot welding structural adhesive or a spot welding sealant, may be applied to the contact surface 2222 where the boss 2221 and the metal connecting bracket 230 meet. The high-temperature resistant adhesive may form the aforementioned adhesive layer 2223 on the contact surface 2222. The adhesive layer 2223 may bond the boss 2221 and the metal connecting bracket 230 and fill the gap between the contact surface 2222 and the metal connecting bracket 230, thereby isolating the interface between the boss 2221 and the metal connecting bracket 230 from the external environment.

[0090] In some embodiments, in addition to applying high-temperature resistant glue on the contact surface 2222 of the boss 2221, high-temperature resistant glue can also be applied on the surface where the metal connecting bracket 230 and the contact surface 2222 are in contact. It is only necessary to have an adhesive layer 2223 formed by high-temperature resistant glue between the bonding interface of the metal connecting bracket 230 and the boss 2221.

[0091] Through the above-mentioned setting, not only can the adhesive layer 2223 be used to bond the welding part 222 and the metal connecting bracket 230 to further improve the connection firmness between the welding part 222 and the metal connecting bracket 230, but the adhesive layer 2223 can also cover the fitting interface between the welding part 222 and the metal connecting bracket 230 to improve the corrosion resistance of the box assembly 200 at the connection between the welding part 222 and the metal connecting bracket 230.

[0092] See also Figures 7 and 8 , Figure 7 yes Figure 3 The middle part of the box body 210 is a schematic structural diagram from another perspective. Figure 8 yes Figure 7 Schematic diagram of the partial cross-sectional structure of the middle composite material portion 211 along V-V.

[0093] like Figure 7 As shown, the box body 210 may further include: a metal portion 212 connected to the composite material portion 211 , and the metal portion 212 and the composite material portion 211 may be jointly arranged to form a receiving groove 2101 .

[0094] A portion of the box body 210 may be made of a composite material to form the aforementioned composite material portion 211, while another portion of the box body 210 may be made of a metal material to form the aforementioned metal portion 212. The composite material portion 211 may be connected to the metal portion 212, and the two may together enclose the aforementioned receiving groove 2101. For example, the composite material portion 211 and the metal portion 212 may be joined together by welding, bonding, or snapping, and may be placed together in a mold for molding, so that the receiving groove 2101 is molded on the composite material portion 211 and the metal portion 212.

[0095] In some embodiments, the composite material part 211 and the metal part 212 can also be molded separately to form a partial receiving groove 2101, or the composite material part 211 can be molded to form a partial receiving groove 2101, and the metal part 212 can be stamped to form a partial receiving groove 2101, and then the two are spliced ​​into one body to jointly enclose a complete receiving groove 2101.

[0096] It is understandable that, in addition to the above embodiments, there are many ways to connect the composite material part 211 and the metal part 212, and there are many ways to form the receiving groove 2101, which are not listed here in this embodiment.

[0097] Through the above-mentioned setting, the box body 210 can include: a composite material part 211 and a metal part 212, so that the box body 210 can not only use the composite material part 211 to achieve a lightweight design, but also use the metal part 212 to meet the corresponding requirements of the box assembly 200, such as rigid connection with the external structure, or conductive connection with the external structure, etc.

[0098] like Figure 7 As shown, the metal portion 212 may include a first metal portion 2121 and a second metal portion 2122. The first metal portion 2121 and the second metal portion 2122 may be connected to opposite sides of the composite material portion 211, and may be formed together with the composite material portion 211 to form a receiving groove 2101.

[0099] The box body 210 can be divided into three sections: front, middle and rear. The front section and the rear section can be made of metal materials to form the aforementioned first metal part 2121 and the second metal part 2122, respectively, while the middle section can be made of composite materials to form the aforementioned composite material part 211. At the same time, the first metal part 2121 and the second metal part 2122 can be connected to the opposite sides of the composite material part 211, respectively, and can be jointly formed with the composite material part 211 to form the aforementioned receiving groove 2101. Among them, the connection method of the first metal part 2121 and the second metal part 2122 to the composite material part 211, and the method of the three jointly forming the receiving groove 2101 can be the same or similar to the embodiment of the metal part 212 and the composite material part 211, and will not be repeated here.

[0100] Furthermore, the length of the composite material part 211 in the direction in which the first metal part 2121 is close to the second metal part 2122 is greater than the length of the first metal part 2121 and the second metal part 2122, so that most of the area of ​​the box body 210 can be composed of the composite material part 211, and a small part can be composed of the first metal part 2121 and the second metal part 2122. This arrangement is conducive to reducing the overall weight of the box body 210, thereby realizing a lightweight design of the box body 210.

[0101] In some embodiments, the composite material part 211, the first metal part 2121 and the second metal part 2122 can also be divided in other ways, and are not limited to the front, middle and rear three-section design of the above embodiment. It is only necessary that the box body 210 can include the connected composite material part 211 and the metal part 212. This embodiment will not be listed one by one here.

[0102] Through the above-mentioned setting, the first metal part 2121 and the second metal part 2122 can be respectively set on the opposite sides of the composite material part 211, so as to respectively utilize the first metal part 2121 and the second metal part 2122 to meet the corresponding requirements of the box assembly 200, such as rigid connection with the external structure, or conductive connection with the external structure, etc.

[0103] like Figure 8 As shown, the outermost layer of the composite material portion 211 is an insulating layer 2113 .

[0104] The composite material portion 211 can be made of a composite of various materials, such as plastic, fiber, and resin. Therefore, the composite material portion 211 can have a multi-layer structure from the inside out. Furthermore, the inner wall 2111 of the composite material portion 211 can be used to place the battery cell assembly 100. To maintain electrical isolation from the battery cell assembly 100, the outermost layer of the composite material portion 211 can be an insulating layer 2113. When manufacturing the composite material portion 211, the insulating layer 2113 can be made of a non-metallic material, such as a resin material, so that the composite material portion 211 has insulating properties and maintains electrical isolation from the battery cell assembly 100.

[0105] Through the above arrangement, the composite material portion 211 can also have insulating properties, allowing the composite material portion 211 to be used to place the battery cell assembly 100, thereby maintaining electrical isolation between the battery cell assembly 100 and the box assembly 200. Furthermore, because the composite material portion 211 itself is insulating, there is no need to separately provide an insulating medium on the surface of the composite material portion 211 where the battery cell assembly 100 is placed. This helps simplify the manufacturing process of the box assembly 200 and reduces the manufacturing cost of the box assembly 200.

[0106] like Figure 8 As shown, an anti-corrosion layer 240 is provided on the surface of the box body 210 , the metal connecting piece 220 and the metal connecting bracket 230 .

[0107] In order to improve the overall corrosion resistance of the box assembly 200, after completing the assembly of the box body 210, the metal connector 220 and the metal connecting bracket 230, the box assembly 200 can be electrophoretically processed to form an anti-corrosion layer 240 on the surface of the box assembly 200, that is, the surface of the box body 210, the metal connector 220 and the metal connecting bracket 230, so as to utilize the anti-corrosion layer 240 to isolate the box assembly 200 from the external environment, thereby improving the corrosion resistance of the box assembly 200.

[0108] It is understandable that Figure 8 Only the anti-corrosion layer 240 on the surface of the composite material portion 211 is shown, while the anti-corrosion layer 240 on the metal portion 212 , the metal connector 220 and the metal connecting bracket 230 is the same as or similar to the anti-corrosion layer 240 on the composite material portion 211 .

[0109] Through the above configuration, the anti-corrosion layer 240 can be used to improve the anti-corrosion performance of the box assembly 200 to extend the service life of the box assembly 200.

[0110] Finally, in some specific application scenarios, in order to solve the problem of poor connection reliability between existing battery devices and external structures. The battery device 10 provided in the embodiment of the present application includes: a battery cell assembly 100 and a box assembly 200, the battery cell assembly 100 is arranged in the box assembly 200; the box assembly 200 includes: a box body 210, the box body 210 includes: a composite material part 211 with a first opening 201; a metal connector 220, the metal connector 220 includes: a fixing part 221 and a welding part 222, the fixing part 221 is arranged in the composite material part 211, the welding part 222 is connected to the fixing part 221 and is exposed to the composite material part 211 through the first opening 201; a metal connection bracket 230, the metal connection bracket 230 is welded to the welding part 222 and is used to connect to the external structure.

[0111] The housing body 210 has a receiving groove 2101 for accommodating the battery cell assembly 100. The composite material portion 211 includes a stacked inner wall 2111 and an outer wall 2112 corresponding to at least a portion of the fixing portion 221. The inner wall 2111 forms at least a portion of the groove wall of the receiving groove 2101. The fixing portion 221 is located between the inner wall 2111 and the outer wall 2112. The outer wall 2112 has a first opening 201, and the welding portion 222 is exposed through the first opening 201 on the side of the outer wall 2112 facing away from the inner wall 2111. The welding portion 222 has a boss 2221 welded to the metal connecting bracket 230. The boss 2221 protrudes relative to the fixing portion 221 along the inner wall 2111 toward the outer wall 2112. The inner wall 2111 is provided with a second opening 202 , and the welding portion 222 is exposed in the receiving groove 2101 through the second opening 202 . The welding portion 222 is recessed along the inner wall 2111 toward the outer wall 2112 to form a boss 2221 .

[0112] The box body 210 also includes a metal portion 212 connected to the composite material portion 211. The metal portion 212 and the composite material portion 211 together form a receiving groove 2101. The metal portion 212 can include a first metal portion 2121 and a second metal portion 2122. The first metal portion 2121 and the second metal portion 2122 are connected to opposite sides of the composite material portion 211, respectively, and together with the composite material portion 211, they form the receiving groove 2101. The outermost layer of the composite material portion 211 is an insulating layer 2113. An anti-corrosion layer 240 is provided on the surfaces of the box body 210, the metal connector 220, and the metal connecting bracket 230.

[0113] The box assembly 200 provided in the embodiment of the present application, by providing a metal connector 220, includes: a fixing portion 221 provided in the composite material portion 211 of the box body 210, and a welding portion 222 connected to the fixing portion 221 and exposed to the composite material portion 211, and the welding portion 222 can also be welded to the metal connection bracket 230, and the metal connection bracket 230 can be connected to the external structure, so that the metal connector 220 and the metal connection bracket 230 can replace the composite material portion 211 to connect to the external structure. In this way, the box body 210 can be connected to the external structure using the welded metal connector 220 and the metal connection bracket 230, which is beneficial for meeting the lightweight requirements of the box assembly 200 while improving the connection reliability between the box assembly 200 and the external structure.

[0114] The above is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery device, characterized in that: The battery device comprises: a battery cell assembly and a box assembly, wherein the battery cell assembly is arranged in the box assembly; the box assembly comprises: The box body comprises: a composite material portion having a first opening; a metal connector, the metal connector comprising: a fixing portion and a welding portion, the fixing portion being disposed within the composite material portion, the welding portion being connected to the fixing portion and exposed to the composite material portion through the first opening; A metal connecting bracket is welded to the welding portion and is used to connect to an external structure.

2. The battery device according to claim 1, wherein: The box body has a receiving groove for receiving the battery cell assembly, and the composite material portion has an inner wall and an outer wall that are stacked in a region corresponding to at least a portion of the fixing portion; The inner wall constitutes at least a portion of the groove wall of the accommodating groove, the fixing portion is located between the inner wall and the outer wall, the outer wall has the first opening, and the welding portion is exposed on a surface of the outer wall facing away from the inner wall through the first opening.

3. The battery device according to claim 2, characterized in that The welding portion has a boss welded to the metal connection bracket, and the boss is protruded relative to the fixing portion along the inner wall toward the outer wall.

4. The battery device according to claim 3, characterized in that The inner wall is provided with a second opening, the welding portion is exposed in the accommodating groove through the second opening, and the welding portion is recessed along the inner wall toward the outer wall to form the boss.

5. The battery device according to claim 1, wherein: The metal connecting piece has a plurality of welding portions, and the metal connecting bracket is welded to the plurality of welding portions.

6. The battery device according to claim 1, wherein: An adhesive layer is provided on the contact surface where the welding portion and the metal connecting bracket are in contact.

7. The battery device according to claim 2, characterized in that The box body further includes: a metal portion connected to the composite material portion, and the metal portion and the composite material portion are jointly arranged to form the accommodating groove.

8. The battery device according to claim 7, characterized in that The metal portion includes: a first metal portion and a second metal portion; The first metal part and the second metal part are respectively connected to two opposite sides of the composite material part, and together with the composite material part, they surround and form the accommodating groove.

9. The battery device according to claim 1, wherein: The outermost layer of the composite material portion is an insulating layer.

10. The battery device according to claim 1, wherein: An anti-corrosion layer is provided on the surfaces of the box body, the metal connecting piece and the metal connecting bracket.

11. An electrical device, characterized in that: The electrical device comprises: the battery device according to any one of claims 1-10.

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