Battery device, power utilization device and energy storage device

Abstract

The utility model provides a battery device, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery device comprises a battery monomer, a box body and a fastener, the box body comprises a first part and a second part, and the first part and the second part are installed in a butt joint mode and define a containing cavity for containing the single batteries. The fastener is used for connecting the first part and the second part; the surface, facing the second part, of the first part is provided with an annular groove surrounding the containing cavity, the annular groove is used for containing sealant, and the surface, facing the first part, of the second part is provided with an annular protrusion corresponding to the annular groove. The annular protrusion is constructed to be at least partially inserted into the annular groove and extrude the sealant when the second part and the first part are installed in a butt joint mode, and the orthographic projections of the multiple fasteners on the plane perpendicular to the first direction are located on the periphery of the orthographic projection of the annular groove. The first direction is parallel to the groove depth direction of the annular groove. The number of fastening bolts can be reduced, and the positioning difficulty in the installation process can be lowered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device, a power utilization device and an energy storage device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of society. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] The battery box is usually installed by two parts in abutment to form a containing space for containing battery monomers. The abutment of the box structure requires high positioning accuracy and sealing performance, which results in a long assembly time and is not conducive to improving the production rhythm of the production line. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to solve at least one of the technical problems in the background art. Therefore, one object of the present application is to provide a battery device, a power utilization device and an energy storage device to improve the assembly efficiency.

[0005] Embodiments of the first aspect of the present application provide a battery device, comprising a battery monomer, a box and a fastener. The box comprises a first part and a second part, the first part and the second part are installed in abutment and enclose a containing cavity for containing the battery monomer. The fastener is used to connect the first part and the second part; the surface of the first part facing the second part is provided with an annular groove surrounding the containing cavity, the annular groove is used to contain sealing glue, the surface of the second part facing the first part is provided with an annular protrusion corresponding to the annular groove, the annular protrusion is configured to at least partially insert into the annular groove and extrude the sealing glue when the second part is installed in abutment with the first part. The number of fasteners is multiple, in a plane perpendicular to the first direction, the orthographic projection of the fastener is located in the outer periphery of the orthographic projection of the annular groove; the first direction is parallel to the groove depth direction of the annular groove.

[0006] The technical scheme of the embodiments of the present application can form a continuous, uniform and reliable sealing structure around the accommodating cavity through the mechanical structure design of inserting the annular protrusion into the annular groove and extruding the sealant. The installation and positioning between the annular protrusion and the annular groove are simpler and more reliable, which can reduce the mounting hole positions on the first part and the second part, reduce the requirement for positioning accuracy when the mounting hole positions are aligned, improve the assembly efficiency, provide continuous clamping force between the first part and the second part through the fastener, help to maintain reliable and effective sealing between the first part and the second part, and more help to resist the influence of external impact, vibration and internal pressure change, and reduce the risk of sealing failure caused by loosening of the parts.

[0007] In some embodiments, the annular protrusion comprises a plurality of protruding parts connected in sequence and arranged along the groove width direction of the annular groove, so that a recess part is formed between any two adjacent protruding parts in the plurality of protruding parts. The plurality of protruding parts arranged along the groove width direction can form multiple seals, improve the integrity and reliability of the periphery seal of the accommodating cavity, and avoid the loss of sealing effect of the sealant layer when the battery device vibrates or deforms, resulting in the intrusion of external pollutants or the leakage of internal substances.

[0008] In some embodiments, along the groove depth direction of the annular groove, the recess depth D1 of the recess part is less than the protruding height D2 of the protruding part. The recess depth D1 of the recess part being less than the protruding height D2 of the protruding part can make the sealant more easily fill the recess part, thereby reducing the risk of insufficient sealing reliability due to the existence of gaps in the recess part.

[0009] In some embodiments, the cross-sectional shape of the annular groove is the same as or similar to the cross-sectional shape of the annular protrusion, and the cross-sectional area of the annular groove is greater than or equal to the cross-sectional area of the annular protrusion. The cross-sectional shape of the annular groove being the same as or similar to the cross-sectional shape of the annular protrusion can make the annular groove and the annular protrusion fit better when installed, and the stress of the sealant when extruded will be more uniform, so that the sealant can uniformly fill the gap between the annular groove and the annular protrusion, achieving better sealing effect.

[0010] In some embodiments, the first part further comprises a glue overflow groove adjacent to the annular groove along a groove width direction of the annular groove, the glue overflow groove being configured to accommodate the sealant overflowing from the annular groove. By arranging the glue overflow groove, the overflowing sealant can be effectively collected and accommodated, avoiding the pollution of other areas of the box butt joint surface. In the assembly process, a little more than the theoretically calculated amount of sealant is allowed to be filled in the annular groove, so that after the butt joint extrusion, the sealant can completely fill the gap between the annular groove and the annular protrusion, reducing the risk of local sealing failure caused by insufficient glue. At the same time, the problem of rework or poor sealing caused by glue pollution or uneven distribution due to overfilling is solved.

[0011] In some embodiments, the depth D5 of the glue overflow groove is less than the depth D6 of the annular groove. Controlling the depth of the glue overflow groove to be less than the depth of the annular groove can reduce the excessive weakening of the structural strength of the first part caused by the slotting process on the first part, and improve the structural reliability of the box.

[0012] In some embodiments, the glue overflow groove is in communication with the opening side of the annular groove, and the glue overflow groove and the annular groove form a stepped structure. The communication between the glue overflow groove and the annular groove forming a stepped structure can guide the direction of the glue overflow, more reliably receive the sealant overflowing from the annular groove, and at the same time can improve the processing efficiency and reduce the processing cost.

[0013] In some embodiments, the fastener is four, arranged at the four corners of the box. The space of the four corners is more abundant, and arranging the fastener at the four corners of the box is more conducive to the execution of the assembly operation, reducing the difficulty of assembly.

[0014] In some embodiments, the fastener comprises a pull rivet nut and a fastening bolt, the pull rivet nut comprising a mounting portion and a flange portion located at one end of the mounting portion, the mounting portion being inserted into the first part; the fastening bolt is inserted into the mounting through hole provided in the second part and connected with the mounting portion, so that the flange portion is clamped between the first part and the second part. By cooperating the fastening bolt and the pull rivet nut, the installation process can be simplified, the assembly efficiency can be improved, and the thickness requirement of the second part can be reduced, thereby facilitating the lightweight of the battery box and improving the reliability of the box sealing connection.

[0015] In some embodiments, the first part comprises a first end face facing the second part, and the annular groove is recessed relative to the first end face. The second part comprises a second end face facing the first part, and the annular protrusion is protruded relative to the second end face. The first end face and the second end face are configured to be spaced apart from each other when the first part and the second part are butt jointed and installed, so that the flange portion of the pull rivet nut is located between the first end face and the second end face. In this way, the accuracy requirement of installation positioning can be reduced, and the processing of the first end face and the second end face can be simplified, saving time and facilitating the improvement of assembly efficiency.

[0016] In some embodiments, the maximum size D3 of the annular protrusion relative to the second end face protrusion satisfies: D0 is the maximum height of the flange portion along the direction perpendicular to the first end face, and D4 is the maximum depth of the annular recess relative to the first end face. The depth of the annular protrusion inserted into the annular recess is controlled by the flange portion of the pull nut, so that the extrusion of the sealing glue can be better controlled, and excessive extrusion can be avoided to prevent the sealing glue from overflowing or flowing out.

[0017] In some embodiments, the first portion includes a first end face facing the second portion, and the annular recess is recessed relative to the first end face. The second portion includes a second end face facing the first portion, and the annular protrusion is protruded relative to the second end face. The first end face and the second end face are configured to abut each other when the first portion and the second portion are installed in abutment. The abutment of the large-area end faces enhances the overall rigidity and anti-deformation capability of the connection between the two portions of the box, better protects the internal battery monomers, and reduces the risk of sealing failure caused by vibration or external impact.

[0018] In some embodiments, in the case where the first portion and the second portion are connected by the pull nut with the flange portion, at least one of the first portion and the second portion is provided with a countersunk hole for accommodating the flange portion of the pull nut. By accommodating the flange portion of the pull nut through the countersunk hole, the pull nut fastening connection can be applied when the first portion and the second portion need to abut each other, which simplifies the processing complexity of the installation site, improves the assembly efficiency and the reliability of the connection.

[0019] In some embodiments, the embodiments of the third aspect of the present application provide a power utilization device, which comprises the above-mentioned battery device for providing electric energy.

[0020] In some embodiments, the embodiments of the fourth aspect of the present application provide an energy storage device, which comprises a plurality of the above-mentioned battery monomers or a plurality of the above-mentioned battery devices for storing or providing electric energy.

[0021] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented in accordance with the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] In the drawings, identical or similar components or elements are denoted by identical reference numerals throughout the several views, unless otherwise specified. The drawings are not necessarily to scale. It is to be understood that the drawings only depict several embodiments in accordance with the disclosure and should not be considered as limiting the scope of the disclosure.

[0023] Figure 1Structural schematic diagram of a vehicle for some embodiments of the present application;

[0024] Figure 2 Structural schematic diagram of a battery device for some embodiments of the present application;

[0025] Figure 3 Structural schematic diagram of a battery device for some embodiments of the present application;

[0026] Figure 4 Top view of a battery device for some embodiments of the present application;

[0027] Figure 5 Structural schematic diagram of a battery device for some embodiments of the present application; Figure 4 Structural schematic diagram of a battery device for some embodiments of the present application;

[0028] Figure 6 Enlarged view of a battery device for some embodiments of the present application at B;

[0029] Figure 7 Enlarged view of a battery device for some embodiments of the present application at B;

[0030] Figure 8 Structural schematic diagram of a battery device for some embodiments of the present application; Figure 4 Structural schematic diagram of a battery device for some embodiments of the present application;

[0031] Explanation of reference signs:

[0032] Vehicle 1000;

[0033] Battery device 100, controller 200, motor 300;

[0034] Battery cell assembly 10, battery cell 11, box 20;

[0035] Second part 21, annular protrusion 210, protrusion part 2101, recess part 2102, second end surface 211;

[0036] First part 22, annular groove 220, sealing glue 221, glue overflow groove 222, first end surface 223;

[0037] Fastener 23, pull rivet nut 231, mounting part 2311, flange part 2312, fastening bolt 232. DETAILED DESCRIPTION

[0038] The embodiments of the technical solutions of the present application will be described in detail below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise required by context, singular terms shall include pluralities and vice versa. Unless otherwise required by context, the use herein of the singular is also to be construed as a use of the plural and vice versa.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0041] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to a particular embodiment, or to a particular set of embodiments, and is not necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, a and / or b, which means that there are three cases of a alone, a and b together, and b alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application. The orientation or position of the device or element indicated by the above technical terms must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0047] In the conventional design of the current power battery, the pull rivet nut is generally arranged on the lower box body, the upper cover is opened and locked at the corresponding position, the through hole is arranged, the sealing strip is arranged at the sealing interface of the upper cover and the lower box body, and then the bolt is used to press the upper cover and lock the pull rivet nut position of the lower box body. The pull rivet nut and bolt locking method of the above-mentioned lower box body and upper cover often leads to the following problems: dozens of nuts are often arranged on the conventional box body, the bolt is locked after the upper cover and the box body are assembled and positioned, and the assembly and locking time is often long, which is not conducive to improving the production rhythm of the production line. On the other hand, in order to cope with the relatively harsh working conditions of the battery pack, the pull rivet nut and the bolt often have high strength requirements for fasteners, thereby generating high cost. The whole circle pull rivet nut of the box body and the matched upper cover require high relative position degree, in addition to the single piece position degree of the pull rivet nut of the lower box body and the installation through hole of the upper cover, the relative position degree of the two also needs to be considered, which is easy to cause the problem of unable to assemble due to hole misalignment. Moreover, the matching degree of parts manufactured by different suppliers exists deviation, the supplier end needs to optimize and improve the mold for many rounds, which is not conducive to the rapid mass production of the project. At the same time, if the profile and flatness of the sealing flange surface of the upper cover exist problems, the sealing interface matched with the box body is easy to cause air tightness failure problem.

[0048] To solve the above problems, the battery device provided in the embodiments of the present application comprises a battery cell, a box body and a fastener. The box body comprises a first part and a second part, the first part and the second part are installed in abutment and jointly enclose a containing cavity for containing the battery cell. The fastener is used to connect the first part and the second part; a surface of the first part facing the second part is provided with an annular groove surrounding the containing cavity, the annular groove is used to contain sealant, and a surface of the second part facing the first part is provided with an annular protrusion corresponding to the annular groove, the annular protrusion is configured to at least partially insert into the annular groove and extrude the sealant when the second part is installed in abutment with the first part. The normal projection of the plurality of fasteners in a plane perpendicular to the first direction is located at the periphery of the normal projection of the annular groove; the first direction is parallel to the groove depth direction of the annular groove. Through the mechanical structure design of the annular protrusion inserting into the annular groove and extruding the sealant, a continuous, uniform and reliable sealing structure can be formed around the containing cavity, the installation positioning between the annular protrusion and the annular groove is simpler and more reliable, the mounting hole positions on the first part and the second part can be reduced, not only the use of fastening parts can be reduced, but also the positioning accuracy requirement when the mounting hole positions are aligned can be reduced, and the assembly efficiency is improved. The continuous locking force provided by the fastener maintains the reliable and effective sealing between the first part and the second part, which is more conducive to resisting the influence of external impact, vibration and internal pressure change, and reducing the risk of sealing failure caused by part loosening. The fasteners are distributed at the periphery of the sealing ring, which can reduce the adverse effects that the installation of the fasteners may have on the sealant, and is more conducive to improving the reliability of the sealing.

[0049] The technical solutions described in the embodiments of the present application are suitable for a battery device, a power consumption device using the battery device and an energy storage device.

[0050] The energy storage device using the battery device as a power source in the embodiments of the present application comprises one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can comprise a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device comprises a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device.

[0051] The energy storage device can be used in an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system or a temporary power supply system, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during the low electricity consumption period, and provide electrical energy for related users or power consumption devices during the high electricity consumption period. The energy storage system provided in the embodiments of the present application can be any power system that needs to use the energy storage device. As an example, the energy storage device is an energy storage container or an energy storage cabinet.

[0052] The power consumption device using the battery apparatus as a power source in the embodiments of the present application can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0053] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described energy storage device and power consumption device, but can also be applied to all battery apparatuses including a box body and power consumption devices using the battery apparatus, so that the sealing effect of the box body can be improved, and the safety and long-term operation of the battery apparatus can be ensured.

[0054] The following embodiments are described for convenience with a power consumption device in an embodiment of the present application as an example of a vehicle 1000.

[0055] Please refer to Figure 1 , Figure 1 A structural schematic diagram of the vehicle 1000 provided by some embodiments of the present application is shown. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile. The vehicle 1000 is internally provided with a battery apparatus 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery apparatus 100 can be used for power supply of the vehicle 1000, for example, the battery apparatus 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery apparatus 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0056] In some embodiments of the present application, the battery apparatus 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0057] Please refer to Figure 2 The battery apparatus 100 mentioned in the embodiments of the present application can include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 can include a plurality of battery cells 11 connected in series, in parallel, or in a mixed connection mode through a busbar component.

[0058] In some embodiments, the battery cell assembly 10 is typically formed by arranging a plurality of battery cells 11.

[0059] As an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 11 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 11 together with cable ties.

[0060] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 20 and one or more individual battery cells 10, with the individual battery cells 10 housed within the housing 20. The housing 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of combinations of simple cuboids, cylinders, or spheres. The material of the housing 20 can be an alloy such as aluminum alloy or iron alloy, a polymer such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0061] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the housing 20 by fixing the battery module in the housing 20.

[0062] As an example, the battery cell assembly 10 can also be housed in the housing 20 by directly fixing multiple battery cells 11 to the housing 20.

[0063] As an example, the housing 20 may include a first part 22 and a second part 21. The first part 22 and the second part 21 are fastened together to form a closed space inside the housing 20 to house the battery cell assembly 10. Here, "closed" refers to covering or closing, and can be either non-sealed or sealed to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11. The first part 22 may be a top cover or a bottom plate.

[0064] As an example, the housing 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 20 forms an enclosed space to house the battery cell assembly 10.

[0065] The battery cell 11 provided in the embodiments of this application can be a secondary battery. A secondary battery refers to a battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0066] The battery cell 11 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0067] Figure 3 A structural schematic diagram of a battery device of some embodiments of the present application, Figure 4 A top view of a battery device of some embodiments of the present application, Figure 5 A structural schematic diagram of a battery device of some embodiments of the present application, Figure 4 A cross-sectional schematic diagram of a battery device of some embodiments of the present application at the A-A plane.

[0068] Please refer to Figures 3 to 5 The embodiments of the present application provide a battery device 100, comprising a battery cell 11 and a box body 20. The box body 20 comprises a first part 22 and a second part 21, the first part 22 and the second part 21 are installed in abutment and jointly enclose a containing cavity for containing the battery cell 11. A fastener 23 is used to connect the first part 22 and the second part 21; the surface of the first part 22 facing the second part 21 is provided with an annular groove 220 surrounding the containing cavity, the annular groove 220 is used to contain sealing glue 221, and the surface of the second part 21 facing the first part 22 is provided with an annular protrusion 210 corresponding to the annular groove 220, the annular protrusion 210 is configured to at least partially insert into the annular groove 220 and extrude the sealing glue 221 when the second part 21 is installed in abutment with the first part 22. The number of fasteners 23 is multiple, and the orthographic projection of the fastener 23 in the plane perpendicular to the first direction X is located on the periphery of the orthographic projection of the annular groove 220; the first direction X is parallel to the groove depth direction of the annular groove 220.

[0069] In the embodiments, the box body 20 is designed as a split structure, comprising a first part 22 and a second part 21. In the assembled state, the first part 22 and the second part 21 are installed in abutment along a specific joint surface. After abutment, the first part 22 and the second part 21 jointly enclose a complete, sealed space for containing and protecting the battery cell 11, which is a containing cavity. An annular groove 220 is provided on the surface of the first part 22 facing the second part 21 (i.e. the abutment surface). The annular groove 220 continuously extends around the entire edge of the containing cavity to form a closed annular ring. The core function of the above-mentioned annular groove 220 is to contain sealing glue 221. Before assembly, the sealing glue 221 needs to be pre-applied or injected into the annular groove 220. The cross section of the annular groove 220 perpendicular to its extension direction can be rectangular, semicircular, circular arc or inverted trapezoidal.

[0070] On the surface of the second part 21 towards the first part 22, there is an annular protrusion 210 corresponding to the annular groove 220 of the first part 22. When the second part 21 is docked with the first part 22, the annular protrusion 210 of the second part 21 is configured to be partially or entirely inserted into the annular groove 220 of the first part 22. During the insertion process, the annular protrusion 210 will squeeze the sealant 221 pre-filled in the groove. The sealant 221 can be silicone sealant 221, polyurethane sealant 221, modified silane polymer sealant 221, etc. or a mixture of several of them, which has good bonding effect and flexibility and can withstand high temperature.

[0071] The cross section of the annular protrusion 210 perpendicular to its extension direction can be adapted to the cross section of the annular groove 220, specifically, the cross section shapes of the two can be the same or different.

[0072] During the docking and installation of the first part 22 and the second part 21 of the box 20 in place, the annular protrusion 210 of the second part 21 is at least partially inserted into the annular groove 220 of the first part 22, and the sealant 221 in the annular groove 220 is squeezed. The squeezed sealant 221 will fully fill the gap between the annular protrusion 210 and the wall of the annular groove 220, so that the sealant 221 better bonds the first part 22 and the second part 21 and seals the installation interface between the first part 22 and the second part 21.

[0073] In this embodiment, some extreme working conditions require higher requirements for the battery device 100, such as the need to maintain good self-strength and air tightness in a frequently vibrating and violently impacting environment, or the need to resist the pressure of the gas generated inside after multiple cycles, etc. In this embodiment, the battery device 100 can be reinforced by the fastener 23. Since the combination of the annular groove 220, the annular protrusion 210 and the sealant 221 already has good sealing effect, the number of fasteners 23 used is small and only needs to be fixed at positions where there is a greater risk of leakage.

[0074] The fastener 23 can be a standardized or customized part for mechanical connection, and its core function is to apply locking force, which is used in this device as a connecting element for connecting the first part 22 and the second part 21 of the box 20. By applying controllable locking force through multiple fasteners 23, the first part 22 and the second part 21 can be reliably sealed and connected after docking and installation. The fastener 23 can include but is not limited to a combination of bolts and nuts, self-tapping screws, machine screws, rivets, etc., and can be selected according to the material, strength requirements, disassembly needs, etc. of the box 20. The number and position of the fastener 23 can be set as needed, for example, it can be set to multiple and uniformly distributed on the outer periphery of the receiving cavity.

[0075] Referring to Figures 4 to 5 In this embodiment, the battery box 20 is generally cuboid, the first direction X is parallel to the groove depth direction of the annular groove, and the projection of the annular groove 220 on a plane perpendicular to the first direction X is a closed rectangle. The orthogonal projection of the fastener 23 on the plane is located on the periphery of the closed rectangle.

[0076] In this embodiment, the mechanical structure design of inserting the annular protrusion 210 into the annular groove 220 and extruding the sealant 221 can form a continuous, uniform and reliable sealing structure around the accommodation cavity. The installation and positioning between the annular protrusion 210 and the annular groove 220 are simpler and more reliable, which can reduce the installation hole positions on the first part 22 and the second part 21. Not only can the use of fastening parts be reduced, but also the positioning accuracy requirement when aligning the installation hole positions can be reduced, and the assembly efficiency can be improved. The continuous locking force provided by the fastener 23 can maintain the reliable and effective sealing between the first part 22 and the second part 21, which is more conducive to resisting the influence of external impact, vibration and internal pressure change, and reducing the risk of sealing failure caused by loose parts. The fastener 23 is distributed on the periphery of the sealing ring, which can reduce the adverse effects of damage to the sealant 221 when installing the fastener 23, and is more conducive to improving the reliability of the sealing.

[0077] According to some embodiments of the present application, the annular protrusion 210 includes a plurality of protruding portions 2101 connected in sequence and arranged at intervals along the groove width direction of the annular groove 220, so that a recessed portion 2102 is formed between any two adjacent protruding portions 2101 in the plurality of protruding portions 2101.

[0078] In this embodiment, as Figure 7As shown, the annular protrusion 210 is composed of a plurality of independent protruding portions 2101 which are connected to each other and jointly form a multi-layer annular profile around the accommodating cavity. The annular groove 220 has a certain width along the thickness direction of the sidewall of the first portion 22. Since the plurality of protruding portions 2101 are arranged at intervals along the groove width direction of the annular groove 220, a gap region or a vacant portion between two adjacent protruding portions 2101 forms a recessed portion 2102. The recessed portion 2102 can be a pit which is additionally processed on the surface of the second portion 21 of the box body 20, or can be a region which is lower in height relative to the top of the protruding portion 2101, or even can be a region which is as low as the base surface of the second portion 21. When the annular protrusion 210 extends into the annular groove 220, the plurality of protruding portions 2101 jointly extrude the sealant 221, and the sealant 221 can enter the recessed portion 2102, thereby forming a multi-layer annular sealing structure at the contact position of the first portion 22 and the second portion 21.

[0079] In the embodiment, the plurality of protruding portions 2101 arranged along the groove width direction can form a multi-layer sealing, improve the integrity and reliability of the sealing of the periphery of the accommodating cavity, and avoid the invasion of external pollutants or the leakage of internal substances due to the loss of sealing effect of the sealant layer when the battery device 100 is vibrated or deformed.

[0080] According to some embodiments of the present application, along the groove depth direction of the annular groove 220, the recessed depth D1 of the recessed portion 2102 is less than the protruding height D2 of the protruding portion 2101.

[0081] Please refer to Figures 5 to 7 In the embodiment, since the annular groove 220 is arranged as a closed annular groove along the opening of the first portion 22, the groove depth direction of the annular groove 220 is arranged along the height direction of the first portion 22. The annular protrusion 210 composed of the plurality of protruding portions 2101 protrudes a certain height relative to the first portion 22. Since the recessed portion 2102 is located between the plurality of protruding portions 2101, the recessed portion 2102 has a certain recessed depth relative to the protruding portion 2101 along the height direction of the first portion 22. The recessed depth D1 of the recessed portion 2102 is less than the protruding height D2 of the protruding portion 2101, so that the annular protrusion 210 as a whole protrudes relative to the second portion 21.

[0082] In the embodiment, arranging the recessed depth D1 of the recessed portion 2102 to be less than the protruding height D2 of the protruding portion 2101 can make the sealant 221 more easily fill the recessed portion 2102, thereby reducing the risk of insufficient sealing reliability due to the existence of a gap in the recessed portion 2102.

[0083] According to some embodiments of the present application, the cross-sectional shape of the annular groove 220 is the same as or similar to that of the annular protrusion 210, and the cross-sectional area of the annular groove 220 is greater than or equal to that of the annular protrusion 210.

[0084] As shown in FIG. 2, the first part 22 further comprises an annular protrusion 210 and an annular groove 220. Figures 4 to 5 As shown in FIG. 2, the first part 22 further comprises an annular protrusion 210 and an annular groove 220. When the cross-sectional shape of the annular groove 220 is the same as that of the annular protrusion 210, the cross-sectional area of the annular groove 220 is equal to that of the annular protrusion 210. When the cross-sectional shape of the annular groove 220 is similar to that of the annular protrusion 210 (i.e., the two shapes have the same corresponding angles and have corresponding sides in proportion, and the two shapes are similar in mathematical definition), the cross-sectional area of the annular groove 220 is greater than that of the annular protrusion 210. For example, when the cross-section of the annular groove 220 is a semicircle, the cross-section of the annular protrusion 210 is arranged as a semicircle with a smaller radius. The cross-sectional shape of the annular groove 220 and the annular protrusion 210 can be further arranged as a semicircle, an arc, a rectangle, a triangle, or a trapezoid, etc.

[0085] In the present embodiment, the cross-sectional shape of the annular groove 220 is the same as or similar to that of the annular protrusion 210, which can make the annular groove 220 and the annular protrusion 210 fit better during installation, and the stress on the sealant 221 during extrusion can be more uniform, so that the sealant 221 can uniformly fill the gap between the annular groove 220 and the annular protrusion 210, achieving a better sealing effect.

[0086] According to some embodiments of the present application, the first part 22 further comprises a sealant overflow groove 222 adjacent to the annular groove 220 along the groove width direction of the annular groove 220, which is used to accommodate the sealant 221 overflowing from the annular groove 220.

[0087] As shown in FIG. 2, the first part 22 further comprises an annular protrusion 210 and an annular groove 220. Figure 6In the embodiment, the overflow groove 222 is located on the surface of the opening of the first part 22 and is adjacent to the annular groove 220 in the thickness direction of the sidewall of the first part 22. Specifically, the overflow groove 222 can be arranged on the outer side (far from the accommodating cavity), the inner side (close to the accommodating cavity), or both the inner and outer sides of the annular groove 220. The overflow groove 222 can be an annular groove adjacent to the annular groove 220 and parallel to the extending direction. When the second part 21 of the box body 20 is installed in abutment with the first part 22, the annular protrusion 210 of the second part 21 is inserted into the annular groove 220 of the first part 22 to extrude the sealant 221 pre-filled in the groove. In an ideal case, most of the sealant 221 will fill the gap between the protrusion and the groove wall. However, due to factors such as manufacturing tolerance, assembly accuracy, or slight fluctuations in the filling amount of the sealant 221, part of the sealant 221 will usually be extruded out of the annular groove 220. Due to the presence of the overflow groove 222, the excess sealant 221 that is extruded out will not flow disorderly to other areas of the box body 20, but will be guided and accommodated into the adjacent overflow groove 222. That is, the overflow groove 222 provides a pre-ordered sealant accommodating space.

[0088] In the embodiment, by arranging the overflow groove 222, the overflow of the sealant 221 is effectively collected and accommodated, avoiding the pollution of the overflow sealant to other areas of the abutment surface of the box body 20. In the assembly process, a little more than the theoretically calculated amount of sealant 221 is allowed to be filled in the annular groove 220, ensuring that after abutment extrusion, the sealant 221 can completely fill the gap between the annular groove 220 and the annular protrusion 210, reducing the risk of local sealing failure due to insufficient glue, and solving the problem of rework or poor sealing caused by glue pollution or uneven distribution due to overfilling.

[0089] According to some embodiments of the present application, the groove depth D5 of the overflow groove 222 is less than the groove depth D6 of the annular groove 220.

[0090] In the embodiment, since the overflow is caused by manufacturing tolerance, assembly accuracy, or slight fluctuations in the filling amount of the sealant 221, the amount of overflow is relatively small compared to the sealant 221 in the annular groove 220.

[0091] It can be understood that the overflow groove 222 itself has a certain depth but does not need to be too large, such as Figure 7 As shown, the groove depth D5 of the overflow groove 222 refers to the maximum dimension of the groove bottom of the overflow groove 222 from the first end surface 223 in the direction perpendicular to the first end surface 223 of the first part 22 facing the second part 21. The groove depth D6 of the annular groove 220 is also the maximum dimension of the groove bottom of the annular groove 220 from the first end surface 223 in the direction perpendicular to the first end surface 223 of the first part 22 facing the second part 21.

[0092] In the embodiment, the presence of the overflow groove 222 increases the opening size of the first end surface 223, which can adversely affect the structural strength of the first part 22. In consideration of the amount of overflow glue and the structural strength of the box body, the depth D5 of the overflow groove 222 is controlled to be less than the depth D6 of the annular groove 220, so that the overflow glue can be received while reducing the adverse effect on the structural strength of the box body 20.

[0093] According to some embodiments of the present application, the overflow groove 222 is in communication with the opening side of the annular groove 220, and the overflow groove 222 and the annular groove 220 form a stepped structure.

[0094] In the embodiment, in order to ensure that the overflow glue generated during the extrusion of the sealing glue 221 can smoothly enter the overflow groove 222, the opening side of the annular groove 220 is arranged to be in communication with the overflow groove 222 in structure, as shown in Figure 7 The edge of the overflow groove 222 and the opening of the annular groove 220 form a progressive stepped structure, and when the sealing glue 221 fills the annular groove 220 and starts to overflow into the overflow groove 222, the overflow glue flows along the progressive stepped structure to the overflow groove 222.

[0095] In some embodiments, the overflow groove 222 and the annular groove 220 can be machined together, for example, by the same cutting process, which can improve the processing efficiency.

[0096] In the embodiment, the overflow groove 222 and the annular groove 220 form a stepped structure in communication, which can guide the direction of the overflow glue, more reliably receive the overflow sealing glue 221 in the annular groove 220, and improve the processing efficiency and reduce the processing cost.

[0097] According to some embodiments of the present application, the fastener 23 is four, which is arranged at the four corners of the box body 20.

[0098] In the embodiment, since the box body 20 is arranged in a cuboid shape, the projection of the opening of the first part 22 along the first direction X is a rectangle, and the four corners have relatively sufficient arrangement area, which can be more conducive to the arrangement and installation of the fastener 23.

[0099] In the embodiment, the arrangement space of the four corners is more sufficient, and arranging the fastener 23 at the four corners of the box body 20 is conducive to the execution of the assembly operation and reduces the difficulty of installation of the fastener 23.

[0100] According to some embodiments of the present application, the fastener 23 comprises a pull nut 231, the pull nut 231 comprising a mounting portion 2311 and a flange portion 2312 located at one end of the mounting portion 2311, the mounting portion 2311 being inserted into the first portion 22; a fastening bolt 232 being inserted into the mounting through hole of the second portion 21 and connected with the mounting portion 2311, so that the flange portion 2312 is clamped between the first portion 22 and the second portion 21.

[0101] Please refer to Figure 5 In the embodiment, the pull nut 231 selected by the fastener 23 can be composed of the flange portion 2312 at the end and the mounting portion 2311 inserted into the workpiece to be installed. When the mounting portion 2311 is inserted into the first portion 22, a pull force is applied to the mounting portion 2311 by using a pull nut tool, so that a part of the sidewall of the mounting portion 2311 is permanently plastically deformed, thereby achieving non-detachable locking, and the flange portion 2312 is partially or entirely exposed outside the first portion 22. The fastening bolt 232 is inserted into the mounting through hole of the second portion 21 and inserted into the pull nut 231 along the groove depth direction of the annular groove 220, thereby completing the connection of the first portion 22 and the second portion 21, and at this time, the flange portion 2312 is clamped between the first portion 22 and the second portion 21.

[0102] In the embodiment, through the cooperation of the fastening bolt 232 and the pull nut 231, the installation process can be simplified, the assembly efficiency can be improved, and the requirement for the plate thickness of the second portion 21 can be reduced, thereby being conducive to realizing the lightweight of the box body 20 and improving the reliability of the sealed connection of the box body 20.

[0103] According to some embodiments of the present application, the first portion 22 comprises a first end face 223 facing the second portion 21, and the annular groove 220 is recessed relative to the first end face 223. The second portion 21 comprises a second end face 211 facing the first portion 22, and the annular protrusion 210 is protruded relative to the second end face 211. The first end face 223 and the second end face 211 are configured to be spaced apart from each other when the first portion 22 and the second portion 21 are abutted and installed, so that the flange portion 2312 of the pull nut 231 is located between the first end face 223 and the second end face 211.

[0104] In the embodiment, the first end face 223 is the surface of the first portion 22 facing the second portion 21 (i.e. along the abutting direction), and the second end face 211 is the surface of the second portion 21 facing the first portion 22 (i.e. along the abutting direction). The first end face 223 and the second end face 211 are the core areas of the contact between the first portion 22 and the second portion 21. The annular groove 220 is recessed relative to the first end face 223, and the annular protrusion 210 (whether it is one protrusion portion 2101 or composed of a plurality of protrusion portions 2101) is protruded relative to the second end face 211, both of which can be directly formed by stamping or the like.

[0105] When the first part 22 and the second part 21 of the box 20 are connected by the pull-rivet nut 231, the flange portion 2312 of the pull-rivet nut 231 protrudes from the surface of the first part 22 and protrudes from the first end face 223 by a certain height. When the fastening bolt 232 is used to connect the first part 22 and the second part 21, a gap is formed between the first end face 223 and the second end face 211 due to the flange portion 2312 of the pull-rivet nut 231. In some embodiments, the sealant 221 filled in the gap can form a continuous sealant layer with a certain thickness around the core annular sealing area after curing. The sealant layer and the sealant 221 in the core sealing area form a composite sealing system.

[0106] In the embodiment, the first end face 223 and the second end face 211 are configured to be spaced apart from each other when the first part 22 and the second part 21 are connected, so that the flange portion 2312 of the pull-rivet nut 231 is located between the first end face 223 and the second end face 211. In this way, the accuracy requirement of installation and positioning can be reduced, the processing of the first end face 223 and the second end face 211 can be simplified, the working hours can be saved, and the assembly efficiency can be improved.

[0107] According to some embodiments of the present application, the maximum size D3 of the annular protrusion 210 protruding from the second end face 211 satisfies: D0 is the maximum height of the flange portion 2312 in the direction perpendicular to the first end face 223, and D4 is the maximum depth of the annular groove 220 recessed from the first end face 223.

[0108] In this embodiment, the flange portion 2312 has a maximum thickness D0 in the direction perpendicular to the first end face 223, and the maximum groove depth D4 of the annular groove 220 refers to the maximum vertical distance from the first end face 223 to the bottom of the annular groove 220 on the first part 22 of the box 20. The maximum dimension D3 of the annular protrusion 210 protruding relative to the second end face 211 refers to the maximum vertical distance from the second end face 211 to the top of the annular protrusion 210 on the second part 21 of the box 20. When the annular protrusion 210 has a plurality of protruding portions 2101, the height of the protruding portion 2101 is equal to the maximum dimension D3 of the annular protrusion 210 protruding relative to the second end face 211. When the first part 22 and the second part 21 are abutted and installed by the pull-rivet nut 231 and finally fastened in place, the top of the annular protrusion 210 (or the protruding portion 2101 thereof) of the second part 21 can ensure the compression effect of the annular protrusion 210 on the sealant 221 as much as possible after being inserted into the annular groove 220 of the first part 22. Since the flange portion 2312 is located between the first end face 223 and the second end face 211, under the strong axial locking force provided by the pull-rivet nut 231, the top of the annular protrusion 210 is continuously pressed against the bottom of the annular groove 220, and the flange portion 2312 is rigidly clamped by the first end face 223 and the second end face 211. At this time, the maximum thickness D0 of the flange portion 2312 can determine the depth of the annular protrusion 210 inserted into the annular groove 220. It can be understood that by selecting pull-rivet nuts 231 with different maximum thicknesses D0 of the flange portion 2312, the distance between the first end face 223 and the second end face 211 can be controlled when the fastener 23 is tightened.

[0109] In this embodiment, the depth of the annular protrusion 210 inserted into the annular groove 220 is controlled by the flange portion 2312 of the pull-rivet nut 231, which can better control the extrusion of the sealant 221 and avoid excessive extrusion leading to excessive overflow or loss of the sealant 221.

[0110] According to some embodiments of the present application, the first part 22 includes a first end face 223 facing the second part 21, and the annular groove 220 is recessed relative to the first end face 223. The second part 21 includes a second end face 211 facing the first part 22, and the annular protrusion 210 protrudes relative to the second end face 211. The first end face 223 and the second end face 211 are configured to abut each other when the first part 22 and the second part 21 are abutted and installed.

[0111] In this embodiment, the first end surface 223 is the surface of the first part 22 facing the second part 21 (i.e. along the direction of abutment), and the second end surface 211 is the surface of the second part 21 facing the first part 22. The first end surface 223 and the second end surface 211 are the core areas of the first part 22 and the second part 21 in contact. The annular groove 220 is recessed relative to the first end surface 223, and the annular protrusion 210 (whether one protrusion 2101 or composed of multiple protrusions 2101) is protruded relative to the second end surface 211, both of which can be directly formed by stamping or the like. When the first part 22 and the second part 21 of the box body 20 are abutted and installed by the fastener 23, at this time there is no longer any gasket, buffer ring or the like structure arranged between the first part 22 and the second part 21, nor any related components of the fastener 23, and the fastener 23 directly connects the first end surface 223 and the second end surface 211 together, forming a large-area, tight surface contact between the two, tightly pressed together, except for the annular groove 220, the protrusion area and possibly the overflow groove 222 area.

[0112] In this embodiment, the large-area end surface bonding enhances the overall rigidity and anti-deformation capability of the connection of the first part 22 and the second part 21 of the box body 20, better protects the internal battery monomer 11, and reduces the risk of seal failure due to vibration or external impact.

[0113] According to some embodiments of the present application, in the case where the first part 22 and the second part 21 are connected by the pull rivet nut 231 having the flange portion 2312, at least one of the first part 22 and the second part 21 is provided with a countersunk hole for accommodating the flange portion 2312 of the pull rivet nut 231.

[0114] In this embodiment, in some cases, the use of the pull rivet nut 231 can achieve better axial tension, and the sealing effect can still be ensured with fewer fasteners, at which time a countersunk hole can be provided on at least one of the first part 22 and the second part 21 to accommodate the flange portion 2312 of the pull rivet nut 231, and since the flange portion 2312 is embedded in the countersunk hole, the first part 22 and the second part 21 still remain bonded during installation. The countersunk hole can be arranged on the first part 22 or the second part 21 by turning or the like, or countersunk holes can be arranged on the first part 22 and the second part 21 respectively to accommodate the flange portion 2312.

[0115] In this embodiment, by accommodating the flange portion 2312 of the pull rivet nut 231 through the countersunk hole, the pull rivet nut 231 can be used for fastening connection when the first part 22 and the second part 21 need to be bonded to each other, simplifying the processing complexity of the installation site, improving the assembly efficiency and the reliability of the connection.

[0116] The power utilization device provided by the embodiment of the present application comprises the battery device 100 in the above embodiment, and the battery device 100 is used to provide electric energy.

[0117] The power utilization device provided by the embodiment of the present application comprises the battery device 100 in the above embodiment, and the battery device 100 is used to provide electric energy.

[0118] The power utilization device provided by the embodiment of the present application comprises the battery device 100 in the above embodiment, and the battery device 100 is used to provide electric energy.

[0119] The power utilization device provided by the embodiment of the present application comprises the battery device 100 in the above embodiment, and the battery device 100 is used to provide electric energy.

[0120] The battery device 100 provided by the embodiment of the present application comprises a battery monomer 11, a box 20 and a plurality of fasteners 23.

[0121] The box 20 comprises a first part 22 and a second part 21, the first part 22 and the second part 21 are installed in abutment and enclose a containing cavity for containing the battery monomer 11; a surface of the first part 22 facing the second part 21 is provided with an annular groove 220 surrounding the containing cavity, the annular groove 220 is used to contain sealing glue 221, and a surface of the second part 21 facing the first part 22 is provided with an annular protrusion 210 corresponding to the annular groove 220, the annular protrusion 210 is configured to at least partially insert the annular groove 220 and extrude the sealing glue 221 when the second part 21 and the first part 22 are installed in abutment.

[0122] The annular protrusion 210 comprises a plurality of protruding portions 2101 connected in series, the plurality of protruding portions 2101 are sequentially and spacedly arranged along a groove width direction of the annular groove 220, so that a recessed portion 2102 is formed between any adjacent two protruding portions 2101 in the plurality of protruding portions 2101. Along a groove depth direction of the annular groove 220, a recessed depth D1 of the recessed portion 2102 is less than a protruding height D2 of the protruding portion 2101. A cross-sectional shape of the annular groove 220 is the same as or similar to a cross-sectional shape of the annular protrusion 210, and a cross-sectional area of the annular groove 220 is greater than or equal to a cross-sectional area of the annular protrusion 210.

[0123] The first part 22 further comprises a glue overflow groove 222 adjacent to the annular groove 220 along a groove width direction of the annular groove 220, the glue overflow groove 222 is used to contain the sealing glue 221 overflowing from the annular groove 220. A groove depth D3 of the glue overflow groove 222 is less than a groove depth D4 of the annular groove 220. The glue overflow groove 222 is in communication with an opening side of the annular groove 220, and the glue overflow groove 222 and the annular groove 220 form a stepped structure.

[0124] A plurality of fasteners 23 connect the first part 22 and the second part 21. In a plane perpendicular to the first direction X, the orthographic projection of the fasteners 23 is located at the periphery of the orthographic projection of the annular groove 220. The first direction X is the height direction of the first part 22. The fasteners 23 are four, which are arranged at the four corners of the box 20, respectively.

[0125] The first part 22 includes a first end face 223 facing the second part 21, and the annular groove 220 is recessed relative to the first end face 223; the second part 21 includes a second end face 211 facing the first part 22, and the annular protrusion 210 is protruded relative to the second end face 211; the fastener 23 includes a pull rivet nut 231, which includes a mounting portion 2311 and a flange portion 2312 located at one end of the mounting portion 2311, and the mounting portion 2311 is inserted into the inside of the first part 22; a fastening bolt 232 is threaded through a mounting through hole provided in the second part 21 and connected with the mounting portion 2311, so that the flange portion 2312 is clamped between the first part 22 and the second part 21. The maximum dimension D3 of the annular protrusion 210 protruding relative to the second end face 211 satisfies: ; D0 is the maximum height of the flange portion 2312 in the direction perpendicular to the first end face 223, and D4 is the maximum depth of the annular groove 220 recessed relative to the first end face 223.

[0126] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include Battery cells, and The housing includes a first part and a second part, wherein the first part and the second part are mated and installed together to form a cavity for accommodating the battery cell; as well as Fasteners for connecting the first part and the second part; The first part has an annular groove surrounding the receiving cavity on its surface facing the second part. The annular groove is used to receive sealant. The second part has an annular protrusion corresponding to the annular groove on its surface facing the first part. The annular protrusion is configured to at least partially insert into the annular groove and compress the sealant when the second part is installed with the first part. The number of fasteners is multiple, and on a plane perpendicular to the first direction, the orthographic projection of the fastener is located outside the orthographic projection of the annular groove. The first direction is parallel to the groove depth direction of the annular groove.

2. The battery device according to claim 1, characterized in that, The annular protrusion includes a plurality of connected protrusions, which are arranged sequentially at intervals along the width direction of the annular groove, such that a recess is formed between any two adjacent protrusions.

3. The battery device according to claim 2, characterized in that, Along the groove depth direction of the annular groove, the recess depth D1 of the recessed portion is less than the protrusion height D2 of the protrusion.

4. The battery device according to any one of claims 1-3, characterized in that, The cross-sectional shape of the annular groove is the same as or similar to the cross-sectional shape of the annular protrusion, and the cross-sectional area of ​​the annular groove is greater than or equal to the cross-sectional area of ​​the annular protrusion.

5. The battery device according to any one of claims 1-3, characterized in that, The first part further includes an overflow groove adjacent to the annular groove along the groove width direction, the overflow groove being used to contain sealant overflowing from the annular groove.

6. The battery device according to claim 5, characterized in that, The depth D5 of the overflow groove is less than the depth D6 of the annular groove.

7. The battery device according to claim 6, characterized in that, The overflow groove is connected to the opening side of the annular groove, and the overflow groove and the annular groove form a stepped structure.

8. The battery device according to any one of claims 1-3, characterized in that, There are four fasteners, which are respectively arranged at the four corners of the box.

9. The battery device according to any one of claims 1-3, characterized in that, The fasteners include A rivet nut includes a mounting portion and a flange portion located at one end of the mounting portion, the mounting portion being inserted into the first portion; as well as Fastening bolts are inserted through mounting holes in the second part and connected to the mounting portion, such that the flange portion is sandwiched between the first part and the second part.

10. The battery device according to claim 9, characterized in that, The first portion includes a first end face facing the second portion, and the annular groove is recessed relative to the first end face; The second portion includes a second end face facing the first portion, and the annular protrusion protrudes relative to the second end face; the first end face and the second end face are configured to be spaced apart from each other when the first portion and the second portion are mated together, such that the flange portion of the rivet nut is located between the first end face and the second end face.

11. The battery device according to claim 10, characterized in that, The maximum dimension D3 of the annular protrusion relative to the second end face protrusion satisfies: ; Wherein, D0 is the maximum height of the flange portion along the direction perpendicular to the first end face, and D4 is the maximum depth of the annular groove recessed relative to the first end face.

12. The battery device according to any one of claims 1-3, characterized in that, The first portion includes a first end face facing the second portion, and the annular groove is recessed relative to the first end face; The second portion includes a second end face facing the first portion, and the annular protrusion protrudes relative to the second end face; The first end face and the second end face are configured to fit together when the first part and the second part are mated and installed.

13. A battery device according to claim 12, characterized in that, When the first part and the second part are connected by a rivet nut with a flange, at least one of the first end face and the second end face is provided with a countersunk hole for receiving the flange of the rivet nut.

14. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1-13, the battery device being used to provide electrical energy.

15. An energy storage device, characterized in that, The energy storage device includes a battery device as described in any one of claims 1-13, the battery device being used to store electrical energy.

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