Battery device, electric device and energy storage device

Abstract

The application provides a battery device, an electric device and an energy storage device, and belongs to the technical field of batteries. The battery device comprises a box body, a battery monomer and a sealing element. The box body comprises a first box body and a second box body, the first box body is connected with the second box body and forms an accommodating cavity, the first box body has a first cover surface, the second box body has a second cover surface, the first cover surface is buckled on the second cover surface, the battery monomer is accommodated in the accommodating cavity, the sealing element is arranged between the first cover surface and the second cover surface, one of the first cover surface and the second cover surface is provided with a groove, the other is provided with a convex rib, the convex rib is inserted into the groove, and part of the sealing element is pressed into the groove by the convex rib. The first box body comprises a cover plate and a side plate connected to the periphery of the cover plate, the side plate surrounds the outer periphery of the second box body, and part of the sealing element is pressed between the side plate and the second box body. Through the technical scheme, the number of parts for assembling the box body can be reduced, the assembly process is simplified, and the assembly efficiency of the product is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, electrical equipment, and energy storage device. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] In related technologies, the battery pack housing typically includes an upper cover and a lower housing. The upper cover and lower housing are usually connected by dozens of bolts to compress the seal between the upper cover and the lower housing, thereby achieving airtight protection. Due to the large number of bolts, the overall assembly efficiency is low. Utility Model Content

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery device, electrical appliance, and energy storage device to reduce the number of components in the battery device and improve the assembly efficiency of the battery device.

[0005] An embodiment of the first aspect of this application provides a battery device, comprising: a housing, including a first housing and a second housing, the first housing and the second housing being connected to form a receiving cavity, the first housing having a first cover surface, the second housing having a second cover surface, the first cover surface being fastened to the second cover surface; a battery cell, housed within the receiving cavity; and a sealing member, disposed between the first cover surface and the second cover surface, one of the first cover surface and the second cover surface having a groove, the other having a rib, the rib being inserted into the groove, and a portion of the sealing member being pressed into the groove by the rib; wherein, the first housing includes a cover plate and a side plate, the first cover surface being located on the side of the cover plate facing the second housing, the side plate being connected to the periphery of the cover plate and surrounding the outer periphery of the second housing, and a portion of the sealing member being pressed between the side plate and the second housing.

[0006] In the technical solution of this application embodiment, the first housing and the second housing are interlocked through a first mating surface and a second mating surface. Simultaneously, the interlocking structure of the protruding ribs and grooves enables rapid positioning and installation during the assembly of the first and second housings. Furthermore, the sealing element is arranged between the first and second housings. The protruding ribs, when inserted into the grooves, create a pressure limit on the sealing element, keeping it under pressure within the grooves. This eliminates the need for numerous bolts to compress the sealing element, reducing the number of fasteners required for housing assembly, simplifying the assembly process, and improving the overall assembly efficiency of the battery device. Simultaneously, the interlocking of the protruding ribs and grooves reduces the risk of lateral or angular misalignment between the first and second housings, improving the planar fit at the mating point of the first and second housings. This results in a more uniform pressure distribution on the sealing element, thereby enhancing the sealing effect at the mating point of the first and second housings. Furthermore, since the first housing includes a cover plate and side plates extending along the periphery of the cover plate, and the side plates are arranged around the outer periphery of the second housing, the side plates can form a surrounding and enclosing state of the second housing from the outside. The first mating surface is located on the side of the cover plate facing the second housing, which facilitates the alignment and fastening of the cover plate with the second mating surface of the second housing through the first mating surface. At the same time, some sealing elements are arranged and pressed between the side plates and the second housing, widening the range of sealing element placement, so that a sealing barrier can be formed at the mating gaps between the first housing and the second housing. The structural layout of the side plates surrounding the outside of the second housing can also provide lateral restraint to the first and second housings, improving the structural fit and overall regularity after they are fastened together.

[0007] In some embodiments, the seal includes a first sealing section, a second sealing section, and a third sealing section located within the groove. The first sealing section and the third sealing section are respectively pressed onto opposite sides of the rib parallel to the second mating surface, and the second sealing section is pressed onto the side of the rib facing the bottom wall of the groove.

[0008] When the rib is inserted into the groove to press the seal to achieve a seal, the first sealing section and the third sealing section are respectively pressed against the two sides of the rib in the direction parallel to the second mating surface, and the second sealing section is pressed against the side of the rib facing the bottom wall of the groove. This allows the part of the seal located in the groove to bear the extrusion force of the rib from different directions, so that multiple barrier seals are formed at the mating gap between the rib and the groove, thereby improving the sealing reliability of the seal and helping to improve the uniformity of the overall pressure on the seal.

[0009] In some embodiments, the inner wall of the groove is provided with a concave portion, and the rib includes a main body and a limiting protrusion disposed on the outer periphery of the main body. The limiting protrusion is disposed toward the concave portion, and a portion of the seal and at least a portion of the limiting protrusion are located within the concave portion.

[0010] After the limiting protrusion is embedded into the groove along with the rib, at least part of the limiting protrusion can extend into the concave portion and form a limiting stop relationship with the top of the concave portion, thereby reducing the risk of the rib dislodging from the groove and improving the structural stability after the first and second housings are closed. At the same time, part of the sealing element is pressed into the concave portion by the limiting protrusion, and the limiting protrusion can use the space of the concave portion to form a lateral limiting on the sealing element, so that the sealing element always maintains a stable pressure state.

[0011] In some embodiments, a buffer gap is provided on the end face of the rib facing the bottom wall of the groove.

[0012] By creating a buffer gap on the side of the rib facing the bottom wall of the groove, the buffer gap can provide a certain deformation allowance when the limiting rib is compressed. During the insertion of the rib into the groove, the limiting rib is compressed and can adaptively adjust its shape to match the assembly tolerance of the rib and the groove, so that at least part of the limiting rib can extend into the concave part.

[0013] In some embodiments, the recess extends circumferentially along the groove, and the number of limiting protrusions is at least two, with the at least two limiting protrusions being spaced apart circumferentially along the main body, and at least a portion of each limiting protrusion being located within the recess.

[0014] The concave portion extends circumferentially along the groove, forming a continuous limiting space circumferentially, facilitating circumferential engagement with the limiting protrusions. At least two limiting protrusions are spaced apart on the outer periphery of the rib, allowing for adaptive contraction and rebound when the rib is inserted into the groove, thanks to the deformation allowance provided by the buffer gap. This ensures that the at least two limiting protrusions smoothly enter the groove and extend into the concave portion. At least a portion of the structure of each limiting protrusion is located within the concave portion, enabling a double limiting engagement between the at least two limiting protrusions and the concave portion. This further enhances the connection stability between the rib and the groove, reducing the possibility of relative loosening or displacement of the first and second housings under vibration or external force.

[0015] In some embodiments, along a direction parallel to the second mating surface, the maximum size of the limiting protrusion is greater than the maximum size of the groove opening.

[0016] By setting the maximum dimension of the limiting protrusion in the direction parallel to the second mating surface to be greater than the maximum dimension of the groove opening, when the protrusion is inserted into the groove, the limiting protrusion can shrink and deform due to the buffer gap in the middle of the protrusion, so as to embed itself into the inside of the groove from the groove opening. After assembly, the limiting protrusion rebounds and gets stuck in the inner recess of the groove, forming a snap-fit ​​constraint. This increases the tightness of the connection between the protrusion and the groove, reduces the risk of the protrusion falling out of the groove, and also allows the seal to maintain a stable compression state, thereby improving the sealing effect of the seal.

[0017] In some embodiments, the side panel away from the cover plate is provided with a flange that protrudes toward the second housing and abuts against the second housing.

[0018] The flange formed by the side panel folding and extending towards the second housing can abut against the outer surface of the second housing after the first and second housings are interlocked, thus acting as a sealing element, reducing the risk of leakage of the seal, and can also assist the rib and groove in completing the positioning and insertion.

[0019] In some embodiments, one of the outer periphery and the flange of the second housing is provided with a positioning part, and the other is provided with a positioning groove. The positioning groove is adapted to the shape of the positioning part, and the positioning part is inserted into the positioning groove.

[0020] The outer periphery of the second housing is provided with a circumferentially extending positioning part, and the flange is provided with a positioning groove that matches the shape of the positioning part. Alternatively, the outer periphery of the second housing is provided with a positioning groove, and the flange is provided with a positioning part that matches the shape of the positioning groove. When the first housing and the second housing are assembled, the positioning part is inserted into the positioning groove to achieve the positioning connection between the first housing and the second housing. This can further improve the alignment accuracy during housing assembly, reduce the occurrence of offset or misalignment during assembly, and also improve the overall sealing performance of the housing after fastening.

[0021] In some embodiments, the surface of the positioning part is an arc-shaped curved surface.

[0022] By setting the positioning part as an arc-shaped surface, the arc-shaped surface can play a guiding and transitioning role during the process of the positioning part being inserted into the positioning groove, reducing the assembly friction resistance between the positioning part and the positioning groove wall, making it easier for the positioning part to slide smoothly into the positioning groove, reducing the alignment difficulty of the box assembly, and thus improving the assembly efficiency of the box.

[0023] In some embodiments, there are multiple ribs, which are spaced apart along the circumference of the first housing; there are multiple grooves, which extend along the circumference of the second housing, and the positions of the multiple grooves correspond one-to-one with the positions of the multiple ribs.

[0024] Multiple ribs are arranged at intervals along the circumference of the first housing, and multiple grooves correspond one-to-one with the multiple ribs along the circumference of the second housing. The multiple ribs and multiple grooves are respectively inserted and matched to form multiple positioning connection structures along the circumference of the housing, which makes the pressure on the sealing parts more even, and at the same time improves the overall structural connection strength of the housing circumference and reduces the impact of local stress deformation.

[0025] In some embodiments, the battery device further includes fasteners, a first housing having a first connection hole, a second housing having a second connection hole, and the fasteners passing through the first connection hole and the second connection hole in sequence to fix the first housing and the second housing together.

[0026] Based on the insertion of the ribs and grooves to press the seal, fasteners are used to achieve a fixed connection between the first and second housings. The insertion of the ribs and grooves achieves the sealing pressure effect on the seal, and the fasteners help to lock and fix the housing. There is no need to lay out a large number of fasteners. Only a small number of fasteners are needed to meet the connection and fixation requirements of the housing. While reducing the number of parts, the structural stability of the housing after assembly is also taken into account.

[0027] In some embodiments, the number of fasteners is multiple, and the multiple fasteners are arranged at intervals along the circumference of the housing.

[0028] Multiple fasteners are arranged at intervals along the circumference of the enclosure, forming a multi-point locking and fixing structure. Combined with the circumferentially distributed ribs and grooves, the tightness of the connection at various positions along the circumference of the enclosure tends to be consistent, reducing the risk of local loosening of the enclosure. This allows the seals to maintain a stable sealing condition for a long time and also improves the overall deformation resistance of the enclosure.

[0029] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0030] An embodiment of the third aspect of this application provides an energy storage device, which includes the battery device described in the above embodiments, the battery device being used to store electrical energy.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0033] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 This is an exploded view of the battery device according to some embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 4 This is an exploded structural diagram of the box body according to some embodiments of this application; Figure 5 This is a top view of the box structure according to some embodiments of this application; Figure 6 for Figure 5 A schematic diagram of a partial cross-sectional view along the AA direction; Figure 7 for Figure 6 A magnified structural diagram of section B.

[0034] Explanation of reference numerals in the attached figures: 1000, vehicles; 100. Battery assembly; 200. Controller; 300. Motor; 10. Housing; 11. First housing; 111. Cover plate; 1111. First mating surface; 112. Side plate; 113. Flanged edge; 1131. Positioning groove; 114. Rib; 1141. Main body; 1142. Limiting protrusion; 1143. Buffer gap; 12. Second housing; 121. Second mating surface; 122. Groove; 1221. Inner recess; 123. Positioning part; 13. Sealing element; 131. First sealing section; 132. Second sealing section; 133. Third sealing section; 14. Fastener; 20. Battery cell; 21. End cap; 211. Electrode terminal; 22. Housing; 23. Electrode assembly; 23a. Tab. Detailed Implementation

[0035] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0036] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0040] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0041] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0042] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0043] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0044] In related technologies, the battery pack housing typically includes an upper cover and a lower housing. The upper cover and lower housing are usually fastened together by bolts to apply pressure and compress sealing components such as foam, thereby achieving airtight protection between the upper cover and the lower housing. However, in order to ensure that the sealing components are subjected to uniform force, dozens of bolts are usually arranged at equal intervals for fastening, and additional components such as pressure strips are required. Moreover, the bolt fastening to provide pressure places high demands on the surface roughness and flatness of the upper cover and lower housing, making mold processing difficult, resulting in a large number of components. The assembly process of combining components is complicated, the assembly efficiency is low, and the production cost is high.

[0045] To address the problem of low assembly efficiency and high production costs caused by a large number of bolts during battery assembly, this application provides a battery device that uses a seal between a first and a second housing. The first housing has a first mating surface, and the second housing has a second mating surface. One of the first and second mating surfaces has a rib, and the other has a groove. The first and second housings are interlocked and connected. The rib is inserted into the groove, and part of the seal is pressed into the groove by the rib. In this way, the rib can press and limit the seal when it is inserted into the groove, keeping the seal under pressure inside the groove. This eliminates the need to rely on a large number of bolts to squeeze the seal and achieve a seal, thereby reducing the number of fasteners required for housing assembly, simplifying the housing assembly process, improving housing assembly efficiency, and reducing product production costs.

[0046] The battery device disclosed in this application can be used, but is not limited to, in electrical equipment or energy storage devices such as vehicles, ships, or aircraft. A power system for such electrical equipment or energy storage device can be constructed using the battery device disclosed in this application, thereby effectively improving the overall thermal insulation performance of the battery device and thus enhancing its performance.

[0047] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0048] This application also provides an energy storage device that uses a battery device as a power source. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0049] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0050] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0051] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0052] Please refer to Figures 2 to 7 , Figure 2 This is an exploded view of the battery device according to some embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 4 This is an exploded structural diagram of the box body according to some embodiments of this application; Figure 5 This is a top view of the box structure according to some embodiments of this application; Figure 6 for Figure 5 A schematic diagram of a partial cross-sectional view along the AA direction; Figure 7 for Figure 6An enlarged structural diagram of part B. This application provides a battery device 100, including: a housing 10, a battery cell 20, and a sealing member 13. The housing 10 includes a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are connected and form a receiving cavity. The first housing 11 has a first covering surface 1111, and the second housing 12 has a second covering surface 121. The first covering surface 1111 is fastened to the second covering surface 121. The battery cell 20 is housed within the receiving cavity. The sealing member 13 is disposed between the first covering surface 1111 and the second covering surface 121. One of the first covering surface 1111 and the second covering surface 121 has a groove 122, and the other has a rib 114. The rib 114 is inserted into the groove 122, and a portion of the sealing member 13 is pressed into the groove 122 by the rib 114. The first housing 11 includes a cover plate 111 and a side plate 112. The side plate 112 is connected to the periphery of the cover plate 111 and surrounds the outer periphery of the second housing 12. Part of the sealing element 13 is pressed between the side plate 112 and the second housing 12. The first mating surface 1111 is located on the side of the cover plate 111 facing the second housing 12.

[0053] The first box 11 and the second box 12 can both be hollow structures with an opening on one side. The opening side of the first box 11 covers the opening side of the second box 12, so that the first box 11 and the second box 12 together define a receiving cavity. The box 10 formed by the first box 11 and the second box 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0054] In some embodiments, the housing 10 may further include a top cover, a housing frame, and a bottom plate, with the top cover and bottom plate respectively connected to the housing frame, so that a closed receiving cavity is formed inside the housing 10 to accommodate the battery cells 20. As an example, the bottom plate may be a heat exchange plate.

[0055] As an example, the box body can be part of the chassis structure of the vehicle 1000. For example, the top cover of the box body can be at least part of the floor of the vehicle 1000, or the box body frame of the box body 10 can be at least part of the crossbeams and longitudinal beams of the vehicle 1000.

[0056] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within a casing. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within a casing. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0057] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0058] Please refer to Figure 3 The battery cell 20 refers to the smallest unit that makes up a battery. For example... Figure 3 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0059] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on end cap 21. Electrode terminals 211 can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. According to some embodiments of this application, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. According to some embodiments of this application, an insulating element may also be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components inside the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating element may be plastic, rubber, etc.

[0060] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The housing 22 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0061] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode plates without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals 211 to form a current loop.

[0062] Understandably, the first mating surface 1111 is located on the side of the first housing 11 facing the second housing 12, and is used to mate with the second mating surface 121. The second mating surface 121 is located on the side of the second housing 12 facing the first housing 11, and is used to engage with the first mating surface 1111.

[0063] The seal 13 is a flexible or elastic element that can be deformed under pressure, used to seal the gap between the first mating surface 1111 and the second mating surface 121.

[0064] As an example, the groove 122 is provided on the second mating surface 121, and the rib 114 is provided on the first mating surface 1111. Of course, the groove 122 can also be provided on the first mating surface 1111, and the rib 114 can be provided on the second mating surface 121.

[0065] As an example, the groove 122 can be an annular groove, a rectangular groove, etc. The rib 114 can be an annular rib 114, a rectangular rib 114, etc., that matches the shape of the groove 122.

[0066] As an example, the first housing 11 and the second housing 12 can be connected by means of snap-fit, bolt connection or riveting.

[0067] It is worth noting that the sealing structure of the rib 114 and the groove 122 pressing the seal 13 in this application can be used in any position or structural component in the battery device 100 that needs to be sealed. For example, it can be used for sealing between the top cover of the high voltage box and the box body.

[0068] As an example, the cover plate 111 is integrally connected to the side plate 112. The cover plate 111 is the main plate constituting the first housing 11. The side plate 112 is connected to the periphery of the cover plate 111 and extends in the direction of the second housing 12.

[0069] As an example, the cover plate 111 and the side plate 112 are arranged intersectingly; for example, the cover plate 111 and the side plate 112 can be arranged perpendicular to each other.

[0070] In some embodiments, the first housing 11 further includes a third mating surface, and the second housing 12 further includes a fourth mating surface. The first mating surface 1111 and the second mating surface 121 are fastened together along a first direction, and the third mating surface and the fourth mating surface are fastened together along a second direction. The first direction and the second direction are intersecting.

[0071] The first housing 11 and the second housing 12 are interlocked via the first mating surface 1111 and the second mating surface 121. Simultaneously, the interlocking structure of the protruding rib 114 and the groove 122 enables rapid positioning and installation during assembly. Furthermore, the sealing element 13 is positioned between the first housing 11 and the second housing 12. The protruding rib 114, when inserted into the groove 122, provides pressure and restraint to the sealing element 13, keeping it under pressure within the groove 122. This eliminates the need for numerous bolts to compress the sealing element 13, reducing the number of bolts and other fasteners required for housing assembly and simplifying the assembly process. This, in turn, improves the overall assembly efficiency of the battery device 100. Meanwhile, the insertion and engagement of the rib 114 and the groove 122 can reduce the risk of lateral or angular displacement between the first housing 11 and the second housing 12, thereby improving the planar fit at the junction of the first housing 11 and the second housing 12 and making the pressure distribution of the seal 13 more uniform, thus helping to improve the sealing effect of the seal 13 at the junction of the first housing 11 and the second housing 12. Furthermore, since the first housing 11 includes a cover plate 111 and a side plate 112 extending around the cover plate 111, and the side plate 112 is arranged around the outer periphery of the second housing 12, the side plate 112 can form a surrounding and enclosing state of the second housing 12 from the outside. The first mating surface 1111 is located on the side of the cover plate 111 facing the second housing 12, which facilitates the alignment and fastening of the cover plate 111 with the second mating surface 121 of the second housing 12 through the first mating surface 1111. At the same time, some sealing elements 13 are arranged and pressed between the side plate 112 and the second housing 12, widening the arrangement range of the sealing elements 13 and helping to further improve the sealing and protection effect. Moreover, the structural layout of the side plate 112 surrounding the outside of the second housing 12 can also form a lateral constraint on the first housing 11 and the second housing 12, improving the structural fit and overall regularity after the two are fastened together.

[0072] According to some embodiments of this application, the seal 13 includes a first sealing section 131, a second sealing section 132 and a third sealing section 133 located in the groove 122. The first sealing section 131 and the third sealing section 133 are respectively pressed on opposite sides of the rib 114 parallel to the second cover surface 121, and the second sealing section 132 is pressed on the side of the rib 114 facing the bottom wall of the groove 122.

[0073] Understandably, the first sealing section 131, the second sealing section 132, and the third sealing section 133 are connected and constitute part of the structure of the sealing element 13.

[0074] As an example, the first sealing section 131, the second sealing section 132, and the third sealing section 133 are integrally connected.

[0075] As an example, the plane containing the bottom wall of the groove 122 is parallel to the first mating surface 1111 and the second mating surface 121.

[0076] When the rib 114 is inserted into the groove 122 to press the seal 13 to achieve a seal, the first sealing section 131 and the third sealing section 133 are respectively pressed against the two sides of the rib 114 along the direction parallel to the second mating surface. The second sealing section 132 is pressed against the side of the rib 114 facing the bottom wall of the groove 122. This allows the part of the seal 13 located in the groove 122 to bear the extrusion force of the rib 114 from different directions, so that multiple barrier seals are formed at the mating gap between the rib 114 and the groove 122. This can improve the sealing reliability of the seal and help improve the uniformity of the overall pressure on the seal.

[0077] Please refer to Figure 7 According to some embodiments of this application, the inner sidewall of the groove 122 is provided with an inner recess 1221, and the rib 114 includes a main body 1141 and a limiting protrusion 1142 provided on the outer periphery of the main body 1141. The limiting protrusion 1142 is disposed toward the inner recess 1221, and a portion of the seal 13 and at least a portion of the limiting protrusion 1142 are located within the inner recess 1221.

[0078] As an example, the recess 1221 is a recessed structure located at the bottom of the groove 122 and formed by the inner sidewall of the groove 122 being recessed in a direction away from the rib 114.

[0079] Understandably, the limiting protrusion 1142 is a protruding structure provided on the outer periphery of the rib 114 and protruding in a direction away from the center of the rib 114, so that when the rib 114 is inserted into the groove 122, it is at least partially located in the concave portion 1221.

[0080] As an example, the limiting protrusion 1142 can be an elastic structure with elastic deformation capability, which can be compressed to undergo elastic deformation when the protrusion 114 is inserted into the groove 122, and can at least partially extend into the recess 1221 when the protrusion 114 is inserted into the groove 122.

[0081] The buffer gap 1143 provided in the middle of the rib 114 can provide a certain deformation allowance when the limiting protrusion 1142 is compressed. During the process of inserting the rib 114 into the groove 122, the limiting protrusion 1142 is compressed and can adaptively adjust its shape to adapt to the assembly tolerance of the rib 114 and the groove 122. After the limiting protrusion 1142 is inserted into the groove 122 along with the rib 114, at least part of the limiting protrusion 1142 can extend into the concave portion 1221 and form a limiting stop relationship with the top of the concave portion 1221 to reduce the risk of the rib 114 dislodging from the groove 122, thereby improving the structural stability after the first box 11 and the second box 12 are closed. Meanwhile, part of the seal 13 is pressed into the inner recess 1221 by the limiting protrusion 1142. The limiting protrusion 1142 can use the space of the inner recess 1221 to form a lateral limiting on the seal 13, so that the seal 13 always maintains a stable pressure state.

[0082] Please refer to Figure 7 A buffer gap 1143 is provided on the end face of the protruding rib 114 facing the bottom wall of the groove 122.

[0083] As an example, the buffer gap 1143 is a groove located in the middle of the rib 114 and extending through one end face of the rib 114 facing the bottom wall of the groove 122, which is used to provide a certain deformation allowance when the limiting protrusion 1142 is compressed.

[0084] By providing a buffer gap 1143 on the side of the rib 114 facing the bottom wall of the groove 122, the buffer gap 1143 can provide a certain deformation allowance when the limiting protrusion 1142 is compressed. During the process of inserting the rib 114 into the groove 122, the limiting protrusion 1142 is compressed and can adaptively adjust its shape to match the assembly tolerance of the rib 114 and the groove 122, so that at least part of the limiting protrusion 1142 can extend into the inner recess 1221.

[0085] Please refer to Figure 7 According to some embodiments of this application, the recess 1221 extends circumferentially along the groove 122, and the number of limiting protrusions 1142 is at least two. The at least two limiting protrusions 1142 are spaced apart circumferentially along the main body 1141, and at least a portion of each limiting protrusion 1142 is located within the recess 1221.

[0086] Understandably, there may be two, four or more limiting protrusions 1142. At least a portion of each limiting protrusion 1142 is located within the recess 1221, that is, the recess size of the recess 1221 can be adaptively adjusted, and each limiting protrusion 1142 may be partially or completely accommodated within the recess 1221.

[0087] The recessed portion 1221 extends circumferentially along the groove 122, forming a continuous limiting space circumferentially in the groove 122, facilitating circumferential engagement with the limiting protrusion 1142. At least two limiting protrusions 1142 are spaced circumferentially along the outer periphery of the rib 114. With the help of the deformation allowance provided by the buffer gap 1143, they adaptively contract and rebound when the rib 114 is inserted into the groove 122, allowing at least two limiting protrusions 1142 to smoothly enter the groove 122 and extend into the recessed portion 1221. At least a portion of the structure of each limiting protrusion 1142 is located within the recessed portion 1221, enabling at least two limiting protrusions 1142 to form a double limiting engagement with the recessed portion 1221. This helps to further improve the connection stability between the rib 114 and the groove 122, reducing the possibility of relative loosening or displacement of the first housing 11 and the second housing 12 under vibration or external force.

[0088] According to some embodiments of this application, along a direction parallel to the second mating surface 121, the maximum size of the rib 114 is greater than the size of the groove opening of the recess 122.

[0089] The maximum dimension of the rib 114 is the distance between the two limiting protrusions 1142 on opposite sides before the rib 114 is assembled with the groove 122.

[0090] By setting the maximum dimension of the rib 114 in the direction parallel to the second mating surface 121 to be larger than the size of the groove opening of the groove 122, when the rib 114 is inserted into the groove 122, the limiting protrusion 1142 can shrink and deform due to the buffer gap 1143 in the middle of the rib 114, so as to squeeze from the groove opening of the groove 122 into the interior of the groove 122. After assembly, the limiting protrusion 1142 rebounds and gets stuck in the inner recess 1221 of the groove 122, forming a snap-fit ​​constraint with the inner recess 1221. This increases the tightness of the connection between the rib 114 and the groove 122, reduces the risk of the rib 114 dislodging from the groove 122, and also allows the seal 13 to maintain a stable compression state, thereby improving the sealing effect of the seal 13.

[0091] Please refer to Figure 7 According to some embodiments of this application, the side plate 112 is provided with a flange 113 protruding towards the second housing 12 on the side away from the cover plate 111, and the flange 113 abuts against the second housing 12.

[0092] Understandably, the flange 113 is located on the side of the side plate 112 away from the cover plate 111 and is formed by folding it in the direction of the second box 12, and the flange 113 extends circumferentially along the side plate 112.

[0093] The flange 113 formed by the side plate 112 folding and extending towards the second housing 12 can abut against the outer surface of the second housing 12 after the first housing 11 and the second housing 12 are fastened together, thus playing the role of sealing the seal 13, reducing the risk of leakage of the seal 13, and can also assist the rib 114 and the groove 122 in completing the positioning and insertion.

[0094] Please refer to Figure 7 According to some embodiments of this application, one of the outer periphery and the flange of the second housing 12 is provided with a positioning part 123, and the other is provided with a positioning groove 1131. The positioning groove 1131 is adapted to the shape of the positioning part 123, and the positioning part 123 is inserted into the positioning groove 1131.

[0095] In this embodiment, the positioning part 123 may be provided on the outer periphery of the second housing 12, and the positioning groove 1131 may be provided on the side of the flange 113 facing the second housing 12. Alternatively, the positioning groove 1131 may be provided on the outer periphery of the second housing 12, and the positioning part 123 may be provided on the side of the flange 113 facing the second housing 12.

[0096] As an example, the positioning part 123 can be a positioning rib, which can be formed by a partial protrusion on the outer peripheral surface or the side of the flange facing the second housing 12. The positioning groove 1131 can be formed by a partial recess on the side of the flange 113 facing the second housing 12 or on the outer peripheral surface of the second housing 12. The positioning part 123 can be an arc-shaped protrusion, and the positioning groove 1131 can be an arc-shaped groove.

[0097] As an example, the positioning part 123 can be a continuous structure or an intermittent structure.

[0098] By providing a positioning part 123 on the outer periphery of the second housing 12 and providing a positioning groove 1131 on the flange 113 that matches the shape of the positioning part 123, or by providing a positioning groove 1131 on the outer periphery of the second housing 12 and providing a positioning part on the flange 113 that matches the shape of the positioning groove 1131, when the first housing 11 and the second housing 12 are assembled, the positioning part 123 can be inserted into the positioning groove 1131 to form a positioning connection between the first housing 11 and the second housing 12. This can further improve the alignment accuracy during housing assembly, reduce the occurrence of offset or misalignment during assembly, and also improve the overall sealing performance of the housing after fastening.

[0099] According to some embodiments of this application, the surface of the positioning part 123 is an arc-shaped curved surface.

[0100] As an example, the surface of the positioning part 123 can be elliptical or arc-shaped.

[0101] By setting the positioning part 123 as an arc-shaped surface, the arc-shaped surface can play a guiding transition role during the process of the positioning part 123 being inserted into the positioning groove 1131, reducing the assembly friction resistance between the positioning part 123 and the groove wall of the positioning groove 1131, making it easier for the positioning part 123 to slide smoothly into the positioning groove 1131, reducing the alignment difficulty of the box assembly, and thus improving the assembly efficiency of the box.

[0102] According to some embodiments of this application, there are multiple ribs 114, which are spaced apart along the circumference of the first housing 11; there are multiple grooves 122, which extend along the circumference of the second housing 12, and the positions of the multiple grooves 122 correspond one-to-one with the positions of the multiple ribs 114.

[0103] As an example, the box body is rectangular in shape. Both the first box body 11 and the second box body 12 have four sides, and at least two protruding ribs 114 are provided at the corresponding positions on each side. Correspondingly, each side of the second box body 12 is provided with at least two grooves 122.

[0104] Multiple ribs 114 are arranged at intervals along the circumference of the first housing 11, and multiple grooves 122 correspond one-to-one with the multiple ribs 114 along the circumference of the second housing 12. The multiple ribs 114 and multiple grooves 122 are respectively inserted and matched to form multiple positioning connection structures along the circumference of the housing, which makes the pressure on the sealing element 13 more balanced, and at the same time improves the overall structural connection strength of the housing in the circumference, and reduces the impact of local stress deformation.

[0105] Please refer to Figure 4 According to some embodiments of this application, the battery device 100 further includes a fastener 14. The first housing 11 is provided with a first connection hole, and the second housing 12 is provided with a second connection hole. The fastener 14 passes through the first connection hole and the second connection hole in sequence and fixes the first housing 11 and the second housing 12 together.

[0106] As an example, fastener 14 can be a bolt or screw. The fastener is positioned adjacent to the insertion connection between the rib 114 and the groove 122. For example, the fastener is located between the groove 122 and the receiving cavity, that is, the second connecting hole is located on the second mating surface 121 of the second housing 12 and between the groove 122 and the receiving cavity, and the positions of the first connecting hole and the second connecting hole correspond to each other.

[0107] Based on the insertion of the rib 114 and the groove 122 to press the sealing element 13, the fastener 14 is used to realize the fixed connection between the first box 11 and the second box 12. The insertion of the rib 114 and the groove 122 realizes the sealing pressure effect on the sealing element 13. The fastener assists in completing the locking and fixing of the box. There is no need to lay out a large number of fasteners. Only a small number of fasteners are needed to meet the connection and fixing requirements of the box. While reducing the amount of parts used, the structural stability of the box after assembly is also taken into account.

[0108] According to some embodiments of this application, there are multiple fasteners 14, and the multiple fasteners 14 are arranged at intervals along the circumference of the housing.

[0109] As an example, the box is rectangular, and the number of fasteners 14 is set to two or three along both the length and width directions of the box.

[0110] Multiple fasteners 14 are arranged at intervals along the circumference of the housing, which can form a multi-point locking and fixing structure in the circumference of the housing. Together with the circumferentially distributed ribs 114 and grooves 122, the tightness of the connection at each position in the circumference of the housing tends to be consistent, reducing the risk of local loosening of the housing, so that the seal 13 can maintain a stable sealing condition for a long time, and also improve the overall deformation resistance of the housing.

[0111] According to some embodiments of this application, the seal 13 includes foam or rubber.

[0112] As an example, the seal 13 can be a polyurethane foam layer, a polystyrene foam layer, a polypropylene foam layer, a rubber seal, etc.

[0113] Foam or rubber components are used as the sealing element 13. The foam or rubber components themselves have good elastic deformation ability, which can adapt to the slight flatness difference of the assembly and mating surfaces of the first protective component and the edge plate, and fit and fill the tiny gaps. At the same time, the foam or rubber components have good resistance to changes in environmental temperature, which can maintain a sealed fit for a long time, and meet the needs of the battery device 100 for long-term outdoor use and complex working conditions.

[0114] This application provides an electrical device that includes the battery device 100 described in the above embodiments, the battery device 100 being used to provide electrical energy.

[0115] The electrical device provided in this application includes the battery device 100 of any of the above embodiments, and therefore also has the technical effects of any of the above embodiments, which will not be repeated here.

[0116] This application provides an energy storage device, which includes the battery device 100 in the above embodiments, and the battery device 100 is used to store electrical energy.

[0117] The energy storage device provided in this application includes the battery device 100 of any of the above embodiments, and therefore also has the technical effects of any of the above embodiments, which will not be repeated here.

[0118] Please refer to Figures 2 to 7 According to some embodiments of this application, this application provides a battery device 100, including a housing, a battery cell 20, a seal 13, and a fastener 14. The housing includes a first housing 11 and a second housing 12, the first housing 11 and the second housing 12 being connected to form a receiving cavity. The first housing 11 has a first mating surface 1111, and the second housing 12 has a second mating surface 121. The first mating surface 1111 is fastened to the second mating surface 121. The battery cell 20 is housed within the receiving cavity. The seal 13 is disposed between the first mating surface 1111 and the second mating surface 121. One of the first mating surfaces 1111 and 121 has a groove 122, and the other has a rib 114. The rib 114 is inserted into the groove 122, and a portion of the seal 13 is pressed into the groove 122 by the rib 114. The first housing 11 has a first connecting hole, and the second housing 12 has a second connecting hole. Fasteners 14 pass through the first connecting hole and the second connecting hole in sequence to fix the first housing 11 and the second housing 12 together. The technical solution of this application can reduce the number of parts during housing assembly and improve the assembly efficiency of the housing.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The box includes a first box and a second box, the first box and the second box are connected to form a receiving cavity, the first box has a first closing surface, the second box has a second closing surface, and the first closing surface is fastened to the second closing surface; A single battery cell is housed within the receiving cavity; as well as A sealing element is disposed between the first mating surface and the second mating surface. One of the first mating surface and the second mating surface is provided with a groove, and the other is provided with a rib. The rib is inserted into the groove, and part of the sealing element is pressed into the groove by the rib. The first housing includes a cover plate and a side plate. The first mating surface is located on the side of the cover plate facing the second housing. The side plate is connected to the periphery of the cover plate and surrounds the outer periphery of the second housing. Part of the sealing element is pressed between the side plate and the second housing.

2. The battery device according to claim 1, characterized in that, The sealing element includes a first sealing section, a second sealing section, and a third sealing section located within the groove. The first sealing section and the third sealing section are respectively pressed onto opposite sides of the rib parallel to the second cover surface, and the second sealing section is pressed onto the side of the rib facing the bottom wall of the groove.

3. The battery device according to claim 1, characterized in that, The inner wall of the groove is provided with a concave portion, and the rib includes a main body and a limiting protrusion provided on the outer periphery of the main body. The limiting protrusion is disposed toward the concave portion, and a portion of the seal and at least a portion of the limiting protrusion are located inside the concave portion.

4. The battery device according to claim 3, characterized in that, A buffer gap is provided on the end face of the rib facing the bottom wall of the groove.

5. The battery device according to claim 4, characterized in that, The recessed portion extends circumferentially along the groove, and the number of the limiting protrusions is at least two. The at least two limiting protrusions are spaced apart circumferentially along the main body, and at least a portion of each limiting protrusion is located within the recessed portion.

6. The battery device according to claim 3, characterized in that, Along a direction parallel to the second mating surface, the maximum size of the rib is greater than the size of the groove opening.

7. The battery device according to claim 1, characterized in that, The side panel has a flange protruding towards the second housing on the side away from the cover plate, and the flange abuts against the second housing.

8. The battery device according to claim 7, characterized in that, The outer periphery of the second housing is provided with a positioning part, and the flange facing the second housing is provided with a positioning groove. The positioning groove is adapted to the shape of the positioning part, and the positioning part is inserted into the positioning groove.

9. The battery device according to claim 8, characterized in that, The surface of the positioning part is an arc-shaped curved surface.

10. The battery device according to any one of claims 1-6, characterized in that, The number of the protruding ribs is multiple, and the multiple protruding ribs are arranged at intervals along the circumference of the first box body; The number of grooves is multiple, and the multiple grooves extend along the circumference of the second box body, and the positions of the multiple grooves correspond one-to-one with the positions of the multiple ribs.

11. The battery device according to any one of claims 1-6, characterized in that, The battery device also includes fasteners. The first housing has a first connecting hole, and the second housing has a second connecting hole. The fasteners pass through the first connecting hole and the second connecting hole in sequence, and fix the first housing and the second housing together.

12. The battery device according to claim 11, characterized in that, The number of fasteners is multiple, and the multiple fasteners are arranged at intervals along the circumference of the housing.

13. The battery device according to any one of claims 1-6, characterized in that, The sealing element includes foam or rubber components.

14. An electrical appliance, characterized in that, The electrical equipment 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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