A battery box

Abstract

The utility model discloses a battery box, battery box includes box, box seal and lid. The top of box is continuously provided with the first annular edge in the circumference, and the first annular edge extends along the box, and the extension end of first annular edge is continuously provided with the second annular edge in the circumference, and the second annular edge extends along the vertical direction upwards. Box seal covers the first annular edge and the second annular edge of box along the vertical direction. The lid includes the cover plate and the lid bottom edge, and the lid bottom edge extends along the direction of box, and the cover plate is connected with the lid bottom edge. Along the vertical direction, the box seal is arranged between the lid bottom edge and the first annular edge, and the box seal is arranged between the cover plate and the second annular edge, and along the horizontal direction, the box seal is arranged between the lid bottom edge and the second annular edge. The utility model can form three sealing structures through the lid, the annular edge and the box seal, so as to realize triple physical isolation barrier, prevent liquid leakage, and the sealing structure will not be deformed when the lid is stressed.

Description

Technical Field

[0001] This utility model relates to the field of battery box technology, and in particular to a battery box. Background Technology

[0002] In recent years, driven by continuous technological advancements and increasing market acceptance, the research and application of electric vehicles have entered a phase of rapid development. Electric vehicles, powered by electricity, offer advantages such as wide availability and environmental friendliness, making them a crucial direction for the transformation and upgrading of the automotive industry. As the core energy storage component of electric vehicles, the sealing performance of the power battery pack is not only related to the safety of the entire vehicle but is also a key technical indicator for meeting national standard certifications.

[0003] Currently, most battery pack sealing structures on the market employ a single-layer thin-plate cover combined with bolts and a gasket for compression sealing. However, this structure has significant drawbacks. Due to the large area and thin thickness of the cover, it is prone to deformation during bolt tightening, leading to a decrease in the flatness of the contact surface between the cover and the gasket. This results in uneven pressure distribution, poor sealing performance, and a potential for leakage. Furthermore, the reliability of single-layer sealing structures is limited under extreme operating conditions; once the seal fails, it will directly affect the safety and lifespan of the battery pack. Utility Model Content

[0004] The purpose of this invention is to solve the problem that single-layer thin plate battery boxes often bend and deform due to insufficient rigidity during bolt tightening, leading to poor flatness of the sealing surface, uneven sealing pressure, and thus the risk of water leakage. This invention provides a battery box that forms a triple-seal structure through the box cover, the annular edge, and the box body seal, thereby achieving a triple physical barrier to prevent liquid leakage, and ensuring that the sealing structure does not deform when the box cover is subjected to force.

[0005] To solve the above-mentioned technical problems, the present invention discloses a battery box, which includes a box body, a box body seal, and a box cover; a first annular edge is continuously provided circumferentially on the top of the box body, the first annular edge extends along the body of the box body, and a second annular edge is continuously provided circumferentially at the extended end of the first annular edge, the second annular edge extending upward in the vertical direction; the box body seal covers the first and second annular edges of the box body in the vertical direction; the box cover includes a cover plate and a bottom edge of the box cover, the bottom edge of the box cover extends along the direction of the box body, and the cover plate is connected to the bottom edge of the box cover; in the vertical direction, a box body seal is provided between the bottom edge of the box cover and the first annular edge, and a box body seal is provided between the cover plate and the second annular edge; in the horizontal direction, the box body seal is provided between the bottom edge of the box cover and the second annular edge.

[0006] Using the above technical solution, when assembling the battery box, the bottom edge of the box cover presses the first sealing part of the box body seal against the first annular edge in the vertical direction to form a first sealing structure; the bottom edge of the box cover presses the second sealing part of the box body seal against the first extension section of the second annular edge in the horizontal direction to form a second sealing structure; and the cover plate of the box cover presses the sealing connection part of the box body seal against the connection section of the second annular edge in the vertical direction to form a third sealing structure. When the liquid inside the battery box sloshes, the first sealing structure primarily withstands the impact of the liquid, preventing direct leakage to the outside of the box through the tight fit of the bottom edge of the cover, the first sealing part, and the first annular edge. The second sealing structure, through the tight contact of the bottom edge of the cover, the second sealing part, and the first extension section, prevents droplets splashed onto the second annular edge due to liquid sloshing from leaking to the outside of the box through the connection between the first and second annular edges. The third sealing structure, through the tight fit of the cover plate, the sealing connection part, and the connection section, forms a sealing barrier at the cover plate, preventing liquid from leaking to the outside of the box from the cover plate due to violent shaking or even rolling of the battery box, thus bypassing the first two sealing structures. Simultaneously, the circumferential continuous frame structure formed by the connection between the bottom edge of the cover and the cover plate enhances the bending resistance of the cover. When the bolts tighten the cover and the box body, this frame structure can evenly distribute the pressure, avoiding warping or denting caused by localized stress concentration in existing thin-plate covers. This provides uniform compressive force to the three sealing structures, preventing leakage caused by uneven sealing pressure due to cover deformation.

[0007] According to another specific embodiment of the present invention, the second annular edge includes a first extension section, the first extension section extends upward in the vertical direction, and the extension end of the first annular edge is connected to the first extension section; in the horizontal direction, the first extension section is spaced apart from the bottom edge of the box cover, and the box body sealing member is provided between the bottom edge of the box cover and the first extension section.

[0008] By adopting the above technical solution, a second sealing structure is formed in the horizontal direction in the internal space of the box through the bottom edge of the box cover, the first extension section and the box body seal. When the internal liquid sloshes, this sealing surface can directly block the liquid from the inside, preventing the liquid from seeping outward along the connection between the first annular edge of the box body and the first extension section.

[0009] According to another specific embodiment of the present invention, the second annular edge further includes a second extension section and a connecting section. The connecting section is disposed between the extension end of the first extension section and the second extension section. The second extension section extends downward in the vertical direction. In the vertical direction, the connecting section is spaced apart from the cover plate, and a box sealing element is disposed between the cover plate and the connecting section.

[0010] By employing the above technical solution, a third sealing structure is formed vertically within the internal space of the housing through a cover plate, housing seals, and connecting sections. This allows splashed liquid to be blocked by the second extension section and the third sealing structure, thereby confining the liquid within the internal space of the housing. Simultaneously, the second extension section and connecting section are provided along the second annular edge, connecting the extended end of the first extension section to the second extension section via the connecting section. This increases the thickness of the second annular edge in the horizontal direction, thereby improving its resistance to deformation in the vertical direction.

[0011] According to another specific embodiment of the present invention, the housing seal includes a first sealing part, a second sealing part, a third sealing part, and a sealing connection part. The first sealing part covers a first annular edge in a vertical direction, the second sealing part covers a first extension section in a vertical direction, the sealing connection part covers a connection section in a vertical direction, and the third sealing part covers a second extension section in a vertical direction. One end of the first sealing part is connected to one end of the second sealing part, the other end of the second sealing part is connected to one end of the sealing connection part, and the other end of the sealing connection part is connected to one end of the third sealing part.

[0012] By adopting the above technical solution, the box seal is formed into a complete box seal by setting a first sealing part, a second sealing part, a third sealing part and a sealing connection part. This structural design allows the box seal to be in close contact with the first annular edge and the second annular edge in different directions, so that the box seal can provide a barrier when the liquid inside the box impacts from different directions.

[0013] According to another specific embodiment of this utility model, in the vertical direction, the bottom edge of the box cover and the first annular edge are spaced apart, and a first sealing part is provided between the bottom edge of the box cover and the first annular edge; the cover plate and the connecting section are spaced apart, and a sealing connection part is provided between the cover plate and the connecting section; in the horizontal direction, the bottom edge of the box cover and the first extension section are spaced apart, and a second sealing part is provided between the bottom edge of the box cover and the first extension section; the first extension section and the third sealing part are spaced apart, and a second extension section is provided between the first extension section and the third sealing part.

[0014] By adopting the above technical solution, three interval spaces are clearly defined by setting the vertical interval between the bottom edge of the box cover and the first annular edge, the horizontal interval between the bottom edge of the box cover and the first extension section, and the vertical interval between the cover plate and the connecting section. These interval spaces respectively accommodate different parts of the box body seal, so that each sealing part can be compressed in its own space to form three sealing interfaces in different directions.

[0015] According to another specific embodiment of the present invention, the thickness of the first annular edge is between 1 and 1.5 mm, the thickness of the second annular edge is between 1 and 1.5 mm, the thickness of the box seal is between 3 and 5 mm, and the thickness of the box cover is between 0.8 and 1.2 mm.

[0016] The above technical solution sets the thickness of the first and second annular edges to 1-1.5mm to ensure they can resist deformation when tightened by bolts. If the thickness is less than 1-1.5mm, the box structure is prone to deformation under bolt tightening force, resulting in uneven surfaces on the annular edges and easy damage. If the thickness is greater than 1-1.5mm, it will increase the overall weight of the box, thus increasing material costs. The lid thickness is set to 0.8-1.2mm to ensure the continuous structure composed of the lid plate, bottom edge, and side edge has bending strength. If the thickness is less than 0.8-1.2mm, the lid will have obvious dents at the bolt installation points, compromising its flatness. If the thickness is greater than 0.8-1.2mm, it will increase material costs and hinder weight reduction. Setting the thickness range of the enclosure seal to 3-5mm ensures that it can elastically deform when pressed by the enclosure lid, thus achieving an effective seal. If the thickness is less than 3-5mm, the seal's compression ratio will be insufficient, leading to a poor seal and potential liquid leakage. If the thickness is greater than 3-5mm, it will cause assembly difficulties and increase material costs. This combination of three thickness ranges optimizes weight and cost while ensuring the structural functionality of each component.

[0017] According to another specific embodiment of the present invention, the battery box further includes bolts and nuts, wherein the first annular side is provided with at least one annular hole, the first sealing part is provided with at least one sealing hole, the bottom edge of the box cover is provided with at least one bottom edge hole, and the cover plate is provided with at least one cover plate hole. The annular hole, sealing hole, bottom edge hole and cover plate hole are coaxially arranged in the vertical direction. The nut is provided on the lower side of the first annular side in the vertical direction. The threaded rod of the bolt passes through the cover plate hole, bottom edge hole, sealing hole and annular hole in the vertical direction and is detachably connected to the nut.

[0018] By adopting the above technical solution, the annular hole, sealing hole, bottom edge hole and cover plate hole are set coaxially in the vertical direction, ensuring that the threaded rod of the bolt can penetrate all components vertically, thereby realizing the alignment and synchronous pressing of the cover, the box body seal and the box body. This connection method avoids the local stress generated in the box body seal due to hole position deviation during the assembly process, and ensures that the box body seal can deform evenly during the compression process.

[0019] According to another specific embodiment of the present invention, the diameter of the annular hole, the sealing hole, the bottom edge hole and the cover plate hole is 0.5 mm to 1 mm larger than the diameter of the bolt thread rod.

[0020] Using the above technical solution, the diameters of the annular hole, sealing hole, bottom edge hole, and cover plate hole are set to be 0.5mm to 1mm larger than the diameter of the bolt thread shank. This ensures that the thread shank can pass through all holes, preventing scratches or deformation of components due to forced assembly. Simultaneously, this clearance ensures that the torque during bolt tightening is converted into vertical compressive force on the housing seals, resulting in a more uniform pressure distribution on the housing seals.

[0021] According to another specific embodiment of the present invention, the bolt includes a bolt sealing ring and a washer; in the vertical direction, the threaded shank of the bolt passes through the bolt sealing ring and the washer, the bolt sealing ring is located between the head of the bolt and the cover plate, and the washer is located between the head of the bolt and the bolt sealing ring.

[0022] Using the above technical solution, the bolt sealing ring tightly fills the gap between the bolt head and the cover plate under the pressure of the bolt head, preventing external liquids from seeping into the housing along the bolt thread. Simultaneously, a gasket is placed between the bolt head and the bolt sealing ring, dispersing the bolt tightening force through a larger bearing area, preventing excessive local pressure on the bolt sealing ring and potential rupture. The combined use of the bolt sealing ring and gasket ensures a seal between the bolt and the cover plate, while also converting the bolt tightening torque into stable and uniform compression of the bolt sealing ring, improving the sealing durability between the bolt and the cover plate.

[0023] According to another specific embodiment of the present invention, the box cover further includes a box cover side edge, which is continuously arranged circumferentially along the edge of the cover plate, and the box cover side edge is located vertically between the edge of the cover plate and the bottom edge of the box cover.

[0024] Using the above technical solution, the side edge of the lid is continuously arranged circumferentially along the edge of the cover plate and vertically connects the cover plate to the bottom edge of the lid. The bottom edge of the lid is in close contact with the second annular edge, forming a closed annular structure around the lid. This structure enhances the overall rigidity and bending resistance of the lid's edge area, preventing localized deformation during bolt tightening. When bolts apply clamping force, the side edge prevents the bottom edge of the lid from warping or denting, ensuring that the pressure exerted by the bottom edge of the lid on the lid seal is evenly distributed across the entire lid seal. Attached Figure Description

[0025] Figure 1 This diagram shows a schematic representation of the battery box in an embodiment of the present invention.

[0026] Figure 2 A front view of the battery box in an embodiment of this utility model is shown;

[0027] Figure 3 An exploded view of the battery box in an embodiment of this utility model is shown;

[0028] Figure 4 A cross-sectional view of the battery box in this utility model is shown;

[0029] Figure 5 This diagram shows the structural schematic of the housing in this utility model;

[0030] Figure 6 This invention shows a front view of the housing.

[0031] Figure 7 This diagram shows the structural schematic of the housing seal in this utility model;

[0032] Figure 8 This is a front view of the housing seal in this utility model;

[0033] Figure 9 This diagram shows the structural schematic of the box cover of this utility model;

[0034] Figure 10 A top view of the box cover of this utility model is shown;

[0035] Figure 11 The bottom view of the box cover of this utility model is shown;

[0036] Figure 12 The front view of the box cover of this utility model is shown;

[0037] Figure 13 The diagram shows the structure of the bolt and nut in this utility model.

[0038] Icons: 1-Battery box; 10-Box body; 11-Top of box body; 12-First annular edge; 13-Extension of the first annular edge; 14-Second annular edge; 15-First extension segment; 16-Extension of the first extension segment; 17-Connecting segment; 18-Second extension segment; 19-Annular hole;

[0039] 20 - Housing seal; 21 - First sealing part; 22 - Second sealing part; 23 - Sealing connection part; 24 - Third sealing part; 25 - Sealing hole;

[0040] 30 - Lid; 31 - Cover plate; 32 - Edge of cover plate; 33 - Side of lid; 34 - Bottom edge of lid; 35 - Hole in cover plate; 36 - Hole in bottom edge;

[0041] 40 - Bolt; 41 - Bolt head; 42 - Bolt threaded shank; 43 - Washer; 44 - Bolt sealing ring; 45 - Nut;

[0042] 50 - First sealing structure; 51 - Second sealing structure; 52 - Third sealing structure. Detailed Implementation

[0043] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0044] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0046] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0047] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0048] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0049] refer to Figures 1 to 4 This application provides a battery box 1, including a box body 10, a box body seal 20, and a box cover 30. The top 11 of the box body has a first annular edge 12 continuously arranged circumferentially, extending inside the box body 10. The extended end 13 of the first annular edge has a second annular edge 14 continuously arranged circumferentially, extending vertically upwards. The box body seal 20 vertically covers the first annular edge 12 and the second annular edge 14 of the box body 10. The box cover 30 includes a cover plate 31 and a bottom edge 34, extending along the direction of the box body 10, and the cover plate 31 is connected to the bottom edge 34. Vertically, the box body seal 20 is disposed between the bottom edge 34 and the first annular edge 12, and between the cover plate 31 and the second annular edge 14. Horizontally, the box body seal 20 is disposed between the bottom edge 34 and the second annular edge 14.

[0050] refer to Figure 3 and Figure 4This application mainly provides a battery box with three sealing structures. The bottom edge 34 of the box cover presses the first sealing part 21 of the box body seal 20 vertically downward onto the first annular edge 12 to form a first sealing structure 50. The bottom edge 34 of the box cover presses the second sealing part 22 of the box body seal 20 horizontally onto the first extension section 15 of the second annular edge 14 to form a second sealing structure 51. The cover plate 31 of the box cover 30 presses the sealing connection part 23 of the box body seal 20 vertically downward onto the connection section 17 of the second annular edge 14 to form a third sealing structure 52. When the liquid inside the battery box 1 shakes, the first sealing structure 50 mainly bears the impact of the liquid and prevents the liquid from leaking directly to the outside of the box body 10 through the tight fit of the bottom edge 34 of the box cover, the first sealing part 21 and the first annular edge 12; the second sealing structure 51, through the tight contact of the bottom edge 34 of the box cover, the second sealing part 22 and the first extension section 15, prevents the droplets splashed to the second annular edge 14 due to the shaking of the liquid from leaking to the outside of the box body 10 through the connection between the first annular edge 12 and the second annular edge 14; the third sealing structure 52, through the tight fit of the cover plate 31, the sealing connection part 23 and the connecting section 17, forms a sealing barrier between the cover plate 31 and the connecting section 17 to prevent the liquid from leaking to the outside of the box body 10 from the contact surface between the cover plate 31 and the connecting section 17 due to the violent shaking of the battery box 1. Meanwhile, the circumferential continuous frame structure formed by the connection between the bottom edge 34 of the cover and the cover plate 31 enhances the bending resistance of the cover 30. When the bolts 40 tighten the cover 30 and the box body 10, this frame structure can evenly distribute the pressure, preventing the cover 30 from warping or denting due to local stress concentration, providing uniform compression force for the three-seal structure, and preventing leakage caused by uneven sealing pressure due to deformation of the cover 30.

[0051] For example, the second annular edge 14 includes a first extension 15. (See reference...) Figures 4 to 6 The first extension segment 15 extends vertically upwards, and the extension end 13 of the first annular edge 12 connects to the first extension segment 15. Horizontally, the first extension segment 15 is spaced apart from the bottom edge 34 of the lid, and a box seal 20 is provided between the bottom edge 34 and the first extension segment 15. The horizontally spaced first extension segment 15 and bottom edge 34 form a space between them to accommodate and compress the second sealing portion 22 of the box seal 20. When the lid 30 is pressed and tightened, the bottom edge 34 presses the second sealing portion 22 in this space horizontally, causing the second sealing portion 22 to fit tightly against the first extension segment 15. This arrangement ensures that the bottom edge 34, the second sealing portion 22, and the first extension segment 15 are in close contact horizontally, preventing liquid from seeping outwards along the connection between the extension end 13 of the first annular edge 12 and the first extension segment 15.

[0052] Furthermore, the second annular edge 14 also includes a second extension segment 18 and a connecting segment 17. (See reference) Figures 4 to 6 A connecting section 17 is disposed between the extension end 16 of the first extension section and the second extension section 18, which extends downward in the vertical direction. The connecting section 17 and the cover plate 31 are spaced apart in the vertical direction, and a housing seal 20 is disposed between the cover plate 31 and the connecting section 17. The first extension section 15 and the second extension section 18 fit tightly together, increasing the thickness of the second annular edge 14 in the horizontal direction. The inverted "U"-shaped structure formed by the first extension section 15, the connecting section 17, and the second extension section 18 provides a stable pressing plane for the cover plate 31 extending upward in the vertical direction. When the second annular edge is subjected to downward pressure from the cover plate 31, the connecting section 17 decomposes and transmits the pressure to the first extension section 15 and the second extension section 18, thereby improving the deformation resistance of the second annular edge in the vertical direction. At the same time, the cover plate 31 presses down on the sealing connection part 23 of the box seal 20 to form a third sealing structure 52 on the connecting section 17, so that the splashed liquid is blocked by the second extension section 18 and the third sealing structure 52, thereby restricting the liquid in the internal space of the box 10.

[0053] In some possible embodiments, the housing seal 20 includes a first sealing portion 21, a second sealing portion 22, a third sealing portion 24, and a sealing connection portion 23. (See reference) Figure 7 and Figure 8The first sealing part 21 vertically covers the first annular edge 12, the second sealing part 22 vertically covers the first extension section 15, the sealing connection part 23 vertically covers the connection section 17, and the third sealing part 24 vertically covers the second extension section 18. One end of the first sealing part 21 is connected to one end of the second sealing part 22, the other end of the second sealing part 22 is connected to one end of the sealing connection part 23, and the other end of the sealing connection part 23 is connected to one end of the third sealing part 24. The first sealing part 21 vertically covers the first annular edge 12. When the bottom edge 34 of the lid is pressed vertically, the bottom edge 34 of the lid, the first sealing part 21, and the first annular edge 12 form a first sealing structure 50, preventing liquid leakage in the horizontal direction. The second sealing part 22 vertically covers the first extension section 15. When the bottom edge 34 of the lid is pressed horizontally, the bottom edge 34 of the lid, the second sealing part 22, and the first extension section 15 form a second sealing structure 51, preventing liquid leakage in the vertical direction. The sealing connection part 23 vertically covers the connection section 17. When the cover plate 31 is pressed downward, a third sealing structure 52 is formed on the upper surface of the connection section 17, preventing leakage from the contact surface between the cover plate 31 and the connection section 17. The third sealing part 24 vertically covers the second extension section 18, and together with the second sealing part 22, forms a double sealing protection for the second annular edge 14. With this configuration, the housing seal 20 forms a complete housing seal 20 by providing a first sealing part 21, a second sealing part 22, a third sealing part 24 and a sealing connection part 23. This structural design allows the housing seal 20 to be in close contact with the first annular edge 12 and the second annular edge 14 in different directions, so that the housing seal 20 can provide a barrier when the liquid inside the housing 10 impacts from different directions.

[0054] Furthermore, vertically, the bottom edge 34 of the lid is spaced apart from the first annular edge 12, and a first sealing part 21 is provided between the bottom edge 34 of the lid and the first annular edge 12. The cover plate 31 is spaced apart from the connecting section 17, and a sealing connection part 23 is provided between the cover plate 31 and the connecting section 17. Horizontally, the bottom edge 34 of the lid is spaced apart from the first extension section 15, a second sealing part 22 is provided between the bottom edge 34 of the lid and the first extension section 15, a first extension section 15 is spaced apart from the third sealing part 24, and a second extension section 18 is provided between the first extension section 15 and the third sealing part 24. This arrangement, by defining the vertical interval between the bottom edge 34 of the lid and the first annular edge 12, the horizontal interval between the bottom edge 34 of the lid and the first extension section 15, and the vertical interval between the cover plate 31 and the connecting section 17, clearly defines three interval spaces. These interval spaces respectively accommodate different parts of the box seal 20, so that each sealing part can be compressed in its own space, forming a sealing structure in three different directions.

[0055] In some possible implementations, the thickness of the first annular edge 12 is between 1 and 1.5 mm, and the thickness of the second annular edge 14 is also between 1 and 1.5 mm, to ensure that the first annular edge 12 and the second annular edge 14 can resist deformation when tightened by bolts. The thickness of the housing seal 20 is between 3 and 5 mm, to ensure that the housing seal 20 can generate sufficient elastic deformation when pressed by the housing cover 30, thereby achieving an effective seal. The thickness of the housing cover 30 is between 0.8 and 1.2 mm, to ensure that the continuous structure composed of the cover plate 31, the bottom edge 34 of the housing cover, and the side edge 33 of the housing cover has bending strength. It should be noted that the thickness of the first extension section 15 is between 1 and 1.5 mm, the thickness of the connecting section 17 is between 1 and 1.5 mm, the thickness of the second extension section 18 is between 1 and 1.5 mm, the thickness of the first sealing part 21 is between 3 and 5 mm, the thickness of the second sealing part 22 is between 3 and 5 mm, the thickness of the sealing connecting part 23 is between 3 and 5 mm, the thickness of the third sealing part 24 is between 3 and 5 mm, the thickness of the cover plate 31 is between 0.8 and 1.2 mm, the thickness of the side edge of the box cover 33 is between 0.8 and 1.2 mm, and the thickness of the bottom edge of the box cover 34 is between 0.8 and 1.2 mm.

[0056] For example, when the thicknesses of the first annular edge 12, the first extension 15, the connecting section 17, and the second extension 18 are selected as 1mm, 1.2mm, 1.4mm, and 1.5mm respectively, the first annular edge 12 and the second annular edge 14 have bending stiffness and can effectively resist deformation when the bolts 40 are tightened, maintaining the flatness of the first annular edge 12 and the second annular edge. However, when 0.7mm and 0.9mm are selected, the box structure is prone to deformation under the action of bolt tightening force, resulting in uneven surfaces of the first annular edge 12 and the second annular edge 14, which are prone to damage. When 1.6mm and 1.8mm are selected, although the first annular edge 12 and the second annular edge 14 have higher strength, the increased material usage leads to an increase in the overall weight of the box 10, increasing material costs and hindering the lightweight design of the battery box 1.

[0057] When the thicknesses of the first sealing part 21, the second sealing part 22, the sealing connection part 23, and the third sealing part 24 are selected as 3mm, 3.2mm, 3.4mm, 3.7mm, 4.0mm, 4.3mm, 4.5mm, 4.8mm, and 5.0mm respectively, the box sealing component 20 can undergo elastic deformation when the box cover 30 is pressed, fully filling the assembly gap between the bottom edge 34 of the box cover and the first annular edge 12 and the first extension section 15, forming a complete sealing area, while avoiding excessive pressure on the box cover 30. However, when 2.7mm and 2.9mm are selected, the material volume of the box sealing component 20 is insufficient, making it difficult to fill the gaps between the sealing areas under the same pressing conditions, which may lead to local poor sealing and affect the overall sealing effect. When 5.1mm and 5.3mm are selected, not only is the assembly difficulty increased, but it may also cause local deformation of the box cover 30 or the box body 10.

[0058] For the cover plate 31, the side edge 33 of the cover, and the bottom edge 34 of the cover, the selected thicknesses of 0.8mm, 0.9mm, 1.1mm, and 1.2mm respectively can effectively resist bending deformation when the bolts 40 are tightened. However, when 0.5mm and 0.7mm are selected, the cover plate 31 will have a significant indentation at the bolt 40 installation point, which will affect the flatness of the cover. When 1.3mm and 1.5mm are selected, although the strength of the cover 30 is improved, the amount of material used is increased, resulting in an increase in the overall weight of the cover 30, which increases the material cost and is not conducive to the lightweight design of the battery box 1. The combination of these three thickness ranges achieves the optimization of weight and cost while ensuring the structural function of each component.

[0059] In some possible implementations, refer to Figures 3 to 13The battery box 1 also includes bolts 40 and nuts 45. The first annular edge 12 is provided with at least one annular hole 19, the first sealing part 21 is provided with at least one sealing hole 25, the bottom edge 34 of the box cover is provided with at least one bottom edge hole 36, and the cover plate 31 is provided with at least one cover plate hole 35. The annular hole 19, the sealing hole 25, the bottom edge hole 36 and the cover plate hole 35 are coaxially arranged in the vertical direction. The nut is provided on the lower side of the first annular edge 12 in the vertical direction. The threaded rod 42 of the bolt passes through the cover plate hole 35, the bottom edge hole 36, the sealing hole 25 and the annular hole 19 in the vertical direction and is detachably connected to the nut 45. This configuration, by coaxially aligning the annular hole 19, sealing hole 25, bottom edge hole 36, and cover plate hole 35 in the vertical direction, ensures that the threaded rod 42 can vertically penetrate all components. This achieves alignment and synchronous clamping of the cover 30, the box seal 20, and the box body 10. This connection method avoids localized stress in the box seal 20 caused by hole misalignment during assembly, ensuring uniform deformation of the box seal 20 during compression. Simultaneously, the nut 45, located below the first annular edge 12, cooperates with the bolt 40 above, converting the tightening torque into a vertically downward clamping force. This clamping force is evenly transmitted to the box seal 20 through the cover plate 31 and the bottom edge 34 of the cover, causing simultaneous compression on the first annular edge 12, the first extension section 15, and the connecting section 17. This synchronously forms the first sealing structure 50, the second sealing structure 51, and the third sealing structure 52. This clamping method ensures pressure balance between the sealing structures, preventing seal failure due to uneven local pressure.

[0060] It should be noted that the nut 45 in this embodiment can be a blind hole rivet nut or the like, and no specific limitation is made here.

[0061] It should be noted that in this embodiment, there are 14 annular holes 19, 14 sealing holes 25, 14 bottom edge holes 36, and 14 cover plate holes 35, which are not specifically limited here.

[0062] Furthermore, the diameters of the annular hole 19, the sealing hole 25, the bottom edge hole 36, and the cover plate hole 35 are 0.5 mm to 1 mm larger than the diameter of the threaded rod 42 of the bolt. For example, in this embodiment, the threaded rod diameter of the bolt 40 is 16mm. For the annular hole 19, the sealing hole 25, the bottom edge hole 36, and the cover plate hole 35, the selected hole diameters are 16.5mm, 16.7mm, 16.9mm, and 17mm, respectively. This setting provides installation space for the bolt 40 to pass through the multi-layer structure, ensuring that the bolt 40 can pass smoothly through all holes without friction or interference with the hole walls during assembly. However, when 16.2mm and 16.4mm are selected, the space between the hole diameter and the threaded rod 42 is too limited, and the threaded rod 42 is prone to contact with the hole wall, generating frictional resistance and increasing the assembly difficulty. When 17.1mm and 17.3mm are selected, the space between the hole diameter and the threaded rod 42 is too large, which may cause relative displacement between the cover 30, the box seal 20, and the box 10 during the tightening process, resulting in uneven pressure distribution of the sealing structure and easy leakage of liquid.

[0063] In some possible implementations, bolt 40 includes a bolt sealing ring 44 and a washer 43. (See reference) Figure 13 Vertically, the bolt thread 42 passes through the bolt sealing ring 44 and the washer 43. The bolt sealing ring 44 is located between the head 41 of the bolt 40 and the cover plate 31, and the washer 43 is located between the head 41 of the bolt and the bolt sealing ring 44. This arrangement ensures that the bolt sealing ring 44, under the pressure of the head 41 of the bolt 40, tightly fills the gap between the head 41 of the bolt 40 and the cover plate 31, preventing external liquids from seeping into the housing along the bolt thread 42. Simultaneously, the washer 43, positioned between the head 41 of the bolt 40 and the bolt sealing ring 44, disperses the tightening force of the bolt 40 through a larger bearing area, preventing excessive local pressure on the bolt sealing ring 44 and potential rupture. The combined use of the bolt sealing ring 44 and the washer 43 ensures a seal between the bolt 40 and the cover plate 31, while also converting the tightening torque of the bolt 40 into stable and uniform compression of the bolt sealing ring 44, thus improving the sealing durability between the bolt 40 and the cover plate 31.

[0064] In some possible implementations, refer to Figures 9 to 12The lid 30 also includes a lid side 33, which is continuously arranged circumferentially along the edge of the cover plate 31. The lid side 33 is located vertically between the edge 32 of the cover plate and the bottom edge 34 of the lid. This arrangement, with the lid side 33 continuously arranged circumferentially along the edge 32 of the cover plate and vertically connecting the cover plate 31 and the bottom edge 34, creates a closed annular structure around the lid 30 by ensuring close contact between the bottom edge 34 and the second annular edge 14. This structure enhances the overall rigidity and bending resistance of the lid 30's edge area, preventing localized deformation when the bolts 40 are tightened. When the bolts 40 apply pressure, the lid side 33 prevents the bottom edge 34 from warping or denting, ensuring that the pressure exerted by the bottom edge 34 on the lid seal 20 is evenly distributed across the entire lid seal 20.

[0065] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery box, characterized in that: The battery box includes a box body, a box body seal, and a box cover; The top of the box is continuously provided with a first annular edge, which extends along the inside of the box. The extended end of the first annular edge is continuously provided with a second annular edge, which extends upward in the vertical direction. The enclosure seal covers the first and second annular edges of the enclosure in the vertical direction. The lid includes a cover plate and a bottom edge of the lid, the bottom edge of the lid extends along the direction of the box body, and the cover plate is connected to the bottom edge of the lid; A box body seal is provided between the bottom edge of the box cover and the first annular edge in the vertical direction, and a box body seal is provided between the cover plate and the second annular edge. The box body seal is provided between the bottom edge of the box cover and the second annular edge in the horizontal direction.

2. The battery box as described in claim 1, characterized in that, The second annular edge includes a first extension segment, which extends upward in a vertical direction, and the extension end of the first annular edge is connected to the first extension segment; in a horizontal direction, the first extension segment is spaced apart from the bottom edge of the box cover, and the box body sealing element is provided between the bottom edge of the box cover and the first extension segment.

3. The battery box as described in claim 2, characterized in that, The second annular edge also includes a second extension section and a connecting section. The connecting section is disposed between the extension end of the first extension section and the second extension section. The second extension section extends downward in the vertical direction. In the vertical direction, the connecting section is spaced apart from the cover plate, and a box seal is disposed between the cover plate and the connecting section.

4. The battery box as described in claim 3, characterized in that, The housing seal includes a first sealing part, a second sealing part, a third sealing part, and a sealing connection part. The first sealing part covers a first annular edge in a vertical direction, the second sealing part covers a first extension section in a vertical direction, the sealing connection part covers a connection section in a vertical direction, and the third sealing part covers a second extension section in a vertical direction. One end of the first sealing part is connected to one end of the second sealing part, the other end of the second sealing part is connected to one end of the sealing connection part, and the other end of the sealing connection part is connected to one end of the third sealing part.

5. The battery box as described in claim 4, characterized in that, In the vertical direction, the bottom edge of the lid is spaced apart from the first annular edge, and a first sealing part is provided between the bottom edge of the lid and the first annular edge. The cover plate and the connecting section are spaced apart, and a sealing connection part is provided between the cover plate and the connecting section. In the horizontal direction, the bottom edge of the lid is spaced apart from the first extension section, and a second sealing part is provided between the bottom edge of the lid and the first extension section. The first extension section and the third sealing part are spaced apart, and a second extension section is provided between the first extension section and the third sealing part.

6. The battery box as described in claim 1, characterized in that, The thickness of the first annular edge is between 1 and 1.5 mm, the thickness of the second annular edge is between 1 and 1.5 mm, the thickness of the box seal is between 3 and 5 mm, and the thickness of the box cover is between 0.8 and 1.2 mm.

7. The battery box as described in claim 4, characterized in that, The battery box also includes bolts and nuts. The first annular side is provided with at least one annular hole, the first sealing part is provided with at least one sealing hole, the bottom edge of the box cover is provided with at least one bottom edge hole, and the cover plate is provided with at least one cover plate hole. The annular hole, sealing hole, bottom edge hole, and cover plate hole are coaxially arranged in the vertical direction. The nut is located on the lower side of the first annular side in the vertical direction. The threaded shank of the bolt passes through the cover plate hole, bottom edge hole, sealing hole, and annular hole in the vertical direction and is detachably connected to the nut.

8. The battery box as described in claim 7, characterized in that, The diameter of the annular hole, sealing hole, bottom edge hole, and cover plate hole is 0.5 mm to 1 mm larger than the diameter of the bolt thread.

9. The battery box as described in claim 7, characterized in that, The bolt includes a bolt seal and a washer; in the vertical direction, the threaded shank of the bolt passes through the bolt seal and the washer, the bolt seal being located between the head of the bolt and the cover plate, and the washer being located between the head of the bolt and the bolt seal.

10. The battery box as claimed in claim 1, characterized in that, The lid also includes a lid side, which is continuously arranged circumferentially along the edge of the cover plate, and the lid side is located vertically between the edge of the cover plate and the bottom edge of the lid.

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