Sealed box body, battery pack and energy storage device

Abstract

The embodiment of the utility model provides a sealed box body, a battery pack and an energy storage device. The sealed box body comprises a box body, a top cover and a fixing structure for fixing the top cover to the box body, the box body comprises a first waterproof edge, the first waterproof edge comprises a length direction and a width direction, the fixing structure comprises a main body part provided with a fastening hole and a fixing part connected to the main body part, the fixing part is used for fixing the fixing structure to the first waterproof edge, and the fixing part and the main body part are arranged in the length direction of the first waterproof edge; the maximum size of the portion, making contact with the first waterproof edge, of the fixing part in the width direction of the first waterproof edge is smaller than or equal to the outer diameter of the main body part. According to the battery pack, the maximum size of the fixing structure in the width direction of the first waterproof edge is the same as the outer diameter of the main body part, so that the size of the fixing structure in the width direction of the first waterproof edge can be effectively reduced, the width of the first waterproof edge is effectively reduced, and miniaturization of the battery pack is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of box structures, and in particular to a sealed box, a battery pack and an energy storage device. Background Art

[0002] In the related art, a battery pack includes a case body, a top cover, and battery cells in the case body. The waterproof edge of the case body and the waterproof edge of the top cover are connected by standard screws and nuts. The high energy density of the battery pack has always been the research and development direction in this field. However, in the related art, for a battery pack, while keeping the overall size of the battery pack unchanged, how to expand the space in the case body for accommodating the battery cells is a difficult problem that needs to be solved urgently. Utility Model Content

[0003] The embodiments of the present application provide a sealed box, a battery pack and an energy storage device to improve the energy density of the battery pack.

[0004] In the first aspect, an embodiment of the present application provides a sealed box, the sealed box comprising a box, a top cover and a fixing structure for fixing the top cover to the box; the box comprises a first waterproof edge, the first waterproof edge comprises a length direction and a width direction, the fixing structure comprises a main body provided with a fastening hole and a fixing part connected to the main body, the fixing part is used to fix the fixing structure to the first waterproof edge, the axial direction of the fastening hole is perpendicular to the length direction of the first waterproof edge and the width direction of the first waterproof edge; the fixing part and the main body are arranged along the length direction of the first waterproof edge, and the maximum size of the part of the fixing part in contact with the first waterproof edge in the width direction of the first waterproof edge is less than or equal to the outer diameter of the main body. In this embodiment, since the fixing part and the main body are arranged along the length direction of the first waterproof edge, the fixing structure is fixedly connected to the first waterproof edge through its fixing part in the length direction of the first waterproof edge. Since the part of the fixing part in contact with the first waterproof edge can reduce the size in the width direction of the first waterproof edge to less than or equal to the outer diameter of the main body, the projection of the fixing part on the main body in the length direction of the first waterproof edge completely falls on the main body. The minimum size of the outer diameter of the main body is usually unchangeable. If the minimum size of the outer diameter of the main body is further reduced, the strength of the main body will be insufficient to fix the box body and the top cover. In this embodiment, the size of the portion of the fixing portion that contacts the first waterproof edge in the width direction of the first waterproof edge can be reduced to less than or equal to the outer diameter of the main body, thereby effectively reducing the size of the fixing portion in the width direction of the first waterproof edge. After the fixing portion is arranged on the first waterproof edge, the space occupied by the fixing portion in the width direction of the first waterproof edge can be effectively reduced, which is conducive to reducing the width size of the first waterproof edge. The space for accommodating the battery cells in the sealed box can be expanded while the overall size of the battery pack remains unchanged, so as to improve the energy density of the battery pack. In addition, by reducing the width size of the first waterproof edge, it is also conducive to realizing a miniaturized design of the size of the sealed box.

[0005] In some embodiments, there are two fixing parts, and the two fixing parts are located on opposite sides of the fastening hole in the length direction of the first waterproof edge. In this embodiment, since the fixing parts are located on both sides of the fastening hole in the length direction of the first waterproof edge, the main body is fixed to the first waterproof edge through the fixing parts on both sides in the length direction of the first waterproof edge. In this embodiment, the stability of the fixation with the first waterproof edge can be increased by increasing the size of the fixing part in the length direction of the first waterproof edge, and the size of the fixing part in the width direction of the first waterproof edge can be reduced as much as possible to reduce the size of the fixing structure in the width direction of the first waterproof edge, which can effectively reduce the space occupied by the fixing structure in the width direction of the first waterproof edge, which is conducive to reducing the width size of the first waterproof edge. In addition, the main body can be fixed to the first waterproof edge more stably through the two fixing parts.

[0006] In some embodiments, a rivet groove is provided on the side of the fixing part away from the fastening hole in the length direction of the first waterproof edge, and the rivet groove is used to connect with the first waterproof edge by rivet. In this embodiment, the first waterproof edge can be connected by rivet through the rivet groove. Since the rivet groove is located on the side of the fixing part away from the fastening hole in the length direction of the first waterproof edge, a large interaction force will be generated between the end of the fixing part in the length direction of the first waterproof edge and the first waterproof edge, so that the first waterproof edge can be stably connected with the fixing part in the length direction of the first waterproof edge. Under the premise of ensuring a stable connection between the first waterproof edge and the fixing part, the size of the fixing structure can be selectively reduced as much as possible in the width direction of the first waterproof edge to reduce the space occupied by the fixing structure in the width direction of the first waterproof edge, which is conducive to reducing the width dimension of the first waterproof edge.

[0007] In some embodiments, a through hole connected to the fastening hole is provided on the first waterproof edge, and the fixing part passes through the through hole, and the size of the through hole in the width direction of the first waterproof edge is greater than or equal to the size of the fixing part in the width direction of the first waterproof edge. In this embodiment, since the width of the through hole in the width direction of the first waterproof edge is greater than or approximately equal to the width of the fixing part, after the fixing part is assembled into the through hole, there is a gap or slight contact between the fixing part and the first waterproof edge in the width direction of the first waterproof edge, so that in the width direction of the first waterproof edge, no large force is generated between the two end surfaces of the fixing part and the first waterproof edge, so that in the width direction of the first waterproof edge, even if the width of the portion between the edge of the through hole of the first waterproof edge and the edge of the first waterproof edge is small, it will not be broken because it will not generate a large force with the fixing part, so that the width of the portion between the edge of the through hole of the first waterproof edge and the edge of the first waterproof edge can be effectively reduced in the width direction of the first waterproof edge, and then the width of the first waterproof edge can be reduced, so as to effectively reduce the size of the sealed box, which is conducive to the miniaturization of the sealed box.

[0008] In some embodiments, the sealed box body further includes a sealing ring, the top cover includes a second waterproof edge, the sealing ring is located between the first waterproof edge and the second waterproof edge, the first waterproof edge is provided with a through hole connected to the fastening hole, and the fixing portion passes through the through hole and protrudes from the surface of the first waterproof edge facing the top cover. In this embodiment, since the fixing portion passes through and exceeds the surface of the first waterproof edge facing the top cover, the portion of the fixing portion exceeding the surface of the first waterproof edge facing the top cover can limit the second waterproof edge to a preset position relative to the first waterproof edge, preventing the first waterproof edge from continuing to squeeze the sealing ring, and thus preventing the interaction force between the fixed structure and the matching component from exceeding a certain value, thereby preventing the fixed structure and the matching component or the first waterproof edge and the second waterproof edge from being damaged by excessive force.

[0009] In some embodiments, the fixing structure further includes a substrate, the substrate is connected to the radial outer peripheral surface of the main body, the fixing part is connected to the surface of the substrate along the axial direction of the main body facing the top cover, and the substrate is stacked on the side of the first waterproof edge away from the top cover. In this embodiment, since the substrate is stacked on the side of the first waterproof edge away from the top cover, when the fitting is connected to the fastening hole, when the axial tension of the fastening hole is applied to the main body, that is, when the fitting applies a tension in the height direction of the box body to the fastening hole, since the substrate is connected to the outer peripheral surface of the main body, and the substrate is stacked on the side of the first waterproof edge away from the top cover, the fixing structure can be prevented from being pulled away from the first waterproof edge by the clamping position of the substrate and the first waterproof edge, so as to improve the stability of the fitting and the fixing structure in fixing the top cover to the box body.

[0010] In some embodiments, the fixing structure further includes a base plate, which is connected to the radial outer peripheral surface of the main body in a surrounding manner, and the base plate is stacked on the side of the first waterproof edge away from the top cover. The fixing portion is a fixing hole provided on the base plate, and the fixing hole is used to fix with the first waterproof edge. The first waterproof edge is provided with an assembly hole connected with the fixing hole, and the fixing hole and the assembly hole are used to be connected by fasteners. In this embodiment, since the fixing portion is a fixing hole provided on the base plate, the base plate can be fixed to the first waterproof edge by cooperating with the fixing hole and the assembly hole, thereby fixing the main body to the first waterproof edge.

[0011] In some embodiments, the sealed box body further includes a sealing ring, the top cover includes a second waterproof edge, the sealing ring is located between the first waterproof edge and the second waterproof edge, a limiting portion protrudes on the side of the substrate facing the first waterproof edge, a through hole connected to the fastening hole is provided on the first waterproof edge, and the limiting portion passes through the through hole and protrudes from the surface of the first waterproof edge facing the top cover. In this embodiment, since the limiting portion passes through the through hole and protrudes from the surface of the first waterproof edge facing the top cover, the portion of the limiting portion that exceeds the surface of the first waterproof edge facing the top cover can limit the second waterproof edge to a preset position relative to the first waterproof edge, preventing the first waterproof edge from continuing to squeeze the sealing ring, and thus preventing the interaction force between the fixed structure and the matching component from exceeding a certain value, thereby preventing the fixed structure and the matching component or the first waterproof edge and the second waterproof edge from being damaged by excessive force.

[0012] In some embodiments, the fixing structure further includes a base plate, the base plate is connected to the radial outer peripheral surface of the main body, the base plate is stacked on the side of the first waterproof edge away from the top cover, the base plate is welded to the first waterproof edge, and the fixing portion is the portion where the base plate and the first waterproof edge are welded. In this embodiment, the base plate is fixed to the first waterproof edge by welding the fixing portion to the first waterproof edge, thereby fixing the main body to the first waterproof edge.

[0013] In some embodiments, the first waterproof edge includes a first folded edge bent from the side wall of the box body, a second folded edge bent from the first folded edge, and a third folded edge bent from the second folded edge, and the first folded edge and the third folded edge are located on the same side of the second folded edge; the top cover includes a second waterproof edge, the second waterproof edge includes a fourth folded edge bent from the top wall of the top cover, a fifth folded edge bent from the fourth folded edge, and a sixth folded edge bent from the fifth folded edge, the fourth folded edge and the sixth folded edge are located on opposite sides of the fifth folded edge, and the third folded edge and the fifth folded edge are stacked; the fixing portion is fixed to the third folded edge, and the sealed box body also includes a fitting, which is connected through the fifth folded edge and the fastening hole.

[0014] In the present embodiment, since the dimension of the fixing structure in the width direction of the first waterproof edge is small enough, the feasibility of simultaneously connecting the sealing ring and the fixing structure to the third fold edge is improved, so that there is no need to set up an additional intermediate piece. In addition, since the fixing portion exceeds the surface of the third fold edge toward the fifth fold edge, the fixing portion can limit the relative position of the third fold edge and the fifth fold edge. In addition, in the present embodiment, the limiting effect brought by the surface of the fixing structure exceeding the third fold edge toward the fifth fold edge can make the fixing structure as close to the edge of the third fold edge as possible. In the width direction of the third fold edge, the third fold edge can accommodate the fixing structure and the sealing ring at the same time, which can avoid the installation of intermediate pieces, which can not only save costs but also simplify the difficulty of assembly.

[0015] In the second aspect, an embodiment of the present application provides a sealed box body, which includes a box body, a top cover, a sealing ring, and a fixing structure and a matching piece for fixing the box body and the top cover, the box body includes a first waterproof edge, the top cover includes a second waterproof edge, and the sealing ring is located between the first waterproof edge and the second waterproof edge; the first waterproof edge includes a length direction and a width direction, the fixing structure includes a substrate and a fixing portion protruding from one side of the substrate and a main body protruding from a side of the fixing portion away from the substrate, the main body is a screw structure, the dimension of the fixing portion in the length direction of the first waterproof edge is greater than the dimension in the width direction of the first waterproof edge, and the maximum dimension of the fixing portion in the width direction of the first waterproof edge is less than or equal to the outer diameter of the matching piece.

[0016] In this embodiment, by setting the dimension of the fixing part in the length direction of the first waterproof edge larger than the dimension in the width direction of the first waterproof edge, the dimension of the fixing part in the width direction of the first waterproof edge can be effectively reduced, and the space occupied by the fixing part in the width direction of the first waterproof edge can be reduced, which is conducive to reducing the width dimension of the first waterproof edge. When the overall size of the battery pack remains unchanged, the space for accommodating the battery cells in the sealed box can be expanded to improve the energy density of the battery pack. In addition, by reducing the width dimension of the first waterproof edge, it is also conducive to miniaturizing the size of the sealed box.

[0017] In some embodiments, a through hole is provided on the first waterproof edge, the substrate is stacked on the side of the first waterproof edge away from the top cover, and the fixing portion passes through the through hole and protrudes from the surface of the first waterproof edge facing the top cover. In this embodiment, the interaction force between the fixing structure and the matching part can be prevented from exceeding a certain value, thereby preventing the fixing structure and the matching part or the first waterproof edge and the second waterproof edge from being damaged by excessive force.

[0018] In some embodiments, the fixing part is provided with rivet grooves at both ends of the length direction of the first waterproof edge, and the rivet grooves are used to connect with the first waterproof edge by rivet. In this embodiment, the fixing part is provided with rivet grooves at both ends of the length direction of the first waterproof edge, and can be connected with the first waterproof edge by rivet. Moreover, since the rivet grooves are located at both ends of the length direction of the first waterproof edge of the fixing part, the size of the fixing part in the width direction of the first waterproof edge can be effectively reduced, and the space occupied by the fixing part in the width direction of the first waterproof edge can be reduced, which is conducive to reducing the width size of the first waterproof edge.

[0019] In some embodiments, the length direction of the substrate is the same as the length direction of the first waterproof edge, and two fixing holes for fixing with the first waterproof edge are opened at both ends of the length direction of the substrate, and the two fixing holes are located on two radially opposite sides of the main body, and the inner diameters of the two fixing holes are both smaller than the outer diameter of the main body. In this embodiment, the fixing holes can be used to achieve a fixed connection between the fixing structure and the first waterproof edge. Since the inner diameter of the fixing holes is smaller than the outer diameter of the main body, the size of the substrate in the width direction of the first waterproof edge can be effectively reduced, and the space occupied by the substrate in the width direction of the first waterproof edge can be reduced, which is conducive to reducing the width size of the first waterproof edge, so as to achieve miniaturization of the sealed box.

[0020] In a third aspect, an embodiment of the present application provides a battery pack, comprising a battery cell and a sealed box as described in any one of the first aspect or any one of the second aspect above, wherein the battery cell is disposed in the sealed box.

[0021] In a fourth aspect, an embodiment of the present application provides an energy storage device, which includes a cabinet and a plurality of battery packs as described in the third aspect above, located in the cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0023] Figure 1 An application scenario diagram of an energy storage system provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of an energy storage device provided in an embodiment of the present application;

[0025] Figure 2A A simplified structural view of the battery pack box and the rivet nut in the related art;

[0026] Figure 3 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0027] Figure 4 An exploded schematic diagram of a sealed box provided in an embodiment of the present application;

[0028] Figure 5 for Figure 4 A schematic diagram of a portion of the structure of the sealed box;

[0029] Figure 6 for Figure 4 A local enlarged schematic diagram of the middle A;

[0030] Figure 7 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0031] Figure 8 for Figure 3 A partial cross-sectional view of a portion of the structure of the sealed box in the embodiment;

[0032] Fig. 9 for Figure 8 A cross-sectional view of the structure in the embodiment without the matching piece and the top cover;

[0033] Fig.10 for Figure 3 A partial enlarged cross-sectional view of a part of the structure of the sealing box;

[0034] Fig.11 A structural schematic diagram of another fixing structure provided in an embodiment of the present application;

[0035] Fig. 12A A structural schematic diagram of another fixing structure provided in an embodiment of the present application;

[0036] Fig. 12B for Fig. 12A A schematic diagram of the structure in which the fixed structure cooperates with the first waterproof edge;

[0037] Fig.13A A structural schematic diagram of another fixing structure provided in an embodiment of the present application;

[0038] Fig. 13B for Fig.13A Schematic diagram of the structure in which the fixing structure is fixed to the box body and the top cover.

[0039] Description of reference numerals:

[0040] X, the length direction of the first waterproof edge; Y, the width direction of the first waterproof edge; Z, the axial direction of the fastening hole;

[0041] 1000. Energy storage system; 1. Energy storage device; 2. Power converter; 3. Cabinet; 4. Battery cluster; 5. Battery pack; 5a. Sealed box; 6. Waterproof edge of box; 7. Riveted nut; 8. Main body; 9. Riveted edge;

[0042] 10. Box body; 11. First waterproof edge; 111. Through hole; 112. First folded edge; 113. Second folded edge; 114. Third folded edge; 115. Groove; 12. Side wall;

[0043] 20. top cover; 21. second waterproof edge; 211. fourth folded edge; 212. fifth folded edge; 213. sixth folded edge; 22. top wall;

[0044] 30. fixing structure; 31. main body; 311. fastening hole; 32. fixing part; 321. fixing body; 3211. rivet groove; 322. rivet edge;

[0045] 40. Matching parts;

[0046] 50. Sealing ring;

[0047] 60. base plate; 61. fixing hole;

[0048] 70. Limiting part;

[0049] 81. Base plate; 82. Fixed part; 83. Main part. DETAILED DESCRIPTION

[0050] The following first explains some terms involved in the embodiments of the present application.

[0051] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] In this specification, the terms "perpendicular", "parallel", etc. are explained.

[0053] Vertical: The verticality defined in this application is not limited to an absolute vertical intersection relationship (angle of 90 degrees). It allows for non-absolute vertical intersection relationships caused by factors such as assembly tolerance, design tolerance, and influence of structural flatness. It also allows for errors in a small angle range. For example, the assembly error range of 80 to 100 degrees can be understood as a vertical relationship.

[0054] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, which allows for situations where the absolute parallelism is not caused by factors such as assembly tolerance, design tolerance, and influence of structural flatness. These situations will lead to the sliding fitting part and the first door panel not being absolutely parallel, but this application also defines this situation as parallelism.

[0055] Figure 1 An application scenario diagram of an energy storage system 1000 provided in an embodiment of the present application, wherein: Figure 1 The energy storage system 1000 is shown in three scenarios: applied on the power supply side, the distribution side and the user side.

[0056] Reference Figure 1 The energy storage system 1000 includes an energy storage device 1 and a power converter 2. The energy storage device 1 is connected to the power converter 2. The energy storage device is used to store electric energy. The power converter 2 is used to perform power conversion on the current input to the energy storage device 1 or the current output from the energy storage device 1.

[0057] Among them, the energy storage system 1000 can be used on the power supply side, the distribution side and the user side. For example, the energy storage system 1000 on the power supply side provides storage and output management for the electric energy output by the DC source, the energy storage system 1000 on the distribution side provides intelligent load management for the transmission and distribution side, and the energy storage system 1000 on the user side provides users with peak shaving and valley filling mode and stable power quality management.

[0058] For example, the energy storage system is a photovoltaic energy storage system located on the power supply side. The photovoltaic energy storage system includes photovoltaic (PV) panels and photovoltaic inverters (that is, the power converter 2 mentioned above) and energy storage devices. Photovoltaic panels convert solar energy into electrical energy. Since photovoltaic panels generate direct current, it is necessary to convert direct current into alternating current through photovoltaic inverters to facilitate the transmission and utilization of electricity.

[0059] The photovoltaic energy storage system may also include a thermal management system, which cools the battery cluster, photovoltaic inverter, etc. of the energy storage device through a liquid cooling medium. The thermal management system includes a thermal management module, which will be described in detail later.

[0060] Figure 2 A schematic diagram of the structure of an energy storage device 1 provided in an embodiment of the present application. Figure 2 The energy storage device 1 in the embodiment can be applied to Figure 1 The power supply side, distribution side and user side.

[0061] Reference Figure 2 The energy storage device 1 includes a cabinet 3 and a battery cluster 4 and a liquid cooling unit located in the cabinet 3. The battery cluster 4 is used to store or output electric energy, and the liquid cooling unit is used to cool the battery cluster 4.

[0062] The battery cluster 4 includes a plurality of battery packs 5, and the plurality of battery packs 5 can be stacked. The energy density of each battery pack 5 in this embodiment can directly affect the energy density of the energy storage device 1, so how to effectively improve the energy density of the battery pack 5 is one of the necessary ways to improve the overall energy density of the energy storage device 1.

[0063] It is understandable that the energy storage device 1 may also include other components such as a cluster control box, a power distribution cabinet, and a fan.

[0064] Figure 2AIt is a simplified structural view of the battery pack box and the rivet nut 7 in the related art.

[0065] like Figure 2A In the related art, the battery pack includes a box body and a top cover, which are connected by screws and nuts, wherein a rivet nut 7 is provided on the waterproof edge 6 of the box body, and the rivet nut 7 uses a standard part. The width of the waterproof edge 6 of the box body is limited by the size of the rivet nut 7 and the installation standard of the rivet nut 7, which results in the width of the waterproof edge in the related art being too wide and taking up too much space, resulting in the battery pack being unable to be further miniaturized. Therefore, how to further miniaturize the battery pack while the space for accommodating the battery cells in the box body remains unchanged is a difficult problem that needs to be overcome, and how to expand the space for accommodating the battery cells in the box body while the overall size of the battery pack 5 remains unchanged is also a difficult problem that needs to be solved urgently.

[0066] Specifically, the rivet nut 7 in the related art usually includes a main body 8 with a threaded hole and a rivet edge 9 surrounding the main body 8. The rivet nut 7 is pressed together with the waterproof edge 6 of the box through its rivet edge 9 by a riveting machine. In order to ensure the strength of the action between the rivet edge 9 and the waterproof edge 6 of the box, the distance from the edge of the waterproof edge to the edge of the rivet edge 9 must be greater than a certain value, so that the width of the waterproof edge 6 of the box is limited by the size of the rivet nut 7 and the installation standard of the rivet nut 7, and cannot be further narrowed.

[0067] Figure 3 A schematic diagram of the structure of a battery pack 5 provided in an embodiment of the present application; Figure 4 This is a schematic diagram of an exploded view of a sealed box 5a provided in an embodiment of the present application. Figure 3 The battery pack 5 in the embodiment can not only be used for Figure 2 The energy storage device 1 in the embodiment can also be applied to other fields that require the use of a battery pack 5, such as vehicles in the field of transportation, energy storage cabinets in vehicle charging scenarios, etc.

[0068] Reference Figure 3 and Figure 4 The battery pack 5 includes a sealed box 5a and a plurality of cells (not shown) in the sealed box. The battery pack 5 in this embodiment further miniaturizes the battery pack 5 or increases the space for accommodating the cells by reducing the width of the waterproof edge of the sealed box 5a.

[0069] Figure 4 The sealed box 5a in the embodiment can be used not only Figure 3 The battery pack 5 in the embodiment may also be used in other box devices that need to be sealed, such as inverters and some outdoor power modules.

[0070] Reference Figure 4The sealed box 5a includes a box 10 and a top cover 20. A plurality of cells are contained in the box 10. The top cover 20 is placed on the box 10 to achieve a sealed arrangement. For example, for the battery pack 5, if the size of the space for containing cells in the box 10 remains unchanged, it is difficult to further miniaturize the battery pack 5, which is also a problem that needs to be solved urgently. In addition, if the overall size of the battery pack 5 remains unchanged, how to expand the space for containing cells in the box 10 is also a problem that needs to be solved urgently.

[0071] In order to improve the waterproof performance of the connection between the top cover 20 and the box body 10, a first waterproof edge 11 is provided at the connection between the box body 10 and the top cover 20, and a second waterproof edge 21 is provided at the connection between the top cover 20 and the box body 10. The box body 10 and the top cover 20 are fixed by the first waterproof edge 11 and the second waterproof edge 21. In order to achieve the miniaturization of the sealed box body 5a or increase the accommodation space, this embodiment further achieves the miniaturization of the sealed box body 5a or increases the accommodation space by reducing the width of the first waterproof edge 11. It can be understood that the first waterproof edge 11 and the second waterproof edge 21 in this embodiment are both roughly strip-shaped, so that for the first waterproof edge 11, the first waterproof edge 11 includes a length direction X and a width direction Y that are perpendicular to each other. It should also be noted that. For the box body 10, the first waterproof edge 11 is included not only in the length direction of the box body 10, but also in the width direction of the box body 10. The length direction X of the first waterproof edge 11 in the length direction of the box body 10 is consistent with the length direction of the box body 10. The length direction X of the first waterproof edge 11 arranged in the width direction of the box body 10 is consistent with the width direction of the box body 10. In other words, the length directions X of the first waterproof edge 11 at different positions of the box body 10 are not necessarily completely the same.

[0072] In some embodiments, the sealed box 5a further includes a fixing structure 30 and a fitting 40 for fixing the top cover 20 to the box 10. For example, the purpose of fixing the top cover 20 to the box 10 can be achieved by the fixing structure 30 and the fitting 40. For example, in some embodiments, the fixing structure 30 is connected to the first waterproof edge 11, and the fitting 40 is used to connect with the fixing structure 30, and then the fitting 40 and the fixing structure 30 are used to fix the top cover 20 to the box 10. For another example, in some embodiments, the fixing structure 30 is a nut, and the fitting 40 is a screw. It can be understood that the number of the fixing structures 30 of the sealed box 5a is multiple, and different fixing structures 30 may cooperate with different first waterproof edges 11.

[0073] In some embodiments, the sealed box body 5a further includes a sealing ring 50, which is disposed between the first waterproof edge 11 and the second waterproof edge 21. The sealing ring 50 can effectively improve the sealing between the box body 10 and the top cover 20.

[0074] In some embodiments, the fixed structure 30 and the matching component 40 are located on the periphery of the area surrounded by the sealing ring 50, so that no additional sealing treatment is required between the fixed structure 30 and the first waterproof edge 11, and between the matching component 40 and the second waterproof edge 21 in this embodiment, and the sealing between the box body 10 and the top cover 20 can still be ensured.

[0075] Figure 5 for Figure 4 The partial structural diagram of the sealed box body 5a in FIG. 1 specifically includes a fixed structure 30 and a substrate 60 connected to the fixed structure 30. Figure 6 for Figure 4 A local enlarged schematic diagram of the middle A; Figure 7 for Figure 4 A local enlarged schematic diagram of point B in the middle.

[0076] Reference Figure 5 and Figure 6 In some embodiments, the fixing structure 30 includes a main body 31 having a fastening hole 311 and a fixing part 32 connected to the main body 31, the fixing part 32 is connected to the first waterproof edge 11, the axial direction Z of the fastening hole 311 is perpendicular to the length direction X of the first waterproof edge 11 and the width direction Y of the first waterproof edge 11, and the fixing part 32 and the main body 31 are arranged along the length direction X of the first waterproof edge 11. The maximum dimension of the fixing structure 30 in the width direction Y of the first waterproof edge 11 is the same as the outer diameter of the main body 31. In this embodiment, the main body 31 is used to connect with the matching piece 40 to achieve a fixed connection between the fixing structure 30 and the matching piece 40. Specifically, the matching piece 40 can be connected with the fastening hole 311 on the main body 31 to achieve a fixed connection between the fixing structure 30 and the matching piece 40. For example, in some embodiments, the fastening hole 311 is a threaded hole, and the matching piece 40 is a bolt or a screw.

[0077] In this embodiment, since the fixing portion 32 and the main body 31 are arranged along the length direction X of the first waterproof edge 11, the fixing structure 30 is fixedly connected to the first waterproof edge 11 through the fixing portion 32 in the length direction X of the first waterproof edge 11. It should be noted that the fixing portion 32 and the main body 31 are arranged along the length direction X of the first waterproof edge 11, which specifically means that the center position of the fixing portion 32 in the width direction of the first waterproof edge 11 and the central axis of the main body 31 are arranged along the length direction X of the first waterproof edge 11, that is, in the length direction X of the first waterproof edge 11, the fixing portion 32 and the main body 31 are in a positive relationship, and there is no deviation in the width direction Y of the first waterproof edge 11.

[0078] The maximum dimension of the portion of the fixing portion 32 in contact with the first waterproof edge 11 in the width direction Y of the first waterproof edge 11 is less than or equal to the outer diameter of the main body 31, so that Figure 2A For the nut in the related art, the portion of the fixing portion 32 in this embodiment that contacts the first waterproof edge 11 can be reduced in size to be less than or equal to the outer diameter of the main body 31 in the width direction Y of the first waterproof edge 11, so that the projection of the fixing portion 32 on the main body 31 in the length direction of the first waterproof edge 11 completely falls on the main body 31. The minimum size of the outer diameter of the main body 31 is usually unchangeable. If the minimum size of the outer diameter of the main body 31 is further reduced, the strength of the main body 31 will be insufficient to fix the box body 10 and the top cover 20. In this embodiment, the portion of the fixing portion 32 in contact with the first waterproof edge 11 can be reduced in size in the width direction Y of the first waterproof edge 11 to be less than or equal to the outer diameter of the main body 31, so that the size of the fixing portion 32 in the width direction Y of the first waterproof edge 11 is effectively reduced. After the fixing portion 32 is arranged on the first waterproof edge 11, the space occupied by the fixing portion 32 in the width direction Y of the first waterproof edge 11 can be effectively reduced, which is conducive to reducing the width dimension of the first waterproof edge 11. When the overall size of the battery pack 5 remains unchanged, the space for accommodating the battery cells in the sealed box 5a can be expanded to improve the energy density of the battery pack 5. In addition, by reducing the width dimension of the first waterproof edge 11, it is also conducive to realizing a miniaturized design of the size of the sealed box 5a.

[0079] Reference Figure 7 A through hole 111 is opened on the first waterproof edge 11 , and the through hole 111 is used to connect with the fixing structure 30 , thereby realizing the connection between the fixing structure 30 and the first waterproof edge 11 .

[0080] Reference Figure 5-Figure 7In some embodiments, the fixing portion 32 is connected to the through hole 111 , and a size of the through hole 111 in the width direction Y of the first waterproof edge 11 is greater than or approximately equal to a size of the fixing portion 32 in the width direction Y of the first waterproof edge 11 . Since the width of the through hole 111 is greater than or approximately equal to the width of the fixing portion 32 in the width direction Y of the first waterproof edge 11, after the fixing portion 32 is assembled into the through hole 111, there is a gap or slight contact between the fixing portion 32 and the first waterproof edge 11 in the width direction Y of the first waterproof edge 11, so that in the width direction Y of the first waterproof edge 11, no large force is generated between the two end surfaces of the fixing portion 32 and the first waterproof edge 11, so that in the width direction Y of the first waterproof edge 11, even if the width H2 of the portion between the edge of the through hole 111 of the first waterproof edge 11 and the edge of the first waterproof edge 11 is small, it will not be damaged, such as broken, because no large force is generated with the fixing portion 32, so that the width of the portion between the edge of the through hole 111 of the first waterproof edge 11 and the edge of the first waterproof edge 11 can be effectively reduced in the width direction Y of the first waterproof edge 11, and then the width of the first waterproof edge 11 can be reduced, so as to expand the space for accommodating battery cells in the sealed box 5a while keeping the overall size of the battery pack 5 unchanged, so as to improve the energy density of the battery pack 5. The size of the box body 10 of the sealed box body 5a can also be effectively reduced, thereby facilitating the miniaturization of the sealed box body 5a.

[0081] In some embodiments, the number of the fixing parts 32 is two, and the two fixing parts 32 are located on opposite sides of the fastening hole 311 in the length direction X of the first waterproof edge 11. In this embodiment, since the fixing parts 32 are located on both sides of the fastening hole 311 in the length direction X of the first waterproof edge 11, the main body 31 is fixed to the first waterproof edge 11 through the fixing parts 32 on both sides in the length direction X of the first waterproof edge 11, and in the width direction Y of the first waterproof edge 11, the size of the fixing structure 30 is smaller than the outer diameter of the main body 31, so that in this embodiment, the size of the fixing part 32 in the length direction X of the first waterproof edge 11 can be increased to increase the stability of the fixation with the first waterproof edge 11, and the size of the fixing part 32 in the width direction Y of the first waterproof edge 11 can be reduced as much as possible to reduce the size of the fixing structure 30 in the width direction Y of the first waterproof edge 11, effectively reducing the space occupied by the fixing structure 30 in the width direction of the first waterproof edge 11, so as to reduce the width of the first waterproof edge 11. In addition, the main body 31 can be fixed to the first waterproof edge 11 more stably through the two fixing parts 32.

[0082] In some embodiments, the fixing portion 32 is fixedly connected to the first waterproof edge 11 by riveting. For example, the fixing portion 32 is assembled to the through hole 111 and then riveted by riveting equipment.

[0083] In some embodiments, the end of the fixing portion 32 away from the fastening hole 311 in the length direction X of the first waterproof edge 11 is used for riveting connection with the first waterproof edge 11, that is, a large interaction force will be generated between the end of the fixing portion 32 in the length direction X of the first waterproof edge 11 and the first waterproof edge 11 in this embodiment, and the length of the first waterproof edge 11 in the length direction X can be relatively long, much larger than the standard margin required when the fixing portion 32 and the first waterproof edge 11 are riveted, so that the first waterproof edge 11 can be stably connected to the fixing portion 32 in the length direction X of the first waterproof edge 11. In the width direction Y of the first waterproof edge 11, the size of the fixing structure 30 can be minimized, effectively reducing the space occupied by the fixing structure 30 in the width direction of the first waterproof edge 11, so as to reduce the width of the first waterproof edge 11.

[0084] In some embodiments, a rivet groove 3211 is provided on the side of the fixing portion 32 away from the fastening hole 311 in the length direction X of the first waterproof edge 11, and the rivet groove 3211 is used to rivet the fixing portion 32 to the first waterproof edge 11. In this embodiment, the fixing portion 32 can be riveted to the first waterproof edge 11 through the rivet groove 3211. Since the rivet groove 3211 is located on the side of the fixing portion 32 away from the fastening hole 311 in the length direction X of the first waterproof edge 11, a large interaction force will be generated between the end of the fixing portion 32 in the length direction X of the first waterproof edge 11 and the first waterproof edge 11, so that the first waterproof edge 11 can be stably connected to the fixing portion 32 in the length direction X of the first waterproof edge 11. Under the premise of ensuring a stable connection between the first waterproof edge 11 and the fixing portion 32, the size of the fixing structure 30 can be selectively reduced as much as possible in the width direction Y of the first waterproof edge 11, effectively reducing the space occupied by the fixing structure 30 in the width direction of the first waterproof edge 11, so as to reduce the width of the first waterproof edge 11.

[0085] In some embodiments, both fixing portions 32 are provided with a rivet groove 3211 .

[0086] Reference Figure 5In some specific embodiments, the fixing portion 32 includes a fixing body 321, a rivet edge 322 protruding from the fixing body 321, and a rivet groove 3211 provided on the fixing body 321, wherein the rivet edge 322 is adjacent to the rivet groove 3211. The rivet edge 322 and the rivet groove 3211 are both located on a side of the fixing body 321 away from the fastening hole 311 in the length direction X of the first waterproof edge 11. In this embodiment, the fixing body 321 is provided in the through hole 111, and the rivet edge 322 is at least partially located outside the through hole 111 in the length direction X of the first waterproof edge 11. The rivet edge 322 and the first waterproof edge 11 at the edge of the through hole 111 can be riveted together by a riveting machine, and a part of the first waterproof edge 11 can be pressed into the rivet groove 3211, so that the first waterproof edge 11 and the fixing portion 32 can be stably connected by the engagement of the rivet groove 3211 and the part of the first waterproof edge 11 pressed into the rivet groove 3211.

[0087] It is understandable that in some embodiments, the structures of the two fixing portions 32 may be the same, both having a riveting edge 322 and a riveting groove 3211. Of course, in other embodiments, one of the fixing portions 32 may be connected to the first waterproof edge 11 by riveting, while the other fixing portion 32 may be connected to the first waterproof edge 11 by other means, such as rivet connection.

[0088] Reference Figure 5-Figure 7 In some embodiments, the fixing structure 30 further includes a strip-shaped substrate 60, which is connected to the radial outer peripheral surface of the main body 31. The substrate 60 is used to engage with the first waterproof edge 11 in the height direction of the box body 10 (also in the axial direction Z of the fastening hole 311) to prevent the fixing structure 30 from being separated from the first waterproof edge 11.

[0089] For example, in some embodiments, the substrate 60 includes two surfaces that are axially opposite to each other in the main body 31, and the fixing portion 32 is located on a surface of the substrate 60 that faces the top cover 20 along the axial direction of the main body 31. The fixing portion 32 is inserted into the through hole 111, and the substrate 60 is stacked on the side of the first waterproof edge 11 that is away from the top cover 20, so that when the fitting 40 is connected to the fastening hole 311, when the axial tension of the fastening hole 311 is applied to the main body 31, that is, when the fitting 40 applies a tension in the height direction of the box 10 to the fastening hole 311, since the substrate 60 is connected to the outer peripheral surface of the main body 31, and the substrate 60 is stacked on the side of the first waterproof edge 11 that is away from the top cover 20, the fixing structure 30 can be prevented from being pulled away from the first waterproof edge 11 by the clamping position of the substrate 60 and the first waterproof edge 11, so as to improve the stability of the fitting 40 and the fixing structure 30 in fixing the top cover 20 to the box 10.

[0090] In some embodiments, the riveting edge 322 is adjacent to the substrate 60, and the riveting edge 322 can be accurately and conveniently riveted to the first waterproof edge 11 through the limitation of the substrate 60. For example, in some embodiments, the size of the substrate 60 is larger than the size of the fixed structure 30 in the width direction Y of the first waterproof edge 11. For another example, in some embodiments, the size of the substrate 60 is larger than the size of the fixed structure 30 in the length direction X of the first waterproof edge 11. By making the size of the substrate 60 larger than the size of the fixed structure 30, the substrate 60 can be conveniently used to play a limiting role, so as to accurately and conveniently rivet the riveting edge 322 and the first waterproof edge 11 together, and the fixed structure 30 can be prevented from being pulled away from the first waterproof edge 11 through the clamping of the substrate 60 and the first waterproof edge 11.

[0091] In some embodiments, the substrate 60 is connected to one of the axial ends of the main body 31, and the axial end face of the main body 31 is flush with one of the axial surfaces of the substrate 60 of the main body 31, while the other surface of the substrate 60 is located between the two axial ends of the main body 31. The fixing portion 32 is provided on the surface of the substrate 60 that is flush with the end face of the main body 31. In this embodiment, since the fixing portion 32 and the main body 31 are roughly located on opposite sides of the substrate 60, the fixing portion 32 can be provided in the through hole 111, the substrate 60 abuts against the side of the first waterproof edge 11 away from the top cover 20, the main body 31 is also located on the side of the first waterproof edge 11 away from the top cover 20, the through hole 111 is connected to the fastening hole 311, and the fitting 40 is connected to the fastening hole 311 after passing through the through hole 111.

[0092] In some embodiments, the length direction of the substrate 60 is the same as the length direction X of the first waterproof edge 11 , so as to avoid the limitation of the substrate 60 on the miniaturization of the sealed box 5 a.

[0093] It is understood that in some embodiments, the main body 31 may be cylindrical. In other embodiments, the main body 31 may also be prismatic.

[0094] In some embodiments, the fastening hole 311 may be a circular hole. In other embodiments, the fastening hole 311 may also be a hole of other shapes, such as a square hole.

[0095] In some other embodiments, the fastening hole 311 may also be fixed together with the fitting 40 by interference fit.

[0096] Figure 8 for Figure 3 A partial cross-sectional view of a portion of the structure of the sealed box 5a in the embodiment; Fig. 9 for Figure 8 The cross-sectional view of the structure in the embodiment without the fitting 40 and the top cover 20. Figure 8The top cover 20 is fixed to the box body 10 by the fitting 40 and the fixing structure 30 , and the sealing ring 50 is a schematic structural diagram when being compressed. Fig. 9 It is a structural schematic diagram when the top cover 20 is not fixed to the box body 10 and only the fixing structure 30 , the sealing ring 50 and the first waterproof edge 11 are assembled together.

[0097] Reference Figure 8 and Fig. 9 In some embodiments, the sealed box body 5a further includes a sealing ring 50, which is located between the first waterproof edge 11 and the second waterproof edge 21, and a portion of the fixed portion 32 passes through and exceeds the surface of the first waterproof edge 11 facing the top cover 20. In this embodiment, after the second waterproof edge 21 is pressed on the sealing ring 50, as the force between the fixed structure 30 and the matching piece 40 is tightened, the pressure of the second waterproof edge 21 and the first waterproof edge 11 on the sealing ring 50 is also greater, and the thickness of the sealing ring 50 becomes smaller after being squeezed. It can be understood that the smaller the thickness of the sealing ring 50 after being squeezed, the better the sealing effect between the first waterproof edge 11 and the second waterproof edge 21, and the greater the interaction force between the fixed structure 30 and the matching piece 40. When the interaction force between the fixed structure 30 and the matching piece 40 exceeds a certain value, the fixed structure 30 and the matching piece 40 or the first waterproof edge 11 and the second waterproof edge 21 may be damaged due to excessive force. In this embodiment, since the fixing portion 32 passes through and exceeds the surface of the first waterproof edge 11 facing the top cover 20, the portion of the fixing portion 32 that exceeds the surface of the first waterproof edge 11 facing the top cover 20 can limit the second waterproof edge 21 to a preset position relative to the first waterproof edge 11, preventing the first waterproof edge 11 from continuing to squeeze the sealing ring 50, and thus preventing the interaction force between the fixed structure 30 and the matching component 40 from exceeding a certain value, thereby preventing the fixed structure 30 and the matching component 40 or the first waterproof edge 11 and the second waterproof edge 21 from being damaged by excessive force.

[0098] In some embodiments, the height of the portion of the fixing portion 32 that exceeds the surface of the first waterproof edge 11 facing the top cover 20 is less than the initial thickness of the sealing ring 50, and the initial thickness of the sealing ring 50 is the thickness of the sealing ring 50 when it is not squeezed. The height of the portion of the fixing portion 32 that exceeds the surface of the first waterproof edge 11 facing the top cover 20 is less than the initial thickness of the sealing ring 50, so that the portion of the fixing portion 32 that exceeds the surface of the first waterproof edge 11 facing the top cover 20 can limit the second waterproof edge 21 to a preset position relative to the first waterproof edge 11, preventing the first waterproof edge 11 from continuing to squeeze the sealing ring 50, and thus preventing the interaction force between the fixing structure 30 and the matching member 40 from exceeding a certain value, thereby preventing the fixing structure 30 and the matching member 40 or the first waterproof edge 11 and the second waterproof edge 21 from being damaged by excessive force.

[0099] In some embodiments, portions of the two fixing portions 32 pass through and exceed the surface of the first waterproof edge 11 facing the top cover 20. For example, a portion of the fixing body 321 may exceed the surface of the first waterproof edge 11 facing the top cover 20 to limit the relative position between the second waterproof edge 21 and the first waterproof edge 11 to not be less than a certain value.

[0100] In some embodiments, a via hole is opened on the sealing ring 50, and the via hole is opposite to the through hole 111. Part of the fixing portion 32 exceeds the through hole 111 and is located inside the via hole, and does not exceed the via hole in a natural state, that is, the via hole of the sealing ring 50 when not squeezed.

[0101] In some embodiments, the fastening hole 311 is a threaded hole, and the fitting 40 is a screw, which passes through the second waterproof edge 21 and the sealing ring 50 and is connected to the threaded hole to achieve a fixed connection between the second waterproof edge 21 and the first waterproof edge 11 .

[0102] Fig.10 for Figure 3 A partially enlarged cross-sectional view of a portion of the structure of the sealed box body 5a. Fig.10 It mainly shows the specific structures of the first waterproof edge 11 and the second waterproof edge 21 and their connection relationship with the fixed structure 30 .

[0103] Reference Fig.10 In some embodiments, the first waterproof edge 11 includes a first folded edge 112 bent from the side wall 12 of the box body 10, a second folded edge 113 bent from the first folded edge 112, and a third folded edge 114 bent from the second folded edge 113. The first folded edge 112 and the third folded edge 114 are located on the same side of the second folded edge 113, and the first folded edge 112 is bent toward the inner cavity of the box body 10. The width direction Y of the first waterproof edge 11 in this embodiment refers to the width direction of the folded edge provided with the fixing structure 30. For example, the width direction of the third folded edge 114 provided with the fixing structure 30 is the width direction Y of the first waterproof edge 11 in this embodiment. In the present embodiment, by bending the first folded edge 112 toward the inner cavity direction of the box body 10, the box body 10 can be miniaturized as much as possible in the width direction, and the groove 115 toward the inner side of the box body 10 formed by bending the first folded edge 112, the second folded edge 113 and the third folded edge 114 and the cooperation of the second waterproof edge 21 can play a role in reducing the water pressure, so that the water pressure at the position between the first waterproof edge 11 and the second waterproof edge 21 is greatly reduced, and thus it is impossible for the water to enter the box body 10 from between the first waterproof edge 11 and the second waterproof edge 21, so as to improve the sealing performance of the sealed box body 5a in the present embodiment.

[0104] In some embodiments, the side wall 12 of the box body 10 and the first folded edge 112 are approximately 90 degrees, the first folded edge 112 and the second folded edge 113 are approximately 90 degrees, and the second folded edge 113 and the third folded edge 114 are approximately 90 degrees. In this way, the processing of the first waterproof edge 11 is convenient, and the third folded edge 114 is conveniently kept approximately perpendicular to the side wall 12 of the box body 10, so as to facilitate the assembly with the second waterproof edge 21.

[0105] In some embodiments, the top cover 20 includes a top wall 22 and a second waterproof edge 21 connected to the periphery of the top wall 22, the second waterproof edge 21 includes a fourth folded edge 211 bent from the top wall 22 of the top cover 20, a fifth folded edge 212 bent from the fourth folded edge 211, and a sixth folded edge 213 bent from the fifth folded edge 212, and the fourth folded edge 211 and the sixth folded edge 213 are located on opposite sides of the fifth folded edge 212. The width direction of the second waterproof edge 21 in this embodiment refers to the width direction of the folded edge provided with the matching piece 40, for example, the width direction of the fifth folded edge 212 provided with the matching piece 40 is the width direction Y of the first waterproof edge 11 in this embodiment.

[0106] In some embodiments, the fourth folded edge 211 is bent toward the box body 10 so that the fifth folded edge 212 is lower than the top wall 22 in the height direction of the box body 10. Therefore, when a fitting 40 is provided on the fifth folded edge 212, it is possible to avoid the fitting 40 protruding from the top wall 22 or reduce the length of the fitting 40 protruding from the top wall 22 to ensure the overall flatness of the sealed box body 5a, so as to facilitate integration with other sealed box bodies 5a.

[0107] In some embodiments, the top wall 22 of the top cover 20 and the fourth folded edge 211 are approximately 90 degrees, the fourth folded edge 211 and the fifth folded edge 212 are approximately 90 degrees, and the fifth folded edge 212 and the sixth folded edge 213 are approximately 90 degrees. In this way, the processing of the second waterproof edge 21 is convenient, and the fifth folded edge 212 is conveniently kept substantially perpendicular to the side wall 12 of the box body 10, so as to facilitate the assembly with the first waterproof edge 11.

[0108] In some embodiments, the third folded edge 114 and the fifth folded edge 212 are stacked, the fixing portion 32 is fixed to the third folded edge 114, and the fitting 40 passes through the fifth folded edge 212 and is connected to the fastening hole 311. In this embodiment, since the size of the fixing structure 30 in the width direction Y of the first waterproof edge 11 (that is, in the width direction of the third folded edge 114) is small enough, the feasibility of simultaneously connecting the sealing ring 50 and the fixing structure 30 to the third folded edge 114 is improved, so that no additional intermediate piece is required. In addition, since the fixing portion 32 exceeds the surface of the third folded edge 114 facing the fifth folded edge 212, the fixing portion 32 can limit the relative position of the third folded edge 114 and the fifth folded edge 212, which can avoid The extrusion transition of the sealing ring 50 can also avoid damage to the fixed structure 30 and the matching part 40, and there is no need to form a recessed groove for limiting the installation of the matching part 40 on the fifth folded edge 212 in advance (the recessed groove is usually larger than the radial dimension of the matching part 40). Under the limitation of the groove 115, the matching part 40 cannot be arranged as close to the fifth folded edge 212 as possible, and the fixed structure 30 cannot be arranged as close to the third folded edge 114 as possible, which also results in the sealing ring 50 and the fixed structure 30 cannot be arranged on the third folded edge 114 at the same time. In this embodiment, by reducing the size of the fixed structure 30 in the width direction Y of the first waterproof edge 11 and the limiting effect brought by the fixed structure 30 exceeding the surface of the third fold edge 114 toward the fifth fold edge 212, the fixed structure 30 can be arranged as close to the edge of the third fold edge 114 as possible. In the width direction of the third fold edge 114, the third fold edge 114 can accommodate the fixed structure 30 and the sealing ring 50 at the same time, so that the installation of intermediate parts can be avoided, which not only saves costs but also simplifies the difficulty of assembly.

[0109] In some embodiments, the sixth folded edge 213 and the second folded edge 113 are substantially parallel, and at least partially overlap in the width direction of the box body 10. Thus, the sixth folded edge 213 can block a portion of the entrance of the groove 115 toward the inner side of the box body 10 formed by bending the first folded edge 112, the second folded edge 113 and the third folded edge 114, thereby reducing the water pressure. When the water flows to the position between the third folded edge 114 and the fifth folded edge 212, most of the water pressure can be released, thereby effectively improving the sealing performance of the sealed box body 5a.

[0110] It is understandable that in some other embodiments, the second waterproof edge 21 may also remove the fourth folded edge 211 , and directly connect the fifth folded edge 212 to the top wall 22 of the top cover 20 and keep it parallel to the top wall 22 .

[0111] It is understandable that in some other embodiments, the first waterproof edge 11 may also remove the second folded edge 113 and the third folded edge 114, and directly connect the first folded edge 112 with the fifth folded edge 212 of the second waterproof edge 21. Of course, in some other embodiments, the specific structures of the first waterproof edge 11 and the second waterproof edge 21 may also be set according to needs.

[0112] Fig.11 This is a schematic diagram of another fixing structure 30 provided in an embodiment of the present application. Fig.11 Although the limiting portion 70 in the embodiment is connected to the fixing structure 30, it is not a part of the fixing structure 30. It should also be noted that: Fig.11 is based on Figure 5 Another structural diagram of the expansion of the fixed structure 30, Fig.11 The fixing structure 30 also includes a fixing portion 32 and a main body portion 31 .

[0113] Reference Fig.11 In some embodiments, the fixing structure 30 further includes a substrate 60 in the shape of an elongated strip, and the substrate 60 is connected to the radial outer peripheral surface of the main body 31 in a surrounding manner. The substrate 60 is used to engage with the first waterproof edge 11 in the height direction of the box body 10 (also in the axial direction Z of the fastening hole 311) to prevent the fixing structure 30 from being separated from the first waterproof edge 11. The fixing portion 32 is a fixing hole 61 provided on the substrate 60, and an assembly hole connected to the fixing hole 61 is provided on the first waterproof edge 11. The fixing hole 61 and the assembly hole are used to be connected by fasteners, such as connecting the fixing hole 61 and the assembly hole together by bolts. In this embodiment, since the fixing portion 32 is a fixing hole 61 provided on the substrate 60, the size of the fixing hole 61 in the width direction Y of the first waterproof edge 11 is smaller than the outer diameter size of the main body 31. The connection method of the fixing structure 30 and the first waterproof edge 11 in this embodiment is different from the riveting connection method of the fixing portion 32 and the first waterproof edge 11 in the previous embodiment. In this embodiment, since the fixing portion 32 is a fixing hole 61 opened on the substrate 60, the substrate 60 can be fixed to the first waterproof edge 11 through the cooperation of the fixing hole 61 with the assembly hole and the fastener, and then the main body 31 can be fixed to the first waterproof edge 11.

[0114] In some embodiments, the inner diameter of the fixing hole 61 is smaller than or equal to the inner diameter of the fastening hole 311. Since the inner diameter of the fixing hole 61 is smaller than the inner diameter of the fastening hole 311, the size of the substrate 60 in the width direction Y of the first waterproof edge 11 required to open the fixing hole 61 can be smaller than the outer diameter of the main body 31. Thus, the size of the substrate 60 in the width direction Y of the first waterproof edge 11 can be effectively reduced.

[0115] In some embodiments, a limiting portion 70 is protruded on a side of the substrate 60 facing the first waterproof edge 11, and the limiting portion 70 passes through and exceeds the surface of the first waterproof edge 11 facing the top cover 20, for example, the height of the portion of the limiting portion 70 that exceeds the surface of the first waterproof edge 11 facing the top cover 20 is less than the initial thickness of the sealing ring 50. In this embodiment, since the limiting portion 70 passes through and exceeds the surface of the first waterproof edge 11 facing the top cover 20, the height of the portion of the limiting portion 70 that exceeds the surface of the first waterproof edge 11 facing the top cover 20 is less than the initial thickness of the sealing ring 50, so that the portion of the limiting portion 70 that exceeds the surface of the first waterproof edge 11 facing the top cover 20 can limit the second waterproof edge 21 relative to the first waterproof edge 11 at a preset position, preventing the first waterproof edge 11 from continuing to squeeze the sealing ring 50, and thus preventing the interaction force between the fixed structure 30 and the matching member 40 from exceeding a certain value, thereby preventing the fixed structure 30 and the matching member 40 or the first waterproof edge 11 and the second waterproof edge 21 from being damaged by excessive force.

[0116] In some embodiments, the dimension of the first waterproof edge 11 of the limiting portion 70 in the width direction Y is less than or equal to the outer diameter of the main body 31 .

[0117] In some embodiments, a dimension of the first waterproof edge 11 of the limiting portion 70 in the width direction Y is smaller than or equal to an inner diameter of the fastening hole 311 .

[0118] In some embodiments, the limiting portions 70 are located on both sides of the fastening hole 311 in the length direction X of the first waterproof edge 11 .

[0119] It can be understood that the shape of the limiting portion 70 in this embodiment is not specifically limited.

[0120] Fig. 12A A structural diagram of another fixing structure 30 provided in an embodiment of the present application; when necessary, Fig. 12A Although the limiting portion 70 is connected to the fixing structure 30 , it is not a part of the fixing structure 30 . Fig. 12B for Fig. 12A The fixed structure 30 in FIG. 1 is a schematic diagram of the structure of the first waterproof edge 11. It should also be noted that: Fig. 12A is based on Figure 5 Another structural diagram of the expansion of the fixed structure 30, Fig. 12A The fixing structure 30 also includes a fixing portion 32 and a main body portion 31 .

[0121] Reference Fig. 12A and Fig. 12BIn some embodiments, the fixing structure 30 further includes a substrate 60 in the form of an elongated strip. The substrate 60 is connected to the radial outer peripheral surface of the main body 31 in a surrounding manner. The substrate 60 is stacked on the side of the first waterproof edge 11 away from the top cover 20. The substrate 60 is welded to the first waterproof edge 11. The fixing portion 32 is the portion where the substrate 60 and the first waterproof edge 11 are welded. The connection method between the fixing structure 30 and the first waterproof edge 11 in this embodiment is also different from the method of riveting the fixing portion 32 and the first waterproof edge 11 in the previous embodiment. In this embodiment, the substrate 60 is fixed to the first waterproof edge 11 by welding the fixing portion 32 to the first waterproof edge 11, for example, Fig. 12B The position corresponding to the reference numeral 116 on the side where the first waterproof edge 11 contacts the substrate 60 is welded to the fixing portion 32 , thereby fixing the main body 31 to the first waterproof edge 11 .

[0122] In some embodiments, a limiting portion 70 is protruded on one side of the substrate 60 facing the first waterproof edge 11, and the limiting portion 70 passes through and exceeds the surface of the first waterproof edge 11 facing the top cover 20. The height of the portion of the limiting portion 70 that exceeds the surface of the first waterproof edge 11 facing the top cover 20 is less than the initial thickness of the sealing ring 50. The specific effect of this embodiment can be referred to Fig.11 The limiting portion 70 in the embodiment will not be described in detail here.

[0123] Fig.13A This is a schematic structural diagram of another fixing structure 30 provided in an embodiment of the present application. Fig. 13B for Fig.13A A schematic diagram of the structure in which the fixing structure 30 is fixed to the box body 10 and the top cover 20. Fig.13A is based on Figure 5 Another structural schematic diagram of the expansion of the fixed structure 30 in FIG.

[0124] Reference Fig.13A and Fig. 13B In some embodiments, the sealed box body 5a includes a box body 10, a top cover 20, a sealing ring 50, and a fixing structure 30 and a matching piece 40 for fixing the box body 10 and the top cover 20, the box body 10 includes a first waterproof edge 11, the top cover 20 includes a second waterproof edge 21, and the sealing ring 50 is located between the first waterproof edge 11 and the second waterproof edge 21; wherein, the box body 10, the top cover 20, the sealing ring 50, the first waterproof edge 11, the second waterproof edge 21, etc. can all refer to the previous embodiments and will not be repeated here.

[0125] In some embodiments, the fixing structure 30 includes a long strip-shaped substrate 81, a fixing portion 82 protruding from one side of the substrate 81, and a main body portion 83 protruding from a side of the fixing portion 82 away from the substrate 81, the main body portion 83 is a screw structure, the dimension of the fixing portion 82 in the length direction X of the first waterproof edge 11 is larger than the dimension in the width direction Y of the first waterproof edge 11, and the maximum dimension of the fixing portion 32 in the width direction X of the first waterproof edge 11 is less than or equal to the outer diameter of the mating piece 40, for example, the mating piece 40 is a nut.

[0126] In some embodiments, a through hole 111 is provided on the first waterproof edge 11, the substrate 81 is stacked on the side of the first waterproof edge 11 away from the top cover 20, and the fixing portion 82 passes through the through hole 111 and protrudes from the surface of the first waterproof edge 11 facing the top cover 20, for example, the height of the fixing portion 82 protruding from the surface of the first waterproof edge 11 facing the top cover 20 is less than the initial thickness of the sealing ring 50. In this embodiment, by setting the size of the fixing portion 82 in the length direction X of the first waterproof edge 11 to be greater than the size in the width direction Y of the first waterproof edge 11, the size of the fixing portion 32 in the width direction Y of the first waterproof edge 11 can be effectively reduced, and the space occupied by the fixing portion 32 in the width direction of the first waterproof edge 11 can be effectively reduced, thereby reducing the width of the first waterproof edge 11. In this way, the width of the first waterproof edge 11 is effectively reduced, so as to achieve miniaturization of the sealed box 5a.

[0127] In some embodiments, the fitting 40 is a nut, and the main body 83 passes through the first waterproof edge 11 and the second waterproof edge 21 and is connected to the nut, thereby achieving connection between the fixing structure 30 and the fitting 40. The first waterproof edge 11 and the second waterproof edge 21 are fixedly connected.

[0128] In some embodiments, the fixing portion 32 has rivet grooves 3211 at both ends of the first waterproof edge 11 in the length direction X (see Figure 5 The fixing portion 32 may be a fixing hole 61 (see FIG. 1 ) formed on the substrate 81 and connected to the first waterproof edge 11 by riveting through the riveting groove 3211. Fig.11 For example, in some embodiments, the fixing portion 32 is a portion of the substrate 81 used for welding with the first waterproof edge 11 (see Fig. 12A The fixing portion 32).

[0129] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A sealed box, characterized in that: The sealed box body comprises a box body, a top cover and a fixing structure for fixing the top cover to the box body; the box body comprises a first waterproof edge, the first waterproof edge comprises a length direction and a width direction, the fixing structure comprises a main body provided with a fastening hole and a fixing part connected to the main body, the fixing part is used to fix the fixing structure to the first waterproof edge, the axial direction of the fastening hole is perpendicular to the length direction of the first waterproof edge and the width direction of the first waterproof edge, and the length direction of the first waterproof edge is perpendicular to the width direction of the first waterproof edge; The fixing portion and the main body are arranged along the length direction of the first waterproof edge, and the maximum dimension of the portion of the fixing portion in contact with the first waterproof edge in the width direction of the first waterproof edge is less than or equal to the outer diameter of the main body.

2. The sealed box according to claim 1, characterized in that: The number of the fixing parts is two, and the two fixing parts are located on two opposite sides of the fastening hole in the length direction of the first waterproof edge.

3. The sealed box according to claim 1 or 2, characterized in that: In the length direction of the first waterproof edge, a rivet groove is provided on a side of the fixing portion away from the fastening hole, and the rivet groove is used to connect the fixing portion with the first waterproof edge by rivet.

4. The sealed box according to claim 3, characterized in that: The first waterproof edge is provided with a through hole connected with the fastening hole, the fixing portion passes through the through hole, and the dimension of the through hole in the width direction of the first waterproof edge is larger than the dimension of the fixing portion in the width direction of the first waterproof edge.

5. The sealed box according to claim 3, characterized in that: The sealed box body also includes a sealing ring, and the top cover includes a second waterproof edge. The sealing ring is located between the first waterproof edge and the second waterproof edge. The first waterproof edge is provided with a through hole connected to the fastening hole, and the fixing portion passes through the through hole and protrudes from the surface of the first waterproof edge toward the top cover.

6. The sealed box according to claim 5, characterized in that: The fixing structure also includes a substrate, which is connected to the radial outer peripheral surface of the main body in a surrounding manner, the fixing part is connected to the surface of the substrate along the axial direction of the main body facing the top cover, and the substrate is stacked on the side of the first waterproof edge away from the top cover.

7. The sealed box according to claim 1 or 2, characterized in that: The fixing structure also includes a base plate, which is connected to the radial outer peripheral surface of the main body in a surrounding manner, and the base plate is stacked on the side of the first waterproof edge away from the top cover. The fixing part is a fixing hole opened on the base plate, and the first waterproof edge is provided with an assembly hole connected to the fixing hole, and the fixing hole and the assembly hole are used to be connected by fasteners.

8. The sealed box according to claim 7, characterized in that: The sealed box body also includes a sealing ring, the top cover includes a second waterproof edge, the sealing ring is located between the first waterproof edge and the second waterproof edge, a limiting portion protrudes on the side of the substrate facing the first waterproof edge, a through hole connected to the fastening hole is provided on the first waterproof edge, and the limiting portion passes through the through hole and protrudes from the surface of the first waterproof edge facing the top cover.

9. The sealed box according to claim 1 or 2, characterized in that: The fixing structure also includes a substrate, which is connected to the radial outer peripheral surface of the main body in a surrounding manner, and the substrate is stacked on the side of the first waterproof edge away from the top cover. The substrate is welded to the first waterproof edge, and the fixing part is the part where the substrate and the first waterproof edge are welded.

10. The sealed box according to claim 1 or 2, characterized in that: The first waterproof edge includes a first folded edge bent from the side wall of the box body, a second folded edge bent from the first folded edge, and a third folded edge bent from the second folded edge, and the first folded edge and the third folded edge are located on the same side of the second folded edge; The top cover includes a second waterproof edge, the second waterproof edge includes a fourth folded edge bent from the top wall of the top cover, a fifth folded edge bent from the fourth folded edge, and a sixth folded edge bent from the fifth folded edge, the fourth folded edge and the sixth folded edge are located on two opposite sides of the fifth folded edge, and the third folded edge and the fifth folded edge are stacked; The fixing portion is fixed to the third folded edge, and the sealed box body further comprises a fitting member, which passes through the fifth folded edge and is connected to the fastening hole.

11. A sealed box, characterized in that: The sealed box body comprises a box body, a top cover, a sealing ring, and a fixing structure and a matching piece for fixing the box body and the top cover, the box body comprises a first waterproof edge, the top cover comprises a second waterproof edge, and the sealing ring is located between the first waterproof edge and the second waterproof edge; The first waterproof edge includes a length direction and a width direction, the fixing structure includes a substrate, a fixing portion protruding from one side of the substrate, and a main body protruding from a side of the fixing portion away from the substrate, the main body is a screw structure, the dimension of the fixing portion in the length direction of the first waterproof edge is greater than the dimension in the width direction of the first waterproof edge, and the maximum dimension of the fixing portion in the width direction of the first waterproof edge is less than or equal to the outer diameter of the mating piece.

12. The sealed box according to claim 11, characterized in that: The first waterproof edge is provided with a through hole, the substrate is stacked on a side of the first waterproof edge away from the top cover, and the fixing portion passes through the through hole and protrudes from a surface of the first waterproof edge facing the top cover.

13. The sealed box according to claim 11 or 12, characterized in that: The fixing portion is provided with rivet grooves at both ends of the first waterproof edge in the length direction, and the rivet grooves are used for riveting connection with the first waterproof edge.

14. The sealed box according to claim 11 or 12, characterized in that: The length direction of the substrate is the same as the length direction of the first waterproof edge. Two fixing holes for fixing to the first waterproof edge are provided at both ends of the length direction of the substrate. The two fixing holes are located on two radially opposite sides of the main body, and the inner diameters of the two fixing holes are both smaller than the outer diameter of the main body.

15. A battery pack, characterized in that: The battery pack comprises a battery cell and a sealed box as described in any one of claims 1 to 14, wherein the battery cell is arranged in the sealed box.

16. An energy storage device, characterized in that: The energy storage device includes a cabinet and a plurality of battery packs as described in claim 15 located in the cabinet.

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