End cover assembly, energy storage device and electrical equipment

Abstract

End cover assembly, energy storage device and electrical equipment. The end cover assembly includes a top cover, an insulating member, a pole column and a riveting member; the top cover is formed with a first through hole; the insulating member is installed on the top cover, the orthographic projection of the insulating member is a rounded rectangle, and includes a second through hole and a plurality of first convex portions, the plurality of first convex portions are arranged on the first surface, and the plurality of first convex portions are arranged around the second through hole; the pole column includes a column body portion and a second convex portion, the orthographic projection of the column body portion is a rounded rectangle, the column body portion passes through the first through hole and the second through hole and protrudes from the first surface, and the second convex portion protrudes from the outer peripheral surface of the column body portion and is located on one side of the column body portion protruding from the first surface; the orthographic projection of the riveting member is a rounded rectangle, and includes a plurality of first grooves, the plurality of first grooves are arranged on the second surface of the riveting member, the first convex portions are received in the first grooves, the riveting member is sleeved on the column body portion, and the column body portion and the insulating member are riveted and fixed to the top cover through the riveting member. Along the thickness direction of the riveting member, the riveting member is located between the insulating member and the second convex portion.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular, to an end cap assembly, an energy storage device, and an electrical device. Background Art

[0002] In the related art, an upper plastic part is injection-molded to realize the assembly of an end cap, a pole column, a seal, and the upper plastic part, so as to obtain a completed end cap assembly. However, since the injection-molded upper plastic part needs to be cooled, the assembly time of the end cap assembly is long and the assembly efficiency is low. Summary of the Invention

[0003] The present application provides an end cap assembly, an energy storage device, and an electrical device.

[0004] In a first aspect, an embodiment of the present application provides an end cap assembly, which includes a top cover, an insulating part, a pole column, and a riveting part; the top cover is formed with a first through hole; the insulating part is installed on the top cover, and the orthographic projection of the insulating part on a plane perpendicular to the thickness direction of the insulating part is a rounded rectangle. The insulating part includes a second through hole and a plurality of first protrusions. The second through hole is opposite to the first through hole. The plurality of first protrusions are arranged at the corners of the first surface of the insulating part. The first surface is the surface of the insulating part facing away from the top cover. The plurality of first protrusions are arranged around the second through hole; the pole column includes a column body part and a second protrusion. The orthographic projection of the column body part on a plane perpendicular to the thickness direction of the column body part is a rounded rectangle. The column body part passes through the first through hole and the second through hole and protrudes from the first surface. The second protrusion protrudes from the outer peripheral surface of the column body part and is located on one side where the column body part protrudes from the first surface; the orthographic projection of the riveting part on a plane perpendicular to the thickness direction of the riveting part is a rounded rectangle. The riveting part includes a plurality of first grooves corresponding to the plurality of first protrusions one by one. The plurality of first grooves are arranged at the corners of the second surface of the riveting part. The second surface is the surface of the riveting part facing the insulating part. The first protrusion is received in the first groove. The riveting part is sleeved on the column body part. The column body part and the insulating part are riveted and fixed to the top cover through the riveting part. Along the thickness direction of the riveting part, the riveting part is located between the insulating part and the second protrusion.

[0005] In a possible implementation, the first protrusion is arranged at the edge of the peripheral wall of the first surface close to the second through hole. The riveting part includes a third through hole, the third through hole is opposite to the second through hole, and the first groove is arranged at the edge of the peripheral wall of the second surface close to the third through hole.

[0006] The first convex portion is located at the edge of the peripheral wall of the second through hole close to the first surface, and the first groove is located at the edge of the peripheral wall of the second through hole close to the third through hole. After the first convex portion is accommodated in the first groove, the insulating part and the rivet part can be firmly connected near the peripheral edge of the second through hole, effectively preventing the insulating part and the rivet part from warping at the abutment points at the four corners of the second through hole, thereby affecting the sealing of the connection between the column part and other components, and preventing leakage of the energy storage device.

[0007] In a possible implementation manner, the plurality of first protrusions are diagonally distributed on the first surface, and the plurality of first grooves are diagonally distributed on the second surface.

[0008] The four corners of the insulating part are provided with first protrusions, and the four corners of the rivet are provided with first grooves. The diagonally distributed first protrusions and first grooves can effectively press the diagonal positions of the rivet and the insulating part to prevent the diagonal positions of the rivet and the insulating part from warping, ensuring that the rivet and the insulating part are relatively flat after pressing, better improving the sealing performance of the end cover assembly at the column part, and preventing electrolyte leakage. In addition, under the premise of ensuring that the rivet and the insulating part can be tightly pressed to prevent warping, the first protrusions and the first grooves can be effectively reduced, effectively saving costs.

[0009] In a possible implementation manner, the first protrusion is adapted to the first groove, the first protrusion includes a first end and a second end opposite to each other, the first end abuts against the first surface, the first protrusion extends from the second end toward the first end in a radial direction of the second end, the first protrusion includes a first plane, a second plane and a first arc surface connected in sequence, the extension directions of the first plane, the second plane and the first arc surface are different from each other, the first plane, the second plane and the first arc surface enclose the circumference of the first protrusion, the bottom edge of the first arc surface is flush with the side wall of the second through hole, the bottom edge of the first arc surface is located on the first surface, the first plane, the second plane and the end of the first arc surface facing away from the first surface form the second end; the rivet includes a third through hole, and the first groove is connected to the third through hole.

[0010] The first end of the first protrusion is triangular in shape, and the first protrusion and the first groove are adapted, that is, the side wall of the first groove fits tightly with the side wall of the first protrusion, and after the first protrusion is inserted into the first groove, the second end of the first protrusion fits tightly with the top of the first groove, so that the first protrusion can be stably assembled in the first groove, and after the insulating part and the column part are riveted to the top cover by the rivet, the first protrusion can be stably limited in the first groove, ensuring the stability of the connection between the first protrusion and the first groove, and strengthening the connection strength between the rivet and the insulating part at the corner.

[0011] In a possible implementation manner, the cross-sectional area of ​​the first protrusion cut along a plane perpendicular to the thickness direction of the insulating member gradually decreases in the direction from the first end to the second end, and the minimum cross-sectional area of ​​the first protrusion cut along a plane perpendicular to the thickness direction of the insulating member is equal to 0.

[0012] In the direction from the first end to the second end, the cross-sectional area of ​​the first convex portion decreases successively, and the area enclosed by the side wall of the first groove also decreases successively, that is, the first convex portion is a peak-shaped structure, and the outer peripheral wall of the first convex portion fits the peripheral wall of the first groove. The first convex portion of the peak-shaped structure can be inserted into the first groove along the side wall of the first groove, which can play a guiding role and improve the installation efficiency. After the first convex portion of the peak-shaped structure is accommodated in the first groove, the first convex portion can be stably assembled in the first groove, effectively improving the stability of the fit between the insulating part and the rivet part, and improving the sealing performance of the end cover assembly in the column part.

[0013] In a possible implementation manner, a thickness of the first protrusion along a thickness direction of the insulating member is greater than a depth of the first groove along a thickness direction of the rivet member.

[0014] Before riveting with the rivet parts, the four corners of the insulating part are higher than the flat edges of the insulating part. During riveting, the corners of the insulating part and the rivet parts are placed correspondingly at the corners of the column part, so that the four corners of the column part are subjected to greater riveting pressure, and the deformation of the four corners of the column part is also greater, so that there is a margin to fill the gap between the arc edges at the corners of the column part.

[0015] In a possible implementation manner, the compression rivet includes a third surface opposite to the second surface, the first groove is formed from the second surface toward the third surface, and a third convex portion opposite to the first groove is formed on the third surface.

[0016] Since the thickness of the rivet is relatively thin, it is difficult to punch out a groove at the corner of the rivet without forming a convex portion. Instead, a first groove is formed by being recessed from the second surface toward the third surface at the corner of the rivet, and a third convex portion opposite to the first groove is raised on the third surface. In other words, a folding process is performed at the corner of the rivet, which simplifies the manufacturing process of the rivet.

[0017] In a possible implementation manner, the pole also includes a flange portion, the column portion is installed on the flange portion, the flange portion is located on the side of the top cover away from the insulating member, a fourth surface of the column portion is formed with a plurality of fourth protrusions, the fourth surface is the surface of the column portion on the side away from the flange portion, and the plurality of fourth protrusions protrude from the fourth surface and are respectively located at the corners of the fourth surface.

[0018] The orthographic projection of the cylindrical part on a plane perpendicular to the thickness direction of the pole column is a rounded rectangle, that is, the outer peripheral side of the cylindrical part is a rounded rectangle, and fourth convex parts are formed at the four corners of the cylindrical part. When the cylindrical part is stamped by a riveting part, the riveting part can abut against the fourth convex parts, so that the cylindrical part has a larger deformation amount during stamping, so that the range of outward extension at the four corners of the cylindrical part is larger than the range of outward extension at the four flat sides of the cylindrical part, so as to better press-fit the four corners of the riveting part and the insulating part, provide greater crimping strength, prevent the corners of the riveting part and the insulating part from warping, and thus provide better sealing performance.

[0019] In a possible implementation manner, the vertical distance between the highest point of the fourth convex part in the thickness direction of the cylindrical part and the fourth surface is H, and the vertical distance H satisfies: 0.05 mm ≤ H ≤ 2.45 mm.

[0020] Before the cylindrical part is stamped, if the vertical distance H between the highest point of the fourth convex part in the thickness direction of the cylindrical part and the fourth surface is less than 0.05 mm, when the cylindrical part is stamped by a riveting part, the deformation amounts at the four corners of the cylindrical part are small, the range of outward extension is small, and the outwardly extending part has a low crimping strength for the riveting part and the insulating part; if the vertical distance H between the highest point of the fourth convex part in the thickness direction of the cylindrical part and the fourth surface is greater than 2.45 mm, the height of the fourth convex part is too high. When the cylindrical part is stamped by a riveting part, the deformation amounts at the four corners of the cylindrical part are too large, the range of outward extension is too large, which easily affects the installation of other components in the end cover assembly, and a greater pressure is required when the cylindrical part is stamped by a riveting part, increasing the stamping difficulty. By setting the vertical distance H between the highest point of the fourth convex part in the thickness direction of the cylindrical part and the fourth surface to be greater than or equal to 0.05 mm and less than or equal to 2.45 mm, when the cylindrical part is stamped by a riveting part, the four corners of the cylindrical part have a large deformation amount, so that the outwardly extending part of the fourth convex part after being stamped can tightly press-fit the four corners of the riveting part and the insulating part, provide greater crimping strength for the riveting part, and thus provide better sealing performance.

[0021] In a possible implementation manner, the cylindrical part is formed with a plurality of lugs, the plurality of lugs are arranged at the corners of the end of the cylindrical part away from the flange part, and in the circumferential direction of the cylindrical part, the second convex part is connected to the plurality of lugs.

[0022] When the riveting part is riveted, the riveting part punches the fourth convex part at the four corners of the cylindrical part. Since the height of the fourth convex part is higher than the height of the four flat sides of the cylindrical part, the range of outward deformation extension at the four corners of the cylindrical part is larger than the range of outward deformation extension of the side walls where the four flat sides of the cylindrical part are located. After the riveting part is riveted, four lugs are formed at the positions of the four fourth convex parts of the cylindrical part. In this way, the four lugs formed at the diagonal positions can reliably press the corner positions of the insulating part and the riveting part. Moreover, the second convex part is connected to the multiple lugs in the circumferential direction, and the second convex part and the multiple lugs jointly limit the riveting part and the insulating part, better improving the sealing performance of the end cover assembly and preventing electrolyte leakage. In addition, after the four lugs are pressed, the riveting part and the insulating part are relatively flat and no longer warped, ensuring the effective fit of the top patch installed on the top cover and the top cover.

[0023] A possible implementation manner, the distance between the outer edge of the lug and the side wall of the cylindrical part is greater than the distance between the outer edge of the second convex part and the side wall of the cylindrical part.

[0024] When the riveting part is riveted, since the partial side walls at the diagonal corners of the cylindrical part are thicker and the range of outward deformation extension is larger than the range of outward deformation extension of the side walls where the four side edges of the cylindrical part are located, the distance between the outer edge of the lug and the side wall of the cylindrical part is greater than the distance between the outer edge of the second convex part and the side wall of the cylindrical part. In this way, the lug can better press the connection part at the corner of the riveting part and the insulating part, ensuring that the riveting part and the insulating part can be reliably attached together and improving the sealing performance of the end cover assembly.

[0025] A possible implementation manner, the insulating part includes a body, a first convex ring and a second convex ring. The body is arranged on the top cover. The first convex ring is arranged on the side of the body facing the top cover and is located in the first through hole. The second convex ring is arranged on the side of the first convex ring facing away from the body and is located in the first through hole. The distance between the inner side wall surface of the first convex ring and the peripheral wall of the first through hole is greater than the distance between the inner side wall surface of the second convex ring and the peripheral wall of the first through hole. The first convex ring, the second convex ring and the body enclose to form the second through hole. The end cover assembly further includes a sealing part. The sealing part is sleeved on the cylindrical part and is located in the first through hole. The surface of the second convex ring on the side facing away from the first convex ring abuts against the surface of the sealing part on the side facing the top cover, for making the inner side wall surface of the sealing part abut against the outer peripheral surface of the cylindrical part.

[0026] When assembling the pole, the seal can be sleeved on the column, and then the pole and the seal are assembled on the top cover, wherein the column is provided with a first through hole and partially embedded in the gap between the first convex ring and the second convex ring, and the surface of the second convex ring away from the first convex ring is against the surface of the seal facing the top cover, and the second convex ring can squeeze the seal along the thickness direction of the column, giving the seal an extrusion force along the thickness direction of the column, so that the seal is deformed along the radial direction of the column and against the outer peripheral surface of the column, so that the seal can fit tightly on the outer peripheral surface of the column to seal the outer peripheral surface of the column and the peripheral wall of the first through hole. In the present application, through the matching connection of the first convex part and the first groove, and the limiting of the second convex part and the lug, the rivet and the insulating part are firmly and flatly installed on the side of the top cover away from the flange part, so as to prevent the edges of the rivet and the insulating part from warping up, which causes the sealing performance of the end cover assembly to decrease after the seal ages and hardens under long-term use, and prevent electrolyte leakage.

[0027] In a possible implementation manner, the main body includes a first section and a second section, the first protrusion is arranged on the second section, the second section is arranged on the surface of the first section facing away from the top cover, the inner side wall of the second section is flush with the peripheral wall of the second through hole, the outer peripheral edge of the second section has a second arc surface, and the first section and the second section both surround the second through hole; in the width direction of the insulating part, the width of the first section is greater than the width of the second section, and the width of the second section is greater than the width of the rivet.

[0028] The second section is stacked on the side of the first section close to the second through hole, and the width of the first section is greater than the width of the second section, that is, the thickness of the inner ring part of the insulating member is thicker, and the thickness of the outer ring is thinner. The outer peripheral edge of the second section has a second arc surface, so that the outer peripheral edge of the second section transitions with the arc of the first section, and the first section and the second section protruding from the top cover are in a stepped tower shape that gradually increases from top to bottom. When the top patch is attached later, it can be easily embedded from the upper surface of the pole at both ends, and the positioning is adjusted layer by layer to avoid the excessive height difference between the first section and the second section protruding from the top cover, causing interference and blocking when the top patch is inserted; at the same time, it is prevented that the outer peripheral edge of the body is lifted up due to the pressure of riveting, affecting the subsequent process of attaching the top patch to the top cover. After the rivet is set on the column part, the rivet abuts on the surface of the second section away from the top cover, and the width of the second section is greater than the width of the rivet, so that the rivet presses the body with a larger area.

[0029] In a second aspect, an embodiment of the present application provides an energy storage device, the energy storage device comprising a housing, an electrode assembly and an end cap assembly as described in the first aspect. The housing forms a receiving space, and the receiving space has an opening. The electrode assembly is received in the receiving space. The end cap assembly covers the opening, and the end cap assembly further comprises an adapter, and the electrode assembly is electrically connected to the pole through the adapter.

[0030] In a third aspect, an embodiment of the present application provides an electrical device, wherein the electrical device comprises an energy storage device as described in the second aspect, and the energy storage device supplies power to the electrical device.

[0031] In the end cover assembly, energy storage device and electrical equipment of the present application, when assembling the end cover assembly, the column portion is penetrated with a first through hole to protrude from the top cover, and then the rivet is installed on the first surface of the insulating member, and the insulating member and the rivet are fixedly connected to the top cover by riveting and stamping. The column portion is penetrated with a first through hole and a second through hole and protrudes from the first surface, and there is no need to wait for the cooling time of the injection molding of the insulating member after assembling the top cover and the pole, thereby effectively improving the assembly efficiency and the mass production efficiency of the end cover assembly. In addition, during the processing and forming of the rivet, it is difficult for the arc-shaped corners of the rivet to completely adapt to the arc-shaped corners of the column. After the rivet and the column are assembled, there is a gap between the two at the arc-shaped corners. The four flat sides of the rivet are in contact with the four flat sides of the column. When the rivet is punched on the upper edge of the column, the column is deformed by pressure. The gaps between the rivet and the column at the corners are first filled at the four corners of the column, and then outward along the circumference of the column. Under the condition of the same punching and riveting depth, the pressure applied to the rivet by the four corners of the column after compression and deformation is less than the pressure applied to the rivet by the four flat sides of the column. By providing a plurality of first protrusions at the corners of the insulating member, A plurality of first protrusions extend along the thickness direction of the insulating part, and a plurality of first grooves corresponding to and matching the plurality of first protrusions are formed at the corners of the second surface of the rivet, and the first protrusions are accommodated in the first grooves, so that the connection between the rivet and the insulating part can be tightly pressed at the corner, preventing the rivet and / or the insulating part from warping at the corner, and enhancing the connection stability between the rivet and the insulating part. The rivet is located between the insulating part and the second protrusion, and the second protrusion can press the four flat edges of the rivet to ensure that the rivet and the insulating part can be tightly pressed in the circumferential direction, avoiding the insulating part or the rivet from warping after the rivet connection, thereby affecting the sealing of the end cover assembly and avoiding electrolyte leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0033] Figure 1It is a schematic diagram of an application scenario of an energy storage system provided by an embodiment of the present application;

[0034] Figure 2 It is a three-dimensional structure schematic diagram of an energy storage device provided by an embodiment of the present application;

[0035] Figure 3 It is a three-dimensional exploded structure schematic diagram of an end cap assembly provided by an embodiment of the present application;

[0036] Figure 4 It is a three-dimensional structure schematic diagram of a riveting part in an end cap assembly provided by an embodiment of the present application;

[0037] Figure 5 is Figure 2 A schematic cross-sectional view of the end cap assembly in the energy storage device shown along line V-V;

[0038] Figure 6 is Figure 5 An enlarged schematic view of VI in the end cap assembly shown;

[0039] Figure 7 is Figure 4 An enlarged schematic view of VII in the riveting part shown;

[0040] Figure 8 It is a three-dimensional structure schematic diagram of an insulating part in an end cap assembly provided by an embodiment of the present application;

[0041] Figure 9 is Figure 8 An enlarged schematic view of IX in the riveting part shown;

[0042] Figure 10 It is a schematic cross-sectional structure diagram of a pole column before stamping in an end cap assembly provided by an embodiment of the present application.

[0043] Reference numerals:

[0044] End cover assembly - 10, top cover - 11, first through - hole - 111, insulating part - 12, second through - hole - 121, first convex part - 122, first end - 1221, second end - 1222, first plane - 1223, second plane - 1224, first arc surface - 1225, first surface - 123, body - 124, first branch - 1241, second branch - 1242, second arc surface - 1243, first convex ring - 125, second convex ring - 126, first diagonal - oo1, second diagonal - oo2, pole - column - 13, column part - 131, fourth surface - 1311, lug - 1312, second convex part - 132, flange part - 133, fourth convex part - 134, riveting part - 14, first groove - 141, second surface - 142, third through - hole - 143, third surface - 144, third convex part - 145, third diagonal - oo3, fourth diagonal - oo4, seal - 15, adapter - 16, housing - 20, receiving space - 21, opening - 22, electrode assembly - 30, energy storage device - 100, electrical equipment - 1000, electric energy conversion device - 2000, wind energy conversion device - 3000, vertical distance - H. Detailed implementation manners

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0046] The descriptions of the following embodiments refer to the attached drawings for illustration of specific embodiments in which the present application can be implemented. The directional terms mentioned herein, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer description and understanding of the present application, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0047] In addition, the serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0048] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the energy utilization rate, it is necessary to store one form of energy in the same or converted into another form of energy through a medium or device, and then release it in a specific energy form based on future application needs. Currently, the generation of green electric energy generally relies on photovoltaic, wind power, water potential, etc. However, problems such as strong intermittency and large volatility are common in wind energy and solar energy, which can cause grid instability, insufficient power during peak electricity consumption, and too much power during low electricity consumption. The unstable voltage can also damage the power. Therefore, the problems of "abandoning wind and light" may be caused by insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, energy storage is required. That is, the electric energy is converted into other forms of energy through physical or chemical means and stored, and the energy is converted into electric energy and released when needed. Simply put, energy storage is similar to a large "power bank", which stores electric energy when photovoltaic and wind energy are sufficient and releases the stored power when needed.

[0049] Taking electrochemical energy storage as an example, this solution provides an energy storage device 100. A group of chemical batteries are provided inside the energy storage device 100, which mainly uses the chemical elements in the chemical batteries as the energy storage medium. The charge and discharge process is accompanied by chemical reactions or changes of the energy storage medium. Simply put, the electric energy generated by wind energy and solar energy is stored in the chemical batteries, and the stored electricity is released for use when the external electricity consumption reaches the peak, or transferred to places with a shortage of electricity for further use.

[0050] Currently, the application scenarios of energy storage (i.e., energy storage) are relatively extensive, including energy storage on the (wind and light) power generation side, grid side, base station side, and user side, etc. The types of corresponding energy storage devices 100 include:

[0051] (1) Large energy storage containers applied in the grid-side energy storage scenario can serve as high-quality active and reactive power regulation power sources in the grid, realizing load matching of electric energy in time and space, enhancing the consumption capacity of renewable energy, and being of great significance in grid system standby, relieving the power supply pressure during peak loads, and peak shaving and frequency modulation.

[0052] (2) Small and medium-sized energy storage cabinets applied in the industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side mainly operate in the mode of "peak shaving and valley filling". Since there is a large price difference in electricity charges at the peak and valley positions according to the electricity consumption demand, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage cabinet / box during the low electricity price period; during the peak electricity price period, the electricity in the energy storage device is released for use to achieve the purpose of saving electricity charges.

[0053] Such as Figure 1As shown, the energy storage device 100 provided in the embodiment of the present application is applied to an energy storage system, which includes an electric energy conversion device 2000 (photovoltaic panel), a wind energy conversion device 3000 (wind turbine), an electrical equipment 1000 (grid), and an energy storage device 100. The energy storage system also includes an energy storage cabinet, and the energy storage device 100 is installed in the energy storage cabinet and can be installed outdoors. Specifically, the photovoltaic panel can convert solar energy into electric energy during the period of low electricity prices. The energy storage device 100 is used to store the electric energy and supply it to the grid when the electricity price is peak, or to supply power when the grid is powered off / out of power. The wind energy conversion device 3000 (wind turbine) can convert wind energy into electric energy. The energy storage device 100 is used to store the electric energy and supply it to the grid when the electricity price is peak, or to supply power when the grid is powered off / out of power. Among them, the transmission of electric energy can be transmitted using high-voltage cables.

[0054] The number of energy storage devices 100 can be several, and several energy storage devices 100 are connected in series or in parallel. Several energy storage devices 100 are supported and electrically connected by isolation plates (not shown). In this embodiment, "several" refers to two or more. An energy storage box can also be provided outside the energy storage device 100 to accommodate the energy storage device 100.

[0055] It is understandable that the energy storage device 100 may include but is not limited to a single cell, a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device 100 provided in the embodiment of the present application may be but is not limited to the listed products, and may also be other application forms. The embodiment of the present application does not strictly limit the application form of the energy storage device 100. The embodiment of the present application only takes the energy storage device 100 as a multi-core battery as an example for explanation.

[0056] Please combine Figure 5 The energy storage device 100 includes a housing 20, an electrode assembly 30, and an end cap assembly 10 provided in an embodiment of the present application. The housing 20 is formed with a receiving space 21, and the receiving space 21 has an opening 22. The electrode assembly 30 is received in the receiving space 21, and the end cap assembly 10 covers the opening 22. The end cap assembly 10 also includes an adapter 16, and the electrode assembly 30 is electrically connected to the pole 13 through the adapter 16.

[0057] One end of the adapter 16 is connected to the electrode assembly 30 , and the other end of the adapter 16 is connected to the flange portion 133 of the pole 13 , thereby achieving electrical connection between the electrode assembly 30 and the pole 13 .

[0058] It can be understood that the energy storage system provided in this application can also be a household energy storage system.

[0059] The electric equipment 1000 provided in the present application includes but is not limited to electric equipment 1000 such as a power grid and a base station.

[0060] See alsoFigure 2 , Figure 3 and Figure 4 , embodiments of the present application provide an end cover assembly 10, which is applied to an energy storage device 100. The end cover assembly 10 includes a top cover 11, an insulating member 12, a pole column 13, and a riveting member 14. The top cover 11 is formed with a first through hole 111. The insulating member 12 is installed on the top cover 11. The orthographic projection of the insulating member 12 on a plane perpendicular to the thickness direction of the insulating member 12 is a rounded rectangle. The insulating member 12 includes a second through hole 121 and a plurality of first protrusions 122. The second through hole 121 is opposite to the first through hole 111. The plurality of first protrusions 122 are disposed at the corners of the first surface 123 of the insulating member 12. The first surface 123 is the surface of the insulating member 12 facing away from the top cover 11. The plurality of first protrusions 122 are arranged around the second through hole 121. The pole column 13 includes a column body portion 131 and a second protrusion 132. The orthographic projection of the column body portion 131 on a plane perpendicular to the thickness direction of the column body portion 131 is a rounded rectangle. The column body portion 131 passes through the first through hole 111 and the second through hole 121 and protrudes from the first surface 123. The second protrusion 132 is disposed on the outer peripheral surface of the column body portion 131 and is located on the side where the column body portion 131 protrudes from the first surface 123. The orthographic projection of the riveting member 14 on a plane perpendicular to the thickness direction of the riveting member 14 is a rounded rectangle. The riveting member 14 includes a plurality of first grooves 141 corresponding to the plurality of first protrusions 122 one by one. The plurality of first grooves 141 are disposed at the corners of the second surface 142 of the riveting member 14. The second surface 142 is the surface of the riveting member 14 facing the insulating member 12. The first protrusion 122 is received in the first groove 141. The riveting member 14 is sleeved on the column body portion 131. The column body portion 131 and the insulating member 12 are riveted and fixed to the top cover 11 through the riveting member 14. Along the thickness direction of the riveting member 14, the riveting member 14 is located between the insulating member 12 and the second protrusion 132.

[0061] It should be noted that the thickness direction of a certain component mentioned in the present application is the first direction A as shown in Figure 3 . The width direction and the radial direction of a certain component are the same, which is the radial direction of the circular hole formed in the pole column 13 as shown in Figure 3 .

[0062] Please refer to Figure 6, in this application, when assembling the end cover assembly 10, the cylindrical portion 131 is passed through the first through hole 111 and protrudes from the top cover 11. Then, the riveting part 14 is installed on the first surface 123 of the insulating part 12, and the insulating part 12 and the riveting part 14 are fixedly connected to the top cover 11 by means of riveting and stamping. Among them, the cylindrical portion 131 passes through the first through hole 111 and the second through hole 121 and protrudes from the first surface 123. There is no need to wait for the cooling time of the injection molding of the insulating part 12 after assembling the top cover 11 and the pole column 13, which effectively improves the assembly efficiency and the mass production efficiency of the end cover assembly 10. In addition, during the processing and forming of the riveting part 14, it is difficult for the arc-shaped corners of the riveting part 14 to perfectly fit the arc-shaped corners of the cylindrical portion 131. After the riveting part 14 and the cylindrical portion 131 are assembled, there are gaps at the arc-shaped corners between the two. The four flat edges of the riveting part 14 abut against the four flat edges of the cylindrical portion 131. When the riveting part 14 is stamped on the upper edge of the cylindrical portion 131, the cylindrical portion 131 is deformed under pressure. The gaps at the four corners between the riveting part 14 and the cylindrical portion 131 are first filled at the four corners of the cylindrical portion 131, and then outward along the circumference of the cylindrical portion 131. Under the condition of the same punching and riveting depth, the pressure exerted on the riveting part 14 by the four corners of the deformed cylindrical portion 131 is less than the pressure exerted on the riveting part 14 by the four flat edges of the cylindrical portion 131. By providing a plurality of first convex portions 122 at the corners of the first surface 123 of the insulating part 12, the plurality of first convex portions 122 extend along the thickness direction of the insulating part 12, and a plurality of first grooves 141 corresponding to the plurality of first convex portions 122 are formed at the corners of the second surface 142 of the riveting part 14. The first convex portions 122 are received in the first grooves 141, so that the connection between the riveting part 14 and the insulating part 12 can be tightly pressed at the corners, preventing the corners of the riveting part 14 and / or the insulating part 12 from warping, strengthening the connection stability between the riveting part 14 and the insulating part 12, and the riveting part 14 is located between the insulating part 12 and the second convex portion 132. The second convex portion 132 can tightly press the four flat edges of the riveting part 14, ensuring that the riveting part 14 and the insulating part 12 can be tightly pressed in the circumferential direction, avoiding the warping of the insulating part 12 or the riveting part 14 after being riveted and connected by the riveting part 14, which affects the sealing performance of the end cover assembly 10 and avoiding the phenomenon of electrolyte leakage.

[0063] Among them, the first surface 123 may be a surface of the insulating part 12 that is farthest from the top cover 11 in the thickness direction. The first through hole 111 and the second through hole 121 being opposite means that when the insulating part 12 is stacked on the top cover 11 in the thickness direction of the insulating part 12, the first through hole 111 and the second through hole 121 are opposite in the thickness direction of the insulating part 12, and the sizes of the first through hole 111 and the second through hole 121 are the same.

[0064] Among them, the shapes of the first through hole 111, the second through hole 121, and the third through hole 143 of the rivet nut 14 are all rounded rectangles. To facilitate the sleeving of the rivet nut 14 on the end of the cylindrical portion 131 away from the top cover 11, the size of the third through hole 143 of the rivet nut 14 is slightly larger than that of the cylindrical portion 131. Moreover, due to the different hardnesses of the metal materials (the cylindrical portion 131 is made of aluminum and the rivet nut 14 is made of steel), when machining the cylindrical portion 131 and the rivet nut 14, it is very difficult to completely match the arc degrees of the corners of the cylindrical portion 131 and the arc degrees of the corners of the third through hole 143 of the rivet nut 14. In most cases, when the rivet nut 14 is sleeved on the cylindrical portion 131, there are slight gaps at the four corners of the cylindrical portion 131 at the four corners of the third through hole 143, and the four flat sides of the rivet nut 14 are basically in contact with the four flat sides of the cylindrical portion 131.

[0065] Exemplarily, when the rivet nut 14 is installed on the first surface 123 of the insulating member 12, the rivet nut 14 and the insulating member 12 are stacked in the thickness direction of the insulating member 12. Among them, the orthographic projection area of the insulating member 12 on the plane perpendicular to the thickness direction of the insulating member 12 is larger than the orthographic projection area of the rivet nut 14 on the plane perpendicular to the thickness direction of the rivet nut 14. In this way, insulation between the top cover 11 and the rivet nut 14 is ensured, and the safety of the energy storage device 100 is improved.

[0066] Please refer to Figure 7 and Figure 8 , exemplarily, the first convex portion 122 is provided at the edge of the peripheral wall of the first surface 123 close to the second through hole 121. The rivet nut 14 includes a third through hole 143, the third through hole 143 is opposite to the second through hole 121, and the first groove 141 is provided at the edge of the peripheral wall of the second surface 142 close to the third through hole 143.

[0067] It can be understood that the third through hole 143 is opposite to both the first through hole 111 and the second through hole 121. After the cylindrical portion 131 and the insulating member 12 are press-riveted to the top cover 11 through the rivet nut 14, the rivet nut 14 is sleeved on the outer peripheral surface of the cylindrical portion 131, and in the thickness direction of the rivet nut 14, the rivet nut 14 is located between the insulating member 12 and the second convex portion 132.

[0068] The cylindrical part 131 penetrates through the first through hole 111, the second through hole 121, and the third through hole 143. The cylindrical part 131 is in contact with the peripheral walls of the first through hole 111, the second through hole 121, and the third through hole 143, so as to reduce the gaps between the cylindrical part 131 and the insulating part 12, and between the cylindrical part 131 and the riveting part 14, and ensure the sealing performance among the cylindrical part 131, the insulating part 12, and the riveting part 14. The first convex part 122 is located near the first surface 123 at the edge of the peripheral wall of the second through hole 121. The first groove 141 is arranged at the edge of the second surface 142 near the peripheral wall of the third through hole 143. After the first convex part 122 is received in the first groove 141, the insulating part 12 and the riveting part 14 can be firmly connected near the periphery of the second through hole 121, effectively preventing the insulating part 12 and the riveting part 14 from warping at the contact position at the periphery of the second through hole 121, which affects the sealing performance of the connection between the cylindrical part 131 and other components, and preventing the energy storage device 100 from leaking liquid.

[0069] Exemplarily, multiple first convex parts 122 are arranged diagonally on the first surface 123, and multiple first grooves 141 are arranged diagonally on the second surface 142.

[0070] Please combine Figure 4 and Figure 8 , two first convex parts 122 are respectively arranged on the first diagonal oo1 of the insulating part 12, and two first convex parts 122 are respectively arranged on the second diagonal oo2 of the insulating part 12. Similarly, two first grooves 141 are respectively arranged on the third diagonal oo3 of the riveting part 14, and two first grooves 141 are respectively arranged on the fourth diagonal oo4 of the riveting part 14. When the riveting part 14 is installed on the first surface 123 of the insulating part 12, the first diagonal oo1 and the third diagonal oo3 are in the same plane and parallel to each other, and the second diagonal oo2 and the fourth diagonal oo4 are in the same plane and parallel to each other.

[0071] The first convex parts 122 and the first grooves 141 arranged diagonally can effectively press the diagonal positions of the riveting part 14 and the insulating part 12, prevent the diagonal positions of the riveting part 14 and the insulating part 12 from warping, ensure that the riveting part 14 and the insulating part 12 are relatively flat after pressing, better improve the sealing performance of the end cover assembly 10 at the cylindrical part 131, and prevent the electrolyte from leaking. In addition, on the premise of ensuring that the riveting part 14 and the insulating part 12 can be tightly pressed to prevent warping, the setting of the first convex parts 122 and the first grooves 141 can be effectively reduced, effectively saving costs.

[0072] Among them, the first diagonal line oo1 connects two corners of the first surface 123, the second diagonal line oo2 connects the other two corners of the first surface 123, the third diagonal line oo3 connects the two corners of a surface of the rivet 14 facing the insulating part 12, and the third diagonal line oo3 connects the other two corners of a surface of the rivet 14 facing the insulating part 12.

[0073] Please combine Figure 7 and Figure 9 , wherein the connection between the first protrusion 122 and the peripheral wall of the second through hole 121 is an arc transition at the corner of the first surface 123 .

[0074] A first protrusion 122 is provided at each corner of the insulating member 12, and a first groove 141 adapted to the first protrusion 122 is provided at each corner of the rivet 14. During the riveting connection of the column portion 131 by the rivet 14, the rivet 14 and / or the insulating member 12 is prevented from lifting up, which causes the sealing of the end cover assembly 10 at the connection of the column portion 131 to decrease, thereby preventing leakage of electrolyte.

[0075] Please combine Figure 9 For example, the first convex portion 122 is adapted to the first groove 141, the first convex portion 122 includes a first end portion 1221 and a second end portion 1222 opposite to each other, the first end portion 1221 abuts against the first surface 123, the first convex portion 122 extends from the second end portion 1222 toward the first end portion 1221 in the radiation direction of the second end portion 1222, the first convex portion 122 includes a first plane 1223, a second plane 1224 and a first arc surface 1225 connected in sequence, the first plane 1223, the second plane 1224 and the first arc surface 1225 are connected in sequence, 24 and the first curved surface 1225 have different extension directions, the first plane 1223, the second plane 1224 and the first curved surface 1225 enclose the circumference of the first convex portion 122, the bottom edge of the first curved surface 1225 is flush with the side wall of the second through hole 121, the bottom edge of the first curved surface 1225 is located on the first surface 123, the first plane 1223, the second plane 1224 and the end of the first curved surface 1225 away from the first surface 123 form a second end portion 1222; the first groove 141 is connected to the third through hole 143.

[0076] The edge of the connection between the first plane 1223 and the second plane 1224 is opposite to the first arc surface 1225 , and there is a gap between the connection between the first plane 1223 and the second plane 1224 on the first surface 123 and the outer edge of the first surface 123 away from the second through hole 121 .

[0077] The adaptation of the first convex portion 122 to the first groove 141 means that the shape of the first convex portion 122 is the same as that of the first groove 141. The first convex portion 122 can be inserted into the first groove 141 along the side wall of the first groove 141, and both the first plane 1223 and the second plane 1224 are in contact with the side wall of the first groove 141.

[0078] The first end portion 1221 of the first convex portion 122 is triangular in shape (where the bottom edge of the first arc surface 1225 is an arc edge), and the first convex portion 122 is adapted to the first groove 141, that is, the side wall of the first groove 141 is closely attached to the side wall of the first convex portion 122. After the first convex portion 122 is inserted into the first groove 141, the first convex portion 122 can be stably assembled in the first groove 141. And after the insulating part 12 and the column part 131 are riveted to the top cover 11 through the riveting part 14, the first convex portion 122 can be stably limited in the first groove 141, ensuring the stability of the connection between the first convex portion 122 and the first groove 141 and strengthening the connection strength between the riveting part 14 and the insulating part 12 at the corner.

[0079] Furthermore, the cross-sectional area of the first convex portion 122 intercepted by a plane perpendicular to the thickness direction of the insulating part 12 gradually decreases in the direction from the first end portion 1221 to the second end portion 1222, and the minimum cross-sectional area of the first convex portion 122 intercepted by a plane perpendicular to the thickness direction of the insulating part 12 is equal to 0.

[0080] In other words, the width of the first convex portion 122 extending along the diagonal (such as the first diagonal oo1 or the second diagonal oo2) gradually decreases in the direction from the first end portion 1221 to the second end portion 1222, and the width of the first groove 141 extending along the diagonal (such as the third diagonal oo3 or the fourth diagonal oo4) also gradually decreases in the direction from the first end portion 1221 to the second end portion 1222.

[0081] In the direction from the first end portion 1221 to the second end portion 1222 (such as Figure 9 the second direction B shown), the cross-sectional area of the first convex portion 122 decreases in sequence, and the area enclosed by the side wall of the first groove 141 also decreases in sequence. That is, the first convex portion 122 has a peak-like structure. The outer peripheral wall of the first convex portion 122 is attached to the peripheral wall of the first groove 141. The peak-like first convex portion 122 can be inserted into the first groove 141 along the side wall of the first groove 141, which can play a guiding role and improve the installation efficiency. And after the peak-like first convex portion 122 is inserted into the first groove 141, the first convex portion 122 can be stably assembled in the first groove 141, effectively improving the stability of the fit between the insulating part 12 and the riveting part 14 and improving the sealing performance of the end cover assembly 10 on the column part 131.

[0082] The thickness of the first convex portion 122 in the thickness direction of the insulating member 12 is greater than the depth of the first groove 141 in the thickness direction of the riveting member 14.

[0083] Among them, the first convex portion 122 has a peak-like structure, and the height of the edge where the connection of the first plane 1223 and the second plane 1224 is located is greater than the depth of the corresponding position in the first groove 141. The difference between the height of this edge and the depth of the corresponding position in the first groove 141 is greater than or equal to 0.01 mm and less than or equal to 0.15 mm, avoiding the difference between the height of this edge and the depth of the corresponding position in the first groove 141 being too large or too small, ensuring that the first convex portion 122 and the first groove 141 can be closely attached, and at the same time, reducing the riveting difficulty of the riveting member 14.

[0084] Before riveting by the riveting member 14, the four corners of the insulating member 12 are higher than the flat edges of the insulating member 12. During riveting, the corners of the insulating member 12 and the riveting member 14 are correspondingly placed at the corners of the column portion 131, so that the four corners of the column portion 131 receive a greater riveting pressure, and the deformation amount of the four corners of the column portion 131 is also larger, and there is a margin to fill the gap between the arc edges at the corners of the column portion 131.

[0085] Exemplarily, the first convex portion 122 can have a rectangular structure, and the side wall of the first convex portion 122 facing the second through hole 121 is flush with the peripheral wall of the second through hole 121, that is, the side wall of the rectangular first convex portion 122 facing the second through hole 121 is an arc-shaped side wall.

[0086] Among the two first convex portions 122 on the first diagonal oo1, the two opposite surfaces of the first convex portion 122 on the first diagonal oo1 are respectively located at the two opposite edges of the first surface 123 on the first diagonal oo1; the distribution of the two first convex portions 122 on the second diagonal oo2 is similar to the distribution of the two first convex portions 122 on the first diagonal oo1, and will not be elaborated. Similarly, among the two first grooves 141 on the third diagonal oo3, the two surfaces of the first groove 141 on the third diagonal oo3 are respectively located at the two opposite edges of the second surface 142 on the third diagonal oo3, and the distribution of the two first grooves 141 on the fourth diagonal oo4 is similar to the distribution of the two first grooves 141 on the third diagonal oo3, and will not be elaborated.

[0087] The rectangular first convex portion 122 and the first groove 141 have a simple manufacturing process and can effectively improve the mass production efficiency of the end cap assembly 10.

[0088] The rivet 14 includes a third surface 144 opposite to the second surface 142 . The first groove 141 is recessed from the second surface 142 toward the third surface 144 . A third protrusion 145 is formed on the third surface 144 opposite to the first groove 141 .

[0089] Since the rivet 14 is relatively thin and is made of steel, it is difficult to punch out a groove at the corner of the rivet 14 without forming a convex portion on the rivet 14. Instead, a first groove 141 is formed at the corner of the rivet 14 by being recessed from the second surface 142 toward the third surface 144, and a third convex portion 145 is formed on the third surface 144 opposite to the first groove 141. That is to say, a folding process is performed at the corner of the rivet 14, so that the manufacturing process of the rivet 14 is simple.

[0090] Please combine Figure 6 and Figure 10 For example, the pole 13 also includes a flange portion 133, the column portion 131 is installed on the flange portion 133, the flange portion 133 is located on the side of the top cover 11 away from the insulating member 12, and a fourth surface 1311 of the column portion 131 is formed with a plurality of fourth protrusions 134. The fourth surface 1311 is a surface of the column portion 131 on the side away from the flange portion 133. The plurality of fourth protrusions 134 protrude from the fourth surface 1311 and are respectively located at the corners of the fourth surface 1311.

[0091] Before the pole 13 is riveted and fixed by the rivet 14 , a plurality of fourth protrusions 134 are formed on the fourth surface 1311 of the column portion 131 .

[0092] It can be understood that the column portion 131 is protruded on the flange portion 133, and the column portion 131 and the flange portion 133 are arranged in sequence, and the flange portion 133 is protruded from the outer periphery of the column portion 131 in a direction perpendicular to the arrangement direction of the column portion 131 and the flange portion 133 (that is, in the thickness direction of the pole 13).

[0093] The orthographic projection of the column portion 131 on a plane perpendicular to the thickness direction of the pole 13 is a rounded rectangle, that is, the outer peripheral side of the column portion 131 is a rounded rectangle, and fourth protrusions 134 are formed at the four corners of the column portion 131. When the column portion 131 is punched by the rivet 14, the rivet 14 can abut against the fourth protrusion 134, so that the column portion 131 has a larger deformation amount when punched, so that the four corners of the column portion 131 extend outwardly to a greater extent than the four flat edges of the column portion 131, so as to better press the four corners of the rivet 14 and the insulating member 12, provide greater crimping strength, prevent the rivet 14 and the insulating member 12 from warping at the corners, and thus provide better sealing performance.

[0094] Among them, the side walls where the four flat sides of the cylindrical portion 131 are located are pressed and extended outward to form a second convex portion 132. The second convex portion 132 abuts against the flat side of the rivet press-fit part 14, so as to limit the four flat sides of the rivet press-fit part 14 and the insulating part 12 between the top cover 11 and the second convex portion 132, preventing the four flat sides of the rivet press-fit part 14 and the insulating part 12 from warping.

[0095] Exemplarily, the vertical distance between the highest point of the fourth convex portion 134 in the thickness direction of the cylindrical portion 131 and the fourth surface 1311 is H, and H satisfies: 0.05 mm ≤ H ≤ 2.45 mm.

[0096] Before the cylindrical portion 131 is stamped, if the vertical distance H between the highest point of the fourth convex portion 134 in the thickness direction of the cylindrical portion 131 and the fourth surface 1311 is less than 0.05 mm, when the cylindrical portion 131 is stamped by the rivet press-fit part 14, the deformation amount at the four corners of the cylindrical portion 131 is small, the outward extension range is small, and the outward extended part has a low crimping strength for the rivet press-fit part 14 and the insulating part 12; if the vertical distance H between the highest point of the fourth convex portion 134 in the thickness direction of the cylindrical portion 131 and the fourth surface 1311 is greater than 2.45 mm, the height of the fourth convex portion 134 is too high. When the cylindrical portion 131 is stamped by the rivet press-fit part 14, the deformation amount at the four corners of the cylindrical portion 131 is too large, the outward extension range is too large, which easily affects the installation of other components in the end cover assembly 10, and a greater pressure is required when the cylindrical portion 131 is stamped by the rivet press-fit part 14, increasing the stamping difficulty. By setting the vertical distance between the highest point of the fourth convex portion 134 in the thickness direction of the cylindrical portion 131 and the fourth surface 1311 to be greater than or equal to 0.05 mm and less than or equal to 2.45 mm, when the cylindrical portion 131 is stamped by the rivet press-fit part 14, the four corners of the cylindrical portion 131 have a large deformation amount, so that the outward extended part of the fourth convex portion 134 after being stamped can tightly press the four corners of the rivet press-fit part 14 and the insulating part 12, providing a greater crimping strength for the rivet press-fit part 14, thereby providing better sealing performance. At the same time, it can also effectively reduce the crimping difficulty and improve the assembly efficiency of the end cover assembly 10.

[0097] Exemplarily, the cylindrical portion 131 is formed with a plurality of lugs 1312. The plurality of lugs 1312 are arranged at the corners of the end of the cylindrical portion 131 away from the flange portion 133. In the circumferential direction of the cylindrical portion 131, the second convex portion 132 is connected to the plurality of lugs 1312.

[0098] When the riveting part 14 is riveted, the riveting part 14 punches the fourth convex part 134 at the four corners of the cylindrical part 131. Since the height of the fourth convex part 134 is higher than that of the flat side of the cylindrical part 131, the range of outward extension and deformation at the four corners of the cylindrical part 131 is larger than that of the side walls where the four flat sides of the cylindrical part 131 are located. After the riveting part 14 is riveted, four lugs 1312 are formed at the four corners of the cylindrical part 131. Among them, the fourth convex part 134 is flush with the fourth surface 1311. In this way, the four lugs 1312 formed at the diagonal positions can reliably press and fit the corner positions of the insulating part 12 and the riveting part 14. Moreover, the second convex part 132 is connected to the multiple lugs 1312 in the circumferential direction. The second convex part 132 and the multiple lugs 1312 jointly limit the riveting part 14 and the insulating part 12, better improving the sealing performance of the end cover assembly 10 and preventing electrolyte leakage. In addition, after the four lugs 1312 are pressed and fitted, the riveting part 14 and the insulating part 12 are relatively flat and no longer warped, ensuring the effective fitting of the top patch installed on the top cover 11 and the top cover 11.

[0099] Exemplarily, the distance between the outer edge of the lug 1312 and the side wall of the cylindrical part 131 is greater than the distance between the outer edge of the second convex part 132 and the side wall of the cylindrical part 131.

[0100] Among them, the outer edge of the lug 1312 is the edge of the lug 1312 far from the outer peripheral surface of the cylindrical part 131. Similarly, the outer edge of the second convex part 132 is the edge of the second convex part 132 far from the outer peripheral surface of the cylindrical part 131. The distance between the outer edge of the lug 1312 and the corresponding outer peripheral surface on the cylindrical part 131 (i.e., the outer peripheral surface at the corner of the cylindrical part 131) is greater than the distance between the outer edge of the second convex part 132 and the corresponding outer peripheral surface of the cylindrical part 131 (i.e., the outer peripheral surface at the flat side of the cylindrical part 131).

[0101] When the riveting part 14 is riveted, since the partial side walls at the diagonal corners of the cylindrical part 131 are thicker and the range of outward extension and deformation is larger than that of the side walls where the four sides of the cylindrical part 131 are located, the distance between the outer edge of the lug 1312 and the side wall of the cylindrical part 131 is greater than the distance between the outer edge of the second convex part 132 and the side wall of the cylindrical part 131. In this way, the lug 1312 can better press and connect the connection part at the corner of the riveting part 14 and the insulating part 12, ensuring that the riveting part 14 and the insulating part 12 can be reliably fitted together and improving the sealing performance of the end cover assembly 10.

[0102] Please refer to Figure 3 and Figure 6For example, the insulating member 12 includes a main body 124, a first convex ring 125 and a second convex ring 126, the main body 124 is arranged on the top cover 11, the first convex ring 125 is arranged on the side of the main body 124 facing the top cover 11 and is located in the first through hole 111, the second convex ring 126 is arranged on the side of the first convex ring 125 away from the main body 124 and is located in the first through hole 111, the distance between the inner wall surface of the first convex ring 125 and the peripheral wall of the first through hole 111 is greater than the distance between the inner wall surface of the second convex ring 126 and the peripheral wall of the first through hole 111, and the first convex ring 125, the second convex ring 126 and the main body 124 enclose the second through hole 121. The end cover assembly 10 also includes a seal 15, which is sleeved on the column portion 131 and located in the first through hole 111. The surface of the second convex ring 126 facing away from the first convex ring 125 abuts against the surface of the seal 15 facing the top cover 11, so as to make the inner wall surface of the seal 15 abut against the outer peripheral surface of the column portion 131.

[0103] The second protruding ring 126 is disposed at the edge of the first protruding ring 125 near the peripheral wall of the first through hole 111, and a gap is formed between the second protruding ring 126 and the column portion 131. The outer peripheral walls of the first protruding ring 125 and the second protruding ring are both in contact with the peripheral wall of the first through hole 111.

[0104] When assembling the pole 13, the seal 15 can be sleeved on the column part 131, and then the pole 13 and the seal 15 are assembled to the top cover 11, wherein the column part 131 is penetrated by the first through hole 111, and part of the structure of the seal 15 is embedded in the first through hole 111, and part of it is embedded in the gap between the outer peripheral surface of the column part 131 and the second convex ring 126, and the surface of the second convex ring 126 facing away from the first convex ring 125 is pressed against the surface of the seal 15 facing the top cover 11, and the second convex ring 126 can press the seal 15 along the thickness direction of the column part 131, and give the seal 15 an extrusion force along the thickness direction of the column part 131, so that the seal 15 is deformed along the radial direction of the column part 131 and pressed against the outer peripheral surface of the column part 131, so that the seal 15 is tightly fitted to the outer peripheral surface of the column part 131, so as to seal between the column part 131 and the peripheral wall of the first through hole 111.

[0105] Among them, part of the structure of the seal 15 is located between the top cover 11 and the flange portion 133, so that the flange portion 133 and the second convex ring 126 apply extrusion pressure to the two surfaces of the seal 15 in the thickness direction, so that the seal 15 fits tightly between the top cover 11 and the flange portion 133. At the same time, the inner circumferential surface of the seal 15 fits on the outer circumferential surface of the column portion 131, thereby improving the sealing performance of the seal 15 between the top cover 11, the column portion 131 and the flange portion 133.

[0106] In this application, through the mating connection between the first convex portion 122 and the first groove 141, and the limiting of the second convex portion 132 and the lug 1312, the riveting part 14 and the insulating part 12 are stably and flatly installed on the side of the top cover 11 away from the flange portion 133, preventing the edges of the riveting part 14 and the insulating part 12 from warping, which may cause the sealing performance of the end cover assembly 10 to decrease after the seal 15 ages and hardens during long-term use, and preventing electrolyte leakage.

[0107] Exemplarily, the body 124 includes a first branch 1241 and a second branch 1242. The first convex portion 122 is provided on the second branch 1242. The second branch 1242 is provided on the surface of the first branch 1241 away from the top cover 11. The inner side wall of the second branch 1242 is flush with the peripheral wall of the second through hole 121. The outer peripheral edge of the second branch 1242 has a second arc surface 1243. Both the first branch 1241 and the second branch 1242 surround the second through hole 121; in the width direction of the insulating part 12, the width of the second branch 1242 is smaller than that of the first branch 1241, and the width of the second branch 1242 is larger than the width of the riveting part 14.

[0108] The second branch 1242 is stacked on the side of the first branch 1241 close to the second through hole 121, and the width of the first branch 1241 is larger than that of the second branch 1242. That is, the thickness of the inner ring part of the insulating part 12 is thicker, and the thickness of the outer ring is thinner. The outer peripheral edge of the second branch 1242 has a second arc surface 1243, so that the outer peripheral edge of the second branch 1242 is in arc transition with the first branch 1241, and the first branch 1241 and the second branch 1242 protruding from the top cover 11 form a stepped tower shape that gradually increases from top to bottom. When the subsequent top patch is attached, it can be easily sleeved from the upper surfaces of the two end poles 13 at both ends and adjusted and positioned layer by layer, avoiding too large a height difference between the steps of the first branch 1241 and the second branch 1242 protruding from the top cover 11, which may cause interference and jamming when the top patch is sleeved; at the same time, avoiding the outer peripheral edge of the body 124 from warping due to the riveting pressure, which may affect the subsequent process of attaching the top patch to the top cover 11. After the riveting part 14 is sleeved on the column part 131, the riveting part 14 abuts against the surface of the second branch 1242 away from the top cover 11, and the width of the second branch 1242 is larger than the width of the riveting part 14, so that the riveting part 14 presses against the body 124 over a larger area.

[0109] The above are some embodiments of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of this application.

Claims

1. An end cap assembly, characterized in that, Comprising: A top cover, formed with a first through hole; An insulating member, installed on the top cover. The orthographic projection of the insulating member on a plane perpendicular to the thickness direction of the insulating member is a rounded rectangle. The insulating member includes a second through hole and a plurality of first convex portions. The second through hole is opposite to the first through hole. The plurality of first convex portions are provided at the corners of the first surface of the insulating member. The first surface is the surface of the insulating member facing away from the top cover. The plurality of first convex portions are arranged around the second through hole. The first convex portions are provided at the edges of the peripheral wall of the first surface close to the second through hole; A pole column, including a column body portion and a second convex portion. The orthographic projection of the column body portion on a plane perpendicular to the thickness direction of the column body portion is a rounded rectangle. The column body portion passes through the first through hole and the second through hole and protrudes from the first surface. The second convex portion protrudes from the outer peripheral surface of the column body portion and is located on the side where the column body portion protrudes from the first surface. The pole column further includes a flange portion. The column body portion is installed on the flange portion. The flange portion is located on the side of the top cover facing away from the insulating member. The column body portion is formed with a plurality of lugs. The plurality of lugs are provided at the corners of the end of the column body portion far from the flange portion. In the circumferential direction of the column body portion, the second convex portion is connected to the plurality of lugs. The distance between the outer edge of the lug and the side wall of the column body portion is greater than the distance between the outer edge of the second convex portion and the side wall of the column body portion; A press riveting part. The orthographic projection of the press riveting part on a plane perpendicular to the thickness direction of the press riveting part is a rounded rectangle. The press riveting part includes a plurality of first grooves corresponding to the plurality of first convex portions one by one. The plurality of first grooves are provided at the corners of the second surface of the press riveting part. The second surface is the surface of the press riveting part facing the insulating member. The press riveting part further includes a third through hole. The third through hole is opposite to the second through hole. The first grooves are provided at the edges of the peripheral wall of the second surface close to the third through hole. The first convex portions are received in the first grooves. The thickness of the first convex portion in the thickness direction of the insulating member is greater than the depth of the first groove in the thickness direction of the press riveting part. The press riveting part is sleeved on the column body portion. The column body portion and the insulating member are riveted and fixed to the top cover through the press riveting part. In the thickness direction of the press riveting part, the press riveting part is located between the insulating member and the second convex portion. The press riveting part further includes a third surface opposite to the second surface. The first groove is recessed from the second surface towards the third surface and forms a third convex portion opposite to the first groove on the third surface. The third convex portion is embedded in the lug; When assembling the end cover assembly, the first through hole provided in the column part is protruded from the top cover, and the rivet is installed on the first surface of the insulating part, wherein before riveting, a plurality of fourth convex parts are formed on the fourth surface of the column part, the fourth surface is the surface of the column part away from the flange part, a plurality of the fourth convex parts protrude from the fourth surface and are respectively located at the corners of the fourth surface, and there is a gap between the rivet and the arc-shaped corner of the column part; during riveting, the insulating part and the corner of the rivet are placed at the corner of the column part, and stamping is performed on the upper edge of the column part, the column part is deformed by pressure and first fills the gap between the rivet and the column part at the corner, and then deforms outward along the circumference of the column part, and after the rivet is riveted, the fourth convex part forms the lug, so that the lug is pressed into the corner of the insulating part and the rivet; The first protrusion is adapted to the first groove, and the first protrusion includes a first end and a second end opposite to each other, the first end abuts against the first surface, and the first protrusion extends from the second end toward the first end in the radiation direction of the second end, and the first protrusion includes a first plane, a second plane and a first arc surface connected in sequence, and the extension directions of the first plane, the second plane and the first arc surface are different from each other, the first plane, the second plane and the first arc surface enclose the circumference of the first protrusion, the bottom edge of the first arc surface is flush with the side wall of the second through hole, the bottom edge of the first arc surface is located on the first surface, and the first plane, the second plane and the end of the first arc surface facing away from the first surface form the second end; the rivet includes a third through hole, and the first groove is connected to the third through hole.

2. The end cap assembly according to claim 1, characterized in that, The plurality of first protrusions are diagonally distributed on the first surface, and the plurality of first grooves are diagonally distributed on the second surface.

3. The end cap assembly according to claim 1, wherein, The cross-sectional area of ​​the first protrusion cut along a plane perpendicular to the thickness direction of the insulating member gradually decreases in the direction from the first end to the second end, and the minimum cross-sectional area of ​​the first protrusion cut along a plane perpendicular to the thickness direction of the insulating member is equal to 0.

4. The end cap assembly according to claim 1, characterized in that, A vertical distance H between the highest point of the fourth protrusion in the thickness direction of the column portion and the fourth surface satisfies: 0.05 mm ≤ H ≤ 2.45 mm.

5. The end cap assembly according to claim 1, wherein The insulating member includes a body, a first convex ring and a second convex ring, the body is arranged on the top cover, the first convex ring is arranged on a side of the body facing the top cover and is located in the first through hole, the second convex ring is arranged on a side of the first convex ring away from the body and is located in the first through hole, the distance between the inner wall surface of the first convex ring and the peripheral wall of the first through hole is greater than the distance between the inner wall surface of the second convex ring and the peripheral wall of the first through hole, the first convex ring, the second convex ring and the body are combined to form the second through hole, and the end cover assembly also includes a sealing member, which is sleeved on the column part and is located in the first through hole, the surface of the second convex ring on the side away from the first convex ring abuts against the surface of the sealing member on the side facing the top cover, so as to make the inner wall surface of the sealing member abut against the outer peripheral surface of the column part.

6. The end cap assembly according to claim 5, characterized in that, The main body includes a first section and a second section, the first convex portion is arranged on the second section, the second section is arranged on the surface of the first section away from the top cover, the inner side wall of the second section is flush with the peripheral wall of the second through hole, the outer peripheral edge of the second section has a second arc surface, and the first section and the second section both surround the second through hole; in the width direction of the insulating part, the width of the second section is smaller than the width of the first section, and the width of the second section is larger than the width of the rivet.

7. A energy storage device, characterized in that, include: A housing forms a receiving space, wherein the receiving space has an opening; An electrode assembly is contained in the containing space; The end cap assembly according to any one of claims 1 to 6, wherein the end cap assembly covers the opening, and the end cap assembly further comprises a transition piece, and the electrode assembly is electrically connected to the pole via the transition piece.

8. An electrical device, characterized in that, It includes the energy storage device as described in claim 7, and the energy storage device supplies power to the electrical equipment.

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