End cover assembly, energy storage device and electric equipment

Abstract

The utility model discloses an end cover assembly, an energy storage device and electric equipment. The end cover assembly comprises an end cover, a top patch, first and second upper plastic cement, first and second pole columns, and first and second gaskets. The end cover comprises a first surface and a second surface, the first upper plastic comprises a first upper plastic body and a first flange, and the second upper plastic comprises a second upper plastic body and a second flange; the first gasket is sleeved on the first upper plastic body, the first upper plastic body is sleeved on the first pole, the first gasket is clamped between the first flange and the first surface, and a part of the first gasket protrudes out of the first flange; the second gasket is sleeved on the second upper plastic body, the second upper plastic body is sleeved on the second pole, the second gasket is clamped between a part of the second flange and the first surface, and a part of the second flange abuts against the first surface; part of the second gasket protrudes out of the second flange; the top patch is attached to the first surface and sleeved on the periphery of the first flange and the periphery of the second flange, and gaps are reserved between the top patch and the first upper plastic and between the top patch and the second upper plastic.

Description

Technical Field

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

[0002] As the demand for secondary energy storage devices grows, people have higher and higher requirements on their energy density, reliability, sealing performance and cost, especially the top cover. In the existing end cover assembly, due to poor sealing performance, the electrolyte flows into the end cover assembly through the upper plastic and the end cover when the energy storage device is filled, which in turn corrodes the end cover assembly and even causes the end cover assembly to be scrapped, reducing the reliability of the energy storage device. Utility Model Content

[0003] The present application provides an end cover assembly, an energy storage device and an electrical device, which improve the sealing of the end cover assembly, prevent the electrolyte from corroding the upper plastic, and increase the reliability of the energy storage device.

[0004] The present application provides an end cap assembly, the end cap assembly comprising an end cap, a top patch, a first upper plastic, a second upper plastic, a first pole, a second pole, a first gasket and a second gasket;

[0005] The first pole includes a first flange, and the second pole includes a second flange;

[0006] The end cover comprises a first surface and a second surface, the first surface and the second surface are arranged in opposite directions along the thickness direction of the end cover assembly, the end cover further comprises a first mounting hole and a second mounting hole arranged at intervals, the first mounting hole and the second mounting hole both penetrate the first surface and the second surface,

[0007] The first upper plastic includes a first upper plastic body and a first flange, wherein the first flange is connected to one end of the first upper plastic body and is coaxial with the first upper plastic body; the second upper plastic includes a second upper plastic body and a second flange, wherein the second flange is connected to one end of the second upper plastic body and is coaxial with the second upper plastic body;

[0008] The first gasket is sleeved on the first upper plastic body, the first upper plastic is sleeved on the first pole, and the first upper plastic body and the first pole are jointly accommodated in the first mounting hole, the first flange and the first flange protrude from the first surface, the first flange surrounds the first flange, and the first gasket is clamped between the first flange and the first surface along the thickness direction of the end cover assembly, and a portion of the first gasket protrudes from the first flange in the radial direction of the first mounting hole;

[0009] The second gasket is sleeved on the second upper plastic body, the second upper plastic is sleeved on the second pole, the second upper plastic body and the second pole are jointly accommodated in the second mounting hole, the second flange and the second flange protrude from the second surface, the second flange surrounds the outer circumference of the second flange, along the thickness direction of the end cover assembly, the second gasket is clamped between part of the second flange and the first surface, and part of the second flange abuts against the first surface; part of the second gasket protrudes from the second flange along the radial direction of the second mounting hole;

[0010] The top patch includes a first perforation hole and a second perforation hole, wherein the first perforation hole and the second perforation hole penetrate two surfaces of the top patch in the thickness direction, and the top patch is attached to the first surface, the first perforation hole is sleeved on the outer periphery of the first flange, and the second perforation hole is sleeved on the outer periphery of the second flange, wherein the aperture of the first perforation hole is larger than the outer diameter of the first flange, and the aperture of the second perforation hole is larger than the outer diameter of the second flange.

[0011] The end cap assembly in the present application is provided with an insulating first gasket between the first upper plastic and the end cap to achieve sealing, and a second gasket is also provided between the second upper plastic and the end cap to achieve sealing, the first gasket protrudes the first flange along the radial direction of the first mounting hole, and the second gasket protrudes the second flange along the radial direction of the second mounting hole, which can block the electrolyte on the first surface of the end cap from flowing to the first mounting hole and the second mounting hole, and prevent the electrolyte from flowing into the end cap, and the first gasket and the second gasket have a simple structure and are relatively easy to assemble. The aperture of the first perforation is larger than the outer diameter of the first flange, and the aperture of the second perforation is larger than the outer diameter of the second flange. It can be understood that there is a gap between the top patch and the first upper plastic and the second upper plastic, which improves the creepage distance of the second pole.

[0012] The first gasket and the second gasket are elastic and insulating, the thickness of the first gasket is greater than or equal to 0.03 mm and less than or equal to 0.2 mm, and the thickness of the second gasket is greater than or equal to 0.03 mm and less than or equal to 0.2 mm. The thickness of the first gasket and the second gasket is relatively thin, and when the top patch is attached to the first surface of the end cover, no bulge will be formed to cause the top patch to be uneven, and the appearance of the end cover assembly will not be affected.

[0013] The first gasket is interference fit with the first upper plastic, the second gasket is interference fit with the second upper plastic, and the elastic gasket is used to achieve interference fit between the upper plastic and the end cover, thereby improving the sealing performance between the upper plastic and the end cover.

[0014] Wherein, the first gasket includes a first hole, the aperture of the first hole is equal to the aperture of the first mounting hole, and the second gasket includes a second hole, the aperture of the second hole is larger than the aperture of the second mounting hole;

[0015] The second flange is provided with a recessed portion, the recessed portion surrounds the second upper plastic body, and the second upper plastic body passes through the second hole and the second mounting hole; the second gasket is stacked on the first surface and surrounds the second mounting hole, and the portion of the second gasket close to the second mounting hole is clamped between the recessed portion and the first surface. The depth of the recessed portion in the thickness direction of the second pole is equal to the thickness of the second gasket; by accommodating the second gasket in the recessed portion, the distance between the second upper plastic and the end cover will not be increased, and it can be ensured that the second flange of the second upper plastic and the end cover can be in contact to achieve weak electrical conductivity between the two.

[0016] Wherein, the top patch is provided with a first through hole and a second through hole, and the first through hole and the second through hole penetrate the top patch along the thickness direction of the top patch;

[0017] The diameter of the first perforation is larger than the outer diameter of the first flange of the first upper plastic and smaller than the outer diameter of the first gasket, and the diameter of the second perforation is larger than the outer diameter of the second flange of the second upper plastic and smaller than the outer diameter of the second gasket. It is ensured that the top patch can cover the gap between the outer periphery of the gasket and the end cover and cover the gasket. It is also possible to ensure the gap between the flange and the top patch.

[0018] The first flange includes a first inner side surface and a first inclined surface, the first inclined surface connects the first inner side surface and the outer peripheral surface of the first flange, and the first inclined surface is inclined away from the first inner side surface. The first inclined surface can form a drainage inclined surface, and if the electrolyte falls on the first pole or the first inclined surface, the electrolyte will flow down along the first inclined surface, thereby preventing the external electrolyte from entering the end cap assembly through the gap between the first upper plastic and the first flange of the first pole.

[0019] The first flange further includes a first abutment platform, the first abutment platform faces the same direction as the extension direction of the first pole body, a portion of the outer peripheral side of the first flange is opposite to the first inner side surface, and along the axial direction of the first pole, the first abutment platform abuts against the connection between the first inner side surface and the first inclined surface, and the first abutment platform blocks the gap between the first flange and the first flange. The first abutment platform completely covers the gap between the first flange and the first upper plastic, and can prevent external electrolyte from entering the end cap assembly through the gap between the first upper plastic and the first flange of the first pole.

[0020] The connection between the first inner side surface and the first inclined surface is a plane, which can improve the matching flatness between the upper plastic and the flange.

[0021] The first flange is also provided with a first step, the first step is facing away from the first pole body and surrounds the axis of the first pole body, the first step is in the opposite direction to the first abutment platform, and the first step completely covers the first abutment platform in the axial direction of the first pole. The first abutment platform completely covers the first plane, and the first step and the first abutment platform cover the gap between the first flange and the first upper plastic; it can prevent the external electrolyte from entering the end cover assembly through the gap between the first upper plastic and the first flange of the first pole. The first inclined surface can form a drainage inclined surface. If the electrolyte falls on the first pole or the first inclined surface, the electrolyte will flow down along the first inclined surface, preventing the external electrolyte from entering the end cover assembly through the gap between the first upper plastic and the first flange of the first pole.

[0022] The first flange includes a first step surface, a first inner side surface and a first inclined surface, the first step surface is connected to the first inner side surface, the first inclined surface connects the first inner side surface and the outer peripheral surface of the first flange, the first step surface faces away from the first upper plastic body, and the first inner side surface and the outer peripheral surface of the first flange are arranged in opposite directions;

[0023] The first flange is also provided with a first ventilation groove, which is recessed in the first step surface, and two ports in the length direction of the first ventilation groove respectively penetrate the inner ring surface of the first upper plastic and the connection between the first step surface and the first inner side surface. The first ventilation groove can make the gas between the first pole and the first upper plastic communicate with the outside air of the end cover assembly, so as to avoid the first pole and the first upper plastic being too close and not ventilated, resulting in the mistaken assumption that the sealing performance around the first pole is qualified during the sealing test, and the mistaken assumption that the sealing ring is sealed in place.

[0024] The outer diameter of the first flange is greater than the outer diameter of the first flange. Before welding the tab when assembling the battery cell and the end cover assembly, the automatic identification mechanism can quickly and accurately identify the first pole according to the position of the protruding first flange, thereby improving the assembly speed.

[0025] The second flange includes a second step surface, a second inner side surface and a second inclined surface, the second step surface is connected to the second inner side surface, the second inclined surface connects the second inner side surface and the outer peripheral surface of the second flange, the second step surface faces away from the second upper plastic body, and the second inner side surface and the outer peripheral surface of the second flange are arranged in opposite directions;

[0026] The second flange is also provided with a second ventilation groove, which is recessed in the second step surface, and two ends of the second ventilation groove in the length direction respectively penetrate the inner ring surface of the second upper plastic and the connection between the second step surface and the second inner side surface; wherein the outer diameter of the second flange is greater than the outer diameter of the second flange.

[0027] The width of the first gasket in the radial direction is greater than 1.5 mm, and the width of the second gasket in the radial direction is greater than 1.5 mm.

[0028] The present application provides an energy storage device, which includes the end cap assembly, a shell and a battery cell. The battery cell is installed in the shell, and the end cap assembly is installed at one end of the shell and encapsulates the battery cell.

[0029] The present application provides an electrical device, and an energy storage device thereof, wherein the energy storage device is used to supply power to the electrical device.

[0030] The end cover assembly in the present application is provided with an insulating first gasket between the first upper plastic and the end cover to achieve sealing, and a second gasket is also provided between the second upper plastic and the end cover to achieve sealing, the first gasket protrudes the first flange along the radial direction of the first mounting hole, and the second gasket protrudes the second flange along the radial direction of the second mounting hole. The first gasket and the second gasket can block the electrolyte on the first surface of the end cover from flowing to the first mounting hole and the second mounting hole, thereby preventing the electrolyte from flowing into the interior of the end cover, and the first gasket and the second gasket have a simple structure and are relatively easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying any creative work.

[0032] Figure 1 is an application scenario diagram of the energy storage device provided in the embodiment of the present application;

[0033] Figure 2 yes Figure 1 A schematic structural diagram of a first embodiment of an energy storage device shown;

[0034] Figure 3 yes Figure 2 A schematic structural diagram of an end cap assembly of an energy storage device shown;

[0035] Figure 4 yes Figure 3 An exploded structural diagram of the end cap assembly shown;

[0036] Figure 5 yes Figure 3 A schematic cross-sectional structure diagram of a first pole of an end cap assembly shown;

[0037] Figure 6 yes Figure 3 A schematic cross-sectional view of the upper plastic of the end cap assembly shown;

[0038] Figure 7 yes Figure 3 The schematic diagram of the exploded cross section of the upper plastic part of the end cap assembly shown;

[0039] Figure 8 yes Figure 3 A schematic diagram of a portion of the internal structure of the end cap assembly shown, wherein no hatching is provided;

[0040] Fig. 9 yes Figure 1 A schematic structural diagram of an end cap assembly of a second embodiment of an energy storage device shown;

[0041] Fig.10 yes Fig. 9 The schematic diagram of the pole and upper plastic structure of the end cover assembly shown;

[0042] Fig.11 yes Fig. 9 A schematic diagram of the internal structure of two poles of the end cap assembly shown, wherein no hatching is provided;

[0043] Fig.12 yes Fig. 9 A schematic cross-sectional view of the plastic on the end cap assembly shown;

[0044] Fig.13 yes Fig. 9 A schematic diagram of the internal structure of the end cap assembly is shown; no section lines are set.

[0045] The nouns corresponding to the reference numerals in the figure are: energy storage system 5000, electric energy conversion device 4500, wind energy conversion device 4000, second electric equipment 3000, energy storage device 1000, end cover assembly 100, shell 400, end cover 10, first pole 21, second pole 22, first upper plastic 30, second upper plastic 40, lower plastic 50, first pressing block 61, second pressing block 62, first pole body 211, first flange 212, first metal part 215, second metal The connecting portion 216, the first step 213, the first abutting platform 214, the connecting interface 217, the second pole body 221, the second flange 222, the second step 223, the second abutting platform 224, the first sealing ring 63, the second sealing ring 64, the first through hole 613, the second through hole 623, the first surface 11, the second surface 12, the first mounting groove 13, the second mounting groove 14, the first mounting hole 15, the second mounting hole 16, the lower plastic body 51, the third surface 511, the fourth surface 512, first avoidance groove 52, second avoidance groove 53, first boss 54, second boss 55, first assembly hole 58, second assembly hole 59, first upper plastic body 31, first flange 32, first inner ring surface 311, first step surface 320, first abutting surface 321, first part 32a, second part 32b, first pole through hole 33, second flange 42, second upper plastic body 41, second inner ring surface 411, second step surface 420, second abutting surface 421 , third part 42a, fourth part 42b, second pole through hole 43, first inner side surface 323, first inclined surface 324, first plane 3211, first ventilation groove 36, second inner side surface 423, second inclined surface 424, second plane 4211, second ventilation groove 46, recess 425, top patch 70, first surface 71, second surface 72, first through hole 73, second through hole 74, first gasket 81, second gasket 82, first hole 811, second hole 821, gap B. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In the present application, unless otherwise expressly specified and limited, terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, the connection may be fixed or detachable, or integrated; the connection may be mechanical or electrical, or the two may communicate with each other; the connection may be direct or indirect through an intermediate medium; the connection may be internal to two elements or there may be an interaction relationship between two elements, unless otherwise clearly and specifically limited.

[0048] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] Taking electrochemical energy storage as an example, this solution provides an energy storage device, which has a group of chemical batteries in it. The chemical elements in the chemical batteries are mainly used as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage media. Simply put, the electricity generated by wind and solar energy is stored in chemical batteries. When the use of external electricity reaches its peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0050] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including (wind and solar) power generation side energy storage, grid side energy storage, base station side energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0051] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0052] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side mainly operate in the "peak shaving and valley filling" mode. Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills.

[0053] It should be noted that the above-mentioned energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes and other equipment containing energy storage devices can be understood as electrical equipment.

[0054] See also Figure 1 , Figure 1 It is an application scenario diagram of the energy storage device provided in the embodiment of the present application.

[0055] The energy storage device 1000 provided in the embodiment of the present application is applied to an energy storage system 5000, which includes an electric energy conversion device 4500 (photovoltaic panel), a wind energy conversion device 4000 (windmill), a first electric device (grid), a second electric device 3000 (base station) and an energy storage device 1000. The energy storage system also includes an energy storage cabinet, and the energy storage device 1000 is installed in the energy storage cabinet, which can be installed outdoors. Specifically, the first electric energy conversion device can convert solar energy into electric energy during the period of low electricity prices, and the energy storage device 1000 is used to store the electric energy and supply the first electric device or the second electric device during peak power consumption, or to supply power when the first electric device or the second electric device is powered off / out of power. The second electric energy conversion device can convert wind energy into electric energy, and the energy storage device 1000 is used to store the electric energy and supply the first electric device or the second electric device during peak power consumption, or to supply power when the first electric device or the second electric device is powered off / out of power. Among them, the transmission of electric energy can be carried out using high-voltage cables.

[0056] It should be noted that the first power-consuming device, the second power-consuming device and other devices including the energy storage device 1000 can be understood as power-consuming devices.

[0057] See also Figure 2 , Figure 2 yes Figure 1 The schematic structural diagram of the first embodiment of the energy storage device is shown.

[0058] The energy storage device 1000 may include but is not limited to a single cell, a battery module, a battery pack, a battery system, etc. It is understandable that the actual application form of the energy storage device 1000 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. For example, the energy storage device 1000 may be a secondary battery such as a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead storage) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. When the energy storage device 1000 is a single cell, it may be a cylindrical battery, a square battery, or a battery of other shapes. In this embodiment, the energy storage device 1000 is a square battery. Among them, the square battery is a secondary battery. It should be noted that the number of energy storage devices 1000 may be several, and several energy storage devices 1000 are connected in series or in parallel. In this embodiment, "several" refers to two or more.

[0059] The energy storage device 1000 includes an end cap assembly 100, a shell 400, and a battery cell (not shown). The shell 400 includes an opening (not shown) and a receiving cavity (not shown). The battery cell includes a positive electrode ear (not shown) and a negative electrode ear (not shown). The end cap assembly 100 includes a first pole 21 and a second pole 22. When assembling the energy storage device 1000, the positive electrode ear is first welded to the first pole 21, and the negative electrode ear is welded to the second pole 22, and then the battery cell is placed in the receiving cavity of the shell 400, and the end cap assembly 100 is sealed to the opening of the shell 400 to assemble into a semi-finished battery, and then a series of processes such as liquid injection are performed to obtain the energy storage device 1000. The present application does not limit the specific structure of the energy storage device 1000.

[0060] For ease of description, in this application, the thickness direction of the energy storage device 1000 is defined as the Z-axis direction, the width direction is defined as the X-axis direction, and the length direction is defined as the Y-axis direction. The X-axis, Y-axis, and Z-axis directions are perpendicular to each other. The directional terms such as "upper", "top", "lower", "bottom", "left", and "right" mentioned in the description of the embodiments of this application are based on the attached specification. Figure 2 The description of the orientation shown does not constitute a limitation on the actual application scenario of the energy storage device 1000. A certain tolerance is allowed for the terms "same", "equal" or "parallel" used in the following text.

[0061] It should be noted that the end cap assembly 100 includes two poles (not shown) and upper plastics corresponding to the two poles, pole through holes, protrusions, sealing rings and other related structures provided on the end cap. The two poles are used to connect to the positive pole tab and the negative pole tab, respectively. In the following specific embodiments, for the convenience of description, two components of the same structure are named first and second to distinguish them. The different materials of the two poles lead to different structures. For the sake of ease of understanding, they are also named first and second to distinguish them.

[0062] Please refer to Figure 3 and Figure 4 The end cover assembly 100 includes an end cover 10, a first pole 21 and a second pole 22, a first upper plastic 30 and a second upper plastic 40, a lower plastic 50, a first pressing block 61, a second pressing block 62, a top patch 70, a first gasket 81 and a second gasket 82.

[0063] The first pole 21 may be a positive pole and the second pole 22 may be a negative pole, or the first pole 21 may be a negative pole and the second pole 22 may be a positive pole. Exemplarily, the first pole 21 is a negative pole and the second pole 22 is a positive pole.

[0064] The first pole 21 and the second pole 22 are respectively located at opposite ends of the length direction of the end cap assembly 100. The end cap 10 and the lower plastic 50 are stacked along the thickness direction of the end cap assembly 100. The first upper plastic 30 is sleeved on the first pole 21 and insulates the end cap 10 and the first pole 21. The second upper plastic 40 is sleeved on the second pole 22 and insulates the second pole 22 from the end cap 10. Among them, the first pole 21, the first upper plastic 30 and the first pressing block 61 are correspondingly arranged in sequence and connected to the end cap 10 and the lower plastic 50. The first pole 21 is insulated and sealed with the end cap 10 by the cooperation of the first sealing ring 63, the first upper plastic 30 and the lower plastic 50. The second pole 22, the second upper plastic 40 and the second pressing block 62 are correspondingly arranged in sequence and connected to the end cap 10 and the lower plastic 50. The second pole 22 is insulated and sealed with the end cap 10 by the cooperation of the second upper plastic 40, the second sealing ring 64 and the lower plastic 50.

[0065] See also Figure 5 The first pole 21 includes a first pole body 211 and a first flange 212. Along the height direction of the first pole 21, the first pole body 211 is connected to the surface of one side of the first flange 212. In this embodiment, the first flange 212 is a circular block, and the first pole body 211 is protruded on a surface of the first flange 212. The first flange 212 and the first pole body 211 are coaxially arranged.

[0066] In this embodiment, the first pole 21 is a negative pole. The first pole 21 also includes a first metal part 215 and a second metal part 216. Along the height direction of the first pole 21, the first metal part 215 covers the side of the second metal part 216 facing away from the first flange 212 of the first pole 21. It can be understood that the outer surface of the column of the first pole body 211 and the outer surface of the first flange 212 facing the first pole body 211 together constitute the first metal part 215. Among them, a connection interface 217 is formed between the first metal part 215 and the second metal part 216. In this embodiment, the connection interface 217 is a curved surface, which is roughly a "bowl"-shaped interface. It can be understood that the surfaces opposite to the first metal part 215 and the second metal part 216 are curved surfaces. The first pole 21 can be formed by an integrated stamping method or a machining method. In this embodiment, the first pole 21 can be a copper-aluminum composite structure made by a stamping process, which has a simple processing technology and high preparation efficiency, and can effectively reduce the production cost of the first pole 21. For example, the first metal part 215 of the first pole 21 is made of copper, and the second metal part 216 is made of aluminum. The first flange 212 and the second metal part 216 are formed in one piece.

[0067] In this embodiment, the structure of the second pole 22 is similar to that of the first pole 21, except that the material of the second pole 22 is different from that of the first pole 21. In this embodiment, the second pole 22 is a positive pole. The second pole 22 includes a second pole body 221 and a second flange 222. In this embodiment, the second flange 222 is a circular block, and the second pole body 221 is convexly arranged on a surface of the second flange 222. The second flange 222 and the second pole body 221 are coaxially arranged.

[0068] like Figure 4 The first pressing block 61 includes a first through hole 613. Along the thickness direction of the first pressing block 61, the first through hole 613 penetrates two surfaces of the first pressing block 61 in the thickness direction facing each other. The first through hole 613 is used for the first pole 21 to pass through. The structure of the second pressing block 62 is the same as that of the first pressing block 61. The second pressing block 62 includes a second through hole 623. Along the thickness direction of the second pressing block 62, the second through hole 623 penetrates two surfaces of the second pressing block 62 in the thickness direction facing each other. The second through hole 623 is used for the second pole 22 to pass through. In other embodiments, the structure of the second pressing block 62 may be different from that of the first pressing block 61.

[0069] like Figure 4 The top patch 70 is a rectangular thin plate, which includes a first surface 71 and a second surface 72, the first surface 71 and the second surface 72 are arranged in opposite directions, and the top patch 70 also includes a first through hole 73 and a second through hole 74. The first through hole 73 and the second through hole 74 both penetrate the first surface 71 and the second surface 72, and the first through hole 73 and the second through hole 74 are arranged opposite to each other along the length direction of the top patch 70. The top patch 70 is made of insulating material.

[0070] See also Figure 6 and Figure 7 The first upper plastic 30 and the second upper plastic 40 are annular plastic parts, and the annular shape is to match the cylindrical first pole 21. If the first pole and the second pole are rectangular columns, the shapes of the first upper plastic 30 and the second upper plastic 40 can also change accordingly.

[0071] The first upper plastic 30 includes a first upper plastic body 31 and a first flange 32. Along the height direction of the first upper plastic, the first upper plastic body 31 and the first flange 32 are connected and together form a first pole through hole 33. In this embodiment, the first upper plastic body 31 is cylindrical and includes a first inner ring surface 311. The first flange 32 is connected to one end of the first upper plastic body 31 and is coaxially arranged. The first flange 32 includes a first step surface 320 and a first abutting surface 321, the first inner ring surface 311 is connected to the first step surface 320, and there is an angle between the first inner ring surface 311 and the first step surface 320. In this embodiment, the angle between the first inner ring surface 311 and the first step surface 320 is 90 degrees. The first inner ring surface 311 is the surface of the first upper plastic body 31 facing the central axis, and the first step surface 320 extends along the radial direction of the first pole through hole 33. The first step surface 320 and the first abutting surface 321 are arranged in back-to-back relationship, and the first abutting surface 321 is connected to the outer peripheral surface of the first upper plastic body 31 .

[0072] In this embodiment, the first flange 32 is a circular ring with a substantially L-shaped cross section, and the first flange 32 includes a first portion 32a and a second portion 32b, which are connected and have an angle, and the angle between the first portion 32a and the second portion 32b in this embodiment is 90 degrees. The first portion 32a is connected to one end of the first upper plastic body 31 and extends away from the axis. The inner diameter of the first portion 32a and the inner diameter of the second portion 32b are greater than the inner diameter of the first upper plastic body 31. In other embodiments, if the pole is a rectangular column, the first pole through hole of the first upper plastic 30 can be rectangular.

[0073] The first step surface 320 and the first abutting surface 321 are two surfaces in the thickness direction of the first portion 32a. There is an angle between the second portion 32b and the first step surface 320, and the angle in this embodiment is 90 degrees. In other embodiments, the connection between the first inner ring surface 311 and the first step surface 320, and the connection between the second portion 32b and the first step surface 320 can be provided with an arc chamfer, but the overall angle can be understood to be 90 degrees.

[0074] The first pole through hole 33 is used for the first pole 21 to pass through. The first upper plastic body 31 and the first flange 32 together form the first pole through hole 33. It can be understood that the first inner ring surface 311 and the surface of the first flange 32 facing the hole center together form the hole wall of the first pole through hole 33. In this embodiment, the first upper plastic 30 is an independent injection molding component, and multiple first upper plastics 30 can be formed simultaneously with one mold and multiple cavities, which can reduce costs.

[0075] In this embodiment, the structure of the second upper plastic 40 is the same as that of the first upper plastic 30, and the second upper plastic 40 includes a second upper plastic body 41 and a second flange 42. The connection relationship between the second upper plastic body 41 and the second flange 42 can refer to the first upper plastic 30, and will not be repeated here. The second upper plastic body 41 includes a second inner ring surface 411, and the second flange 42 includes a second step surface 420 and a second abutting surface 421. The second flange 42 includes a third portion 42a and a fourth portion 42b. The second step surface 420 and the second abutting surface 421 are arranged in back-to-back relationship, and the second abutting surface 421 is connected to the outer peripheral surface of the second upper plastic body 41.

[0076] In this embodiment, the second upper plastic 40 includes a recessed portion 425, which is recessed in the second abutting surface 421. Specifically, the recessed portion 425 is formed by the connection between the second abutting surface 421 and the outer peripheral surface of the fourth portion 42b being recessed toward the fourth portion 42b and in the radial direction, and the recessed portion 425 surrounds the axis of the second upper plastic 40. Exemplarily, the cross section of the recessed portion 425 is L-shaped. One surface of the recessed portion 425 faces the radial direction of the second upper plastic 40, and the other surface faces the axial direction of the second upper plastic 40.

[0077] The second upper plastic 40 further includes a second pole through hole 43. The second pole through hole 43 is used for the second pole 22 to pass through, and the second upper plastic body 41 and the second flange 42 together form the second pole through hole 43. The plastic material of the second upper plastic 40 of this embodiment is doped with conductive material to achieve electrical conduction performance.

[0078] The first gasket 81 and the second gasket 82 are made of elastic plastic material, such as polypropylene. The first gasket 81 and the second gasket 82 are annular thin sheets. The first gasket 81 includes a first hole 811. The thickness of the first gasket 81 is greater than or equal to 0.03 mm and less than or equal to 0.2 mm. The second gasket 82 includes a second hole 821. The thickness of the second gasket 82 is greater than or equal to 0.03 mm and less than or equal to 0.2 mm.

[0079] In this embodiment, the aperture of the first perforation of the top patch is larger than the outer diameter of the first flange 32, and the aperture of the second perforation of the top patch is larger than the outer diameter of the second flange 42. The outer diameter of the first flange 32 of the first upper plastic 30 is smaller than the outer diameter of the first gasket 81, and larger than the inner diameter of the first hole 811 of the first gasket 81. The outer diameter of the second flange 42 of the second upper plastic 40 is smaller than the outer diameter of the second gasket 82, and larger than the inner diameter of the second hole 821. The width H1 of the first upper plastic body 31 (along the radial direction of the first pole through hole) is smaller than the width H2 of the first gasket 81. In this embodiment, the width H2 of the first gasket 81 is greater than 1.5 mm. The width (not marked in the figure) of the second upper plastic body 41 (along the radial direction of the first pole through hole) is smaller than the width (not marked in the figure) of the second gasket 82. The width H2 of the first gasket 81 in this embodiment is greater than 1.5 mm, so as to facilitate assembly of the automatic production line. The width of the second gasket 82 is greater than 1.5 mm. It should be noted that the width of the annular structure in this embodiment refers to the width of a portion of the two symmetrical cross sections following the radial cross section.

[0080] Please refer to Figure 7 The end cap 10 is a substantially rectangular plate. In this embodiment, the end cap 10 is a plain aluminum sheet. The end cap 10 includes a first surface 11 and a second surface 12, and the first surface 11 and the second surface 12 are disposed opposite to each other along the thickness direction of the end cap 10.

[0081] The end cover 10 includes a first mounting groove 13 and a second mounting groove 14, which are respectively located at opposite ends of the length direction of the end cover 10. The first mounting groove 13 is a substantially rectangular groove body, the opening of the first mounting groove 13 is located on the second surface 12, and the first mounting groove 13 is recessed from the second surface 12 toward the first surface 11. The first mounting groove 13 includes a first groove bottom wall (not marked in the figure).

[0082] In this embodiment, the structure of the second installation groove 14 is the same as that of the first installation groove 13. The opening of the second installation groove 14 is located on the second surface 12, and the second installation groove 14 is recessed from the second surface 12 toward the first surface 11. The second installation groove 14 includes a first groove bottom wall.

[0083] The end cap 10 further includes a first mounting hole 15 and a second mounting hole 16. The first mounting hole 15 and the second mounting hole 16 are respectively located at both ends of the length direction of the end cap 10. Along the thickness direction of the end cap 10, the first mounting hole 15 penetrates the first surface 11 and the bottom wall of the first groove. The second mounting hole 16 penetrates the first surface 11 and the bottom wall of the first groove. In other embodiments, the structure of the first mounting groove 13 and the structure of the second mounting groove 14 may also be different.

[0084] In this embodiment, the diameter of the first mounting hole 15 is equal to the diameter of the first hole 811 of the first gasket 81. The diameter of the second mounting hole 16 is smaller than the diameter of the second hole 821 of the second gasket 82, and the difference between the diameter of the second mounting hole 16 and the diameter of the second hole 821 is 0.2 mm. The aperture of the second hole 821 is the same as the inner diameter of the recess 425.

[0085] The lower plastic 50 includes a lower plastic body 51. The lower plastic body 51 is roughly a rectangular thin plate. The length of the lower plastic body 51 is the same as the length of the end cover 10, and the width of the lower plastic body 51 is equivalent to the length of the end cover 10, wherein a certain tolerance range is allowed. The lower plastic body 51 includes a third surface 511 and a fourth surface 512, and the third surface 511 and the fourth surface 512 are arranged opposite to each other along the thickness direction of the lower plastic 50. In this embodiment, the lower plastic 50 can be an integral structure made of plastic material; in other embodiments, the lower plastic 50 can also be composed of two sub-lower plastics.

[0086] The lower plastic 50 includes a first avoidance groove 52 and a second avoidance groove 53. The first avoidance groove 52 and the second avoidance groove 53 are respectively located on opposite sides of the length direction of the lower plastic 50. The openings of the first avoidance groove 52 are both located on the fourth surface 512. The first avoidance groove 52 is recessed from the fourth surface 512 to the direction of the third surface 511. The first avoidance groove 52 includes a first bottom wall (not marked in the figure). In this embodiment, the structure of the second avoidance groove 53 is the same as that of the first avoidance groove 52. The opening of the second avoidance groove 53 is located on the fourth surface 512. The second avoidance groove 53 is recessed from the fourth surface 512 to the direction of the third surface 511. The second avoidance groove 53 includes a second bottom wall (not marked in the figure).

[0087] The lower plastic 50 also includes a first boss 54 and a second boss 55. The first boss 54 and the second boss 55 are convexly arranged on the third surface 511 and are respectively located at opposite ends of the length direction of the lower plastic body 51. The first avoidance groove 52 is recessed from the fourth surface 512 to the direction of the third surface 511 and protrudes from the third surface 511 to form the first boss 54. The shape of the first boss 54 matches the shape of the first avoidance groove 52. In this embodiment, the structure of the second boss 55 is the same as that of the first boss 54. The second avoidance groove 53 is recessed from the fourth surface 512 to the direction of the third surface 511 and protrudes from the third surface 511 to form the second boss 55.

[0088] The lower plastic 50 also includes a first assembly hole 58 and a second assembly hole 59. The first assembly hole 58 passes through the table of the first boss 54 and the first bottom wall of the first avoidance groove 52. It can be understood that the first assembly hole 58 passes through the third surface 511 and the first bottom wall, and the first assembly hole 58 is connected to the first avoidance groove 52 for the first pole 21 to pass through. The first assembly hole 58 is a circular hole. In this embodiment, the structure of the second assembly hole 59 is the same as that of the first assembly hole 58. The second assembly hole 59 passes through the table of the second boss 55 and the second bottom wall of the second avoidance groove 53, and the second assembly hole 59 is connected to the second avoidance groove 53 for the second pole 22 to pass through. In other embodiments, the structure of the first assembly hole 58 and the structure of the second assembly hole 59 may be different.

[0089] In this embodiment, the end cap assembly 100 further includes a first sealing ring 63 and a second sealing ring 64. Figure 8 .

[0090] Please also read Figure 8 In this embodiment, the top patch 70, the end cover 10 and the lower plastic 50 are stacked along the Z-axis direction. The second surface 12 of the end cover 10 faces the third surface 511 of the lower plastic 50, and the fourth surface 512 of the lower plastic body 51 faces the housing 400 and faces away from the end cover 10. The first boss 54 of the lower plastic 50 cooperates with the first mounting groove 13 of the end cover 10, that is, the first boss 54 is accommodated in the first mounting groove 13, and the first mounting hole 15 is connected to the first assembly hole 58 of the lower plastic 50 and is coaxially arranged. The table surface of the first boss 54 abuts against the first groove bottom wall of the first mounting groove 13. The second boss 55 of the lower plastic 50 cooperates with the second mounting groove 14 of the end cover 10, that is, the second boss 55 is accommodated in the second mounting groove 14, and the second mounting hole 16 and the second assembly hole 59 are coaxially arranged. The table surface of the second boss 55 abuts against the first groove bottom wall of the second mounting groove 14.

[0091] The first upper plastic 30 is sleeved on the outer periphery of the first pole 21, and the first gasket 81 is sleeved on the first upper plastic body 31. The first pole body 211 sleeved with the first upper plastic 30 and the first gasket 81 passes through the first mounting hole 15 of the end cover 10 and the first assembly hole 58 of the lower plastic 50 in sequence, and extends into the first avoidance groove 52. The aperture of the first hole 811 of the first gasket 81 is the same as the aperture of the first mounting hole 15. The first pole body 211 is located between the first upper plastic body 31 and the end cover 10, and is used to insulate the first pole 21 and the end cover 10. Among them, the first flange 32 protrudes from the first surface 11, the first gasket 81 is located between the end cover 10 and the first flange 32, the first upper plastic body 31 surrounds the first pole body 211, and the first inner ring surface 311 faces the outer periphery of the first pole body 211; the first flange 32 surrounds the first flange 212, and the height of the first flange 32 at least covers the connection (connection interface) of the first metal part 215 and the second metal part 216, that is, along the thickness direction of the end cover assembly, the height of the first flange 32 exceeds the connection (connection interface) of the first metal part 215 and the second metal part 216, and the first flange 32 can protect the first pole 21, avoid the external environment causing corrosion at the edge of the connection interface of the first pole 21 and affect the pole, avoid affecting the energy efficiency of the battery cell, and at the same time, improve product consistency. The top patch 70 is attached to the first surface 11 of the end cover 10, and the second surface 72 faces the first surface 11. The first pole 21 and the second pole 22 pass through the first through hole 73 and the second through hole 74 respectively.

[0092] The first abutting surface 321 abuts against the first surface 11 around the first mounting hole 15, and the first gasket 81 is clamped between the first abutting surface 321 and the first surface 11 around the first mounting hole 15. The first gasket 81 can seal the gap between the first upper plastic 30 and the end cover 10. Along the radial direction of the first pole 21, the first gasket 81 protrudes from the first upper plastic 30, and the outer diameter of the first flange 32 of the first upper plastic 30 is smaller than the outer diameter of the first gasket 81, which can prevent the electrolyte on the end cover 10 from contacting the position where the end cover 10 and the first flange 32 of the first upper plastic body 31 are connected. It can be understood that the electrolyte on the end cover 10 can be prevented from entering the gap between the end cover 10 and the first upper plastic 30. The part of the first gasket 81 protruding from the first upper plastic 30 is clamped between the top patch 70 and the first surface 11.

[0093] The first gasket 81 is thin and elastic, and has no protrusion when the top patch 70 is pasted on it, which does not affect the appearance. The diameter of the first through hole 73 of the top patch 70 of this embodiment is larger than the outer diameter of the first flange 32 of the first upper plastic 30, and smaller than the outer diameter of the first gasket 81. There is a gap B between the hole wall of the first through hole 73 of the top patch 70 and the first upper plastic 30, which can increase the creepage distance of the first pole 21.

[0094] A gap is formed between the first upper plastic body 31 and the first bottom wall of the first avoidance groove 52 of the lower plastic 50, for accommodating the first sealing ring 63. The first pressing block 61 and the first sealing ring 63 are installed in the first avoidance groove 52, and are sleeved on one end of the first pole body 211 located in the first avoidance groove 52. The first sealing ring 63 is clamped between the end cover 10 and the first pressing block 61. The first upper plastic 30 and the first sealing ring 63 seal the first pressing block 61, the lower plastic 50 and the end cover 10.

[0095] Similarly, the assembly relationship between the second pole 22, the second upper plastic 40, the second pressure block 62, the second sealing ring 64, the end cover 10 and the lower plastic 50 can refer to the description of the assembly of the first pole 21 and its related structures, and the effects produced can also refer to the above description, which will not be repeated here. The difference is that the part of the second gasket 82 close to the second mounting hole 16 is clamped between the recess 425 and the first surface 11, and the second gasket 82 can seal the gap between the second upper plastic 40 and the end cover 10. At the same time, the second abutting surface 421 abuts against the first surface 11, and the second upper plastic 40 and the second pole 22 are positively charged, thereby realizing a weak conductive connection between the second pole 22 and the end cover 10; so that the end cover 10 has the same positive potential as the second pole 22 to prevent corrosion by the electrolyte with a negative potential.

[0096] See also Fig. 9 , a schematic diagram of an end cap assembly of a second embodiment of the energy storage device of the present application, the second embodiment differs from the first embodiment in partial structures of the first pole 21 and the second pole 22, and partial structures of the first upper plastic 30 and the second upper plastic 40. The structures of the end cap 10, the lower plastic 50, etc., which are the same as those of the first embodiment, can be referred to the diagram of the first embodiment, and will not be repeated in this embodiment.

[0097] Please also refer to Fig.10 The first pole 21 includes a first pole body 211 and a first flange 212. Along the height direction of the first pole 21, the first pole body 211 is connected to the surface of one side of the first flange 212. In this embodiment, the first flange 212 is a circular block, and the first pole body 211 is protruded on a surface of the first flange 212. The first flange 212 and the first pole body 211 are coaxially arranged.

[0098] See also Fig.11In this embodiment, the first pole 21 is different from the first pole 21 of the first embodiment in that the first flange 212 includes a first step 213 and a first abutment platform 214. Along the thickness direction of the first flange 212, the first step 213 and the first abutment platform 214 are arranged in opposite directions. The surface periphery of the first flange 212 facing away from the first pole body 211 is recessed into the first flange 212 to form the first step 213, and a protrusion is formed in the middle of the first flange 212. The diameter of the protrusion is greater than the diameter of the first pole body 211. The outer peripheral surface of the first flange 212 and the connection portion of the surface connected to the first pole body 211 are recessed in the axial direction of the first upper plastic 30 and form the first abutment platform 214.

[0099] Along the radial direction of the first pole 21, the width of the first step 213 is greater than the width of the first abutment platform 214. That is, the inner diameter of the first abutment platform 214 is greater than the inner diameter of the first step 213, so that in the height direction of the first pole 21, the gap between the first flange 212 and the first upper plastic 30 can be covered by the first step 213 and the first abutment platform 214, which can prevent the external electrolyte from entering the end cover assembly 100 through the gap between the first upper plastic 30 and the first flange 212 of the first pole 21.

[0100] The external structure of the second pole 22 is the same as that of the first pole 21, and includes a second step 223 and a second abutting platform 224. The second step 223 and the second abutting platform 224 are arranged in back-to-back relationship. The specific connection relationship can be referred to the first pole 21, and will not be described here.

[0101] See also Fig.12 The first upper plastic 30 of this embodiment is different from that of the first embodiment in that the first flange 32 includes a first inner side surface 323 and a first inclined surface 324. The first inner side surface 323 is connected to the first step surface 320, and there is an angle between the first inner side surface 323 and the first step surface 320, which is 90 degrees in this embodiment. The first inner side surface 323 is arranged opposite to the outer peripheral surface of the first flange 32. The first inclined surface 324 connects the first inner side surface 323 and the outer peripheral surface of the first flange 32, and the first inclined surface 324 is inclined away from the first inner side surface 323, and the first inclined surface 324 is away from the first abutting surface 321. Specifically, the first inner side surface 323 and the first inclined surface 324 are surfaces of the second portion 32b, and the first inner side surface 323 is connected to the first step surface 320.

[0102] In one embodiment, the connection between the first inner side surface 323 and the first inclined surface 324 is a plane, named as the first plane 3211 , and the first plane 3211 and the first step surface 320 face in the same direction. The first inclined surface 324 is inclined relative to the first plane 3211 .

[0103] The first upper plastic 30 further includes a first vent groove 36. The first vent groove 36 is recessed in the first step surface 320 and extends along the radial direction of the first upper plastic 30. The first vent groove 36 of this embodiment is a strip-shaped groove, and two ends of the first vent groove 36 in the length direction are respectively located at the first inner ring surface 311 and the connection between the first step surface 320 and the first inner side surface 323, and penetrate the first inner ring surface 311. The first vent groove 36 can be one or more. When there are multiple first vent grooves 36, they are arranged at intervals around the axis of the first upper plastic 30.

[0104] In this embodiment, the plastic material of the second upper plastic 40 is also doped with a conductive material and has weak conductivity, such as conductive carbon filaments. The second upper plastic 40 can achieve a weak conductive connection between the second pole 22 and the end cover 10 .

[0105] In this embodiment, the second upper plastic 40 has the same structure as the first upper plastic 30, but is made of different materials. Specifically, the second upper plastic 40 includes a recess 425, a second inner side surface 423, a second inclined surface 424, a second plane 4211, and a second vent groove 46. The specific structure and position of the second inner side surface 423, the second inclined surface 424, the second plane 4211, and the second vent groove 46 can refer to the description of the first upper plastic 30, and will not be repeated here.

[0106] See also Fig.13 The assembly relationship of the end cap 10, the first pole 21 and the second pole 22, the first upper plastic 30 and the second upper plastic 40, the lower plastic 50, the first pressing block 61, the second pressing block 62, the top patch 70, the first gasket 81 and the second gasket 82 can refer to the specific description of the above embodiment.

[0107] This embodiment only describes the differences from the above-mentioned embodiment, and only takes the first pole 21 as an example. Among them, the first upper plastic 30 is sleeved on the outer periphery of the first pole 21, and the surface of the first flange 212 on the periphery of the first pole body 211 is opposite to and abuts against the first step surface 320, and the first flange 212 covers the notch of the first vent 36 located on the first step surface. Along the height direction of the first pole 21, the first abutment platform 214 faces the first flange 32, and the first abutment platform 214 is opposite to and abuts against the first plane 3211 of the first flange 32. The first abutment platform 214 completely covers the first plane 3211, that is, covers the gap between the first flange 212 and the first upper plastic 30; it can prevent the external electrolyte from entering the end cover assembly 100 through the connection gap between the first upper plastic 30 and the first flange 212 of the first pole 21. The first slope 324 can form a drainage slope. If the electrolyte falls onto the first pole 21 or the first slope 324, the electrolyte will flow down along the first slope 324 to prevent external electrolyte from entering the end cover assembly 100 through the connection gap between the first upper plastic 30 and the first flange 212 of the first pole 21.

[0108] Among them, one port of the first vent groove 36 is connected to the gap between the first upper plastic body 31 and the first pole 21, and the other port is located in the gap between the first flange 212 and the first flange 32, thereby connecting the first vent groove 36 to the outside. The first vent groove 36 can make the gas between the first pole 21 and the first upper plastic 30 communicate with the outside, avoiding the first pole 21 and the first upper plastic 30 being too close and not ventilated, resulting in the mistaken assumption that the sealing performance around the first pole is qualified during the sealing test, and avoiding the mistaken assumption that the sealing ring is sealed in place.

[0109] The above are only some embodiments and implementation methods of the present application, and the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any 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 subject to the protection scope of the claims.

Claims

1. An end cap assembly, characterized in that: The end cap assembly includes an end cap, a top patch, a first upper plastic, a second upper plastic, a first pole, a second pole, a first gasket and a second gasket; The first pole includes a first flange, and the second pole includes a second flange; The end cover comprises a first surface and a second surface, the first surface and the second surface are arranged in opposite directions along the thickness direction of the end cover assembly, the end cover further comprises a first mounting hole and a second mounting hole arranged at intervals, the first mounting hole and the second mounting hole both penetrate the first surface and the second surface, The first upper plastic includes a first upper plastic body and a first flange, wherein the first flange is connected to one end of the first upper plastic body and is coaxial with the first upper plastic body; the second upper plastic includes a second upper plastic body and a second flange, wherein the second flange is connected to one end of the second upper plastic body and is coaxial with the second upper plastic body; The first gasket is sleeved on the first upper plastic body, the first upper plastic is sleeved on the first pole, and the first upper plastic body and the first pole are jointly accommodated in the first mounting hole, the first flange and the first flange protrude from the first surface, the first flange surrounds the first flange, and the first gasket is clamped between the first flange and the first surface along the thickness direction of the end cover assembly, and a portion of the first gasket protrudes from the first flange in the radial direction of the first mounting hole; The second gasket is sleeved on the second upper plastic body, the second upper plastic is sleeved on the second pole, the second upper plastic body and the second pole are jointly accommodated in the second mounting hole, the second flange and the second flange protrude from the second surface, the second flange surrounds the outer circumference of the second flange, along the thickness direction of the end cover assembly, the second gasket is clamped between part of the second flange and the first surface, and part of the second flange abuts against the first surface; part of the second gasket protrudes from the second flange along the radial direction of the second mounting hole; The top patch includes a first perforation hole and a second perforation hole, wherein the first perforation hole and the second perforation hole penetrate two surfaces of the top patch in the thickness direction, and the top patch is attached to the first surface, the first perforation hole is sleeved on the outer periphery of the first flange, and the second perforation hole is sleeved on the outer periphery of the second flange, wherein the aperture of the first perforation hole is larger than the outer diameter of the first flange, and the aperture of the second perforation hole is larger than the outer diameter of the second flange.

2. The end cap assembly according to claim 1, characterized in that: The first gasket and the second gasket are elastic and insulating. The thickness of the first gasket is greater than or equal to 0.03 mm and less than or equal to 0.2 mm. The thickness of the second gasket is greater than or equal to 0.03 mm and less than or equal to 0.2 mm.

3. The end cap assembly according to claim 1, characterized in that: The first gasket is interference fit with the first upper plastic, and the second gasket is interference fit with the second upper plastic.

4. The end cap assembly according to claim 1, characterized in that: The first gasket includes a first hole, the aperture of the first hole is equal to the aperture of the first mounting hole, and the second gasket includes a second hole, the aperture of the second hole is larger than the aperture of the second mounting hole; The second flange is provided with a recessed portion, which surrounds the second upper plastic body, and the second upper plastic body passes through the second hole and the second mounting hole; the second gasket is stacked on the first surface and surrounds the second mounting hole, and a portion of the second gasket close to the second mounting hole is clamped between the recessed portion and the first surface.

5. The end cap assembly according to claim 1, characterized in that: The top patch is provided with a first through hole and a second through hole, and the first through hole and the second through hole penetrate the top patch along the thickness direction of the top patch; The diameter of the first through hole is larger than the outer diameter of the first flange of the first upper plastic and smaller than the outer diameter of the first gasket. The diameter of the second through hole is larger than the outer diameter of the second flange of the second upper plastic and smaller than the outer diameter of the second gasket.

6. The end cap assembly according to any one of claims 1 to 5, characterized in that: The first flange includes a first inner side surface and a first inclined surface, wherein the first inclined surface connects the first inner side surface and an outer peripheral surface of the first flange, and the first inclined surface is inclined away from the first inner side surface.

7. The end cap assembly according to claim 6, characterized in that: The first flange further includes a first abutment platform, the first abutment platform faces the same direction as the extension direction of the first pole body, a portion of the outer peripheral side of the first flange is opposite to the first inner side surface, along the axial direction of the first pole, the first abutment platform abuts against the connection between the first inner side surface and the first inclined surface, and the first abutment platform blocks the first method A gap between the flange and the first flange.

8. The end cap assembly according to claim 6, characterized in that: The connection between the first inner side surface and the first inclined surface is a plane.

9. The end cap assembly according to claim 7, characterized in that: The first flange is further provided with a first step, which faces away from the first pole body and surrounds the axis of the first pole body. The first step faces in the opposite direction to the first abutment platform, and the first step completely covers the first abutment platform in the axial direction of the first pole.

10. The end cap assembly according to any one of claims 1 to 5, characterized in that: The first flange includes a first step surface, a first inner side surface and a first inclined surface, the first step surface is connected to the first inner side surface, the first inclined surface connects the first inner side surface and the outer peripheral surface of the first flange, the first step surface faces away from the first upper plastic body, and the first inner side surface and the outer peripheral surface of the first flange are arranged in opposite directions; The first flange is further provided with a first ventilation groove, which is recessed in the first step surface, and two ends of the first ventilation groove in the length direction are respectively located on the inner ring surface of the first upper plastic and at the connection between the first step surface and the first inner side surface.

11. The end cap assembly according to claim 10, characterized in that: An outer diameter of the first flange is greater than an outer diameter of the first flange.

12. The end cap assembly according to claim 10, characterized in that: The second flange includes a second step surface, a second inner side surface and a second inclined surface, the second step surface is connected to the second inner side surface, the second inclined surface connects the second inner side surface and the outer peripheral surface of the second flange, the second step surface faces away from the second upper plastic body, and the second inner side surface and the outer peripheral surface of the second flange are arranged in opposite directions; The second flange is also provided with a second ventilation groove, which is recessed in the second step surface, and two ends of the second ventilation groove in the length direction respectively penetrate the inner ring surface of the second upper plastic and the connection between the second step surface and the second inner side surface; wherein the outer diameter of the second flange is greater than the outer diameter of the second flange.

13. The end cap assembly according to any one of claims 1 to 5, characterized in that: The width of the first gasket in the radial direction is greater than 1.5 mm, and the width of the second gasket in the radial direction is greater than 1.5 mm.

14. An energy storage device, characterized in that: It comprises the end cap assembly, shell and battery cell as described in any one of claims 1 to 13, wherein the battery cell is installed in the shell, and the end cap assembly is installed at one end of the shell and encapsulates the battery cell.

15. An electrical equipment, characterized in that: It comprises the energy storage device as claimed in claim 14, wherein the energy storage device is used to supply power to electrical equipment.

Images