End cover assembly, energy storage device and energy storage system

Abstract

The embodiment of the invention provides an end cover assembly, an energy storage device and an energy storage system. The end cover assembly comprises an end cover, upper plastic and a sealing ring, the end cover comprises a first surface and a second surface, the first surface and the second surface are arranged back to back in the thickness direction of the end cover, the end cover is further provided with a mounting groove, the mounting groove is concavely formed in the first surface and concavely formed towards the second surface, and the first surface is provided with a rough part. And the rough part is arranged around the periphery of the mounting groove. The upper plastic is arranged in the containing groove, part of the upper plastic is opposite to the rough portion in the thickness direction of the end cover assembly, the sealing ring is clamped between the end cover and the upper plastic, and the orthographic projection of the sealing ring on the end cover is completely located in the orthographic projection of the rough portion on the end cover in the thickness direction of the end cover assembly. According to the technical scheme, electrolyte overflowed during liquid injection can be prevented from flowing into the assembling gap between the upper plastic and the end cover, the performance of the upper plastic is guaranteed, and then the use performance and the safety performance of the end cover assembly are guaranteed.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an end cap assembly, an energy storage device, and an energy storage system. Background Technology

[0002] With the development of energy storage technology, users have increasingly higher requirements for the performance of energy storage devices, especially the performance and safety of end cap assemblies. Typically, end cap assemblies include aluminum sheets, terminals, and an upper plastic layer. The terminals pass through the aluminum sheets, and the upper plastic layer is located between the terminals and the aluminum sheets to insulate them.

[0003] However, during the electrolyte injection process of the energy storage device, the electrolyte may remain on the aluminum sheet, thereby corroding the end cap assembly and further affecting the performance and safety of the energy storage device. Summary of the Invention

[0004] This application provides an end cap assembly, an energy storage device, and an energy storage system, which can prevent electrolyte from remaining on the end cap, prevent the end cap assembly from being corroded, and thus ensure the performance and safety of the end cap assembly.

[0005] In a first aspect, embodiments of this application provide an end cap assembly. The end cap assembly includes:

[0006] An end cap, comprising a first surface and a second surface, the first surface and the second surface being disposed opposite to each other along the thickness direction of the end cap, the end cap also having a mounting groove, the mounting groove being recessed in the first surface and recessed towards the second surface, the first surface having a rough portion, the rough portion being disposed around the periphery of the mounting groove.

[0007] Apply plastic and sealing rings.

[0008] The upper plastic is installed in the receiving groove. Along the thickness direction of the end cap assembly, part of the upper plastic is opposite to the rough portion. The sealing ring is sandwiched between the end cap and the upper plastic. Along the thickness direction of the end cap assembly, the orthographic projection of the sealing ring on the end cap is completely located within the orthographic projection of the rough portion on the end cap.

[0009] In one embodiment, the sealing ring is elastic, and the compression of the sealing ring is greater than or equal to 5%.

[0010] In one embodiment, the rough portion includes a plurality of densely arranged regular or irregular protrusions.

[0011] In one embodiment, the upper plastic includes a body segment, a raised ring segment, and an extension segment. The body segment is connected to the extension segment and the raised ring segment, and is arranged at an angle to the extension segment and the raised ring segment, respectively. The body segment has an insulating hole. The extension segment surrounds the periphery of the insulating hole and extends along the central axis of the upper plastic and extends away from the raised ring segment. The raised ring segment protrudes from the outer periphery of the body segment on the side away from the extension segment and is arranged around the central axis of the upper plastic.

[0012] The end cap also includes a pole post through hole, which penetrates the bottom wall of the mounting groove and the second surface, and the pole post through hole communicates with the mounting groove.

[0013] The extension section passes through the pole post through hole, and the body section is installed in the mounting groove. Along the thickness direction of the end cap assembly, the convex ring section and the rough portion are opposite each other, and the projection of the convex ring section and the projection of the rough portion at least partially overlap.

[0014] In one embodiment, along the thickness direction of the end cap assembly, the orthographic projection of the sealing ring on the end cap is completely within the orthographic projection of the convex ring segment on the end cap.

[0015] In one embodiment, the end cap assembly further includes a lower plastic, an electrode post, and a seal. The lower plastic is disposed on the second surface of the end cap, and the electrode post is sequentially disposed through the seal, the lower plastic, the end cap, and the upper plastic. The seal is sandwiched between the end cap, the electrode post, the lower plastic, and the upper plastic.

[0016] In one embodiment, the end cap assembly further includes a pressure block and an electrode post, the body segment forms a receiving groove, and one end of the body segment away from the extension segment forms the opening of the receiving groove, and the pressure block is at least partially received within the receiving groove.

[0017] The receiving groove is a hexagonal groove, and the pressing block is a hexagonal annular block.

[0018] In one embodiment, the end cap assembly further includes a limiting post, which is located within the pressure block, the body segment, and the end cap.

[0019] Secondly, embodiments of this application provide an energy storage device. The energy storage device includes a housing, a battery cell, and an end cap assembly, wherein the end cap assembly is mounted on one end of the battery cell and seals the opening of the housing.

[0020] Thirdly, embodiments of this application provide an energy storage system. The energy storage system includes the energy storage device, which is used to supply power to the energy storage system.

[0021] In related technologies, the end cap assembly includes an aluminum sheet, a terminal post, and an upper plastic layer. The terminal post passes through the aluminum sheet, and the upper plastic layer is located between the terminal post and the aluminum sheet to isolate and insulate them. However, during the manufacturing process of energy storage devices, such as during cell electrolyte injection, a positive and negative pressure cycle is typically used to forcibly inject electrolyte into the cell. When the electrolyte injection is completed and the injection nozzle is removed, the electrolyte inside the cell may overflow and remain on the surface of the aluminum sheet, sometimes even entering the assembly gap between the aluminum sheet and the upper plastic layer. This poses a risk of corrosion to the end cap assembly and may even cause the upper plastic layer to fail, further affecting the performance and safety of the end cap assembly.

[0022] In this embodiment, the end cap assembly further includes a sealing ring, and the upper plastic of the end cap assembly is provided with a raised ring segment, which is disposed opposite to the end cap along the thickness direction of the end cap assembly. The sealing ring is sleeved on the outer periphery of the upper plastic and located between the raised ring segment and the end cap to seal the assembly gap between the upper plastic and the end cap. During the manufacturing process of the energy storage device, electrolyte may remain on the end cap. The sealing ring in this embodiment not only prevents the electrolyte from corroding the end cap and the electrode post, but also prevents the electrolyte on the end cap from spreading into the assembly gap between the upper plastic and the end cap, preventing the electrolyte from affecting the performance of the upper plastic and causing the upper plastic to fail; thus ensuring the safety and performance of the end cap assembly, and consequently ensuring the performance of the energy storage device.

[0023] Furthermore, the first surface of the end cap has a roughened portion. This roughened portion abuts against the sealing ring, further compressing it and thus increasing the sealing effect of the sealing ring on the upper plastic and the end cap. Moreover, the contact area between the roughened portion and the sealing ring increases the contact area between them, which not only lengthens the path for the electrolyte to enter the assembly gap between the upper plastic and the end cap, further preventing the electrolyte from affecting the performance of the upper plastic, but also enhances the assembly reliability between the sealing ring, the end cap, and the upper plastic; thereby further ensuring the safety and performance of the end cap assembly.

[0024] In addition, the rough portion can position the sealing ring, thus preventing the sealing ring from being excessively deformed after compression and potentially failing due to compression. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application;

[0026] Figure 2 for Figure 1 The diagram shows the structural schematic of the energy storage device in the energy storage system.

[0027] Figure 3 for Figure 2 The diagram shows the structural schematic of the end cap assembly of the energy storage device.

[0028] Figure 4 for Figure 3 The diagram shows an exploded view of the end cap assembly.

[0029] Figure 5 for Figure 4 The diagram shows an exploded view of the end cap assembly from another angle.

[0030] Figure 6 for Figure 4 A schematic diagram of the end cap structure of the end cap assembly shown;

[0031] Figure 7 for Figure 4 The diagram shows the structure of the first and second upper plastic parts of the end cap assembly.

[0032] Figure 8 for Figure 7 The diagram shows the structure of the first and second upper plastics from another angle.

[0033] Figure 9 for Figure 7 The diagram shows a cross-sectional view of the first and second upper plastic sheets.

[0034] Figure 10 for Figure 3 The diagram shows a cross-sectional view of the end cap assembly along AA.

[0035] The names corresponding to the markings in the attached drawings are as follows: Energy storage system 4000, high-voltage cable 4100, first power conversion device 4200, second power conversion device 4300, energy storage device 1000, housing 200, opening 201, end cap assembly 100, end cap 10, first surface 11, second surface 12, mounting groove b, pole post through hole d, first mounting groove 13, first groove sidewall 131, first groove bottom wall 132, second mounting groove 14, second groove sidewall 141, second groove bottom wall 142, first pole post through hole 15, second pole post through hole 16, rough part D, first rough part 17, second rough part 18, first limiting groove m1, second limiting groove n1, lower plastic 20, upper... Surface 21, lower surface 22, first through hole 23, second through hole 24, upper plastic B, body segment B1, extension segment B2, convex ring segment B3, insulating hole B4, receiving groove B5, first upper plastic 30, first body segment 31, first segment 311, first outer surface 3111, first inner surface 3112, first end face 3113, second segment 312, first upper surface 3121, first lower surface 3122, first extension segment 32, first inner surface 321, first outer surface 322, first convex ring segment 33, first abutting surface 331, first convex ring surface 332, first outer surface 333, first insulating hole 34, first receiving groove 35, first limiting hole m2, second upper plastic 40, and the first... Second body segment 41, third segment 411, second outer surface 4111, second inner surface 4112, second end face 4113, fourth segment 412, second upper surface 4121, second lower surface 4122, second extension segment 42, second inner surface 421, second outer surface 422, second convex ring segment 43, second abutting surface 431, second convex ring surface 432, second outer surface 433, second insulating hole 44, second receiving groove 45, second limiting hole n2, pressure block C, first pressure block 50, first pressure block surface 51, first pressing surface 52, first through hole 53, second pressure block 60, second pressure block surface 61, second pressing surface 62, second through hole 63, first positioning groove m3, second positioning groove n 3. Sealing ring 70, first sealing ring 71, first sealing surface 711, second sealing surface 712, first outer ring surface 713, first inner ring surface 714, second sealing ring 72, third sealing surface 721, fourth sealing surface 722, second outer ring surface 723, second inner ring surface 724, sealing element 80, first sealing element 81, first sealing body 811, first sealing protrusion 812, second sealing element 82, second sealing body 821, second sealing protrusion 822, pole post 90, first pole post 91, first body 911, first flange 912, second pole post 92, second body 921, second flange 922, limiting post 101, first limiting post M, second limiting post N. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly specified. Furthermore, the terms "same," "equal," or "parallel" used below are all allowed to have certain tolerances.

[0038] It should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of those features.

[0039] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form for future applications. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0040] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak hours, and excessive power during off-peak hours. Unstable voltage can also damage the power grid. Therefore, due to insufficient electricity demand or insufficient grid capacity, solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0041] Taking electrochemical energy storage as an example, this solution provides an energy storage device for use in energy storage systems. The energy storage device is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage media. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage media. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or transferred to places with a shortage of electricity for use.

[0042] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include:

[0043] (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can assist renewable energy power generation in meeting grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the absorption capacity of renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0044] (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and grid congestion relief. In terms of peak shaving, they can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption.

[0045] (3) Small-scale energy storage cabinets applied to the electricity consumption side primarily function to facilitate self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improve power supply reliability. Depending on the application scenario, electricity consumption-side energy storage can be categorized into commercial and industrial energy storage cabinets, residential energy storage devices, and energy storage charging piles, which are generally used in conjunction with distributed photovoltaic systems. Considering that photovoltaic power generation occurs during the day while user loads are typically higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is required in communication base stations, data centers, and other fields for backup power.

[0046] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram of an energy storage system according to an embodiment of this application. Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 1000 of this application is not limited to its generation / distribution side energy storage scenario.

[0047] This application provides an energy storage system 4000, which includes: a high-voltage cable 4100, a first power conversion device 4200, a second power conversion device 4300, and an energy storage device 1000 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 4300 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 1000 through grid connection. The energy storage device 1000 is connected to the high-voltage cable 4100 and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, wind... The wind power conversion device is always connected to the high-voltage cable 4100. Under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 1000 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 1000 together with the high-voltage cable 4100 in grid-connected mode to supply power to the power consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0048] In some embodiments on the distribution network side, the first power conversion device 4200 can be a photovoltaic power conversion device. The energy storage device 1000 is connected to the high-voltage cable 4100 and installed downstream of the high-voltage cable 4100 between the user load and the user load. The power output by the photovoltaic power conversion device is stored in the energy storage device 1000, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails. Alternatively, it can provide power supply support to alleviate line congestion when the high-voltage cable 4100 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0049] Optionally, the first power conversion device may include, but is not limited to, a wind power conversion device, and the second power conversion device may include, but is not limited to, a photovoltaic power conversion device. The first power conversion device 4200 and the second power conversion device 4300 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0050] Optionally, the energy storage device 1000 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, aerospace, charging piles, and electric vehicles.

[0051] Optionally, the energy storage device 1000 may include, but is not limited to, single-cell batteries, or battery modules, battery packs, battery clusters, power banks, energy storage cabinets / containers, and other battery integrated systems composed of single-cell batteries. The actual application form of the energy storage device 1000 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 1000. This application embodiment only uses a multi-cell battery as an example for illustration.

[0052] Optionally, when the energy storage device 1000 is a single battery cell, the energy storage device 1000 can be, but is not limited to, at least one of cylindrical, square, prismatic, or other shaped batteries.

[0053] Optionally, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not specifically limit it.

[0054] Please see Figure 2 , Figure 2 for Figure 1 The diagram shows the structure of the energy storage device in the energy storage system.

[0055] For ease of description, the width direction of the energy storage device 1000 is defined as the X-axis, the length direction as the Y-axis, and the height direction as the Z-axis. The X-axis, Y-axis, and Z-axis are all perpendicular to each other.

[0056] The directional terms such as "upper," "lower," "bottom," "top," "right," and "left" mentioned in the embodiments of this application are based on the appendix to the specification. Figure 2 The description is based on the orientation shown. It does not constitute a limitation on the actual application scenario of the energy storage device 1000. Specifically, the positive direction toward the Z-axis is defined as the top or top of the energy storage device 1000, and the negative direction toward the Z-axis is defined as the bottom or bottom of the energy storage device 1000.

[0057] The energy storage device 1000 includes a housing 200, an end cap assembly 100, and a battery cell (not shown). The housing 200 includes an opening 201 and a receiving cavity (not shown). The opening 201 and the receiving cavity are in communication. The battery cell is housed within the receiving cavity. The end cap assembly 100 is mounted on one end of the battery cell in the height direction (i.e., the Z-axis direction) and seals the opening 201 to isolate the internal environment of the energy storage device 1000 from the external environment.

[0058] Please refer to the following: Figure 3 , Figure 4 and Figure 5 , Figure 3 for Figure 2 The diagram shows the structure of the end cap assembly of the energy storage device. Figure 4 for Figure 3 The diagram shown is an exploded view of the end cap assembly. Figure 5 for Figure 4 The diagram shows an exploded view of the end cap assembly from another angle.

[0059] The end cap assembly 100 includes an end cap 10, a lower plastic 20, an upper plastic B, a pressure block C, a sealing ring 70, a sealing element 80, and a pole post 90. In this embodiment, the lower plastic 20 and the end cap 10 are stacked along the thickness direction (i.e., the Z-axis direction) of the end cap assembly 100. The length direction (i.e., the Y-axis direction) of the lower plastic 20 is the same as or approximately the same as the length direction (i.e., the Y-axis direction) of the end cap 10, and the width direction (i.e., the X-axis direction) of the lower plastic 20 is the same as or approximately the same as the width direction (i.e., the X-axis direction) of the end cap 10. The pole post 90 is sequentially inserted through the lower plastic 20 and the end cap 10. The sealing element 80 is sleeved on the outer periphery of the pole post 90 and is clamped by the pole post 90 and the lower plastic 20. The sealing ring 70, the upper plastic B, and the pressure block C are all located on the side of the end cap 10 opposite to the lower plastic 20, and the sealing ring 70, the upper plastic B, and the pressure block C are sequentially sleeved on the outer periphery of the pole post 90. The upper plastic B is located on the side of the end cap 10 facing away from the lower plastic 20 and presses the sealing ring 70 against the end cap 10. The pressure block C is installed on the side of the upper plastic B facing away from the end cap 10.

[0060] In this embodiment, the upper plastic B includes a first upper plastic 30 and a second upper plastic 40. The pressing block C includes a first pressing block 50 and a second pressing block 60. The sealing ring 70 includes a first sealing ring 71 and a second sealing ring 72. The sealing element 80 includes a first sealing element 81 and a second sealing element 82. The pole post 90 includes a first pole post 91 and a second pole post 92. The first pole post 91, the first upper plastic 30, the first pressing block 50, the first sealing ring 71, and the first sealing element 81 are all located at the same end along the length of the end cap assembly 100. The second pole post 92, the second upper plastic 40, the second pressing block 60, the second sealing ring 72, and the second sealing element 82 are all located at the other end along the length of the end cap assembly 100.

[0061] The structures of the first terminal 91 and the second terminal 92 can be the same or different. The first terminal 91 is the negative terminal, and the second terminal 92 is the positive terminal. Alternatively, the first terminal 91 can be a positive terminal, and the second terminal 92 can be a negative terminal. For example, the first terminal 91 and the second terminal 92 may have different structures, with the first terminal 91 being the negative terminal and the second terminal 92 being the positive terminal.

[0062] The first pole post 91 includes a first body 911 and a first flange 912. Along the height direction (i.e., the Z-axis direction) of the first pole post 91, the first body 911 protrudes from the surface of the first flange 912 on one side along its thickness direction (i.e., the Z-axis direction). Along the height direction of the first pole post 91, the projection of the first body 911 lies entirely within the projection of the first flange 912. In this embodiment, the first pole post 91 is approximately a T-shaped column structure. The first flange 912 is approximately a circular plate. The first body 911 is approximately a circular column.

[0063] The second pole post 92 includes a second body 921 and a second flange 922. Along the height direction (i.e., the Z-axis direction) of the second pole post 92, the second body 921 protrudes from the surface of the second flange 922 on one side along its thickness direction (i.e., the Z-axis direction). Along the height direction of the second pole post 92, the projection of the second body 921 lies entirely within the projection of the second flange 922. In this embodiment, the second pole post 92 is approximately a T-shaped column structure. The second flange 922 is approximately a rectangular plate. The second body 921 is approximately a circular column.

[0064] The first pressing block 50 includes a first pressing surface 51 and a first pressing surface 52. The first pressing surface 51 and the first pressing surface 52 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the first pressing block 50. The first pressing block 50 also includes a first through hole 53. The first through hole 53 passes through the first pressing surface 51 and the first pressing surface 52 of the first pressing block 50. The first through hole 53 is used for the first body 911 of the first pole post 91 to pass through. The first pressing block 50 can be a circular ring block, a rectangular ring block, a polygonal ring block, etc. The first through hole 53 can be a circular hole, a rectangular hole, a polygonal hole, etc. For example, the first pressing block 50 is a hexagonal ring block. The first through hole 53 is a circular hole.

[0065] The second pressing block 60 includes a second pressing surface 61 and a second pressing surface 62. The second pressing surface 61 and the second pressing surface 62 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the second pressing block 60. The second pressing block 60 also includes a second through hole 63. The second through hole 63 passes through the second pressing surface 61 and the second pressing surface 62 of the second pressing block 60. The second through hole 63 is used for the second body 921 of the second pole post 92 to pass through. The second pressing block 60 can be a circular ring block, a rectangular ring block, a polygonal ring block, etc. The second through hole 63 can be a circular hole, a rectangular hole, a polygonal hole, etc. For example, the second pressing block 60 is a hexagonal ring block. The second through hole 63 is a circular hole.

[0066] The first sealing ring 71 includes a first sealing surface 711 and a second sealing surface 712. The first sealing surface 711 and the second sealing surface 712 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the first sealing ring 71. The first sealing ring 71 also includes a first outer ring surface 713 and a first inner ring surface 714. The first outer ring surface 713 and the first inner ring surface 714 are arranged opposite to each other along the radial direction of the first sealing ring 71. The first outer ring surface 713 and the first inner ring surface 714 are both connected to the first sealing surface 711 and the second sealing surface 712. In this embodiment, the first sealing ring 71 is made of a material with elastic deformation capability, such as plastic or rubber. The first sealing ring 71 can be a circular ring, a rectangular ring, a polygonal ring, etc. For example, the first sealing ring 71 is a hexagonal ring.

[0067] The second sealing ring 72 includes a third sealing surface 721 and a fourth sealing surface 722. The third sealing surface 721 and the fourth sealing surface 722 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the second sealing ring 72. The second sealing ring 72 also includes a second outer ring surface 723 and a second inner ring surface 724. The second outer ring surface 723 and the second inner ring surface 724 are arranged opposite to each other along the radial direction of the second sealing ring 72. The second outer ring surface 723 and the second inner ring surface 724 are both connected to the third sealing surface 721 and the fourth sealing surface 722. In this embodiment, the second sealing ring 72 is made of a material with elastic deformation capability, such as plastic or rubber. The second sealing ring 72 can be a circular ring, a rectangular ring, a polygonal ring, etc. For example, the second sealing ring 72 is a hexagonal ring.

[0068] In this embodiment, the first sealing element 81 includes a first sealing body 811 and a first sealing protrusion 812. The first sealing protrusion 812 protrudes from one surface of the first sealing body 811 in the thickness direction, and both the first sealing protrusion 812 and the first sealing body 811 form a hole for the first body 911 of the first pole post 91 to pass through. The outer diameter of the first sealing body 811 is larger than the outer diameter of the first sealing protrusion 812. That is, the cross-section of the first sealing element 81 is trapezoidal. The first sealing element 81 can be made of a material with elastic deformation capability, such as plastic, rubber, etc. The first sealing element 81 can be a circular ring, a rectangular ring, a polygonal ring, etc. For example, the first sealing element 81 is a circular ring.

[0069] In this embodiment, the second sealing element 82 includes a second sealing body 821 and a second sealing protrusion 822. The second sealing protrusion 822 protrudes from one surface of the second sealing body 821 in the thickness direction, and both the second sealing protrusion 822 and the second sealing body 821 form a hole for the second body 921 of the second pole post 92 to pass through. The outer diameter of the second sealing body 821 is larger than the outer diameter of the second sealing protrusion 822. That is, the cross-section of the second sealing element 82 is trapezoidal. The second sealing element 82 can be made of a material with elastic deformation capability, such as plastic, rubber, etc. The second sealing element 82 can be a circular ring, a rectangular ring, a polygonal ring, etc. For example, the second sealing element 82 is always a circular ring.

[0070] Continue reading Figure 4 and Figure 5 In this embodiment, the lower plastic 20 is a long rectangular plate. The lower plastic 20 includes an upper surface 21 and a lower surface 22. The upper surface 21 and the lower surface 22 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the lower plastic 20.

[0071] The lower plastic 20 also includes a first through hole 23 and a second through hole 24. Both the first through hole 23 and the second through hole 24 penetrate the upper surface 21 and the lower surface 22 of the lower plastic 20. The first through hole 23 and the second through hole 24 are located at opposite ends along the length of the lower plastic 20. The first through hole 23 is used for the first body 911 of the first pole post 91 to pass through. The shape of the first through hole 23 is adapted to the shape of the first body 911, and it can be a circular hole, a rectangular hole, a polygonal hole, etc. The second pole post 92 is used for the second body 921 of the second pole post 92 to pass through. The shape of the second through hole 24 is adapted to the shape of the second body 921, and it can be a circular hole, a rectangular hole, a polygonal hole, etc. For example, both the first through hole 23 and the second through hole 24 are circular holes.

[0072] In some embodiments, the end cap assembly 100 further includes a plurality of limiting posts 101. The plurality of limiting posts 101 includes a plurality of first limiting posts M and a plurality of second limiting posts N. The plurality of first limiting posts M are embedded in the first upper plastic 30, the end cap 10, and the first pressing block 50. The plurality of first limiting posts M are used to limit and fix the first pressing block 50, the first upper plastic 30, and the end cap 10. The plurality of second limiting posts N are embedded in the second upper plastic 40, the end cap 10, and the second end cap 10. The plurality of second limiting posts N are used to limit and fix the second pressing block 60, the second upper plastic 40, and the end cap 10. For example, the number of first limiting posts M is three. The number of second limiting posts N is three.

[0073] In an embodiment where the end cap assembly 100 further includes a plurality of first limiting posts M and a plurality of second limiting posts N, the first pressing block 50 also includes a plurality of first positioning grooves m3. The plurality of first positioning grooves m3 are all recessed in the first pressing surface 52 of the first pressing block 50 and are recessed towards the first pressing block surface 51. The plurality of first positioning grooves m3 are spaced apart around the periphery of the first through hole 53, and are also spaced apart from the periphery of the first through hole 53. The first positioning grooves m3 are used to accommodate a portion of the first limiting posts M. The second pressing block 60 also includes a plurality of second positioning grooves n3. The plurality of second positioning grooves n3 are all recessed in the second pressing surface 62 of the second pressing block 60 and are recessed towards the second pressing block surface 61. The plurality of second positioning grooves n3 are spaced apart around the periphery of the second through hole 63, and are also spaced apart from the periphery of the second through hole 63. The second positioning grooves n3 are used to accommodate a portion of the second limiting posts N. Exemplarily, the number of first positioning grooves m3 is three. The number of second positioning slots n3 is three.

[0074] Please see Figure 6 , Figure 6 for Figure 4 The diagram shows the structural diagram of the end cap of the end cap assembly.

[0075] The end cap 10 includes a first surface 11 and a second surface 12. The first surface 11 and the second surface 12 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the end cap 10. In this embodiment, the end cap 10 is a long rectangular plate. The end cap 10 is made of plain aluminum.

[0076] The end cap 10 also includes a mounting groove b. The mounting groove b is recessed into the first surface 11 of the end cap 10 and recessed towards the second surface 12. In this embodiment, the mounting groove b includes a first mounting groove 13 and a second mounting groove 14. The first mounting groove 13 and the second mounting groove 14 are located at opposite ends along the length of the end cap 10. The first mounting groove 13 is used for mounting a first upper plastic 30. The second mounting groove 14 is used for mounting a second upper plastic 40.

[0077] The first mounting groove 13 includes a first groove sidewall 131 and a first groove bottom wall 132. The first groove sidewall 131 is connected to the first groove bottom wall 132 and the upper surface 21, and the first groove sidewall 131, the first groove bottom wall 132, and the upper surface 21 are all set at an included angle. The first mounting groove 13 can be, but is not limited to, a circular groove, a triangular groove, a rectangular groove, etc. For example, the first mounting groove 13 is a hexagonal groove.

[0078] The second mounting groove 14 includes a second groove sidewall 141 and a second groove bottom wall 142. The second groove sidewall 141 is connected to the second groove bottom wall 142 and the upper surface 21, and the second groove sidewall 141, the second groove bottom wall 142, and the upper surface 21 are all arranged at an included angle. The second mounting groove 14 can be, but is not limited to, a circular groove, a triangular groove, a rectangular groove, etc. For example, the second mounting groove 14 is a hexagonal groove.

[0079] The end cap 10 also includes a pole post through hole d. The pole post through hole d penetrates the bottom wall of the mounting groove b and the second surface 12 of the end cap 10. In this embodiment, the pole post through hole d includes a first pole post through hole 15 and a second pole post through hole 16. The first pole post through hole 15 penetrates the first bottom wall 132 of the first mounting groove 13 and the second surface 12 of the end cap 10. The first pole post through hole 15 is used for the first body 911 of the first pole post 91 to pass through. The second pole post through hole 16 penetrates the second bottom wall 142 of the second mounting groove 14 and the second surface 12 of the end cap 10. The second pole post through hole 16 is used for the second body 921 of the second pole post 92 to pass through. The first pole post through hole 15 and the second pole post through hole 16 can be, but are not limited to, circular holes, polygonal holes, rectangular holes, etc. For example, both the first pole post through hole 15 and the second pole post through hole 16 are circular holes.

[0080] In some embodiments, the end cap 10 further includes a rough portion D. The rough portion D can be considered as a plurality of densely arranged regular or irregular protrusions (not shown). Alternatively, the rough portion D can be formed by increasing the roughness by disrupting the continuity of the first surface 11 of the end cap 10, such as a pit structure or a microcrack structure. In this embodiment, the rough portion D includes a first rough portion 17 and a second rough portion 18. Both the first rough portion 17 and the second rough portion 18 are disposed on the first surface 11 of the end cap 10. The first rough portion 17 is disposed around the periphery of the first mounting groove 13. The first rough portion 17 can increase the surface roughness of the first surface 11 around the periphery of the first mounting groove 13. The second rough portion 18 is disposed around the outer periphery of the second mounting groove 14. The second rough portion 18 can increase the surface roughness of the first surface 11 around the periphery of the second mounting groove 14. Both the first rough portion 17 and the second rough portion 18 include a plurality of densely arranged regular or irregular protrusions. It should be noted that... Figure 6 The end caps 10 in the middle are all indicated by dashed lines to show the boundary range of the first rough part 17 and the second rough part 18.

[0081] In an embodiment where the end cap assembly 100 further includes a plurality of first limiting posts M and a plurality of second limiting posts N, the end cap 10 also includes a plurality of first limiting grooves m1 and a plurality of second limiting grooves n1. The plurality of first limiting grooves m1 are all recessed in the bottom wall 132 of the first mounting groove 13 and recessed towards the second surface 12 of the end cap 10. The plurality of first limiting grooves m1 are spaced apart around the periphery of the first pole post through hole 15, and are also spaced apart from the periphery of the first pole post through hole 15. The first limiting grooves m1 are used to accommodate a portion of the first limiting posts M. The plurality of second limiting grooves n1 are all recessed in the bottom wall 142 of the second mounting groove 14 and recessed towards the second surface 12 of the end cap 10. The plurality of second limiting grooves n1 are spaced apart around the periphery of the second pole post through hole 16, and are also spaced apart from the periphery of the second pole post through hole 16. The second limiting groove n1 is used to accommodate part of the second limiting post N. For example, there are three first limiting grooves m1. There are three second limiting grooves n1.

[0082] Please see Figure 7 , Figure 8 and Figure 9 , Figure 7 for Figure 4 The diagram shows the structure of the first and second upper plastic parts of the end cap assembly. Figure 8 for Figure 7 The diagram shown illustrates the structure of the first and second upper plastic components from another angle. Figure 9 for Figure 7 The diagram shows a cross-sectional view of the first and second upper plastic sheets. It should be noted that... Figure 7 The dashed lines indicate the boundary between the first body segment and the first convex ring segment of the first upper plastic, and the boundary between the second body segment and the second convex ring segment of the second upper plastic. Figure 9 The dotted lines in the diagram indicate the dividing lines between the main body section, the extension section, and the convex ring section of the upper plastic.

[0083] The upper plastic component B includes a body segment B1, an extension segment B2, and a convex ring segment B3. The body segment B1 connects to the extension segment B2 and the convex ring segment B3, and is angled to both segments. The body segment B1 has an insulating hole B4. The extension segment B2 surrounds the periphery of the insulating hole B4, extends along the central axis of the upper plastic component B, and extends away from the convex ring segment B3. The convex ring segment B3 protrudes from the outer periphery of the body segment B1 on the side away from the extension segment B2, and surrounds the central axis of the upper plastic component B. The body segment B1 forms a receiving groove B5, and the end of the body segment B1 away from the extension segment B2 forms the opening of the receiving groove B5. The receiving groove B5 is coaxial with and communicates with the insulating hole B4, and the opening of the receiving groove B5 is located on the side of the body segment B1 facing away from the extension segment B2. The receiving groove B5 is used for mounting the pressure block C.

[0084] Specifically, the first upper plastic 30 includes a first body segment 31, a first extension segment 32, and a first convex ring segment 33. The first body segment 31, the first extension segment 32, and the first convex ring segment 33 are connected, and the first body segment 31 is set at an angle to the first extension segment 32 and the first convex ring segment 33, respectively. The first body segment 31 has a first insulating hole 34, and the first extension segment 32 surrounds the periphery of the first insulating hole 34. The first extension segment 32 extends along the central axis of the first upper plastic 30 and extends away from the first convex ring segment 33. The first insulating hole 34 is used for the first body 911 of the first pole post 91 to pass through. The first convex ring segment 33 protrudes from the outer periphery of the first body segment 31 on the side away from the first extension segment 32, and the first convex ring segment 33 is arranged around the central axis of the first upper plastic 30. The first body segment 31 forms a first receiving groove 35. The first receiving groove 35 is coaxial with and connected to the first insulating hole 34, and the opening of the first receiving groove 35 is located on the side of the first body section 31 facing away from the first extension section 32. The first receiving groove 35 is used for mounting the first pressure block 50.

[0085] The first body segment 31 includes a first segment 311 and a second segment 312. The first segment 311 is connected to the outer periphery of the second segment 312, and the first segment 311 and the second segment 312 are arranged at an angle. The first segment 311 is connected to the first convex ring segment 33, and is arranged at an angle to the first convex ring segment 33. The second segment 312 is connected to the first extension segment 32, and is arranged at an angle to the first extension segment 32. The first segment 311 and the second segment 312 form a first receiving groove 35. The first segment 311 forms the sidewall of the first receiving groove 35. The second segment 312 forms the bottom wall of the first receiving groove 35. In this embodiment, the first body segment 31 is an L-shaped ring structure. The first segment 311 is a hexagonal cylindrical structure. The second segment 312 is a hexagonal plate. The first receiving groove 35 is a hexagonal groove.

[0086] The first segment 311 includes a first outer surface 3111 and a first inner surface 3112. The first outer surface 3111 and the first inner surface 3112 are disposed opposite to each other along the thickness direction of the first segment 311. The first inner surface 3112 faces the first receiving groove 35. The first segment 311 includes a first end face 3113. The first end face 3113 is the surface of the first segment 311 that is away from the second segment 312 along the Z-axis direction. The first end face 3113 connects the first outer surface 3111 and the first inner surface 3112.

[0087] The second segment 312 includes a first upper surface 3121 and a first lower surface 3122. The first upper surface 3121 and the first lower surface 3122 are arranged opposite to each other along the thickness direction of the second segment 312. A first insulating hole 34 passes through the first upper surface 3121 and the first lower surface 3122 of the second segment 312. The first upper surface 3121 faces the first receiving groove 35. The first upper surface 3121 is connected to the first inner side surface 3112 of the first segment 311 and is arranged at an angle to the first inner side surface 3112. The first lower surface 3122 is connected to the first outer side surface 3111 of the first segment 311 and is arranged at an angle to the first outer side surface 3111.

[0088] The first extension segment 32 includes a first inner surface 321 and a first outer surface 322. The first inner surface 321 and the first outer surface 322 are disposed opposite to each other along the thickness direction of the first extension segment 32. The first inner surface 321 is connected to the first upper surface 3121 of the second segment 312 and is disposed at an angle to the first upper surface 3121. The first outer surface 322 is connected to the first lower surface 3122 of the second segment 312 and is disposed at an angle to the first lower surface 3122. In this embodiment, the first extension segment 32 is approximately a ring-shaped structure.

[0089] The first convex ring segment 33 includes a first abutting surface 331 and a first convex ring surface 332. The first abutting surface 331 and the first convex ring surface 332 are disposed facing away from each other along the thickness direction of the first convex ring segment 33. The first abutting surface 331 is connected to the first outer side surface 3111 of the first segment 311 and is disposed at an angle to the first outer side surface 3111. The first convex ring surface 332 is connected to the first end surface 3113 of the first segment 311, and the orientation of the first convex ring surface 332 is the same as the orientation of the first end surface 3113. In other embodiments, the first convex ring surface 332 is connected to the first outer side surface 3111 of the first segment 311 and is disposed at an angle to the first outer side surface 3111.

[0090] The first convex ring segment 33 also includes a first outer surface 333. The first outer surface 333 is connected to the first abutting surface 331 and the first convex ring surface 332. The orientation of the first outer surface 333 is the same as the orientation of the first outer side surface 3111 of the first segment 311. In this embodiment, the first convex ring segment 33 is approximately a hexagonal ring structure.

[0091] In an embodiment where the end cap assembly 100 further includes a plurality of first limiting posts M, the first upper plastic 30 also includes a plurality of first limiting holes m2. The plurality of first limiting holes m2 all penetrate the first upper surface 3121 and the first lower surface 3122 of the second segment 312. The plurality of first limiting holes m2 are spaced apart around the periphery of the first insulating hole 34, and are also spaced apart from the periphery of the first insulating hole 34. The first limiting holes m2 are used to allow a portion of the first limiting posts M to pass through. For example, the number of first limiting holes m2 is three.

[0092] In this embodiment, the second upper plastic 40 and the first upper plastic 30 have substantially the same structure. The second upper plastic 40 includes a second body segment 41, a second extension segment 42, and a second convex ring segment 43. The second body segment 41, the second extension segment 42, and the second convex ring segment 43 are connected, and the second body segment 41 is set at an angle to the second extension segment 42 and the second convex ring segment 43, respectively. The second body segment 41 has a second insulating hole 44, and the second extension segment 42 surrounds the periphery of the second insulating hole 44. The second extension segment 42 extends along the central axis of the second upper plastic 40 and extends away from the second convex ring segment 43. The second insulating hole 44 is used for the second body 921 of the second pole post 92 to pass through. The second convex ring segment 43 protrudes from the outer periphery of the second body segment 41 on the side away from the second extension segment 42, and the second convex ring segment 43 extends around the central axis of the second upper plastic 40. The second body segment 41 forms a second receiving groove 45. The second receiving groove 45 communicates with the second insulating hole 44, and the opening of the second receiving groove 45 is located on the side of the second body section 41 facing away from the second extension section 42. The second receiving groove 45 is used for mounting the second pressure block 60.

[0093] The second body segment 41 includes a third segment 411 and a fourth segment 412. The third segment 411 is connected to the outer periphery of the fourth segment 412, and the third segment 411 and the fourth segment 412 are arranged at an angle. The third segment 411 is connected to the second convex ring segment 43, and is arranged at an angle with the second convex ring segment 43. The fourth segment 412 is connected to the second extension segment 42, and is arranged at an angle with the second extension segment 42. The third segment 411 and the fourth segment 412 form a second receiving groove 45. The third segment 411 forms the sidewall of the second receiving groove 45. The fourth segment 412 forms the bottom wall of the second receiving groove 45. In this embodiment, the second body segment 41 is an L-shaped ring structure. The third segment 411 is a hexagonal cylindrical structure. The fourth segment 412 is a hexagonal plate. The second receiving groove 45 is a hexagonal groove.

[0094] The third segment 411 includes a second outer surface 4111 and a second inner surface 4112. The second outer surface 4111 and the second inner surface 4112 are disposed opposite to each other along the thickness direction of the third segment 411. The second inner surface 4112 faces the second receiving groove 45. The third segment 411 includes a second end face 4113. The second end face 4113 is the surface of the third segment 411 away from the fourth segment 412 along the Z-axis direction. The second end face 4113 is connected to the second outer surface 4111 and the second inner surface 4112.

[0095] The fourth segment 412 includes a second upper surface 4121 and a second lower surface 4122. The second upper surface 4121 and the second lower surface 4122 are arranged opposite to each other along the thickness direction of the fourth segment 412. A second insulating hole 44 passes through the second upper surface 4121 and the second lower surface 4122 of the fourth segment 412. The second upper surface 4121 faces the second receiving groove 45. The second upper surface 4121 is connected to the second inner side surface 4112 of the third segment 411 and is arranged at an angle to the second inner side surface 4112. The second lower surface 4122 is connected to the second outer side surface 4111 of the third segment 411 and is arranged at an angle to the second outer side surface 4111.

[0096] The second extension 42 includes a second inner surface 421 and a second outer surface 422. The second inner surface 421 and the second outer surface 422 are disposed opposite to each other along the thickness direction of the second extension 42. The second outer surface 422 is connected to the second upper surface 4121 of the fourth segment 412 and is disposed at an angle to the second upper surface 4121. The second outer surface 422 is connected to the second lower surface 4122 of the fourth segment 412 and is disposed at an angle to the second lower surface 4122. In this embodiment, the second extension 42 is approximately an annular structure.

[0097] The second convex ring segment 43 includes a second abutting surface 431 and a second convex ring surface 432. The second abutting surface 431 and the second convex ring surface 432 are disposed facing away from each other along the thickness direction of the second convex ring segment 43. The second abutting surface 431 is connected to the second outer side surface 4111 of the third segment 411 and is disposed at an angle to the second outer side surface 4111. The second convex ring surface 432 is connected to the second end surface 4113 of the third segment 411, and the orientation of the second convex ring surface 432 is the same as the orientation of the second end surface 4113. In other embodiments, the second convex ring surface 432 is connected to the second outer side surface 4111 of the third segment 411 and is disposed at an angle to the second outer side surface 4111.

[0098] The second convex ring segment 43 also includes a second outer surface 433. The second outer surface 433 is connected to the second abutment surface 431 and the second convex ring surface 432. The orientation of the second outer surface 433 is the same as the orientation of the second outer side surface 4111 of the third segment 411. In this embodiment, the second convex ring segment 43 is approximately a hexagonal ring structure.

[0099] In an embodiment where the end cap assembly 100 further includes a plurality of second limiting posts N, the second upper plastic 40 also includes a plurality of second limiting holes n2. The plurality of second limiting holes n2 all penetrate the second upper surface 4121 and the second lower surface 4122 of the fourth segment 412. The plurality of second limiting holes n2 are spaced apart around the periphery of the second insulating hole 44, and are also spaced apart from the periphery of the second insulating hole 44. The second limiting holes n2 are used to allow a portion of the second limiting posts N to pass through. For example, the number of second limiting holes n2 is three.

[0100] In some embodiments, the structures of the first upper plastic 30 and the second upper plastic 40 may also be different, and this application does not impose any limitations on them.

[0101] Please refer to the following: Figure 4 , Figure 5 and Figure 10 , Figure 10 for Figure 3 The diagram shows a cross-sectional view of the end cap assembly along line AA. It should be noted that the following describes the connection relationships between the components and does not restrict the order in which they are assembled. Figure 10 The dashed lines represent the boundaries of the first rough portion 17 and the second rough portion 18, respectively.

[0102] In this embodiment, the end cap 10 and the lower plastic 20 are stacked and connected along the Z-axis. The upper surface 21 of the lower plastic 20 is connected to the second surface 12 of the end cap 10. The first through hole 23 of the lower plastic 20 and the first pole post through hole 15 of the end cap 10 are coaxial and connected. The second through hole 24 of the lower plastic 20 and the second pole post through hole 16 of the end cap 10 are coaxial and connected.

[0103] The first sealing ring 71 is sleeved on the outer periphery of the first body section 31 of the first upper plastic 30, and the first convex ring section 33 of the first upper plastic 30 presses the first sealing ring 71 onto the end cap 10. The first extension section 32 of the first upper plastic 30 passes through the first pole post through hole 15 of the end cap 10, and the first body section 31 of the first upper plastic 30 is accommodated in the first mounting groove 13 of the end cap 10. Specifically, the first outer surface 322 of the first extension section 32 abuts against the hole wall of the first pole post through hole 15. The first insulating hole 34 formed by the first extension section 32 is coaxially arranged with the first pole post through hole 15 of the end cap 10, and the diameter of the first insulating hole 34 is smaller than the diameter of the first pole post through hole 15. The first lower surface 3122 of the first body section 31 abuts against the first groove bottom wall 132 of the first mounting groove 13. A portion of the first outer surface 3111 of the first body section 31 abuts against the first groove side wall 131 of the first mounting groove 13. The first convex ring segment 33 and the end cap 10 are arranged opposite each other along the Z-axis direction. The first abutting surface 331 of the first convex ring segment 33 faces the first surface 11 of the end cap 10.

[0104] The first sealing ring 71 is located between the first convex ring segment 33 and the end cap 10 in the Z-axis direction. The first inner annular surface 714 of the first sealing ring 71 abuts against a portion of the first outer surface 3111 of the first segment 311. The first sealing surface 711 of the first sealing ring 71 abuts against the first abutting surface 331 of the first convex ring segment 33. The second sealing surface 712 of the first sealing ring 71 abuts against the first surface 11 of the end cap 10.

[0105] In this embodiment, the first sealing ring 71 is compressed by the first convex ring segment 33, the first segment 311, and the end cap 10 to achieve an interference fit with the end cap 10 and the first upper plastic 30. The ratio of the thickness of the first sealing ring 71 after compression to its thickness before compression (i.e., the compression amount of the first sealing ring 71) is greater than or equal to 5%. The first sealing ring 71 can seal the assembly gap between the first upper plastic 30 and the end cap 10 to prevent electrolyte from overflowing and entering the assembly gap between the first upper plastic 30 and the end cap 10 during subsequent liquid injection, thereby preventing electrolyte residue in the assembly gap from affecting the performance of the first upper plastic 30 and ensuring the usability and safety performance of the end cap assembly 100.

[0106] Furthermore, the first outer ring surface 713 of the first sealing ring 71 and the first outer surface 333 of the first convex ring segment 33 have the same orientation, and the first outer ring surface 713 is recessed relative to the first outer surface 333. That is, along the Z-axis direction, the orthographic projection of the first sealing ring 71 on the end cover 10 is completely located within the orthographic projection of the first convex ring segment 33 on the end cover 10. This can also be understood as the first convex ring segment 33 completely covering the first sealing ring 71. This not only prevents the first outer ring surface 713 of the first sealing ring 71 from protruding relative to the first outer surface 333 of the first convex ring segment 33, thus preventing a situation where part of the first sealing ring 71 is compressed while the part protruding from the first convex ring segment 33 is not compressed, thereby avoiding the possibility of compression failure of the first sealing ring 71, but also ensures the appearance performance of the end cover assembly 100.

[0107] The first pressing block 50 is at least partially accommodated within the first receiving groove 35 of the first upper plastic 30. Specifically, the first pressing surface 52 of the first pressing block 50 abuts against the first upper surface 3121 of the second segment 312. The outer peripheral surface of the first pressing block 50 abuts against the first inner surface 321 of the first segment 311. The first through hole 53 of the first pressing block 50 and the first insulating hole 34 of the first upper plastic 30 are coaxial and connected. In this embodiment, the first pressing block 50 is a hexagonal annular block, and the first receiving groove 35 of the first upper plastic 30 is a hexagonal groove. The first pressing block 50 and the first upper plastic 30 cooperate to provide anti-torsion for the subsequent assembly of the first pole post 91.

[0108] The first sealing element 81 is sleeved on the outer periphery of the first pole post 91. The first pole post 91 passes through the lower plastic 20, the end cap 10, the first upper plastic 30, and the first pressing block 50 in sequence, and presses the first sealing element 81 onto the lower plastic 20 and the end cap 10. Specifically, the first sealing element 81 is sleeved on the outer periphery of the first body 911. That is, the first sealing body 811 and the first sealing protrusion 812 of the first sealing element 81 both surround the outer periphery of the first body 911, and the surface of the first sealing body 811 facing away from the first sealing protrusion 812 is connected to the first flange 912. The first body 911 passes through the first through hole 23 of the lower plastic 20, the first pole post through hole 15 of the end cap 10, the first insulating hole 34 of the first upper plastic 30, and the first through hole 53 of the first pressing block 50 in sequence. The first flange 912 and the first body 911 together abut against the first sealing element 81 against the lower plastic 20, the end cap 10 and the first extension section 32, so that the first sealing element 81 is interference-fitted with the lower plastic 20, the end cap 10, the first upper plastic 30 and the first pole 91, thereby achieving insulation and sealing between the lower plastic 20, the end cap 10, the first upper plastic 30 and the first pole 91. That is, the first sealing element 81 not only prevents the electrolyte inside the energy storage device 1000 from leaking outward from the assembly gap between the lower plastic 20, the end cap 10, the first upper plastic 30 and the first pole 91, but also prevents short circuit between the first pole 91 and the end cap 10.

[0109] It is understood that the first seal 81 seals the assembly gap between the lower plastic 20, the end cap 10, the first upper plastic 30, and the first electrode post 91, preventing the electrolyte inside the energy storage device 1000 from flowing out through the end cap assembly 100. Simultaneously, the first sealing ring 71 seals the assembly gap between the first upper plastic 30 and the end cap 10, preventing the injected electrolyte from entering the assembly gap between the first upper plastic 30 and the end cap 10. The cooperation of the first seal 81 and the first sealing ring 71 further enhances the overall sealing performance of the end cap assembly 100, thereby ensuring the performance of the energy storage device 1000.

[0110] In this embodiment, the first pressure block 50 and the first body 911 are connected and fixed by means not limited to welding. The first pressure block 50 and the first flange 912 press together the first upper plastic 30 and the first sealing ring 71. The first upper plastic 30 is provided with a first convex ring section 33, which can increase the creepage distance between the end cap 10 and the first pole post 91, improve electrical reliability, and at the same time reduce the risk of short circuit in the end cap assembly 100 caused by the conductor accidentally touching the first pole post 91 and the end cap 10, thereby improving the safety performance of the end cap assembly 100.

[0111] In an embodiment where a first rough portion 17 is provided on the first surface 11 of the end cap 10, along the Z-axis direction, the orthographic projection of the first convex ring segment 33 on the end cap 10 and the orthographic projection of the first rough portion 17 on the end cap 10 at least partially overlap, and the orthographic projection of the first sealing ring 71 on the end cap 10 lies within the orthographic projection of the first rough portion 17 on the end cap 10. Exemplarily, along the Z-axis direction, the orthographic projection of the first convex ring segment 33 on the end cap 10 and the orthographic projection of the first rough portion 17 on the end cap 10 completely coincide. The first rough portion 17 consists of a plurality of densely arranged protrusions, which can embed into the first sealing ring 71 to further compress the first sealing ring 71, thereby further increasing the compression amount of the first sealing ring 71 and further enhancing the sealing effect of the first sealing ring 71 between the first upper plastic 30 and the end cap 10. Moreover, the multiple protrusions embedded in the first sealing ring 71 increase the contact area between the first sealing ring 71 and the end cap 10, which not only enhances the assembly reliability of the first upper plastic 30, the first sealing ring 71 and the end cap 10, but also increases the path for the electrolyte to enter the assembly gap between the first upper plastic 30 and the end cap 10; thus, the possibility of the electrolyte causing adverse effects on the first upper plastic 30 is further reduced.

[0112] In addition, the first rough portion 17 can also position the first sealing ring 71, preventing the first sealing ring 71 from being excessively deformed away from the direction of the first segment 311 due to compression by the first upper plastic 30 and the end cap 10. This further avoids the first outer ring surface 713 of the first sealing ring 71 from protruding relative to the first outer surface 333 of the first convex ring segment 33, thus preventing the first sealing ring 71 from having the possibility of compression failure, and ensuring the appearance performance of the end cap assembly 100.

[0113] The second sealing ring 72 is sleeved on the outer periphery of the second body section 41 of the second upper plastic 40, and the second convex ring section 43 of the second upper plastic 40 presses the second sealing ring 72 onto the end cap 10. The second extension section 42 of the second upper plastic 40 passes through the second pole post through hole 16 of the end cap 10, and the second body section 41 of the second upper plastic 40 is accommodated in the second mounting groove 14 of the end cap 10. Specifically, the second outer surface 422 of the second extension section 42 abuts against the hole wall of the second pole post through hole 16. The second insulating hole 44 formed by the second extension section 42 is coaxially arranged with the second pole post through hole 16 of the end cap 10, and the diameter of the second insulating hole 44 is smaller than the diameter of the second pole post through hole 16. The second lower surface 4122 of the second body section 41 abuts against the second groove bottom wall 142 of the second mounting groove 14. A portion of the second outer surface 4111 of the second body section 41 abuts against the second groove side wall 141 of the second mounting groove 14. The second convex ring segment 43 is disposed opposite to the end cap 10 along the Z-axis direction. The second abutting surface 431 of the second convex ring segment 43 faces the first surface 11 of the end cap 10.

[0114] The second sealing ring 72 is located between the second convex ring segment 43 and the end cap 10 in the Z-axis direction. The second inner annular surface 724 of the second sealing ring 72 abuts against a portion of the second outer surface 4111 of the third segment 411. The third sealing surface 721 of the second sealing ring 72 abuts against the second abutting surface 431 of the second convex ring segment 43. The fourth sealing surface 722 of the second sealing ring 72 abuts against the first surface 11 of the end cap 10.

[0115] In this embodiment, the second sealing ring 72 is compressed by the second convex ring segment 43, the third segment 411, and the end cap 10 to achieve an interference fit with the end cap 10 and the second upper plastic 40. The ratio of the thickness of the second sealing ring 72 after compression to its thickness before compression (i.e., the compression amount of the second sealing ring 72) is greater than or equal to 5%. The second sealing ring 72 can seal the assembly gap between the second upper plastic 40 and the end cap 10 to prevent electrolyte from overflowing and entering the assembly gap between the second upper plastic 40 and the end cap 10 during subsequent liquid injection, thereby preventing electrolyte residue in the assembly gap from affecting the performance of the second upper plastic 40 and ensuring the usability and safety performance of the end cap assembly 100.

[0116] Furthermore, the second outer ring surface 723 of the second sealing ring 72 and the second outer surface 433 of the second convex ring segment 43 have the same orientation, and the second outer ring surface 723 is recessed relative to the second outer surface 433. That is, along the Z-axis direction, the orthographic projection of the second sealing ring 72 on the end cover 10 is completely located within the orthographic projection of the second convex ring segment 43 on the end cover 10. This can also be understood as the second convex ring segment 43 completely covering the second sealing ring 72. This not only prevents the second outer ring surface 723 of the second sealing ring 72 from protruding relative to the second outer surface 433 of the second convex ring segment 43, thus preventing a situation where part of the second sealing ring 72 is compressed while the part protruding from the second convex ring segment 43 is not compressed, thereby avoiding the possibility of compression failure of the second sealing ring 72, but also ensures the appearance performance of the end cover assembly 100.

[0117] The second pressing block 60 is at least partially accommodated within the second receiving groove 45 of the second upper plastic 40. Specifically, the second pressing surface 62 of the second pressing block 60 abuts against the second upper surface 4121 of the fourth segment 412. The outer peripheral surface of the second pressing block 60 abuts against the second inner surface 421 of the fourth segment 412. The second through hole 63 of the second pressing block 60 and the second insulating hole 44 of the second upper plastic 40 are coaxial and connected. In this embodiment, the second pressing block 60 is a hexagonal annular block, and the second receiving groove 45 of the second upper plastic 40 is a hexagonal groove. The second pressing block 60 and the second upper plastic 40 cooperate to provide anti-torsion for the subsequent assembly of the second pole post 92.

[0118] The second sealing element 82 is sleeved on the outer periphery of the second pole post 92. The second pole post 92 passes through the lower plastic 20, the end cap 10, the second upper plastic 40, and the second pressure block 60 in sequence, pressing the second sealing element 82 onto the lower plastic 20 and the end cap 10. Specifically, the second sealing element 82 is sleeved on the outer periphery of the second body 921. That is, the second sealing body 821 and the second sealing protrusion 822 of the second sealing element 82 both surround the outer periphery of the second body 921, and the surface of the second sealing body 821 facing away from the second sealing protrusion 822 is connected to the second flange 922. The second body 921 passes through the second through hole 24 of the lower plastic 20, the second pole post through hole 16 of the end cap 10, the second insulation hole 44 of the second upper plastic 40, and the second through hole 63 of the second pressure block 60 in sequence. The second flange 922 and the second body 921 together abut against the second seal 82 against the lower plastic 20, the end cap 10, and the second extension 42, so that the second seal 82 is interference-fitted with the lower plastic 20, the end cap 10, the second upper plastic 40, and the second pole 92, thereby achieving insulation and sealing between the lower plastic 20, the end cap 10, the second upper plastic 40, and the second pole 92. That is, the second seal 82 not only prevents the electrolyte inside the energy storage device 1000 from leaking outward from the assembly gap between the lower plastic 20, the end cap 10, the second upper plastic 40, and the second pole 92, but also prevents short circuit between the second pole 92 and the end cap 10.

[0119] It is understood that the second seal 82 seals the assembly gap between the lower plastic 20, the end cap 10, the second upper plastic 40, and the second electrode post 92, preventing the electrolyte inside the energy storage device 1000 from flowing out through the end cap assembly 100. Simultaneously, the second sealing ring 72 seals the assembly gap between the second upper plastic 40 and the end cap 10, preventing the injected electrolyte from entering the assembly gap between the second upper plastic 40 and the end cap 10. The cooperation of the second seal 82 and the second sealing ring 72 further enhances the overall sealing performance of the end cap assembly 100, thereby ensuring the performance of the energy storage device 1000.

[0120] In this embodiment, the second pressure block 60 and the second body 921 are connected and fixed by means not limited to welding. The second pressure block 60 and the second flange 922 press the second upper plastic 40 and the second sealing ring 72 together. The second upper plastic 40 is provided with a second convex ring section 43, which can increase the creepage distance between the end cap 10 and the second pole post 92, improve electrical reliability, and at the same time reduce the risk of short circuit in the end cap assembly 100 caused by the conductor accidentally touching the second pole post 92 and the end cap 10, thereby improving the safety performance of the end cap assembly 100.

[0121] In an embodiment where a second rough portion 18 is provided on the first surface 11 of the end cap 10, along the Z-axis direction, the orthographic projection of the second convex ring segment 43 on the end cap 10 and the orthographic projection of the second rough portion 18 on the end cap 10 at least partially overlap, and the orthographic projection of the second sealing ring 72 on the end cap 10 is completely located within the orthographic projection of the second rough portion 18 on the end cap 10. Exemplarily, along the Z-axis direction, the orthographic projection of the second convex ring segment 43 on the end cap 10 and the orthographic projection of the second rough portion 18 on the end cap 10 completely coincide. The second rough portion 18 is composed of a plurality of densely arranged protrusions, which can embed into the second sealing ring 72 to further compress the second sealing ring 72, thereby further increasing the compression amount of the second sealing ring 72 and further enhancing the sealing effect of the second sealing ring 72 between the second upper plastic 40 and the end cap 10. Moreover, the multiple protrusions embedded in the second sealing ring 72 increase the contact area between the second sealing ring 72 and the end cap 10, which not only enhances the assembly reliability of the second upper plastic 40, the end cap 10 and the second sealing ring 72, but also increases the path for the electrolyte to enter the assembly gap between the second upper plastic 40 and the end cap 10; thus, the possibility of the electrolyte causing adverse effects on the second upper plastic 40 is further reduced.

[0122] In addition, the second rough portion 18 can also position the second sealing ring 72, preventing the second sealing ring 72 from being excessively deformed away from the direction of the third segment 411 due to compression by the second upper plastic 40 and the end cap 10. This further avoids the second outer ring surface 723 of the second sealing ring 72 protruding from the second outer surface 433 of the second convex ring segment 43, thus preventing the second sealing ring 72 from having the possibility of compression failure, and ensuring the appearance performance of the end cap assembly 100.

[0123] like Figure 2 As shown, the battery cell and end cap assembly 100 are mounted in the housing 200. The battery cell is located within the receiving cavity of the housing 200, and the end cap assembly 100 is mounted in the opening 201. The lower plastic 20 is located between the end cap 10 and the battery cell to separate and insulate the battery cell and the end cap 10.

[0124] In embodiments where the end cap assembly 100 further includes multiple first limiting posts M and multiple second limiting posts N, each first limiting hole m2 of the first upper plastic 30 and a first limiting groove m1 of the end cap 10 are coaxial and connected, and each first limiting hole m2 of the first upper plastic 30 and a first positioning groove m3 of the first pressure block 50 are coaxial and connected. It can be understood that one first limiting hole m2 is correspondingly provided and connected to one first limiting groove m1 and one first positioning groove m3. Each first limiting post M is housed within a corresponding connected first limiting hole m2 of the first upper plastic 30, a first limiting groove m1 of the end cap 10, and a first positioning groove m3 of the first pressure block 50. The multiple first limiting posts M can limit and fix the end cap 10, the first upper plastic 30, and the first pressure block 50, and ensure the torsional strength of the first pole post 91 during assembly. Each second limiting hole n2 of the second upper plastic 40 and a second limiting groove n1 of the end cap 10 are coaxial and connected, and each second limiting hole n2 of the second upper plastic 40 and a second positioning groove n3 of the second pressure block 60 are coaxial and connected. It can be understood that one second limiting hole n2 is correspondingly provided and connected to one second limiting groove n1 and one second positioning groove n3. Each second limiting post N is housed within a corresponding connected second limiting hole n2 of the second upper plastic 40, a second limiting groove n1 of the end cap 10, and a second positioning groove n3 of the second pressure block 60. Multiple second limiting posts N can limit and fix the end cap 10, the second upper plastic 40, and the second pressure block 60, and ensure the torsional strength of the second pole post 92 during assembly; thereby ensuring the structural stability of the end cap assembly 100.

[0125] In related technologies, the end cap assembly includes an aluminum sheet, a terminal post, and an upper plastic layer. The terminal post passes through the aluminum sheet, and the upper plastic layer is located between the terminal post and the aluminum sheet to isolate and insulate them. However, during the manufacturing process of energy storage devices, such as during the electrolyte injection process of the battery cell, a positive and negative pressure cycle is usually used to forcibly inject electrolyte into the battery cell. When the electrolyte injection is completed and the injection nozzle is removed, the electrolyte inside the battery cell may overflow and remain on the surface of the aluminum sheet, and sometimes even enter the assembly gap between the aluminum sheet and the upper plastic layer. This poses a risk of corrosion to the end cap assembly and may even cause the upper plastic layer to fail, further affecting the performance and safety of the end cap assembly.

[0126] In this embodiment, the end cap assembly 100 includes a first sealing ring 71 and a second sealing ring 72. The first upper plastic 30 of the end cap assembly 100 includes a first convex ring segment 33, which is disposed opposite to the end cap 10 along the thickness direction of the end cap assembly 100. The first sealing ring 71 is sleeved on the outer periphery of the first upper plastic 30 and located between the first convex ring segment 33 and the end cap 10 to seal the assembly gap between the first upper plastic 30 and the end cap 10. The second upper plastic 40 of the end cap assembly 100 includes a second convex ring segment 43, which is disposed opposite to the end cap 10 along the thickness direction of the end cap assembly 100. The second sealing ring 72 is sleeved on the outer periphery of the second upper plastic 40 and located between the second convex ring section 43 and the end cap 10 to seal the assembly gap between the second upper plastic 40 and the end cap 10. During the manufacturing process of the energy storage device 1000, electrolyte may remain on the first surface 11 of the end cap 10. The first sealing ring 71 of this application embodiment can not only prevent the electrolyte from corroding the end cap 10 and the first electrode 91, but also prevent the electrolyte on the end cap 10 from spreading to the assembly gap between the first upper plastic 30 and the end cap 10. The second sealing ring 72 can not only prevent the electrolyte from corroding the end cap 10 and the second electrode 92, but also prevent the electrolyte on the end cap 10 from spreading to the assembly gap between the second upper plastic 40 and the end cap 10, preventing the electrolyte from affecting the performance of the first upper plastic 30 and the second upper plastic 40, avoiding the failure of the first upper plastic 30 and the second upper plastic 40, thereby ensuring the safety and performance of the end cap assembly 100.

[0127] In this embodiment, the first surface 11 of the end cap 10 is provided with a first rough portion 17 and a second rough portion 18. The first rough portion 17 abuts against the first sealing ring 71, which can further compress the first sealing ring 71, thereby further increasing the sealing effect of the first sealing ring 71 on the first upper plastic 30 and the end cap 10. Moreover, the abutment of the first rough portion 17 against the first sealing ring 71 increases the contact area between the first sealing ring 71 and the end cap 10, which not only lengthens the path for the electrolyte to enter the assembly gap between the first upper plastic 30 and the end cap 10, further preventing the electrolyte from affecting the performance of the first upper plastic 30, but also enhances the assembly reliability between the first sealing ring 71, the end cap 10 and the first upper plastic 30; the second rough portion 18 abuts against the second sealing ring 71 and the second sealing ring 71. The abutment of ring 72 further compresses the second sealing ring 72, thereby further increasing the sealing effect of the second sealing ring 72 on the second upper plastic 40 and the end cap 10. Moreover, the abutment of the first rough portion 17 with the first sealing ring 71 increases the contact area between the second sealing ring 72 and the end cap 10. This not only lengthens the path for the electrolyte to enter the assembly gap between the second upper plastic 40 and the end cap 10, further preventing the electrolyte from affecting the performance of the second upper plastic 40, but also enhances the assembly reliability between the second sealing ring 72, the end cap 10, and the second upper plastic 40; thereby further ensuring the safety and performance of the end cap assembly 100.

[0128] In addition, the first rough portion 17 can position the first sealing ring 71, and the second rough portion 18 can position the second sealing ring 72; thereby avoiding the possibility of excessive deformation of the first sealing ring 71 and the second sealing ring 72 after compression, which could lead to compression failure.

[0129] The above are merely some embodiments and implementation methods of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An end cap assembly, characterized in that, The end cap assembly includes: An end cap, the end cap including a first surface and a second surface, the first surface and the second surface being disposed opposite to each other along the thickness direction of the end cap, the end cap also having a mounting groove, the mounting groove being recessed in the first surface and recessed towards the second surface, the first surface having a rough portion, the rough portion being disposed around the periphery of the mounting groove; Top plastic and sealing ring; The upper plastic is installed in the mounting groove. Along the thickness direction of the end cap assembly, part of the upper plastic is opposite to the rough portion. The sealing ring is sandwiched between the end cap and the upper plastic. Along the thickness direction of the end cap assembly, the orthographic projection of the sealing ring on the end cap is completely located within the orthographic projection of the rough portion on the end cap.

2. The end cap assembly according to claim 1, characterized in that, The sealing ring is elastic, and the compression of the sealing ring is greater than or equal to 5%.

3. The end cap assembly according to claim 1, characterized in that, The rough portion includes a plurality of densely arranged regular or irregular protrusions.

4. The end cap assembly according to claim 1, characterized in that, The upper plastic includes a body segment, a convex ring segment, and an extension segment. The body segment is connected to the extension segment and the convex ring segment, and is set at an angle to the extension segment and the convex ring segment respectively. The body segment has an insulating hole. The extension segment surrounds the periphery of the insulating hole and extends along the central axis of the upper plastic and extends away from the convex ring segment. The convex ring segment protrudes from the outer periphery of the body segment on the side away from the extension segment and is arranged around the central axis of the upper plastic. The end cap also includes a pole post through hole, which penetrates the bottom wall of the mounting groove and the second surface, and the pole post through hole communicates with the mounting groove; The extension section passes through the pole post through hole, and the body section is installed in the mounting groove. Along the thickness direction of the end cap assembly, the convex ring section and the rough portion are opposite each other, and the projection of the convex ring section and the projection of the rough portion at least partially overlap.

5. The end cap assembly according to claim 4, characterized in that, Along the thickness direction of the end cap assembly, the orthographic projection of the sealing ring on the end cap lies entirely within the orthographic projection of the convex ring segment on the end cap.

6. The end cap assembly according to claim 1, characterized in that, The end cap assembly further includes a lower plastic, an electrode post, and a seal. The lower plastic is stacked on the second surface of the end cap. The electrode post passes through the seal, the lower plastic, the end cap, and the upper plastic in sequence. The seal is sandwiched between the end cap, the electrode post, the lower plastic, and the upper plastic.

7. The end cap assembly according to any one of claims 1-6, characterized in that, The end cap assembly further includes a pressure block and an electrode post. The body section forms a receiving groove, and the end of the body section away from the extension section forms the opening of the receiving groove. The pressure block is at least partially received in the receiving groove. The receiving groove is a hexagonal groove, and the pressing block is a hexagonal annular block.

8. The end cap assembly according to claim 7, characterized in that, The end cap assembly further includes a limiting post, which is located within the pressure block, the body segment, and the end cap.

9. An energy storage device, characterized in that, The energy storage device includes a housing, a battery cell, and an end cap assembly as described in any one of claims 1-8, the end cap assembly being mounted on one end of the battery cell and sealing the opening of the housing.

10. An energy storage system, characterized in that, The energy storage system includes the energy storage device as described in claim 9, the energy storage device being used to supply power to the energy storage system.

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