An end cap assembly, an energy storage device, and an electrical device.

Abstract

This application discloses an end cap assembly, an energy storage device, and an electrical device. The end cap assembly includes an end cap, an upper plastic part, and an electrode post. The end cap includes an end cap body, which includes a first surface, a sloping boss, and a through hole. The sloping boss protrudes from the first surface and includes a circumferential surface and a boss surface. The circumferential surface connects the boss surface and the first surface and surrounds the periphery of the boss surface. The upper plastic part includes a body segment, an extension segment, and a protruding segment. The body segment connects to the outer periphery of the extension segment. The extension segment extends along the height direction of the upper plastic part, and the extension direction of the body segment intersects with the extension direction of the extension segment. The protruding segment extends from the outer periphery of the body segment away from the extension segment, and its extension direction is the same as the extension direction of the body segment. The electrode post includes a flange. The upper plastic part and the electrode post are mounted on the end cap, and the body segment is located between the flange and the sloping boss. Along the axis of the protruding segment away from the through hole, one end of the protruding segment away from the through hole protrudes from the circumferential surface and the outer periphery of the flange and is spaced apart from the first surface.

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 electrical appliance. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. Rechargeable batteries use electrolyte. During battery formation, if electrolyte splashes near the terminals, it can easily seep into the battery through the gap between the upper plastic cover and the top cover, remaining there for a long time. This electrolyte can corrode the sealing ring inside the end cover, causing seal failure. Furthermore, the electrolyte may form white crystals due to oxidation or drying, disrupting the uniformity of stress on the inner side of the sealing ring and causing seal failure. Summary of the Invention

[0003] This application provides an end cap assembly, an energy storage device, and an electrical device, which can prevent electrolyte from entering the battery from between the upper plastic and the top cover and affecting the sealing ring, thus ensuring the sealing performance of the sealing ring.

[0004] In a first aspect, this application provides an end cap assembly, the end cap assembly comprising: an end cap, including an end cap body, the end cap body including a first surface, a second surface, and a slanted boss, the first surface and the second surface being disposed opposite to each other along the thickness direction of the end cap body, the slanted boss protruding from the first surface of the end cap body, the slanted boss including a circumferential surface and a boss surface, the circumferential surface connecting the boss surface and the first surface and surrounding the periphery of the boss surface, the end cap body further including a through hole penetrating the second surface and the boss surface, the first surface and the second surface.

[0005] The upper plastic includes a body segment, an extension segment, and a protruding segment. The body segment is connected to the outer periphery of the extension segment. The extension segment extends along the height direction of the upper plastic and the extension direction of the body segment intersects with the extension direction of the extension segment. The extension segment forms an insulating hole. The protruding segment extends from the outer periphery of the body segment away from the extension segment and the extension direction is the same as the extension direction of the body segment.

[0006] The pole includes a flange and a body. The flange includes a top surface and a bottom surface, which are disposed opposite to each other along the thickness direction of the flange. The body protrudes from the bottom surface and extends away from the flange.

[0007] The upper plastic and the pole are mounted on the end cap. The extension section passes through the through hole. The main body passes through the insulating hole and the through hole in sequence. Along the axial direction of the through hole, the main body section is located between the bottom surface of the flange and the inclined boss of the end cap body. Along the axis of the protruding section away from the through hole, one end of the protruding section away from the through hole protrudes from the inclined boss on the inclined circumferential surface and the outer periphery of the flange, and the protruding section is spaced apart from the first surface of the end cap body.

[0008] In one embodiment, the protruding section includes an upper arc surface facing away from the end cap, and the upper arc surface is set at an angle to the first surface of the end cap.

[0009] In one embodiment, the inclined boss includes an inclined peripheral surface and a boss surface, the inclined peripheral surface connects the boss surface and the first surface and surrounds the periphery of the boss surface, and the through hole penetrates the second surface and the boss surface.

[0010] The protruding section also includes a lower arc surface, which is arranged opposite to the upper arc surface along the thickness direction of the protruding section. The lower arc surface and the oblique circumferential surface form a "<" shaped annular notch, which surrounds and faces away from the pole post.

[0011] In one embodiment, the body segment includes an upper surface and a lower surface, which are disposed opposite to each other along the thickness direction of the body segment. The upper surface is opposite to and connected to the bottom surface, and both the upper surface and the bottom surface are parallel to the first surface. The lower surface is opposite to and connected to the boss surface, and both the lower surface and the boss surface are parallel to the first surface.

[0012] The width of the upper surface is less than the width of the lower surface, the width of the upper arc surface is greater than the width of the lower arc surface, and the angle of inclination of the upper arc surface relative to the upper surface is less than the angle of inclination of the lower arc surface relative to the lower surface.

[0013] In one embodiment, the end cap assembly further includes an explosion-proof valve, and the end cap further includes a recess and a reinforcing protrusion. The recess is formed by the second surface being recessed in the direction of the first surface, and the reinforcing protrusion is formed on the first surface, the reinforcing protrusion protruding from the first surface.

[0014] The end cap also includes a pressure relief hole. Along the thickness direction of the end cap, the pressure relief hole penetrates the reinforcing protrusion. Part of the explosion-proof valve is disposed on the end cap and covers the pressure relief hole.

[0015] In one embodiment, the end cap assembly further includes a lower plastic layer, the lower plastic layer and the end cap being stacked along the thickness direction of the end cap assembly.

[0016] The end cap further includes a first annular groove and a second annular groove. The first annular groove is located within the recessed portion, and the second annular groove is recessed within the reinforcing protrusion. Both the first annular groove and the second annular groove are arranged around the periphery of the pressure relief hole and are connected to the hole wall of the pressure relief hole.

[0017] The explosion-proof valve includes an explosion-proof valve plate, a protective plate, and an explosion-proof barrier. The explosion-proof valve plate is housed in the second annular groove, and the protective plate is housed in the first annular groove. The protective plate and the explosion-proof valve plate are opposite to and spaced apart along the thickness direction of the end cap assembly. The explosion-proof barrier is disposed on the lower plastic, and the explosion-proof valve plate is located inside the explosion-proof barrier.

[0018] In one embodiment, the end cap assembly further includes an explosion-proof valve, which includes an explosion-proof valve plate, a protective plate, and an explosion-proof barrier. The explosion-proof barrier is disposed on the lower plastic. The end cap also includes a pressure relief hole, which is opposite to the explosion-proof barrier along the thickness direction of the end cap assembly.

[0019] The end cap further includes multiple reinforcing recesses and multiple inner protrusions. Each reinforcing recess is recessed into the first surface and recessed towards the second surface to form an inner protrusion. Multiple inner protrusions are protruding from the second surface. The multiple reinforcing recesses are arranged side by side along the length direction of the end cap and spaced apart along the width direction of the end cap. The multiple reinforcing recesses are respectively located on both sides of the pressure relief hole along the width direction of the end cap.

[0020] The reinforcing recess extends in the same direction as the length of the end cap, and the length of the reinforcing recess is greater than the width of the explosion-proof valve grille.

[0021] In one embodiment, the lower plastic further includes a plurality of clearance portions, which are recessed into the first surface and recessed into the second surface. The plurality of clearance portions are arranged side by side along the length direction of the lower plastic and spaced apart along the width direction of the lower plastic. The plurality of clearance portions all cross the explosion-proof fence and communicate with the explosion-proof fence. Each of the inner protrusions is contained within one of the clearance portions.

[0022] In one embodiment, the flange is an elliptical block, the main body is an elliptical cylinder, and the through hole is an elliptical hole.

[0023] Secondly, this application provides an energy storage device, which, in addition to the end cap assembly, also includes a housing, the housing including an opening.

[0024] An electrode assembly includes a battery cell, the battery cell comprising a cell body and tabs, the cell body including an upper end face and a lower end face, the upper end face and the lower end face being disposed opposite to each other along the height direction of the cell body, and the tabs extending out of the upper end face. A connector is also included.

[0025] The end cap assembly is mounted on the end of the electrode assembly facing the opening and seals the opening. The connector is located between the electrode assembly and the lower plastic, and the connector connects and conducts between the electrode post and the electrode tab.

[0026] Thirdly, this application provides an electrical device, which includes the energy storage device for supplying power to the electrical device.

[0027] The inventors discovered that when electrolyte seeps into the energy storage device from the outside through the assembly gap between the end cap and the upper plastic, and remains there for a long time, the electrolyte will corrode the sealing ring inside the end cap assembly, causing seal failure. Simultaneously, the residual electrolyte is prone to forming white crystals due to oxidation or drying, which not only disrupts the uniformity of stress on the inner side of the sealing ring, causing seal failure, but also remains in the assembly gap between the end cap and the upper plastic, affecting the appearance and performance of the energy storage device.

[0028] In this embodiment, along the axis away from the through hole, the protruding section extends beyond the outer periphery of the inclined boss of the end cap. Therefore, electrolyte sliding off the upper plastic will not seep into the energy storage device through the assembly gap between the upper plastic and the end cap, preventing the electrolyte from affecting the sealing ring and ensuring its sealing performance. Simultaneously, the protruding section can block the assembly gap between the end cap and the upper plastic, thereby blocking the white crystals formed there, reducing the defect rate of the energy storage device's appearance. Attached Figure Description

[0029] Figure 1 This is an application scenario diagram of the energy storage device provided in the embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the structure of the energy storage device provided in the embodiments of this application;

[0031] Figure 3 for Figure 2 The diagram shows the exploded structure of the energy storage device.

[0032] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of the first and second connectors in the energy storage device shown.

[0033] Figure 5 for Figure 3 An exploded structural diagram of the end cap assembly of the energy storage device shown in the diagram, representing a first embodiment.

[0034] Figure 6 for Figure 5 The end cap assembly shown is an exploded view from another angle.

[0035] Figure 7 for Figure 5 A cross-sectional schematic diagram of a partially exploded structure of the end cap assembly shown;

[0036] Figure 8 for Figure 5 A schematic diagram of the cross-sectional structure of the end cap assembly in the energy storage device shown;

[0037] Figure 9 for Figure 2 The diagram shows a cross-sectional view of the energy storage device along MM.

[0038] Figure 10 for Figure 3 A schematic diagram of the second embodiment of the end cap assembly in the energy storage device is shown.

[0039] Figure 11 for Figure 10 The diagram shows the end cap assembly from another angle.

[0040] Figure 12 for Figure 10 The diagram shows an exploded view of the end cap assembly.

[0041] Figure 13 for Figure 11 The diagram shows an exploded view of the end cap assembly.

[0042] Figure 14 for Figure 12 A schematic diagram of the cross-sectional structure of the end cap in the end cap assembly shown;

[0043] Figure 15 for Figure 14 The diagram shows another cross-sectional view of the end cap.

[0044] The terms corresponding to the reference numerals in the figures are as follows: Energy storage device 1000, outer shell 200, opening 201, receiving cavity 202, end cap assembly 100, end cap 10, end cap body 11, first surface 111, second surface 112, first mounting groove 12, second mounting groove 13, first inclined boss 14, first boss surface 141, first inclined circumferential surface 142, second inclined boss 15, second boss surface 151, second inclined circumferential surface 152, pressure relief hole 16, first annular groove 17, second annular groove 18, limiting groove 19, first through hole 1, second through hole 2, inner recess 113, reinforcing protrusion 114, reinforcing concave portion 115, inner convex bulge 116, lower plastic 20, lower plastic body 21, upper surface 211, lower surface 212, first mounting protrusion 2 2. First protruding surface 221, Second assembly protrusion 23, Second protruding surface 231, First through hole 24, Second through hole 25, Limiting post 26, Clearance part 27, First pole post 30, First body 31, First end face 311, First flange 32, First top surface 321, First bottom surface 322, First step 33, First step surface 331, First pole post through hole 34, First recess 35, Second pole post 40, Second body 41, Second end face 411, Second flange 42, Second top surface 421, Second bottom surface 422, Second step 43, Second step surface 431, Second pole post through hole 44, Second recess 45, First upper plastic 50, First body section 51, First upper surface 511, First lower surface 512, First protruding section 52. First upper arc surface 521, first lower arc surface 522, first extension section 53, first insulating hole 54, second upper plastic 60, second body section 61, second upper surface 611, second lower surface 612, second protruding section 62, second upper arc surface 621, second lower arc surface 622, second extension section 63, second insulating hole 64, first sealing ring 71, first sealing hole 711, second sealing ring 72, second sealing hole 721, first pressure block 80, first connecting hole 801, second pressure block 81, second connecting hole 811, explosion-proof valve 90, explosion-proof fence 91, explosion-proof valve plate 92, protective plate 93, electrode assembly 900, battery cell 910, battery cell body 920, upper end surface 921, lower end surface 922, side surface 923, first electrode Ear 930, second electrode ear 940, first connector 300, first connecting portion 360, first connecting outer surface 361, first connecting inner surface 362, first adapter portion 370, first adapter outer surface 371, first adapter inner surface 372, first groove 373, first protrusion 374, first top surface 375, first peripheral surface 376, first bent portion 380, second connector 400, second connecting portion 460, second connecting outer surface 461, second connecting inner surface 462, second adapter portion 470, second adapter outer surface 471, second adapter inner surface 472, second groove 473, second protrusion 474, second top surface 475, second peripheral surface 476, second bent portion 480, insulating film 500, support member 600, outer wrapping film 700.Protective components 800, primary electrical equipment 3000, secondary electrical equipment 2000, primary power conversion device 4100, secondary power conversion device 4200, energy storage system 5000. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve its 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 based on future application needs. As we all know, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels. Currently, the generation of green electricity generally relies on photovoltaics, wind power, and hydropower. However, wind and solar energy generally suffer from strong intermittency and large fluctuations, which can cause grid instability, insufficient electricity during peak demand periods, and excessive electricity during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it, then releasing the stored energy when needed. Simply put, energy storage is like a large "power bank," storing electrical energy when photovoltaic and wind power are abundant and releasing the stored electricity when needed.

[0049] Taking electrochemical energy storage as an example, this application provides an energy storage device 1000. The energy storage device 1000 is equipped with a set of chemical batteries. It mainly uses the chemical elements in the chemical batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. 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 electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0050] Current energy storage applications are quite widespread, including energy storage on the (wind and solar) power generation side, grid-side energy storage, base station-side energy storage, and user-side energy storage. The corresponding energy storage devices include:

[0051] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0052] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side mainly operate under the "peak shaving and valley filling" mode. Since there are large price differences in electricity prices at peak and valley times depending on electricity demand, users with energy storage equipment usually charge the energy storage cabinet / box during the low electricity price period in order to reduce costs; and release the electricity in the energy storage equipment for use during the peak electricity price period to achieve the purpose of saving electricity costs.

[0053] It should be noted that the aforementioned energy storage containers, small and medium-sized energy storage cabinets, and household small energy storage boxes, which contain energy storage devices 1000, can be understood as electrical equipment.

[0054] Please see Figure 1 , Figure 1 This is an application scenario diagram of the energy storage device provided in the embodiments of this application.

[0055] The energy storage device 1000 provided in this application embodiment is applied to an energy storage system 5000. The energy storage system 5000 includes a first power conversion device 4100 (photovoltaic panel), a second power conversion device 4200 (wind turbine), a first electrical device 3000 (grid), a second electrical device 2000 (base station), and the energy storage device 1000. The energy storage system 5000 also includes an energy storage cabinet, in which the energy storage device 1000 is installed. The energy storage cabinet can be installed outdoors. Specifically, the first power conversion device 4100 can convert solar energy into electrical energy during periods of low electricity prices. The energy storage device 1000 stores this electrical energy and supplies it to the first electrical device 3000 or the second electrical device 2000 during peak electricity demand periods, or provides power when the first electrical device 3000 or the second electrical device 2000 experiences a power outage. The second power conversion device 4200 can convert wind energy into electrical energy. The energy storage device 1000 is used to store the electrical energy and supply it to the first electrical device 3000 or the second electrical device 2000 during peak electricity consumption, or to supply power when the first electrical device 3000 or the second electrical device 2000 experiences a power outage. The electrical energy can be transmitted using high-voltage cables.

[0056] It should be noted that the aforementioned first electrical device 3000, second electrical device 2000, and other devices including the energy storage device 1000 can be understood as electrical devices. The energy storage device 1000 supplies power to the electrical devices.

[0057] The number of energy storage devices 1000 can be multiple, and the multiple energy storage devices 1000 can be connected in series or in parallel. In this embodiment, "multiple" means two or more.

[0058] It is understood that the energy storage device 1000 may include, but is not limited to, single-cell batteries, battery modules, battery packs, and battery systems. 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. For example, the energy storage device 1000 may be a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, or other rechargeable batteries. When the energy storage device 1000 is a single-cell battery, it may be a cylindrical battery, a prismatic battery, or a battery of other shapes. In this embodiment, the energy storage device 1000 is a prismatic battery. The prismatic battery is a rechargeable battery.

[0059] The inventors discovered that during the electrolyte injection process of the energy storage device 1000, electrolyte is prone to splashing near the electrode post. For example, when the injection needle moves, residual electrolyte on the needle may drip onto the electrode post. Furthermore, during the formation of the solid electrolyte interface membrane (SEI) inside the energy storage device 1000, if the electrolyte injection is excessive, the generated bubbles will move towards the top of the device and rupture near the injection hole, spraying the film-like electrolyte above the bubbles out of the injection hole onto the electrode post. If electrolyte seeps into the energy storage device 1000 through the gap between the upper plastic and the end cap and remains there for a long time, it will corrode the sealing ring inside the end cap, causing seal failure. Additionally, the electrolyte may form white crystals due to oxidation or drying, disrupting the uniformity of stress on the inner side of the sealing ring and causing seal failure.

[0060] This application provides the energy storage device 1000 described below, which can prevent electrolyte from entering the battery from between the upper plastic and the top cover and affecting the sealing ring, thus ensuring the sealing performance of the sealing ring.

[0061] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the energy storage device provided in the embodiments of this application. Figure 3 for Figure 2 The diagram shows the exploded structure of the energy storage device.

[0062] For ease of description, the width of the energy storage device 1000 is defined as the X-axis, the length as the Y-axis, and the height as the Z-axis. The X-axis, Y-axis, and Z-axis are all perpendicular to each other.

[0063] The directional terms such as "upper," "top," "lower," "bottom," "left," and "right" mentioned in the embodiments of this application are based on the appendix to the specification. Figure 2 The description of the orientations shown does not constitute a limitation on the actual application scenario of the energy storage device 1000. Specifically, the positive direction towards the Z-axis is defined as the top of the energy storage device 1000, and the negative direction towards the Z-axis is defined as the bottom of the energy storage device 1000. The positive direction towards the X-axis is defined as the left side of the energy storage device 1000, and the negative direction towards the X-axis is defined as the right side of the energy storage device 1000.

[0064] The energy storage device includes an end cap assembly 100, a housing 200, a first connector 300, a second connector 400, an insulating film 500, a support member 600, an outer sheath 700, a protective member 800, and an electrode assembly 900. The housing 200 has an opening 201 and a receiving cavity 202. The opening 201 and the receiving cavity 202 communicate. The electrode assembly 900, the insulating film 500, and the support member 600 are all housed within the receiving cavity 202. The support member 600 is located at the bottom of the electrode assembly 900 and serves to support the electrode assembly 900. The insulating film 500 covers the periphery and bottom of the electrode assembly 900 and separates the support member 600 and the housing 200 from the electrode assembly 900. The end cap assembly 100 is mounted on the end of the electrode assembly 900 facing the opening 201 and seals the opening 201. Along the height direction (Z-axis) of the energy storage device 1000, both the first connector 300 and the second connector 400 connect the end cap assembly 100 and the electrode assembly 900. Along the length direction (Y-axis) of the energy storage device 1000, the first connector 300 and the second connector 400 are spaced apart. An outer film 700 is located on the side of the housing 200 facing away from the electrode assembly 900, and covers the periphery and bottom of the housing 200 and the edge of the end cap assembly 100. A protective member 800 is attached to the surface of the end cap assembly 100 facing away from the electrode assembly 900. The electrode assembly 900 includes multiple battery cells 910. The multiple battery cells 910 are arranged side-by-side along the Y-axis and are fixedly connected by multiple adhesive tapes.

[0065] In this embodiment, the outer casing 200 is an aluminum shell structure. The outer casing 200 is rectangular in shape. Both the protective member 800 and the support member 600 are rectangular sheets. There are two battery cells 910. The first connector 300 and the second connector 400 both connect to the two battery cells 910 and make the two battery cells 910 electrically connected.

[0066] In this embodiment, the battery cell 910 can be a wound structure or a stacked structure. This application does not impose any limitations on this embodiment.

[0067] The battery cell 910 includes a cell body 920 and tabs. The cell body 920 is formed by winding a positive electrode, a negative electrode, and an insulating film 500 located between the positive and negative electrode together. Both the positive and negative electrode include a first portion coated with active material and a second portion of uncoated active material extending outward from the first portion.

[0068] The cell body 920 includes an upper end surface 921 and a lower end surface 922. The upper end surface 921 and the lower end surface 922 are arranged opposite to each other along the height direction (i.e., the Z-axis direction) of the cell body 920. The cell body 920 also includes a side surface 923. The side surface 923 connects the upper end surface 921 and the lower end surface 922 and is disposed around the edges of the upper end surface 921 and the lower end surface 922.

[0069] The electrode includes a first electrode 930 and a second electrode 940. Both the first electrode 930 and the second electrode 940 are connected to and electrically connected to the cell body 920. Along the Z-axis, the first electrode 930 and the second electrode 940 are located on the same side of the cell body 920. Both the first electrode 930 and the second electrode 940 extend from the upper end face 921 of the cell body 920. The first electrode 930 is used to connect to and electrically connect to the first connector 300. The second electrode 940 is used to connect to and electrically connect to the second connector 400. Along the Y-axis, the first electrode 930 and the second electrode 940 are spaced apart. In this embodiment, the first electrode 930 can be a positive electrode, and the second electrode 940 can be a negative electrode. In some other embodiments, the first electrode 930 can be a negative electrode, and the second electrode 940 can be a positive electrode.

[0070] Please refer to the following: Figure 3 and Figure 4 , Figure 4 for Figure 3 The diagram shows the cross-sectional structure of the first and second connectors in the energy storage device.

[0071] In this embodiment, the first connector 300 is made of metal. The first connector 300 includes a first connecting portion 360, a first transition portion 370, and a first bending portion 380. The first bending portion 380 is located between the first connecting portion 360 and the first transition portion 370, and is connected to both the first connecting portion 360 and the first transition portion 370 at an angle. Through the first bending portion 380, the first transition portion 370 can be bent relative to the first connecting portion 360. The first connecting portion 360 is used to connect to and be electrically connected to the first electrode tab 930. The first transition portion 370 is used to connect to and be electrically connected to the end cap assembly 100.

[0072] The first connecting portion 360 includes a first connecting outer surface 361 and a first connecting inner surface 362. The first connecting outer surface 361 and the first connecting inner surface 362 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the first connecting portion 360. In this embodiment, the first connecting portion 360 is a rectangular sheet.

[0073] The first adapter portion 370 includes a first adapter outer surface 371 and a first adapter inner surface 372. The first adapter outer surface 371 and the first adapter inner surface 372 are disposed opposite to each other along the thickness direction (i.e., the Z-axis direction) of the first adapter portion 370. The first adapter portion 370 also includes a first groove 373. The first groove 373 is recessed in the first adapter inner surface 372. The first groove 373 is recessed from the first adapter inner surface 372 toward the first adapter outer surface 371, and protrudes from the first adapter inner surface 372 to form a first convex bulge 374. It can be understood that the first adapter portion 370 also includes the first convex bulge 374, which protrudes from the first adapter outer surface 371. The first convex bulge 374 extends away from the first adapter portion 370. The first convex bulge 374 can be formed by the first adapter portion 370 through a stamping process. The first convex bulge 374 is used to pass through the end cap assembly 100 and connect with the end cap assembly 100. The first convex hull 374 includes a first top surface 375 and a first peripheral surface 376. The first top surface 375 is located away from the first transition outer surface 371, and the orientation of the first top surface 375 is the same as that of the first transition outer surface 371. The first peripheral surface 376 connects the first top surface 375 and the first transition outer surface 371, and surrounds the periphery of the first top surface 375. In this embodiment, the first convex hull 374 is elliptical in shape. The first transition portion 370 is a rectangular sheet.

[0074] It should be noted that, along the Z-axis direction, the first outer surface 371 of the first adapter portion 370 protrudes from the first outer surface 361 of the first connecting portion 360, and the first inner surface 372 of the first adapter portion 370 protrudes from the first outer surface 361 of the first connecting portion 360.

[0075] In this embodiment, the structure of the second connector 400 is the same as that of the first connector 300. The second connector 400 is made of metal. The second connector 400 includes a second connecting portion 460, a second transition portion 470, and a second bending portion 480. The second bending portion 480 is located between the second connecting portion 460 and the second transition portion 470, and is connected to both the second connecting portion 460 and the second transition portion 470 at an angle. Through the second bending portion 480, the second transition portion 470 can be bent relative to the second connecting portion 460. The second connecting portion 460 is used to connect to and be electrically connected with the second electrode 940. The second transition portion 470 is used to connect to and be electrically connected with the end cap assembly 100.

[0076] The second connecting portion 460 includes a second connecting inner surface 462 and a second connecting outer surface 461. The second connecting inner surface 462 and the second connecting outer surface 461 are disposed opposite to each other along the thickness direction (i.e., the Z-axis direction) of the second connecting portion 460. In this embodiment, the second connecting portion 460 is a rectangular sheet.

[0077] The second adapter portion 470 includes a second adapter inner surface 472 and a second adapter outer surface 471. The second adapter inner surface 472 and the second adapter outer surface 471 are disposed opposite to each other along the thickness direction (i.e., the Z-axis direction) of the second adapter portion 470. The second adapter portion 470 also includes a second groove 473. The second groove 473 is recessed in the second adapter inner surface 472. The second groove 473 is recessed from the second adapter inner surface 472 toward the second adapter outer surface 471, and protrudes from the second adapter inner surface 472 to form a second convex bulge 474. It can be understood that the second adapter portion 470 also includes a second convex bulge 474, which protrudes from the second adapter outer surface 471. The second convex bulge 474 extends away from the second adapter portion 470. The second convex bulge 474 can be formed by a stamping process from the second adapter portion 470. The second convex bulge 474 is used to pass through the end cap assembly 100 and connect with the end cap assembly 100. The second convex hull 474 includes a second top surface 475 and a second peripheral surface 476. The second top surface 475 is located away from the second transition outer surface 471, and the orientation of the second top surface 475 is the same as that of the second transition outer surface 471. The second peripheral surface 476 connects the second top surface 475 and the second transition outer surface 471, and surrounds the periphery of the second top surface 475. In this embodiment, the second convex hull 474 is elliptical in shape. The second transition portion 470 is a rectangular sheet.

[0078] It should be noted that, along the Z-axis direction, the second outer surface 471 of the second adapter portion 470 protrudes beyond the second outer surface 461 of the second connecting portion 460, and the second inner surface 472 of the second adapter portion 470 protrudes beyond the second outer surface 461 of the second connecting portion 460.

[0079] Please refer to the following: Figure 5 , Figure 6 and Figure 7 , Figure 5 for Figure 3 The diagram shown is an exploded view of the end cap assembly of the energy storage device according to a first embodiment. Figure 6 for Figure 5 The diagram shown is an exploded view of the end cap assembly from another angle. Figure 7 for Figure 5 A cross-sectional schematic diagram of a partially exploded structure of the end cap assembly shown.

[0080] In this embodiment, the end cap assembly 100 includes an end cap 10, a first electrode post 30, a second electrode post 40, a first upper plastic 50, a second upper plastic 60, a first sealing ring 71, a second sealing ring 72, a lower plastic 20, a first pressing block 80, and a second pressing block 81. The end cap 10 and the lower plastic 20 are stacked along the thickness direction (i.e., the Z-axis direction) of the end cap assembly 100. The first electrode post 30 and the second electrode post 40 are located at opposite ends along the length direction (i.e., the Y-axis direction) of the end cap assembly 100. The first upper plastic 50, the first sealing ring 71, and the first pressing block 80 are sequentially sleeved on the first electrode post 30. The first electrode post 30 is insulated and sealed from the end cap 10 through the cooperation of the first upper plastic 50, the first sealing ring 71, and the lower plastic 20. The second upper plastic 60, the second sealing ring 72, and the second pressing block 81 are sequentially sleeved on the second electrode post 40. The second electrode 40 is insulated and sealed to the end cap 10 through the cooperation of the second upper plastic 60, the second sealing ring 72, and the lower plastic 20. The first electrode 30 can be defined as the positive electrode, and the second electrode 40 can be defined as the negative electrode. In other embodiments, the first electrode 30 can also be defined as the negative electrode, and the second electrode 40 can be defined as the positive electrode. The end cap assembly 100 also includes an explosion-proof valve 90. The explosion-proof valve 90 is used to discharge gas inside the energy storage device 1000 to relieve pressure and prevent the risk of explosion due to gas accumulation inside the energy storage device 1000. The explosion-proof valve 90 includes an explosion-proof barrier 91, an explosion-proof valve plate 92, and a protective plate 93. The explosion-proof barrier 91 is located on the lower plastic 20. The explosion-proof valve plate 92 and the protective plate 93 are both mounted on the end cap 10 and are spaced apart along the Z-axis. The explosion-proof valve plate 92 completely covers the explosion-proof barrier 91. That is, along the Z-axis direction, the orthogonal projection of the explosion-proof valve 90 on the lower plastic 20 is located inside the explosion-proof fence 91.

[0081] See Figure 5 and Figure 6 In this embodiment, the end cap 10 is approximately rectangular in shape. The end cap 10 is made of smooth aluminum sheet. The end cap 10 includes an end cap body 11. The end cap body 11 includes a first surface 111 and a second surface 112. The first surface 111 and the second surface 112 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the end cap body 11.

[0082] See Figure 6 and Figure 7The end cap 10 includes a first mounting groove 12 and a second mounting groove 13. The first mounting groove 12 and the second mounting groove 13 are located at opposite ends of the end cap body 11 along its length. Both the first mounting groove 12 and the second mounting groove 13 are recessed into the second surface 112 of the end cap body 11. The first mounting groove 12 is recessed from the second surface 112 toward the first surface 111 and forms a first inclined boss 14. The first mounting groove 12 is used to accommodate a first sealing ring 71 and a first pressing block 80. The second mounting groove 13 is recessed from the second surface 112 toward the first surface 111 and forms a second inclined boss 15. The second mounting groove 13 is used to accommodate a second sealing ring 72 and a second pressing block 81. In addition, the first mounting groove 12 and the second mounting groove 13 also respectively accommodate a portion of the lower plastic 20. It can be understood that the end cap 10 also includes a first inclined boss 14 and a second inclined boss 15. The first inclined boss 14 and the second inclined boss 15 are located at opposite ends of the end cap body 11 along its length. The first inclined boss 14 and the second inclined boss 15 both protrude from the first surface 111 of the end cap body 11. In this embodiment, the first mounting groove 12 and the second mounting groove 13 are both elliptical in shape. The first inclined boss 14 and the second inclined boss 15 are both elliptical in shape.

[0083] The first inclined boss 14 includes a first boss surface 141 and a first inclined circumferential surface 142. The first boss surface 141 is located away from the first surface 111, and the orientation of the first boss surface 141 is the same as that of the first surface 111. The first inclined circumferential surface 142 connects the first boss surface 141 and the first surface 111 of the end cap body 11. The first inclined circumferential surface 142 is inclined toward the first boss surface 141. That is, the first inclined circumferential surface 142 is an inclined surface or an arc-shaped surface.

[0084] The second inclined boss 15 includes a second boss surface 151 and a second inclined circumferential surface 152. The second boss surface 151 is located away from the first surface 111, and the orientation of the second boss surface 151 is the same as that of the first surface 111. The second inclined circumferential surface 152 connects the second boss surface 151 and the first surface 111. The second inclined circumferential surface 152 is inclined towards the second boss surface 151. That is, the second inclined circumferential surface 152 is an inclined surface or an arc-shaped surface.

[0085] The end cap 10 also includes a first through hole 1 and a second through hole 2. The first through hole 1 extends through the first boss surface 141 of the first inclined boss 14 and the bottom wall of the first mounting groove 12. The first through hole 1 is used for the first pole post 30 to pass through. The second through hole 2 extends through the second boss surface 151 of the second inclined boss 15 and the bottom wall of the second mounting groove 13. The second through hole 2 is used for the second pole post 40 to pass through.

[0086] The end cap 10 also includes a pressure relief hole 16. Along the Y-axis, the pressure relief hole 16 is located between the first through hole 1 and the second through hole 2, and is spaced apart from both. The pressure relief hole 16 extends through the first surface 111 and the second surface 112 of the end cap body 11. The pressure relief hole 16 allows gas inside the energy storage device 1000 to pass through and be discharged to the outside of the energy storage device 1000.

[0087] The end cap 10 also includes a first annular groove 17 and a second annular groove 18. The first annular groove 17 is recessed in the first surface 111 and recessed towards the second surface 112. The first annular groove 17 connects to the wall of the pressure relief hole 16 and surrounds the periphery of the pressure relief hole 16. The first annular groove 17 is used to accommodate the protective plate 93. The second annular groove 18 is recessed in the second surface 112 and recessed towards the first surface 111. The second annular groove 18 connects to the wall of the pressure relief hole 16 and surrounds the periphery of the pressure relief hole 16. The second annular groove 18 is used to accommodate the explosion-proof valve plate 92.

[0088] In some embodiments, such as Figure 6 As shown, the end cap 10 also includes a plurality of limiting grooves 19. The plurality of limiting grooves 19 are all recessed into the second surface 112. The limiting grooves 19 are used to accommodate a portion of the lower plastic 20. Exemplarily, the number of limiting grooves 19 is four. Two limiting grooves 19 are located on one side of the outer periphery of the first assembly groove 12 and are symmetrically arranged about the central axis of the length direction of the end cap 10. The other two limiting grooves 19 are located on one side of the outer periphery of the second assembly groove 13 and are symmetrically arranged about the central axis of the length direction of the end cap 10.

[0089] See Figure 5 and Figure 6 The lower plastic body 20 includes a lower plastic body 21. The lower plastic body 21 includes an upper surface 211 and a lower surface 212. The upper surface 211 and the lower surface 212 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the lower plastic body 21.

[0090] The lower plastic 20 also includes a first mounting protrusion 22 and a second mounting protrusion 23. The first mounting protrusion 22 and the second mounting protrusion 23 are located at opposite ends of the lower plastic 20 along its length (i.e., the Y-axis direction). Both the first mounting protrusion 22 and the second mounting protrusion 23 protrude from the upper surface 211. The first mounting protrusion 22 is received in the first mounting groove 12 of the end cap 10. The first mounting protrusion 22 includes a first protruding surface 221. The first protruding surface 221 is away from the upper surface 211, and the orientation of the first protruding surface 221 is the same as the orientation of the upper surface 211. The second mounting protrusion 23 is received in the second mounting groove 13 of the end cap 10. The second mounting protrusion 23 includes a second protruding surface 231. The second protruding surface 231 is away from the upper surface 211, and the orientation of the second protruding surface 231 is the same as the orientation of the upper surface 211.

[0091] The lower plastic part 20 also includes a first through hole 24 and a second through hole 25. Along the Z-axis, the first through hole 24 extends through the first protruding surface 221 and the lower surface 212. The first through hole 24 allows the first electrode post 30 to pass through. The second through hole 25 extends through the second protruding surface 231 and the lower surface 212. The second through hole 25 allows the second electrode post 40 to pass through.

[0092] Alternatively, the first mounting protrusion 22 surrounds the periphery of the first through hole 24 and connects to the wall of the first through hole 24. The second mounting protrusion 23 surrounds the periphery of the second through hole 25 and connects to the wall of the second through hole 25.

[0093] In some embodiments, the lower plastic 20 further includes a plurality of limiting posts 26. The plurality of limiting posts 26 protrude from the upper surface 211. The limiting posts 26 are received within limiting grooves 19. Exemplarily, the number of limiting posts 26 matches the number of limiting grooves 19. The number of limiting posts 26 is four. Two limiting posts 26 are located on one side of the outer periphery of the first mounting protrusion 22 and are symmetrically arranged about the central axis of the lower plastic 20 in the length direction. The other two limiting posts 26 are located on one side of the outer periphery of the second mounting protrusion 23 and are symmetrically arranged about the central axis of the lower plastic 20 in the length direction.

[0094] See Figure 7 In this embodiment, the first pole post 30 is generally a T-shaped cylindrical structure. The first pole post 30 includes a first body 31 and a first flange 32. Along the height direction (i.e., the Z-axis direction) of the first pole post 30, the first body 31 is connected to a surface on one side of the first flange 32. The first flange 32 is an elliptical block, which includes a first top surface 321 and a first bottom surface 322. The first top surface 321 and the first bottom surface 322 are arranged opposite to each other along the thickness direction of the first flange 32. The first body 31 protrudes from the first bottom surface 322 of the first flange 32. The first body 31 includes a first end face 311. The first end face 311 is away from the first flange 32, and its orientation is the same as that of the first bottom surface 322 of the first flange 32. The first body 31 and the first flange 32 are coaxially arranged. The first body 31 is an elliptical cylinder.

[0095] The first pole post 30 also includes a first step 33. The first step 33 is disposed around the outer periphery of the first body 31. The first step 33 is formed by cutting the periphery of a portion of the end of the first body 31, or it can be understood as the first step 33 being formed by recessing a portion of the end of the first body 31 toward the center of the first body 31. The first step 33 includes a first step surface 331. The first step surface 331 is disposed away from the first flange 32, and the orientation of the first step surface 331 is the same as the orientation of the first bottom surface 322. In this embodiment, the first step surface 331 is an annular surface.

[0096] The first pole post 30 also includes a first pole post through hole 34. The first pole post through hole 34 penetrates both sides of the first flange 32 and the first body 31 in the thickness direction, that is, the first pole post through hole 34 penetrates the first top surface 321 of the first flange 32 and the first end face 311 of the first body 31. The first pole post through hole 34 is used for the first convex 374 to pass through, and the hole wall of the first pole post through hole 34 is used to abut against the first circumferential surface 376 of the first convex 374. In this embodiment, the first pole post through hole 34 is an elliptical hole.

[0097] The first pole post 30 also includes a first recess 35. The first recess 35 is recessed in the first top surface 321 of the first flange 32 and is recessed towards the first end face 311 of the first body 31. The first recess 35 is disposed around the periphery of the first pole post through hole 34 and communicates with the first pole post through hole 34. The first recess 35 is used to accommodate the weld generated when the first protrusion 374 is welded to the first pole post 30. In this embodiment, the first recess 35 is an elliptical groove. The radial dimension of the first recess 35 is smaller than the radial dimension of the first body 31.

[0098] In this embodiment, the structure of the second pole post 40 is similar to that of the first pole post 30. In this embodiment, the second pole post 40 is approximately a cylindrical structure with a T-shaped cross-section. The second pole post 40 includes a second body 41 and a second flange 42. Along the height direction (i.e., the Z-axis direction) of the second pole post 40, the second body 41 is connected to a surface on one side of the second flange 42. The second flange 42 is an elliptical block, including a second top surface 421 and a second bottom surface 422. The second top surface 421 and the second bottom surface 422 are arranged opposite to each other along the thickness direction of the second flange 42. The second body 41 protrudes from the second bottom surface 422 of the second flange 42. The second body 41 includes a second end face 411. The second end face 411 is away from the second flange 42, and its orientation is the same as the second bottom surface 422 of the second flange 42. The second body 41 and the second flange 42 are coaxially arranged. The second body 41 is an elliptical cylinder.

[0099] The second pole post 40 also includes a second step 43. The second step 43 is disposed around the outer periphery of the second body 41. The second step 43 is formed by cutting the periphery of a portion of the end of the second body 41, or it can be understood as the second step 43 being formed by recessing a portion of the end of the second body 41 toward the center of the second body 41. The second step 43 includes a second step surface 431. The second step surface 431 is disposed away from the second flange 42, and the orientation of the second step surface 431 is the same as the orientation of the first bottom surface 322. In this embodiment, the second step surface 431 is an annular surface.

[0100] The second pole post 40 also includes a second pole post through hole 44. The second pole post through hole 44 penetrates both sides of the second flange 42 and the second body 41 in the thickness direction, that is, the second pole post through hole 44 penetrates the first bottom surface 322 of the second flange 42 and the second end face 411 of the second body 41. The second pole post through hole 44 is used for the second protrusion 474 to pass through, and the hole wall of the second pole post through hole 44 is used to abut against the second circumferential surface 476 of the second protrusion 474. In this embodiment, the second pole post through hole 44 is an elliptical hole.

[0101] The second pole post 40 also includes a second recess 45. The second recess 45 is recessed into the second top surface 421 of the second flange 42 and is recessed towards the second end face 411 of the second body 41. The second recess 45 surrounds the periphery of the second pole post through hole 44 and communicates with it. The second recess 45 is used to accommodate the weld seam generated during the welding of the second protrusion 474 and the second pole post 40. In this embodiment, the second recess 45 is an elliptical groove. The radial dimension of the second recess 45 is smaller than the radial dimension of the second body 41.

[0102] See you later Figure 7 , Figure 7 The dashed line represents the boundary between the first body segment 51, the first protruding segment 52, and the first extension segment 53, and also represents the boundary between the second body segment 61, the second protruding segment 62, and the second extension segment 63. In this embodiment, the edge of the first upper plastic 50 is formed in a saucer shape.

[0103] The first upper plastic 50 includes a first body segment 51, a first protruding segment 52, and a first extending segment 53. The first body segment 51 connects to the outer periphery of the first extending segment 53, and the first extending segment 53 extends along the height direction (i.e., the Z-axis direction) of the first upper plastic 50. The extending direction of the first body segment 51 intersects the extending direction of the first extending segment 53, and the first extending segment 53 forms a first insulating hole 54. The first insulating hole 54 is an elliptical hole. The first protruding segment 52 extends from the outer periphery of the first body segment 51 away from the first extending segment 53, and the extending direction is the same as the extending direction of the first body segment 51. The first body segment 51 includes a first upper surface 511 and a first lower surface 512. The first upper surface 511 and the first lower surface 512 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the first body segment 51. The first protruding segment 52 includes a first upper arc surface 521 and a first lower arc surface 522. The first upper arc surface 521 and the first lower arc surface 522 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the first protruding segment 52. The first upper arc surface 521 connects to the first upper surface 511 of the first body segment 51 and is inclined relative to the first upper surface 511, and the first lower arc surface 522 connects to the first lower surface 512 of the first body segment 51 and is inclined relative to the first lower surface 512. In this embodiment, both the first upper surface 511 and the first lower surface 512 are planar. Both the first upper arc surface 521 and the first lower arc surface 522 are arc-shaped surfaces.

[0104] It should be noted that the width of the first upper surface 511 is smaller than the width of the first lower surface 512. The width of the first upper arc surface 521 is greater than the width of the first lower arc surface 522. The angle of inclination of the first upper arc surface 521 relative to the first upper surface 511 is smaller than the angle of inclination of the first lower arc surface 522 relative to the first lower surface 512. It can be understood that the inclination of the first upper arc surface 521 is smaller than the inclination of the first lower arc surface 522.

[0105] In this embodiment, the structure of the second upper plastic 60 is the same as that of the first upper plastic 50. The edge of the first upper plastic 50 is formed in a saucer shape. The second upper plastic 60 includes a second body segment 61, a second protruding segment 62, and a second extending segment 63. The second body segment 61 connects to the outer periphery of the second extending segment 63, and the second extending segment 63 extends along the height direction (i.e., the Z-axis direction) of the second upper plastic 60. The extending direction of the second body segment 61 intersects with the extending direction of the first extending segment 53, and the second extending segment 63 forms a second insulating hole 64. The second insulating hole 64 is an elliptical hole. The second protruding segment 62 extends from the second body segment 61 away from the outer periphery of the second extending segment 63, and the extending direction is the same as the extending direction of the second body segment 61. The second body segment 61 includes a second upper surface 611 and a second lower surface 612. The second upper surface 611 and the second lower surface 612 are arranged opposite to each other along the thickness direction (i.e., the Z-axis direction) of the second body segment 61. The second protruding segment 62 includes a second upper arc surface 621 and a second lower arc surface 622. The second upper arc surface 621 and the second lower arc surface 622 are disposed opposite to each other along the thickness direction (i.e., the Z-axis direction) of the second protruding segment 62. The second upper arc surface 621 connects to the second upper surface 611 of the second body segment 61 and is inclined relative to the second upper surface 611. The second lower arc surface 622 connects to the second lower surface 612 of the second body segment 61 and forms an angle with the second lower surface 612. In this embodiment, both the second upper surface 611 and the second lower surface 612 are planar. Both the second upper arc surface 621 and the second lower arc surface 622 are arc-shaped surfaces.

[0106] It should be noted that the width of the second upper surface 611 is smaller than the width of the second lower surface 612. The width of the second upper arc surface 621 is greater than the width of the second lower arc surface 622. The angle of inclination of the second upper arc surface 621 relative to the second upper surface 611 is smaller than the angle of inclination of the second lower arc surface 622 relative to the second lower surface 612. It can be understood that the inclination of the second upper arc surface 621 is smaller than the inclination of the second lower arc surface 622.

[0107] See Figure 5 and Figure 6The first sealing ring 71 is used to insulate and seal the first electrode post 30 from the end cap 10. The first sealing ring 71 includes a first sealing hole 711. The first sealing hole 711 extends through both surfaces of the first sealing ring 71 in the thickness direction. The first sealing hole 711 is used for the first electrode post 30 to pass through. In this embodiment, the first sealing ring 71 is elliptical in shape. The first sealing hole 711 is an elliptical hole.

[0108] In this embodiment, the structure of the second sealing ring 72 is the same as that of the first sealing ring 71. The second sealing ring 72 is used to insulate and seal the second pole post 40 from the end cap 10. The second sealing ring 72 includes a second sealing hole 721. The second sealing hole 721 extends through both surfaces of the second sealing ring 72 in the thickness direction. The second sealing hole 721 is used for the second pole post 40 to pass through. The second sealing ring 72 is elliptical in shape. The second sealing hole 721 is an elliptical hole.

[0109] The first pressure block 80 is used to press the first sealing ring 71 toward the first flange 32 and deform the first sealing ring 71. The first pressure block 80 includes a first connecting hole 801. The first connecting hole 801 extends through both surfaces of the first pressure block 80 in the thickness direction. The first connecting hole 801 is used for the first pole post 30 to pass through. In this embodiment, the first pressure block 80 is elliptical in shape. The first connecting hole 801 is an elliptical hole.

[0110] In this embodiment, the structure of the second pressure block 81 is the same as that of the first pressure block 80. The second pressure block 81 is used to press the second sealing ring 72 toward the second flange 42 and deform the second sealing ring 72. The second pressure block 81 includes a second connecting hole 811. The second connecting hole 811 extends through both surfaces of the second pressure block 81 in the thickness direction. The second connecting hole 811 is used for the second pole post 40 to pass through. The second pressure block 81 is elliptical in shape. The second connecting hole 811 is an elliptical hole.

[0111] Please refer to the following: Figure 8 , Figure 8 for Figure 5 The diagram shows a cross-sectional view of the end cap assembly in the energy storage device.

[0112] The first pole post 30, the second pole post 40, the first upper plastic 50, the second upper plastic 60, the first sealing ring 71, the second sealing ring 72, the lower plastic 20, the explosion-proof valve 90, the first pressure block 80 and the second pressure block 81 are mounted together on the end cover 10 to form the end cover assembly 100.

[0113] The explosion-proof barrier 91 of the explosion-proof valve 90 is located on the lower plastic body 21. Along the Y-axis, the explosion-proof barrier 91 is positioned between the first mounting protrusion 22 and the second mounting protrusion 23, and is spaced apart from them. The explosion-proof valve plate 92 of the explosion-proof valve 90 is housed in the first annular groove 17 of the end cover 10, while the protective plate 93 of the explosion-proof valve 90 is housed in the second annular groove 18 of the end cover 10, thus reducing the thickness of the end cover assembly 100.

[0114] Along the Z-axis, the upper surface 211 of the lower plastic 20 is connected to the second surface 112 of the end cap 10. A first mounting protrusion 22 of the lower plastic 20 is accommodated in a first mounting groove 12 of the end cap 10, with its first protruding surface 221 abutting against the bottom wall of the groove 12. Simultaneously, a second mounting protrusion 23 is accommodated in a second mounting groove 13 of the end cap 10, with its second protruding surface 231 abutting against the bottom wall of the groove 13, thus achieving a limiting and fixing of the lower plastic 20 on the end cap 10. Each limiting post 26 of the lower plastic 20 is accommodated in a limiting groove 19 of the end cap 10, further limiting and fixing the lower plastic 20 to the end cap 10. Along the Z-axis, a first through hole 24 of the lower plastic 20 and a first through hole 1 of the end cap 10 are coaxially arranged and connected. A second through hole 25 and a second through hole 2 are coaxially arranged and connected.

[0115] The first pole post 30 abuts against the first upper plastic 50 to the end cap 10, and achieves insulation and sealing between the first upper plastic 50 and the end cap 10. The first extension 53 of the first upper plastic 50 passes through the first through hole 1 of the end cap 10. The first body 31 of the first pole post 30 passes through the first insulating hole 54 of the first upper plastic 50. Along the axial direction of the first through hole 1, the first body section 51 of the first upper plastic 50 is located between the first flange 32 and the first inclined boss 14. The first upper surface 511 of the first body section 51 abuts against the first bottom surface 322 of the first flange 32. The first lower surface 512 of the first body section 51 abuts against the first boss surface 141 of the first inclined boss 14. Along the axis away from the first through hole 1, the first protruding section 52 of the first upper plastic 50 protrudes beyond the outer periphery of the first flange 32 to increase the creepage distance between the first electrode post 30 and the end cover 10, ensuring the insulation performance between the first electrode post 30 and the end cover 10 and improving the safety of the energy storage device 1000. Furthermore, since the width of the first upper arc surface 521 is greater than the width of the first lower arc surface 522, the first upper plastic 50 can further increase the creepage distance between the first electrode post 30 and the end cover 10.

[0116] The first upper arc surface 521 of the first protruding section 52 forms an angle with the first surface 111 of the end cap 10, creating a slope. This facilitates the electrolyte splashed onto the first upper plastic 50 to slide down to the first surface 111 of the end cap 10, preventing the electrolyte from accumulating on the first upper plastic 50 and ensuring its performance. The first lower arc surface 522 of the first protruding section 52 faces the end cap 10 and forms a "<" shaped annular notch with the first inclined circumferential surface 142 of the first inclined boss 14. The notch faces away from the first electrode post 30. This allows for a large exposed area between the end cap 10 and the first upper plastic 50, which is beneficial for wiping away electrolyte dripped between the end cap 10 and the first upper plastic 50.

[0117] Furthermore, the inventors discovered that when electrolyte seeps into the energy storage device 1000 from the outside through the assembly gap between the first upper plastic 50 and the end cap 10, and remains there for a long time, the electrolyte will corrode the first sealing ring 71 inside the end cap assembly 100, causing seal failure. Simultaneously, the residual electrolyte is prone to forming white crystals due to oxidation or drying, which not only disrupts the uniformity of force on the inner side of the first sealing ring 71, causing seal failure, but also remains in the assembly gap between the end cap 10 and the first upper plastic 50, affecting the appearance of the energy storage device 1000. In this embodiment, along the axis away from the first through hole 1, the first protruding section 52 protrudes from the outer periphery of the first inclined boss 14 of the end cover 10. Therefore, electrolyte sliding off the first upper plastic 50 will not seep into the interior of the energy storage device 1000 from the assembly gap between the first upper plastic 50 and the end cover 10, preventing the electrolyte from affecting the first sealing ring 71 and ensuring the sealing performance of the first sealing ring 71. At the same time, the first protruding section 52 can block the assembly gap between the end cover 10 and the first upper plastic 50, thereby blocking the white crystals formed at the assembly gap between the end cover 10 and the first upper plastic 50, reducing the defect rate of the appearance of the energy storage device 1000.

[0118] It should be noted that the assembly gaps between the first body section 51 and the first flange 32 of the first upper plastic 50, as well as the assembly gap between the first body section 51 and the end cap 10, are all located in the direction away from the axis of the first protruding section 52 from the first through hole 1. The first body section 51 and the first flange 32 both extend parallel to the end cap 10, that is, the first upper surface 511 of the first body section 51 is parallel to the first bottom surface 322 of the first flange 32. During the manufacturing process of the energy storage device 1000, this avoids the electrolyte dripping onto the end cap 10 from splashing onto the first electrode post 30 and flowing into the aforementioned assembly gaps, further reducing the appearance defect rate of the energy storage device 1000. At the same time, it also avoids the risk of welding explosions caused by residual electrolyte in the aforementioned assembly gaps when welding the first connector 300 and the first electrode post 30.

[0119] The first sealing ring 71 is sleeved on the outer periphery of the first body 31 and accommodated in the first assembly groove 12. The first sealing ring 71 includes a first sealing hole 711, which extends through both sides of the first sealing ring 71 in the thickness direction.

[0120] The first pressure block 80 is fitted onto the outer periphery of the first body 31 and presses against the first sealing ring 71, causing the first sealing ring 71 to deform and press against the surrounding components, thereby improving the sealing performance of the end cap assembly 100. The surface of the first pressure block 80 facing the first sealing ring 71 abuts against the first step surface 331 of the first step 33. The first pressure block 80 includes a first connecting hole 801, which extends through both sides of the first pressure block 80 in the thickness direction. The first pressure block 80 is connected to the first pole post 30 by welding and is electrically conductive, and the first pressure block 80 is insulated from the end cap 10 by the first sealing ring 71 and the lower plastic 20.

[0121] It is understood that the first insulating hole 54 of the first upper plastic 50, the first through hole 1 of the end cap 10, the first through hole 24 of the lower plastic 20, the first sealing hole 711 of the first sealing ring 71, and the first connecting hole 801 of the first pressure block 80 are coaxially arranged, and the first body 31 of the first pole post 30 is sequentially inserted through the first insulating hole 54, the first through hole 1, the first through hole 24, the first sealing hole 711, and the first connecting hole 801.

[0122] The second pole post 40 abuts against the second upper plastic 60 to the end cap 10, and achieves insulation and sealing between the two through the second upper plastic 60 and the end cap 10. The second extension 63 of the second upper plastic 60 passes through the second through hole 2 of the end cap 10. The second body 41 of the second pole post 40 passes through the second insulating hole 64 of the second upper plastic 60. Along the axial direction of the second through hole 2, the second body section 61 of the second upper plastic 60 is located between the second flange 42 and the second inclined boss 15. The second upper surface 611 of the second body section 61 abuts against the second bottom surface 422 of the second flange 42. The second lower surface 612 of the second body section 61 abuts against the second boss surface 151 of the second inclined boss 15. Along the axis away from the second through hole 2, the second protruding section 62 of the second upper plastic 60 protrudes beyond the outer periphery of the second flange 42 to increase the creepage distance between the second pole post 40 and the end cover 10, ensuring the insulation performance between the second pole post 40 and the end cover 10 and improving the safety of the energy storage device 1000. Furthermore, since the width of the second upper arc surface 621 is greater than the width of the second lower arc surface 622, the second upper plastic 60 can further increase the creepage distance between the second pole post 40 and the end cover 10.

[0123] The second upper arc surface 621 of the second protruding section 62 is set at an angle to the first surface 111 of the end cap 10, forming a slope. This facilitates the electrolyte splashed onto the second upper plastic 60 to slide down to the first surface 111 of the end cap 10, preventing the electrolyte from accumulating on the second upper plastic 60 and ensuring its performance. The second lower arc surface 622 of the second protruding section 62 faces the end cap 10 and forms a "<" shaped annular notch with the second inclined circumferential surface 152 of the second inclined boss 15. The notch faces away from the second pole post 40. It can be understood that the large exposed area of ​​the assembly gap between the end cap 10 and the second upper plastic 60 is beneficial for wiping away the electrolyte dripped between the end cap 10 and the second upper plastic 60.

[0124] Furthermore, the inventors discovered that when electrolyte seeps into the energy storage device 1000 from the outside through the assembly gap between the end cap 10 and the second upper plastic 60, and remains there for a long time, the electrolyte will corrode the second sealing ring 72 inside the end cap assembly 100, causing seal failure. Simultaneously, the residual electrolyte is prone to forming white crystals due to oxidation or drying, which not only disrupts the uniformity of force on the inner side of the second sealing ring 72, causing seal failure, but also remains in the assembly gap between the end cap 10 and the second upper plastic 60, affecting the appearance of the energy storage device 1000. In this embodiment, along the axis away from the second through hole 2, the second protruding section 62 protrudes from the outer periphery of the second inclined boss 15 of the end cap 10. Therefore, electrolyte sliding off the second upper plastic 60 will not seep into the energy storage device 1000 through the assembly gap between the second upper plastic 60 and the end cap 10, preventing the electrolyte from affecting the second sealing ring 72 and ensuring the sealing performance of the second sealing ring 72. At the same time, the second protruding section 62 can block the assembly gap between the end cap 10 and the second upper plastic 60, thereby blocking the white crystals formed at the assembly gap between the end cap 10 and the second upper plastic 60, reducing the defect rate of the appearance of the energy storage device 1000.

[0125] It should be noted that the assembly gaps of the second body section 61 and the second flange 42 of the second upper plastic 60, as well as the assembly gap between the second body section 61 and the end cap 10, are all located in the direction away from the axis of the second protruding section 62 from the second through hole 2. The second body section 61 and the second flange 42 both extend parallel to the end cap 10, that is, the second upper surface 611 of the second body section 61 is parallel to the second bottom surface 422 of the second flange 42. During the manufacturing process of the energy storage device 1000, this avoids the electrolyte dripping onto the end cap 10 from splashing onto the second electrode post 40 and flowing into the aforementioned assembly gaps, further reducing the appearance defect rate of the energy storage device 1000. It also avoids the risk of welding explosions caused by residual electrolyte in the aforementioned assembly gaps when welding the second connector 400 and the second electrode post 40.

[0126] The second sealing ring 72 is sleeved on the outer periphery of the second body 41 and accommodated within the second assembly groove 13. The second sealing ring 72 includes a second sealing hole 721, which extends through both sides of the second sealing ring 72 in the thickness direction.

[0127] The second pressure block 81 is fitted onto the outer periphery of the second body 41 and presses against the second sealing ring 72, causing the second sealing ring 72 to deform and fit with surrounding components, thereby improving the sealing performance of the end cap assembly 100. The surface of the second pressure block 81 facing the second sealing ring 72 abuts against the second step surface 431 of the second step 43. The second pressure block 81 includes a second connecting hole 811, which extends through both sides of the second pressure block 81 in the thickness direction. The second pressure block 81 is connected to the second pole post 40 by welding and is electrically conductive, and the second pressure block 81 is insulated from the end cap 10 by the second sealing ring 72 and the lower plastic 20.

[0128] It is understood that the second insulating hole 64 of the second upper plastic 60, the second through hole 2 of the end cap 10, the second through hole 25 of the lower plastic 20, the second sealing hole 721 of the second sealing ring 72, and the second connecting hole 811 of the second pressure block 81 are coaxially arranged, and the second body 41 of the second pole post 40 is sequentially inserted through the second insulating hole 64, the second through hole 2, the second through hole 25, the second sealing hole 721, and the second connecting hole 811.

[0129] Please refer to the following: Figure 3 , Figure 8 and Figure 9 , Figure 9 for Figure 2 The diagram shows a cross-sectional view of the energy storage device along line MM. It should be noted that... Figure 9 The outer wrapping and protective components are not shown in the text, and Figure 9 for Figure 8 The diagram shows the structural arrangement of the end cap assembly with the remaining components.

[0130] Electrode assembly 900, first connector 300, second connector 400, end cap assembly 100, insulating film 500 and support 600 are mounted together in housing 200, and outer film 700 is wrapped around and at the bottom of housing 200 to form energy storage device 1000.

[0131] Among them, such as Figure 9As shown, the electrode assembly 900 is housed within the receiving cavity 202 of the housing 200. The end cap assembly 100 is located at the end of the electrode assembly 900 facing the opening 201. The lower surface 212 of the lower plastic 20 abuts against the upper end face 921 of the cell 910 in the electrode assembly 900. The first connector 300 and the second connector 400 are both located between the lower plastic 20 and the electrode assembly 900, and are spaced apart from the lower plastic 20. The first connector 300 connects the two first tabs 930 of the electrode assembly 900 and the first terminal post 30 of the end cap assembly 100 to electrically connect the electrode assembly 900 and the first terminal post 30. The second connector 400 connects the two second tabs 940 of the electrode assembly 900 and the second terminal post 40 of the end cap assembly 100 to electrically connect the electrode assembly 900 and the second terminal post 40.

[0132] Along the Z-axis, the first bent portion 380 of the first connector 300 extends away from the first tab 930. The first transition portion 370 of the first connector 300 is spaced apart from the first tab 930 to prevent the heat generated by the first connector 300 during current overcurrent from being transferred to the cell body 920 and affecting the performance of the cell body 920.

[0133] The first protrusion 374 of the first connector 300 passes through the first pole post through hole 34 of the first pole post 30, and the first protrusion 374 is welded to the first pole post 30 by seam welding and is electrically connected.

[0134] In this embodiment, both the first convex bulge 374 and the first electrode through-hole 34 are elliptical. When the first convex bulge 374 passes through the first electrode through-hole 34, the circumference of the elliptical first convex bulge 374 is longer than that of the circular first convex bulge 374. Therefore, the contact area between the first convex bulge 374 and the first electrode through-hole 34 is larger. After the first convex bulge 374 and the first electrode 30 are welded and electrically connected, the current carrying capacity of the first connector 300 and the first electrode 30 increases, thereby improving the energy efficiency of the energy storage device 1000. At the same time, the elliptical first convex bulge 374 and the elliptical first electrode through-hole 34 cooperate to improve the torsional strength when the first electrode 30 and the first connector 300 are connected, ensuring the stability of the energy storage device 1000 during the manufacturing process.

[0135] Furthermore, along the Z-axis, the first top surface 375 of the first protrusion 374 is flush with the bottom wall of the first sinker 35 to prevent the weld seam generated during the welding of the first protrusion 374 and the first pole post 30 from protruding from the first top surface 321 of the first flange 32, thus preventing incomplete welding between the first protrusion 374 and the first pole post 30. It can be understood that the first sinker 35 on the first pole post 30 not only reduces the height required for welding the first protrusion 374 and the first pole post 30, thereby reducing the manufacturing difficulty and cost of the first connector 300, but also accommodates the weld seam within the first sinker 35, improving the appearance of the energy storage device 1000.

[0136] The first adapter portion 370 of the first connector 300 is spaced apart from the first main body 31 of the first electrode post 30. Specifically, the outer surface 371 of the first adapter portion 370 is spaced apart from the first end face 311 of the first main body 31, with a gap L greater than or equal to 0.1 mm and less than or equal to 2 mm, preferably 0.5 mm. It is understood that the spaced-apart arrangement of the first adapter portion 370 and the first electrode post 30 reduces the risk of assembly failure of the electrode assembly 900 and the end cap assembly 100 due to process errors in the energy storage device 1000.

[0137] Along the Z-axis, the second bend 480 of the second connector 400 extends away from the two second tabs 940. The second adapter 470 of the second connector 400 is spaced apart from the second tabs 940 to prevent the heat generated by the second connector 400 during current overcurrent from being transferred to the cell body 920 and affecting the performance of the cell body 920.

[0138] The second protrusion 474 of the second connector 400 passes through the second pole post through hole 44 of the second pole post 40, and the second protrusion 474 is welded to the second pole post 40 by a seam weld and is electrically connected. In this embodiment, the shape of the second protrusion 474 and the shape of the second pole post through hole 44 are both elliptical. When the second protrusion 474 passes through the second pole post through hole 44, the circumference of the elliptical second protrusion 474 is longer than that of the circular second protrusion 474. Therefore, the contact area between the second protrusion 474 and the second pole post through hole 44 is larger. After the second protrusion 474 and the second pole post 40 are welded and electrically connected, the current carrying capacity of the second connector 400 and the second pole post 40 increases, thereby improving the energy efficiency of the energy storage device 1000. Meanwhile, the elliptical second convex 474 cooperates with the elliptical second pole post through hole 44, which can improve the torsional strength when the second pole post 40 and the second connector 400 are connected, ensuring the stability of the energy storage device 1000 during the manufacturing process.

[0139] Furthermore, along the Z-axis, the second top surface 475 of the second protrusion 474 is flush with the bottom wall of the second recess 45 to prevent the weld seam generated during the welding of the second protrusion 474 and the second pole post 40 from protruding from the second top surface 421 of the second flange 42, thus preventing incomplete welding between the second protrusion 474 and the second pole post 40. It can be understood that the second recess 45 provided with the second pole post 40 not only reduces the height required for welding the second protrusion 474 and the second pole post 40, thereby reducing the manufacturing difficulty and cost of the second connector 400, but also accommodates the weld seam within the second recess 45, improving the appearance of the energy storage device 1000.

[0140] The second adapter portion 470 of the second connector 400 is spaced apart from the second main body 41 of the second pole post 40. Specifically, the outer surface 471 of the second adapter portion 470 is spaced apart from the second end face 411 of the second main body 41, with a gap K greater than or equal to 0.1 mm and less than or equal to 2 mm, preferably 0.5 mm. It is understood that the second adapter portion 470 and the second pole post 40 are spaced apart to reduce the risk of assembly failure of the electrode assembly 900 and the end cap assembly 100 due to process errors in the energy storage device 1000.

[0141] The insulating film 500 can be made of at least one material selected from, but is not limited to, Mylar, polyethylene (PE), polypropylene (PP), polyester, etc. This application embodiment does not limit this. The insulating film 500 wraps around and around the bottom of the electrode assembly 900 and is attached to the edge of the lower plastic 20 to separate and insulate the electrode assembly 900 from the housing 200, preventing short circuits in the electrode assembly 900.

[0142] Along the Z-axis, the support member 600 is mounted on the end of the electrode assembly 900 facing away from the end cap assembly 100, and is separated from the electrode assembly 900 by the insulating film 500. The support member 600 supports the electrode assembly 900 to prevent the electrode assembly 900 from separating from the end cap 10 due to gravity, thus ensuring the stability of the first tab 930 and the first connector 300, as well as the stability of the second tab 940 and the second connector 400.

[0143] Since the outer casing 200 is made of metal, an outer film 700 is wrapped around its perimeter and bottom. The outer film 700 is made of insulating material to isolate and insulate the outer casing 200 from the external environment. At the same time, the outer film 700 also protects the appearance of the outer casing 200 to prevent scratches from affecting its use.

[0144] In addition, the outer film 700 also covers the edge of the first surface 111 of the end cap 10, which not only ensures the adhesion stability of the outer film 700 to the housing 200, but also covers the weld seam between the housing 200 and the end cap 10, improving the appearance of the energy storage device 1000.

[0145] Along the Z-axis, the protective element 800 is attached to the first surface 111 of the end cap 10 and completely covers the outer film 700 connected to the edge of the end cap 10 to protect the appearance of the end cap 10.

[0146] In addition, the protective element 800 is made of insulating material to isolate and insulate the end cap 10 from the external environment.

[0147] Please refer to the following: Figure 10 and Figure 11 , Figure 10 for Figure 3 The diagram shows a second embodiment of the end cap assembly in the energy storage device. Figure 11 for Figure 10 The diagram shows the end cap assembly from another angle.

[0148] With the above Figure 5 , Figure 6 and Figure 7 The end cap assembly 100 shown differs from the first embodiment in that the structures of the end cap 10 and the lower plastic 20 in this embodiment are different from those in the first embodiment. In this embodiment, the end cap 10 further includes a reinforcing protrusion 114 and a plurality of reinforcing recesses 115. The reinforcing protrusion 114 is disposed around the periphery of the protective sheet 93. The reinforcing protrusion 114 is used to increase the rigidity of the end cap 10. The plurality of reinforcing recesses 115 are arranged side-by-side along the length direction of the end cap 10 and spaced apart along the width direction of the end cap 10. The plurality of reinforcing recesses 115 are respectively located on both sides of the protective sheet 93 along the width direction of the end cap 10. The plurality of reinforcing recesses 115 are all elongated structures. The extending direction of the plurality of reinforcing recesses 115 is consistent with the length direction of the end cap 10. The length of the plurality of reinforcing recesses 115 is greater than the width of the protective sheet 93. The reinforcing recesses 115 are used to further increase the rigidity of the end cap 10. Exemplarily, the number of reinforcing recesses 115 is four. Two reinforcing recesses 115 are located on one side of the reinforcing protrusion 114 in the width direction, and the other two reinforcing recesses 115 are located on the other side of the reinforcing protrusion 114 in the width direction.

[0149] Combination Figure 11 , Figure 12 and Figure 13 , Figure 12 for Figure 10 The diagram shown is an exploded view of the end cap assembly. Figure 13 for Figure 11The diagram shows an exploded view of the end cap assembly. In this embodiment, the lower plastic 20 also includes multiple clearance portions 27. Each clearance portion 27 is recessed into the upper surface 211 of the lower plastic 20 and recessed towards the lower surface 212. Along the Z-axis, the clearance portions 27 correspond to the reinforcing recesses 115. The clearance portions 27 are arranged side-by-side along the length of the lower plastic 20 and spaced apart along the width of the lower plastic 20. The extending direction of the clearance portions 27 is consistent with the length direction of the lower plastic 20. Each clearance portion 27 is a strip-shaped structure. Each clearance portion 27 crosses the explosion-proof fence 91 and communicates with the explosion-proof fence 91.

[0150] Combination Figure 14 and Figure 15 , Figure 14 for Figure 12 The diagram shows a cross-sectional view of the end cap in the end cap assembly. Figure 15 for Figure 14 The diagram shows another cross-sectional view of the end cap.

[0151] In this embodiment, the thickness D of the end cap body 11 is reduced to greater than or equal to 1.5 mm and less than or equal to 1.8 mm. The end cap 10 also includes a recessed portion 113. The recessed portion 113 is recessed in the second surface 112 of the end cap body 11, and the recessed portion 113 is recessed from the second surface 112 toward the first surface 111 to form a reinforcing protrusion 114. The reinforcing protrusion 114 protrudes from the first surface 111. The reinforcing protrusion 114 is formed by stamping the end cap 10 from the second surface 112 side toward the first surface 111 side. The pressure relief hole 16 of the end cap 10 passes through both sides of the reinforcing protrusion 114 and the recessed portion 113 in the thickness direction. The first annular groove 17 is recessed in the reinforcing protrusion 114, and the second annular groove 18 is located in the recessed portion 113. It can be understood that the reinforcing protrusion 114 is arranged around the periphery of the first annular groove 17, and the recessed portion 113 is arranged around the periphery of the second annular groove 18. In this embodiment, there is one concave portion 113 and one reinforcing protrusion 114. Both the concave portion 113 and the reinforcing protrusion 114 are elliptical in shape. Along the Z-axis, the thickness S of the reinforcing protrusion 114 (i.e., the straight-line distance between the two opposing surfaces of the reinforcing protrusion 114 and the concave portion 113) is equal to the thickness D of the end cap body 11, or the thickness S of the reinforcing protrusion 114 is greater than or equal to 80% of the thickness D of the end cap body 11 and less than or equal to 99% of the thickness D of the end cap body 11.

[0152] Multiple reinforcing recesses 115 of the end cap 10 are recessed into the first surface 111 of the end cap 10, and the multiple reinforcing recesses 115 are recessed toward the second surface 112, and protrude from the second surface 112 to form inner protrusions 116. For example, the number of inner protrusions 116 is the same as the number of reinforcing recesses 115, and there are four inner protrusions 116, each inner protrusion 116 corresponding to one reinforcing recess 115.

[0153] See you again Figure 12 and Figure 13 An explosion-proof valve plate 92 and a protective plate 93 are mounted on the end cap 10. A reinforcing protrusion 114 surrounds the periphery of the protective plate 93, and a recessed portion 113 surrounds the periphery of the explosion-proof valve plate 92, improving the stability of the explosion-proof valve plate 92 and the protective plate 93 when ruptured by the gas inside the energy storage device 1000. Furthermore, a reinforcing recess 115 is located on the outside of the explosion-proof valve plate 92 and the protective plate 93, further enhancing their stability when ruptured by the gas inside the energy storage device 1000. The end cap 10 and the lower plastic 20 are stacked along the Z-axis, with the recessed portion 113 of the end cap 10 opposite to the explosion-proof barrier 91. The length of the reinforcing recess 115 of the end cap 10 is greater than the width of the explosion-proof barrier 91. Each inner protrusion 116 of the end cap 10 is accommodated in a relief portion 27, which reduces the space occupied by the end cap assembly 100 in the height direction of the energy storage device 1000, and is beneficial to improving the energy density of the energy storage device 1000.

[0154] It should be noted that the contents that are the same as those in the first embodiment of the end cap assembly 100 described above will not be repeated here. Furthermore, the assembly relationship between the end cap assembly 100 and other structural components in the energy storage device 1000 in this embodiment is the same as that in the first embodiment described above, and therefore will not be repeated here.

[0155] 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, include: An end cap includes an end cap body, the end cap body including a first surface, a second surface and an inclined boss, the first surface and the second surface being disposed opposite to each other along the thickness direction of the end cap body, the inclined boss protruding from the first surface of the end cap body, the inclined boss including an inclined peripheral surface and a boss surface, the inclined peripheral surface connecting the boss surface and the first surface and surrounding the periphery of the boss surface, the end cap body also including a through hole penetrating the second surface and the boss surface; The upper plastic includes a body segment, an extension segment, and a protruding segment. The body segment is connected to the outer periphery of the extension segment. The extension segment extends along the height direction of the upper plastic and the extension direction of the body segment intersects with the extension direction of the extension segment. The extension segment forms an insulating hole. The protruding segment extends from the outer periphery of the body segment away from the extension segment and the extension direction is the same as the extension direction of the body segment. An electrode post, comprising a flange and a body, wherein the flange comprises a top surface and a bottom surface, the top surface and the bottom surface being disposed opposite to each other along the thickness direction of the flange, and the body protruding from the bottom surface and extending away from the flange; The upper plastic and the pole are mounted on the end cap, the extension section passes through the through hole, and the main body passes through the insulating hole and the through hole in sequence. Along the axial direction of the through hole, the main body section is located between the bottom surface of the flange and the inclined boss of the end cap body. Along the axial direction of the protruding section away from the through hole, one end of the protruding section away from the through hole protrudes from the inclined circumferential surface and the outer periphery of the flange, and the protruding section is spaced apart from the first surface of the end cap body.

2. The end cap assembly according to claim 1, characterized in that, The protruding section includes an upper arc surface, which faces away from the end cap, and the upper arc surface is set at an angle to the first surface of the end cap.

3. The end cap assembly according to claim 2, characterized in that, The protruding section also includes a lower arc surface, which is arranged opposite to the upper arc surface along the thickness direction of the protruding section. The lower arc surface and the oblique circumferential surface form a "<" shaped annular notch, which surrounds and faces away from the pole post.

4. The end cap assembly according to claim 3, characterized in that, The body segment includes an upper part and a lower part, which are arranged opposite to each other along the thickness direction of the body segment. The upper part is opposite to and connected to the bottom surface, and both the upper part and the bottom surface are parallel to the first surface. The lower part is opposite to and connected to the boss surface, and both the lower part and the boss surface are parallel to the first surface. The width of the upper surface is less than the width of the lower surface, the width of the upper arc surface is greater than the width of the lower arc surface, and the angle of inclination of the upper arc surface relative to the upper surface is less than the angle of inclination of the lower arc surface relative to the lower surface.

5. The end cap assembly according to claim 1, characterized in that, The end cap assembly also includes an explosion-proof valve. The end cap also includes a recess and a reinforcing protrusion. The recess is formed by the second surface being recessed in the direction towards the first surface, and the reinforcing protrusion is formed on the first surface, with the reinforcing protrusion protruding from the first surface. The end cap also includes a pressure relief hole. Along the thickness direction of the end cap, the pressure relief hole penetrates the reinforcing protrusion. Part of the explosion-proof valve is disposed on the end cap and covers the pressure relief hole.

6. The end cap assembly according to claim 5, characterized in that, The end cap assembly also includes a lower plastic layer, and the lower plastic layer and the end cap are stacked together along the thickness direction of the end cap assembly; The end cap further includes a first annular groove and a second annular groove. The second annular groove is located inside the recessed portion, and the first annular groove is recessed in the reinforcing protrusion. Both the first annular groove and the second annular groove are arranged around the periphery of the pressure relief hole and are connected to the hole wall of the pressure relief hole. The explosion-proof valve includes an explosion-proof valve plate, a protective plate, and an explosion-proof barrier. The explosion-proof valve plate is housed in the second annular groove, and the protective plate is housed in the first annular groove. The protective plate and the explosion-proof valve plate are opposite to and spaced apart along the thickness direction of the end cap assembly. The explosion-proof barrier is disposed on the lower plastic, and the explosion-proof valve plate is located inside the explosion-proof barrier.

7. The end cap assembly according to claim 6, characterized in that, The end cap further includes multiple reinforcing recesses and multiple inner protrusions. Each reinforcing recess is recessed in the first surface and recessed in the direction of the second surface to form an inner protrusion. Multiple inner protrusions are protruding in the second surface. Multiple reinforcing recesses are arranged side by side along the length direction of the end cap and spaced apart along the width direction of the end cap. Multiple reinforcing recesses are respectively located on both sides of the protective sheet along the width direction of the end cap. The reinforcing recess extends in the same direction as the length of the end cap, and the length of the reinforcing recess is greater than the width of the protective sheet.

8. The end cap assembly according to claim 7, characterized in that, The lower plastic also includes a plurality of clearance portions, which are recessed on the first surface and recessed into the second surface. The plurality of clearance portions are arranged side by side along the length direction of the lower plastic and spaced apart along the width direction of the lower plastic. The plurality of clearance portions all cross the explosion-proof fence and are connected to the explosion-proof fence. Each inner convex part is contained within one clearance portion.

9. The end cap assembly according to any one of claims 1-8, characterized in that, The flange is an elliptical block, the main body is an elliptical cylinder, and the through hole is an elliptical hole.

10. An energy storage device, characterized in that, Including the end cap assembly as described in any one of claims 1-9, further comprising: The outer casing, including the opening; An electrode assembly includes a battery cell, the battery cell comprising a cell body and tabs, the cell body including an upper end face and a lower end face, the upper end face and the lower end face being disposed opposite to each other along the height direction of the cell body, and the tabs extending out of the upper end face; and Connectors; The end cap assembly is mounted on the end of the electrode assembly facing the opening and seals the opening. The connector is located between the electrode assembly and the end cap assembly, and the connector connects and conducts electricity between the electrode post and the electrode tab.

11. An electrical appliance, characterized in that, Includes the energy storage device as described in claim 10, wherein the energy storage device is used to supply power to the electrical equipment.

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