End cap assemblies, energy storage devices and electrical equipment

Abstract

This application provides an end cap assembly, an energy storage device, and an electrical appliance. The end cap assembly includes an insulating member and an adapter. The insulating member includes a first surface and a second surface facing away from each other. A receiving groove is formed in the insulating member, recessed from the first surface toward the second surface. A positioning member is provided on the side wall of the receiving groove, protruding from the side wall of the receiving groove. The adapter includes a connected disc portion and an extension portion. The extension portion is installed in the receiving groove and includes a bending area. Along the extension direction of the extension portion, the bending area is located between the positioning member and the disc portion. The bending area bends along the positioning member so that the disc portion approaches the extension portion, the positioning member, and the insulating member. In this application, when the extension portion is installed in the receiving groove and bent, the bending area is located between the disc portion and the positioning member. The bending area can abut against the positioning member for bending, simplifying the bending process and improving the consistency of the adapter's bending, thus improving the consistency of mass production.

Description

Technical Field

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

[0002] Energy storage devices, such as secondary batteries, also known as rechargeable batteries or accumulators, are batteries that can be recharged after discharge to reactivate the active materials and continue to be used. The recyclable nature of secondary batteries has gradually made them a major power source for electrical equipment. As the demand for secondary batteries increases, people's requirements for their performance in various aspects are also becoming more stringent, especially regarding cycle performance and safety. Energy density is a crucial parameter for ensuring battery cycle performance; excessively low energy density per unit volume leads to low battery capacity and poor cycle performance.

[0003] Secondary batteries, such as cylindrical lithium-ion batteries, consist of end cap assemblies, electrode assemblies, and a cylindrical casing. During secondary battery production, the end cap assemblies, electrode assemblies, and cylindrical casing are fabricated separately. Then, metal adapters are used to weld the terminals of the end cap assemblies and the tabs of the electrode assemblies. However, when welding the metal adapters to the terminals and tabs, the metal adapters need to be bent. Poor consistency in the bending positions of these metal adapters leads to inconsistent production of secondary batteries in batches. Summary of the Invention

[0004] This application provides an end cap assembly with high bending consistency of the adapter, an energy storage device, and an electrical device.

[0005] In a first aspect, embodiments of this application provide an end cap assembly. The end cap assembly includes an insulating member and an adapter. The insulating member includes a first surface and a second surface facing away from each other. The insulating member has a receiving groove formed therein, recessed from the first surface toward the second surface. A positioning member is provided on the sidewall of the receiving groove, protruding from the sidewall of the receiving groove. The adapter includes a connected disc portion and an extension portion. The extension portion is mounted in the receiving groove and includes a bending region located between the positioning member and the disc portion along its extending direction. The bending region bends along the positioning member to bring the disc portion closer to the extension portion, the positioning member, and the insulating member.

[0006] In the end cap assembly of this application, a positioning member is provided on the side wall of the receiving groove. The extension of the adapter is installed in the receiving groove. When the adapter is bent, the extension abuts against the side of the positioning member near the disc body and is limited, so that the bending area is limited between the positioning member and the disc body. When the adapter is bent to the bending area abutting the positioning member, the extension is limited in the receiving groove by the positioning member. Under the pulling force of the extension, when the adapter is bent to the bending area abutting the positioning member, the bending area can bend against the side of the positioning member near the disc body under the limitation of the positioning member and the pulling force of the extension, so that the disc body approaches the extension, the positioning member and the insulating member, thereby making the disc body cover the receiving groove and the extension and positioning member in the receiving groove, and making the disc body face the insulating member. The positioning element makes the bending process simpler. Since the positioning element is fixed in the receiving groove, the bending area is always located between the positioning element and the disk body after the extension is installed in the receiving groove, which can improve the consistency of mass production of energy storage devices.

[0007] In one possible implementation, the positioning element is provided on two opposite sidewalls of the receiving groove along the width direction, and the distance between the two positioning elements along the width direction of the receiving groove is less than the width of the bending area.

[0008] It can be seen that positioning elements are provided on both sidewalls of the receiving groove along the width direction. When the bending area bends along the two positioning elements, the force is evenly distributed, improving the consistency of bending. Furthermore, the distance between the two positioning elements along the width direction is less than the width of the bending area. When bending the adapter, both sides of the bending area (both sides along the width direction) abut against the sides of the positioning elements, i.e., the sides of the positioning elements closest to the disk body. This ensures that the forces on both sides of the bending area are balanced, guaranteeing that the bent disk body is aligned with the insulating element in the height direction. This prevents the projection of the adapter from deviating from the projection of the insulating element, which could cause short-circuit contact between the adapter and the shell, affecting the cycle performance of the energy storage device.

[0009] In one possible implementation, the ratio of the distance between the two positioning members to the width of the bending area along the width direction of the receiving groove is greater than or equal to 0.67 and less than or equal to 0.80.

[0010] It can be seen that, along the width direction of the receiving groove, under the premise that the width of the bending area is constant, if the distance between the two positioning parts and the width of the bending area is less than 0.67, the spacing between the two positioning parts is too narrow, and it will be more difficult to squeeze the extension towards the receiving groove for installation, resulting in low installation efficiency. Along the width direction of the receiving groove, under the premise that the width of the bending area is constant, if the distance between the two positioning parts and the width of the bending area is greater than 0.80, the spacing between the two positioning parts is too wide. When the adapter bends to the bending area to abut the positioning part, the bending area will abut against the edge of the positioning part away from the receiving groove. The bending area is easy to be squeezed into the receiving groove along the edge of the positioning part, resulting in low installation efficiency. Along the width of the receiving groove, the ratio of the distance between the two positioning members to the width of the bending area is greater than or equal to 0.67 and less than or equal to 0.80. This avoids the spacing between the two positioning members being too narrow or too wide, making it easier to squeeze the extension into the receiving groove, and ensuring that the bending area does not bend along the edge of the positioning member away from the side wall of the receiving groove, thus improving installation efficiency.

[0011] In one possible implementation, a gap is formed between the positioning member and the bottom wall of the receiving groove along the height direction of the receiving groove, and the height of the gap is greater than the thickness of the extension.

[0012] It can be seen that when the extension of the adapter is installed in the receiving groove, the height of the gap between the positioning member and the bottom wall of the receiving groove is greater than the thickness of the extension. This can effectively limit the extension in the receiving groove and prevent the connection between the end of the extension and the pole post from being affected by the pulling force on the extension when the adapter is bent.

[0013] In one possible implementation, along the height direction of the receiving groove, the ratio of the height of the gap to the thickness of the extension is greater than or equal to 2.0 and less than or equal to 3.5.

[0014] It can be seen that, along the height direction of the receiving groove, assuming a fixed thickness of the extension, if the ratio of the gap height to the extension thickness is less than 2.0, the gap height is too small. When the extension is squeezed into the receiving groove along the positioning member, the deformation of the positioning member in the direction of the receiving groove will occupy a certain space, and the deformed part of the positioning member in the direction of the receiving groove will interfere with the installation of the extension. Along the height direction of the receiving groove, assuming a fixed thickness of the extension, if the ratio of the gap height to the extension thickness is greater than 3.5, the gap height is too large. When bending along the positioning member in the bending area, bending is more difficult, the bending area is relatively delayed, the area of ​​the adapter after bending increases, the bending effect is poor, and the gap height is too large. When the adapter is bent, the pulling force of the extension affects the welding reliability of the extension and the pole flange. In the height direction of the receiving groove, the ratio of the height of the gap to the thickness of the extension is greater than or equal to 2.0 and less than or equal to 3.5. This avoids the part of the positioning member deforming in the direction of the receiving groove from interfering with the installation of the extension. It also makes it easier to bend the bending area along the positioning member, and avoids the bending of the adapter from affecting the reliability of the welding between the extension and the pole flange due to the pulling force of the extension.

[0015] In one possible implementation, the positioning member includes a first connecting portion and a second connecting portion. One end of the first connecting portion is connected to the side wall of the receiving groove, and the other end of the first connecting portion is connected to one end of the second connecting portion. The other end of the second connecting portion is connected to the side wall of the receiving groove. The first connecting portion is inclined from the side wall of the receiving groove toward the bottom wall of the receiving groove, and the side of the first connecting portion facing away from the bottom wall of the receiving groove is an inclined surface.

[0016] As can be seen, the first connecting part is inclined from the side wall of the receiving groove toward the bottom wall of the receiving groove, so that the first connecting part has a slope. When the adapter and the insulating part are assembled, it is easier to press the extension of the adapter along the slope of the first connecting part toward the bottom wall of the receiving groove, and it is easier for the extension of the adapter to be snapped into the receiving groove.

[0017] In one possible implementation, along the height direction of the receiving groove, there is a gap between the end of the first connecting portion connected to the side wall of the receiving groove and the end of the second connecting portion connected to the side wall of the receiving groove.

[0018] As can be seen, there is a gap between the first connecting part and the second connecting part. When the extension is pressed along the first connecting part into the receiving groove, it is easier to deform, making the installation of the extension part easier. Moreover, the gap between the first connecting part and the second connecting part can distribute the bending points in the bending area into multiple points, reducing the bending angle range of each bending point. This avoids the bending points of the adapter being concentrated in one place in the bending area and the extension part breaking due to excessive bending angle, effectively improving the service life of the energy storage device.

[0019] In one possible implementation, a chamfer is formed at the connection between the first connecting portion and the second connecting portion.

[0020] As can be seen, a chamfer is provided at the connection between the first connecting part and the second connecting part. During the process of pressing the extension part against the bottom wall of the receiving groove to install it into the groove, the positioning element can be prevented from scratching the extension part, thus protecting it. Furthermore, the chamfer design allows for easier installation by applying only a small force when pressing the extension part to the connection between the first and second connecting parts, enabling it to slide along the curve of the chamfer towards the bottom wall of the receiving groove.

[0021] In one possible implementation, when the adapter is in the unfolded state, at least one of the side of the first connecting portion near the disk portion and the side of the second connecting portion near the disk portion along the extending direction of the adapter is arc-shaped.

[0022] It is understandable that, in the unfolded state, with the extension facing the receiving groove, the side of the first connecting part near the disc body is arc-shaped. When the bending area bends to abut against the side of the first connecting part near the disc body, it can prevent the bending area from being scratched at the point of contact with the first connecting part, thus preventing the bending area from breaking. Alternatively, the side of the second connecting part near the disc body is arc-shaped. When the bending area bends to abut against the side of the second connecting part near the disc body, it can prevent the bending area from being scratched at the point of contact with the second connecting part, thus preventing the bending area from breaking. Alternatively, both the side of the first connecting part near the disc body and the side of the second connecting part near the disc body are arc-shaped. When both the side of the first connecting part near the disk and the side of the second connecting part near the disk are arc-shaped, it can be seen that when the extension is installed in the receiving groove and the adapter is bent, firstly, the bending area bends until it abuts against the side of the second connecting part near the disk, thus forming the first bending point of the bending area. When the bending area bends against the first bending point, the side of the second connecting part near the disk is arc-shaped, which effectively prevents the first bending point from scratching the bending area and causing it to break. After the bending area is bent along the first bending point, the adapter is bent further. At this time, the bending area abuts against the side of the first connecting part near the disk, thus forming the second bending point of the bending area. When the bending area bends against the second bending point, the side of the first connecting part near the disk is arc-shaped, which prevents the second bending point from scratching the bending area and causing it to break, thus extending the service life of the adapter and the energy storage device. In addition, the side of the first connecting part near the disk and the side of the second connecting part near the disk are both arc-shaped, which can play a bending buffer role when bending in the bending area, so that the bending area has a certain curvature and avoids excessive bending in the bending area, which would lead to breakage and reduce the service life of the energy storage device.

[0023] In one possible implementation, the positioning member further includes a protrusion, which is disposed on the side of the first connecting portion away from the bottom wall of the receiving groove, and the distance D between the top of the protrusion and the first surface satisfies: 1mm≤D≤4mm.

[0024] It can be seen that the distance D between the top of the convex strip and the first surface is greater than or equal to 1 mm and less than or equal to 4 mm, so that there is a certain gap between the convex strip and the first surface. After the adapter is bent, the disk body can abut against the top wall of the convex strip to support the disk body relative to the first surface by a certain distance, which can prevent the adapter from being bent too much and breaking, and ensure the service life of the energy storage device.

[0025] In one possible implementation, the insulating member further includes a limiting member disposed on the bottom wall of the receiving groove, and the extension is provided with a mating hole corresponding to the limiting member, the limiting member passing through the mating hole.

[0026] It can be seen that a limiting member is set on the bottom wall of the receiving groove, and a mating hole corresponding to the limiting member is set on the extension. When assembling the adapter and the insulating part, the limiting member is passed through the mating hole to limit the extension. This prevents the extension from being pulled by the force when it is bent, which would cause the end of the extension to not correspond to the flange of the pole, and ensures the reliability of the connection between the end of the extension and the flange of the pole.

[0027] Secondly, embodiments of this application also provide an energy storage device. The energy storage device includes a housing, an electrode assembly, and an end cap assembly as described in the first aspect. The housing has an opening, and the electrode assembly is housed within the housing. The end cap assembly further includes an electrode post and an end cap. The electrode post passes through the end cap and an insulating member of the end cap assembly, and is electrically connected to the electrode assembly via a connector of the end cap assembly. The end cap closes to the opening, and the insulating member of the end cap assembly is connected to the end cap, with the insulating member located between the connector and the end cap.

[0028] In the energy storage device of this application, a positioning member is provided on the side wall of the receiving groove of the adapter. The extension of the adapter is installed in the receiving groove. When the adapter is bent, the extension abuts against the side of the positioning member near the disk body and is limited, so that the bending area is limited between the positioning member and the disk body. When the adapter is bent to the bending area abutting the positioning member, the extension is limited in the receiving groove by the positioning member. Under the pulling force of the extension, when the adapter is bent to the bending area abutting the positioning member, the bending area can bend against the side of the positioning member near the disk body under the limiting of the positioning member and the pulling force of the extension, so that the disk body approaches the extension, the positioning member and the insulating member, thereby making the disk body cover the receiving groove and the extension and positioning member in the receiving groove, and making the disk body face the insulating member. The positioning element makes the bending process simpler. Since the positioning element is fixed in the receiving groove, the bending area is always located between the positioning element and the disk body after the extension is installed in the receiving groove, which can improve the consistency of mass production of energy storage devices.

[0029] Thirdly, embodiments of this application also provide an electrical device. The electrical device includes an energy storage device as described in the second aspect, the energy storage device supplying power to the electrical device.

[0030] In the electrical equipment of this application, a positioning member is provided on the side wall of the receiving groove of the adapter. The extension of the adapter is installed in the receiving groove. When the adapter is bent, the extension abuts against the side of the positioning member near the disc body and is limited, so that the bending area is limited between the positioning member and the disc body. When the adapter is bent to the bending area abutting the positioning member, the extension is limited in the receiving groove by the positioning member. Under the pulling force of the extension, when the adapter is bent to the bending area abutting the positioning member, the bending area can bend against the side of the positioning member near the disc body under the limiting of the positioning member and the pulling force of the extension, so that the disc body approaches the extension, the positioning member and the insulating member, thereby making the disc body cover the receiving groove and the extension and positioning member in the receiving groove, and making the disc body face the insulating member. The positioning element makes the bending process simpler. Since the positioning element is fixed in the receiving groove, the bending area is always located between the positioning element and the disk body after the extension is installed in the receiving groove, which can improve the consistency of mass production of energy storage devices. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0032] Figure 1 This is a schematic diagram of a scenario for an energy storage device provided in an embodiment of this application;

[0033] Figure 2 This is a three-dimensional structural diagram of an energy storage device provided in an embodiment of this application;

[0034] Figure 3 This is a three-dimensional structural diagram of an end cap assembly provided in an embodiment of this application;

[0035] Figure 4 This is a three-dimensional structural diagram of an end cap assembly in an unfolded state, provided by an embodiment of this application.

[0036] Figure 5 This is a three-dimensional structural diagram of an end cap assembly in a bent state, provided by an embodiment of this application.

[0037] Figure 6 yes Figure 5 An enlarged schematic diagram of point VI in the end cap assembly shown;

[0038] Figure 7 This is a three-dimensional structural diagram of an insulating element in an end cap assembly provided in an embodiment of this application;

[0039] Figure 8 This is a three-dimensional structural schematic diagram of another insulating component in an end cap assembly provided in an embodiment of this application;

[0040] Figure 9 This is a three-dimensional structural diagram of an end cap assembly in an unfolded state, provided by an embodiment of this application.

[0041] Figure label:

[0042] Length direction X, width direction Y, height direction Z;

[0043] Energy storage device 1000, end cap assembly 100, insulating component 10, first surface 11, first through hole 12, second surface 13, receiving groove 15, side wall 151, bottom wall 153, positioning component 17, first connecting part 171, side of the first connecting part near the disk body 1711, side of the second connecting part near the disk body 1731, second connecting part 173, chamfer 175, gap H, protrusion 177, limiting component 19, adapter component 30, disk body 31, extension part 33, bending area 331, mating hole 333, end cap 50, second through hole 51, pole post 60, housing 200, opening 201, electrode assembly 300;

[0044] Photovoltaic panels 2000;

[0045] 3000A streetlights;

[0046] Home Appliances 3000b. Detailed Implementation

[0047] 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 a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] The following descriptions of the embodiments are based on the accompanying illustrations and are used to illustrate specific embodiments in which this application can be implemented. Directional terms used herein, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying illustrations. Therefore, the use of directional terms is for better and clearer explanation and understanding of this application, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of this application.

[0049] Furthermore, the serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages).

[0050] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form according to future application needs. As we all know, to achieve the grand goal of carbon neutrality, 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. Energy storage involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, the stored energy is converted back into electrical energy and released. Simply put, energy storage is like a large "power bank". When there is sufficient solar and wind power, electrical energy is stored and the stored power is released when needed.

[0051] Taking electrochemical energy storage as an example, this solution provides an energy storage device 1000. The energy storage device 1000 is equipped with a chemical battery. It mainly uses the chemical elements in the chemical battery as the 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 battery. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or transferred to places with a shortage of electricity for use.

[0052] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding energy storage devices include:

[0053] (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.

[0054] (2) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios primarily operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity consumption during peak and off-peak periods, users with energy storage devices typically charge the cabinets / boxes during off-peak hours to reduce costs; during peak hours, they release the stored electricity for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices effectively provides backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0055] This application uses a home energy storage scenario in user-side energy storage as an example for illustration. Figure 1 This is a schematic diagram of an energy storage device 1000 provided for an embodiment of this application. The energy storage device 1000 of this application is not limited to a home energy storage scenario.

[0056] like Figure 1As shown, this application provides a residential energy storage system, which includes a power conversion device (photovoltaic panel 2000), user loads (streetlight 3000a), user loads (household appliances 3000b), and an energy storage device 1000. The energy storage device 1000 is a small energy storage box that can be wall-mounted to an outdoor wall. Specifically, the photovoltaic panel 2000 converts solar energy into electrical energy during periods of low electricity prices. The energy storage device 1000 stores this electrical energy and supplies it to electrical appliances such as streetlight 3000a and household appliances 3000b during peak electricity prices, or provides power during power outages / power interruptions.

[0057] It is understood that the energy storage device 1000 may include, but is not limited to, single cells, battery modules, battery packs, and battery systems. When the energy storage device 1000 is a single cell, it may be a spherical cell.

[0058] Please see Figure 2 This application provides an energy storage device 1000, which includes a housing 200, an electrode assembly 300, and an end cap assembly 100 provided in this application embodiment. The housing 200 has an opening 201, and the electrode assembly 300 is accommodated within the housing 200. The end cap assembly 100 is mounted on one side of the housing 200, and the end cap assembly 100 covers the opening 201 of the housing 200 and is welded to seal it.

[0059] Please combine Figures 2 to 4 The end cap assembly 100 provided in this application embodiment includes an insulating member 10 and an adapter 30. The insulating member 10 includes a first surface 11 and a second surface 13 facing away from each other. The insulating member 10 has a receiving groove 15 formed, which is recessed from the first surface 11 toward the second surface 13. A positioning member 17 is provided on the side wall 151 of the receiving groove 15, and the positioning member 17 protrudes from the side wall 151 of the receiving groove 15. The adapter 30 includes a connected disc portion 31 and an extension portion 33. The extension portion 33 is installed in the receiving groove 15 and includes a bending area 331. Along the extension direction of the extension portion 33, the bending area 331 is located between the positioning member 17 and the disc portion 31. The bending area 331 is bent along the positioning member 17 so that the disc portion 31 approaches the extension portion 33, the positioning member 17, and the insulating member 10.

[0060] In the end cap assembly 100 and energy storage device 1000 of this application, a positioning member 17 is provided on the side wall 151 of the receiving groove 15. The extension 33 of the adapter 30 is installed in the receiving groove 15. When the adapter 30 is bent, the extension 33 abuts against the side of the positioning member 17 near the disk body 31 and is limited, so that the bending area 331 is restricted between the positioning member 17 and the disk body 31. When the adapter 30 is bent to the bending area 331 abutting against the positioning member 17, the extension 33 is limited by the positioning member 17 in the receiving groove 15. Under the pulling force of the extension 33, when the adapter 30 is bent to the bending area 331 abutting against the positioning member 17, the positioning member 17 will generate a reverse force on the bending area 331 due to the abutment. The extension 33 will be pulled by the force, so that the bending area The side of the abutting positioning member 17 near the disk body 31 at position 331 can be bent and deformed under the limiting force of the positioning member 17, the reverse force, and the pulling force of the extension 33, so that the disk body 31 approaches the extension 33, the positioning member 17, and the insulating member 10, thereby blocking the receiving groove 15 and the extension 33 and the positioning member 17 in the receiving groove 15, and making the disk body 31 face the insulating member 10, that is, the disk body 31 mostly covers the insulating member 10, wherein the projection of the disk body 31 along the height direction of the receiving groove 15 mostly covers the projection of the insulating member 10 along the height direction of the receiving groove 15, and the through hole for injecting electrolyte at the center of the disk body 31 does not block the extension 33 in the receiving groove 15. The positioning element 17 makes the bending process easier. Since the positioning element 17 is fixed in the receiving groove 15, after the extension 33 is installed in the receiving groove 15, the bending area 331 in the extension direction of the extension 33 (i.e., along the length direction X of the receiving groove 15) is always located between the positioning element 17 and the disk body 31. This allows the adapter 30 to be bent uniformly in the bending area 331, improving the consistency of the bending of the adapter 30 and thus improving the consistency of the mass production of the energy storage device 1000. Furthermore, the bent disk portion 31 is positioned opposite the insulating member 10 in the height direction Z of the receiving groove 15. In the height direction Z of the receiving groove 15, the projection of the disk portion 31 is located within the first surface 11 of the insulating member 10. This prevents the bent disk portion 31 from extending beyond the first surface 11 due to improper bending position of the adapter 30, which would otherwise result in wasted space, reduced energy density of the energy storage device 1000, and inconvenience in closing the end cap 50 with the housing 200. With the projection of the bent disk portion 31 located within the first surface 11 and the extension portion 33 housed within the receiving groove 15, the space utilization of the energy storage device 1000 can be effectively improved, thereby increasing the energy density of the energy storage device 1000.

[0061] In the embodiments of this application, the positioning member 17 and the insulating member 10 are an integral structure, reducing the assembly process of the positioning member 17 and the insulating member 10. It can be understood that the positioning member 17 and the insulating member 10 can be separate structures, and the positioning member 17 and the insulating member 10 can be connected by welding, snap-fitting or gluing.

[0062] The end cap assembly 100 also includes an end cap 50 and an electrode post 60. The end cap 50 is mounted on the second surface 13 of the insulating member 10. The insulating member 10 is mounted between the end cap 50 and the adapter 30 to provide insulation protection for the end cap 50 and the adapter 30. The adapter 30 connects the electrode post 60 and the tab of the electrode assembly 300, so that the electrode post 60 is electrically connected to the electrode assembly 300 through the adapter 30. Specifically, the disc portion 31 of the adapter 30 is welded to the tab of the electrode assembly 300, and the end of the extension portion 33 is welded to the electrode post 60.

[0063] In the embodiments of this application, the insulating member 10 is further provided with a first through hole 12, and the end cap 50 is provided with a second through hole 51. The first through hole 12 is located at the receiving groove 15, and the pole post 60 is fixed to the end cap 50 by passing through the first through hole 12 and the second through hole 51 in sequence. The flange portion of the pole post 60 is located in the receiving groove 15 and is welded to the extension portion 33 installed in the receiving groove 15.

[0064] Please see Figure 4 and Figure 5 For example, the receiving groove 15 has positioning members 17 on two opposite side walls 151 along the width direction Y. The distance between the two positioning members 17 along the width direction Y of the receiving groove 15 is less than the width of the bending area 331.

[0065] The receiving groove 15 has two opposing sidewalls 151 along the width direction Y, each provided with a positioning element 17. When the bending area 331 is bent along the two positioning elements 17, the force is evenly distributed, improving the consistency of the bending. For example, the line connecting the two positioning elements 17 along the width direction Y can be parallel to the width direction Y. And the distance between the two positioning elements 17 along the width direction Y is less than the width of the bending area 331. When bending the adapter 30, both sides of the bending area 331 (both sides opposite along the width direction Y) abut against the side of the positioning element 17, that is, the side of the positioning element 17 facing closer to the disk body 31, so that the force on both sides of the bending area 331 is balanced, ensuring that the bent disk body 31 is directly opposite the insulating element 10 in the height direction Z, avoiding the projection of the adapter 30 deviating from the projection of the insulating element 10, which would cause the adapter 30 to contact the housing 200 and cause short contact, affecting the cycle performance of the energy storage device 1000.

[0066] Furthermore, along the width direction Y of the receiving groove 15, the ratio of the distance between the two positioning members 17 to the width of the bending area 331 is greater than or equal to 0.67 and less than or equal to 0.80.

[0067] For example, along the width direction Y of the receiving groove 15, the width of the bending area 331 can be greater than or equal to 2.90 cm and less than or equal to 3.10 cm. For instance, the width of the bending area 331 can be 2.90 cm, 2.92 cm, 2.94 cm, 2.95 cm, 2.98 cm, 3.00 cm, 3.03 cm, 3.06 cm, 3.08 cm, or 3.10 cm, and so on. Along the width direction Y of the receiving groove 15, the width of both positioning members 17 can be greater than or equal to 3.00 mm and less than or equal to 5.00 mm. For instance, the width of the positioning member 17 can be 3.00 cm, 3.23 cm, 3.44 cm, 3.60 cm, 3.80 cm, 4.00 cm, 4.23 cm, 4.53 cm, 4.80 cm, or 5.00 cm, and so on. The widths of the two positioning components 17 can be the same or different, provided that the widths of both positioning components 17 are greater than or equal to 3.00 mm and less than or equal to 5.00 mm.

[0068] Under the premise that the width of the bending area 331 is constant along the width direction Y of the receiving groove 15, if the distance between the two positioning members 17 and the width of the bending area 331 are less than 0.67, the spacing between the two positioning members 17 is too narrow, and it will be more difficult to squeeze the extension 33 towards the receiving groove 15 to complete the installation, resulting in low installation efficiency. Under the premise that the width of the bending area 331 is constant along the width direction Y of the receiving groove 15, if the distance between the two positioning members 17 and the width of the bending area 331 are greater than 0.80, the spacing between the two positioning members 17 is too wide. When the adapter 30 bends to the bending area 331 to abut against the positioning member 17, the bending area 331 will abut against the edge of the side wall 151 of the positioning member 17 away from the receiving groove 15. The bending area 331 is easy to be squeezed into the receiving groove 15 along the edge of the positioning member 17, resulting in low installation efficiency. Along the width direction Y of the receiving groove 15, the ratio of the distance between the two positioning members 17 to the width of the bending area 331 is 0.67. This avoids the spacing between the two positioning members 17 being too narrow or too wide, making it easier to squeeze the extension 33 into the receiving groove 15, and ensuring that the bending area 331 does not bend along the edge of the positioning member 17 away from the side wall of the receiving groove 15, thereby improving installation efficiency.

[0069] Please combine Figure 6 For example, along the height direction Z of the receiving groove 15, a gap H is formed between the positioning member 17 and the bottom wall 153 of the receiving groove 15, and the height of the gap H is greater than the thickness of the extension 33.

[0070] When the extension 33 of the adapter 30 is installed in the receiving groove 15, the height of the gap H between the positioning member 17 and the bottom wall 153 of the receiving groove 15 is greater than the thickness of the extension 33. This can effectively limit the extension 33 in the receiving groove 15, and prevent the connection reliability of the welding and fixing of the end of the extension 33 to the pole post 60 from being affected by the pulling force of the extension 33 when the adapter 30 is bent.

[0071] Furthermore, along the height direction Z of the receiving groove 15, the ratio of the height of the gap H to the thickness of the extension 33 is greater than or equal to 2.0 and less than or equal to 3.5.

[0072] For example, along the height direction Z of the receiving groove 15, the thickness of the extension 33 can be greater than or equal to 0.50 mm and less than or equal to 1.50 mm. For instance, the thickness of the extension 33 can be 0.50 mm, 0.60 mm, 0.70 mm, 0.90 mm, 1.00 mm, 1.10 mm, 1.20 mm, 1.30 mm, 1.40 mm, or 1.50 mm, and these are not listed here. Along the height direction Z of the receiving groove 15, the height of the gap H can be greater than or equal to 1.50 mm and less than or equal to 4.50 mm. For instance, the height of the gap H can be 1.50 mm, 2.00 mm, 2.50 mm, 2.96 mm, 3.00 mm, 3.20 mm, 3.50 mm, 4.00 mm, 4.30 mm, or 4.50 mm, and these are not listed here. During the bending and pressing of the extension 33 or the pressing of the extension 33 into the receiving groove 15, the positioning member 17 will deform and move downward. The distance of the downward deformation of the positioning member 17 is greater than or equal to 1 mm and less than or equal to 3 mm. Setting the height of the gap H to be greater than or equal to 1.50 mm and less than or equal to 4.50 mm can provide space for the downward deformation of the positioning member 17.

[0073] Under the premise that the thickness of the extension 33 is constant along the height direction of the receiving groove 15, if the ratio of the height of the gap H to the thickness of the extension 33 is less than 2.0, the height of the gap H is too small. When the extension 33 is squeezed into the receiving groove 15 along the positioning member 17, the deformation of the positioning member 17 in the direction of the receiving groove 15 will occupy a certain space, and the deformed part of the positioning member 17 in the direction of the receiving groove 15 will interfere with the installation of the extension 33. Under the premise that the thickness of the extension 33 is constant along the height direction of the receiving groove 15, if the ratio of the height of the gap H to the thickness of the extension 33 is greater than 3.5, the height of the gap H is too large. When the bending area 331 is bent along the positioning member 17, the bending is more difficult, the bending area 331 is relatively delayed, the area of ​​the adapter 30 after bending is increased, the bending effect is poor, and the height of the gap H is too large. When the adapter 30 is bent, the pulling force of the extension 33 will affect the welding reliability of the extension 33 and the flange of the pole post 60. In the height direction Z of the receiving groove 15, the ratio of the height of the gap H to the thickness of the extension 33 is greater than or equal to 2.0 and less than or equal to 3.5. This prevents the part of the positioning member 17 that deforms in the direction of the receiving groove 15 from interfering with the installation of the extension 33. It also makes it easier to bend the bending area 331 along the positioning member 17, and prevents the bending of the adapter 30 from affecting the reliability of the welding between the extension 33 and the flange of the pole post 60 due to the pulling force of the extension 33.

[0074] Please see Figure 5 and Figure 6 The positioning member 17 includes a first connecting part 171 and a second connecting part 173. One end of the first connecting part 171 is connected to the side wall 151 of the receiving groove 15, and the other end of the first connecting part 171 is connected to one end of the second connecting part 173. The other end of the second connecting part 173 is connected to the side wall 151 of the receiving groove 15. The first connecting part 171 is inclined from the side wall 151 of the receiving groove 15 toward the bottom wall 153 of the receiving groove 15. The side of the first connecting part 171 facing away from the bottom wall 153 of the receiving groove 15 is a slope.

[0075] The first connecting portion 171 is inclined from the side wall 151 of the receiving groove 15 toward the bottom wall 153 of the receiving groove 15, so that the first connecting portion 171 has a slope. When the adapter 30 and the insulating member 10 are assembled, it is easier to press the extension portion 33 of the adapter 30 along the slope of the first connecting portion 171 toward the bottom wall 153 of the receiving groove 15, and it is more convenient for the extension portion 33 of the adapter 30 to be snapped into the receiving groove 15.

[0076] For example, along the height direction Z of the receiving groove 15, there is a gap between the end of the first connecting portion 171 that connects to the side wall 151 of the receiving groove 15 and the end of the second connecting portion 173 that connects to the side wall 151 of the receiving groove 15.

[0077] There is a gap between the first connecting part 171 and the second connecting part 173. When the extension 33 is pressed into the receiving groove 15 along the first connecting part 171, it is easier to deform by compression, making the installation of the extension 33 easier. In addition, there is a gap in the height direction Z of the receiving groove 15 between the connection point of the first connecting part 171 and the side wall 151 of the receiving groove 15 and the connection point of the second connecting part 173 and the side wall 151 of the receiving groove 15. This allows the bending points of the bending area 331 to be distributed into multiple points. For example, the side of the second connecting part 173 facing the disk part 31 has a bending point. After the bending area 331 continues to bend, there is a bending point at the point where the bending area 331 abuts the first connecting part 171. The bending angle range of each bending point is reduced, avoiding the bending point of the adapter 30 from being concentrated in one place in the bending area 331 and the bending angle being too large, which would cause the extension 33 to break. This effectively improves the service life of the energy storage device 1000.

[0078] For example, the connection between the second connecting portion 173 and the side wall 151 of the receiving groove 15 can abut against the connection between the first connecting portion 171 and the side wall 151 of the receiving groove 15. That is to say, there is no gap between the end of the first connecting portion 171 connected to the side wall 151 of the receiving groove 15 and the end of the second connecting portion 173 connected to the side wall 151 of the receiving groove 15. The second connecting portion 173 has a triangular prism structure, which makes the structural strength of the positioning member 17 better. When bent, more area abuts against the bending area 331 of the extension portion 33, giving the bending area 331 a greater reverse compressive force, and making the bending area 331 easier to deform.

[0079] Furthermore, a chamfer 175 is formed at the connection between the first connecting portion 171 and the second connecting portion 173.

[0080] A chamfer 175 is provided at the connection between the first connecting part 171 and the second connecting part 173. This chamfer prevents the positioning member 17 from scratching the extension 33 during the process of pressing the extension 33 against the bottom wall 153 of the receiving groove 15 to install the extension 33 into the receiving groove 15, thus protecting the extension 33. Furthermore, the chamfer 175 allows for easier installation by applying only a small force when pressing the extension 33 until it moves to the connection between the first connecting part 171 and the second connecting part 173, enabling the extension 33 to slide along the curvature of the chamfer 175 towards the bottom wall 153 of the receiving groove 15.

[0081] Please combine Figure 4 and Figure 7 Furthermore, when the adapter 30 is in the unfolded state, the side 1711 of the first connecting part 171 near the disk part 31 and the side 1731 of the second connecting part 173 near the disk part 31 are both arc-shaped.

[0082] It is understandable that, in the unfolded state, with the extension 33 installed towards the receiving groove 15, the side 1711 of the first connecting part 171 near the disk body 31 is arc-shaped. When the bending area 331 bends to abut against the side 1711 of the first connecting part 171 near the disk body 31, it can prevent the bending area 331 from being scratched at the point of contact with the first connecting part 171, thus preventing the bending area from breaking. Alternatively, the side 1731 of the second connecting part 173 near the disk body 31 is arc-shaped. When the bending area 331 bends to abut against the side 1731 of the second connecting part 173 near the disk body 31, it can prevent the bending area 331 from being scratched at the point of contact with the second connecting part 173, thus preventing the bending area from breaking. Alternatively, both the side 1711 of the first connecting part 171 near the disk body 31 and the side 1731 of the second connecting part 173 near the disk body 31 are arc-shaped. When the side 1711 of the first connecting part 171 near the disk body 31 and the side 1731 of the second connecting part 173 near the disk body 31 are both arc-shaped, and the extension 33 is installed in the receiving groove 15 and the adapter 30 is bent, firstly, the bending area 331 is bent to abut against the side 1731 of the second connecting part 173 near the disk body 31, that is, the first bending point of the bending area 331 is formed. When the bending area 331 abuts against the first bending point and bends, the side 1731 of the second connecting part 173 near the disk body 31 is set to be arc-shaped, which can effectively prevent the first bending point from scratching the bending area 331 and causing the bending area 331 to break. After the bending area 331 is bent along the first bending point, the adapter 30 is bent further. At this time, the bending area 331 abuts against the side 1711 of the first connecting part 171 near the disk part 31, which corresponds to the formation of the second bending point of the bending area 331. When the bending area 331 abuts against the second bending point, the side 1711 of the first connecting part 171 near the disk part 31 is set to an arc shape to avoid the second bending point scratching the bending area 331 and causing the bending area 331 to break, thereby extending the service life of the adapter 30 and the service life of the energy storage device 1000. In addition, the side 1711 of the first connecting part 171 near the disk part 31 and the side 1731 of the second connecting part 173 near the disk part 31 are both arc-shaped, which play a bending buffer role when the bending area 331 is bent, so that the bending area 331 has a certain curvature when bent, avoiding excessive bending of the bending area 331 and causing breakage, thus reducing the service life of the energy storage device 1000.

[0083] Please combine Figure 8 For example, the positioning member 17 also includes a protrusion 177, which is provided on the side of the first connecting part 171 away from the bottom wall 153 of the receiving groove 15. The distance D between the top of the protrusion 177 and the first surface 11 satisfies: 1mm≤D≤4mm.

[0084] The distance D between the top of the protrusion 177 and the first surface 11 can be 1mm, 1.4mm, 1.7mm, 2mm, 2.4mm, 2.8mm, 3mm, 3.3mm, 3.8mm, or 4mm. The distance D between the top of the protrusion 177 and the first surface 11 is greater than or equal to 1mm and less than or equal to 4mm, ensuring a certain gap between the protrusion 177 and the first surface 11. After the adapter 30 is bent, the disk portion 31 can abut against the top wall of the protrusion 177, supporting the disk portion 31 relative to the first surface 11 by a certain distance. This prevents the adapter 30 from breaking due to excessive bending, ensuring the service life of the energy storage device 1000.

[0085] The protrusion 177 can be made of low-elasticity plastic. The protrusion 177 can act as a buffer during the bending of the adapter 30 to prevent excessive bending. In addition, the protrusion 177 abuts against the disk body 31, which can keep the structure of the adapter 30 stable when the energy storage device 1000 is dropped or impacted, and prevent the bending area 331 of the adapter 30 from breaking due to severe impact vibration.

[0086] Please combine Figure 4 , Figure 5 and Figure 9 For example, the insulating member 10 also includes a limiting member 19, which is disposed on the bottom wall 153 of the receiving groove 15, and the extension 33 is provided with a mating hole 333 corresponding to the limiting member 19, through which the limiting member 19 passes.

[0087] A limiting member 19 is provided on the bottom wall 153 of the receiving groove 15, and a mating hole 333 corresponding to the limiting member 19 is provided on the extension 33. When the adapter 30 and the insulating member 10 are assembled, the limiting member 19 is passed through the mating hole 333 to limit the extension 33, so as to avoid the stretching force when the extension 33 is bent, which would cause the end of the extension 33 to not correspond to the flange of the pole post 60, and ensure the reliability of the connection between the end of the extension 33 and the flange of the pole post 60.

[0088] The number of limiting members 19 can be one or more. In the embodiment of this application, the number of limiting members 19 is two. The two limiting members 19 are disposed on the bottom wall 153 of the receiving groove 15, and are staggered along the straight line of the width direction Y of the receiving groove 15. Correspondingly, the number of mating holes 333 is also two. The staggered limiting members 19 can limit the extension 33 installed in the receiving groove 15 in the length direction X and the width direction Y. When the adapter 30 is bent, it can effectively prevent the adapter 30 from deflecting and improve the accuracy of bending.

[0089] Specifically, the assembly process of the energy storage device 1000 is as follows:

[0090] First, the electrode post 60 is sequentially passed through the first through hole 12 of the insulating member 10 and the second through hole 51 of the end cap; the extension 33 of the adapter 30 is pressed from the first surface 11 of the insulating member 10 toward the second surface 13, so that the limiting member 19 in the receiving groove 15 is aligned with the mating hole 333 of the extension 33, the extension 33 is pressed and passes over the positioning member 17, and then the extension 33 is confined in the receiving groove 15; the end of the extension 33 is welded and fixed to the flange of the electrode post 60; second, the disc body 31 of the adapter 30 is welded and fixed to the electrode tab of the electrode assembly 300; third, the bending area 331 is abutted against the positioning member 17 and bent under the limiting of the positioning member 17 and the pulling force of the extension 33, bending the disc body 31 to a position where the disc body 31 is basically coaxial with the first through hole 12; finally, the electrode assembly 300 is placed into the housing 200, the end cap is closed and welded to seal the opening of the housing 200.

[0091] This application also provides an electrical device. The electrical device includes the energy storage device 1000 provided in this application embodiment, which is used to supply power to the electrical device. The electrical device may include, but is not limited to, electric vehicles, electric toys, power tools, electric vehicles, ships and spacecraft, mobile phones, portable devices, PDAs, laptops, etc.

[0092] In the electrical equipment of this application, a positioning member 17 is provided on the side wall 151 of the receiving groove 15. The extension 33 of the adapter 30 is installed in the receiving groove 15. When the adapter 30 is bent, the extension 33 abuts against the side of the positioning member 17 near the disk body 31 and is limited, so that the bending area 331 is restricted between the positioning member 17 and the disk body 31. When the adapter 30 is bent to the point that the bending area 331 abuts against the positioning member 17, the extension 33 is fixed. Positioning member 17 is confined within receiving groove 15. Under the pulling force of extension 33, adapter 30 bends to the bending area 331, which abuts against the side of positioning member 17 near disk body 31, so that disk body 31 approaches extension 33, positioning member 17 and insulating member 10, thereby blocking receiving groove 15 and blocking extension 33 and positioning member 17 within receiving groove 15, and making disk body 31 opposite to insulating member 10. The positioning element 17 makes the bending process easier. Since the positioning element 17 is fixed in the receiving groove 15, after the extension 33 is installed in the receiving groove 15, the bending area 331 in the extension direction of the extension 33 (i.e., along the length direction of the receiving groove 15) is always located between the positioning element 17 and the disk body 31. This allows the adapter 30 to be bent uniformly in the bending area 331, improving the consistency of the bending of the adapter 30 and thus improving the consistency of the mass production of the energy storage device 1000. Furthermore, the bent disk portion 31 is positioned opposite the insulating member 10 in the height direction Z of the receiving groove 15. In the height direction Z of the receiving groove 15, the projection of the disk portion 31 is located within the first surface 11 of the insulating member 10. This prevents the bent disk portion 31 from extending beyond the first surface 11 due to improper bending position of the adapter 30, which would otherwise result in wasted space, reduced energy density of the energy storage device 1000, and inconvenience in closing the end cap 50 with the housing 200. With the projection of the bent disk portion 31 located within the first surface 11 and the extension portion 33 housed within the receiving groove 15, the space utilization of the energy storage device 1000 can be effectively improved, thereby increasing the energy density of the energy storage device 1000.

[0093] The above are some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. An end cap assembly, characterized in that, include: An insulating component includes a first surface and a second surface facing away from each other. The insulating component has a receiving groove formed in a recessed manner from the first surface toward the second surface. A positioning element is provided on the side wall of the receiving groove, and the positioning element protrudes from the side wall of the receiving groove. An adapter includes a connected disc body and an extension, the extension being mounted in the receiving groove, the extension including a bending area along the extending direction of the extension, the bending area being located between the positioning member and the disc body; The bending area is bent along the positioning member so that the disc body is close to the extension, the positioning member and the insulating member. The positioning member is provided on both of the two opposite side walls of the receiving groove along the width direction. The distance between the two positioning members along the width direction of the receiving groove is less than the width of the bending area.

2. The end cap assembly according to claim 1, characterized in that, Along the width direction of the receiving groove, the ratio of the distance between the two positioning members to the width of the bending area is greater than or equal to 0.67 and less than or equal to 0.

80.

3. The end cap assembly according to claim 1, characterized in that, Along the height direction of the receiving groove, a gap is formed between the positioning member and the bottom wall of the receiving groove, and the height of the gap is greater than the thickness of the extension.

4. The end cap assembly according to claim 3, characterized in that, Along the height direction of the receiving groove, the ratio of the height of the gap to the thickness of the extension is greater than or equal to 2.0 and less than or equal to 3.

5.

5. The end cap assembly according to claim 1, characterized in that, The positioning component includes a first connecting part and a second connecting part. One end of the first connecting part is connected to the side wall of the receiving groove, and the other end of the first connecting part is connected to one end of the second connecting part. The other end of the second connecting part is connected to the side wall of the receiving groove. The first connecting part is inclined from the side wall of the receiving groove toward the bottom wall of the receiving groove, and the side of the first connecting part facing away from the bottom wall of the receiving groove is a slope.

6. The end cap assembly according to claim 5, characterized in that, Along the height direction of the receiving groove, there is a gap between the end of the first connecting part that is connected to the side wall of the receiving groove and the end of the second connecting part that is connected to the side wall of the receiving groove.

7. The end cap assembly according to claim 5, characterized in that, The connection between the first connecting part and the second connecting part has a chamfer.

8. The end cap assembly according to claim 5, characterized in that, When the adapter is in the unfolded state, at least one of the side of the first connecting part near the disk body and the side of the second connecting part near the disk body is arc-shaped along the extending direction of the adapter.

9. The end cap assembly according to claim 5, characterized in that, The positioning element also includes a protrusion, which is located on the side of the first connecting part away from the bottom wall of the receiving groove. The distance D between the top of the protrusion and the first surface satisfies: 1mm≤D≤4mm.

10. The end cap assembly according to claim 1, characterized in that, The insulating component also includes a limiting component, which is disposed on the bottom wall of the receiving groove. The extension portion is provided with a mating hole corresponding to the limiting component, and the limiting component passes through the mating hole.

11. An energy storage device, characterized in that, The device includes a housing, an electrode assembly, and an end cap assembly as described in any one of claims 1 to 10. The housing has an opening, the electrode assembly is housed within the housing, and the end cap assembly further includes a post and an end cap. The post passes through the end cap and an insulating member of the end cap assembly and is electrically connected to the electrode assembly via an adapter of the end cap assembly. The end cap closes to the opening, the insulating member is connected to the end cap, and the insulating member is located between the adapter and the end cap.

12. An electrical appliance, characterized in that, It includes the energy storage device as described in claim 11, wherein the energy storage device supplies power to the electrical equipment.

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