CN222980645U - End cover assembly, energy storage device and electric equipment - Google Patents

Abstract

The present application discloses an end cover assembly, an energy storage device and an electrical equipment, and relates to the field of energy storage technology. The end cover assembly includes: an end cover with a mounting hole; a pole, including a columnar body, a first flange and a second flange, the columnar body including a reducing section, the side wall of the reducing section is inclined relative to the axial direction of the columnar body, and at least part of the reducing section is located in the mounting hole; a seal, including a cylindrical body and a first sealing part, the cylindrical body is sleeved on the columnar body, and the first sealing part is clamped between the first flange and the end cover. In the embodiment of the present application, at least part of the reducing section on the columnar body is located in the mounting hole, so that through the cooperation between the reducing section and the wall of the mounting hole, at least part of the cylindrical body is formed by oblique extrusion, that is, the cylindrical body forms an oblique seal between the columnar body and the wall of the mounting hole, thereby improving the reliability of the sealing after the pole is assembled.

Description

End cover assembly, energy storage device and electric equipment

Technical Field

The application relates to the technical field of energy storage, in particular to an end cover assembly, an energy storage device and electric equipment.

Background

Secondary batteries, also called rechargeable batteries or secondary batteries, are batteries that can be used continuously by activating active materials by charging after discharging. The recyclable characteristic of the secondary battery gradually becomes a main power source of electric equipment, and as the demand of the secondary battery gradually increases, the performance requirements of people on all aspects of the secondary battery are also higher and higher, and particularly the service life is required.

In the related art, a secondary battery is generally composed of an end cap assembly, an electrode assembly, and a case. The actual production process is to manufacture an end cover unit, an electrode assembly and a shell respectively, then use metal adapter to weld the pole post of the end cover unit and the pole lug of the electrode assembly respectively, then put the electrode assembly into the shell, and then use the end cover unit to cover the opening of the shell and then weld and seal so as to form the basic structure of the secondary battery. Then, the electrolyte is injected manually through the injection liquid Kong Jiazhu arranged on the end cover unit, and the injection hole is welded and sealed after the completion.

In the related art, the end cap unit includes end cap and utmost point post, and the utmost point post runs through and sets up on the end cap, and realizes the seal between utmost point post and the end cap through the sealing member. However, in the related art, for the seal between the post and the end cap, the reliability of the seal is not effectively ensured.

Disclosure of utility model

The application provides an end cover assembly, an energy storage device and electric equipment, wherein the end cover assembly can improve sealing reliability of a pole and an end cover.

In order to achieve the purposes of the application, the application adopts the following technical scheme:

According to one aspect of the application, an end cover assembly is provided, which comprises an end cover, a pole column, a sealing piece and a sealing piece, wherein the end cover is provided with a mounting hole penetrating through the end cover, the pole column comprises a cylindrical body, a first flange and a second flange which are respectively connected with two ends of the cylindrical body along the axial direction, the cylindrical body penetrates through the mounting hole, the first flange and the second flange are respectively positioned at two sides of the end cover along the thickness direction, the cylindrical body comprises a reducing section, the side wall of the reducing section is inclined relative to the axial direction of the cylindrical body, at least part of the reducing section is positioned in the mounting hole, the sealing piece comprises a cylindrical body and a first sealing part connected with the first end of the cylindrical body along the axial direction, the cylindrical body is sleeved on the cylindrical body, and the first sealing part is clamped between the first flange and the end cover.

According to the embodiment of the application, the sealing between the first flange and the end cover can be realized through the first sealing part included in the sealing piece, so that the sealing between the pole and the end cover in the thickness direction of the end cover is realized, and through the arrangement that at least part of the reducing section on the cylindrical body is positioned in the mounting hole, the inclined extrusion of at least part of the cylindrical body is realized through the cooperation of the reducing section and the wall of the mounting hole, namely the extrusion of at least part of the cylindrical body along the circumferential direction and the radial direction of the cylindrical body is realized, so that the cylindrical body forms the inclined sealing between the cylindrical body and the wall of the mounting hole. Therefore, when the pole is offset relative to the end cover along the thickness direction, the first sealing part between the first flange and the end cover is in sealing failure, but the inclined extrusion of at least part of the cylindrical body can still be realized due to the matching of the reducing section and the wall of the mounting hole, so that the sealing reliability of the pole on the end cover is ensured.

According to an embodiment of the application, in a direction in which the second flange points to the first flange, the side wall of the reducing section is inclined in a direction approaching the center line of the columnar body.

According to one embodiment of the present application, the end surface of the columnar body near the second flange is provided with a pressing hole.

In the embodiment of the application, when the terminal post is extruded from the end face of the terminal post far away from the first flange, the end part of the terminal post far away from the first flange is conveniently caused to expand in the radial direction of the columnar body through the arrangement of the extrusion holes, namely, the first reducing section close to the second flange is conveniently formed on the columnar body.

According to an embodiment of the present application, the outer edge of the second flange has a plurality of notches distributed at intervals along the circumferential direction.

In the embodiment of the application, the notch is arranged on the upper outer edge of the second flange, namely, the notch is arranged on the end face edge of the pole before the pole is extruded away from the end face of the first flange, so that the resistance during extrusion is conveniently reduced when the pole is extruded, and the extrusion effect of the pole is improved.

According to an embodiment of the present application, the notch is V-shaped.

According to an embodiment of the present application, the seal further includes a second sealing portion connected to the second end of the cylindrical body in the axial direction and located between the second flange and the end cap.

In the embodiment of the application, the second sealing part is arranged on the sealing piece, so that the sealing between the second flange and the end cover can be realized, further sealing between the pole and the end cover in the thickness direction of the end cover can be realized, and meanwhile, the insulation performance between the second flange and the end cover is ensured.

According to one embodiment of the application, the end cover comprises a cover plate and lower plastic, the lower plastic is located on one side of the cover plate in the thickness direction, the mounting holes penetrate through the cover plate and the lower plastic, the first flange is located on one side of the cover plate, which is away from the lower plastic, and the second flange is located on one side of the lower plastic, which is away from the cover plate.

According to one embodiment of the application, the end cover assembly comprises an insulating piece, wherein the insulating piece comprises an annular isolation part and a wrapping part, the isolation part is positioned between the first flange and the end cover and sleeved on the first sealing part, the wrapping part is connected with the isolation part and positioned on one side, away from the end cover, of the isolation part, and at least part of the first flange is positioned in an area surrounded by the wrapping part.

In the embodiment of the application, the gap between the first flange of the pole and the end cover can be sealed through the first sealing part and the isolation part, so that the sealing area and the insulation area between the first flange and the end cover are increased, the sealing effect and the insulation effect of the first flange and the end cover are improved, meanwhile, the accommodating groove is formed by surrounding the wrapping part, and further, after the first flange is accommodated in the accommodating groove, the wrapping of the first flange is realized, and the insulation performance of the first flange and the end cover is ensured.

According to one aspect of the present application, there is provided an energy storage device comprising a case including a receiving cavity having an opening, an electrode assembly received in the receiving cavity, and the end cap assembly of the above aspect, the end cap assembly sealing the opening of the receiving cavity, and the electrode post being connected to the electrode assembly.

According to an aspect of the present application, there is provided a powered device, the powered device including the energy storage device according to the above aspect, the energy storage device supplying power to the powered device.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.

Drawings

The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a schematic diagram of an energy storage system according to an exemplary embodiment.

Fig. 2 is a schematic cross-sectional structure of an energy storage device according to an exemplary embodiment.

FIG. 3 is a schematic exploded view of an end cap assembly according to an exemplary embodiment.

FIG. 4 is an enlarged partial schematic view of the end cap assembly of FIG. 3.

FIG. 5 is a schematic cross-sectional view of another end cap assembly according to an exemplary embodiment.

FIG. 6 is a schematic cross-sectional view of an end cap assembly shown in accordance with an exemplary embodiment.

FIG. 7 is an enlarged partial schematic view of the end cap assembly of FIG. 5.

Fig. 8 is an enlarged partial schematic view of the end cap assembly of fig. 3.

Fig. 9 is a schematic diagram of a powered device according to an example embodiment.

Wherein reference numerals are as follows:

100. 200 parts of energy storage device, 300 parts of electric energy conversion device, 300 parts of user load, 400 parts of electric equipment;

10. casing, 20, electrode assembly, 30, end cover assembly, 40, metal adapter;

11. a receiving chamber;

31. end cap, 32, pole, 33, sealing element, 34, insulating element;

311. Mounting holes 312, cover plates 313 and lower plastic;

321. the cylindrical body 322, the first flange 323, the second flange 324, the reducing section 325, the extrusion hole 326 and the notch;

331. 332, a first sealing part, 333, a second sealing part;

341. isolation part 342, wrapping part.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

Because of the strong timeliness and space properties of energy sources required by people, in order to reasonably utilize the energy sources and improve the utilization rate, one energy form needs to be used in the same energy form through a medium or equipment, or converted into another energy form to be stored, and then released in a specific energy form based on future application.

At present, the green energy mainly comprises light energy, wind energy and the like, and the problems of strong intermittence and large fluctuation of the light energy, the wind energy and the like generally exist, so that the voltage of a green power grid is unstable (insufficient electricity is used in a peak period and too much electricity is used in a valley period), and the unstable voltage can cause damage to the electric power, so that the problem of 'wind discarding and light discarding' possibly occurs due to insufficient electricity demand or insufficient power grid receiving capability.

To solve the problem of insufficient power demand or insufficient power grid acceptance, an energy storage device must be relied on. The energy storage device converts the electric energy into other forms of energy through physical or chemical means to store the energy, the energy stored by the energy storage device is converted into the electric energy to be released when needed, in short, the energy storage device is similar to a large-scale 'charge pal', when the light energy and the wind energy are sufficient, the electric energy is stored, and the stored electric energy is released when needed.

The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as power generation side energy storage, electric network side energy storage, renewable energy grid-connected energy storage, user side energy storage and the like, the types of corresponding energy storage devices include:

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;

(2) The main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because the electricity charge at the peak-valley position has larger price difference according to the electricity consumption demand, after the user has the energy storage equipment, the energy storage device is usually charged in the low-price period of the electricity charge, and the electricity in the energy storage device is released for use in the peak-price period of the electricity charge, so that the purpose of saving the electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.

Embodiments of the present application provide an energy storage system including an energy storage device to enable storage of electrical energy, or supply of electrical energy, by the energy storage device.

Taking a household energy storage scenario in user side energy storage as an example, fig. 1 shows a schematic diagram of an energy storage system according to an embodiment of the present application, where the energy storage system includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, a household appliance, etc.), the electric energy conversion device 200 is electrically connected to the energy storage device 100, the energy storage device 100 is electrically connected to the user load 300, and the energy storage device 100 is a small energy storage box and may be installed on an outdoor wall in a wall-hanging manner. Specifically, the power conversion device 200 may convert solar energy into electric energy and store the electric energy by the energy storage device 100, and thus supply the electric energy to the consumer load 300 for use at the time of peak electricity prices or supply the electric energy to the consumer load 300 for use at the time of grid outage/outage.

The energy storage device 100 may be, but is not limited to, a single battery (secondary battery), a battery module composed of single batteries, a battery pack, a battery system, and the like. The battery cell may be a lithium ion battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, etc., and the battery cell may be a cylinder, a flat body, a cuboid, etc., which is not limited in the embodiment of the present application. In particular, the battery cell may implement a charge and discharge process using a chemical reaction or change of an energy storage medium (chemical element). In short, the electric energy generated by light energy and wind energy is stored in the battery monomer through chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in the battery monomer is released for use through the chemical reaction or change of the energy storage medium, or is transferred for use.

In some embodiments, as shown in fig. 2, the energy storage device 100 includes a case 10, an electrode assembly 20, and an end cap assembly 30, the case 10 having an open receiving cavity 11, the electrode assembly 20 being received in the receiving cavity 11, the end cap assembly 30 sealing the opening of the receiving cavity 11.

The housing 10 may have a cylindrical structure with one end opened, where the energy storage device 100 includes one end cap assembly 30 to seal one opening of the housing 10, or the housing 10 may have a cylindrical structure with two ends opened, where the energy storage device 100 includes one end cap assembly 30 and one end cap 31, or two end cap assemblies 30, such that one end cap assembly 30 and one end cap 31, or two end cap assemblies 30 can seal two openings of the housing 10, respectively.

As shown in fig. 2, the end cap assembly 30 includes an end cap 31 and a pole 32 penetrating through the end cap 31, the end cap 31 seals the opening of the case 10, one end of the pole 32 is connected to the electrode assembly 20, and the other end is exposed at a side of the end cap 31 away from the electrode assembly 20, so as to serve as an output end of the energy storage device 100.

The end cap 31 may include only a cap plate 312 (such as an insulating plate, etc.) to seal the opening of the case 10 through the cap plate 312, or may include a cap plate 312 (such as a photo-aluminum sheet, etc.) and a lower plastic 313 as shown in fig. 2, wherein the cap plate 312 seals the opening of the case 10, and the lower plastic 313 is positioned at a side of the cap plate 312 facing the electrode assembly 20 to achieve insulation between the electrode assembly 20 and the cap plate 312. In addition, an explosion-proof hole may be formed in the end cap 31, the end cap assembly 30 includes an explosion-proof valve installed in the explosion-proof hole, so that gas generated by the energy storage device 100 during thermal runaway is discharged along the explosion-proof valve, and the risk of explosion of the energy storage device 100 is reduced, and a liquid injection hole may be formed in the end cap 31, so that electrolyte is injected into the accommodating cavity 11 of the casing 10 along the liquid injection hole after the assembly of the energy storage device 100 is completed, so as to achieve infiltration of the electrode assembly 20.

The electrode assembly 20 includes a positive plate, a negative plate, and a separator, wherein the separator is located between the positive plate and the negative plate, and edges of the positive plate and the negative plate are provided with tabs to form positive tabs and negative tabs of the energy storage device 100. The positive electrode tab and the negative electrode tab may be located at the same end of the electrode assembly 20 or may be located at different ends of the electrode assembly 20, and when the positive electrode tab and the negative electrode tab are located at two ends of the electrode assembly 20, one of the positive electrode tab and the negative electrode tab is connected to the electrode post 32 included in the end cap assembly 30, and the other is connected to the bottom of the case 10 or the electrode post 32 included in the other end cap assembly 30, so as to output electric energy.

It should be noted that, as shown in fig. 2, the energy storage device 100 may further include a metal adaptor 40, so as to connect the electrode assembly 20 and the electrode post 32 through the metal adaptor 40, thereby ensuring the current carrying capability between the electrode post 32 and the electrode assembly 20.

In the related art, for the end cap assembly 30 included in the energy storage device 100, when the pole 32 is assembled on the end cap 31, sealing in the thickness direction of the end cap 31 can only be achieved, so that when the pole 32 is offset in the thickness direction of the end cap 31, the sealing between the pole 32 and the end cap 31 is very easy to fail, and further, the risk of electrolyte leakage is brought.

The embodiment of the application provides an end cover assembly 30, when a pole column 32 included in the end cover assembly 30 is assembled on an end cover 31, not only can a seal be formed in the thickness direction of the end cover 31, but also can a seal be formed in the direction perpendicular to the thickness direction of the end cover 31, so that the reliability of the seal between the pole column 32 and the end cover 31 is effectively improved, and the risk of electrolyte leakage is avoided.

In some embodiments, as shown in fig. 3 and 4, the end cap assembly 30 comprises an end cap 31, a pole 32 and a sealing member 33, wherein the end cap 31 is provided with a mounting hole 311 penetrating through, the pole 32 comprises a columnar body 321, a first flange 322 and a second flange 323 respectively connected with two ends of the columnar body 321 along the axial direction, the columnar body 321 penetrates through the mounting hole 311, the first flange 322 and the second flange 323 are respectively positioned on two sides of the end cap 31 along the thickness direction, the sealing member 33 comprises a cylindrical body 331 and a first sealing part 332 connected with the first end of the cylindrical body 331 along the axial direction, the cylindrical body 331 is sleeved on the columnar body 321, and the first sealing part 332 is clamped between the first flange 322 and the end cap 31.

In addition, the spacing between the side wall of at least a portion of the columnar body 321 and the wall of the mounting hole 311 varies in the thickness direction of the end cap 31. By arranging the spacing between the side wall of at least part of the column body 321 and the hole wall of the mounting hole 311 along the thickness direction of the end cover 31, the side wall of at least part of the column body 321 is inclined to the hole wall of the mounting hole 311 to a certain extent, and thus the column body 331 included in the seal 33 can be extruded (i.e. the column body 331 is obliquely extruded) in the thickness direction of the end cover 31 and in the direction perpendicular to the thickness direction of the end cover 31, so as to realize the oblique sealing between the column body 321 and the hole wall of the mounting hole 311. In this way, when the pole 32 is offset from the end cover 31 in the thickness direction of the end cover 31, the first sealing portion 332 between the first flange 322 and the end cover 31 fails in sealing, but due to the inclination of the side wall of at least part of the section on the columnar body 321 relative to the wall of the mounting hole 311, the columnar body 331 included in the sealing member 33 can still be pressed, so as to ensure the sealing reliability of the pole 32 on the end cover 31.

The wall thickness of the cylindrical body 331 is greater than or equal to the maximum distance between the sidewall of the cylindrical body 321 and the hole wall of the mounting hole 311, so as to ensure that the cylindrical body 331 can be extruded after the pole 32 is assembled on the end cover 31.

The pole 32 includes a cylindrical body 321, a first flange 322, and a second flange 323 that are integrally formed, and at least one of the first flange 322 and the second flange 323 is formed by extruding the pole 32 through the mounting hole 311 on the end cover 31, and at the same time, when the pole 32 is extruded, the seal 33 includes the cylindrical body 331 by deforming the pole 32, so that the reliability of the seal of the cylindrical body 331 is improved. As an example, as shown in connection with fig. 5 and 6, the pole 32 has only the first flange 322 before being assembled to the end cap 31, the mounting hole 311 in the end cap 31 is penetrated by the pole 32, and the end surface of the pole 32 remote from the first flange 322 is pressed to form the second flange 323. Of course, the pole 32 includes a columnar body 321 and a first flange 322 that are integrally formed, and a second flange 323 that is formed by caulking. Specifically, the pole 32 includes a columnar body 321, a first flange 322 and a pressing block (riveting block), after an integral structure including the columnar body 321 and the first flange 322 passes through the mounting hole 311 on the end cover 31, the pressing block is sleeved at the end part of the columnar body 321 far away from the first flange 322, the pressing block and the columnar body 321 are fixed by extruding the end surface of the columnar body 321 far away from the first flange 322, and meanwhile, a second flange 323 is formed by the pressing block, so that the assembly of the pole 32 on the end cover 31 is realized.

The cylindrical body 331 and the first sealing portion 332 included in the seal member 33 may be an integral structure, and the first sealing portion 332 may be formed in advance, or may be formed by assembling the pole 32 in the mounting hole 311, and pressing the first flange 322 and the end cap 31 to cause the seal member 33 to deform, which is not limited in the embodiment of the present application. The connection between the columnar body 321 and the first flange 322, the second flange 323, and the orifice edge of the mounting hole 311 may be provided with arc chamfers, so as to avoid the damage of the sealing element 33 caused by stress concentration.

In addition, in the case that the end cap 31 includes the cover plate 312 and the lower plastic 313, the lower plastic 313 may be located at one side of the cover plate 312 along the thickness direction, the mounting hole 311 penetrates the cover plate 312 and the lower plastic 313, the first flange 322 is located at one side of the cover plate 312 facing away from the lower plastic 313, and the second flange 323 is located at one side of the lower plastic 313 facing away from the cover plate 312.

In some embodiments, as shown in fig. 5 and 7, the end cover assembly 30 comprises an insulating member 34, wherein the insulating member 34 comprises a partition 341 and a wrapping portion 342, the partition 341 is located between the first flange 322 and the end cover 31 and sleeved on the first sealing portion 332, the wrapping portion 342 is connected with the partition 341 and located on one side of the partition 341 away from the end cover 31, and at least part of the first flange 322 is located in an area surrounded by the wrapping portion 342.

The first sealing portion 332 and the isolation portion 341 are both in planar annular structures, and thicknesses of the first sealing portion 332 and the isolation portion 341 are approximately equal, so that the first sealing portion 332 and the isolation portion 341 can simultaneously seal a gap between the first flange 322 of the pole 32 and the end cover 31, thereby increasing a sealing surface and an insulation area between the first flange 322 and the end cover 31, and improving a sealing effect and an insulation effect between the first flange 322 and the end cover 31.

Wherein, the wrapping portion 342 is a columnar ring structure, so that after being connected with the isolation portion 341, a containing groove can be defined, and then after the first flange 322 is contained in the containing groove, the wrapping of the first flange 322 is achieved, and the insulation performance of the first flange 322 and the end cover 31 is ensured.

In the embodiment of the present application, in order to realize the oblique sealing between the cylindrical body 331 and the hole wall of the mounting hole 311, as shown in fig. 7, the distance between the portion of the cylindrical body 321 near the second flange 323 and the hole wall of the mounting hole 311 decreases in the direction near the first flange 322, the distance between the portion of the cylindrical body 321 near the first flange 322 and the hole wall of the mounting hole 311 decreases in the direction near the second flange 323, or the distance between the portion of the cylindrical body 321 near the second flange 323 and the hole wall of the mounting hole 311 decreases in the direction near the first flange 322, and the distance between the portion of the cylindrical body 321 near the first flange 322 and the hole wall of the mounting hole 311 decreases in the direction near the second flange 323.

Wherein, the hole wall of the mounting hole 311 may have a reducing hole section, and/or the columnar body 321 may have a reducing section 324. When the mounting hole 311 has a reducing hole section, the cross-sectional area of the reducing hole section perpendicular to the thickness direction of the end cover 31 is changed along the thickness direction of the end cover 31 to realize oblique extrusion of the cylindrical body 331 through the cooperation of the reducing hole section of the mounting hole 311 and the cylindrical body 321, when the cylindrical body 321 has a reducing section 324, the side wall of the reducing section 324 is inclined relative to the axial direction of the cylindrical body 321, that is, the cross-sectional area of the reducing section 324 perpendicular to the thickness direction of the end cover 31 is changed along the thickness direction of the end cover 31, and at least part of the reducing section 324 is positioned in the mounting hole 311 to realize oblique extrusion of at least part of the cylindrical body 331 through the cooperation of the reducing section 324 of the cylindrical body 321 and the wall of the mounting hole 311. In this way, when the pole 32 is offset from the end cover 31 in the thickness direction, the first sealing portion 332 between the first flange 322 and the end cover 31 fails in sealing, but due to the matching between the reducing section 324 and the wall of the mounting hole 311, at least part of the cylindrical body 331 can be obliquely pressed, so as to ensure the sealing reliability of the pole 32 on the end cover 31.

Next, explanation will be made taking the case where the columnar body 321 has the reducing section 324 as an example.

The reducing section 324 on the columnar body 321 may be formed after the end surface of the columnar body 321 far from the first flange 322 is extruded, or may be formed after the end surface of the columnar body 321 far from the second flange 323 is extruded.

In some embodiments, as shown in fig. 5 and 7, in a direction in which the second flange 323 points toward the first flange 322, the sidewall of the variable-diameter section 324 is inclined toward a direction near the center line of the columnar body 321.

The reducing section 324 is formed by liquid accumulation on the end surface of the columnar body 321 far away from the first flange 322, so that the distance between the part of the columnar body 321 near the second flange 323 and the hole wall of the mounting hole 311 is gradually decreased in the direction near the first flange 322, and the part of the columnar body 331 of the sealing element 33 sleeved on the reducing section 324 forms oblique sealing, so that the sealing reliability of the polar column 32 and the end cover 31 is ensured.

In connection with the above, the second flange 323 included in the pole 32 may be formed by extruding the end surface of the pole 32 away from the first flange 322, where the end surface of the pole 32 away from the first flange 322 may be a plane, that is, the end surface of the columnar body 321 near the second flange 323 is a plane, or the end surface of the pole 32 away from the first flange 322 has an extruding hole 325, that is, as shown in fig. 6 or fig. 7, the end surface of the columnar body 321 near the second flange 323 has an extruding hole 325.

In this way, when the terminal 32 is pressed against the end face of the terminal 32 away from the first flange 322, the end of the terminal 32 away from the first flange 322 is facilitated to expand in the radial direction of the cylindrical body 321 by the arrangement of the pressing hole 325, that is, the first reducing section 3241 close to the second flange 323 is facilitated to be formed on the cylindrical body 321.

Wherein the shape of the extrusion orifice 325 may be determined in conjunction with the shape of the extrusion tool. Illustratively, the extrusion hole 325 may be a tapered blind hole, a semi-elliptical blind hole, a hemispherical blind hole, etc., where the extrusion tool has a cylindrical protrusion, or a larger sized tapered protrusion, semi-elliptical protrusion, hemispherical protrusion, etc., or where the extrusion hole 325 is a cylindrical blind hole, etc., where the extrusion tool has a tapered protrusion. When the extrusion hole 325 is a tapered blind hole, a semi-elliptical blind hole or a hemispherical blind hole, and the extrusion tool has a larger tapered protrusion, a semi-elliptical protrusion or a hemispherical protrusion, the extrusion area of the pole 32 can be increased, thereby facilitating improvement of the assembly efficiency of the pole 32 on the end cap 31.

Optionally, as shown in fig. 8, the outer edge of the second flange 323 has a plurality of notches 326 circumferentially spaced apart. In this way, the notch 326 provided at the upper outer edge of the second flange 323, that is, the notch 326 is provided at the end surface edge of the pole 32 before the pole 32 is pressed away from the end surface of the first flange 322, so that when the pole 32 is pressed, the resistance during pressing is reduced, and the pressing effect on the pole 32 is improved.

The notch 326 provided at the outer edge of the second flange 323 may be V-shaped, circular arc-shaped, or the like, and the embodiment of the present application is not limited to this, because of the uncontrollability of the end of the pole 32 away from the first flange 322 to deform when the pole 32 is pressed, so that the notch 326 provided at the outer edge of the second flange 323 may also start other shapes, or other anisotropic notches 326, or the like.

In some embodiments, as shown in fig. 5 and 7, the seal 33 includes a second seal portion 333, the second seal portion 333 being connected to an outer wall end of the cylindrical body 331 and located between the second flange 323 and the end cap 31.

In this way, by the second sealing portion 333 included in the seal 33, sealing between the second flange 323 and the end cover 31 can be achieved, thereby achieving further sealing of the pole 32 and the end cover 31 in the thickness direction of the end cover 31, while achieving insulation between the second flange 323 and the end cover 31.

The second sealing portion 333 and the cylindrical body 331 may be integrally formed, and the second sealing portion 333 may be pre-manufactured or formed along with synchronous deformation of the pole 32 when the pole 32 is pressed.

The embodiment of the application also provides electric equipment 400, and the electric equipment 400 can be a user energy storage cabinet, an energy storage container and the like. As shown in fig. 9, the electric device 400 includes the energy storage device 100 according to the foregoing embodiment, and the energy storage device 100 supplies power to the electric device 400. Thus, in combination with the above, the electric device 400 of the present application can ensure the stability of the operation of the electric device 400 during the use process.

In embodiments of the present application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and the term "plurality" is intended to refer to two or more unless otherwise expressly defined. The terms "mounted," "connected," "secured," and the like are to be construed broadly, as they are used in a fixed or removable connection, or as they are integral with one another, as they are directly or indirectly connected through intervening media. The specific meaning of the above terms in the embodiments of the present application will be understood by those skilled in the art according to specific circumstances.

In the description of the embodiments of the present application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present application and to simplify the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the embodiments of the present application.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of implementations of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred example of the embodiment of the present application and is not intended to limit the embodiment of the present application, and various modifications and variations of the embodiment of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims (10)

1. An end cap assembly, comprising:

An end cap (31) having a mounting hole (311) therethrough;

The pole (32), the pole (32) comprises a columnar body (321) and a first flange (322) and a second flange (323) which are respectively connected with two ends of the columnar body (321) along the axial direction, the columnar body (321) passes through the mounting hole (311), and the first flange (322) and the second flange (323) are respectively positioned at two sides of the end cover (31) along the thickness direction;

Wherein the columnar body (321) comprises a reducing section (324), the side wall of the reducing section (324) is inclined relative to the axial direction of the columnar body (321), and at least part of the reducing section (324) is positioned in the mounting hole (311);

The sealing piece (33), the sealing piece (33) comprises a cylindrical body (331) and a first sealing part (332) connected to the first end of the cylindrical body (331) along the axial direction, the cylindrical body (331) is sleeved on the cylindrical body (321), and the first sealing part (332) is clamped between the first flange (322) and the end cover (31).

2. The end cap assembly of claim 1, wherein the sidewall of the reducing section (324) is inclined in a direction approaching a center line of the cylindrical body (321) in a direction in which the second flange (323) is directed toward the first flange (322).

3. The end cap assembly of claim 2, wherein an end face of the cylindrical body (321) adjacent the second flange (323) has a crush hole (325).

4. The end cap assembly of claim 3, wherein the outer edge of the second flange (323) has a plurality of notches (326) circumferentially spaced apart.

5. The end cap assembly of claim 4, wherein the notch (326) is V-shaped.

6. The end cap assembly of claim 1, wherein the seal member (33) further comprises a second seal portion (333), the second seal portion (333) being connected to the second end of the cylindrical body (331) in the axial direction and located between the second flange (323) and the end cap (31).

7. The end cap assembly of any of claims 1-6, wherein the end cap (31) comprises a cover plate (312) and a lower plastic (313);

the lower plastic (313) is located on one side of the cover plate (312) along the thickness direction, the mounting hole (311) penetrates through the cover plate (312) and the lower plastic (313), the first flange (322) is located on one side of the cover plate (312) away from the lower plastic (313), and the second flange (323) is located on one side of the lower plastic (313) away from the cover plate (312).

8. The end cap assembly of any of claims 1-6, wherein the end cap assembly (30) comprises an insulator (34), the insulator (34) comprising a spacer portion (341) and a wrap portion (342) each having a ring shape;

The isolation part (341) is located between the first flange (322) and the end cover (31), and is sleeved on the first sealing part (332), the wrapping part (342) is connected with the isolation part (341), and is located at one side, away from the end cover (31), of the isolation part (341), and at least part of the first flange (322) is located in an area surrounded by the wrapping part (342).

9. An energy storage device, comprising:

A housing (10) comprising a receiving chamber (11) having an opening;

An electrode assembly (20) accommodated in the accommodation chamber (11);

the end cap assembly (30) of any of claims 1-8, said end cap assembly (30) sealing an opening of said receiving cavity (11) and said post (32) being connected to said electrode assembly (20).

10. A powered device (400) comprising the energy storage device (100) of claim 9, the energy storage device (100) powering the powered device (400).