End cover assembly, energy storage device and electric equipment

Abstract

The utility model discloses an end cover assembly, an energy storage device and electric equipment, and relates to the technical field of energy storage. The end cover assembly comprises an end cover with a mounting hole; the pole comprises a columnar body, a first flange and a second flange, the columnar body comprises a variable-diameter section, the side wall of the variable-diameter section is inclined relative to the axial direction of the columnar body, and at least part of the variable-diameter section is located in the mounting hole; the sealing piece comprises a cylindrical body and a first sealing part, the cylindrical body is connected to the columnar body in a sleeving mode, and the first sealing part is arranged between the first flange and the end cover in a clamped mode. In the embodiment of the invention, at least part of the variable-diameter section on the cylindrical body is located in the mounting hole, so that inclined extrusion is formed on at least part of the cylindrical body through matching of the variable-diameter section and the hole wall of the mounting hole, namely, inclined sealing is formed between the cylindrical body and the hole wall of the mounting hole by the cylindrical body; therefore, the sealing reliability after the pole is assembled is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and more particularly, to an end cap assembly, an energy storage device, and an electrical device. Background Art

[0002] A secondary battery, also known as a rechargeable battery or a storage battery, refers to a battery that can be activated by charging after discharge and can be used continuously. The recyclable characteristics of secondary batteries have gradually made them the main power source of electrical devices. As the demand for secondary batteries increases, people have higher and higher requirements for their various performances, especially for the service life.

[0003] In related technologies, a secondary battery is usually composed of an end cap assembly, an electrode assembly, and a housing. In the actual production process, the end cap unit, the electrode assembly, and the housing are manufactured separately. Then, metal adapters are used to weld the pole columns of the end cap unit and the pole ears of the electrode assembly respectively. Then, the electrode assembly is placed into the housing, and after the end cap unit covers the opening of the housing, it is welded and sealed to form the basic structure of the secondary battery. After that, an artificial liquid injection method is adopted to inject electrolyte through the liquid injection hole provided on the end cap unit, and the liquid injection hole is welded and sealed after completion.

[0004] In related technologies, the end cap unit includes an end cap and a pole column. The pole column is disposed through the end cap, and the seal between the pole column and the end cap is achieved through a seal. However, in related technologies, the reliability of the seal between the pole column and the end cap cannot be effectively guaranteed. Summary of the Utility Model

[0005] A main object of the present application is to provide an end cap assembly, an energy storage device, and an electrical device that can improve the sealing reliability between the pole column and the end cap.

[0006] To achieve the above application objectives, the present application adopts the following technical solutions:

[0007] According to one aspect of the present application, there is provided an end cap assembly, including: an end cap having a through mounting hole; a pole column, the pole column including a columnar body and first and second flanges respectively connected to two axial ends of the columnar body, the columnar body passing through the mounting hole, the first and second flanges being respectively located on two sides of the end cap in the thickness direction; the columnar body includes a reduced-diameter section, the side wall of the reduced-diameter section is inclined relative to the axis of the columnar body, and at least a part of the reduced-diameter section is located in the mounting hole; a seal, the seal including a tubular body and a first sealing portion connected to a first axial end of the tubular body, the tubular body being sleeved on the columnar body, and the first sealing portion being clamped between the first flange and the end cap.

[0008] In the embodiment of the present application, through the first sealing portion included in the seal, the seal between the first flange and the end cover can be achieved, thereby realizing the seal between the pole column and the end cover in the thickness direction of the end cover; by arranging at least part of the reduced-diameter section of the columnar body inside the mounting hole, through the cooperation between the reduced-diameter section and the hole wall of the mounting hole, at least part of the cylindrical body is obliquely extruded, that is, at least part of the cylindrical body is extruded circumferentially and radially along the columnar body, so that the cylindrical body forms an oblique seal between the columnar body and the hole wall of the mounting hole. In this way, when the pole column deviates in the thickness direction relative to the end cover, although the first sealing portion between the first flange and the end cover fails to seal, due to the cooperation between the reduced-diameter section and the hole wall of the mounting hole, the oblique extrusion of at least part of the cylindrical body can still be achieved to ensure the sealing reliability of the pole column on the end cover.

[0009] According to an embodiment of the present application, in the direction in which the second flange points to the first flange, the side wall of the reduced-diameter section inclines towards the direction close to the center line of the columnar body.

[0010] According to an embodiment of the present application, an extrusion hole is provided on the end face of the columnar body close to the second flange.

[0011] In the embodiment of the present application, when extruding the pole column on the end face far from the first flange, through the arrangement of the extrusion hole, it is convenient to promote the expansion of the end far from the first flange of the pole column in the radial direction of the columnar body, that is, it is convenient to form a first reduced-diameter section close to the second flange on the columnar body.

[0012] According to an embodiment of the present application, a plurality of notches are distributed at intervals along the circumferential direction on the outer edge of the second flange.

[0013] In the embodiment of the present application, for the notches on the outer edge of the second flange, that is, before extruding the end face of the pole column far from the first flange, the end face edge of the pole column has notches, so that when extruding the pole column, it is convenient to reduce the resistance during extrusion and improve the extrusion effect on the pole column.

[0014] According to an embodiment of the present application, the notch is in a V shape.

[0015] According to an embodiment of the present application, the seal further includes a second sealing portion, and the second sealing portion is connected to the second end of the cylindrical body along the axial direction and is located between the second flange and the end cover.

[0016] In the embodiment of the present application, through the second sealing portion included in the seal, the seal between the second flange and the end cover can be achieved, thereby realizing the further seal between the pole column and the end cover in the thickness direction of the end cover and ensuring the insulation performance between the second flange and the end cover at the same time.

[0017] According to an embodiment of the present application, the end cover includes a cover plate and a lower plastic; the lower plastic is located on one side of the cover plate in the thickness direction, the mounting hole penetrates through the cover plate and the lower plastic, the first flange is located on the side of the cover plate facing away from the lower plastic, and the second flange is located on the side of the lower plastic facing away from the cover plate.

[0018] According to an embodiment of the present application, the end cover assembly includes an insulating member, and the insulating member includes an isolating portion and a wrapping portion that are both annular; the isolating portion is located between the first flange and the end cover, and is sleeved on the first sealing portion, the wrapping portion is connected to the isolating portion and is located on the side of the isolating portion away from the end cover, and at least a part of the first flange is located within the area surrounded by the wrapping portion.

[0019] In the embodiment of the present application, the gap between the first flange of the pole column and the end cover can be sealed simultaneously through the first sealing portion and the isolating portion, thereby increasing the sealing area and insulating area between the first flange and the end cover, so as to improve the sealing effect and insulating effect between the first flange and the end cover; at the same time, a receiving groove is formed by the wrapping portion, and then after the first flange is received in the receiving groove, the first flange is wrapped to ensure the insulating performance between the first flange and the end cover.

[0020] According to an aspect of the present application, there is provided an energy storage device, including: a housing including a receiving cavity having an opening; an electrode assembly received in the receiving cavity; the end cover assembly described in the above aspect, the end cover assembly seals the opening of the receiving cavity, and the pole column is connected to the electrode assembly.

[0021] According to an aspect of the present application, there is provided an electrical device, and the electrical device includes the energy storage device described in the above aspect, and the energy storage device supplies power to the electrical device.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By referring to the drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present application will become more obvious.

[0024] Figure 1 is a schematic diagram of an energy storage system shown according to an exemplary embodiment.

[0025] Figure 2 is a schematic cross-sectional structure diagram of an energy storage device shown according to an exemplary embodiment.

[0026] Figure 3It is an exploded structural schematic diagram of an end cap assembly shown according to an exemplary embodiment.

[0027] Figure 4 is Figure 3 a partially enlarged structural schematic diagram of the end cap assembly shown.

[0028] Figure 5 It is a sectional structural schematic diagram of another end cap assembly shown according to an exemplary embodiment.

[0029] Figure 6 It is a sectional structural schematic diagram in the assembly of an end cap assembly shown according to an exemplary embodiment.

[0030] Figure 7 is Figure 5 a partially enlarged structural schematic diagram of the end cap assembly shown.

[0031] Figure 8 is Figure 3 a partially enlarged structural schematic diagram of yet another end cap assembly shown.

[0032] Figure 9 It is a structural schematic diagram of an electrical device shown according to an exemplary embodiment.

[0033] Among them, the reference numerals are explained as follows:

[0034] 100, energy storage device; 200, power conversion device; 300, user load; 400, electrical device;

[0035] 10, housing; 20, electrode assembly; 30, end cap assembly; 40, metal adapter;

[0036] 11, accommodation cavity;

[0037] 31, end cap; 32, pole column; 33, seal; 34, insulating part;

[0038] 311, mounting hole; 312, cover plate; 313, lower plastic;

[0039] 321, columnar body; 322, first flange; 323, second flange; 324, reduced diameter section; 325, extrusion hole; 326, notch;

[0040] 331, cylindrical body; 332, first sealing part; 333, second sealing part;

[0041] 341, isolation part; 342, wrapping part. Detailed implementation manners

[0042] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed description will be omitted.

[0043] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the utilization rate, it is necessary to store one form of energy in the same form of energy or convert it into another form of energy through a medium or device, and then release it in a specific form of energy based on future applications.

[0044] Currently, green energy mainly includes light energy, wind energy, etc. However, problems such as strong intermittency and large volatility are common in light energy and wind energy, which can cause voltage instability in the green power grid (not enough electricity during peak electricity consumption and too much electricity during off-peak electricity consumption). Unstable voltage can damage the power, so the problem of "abandoning wind and light" may be caused due to insufficient electricity demand or insufficient grid acceptance capacity.

[0045] To solve the problems of insufficient electricity demand or insufficient grid acceptance capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electrical energy is converted into other forms of energy and stored by physical or chemical means, and the energy stored in the energy storage device is converted back into electrical energy and released when needed. Simply put, the energy storage device is similar to a large "portable power bank", which stores electrical energy when light energy and wind energy are sufficient and releases the stored electrical energy when needed.

[0046] Currently, the application scenarios of energy storage (i.e., energy storage) are relatively extensive, including power generation side energy storage, grid side energy storage, renewable energy grid connection energy storage, and user side energy storage, etc. The types of corresponding energy storage devices include:

[0047] (1) Large energy storage containers applied in the grid side energy storage scenario can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electrical energy in time and space, enhance the consumption capacity of renewable energy, and are of great significance in grid system standby, relieving the power supply pressure during peak loads, and peak shaving and frequency modulation.

[0048] (2) Medium and small-sized energy storage cabinets applied to industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side and household small-sized energy storage boxes applied to household energy storage scenarios on the user side mainly operate in the mode of "peak shaving and valley filling". Due to the large price difference in electricity charges at peak and valley positions according to electricity consumption demands, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage devices during the low electricity price period; during the high electricity price period, they then discharge the electricity in the energy storage devices for use, so as to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidences of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0049] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store electrical energy or supply electrical energy through the energy storage device.

[0050] Taking the household energy storage scenario in user-side energy storage as an example, Figure 1 The schematic diagram of an energy storage system provided by an embodiment of the present application is shown. The energy storage system includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), as well as a user load 300 (such as street lights, household appliances, etc.). The electric energy conversion device 200 is electrically connected to the energy storage device 100, and the energy storage device 100 is electrically connected to the user load 300. The energy storage device 100 is a small-sized energy storage box and can be installed on an outdoor wall in a wall-mounted manner. Specifically, the electric energy conversion device 200 can convert solar energy into electrical energy and store it through the energy storage device 100, and then supply it to the user load 300 for use during the peak electricity price period, or supply it to the user load 300 for use when the power grid is powered off / has a power outage.

[0051] Among them, the energy storage device 100 can be, but is not limited to, a single battery (secondary battery), as well as a battery module, a battery pack, a battery system, etc. composed of single batteries. The battery cell can 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 can be in the shape of a cylinder, a flat body, a cuboid, etc., and the embodiments of the present application do not limit this. Specifically, the battery cell can realize the charging and discharging process by using the chemical reaction or change of the energy storage medium (chemical element). Simply put, the electrical energy generated by light energy and wind energy is stored in the battery cell through the chemical reaction or change of the energy storage medium, and when the use of external electrical energy reaches the peak, the electrical energy stored in the battery cell is released for use through the chemical reaction or change of the energy storage medium, or transferred for use.

[0052] In some embodiments, such as Figure 2As shown, the energy storage device 100 includes: a housing 10, an electrode assembly 20, and an end cap assembly 30. The housing 10 has an open receiving cavity 11. The electrode assembly 20 is disposed in the receiving cavity 11, and the end cap assembly 30 seals the opening of the receiving cavity 11.

[0053] Among them, the housing 10 can be a cylindrical structure with one end open. At this time, the energy storage device 100 includes one end cap assembly 30 to be able to seal one opening of the housing 10. Of course, the housing 10 can also be a cylindrical structure with both ends open. At this time, the energy storage device 100 includes one end cap assembly 30 and one end cap 31, or includes two end cap assemblies 30. In this way, one end cap assembly 30 and one end cap 31, or two end cap assemblies 30 can respectively seal the two openings of the housing 10.

[0054] Among them, as Figure 2 shown, the end cap assembly 30 includes an end cap 31 and a pole post 32 passing through the end cap 31. The end cap 31 seals the opening of the housing 10. One end of the pole post 32 is connected to the electrode assembly 20, and the other end is exposed on the side of the end cap 31 away from the electrode assembly 20 to serve as an output terminal of the energy storage device 100.

[0055] Among them, the end cap 31 can only include a cover plate 312 (such as an insulating plate, etc.) to seal the opening on the housing 10 through the cover plate 312, or as Figure 2 shown, it includes a cover plate 312 (such as a light aluminum sheet, etc.) and a lower plastic 313. The cover plate 312 seals the opening of the housing 10, and the lower plastic 313 is located on the side of the cover plate 312 facing the electrode assembly 20 to achieve insulation between the electrode assembly 20 and the cover plate 312. In addition, an explosion-proof hole can be provided on the end cap 31, and the end cap assembly 30 includes an explosion-proof valve. The explosion-proof valve is installed in the explosion-proof hole to facilitate the gas generated when the energy storage device 100 is in thermal runaway to be discharged along the explosion-proof valve, reducing the risk of explosion of the energy storage device 100. Furthermore, a liquid injection hole can be provided on the end cap 31 to inject electrolyte into the receiving cavity 11 of the housing 10 along the liquid injection hole after the energy storage device 100 is assembled to achieve the infiltration of the electrode assembly 20.

[0056] Among them, the electrode assembly 20 includes a positive electrode plate, a negative electrode plate, and a separator stacked. The separator is located between the positive electrode plate and the negative electrode plate. The edges of the positive electrode plate and the negative electrode plate both have tabs to form the positive tab and the negative tab of the energy storage device 100. The positive tab and the negative tab can be located at the same end of the electrode assembly 20, or can be located at different ends of the electrode assembly 20. When the positive tab and the negative tab are located at the two ends of the electrode assembly 20, one of the positive tab and the negative tab is connected to the pole post 32 included in the end cap assembly 30, and the other is connected to the bottom of the housing 10 or the pole post 32 included in the other end cap assembly 30 for the output of electric energy.

[0057] It should be noted that, as Figure 2 shown, the energy storage device 100 may further include a metal adapter 40 to connect the electrode assembly 20 and the terminal 32 through the metal adapter 40, thereby ensuring the current-carrying capacity between the terminal 32 and the electrode assembly 20.

[0058] In the related art, for the end cap assembly 30 included in the energy storage device 100, when the terminal 32 is assembled on the end cap 31, only sealing in the thickness direction of the end cap 31 can be achieved. Thus, when the terminal 32 is offset in the thickness direction of the end cap 31, it is very easy to cause the sealing between the terminal 32 and the end cap 31 to fail, thereby bringing the risk of electrolyte leakage.

[0059] The embodiment of the present application provides an end cap assembly 30. When the terminal 32 included in the end cap assembly 30 is assembled on the end cap 31, it can not only form a seal in the thickness direction of the end cap 31, but also form a seal in the direction perpendicular to the thickness direction of the end cap 31, thereby effectively improving the sealing reliability between the terminal 32 and the end cap 31 and avoiding the risk of electrolyte leakage.

[0060] In some embodiments, as Figure 3 and Figure 4 shown, the end cap assembly 30 includes: an end cap 31, a terminal 32, and a seal 33. The end cap 31 has a through mounting hole 311; the terminal 32 includes a columnar body 321 and a first flange 322 and a second flange 323 respectively connected to both axial ends of the columnar body 321. The columnar body 321 passes through the mounting hole 311, and the first flange 322 and the second flange 323 are respectively located on both sides of the end cap 31 in the thickness direction; the seal 33 includes a cylindrical body 331 and a first sealing portion 332 connected to the first axial end of the cylindrical body 331. The cylindrical body 331 is sleeved on the columnar body 321, and the first sealing portion 332 is clamped between the first flange 322 and the end cap 31.

[0061] In addition, the distance between the side wall of at least a partial section of the columnar body 321 and the hole wall of the mounting hole 311 varies in the thickness direction of the end cap 31. In this way, through the first sealing portion 332 included in the seal 33, the seal between the first flange 322 and the end cap 31 can be achieved, so as to realize the seal between the pole column 32 and the end cap 31 in the thickness direction of the end cap 31; by setting the distance between the side wall of at least a partial section of the columnar body 321 and the hole wall of the mounting hole 311 to vary in the thickness direction of the end cap 31, at least a partial section of the side wall of the columnar body 321 has a certain inclination relative to the hole wall of the mounting hole 311, and further, the cylindrical body 331 included in the seal 33 can be squeezed in both the thickness direction of the end cap 31 and the direction perpendicular to the thickness of the end cap 31 (i.e., an oblique squeeze is formed on the cylindrical body 331), so as to realize the oblique seal of the cylindrical body 331 between the columnar body 321 and the hole wall of the mounting hole 311. In this way, when the pole column 32 is offset relative to the end cap 31 in the thickness direction of the end cap 31, although the first sealing portion 332 between the first flange 322 and the end cap 31 will fail to seal, due to the inclination of at least a partial section of the side wall of the columnar body 321 relative to the hole wall of the mounting hole 311, the cylindrical body 331 included in the seal 33 can still be squeezed, so as to ensure the reliability of the seal of the pole column 32 on the end cap 31.

[0062] Wherein, the wall thickness of the cylindrical body 331 is greater than or equal to the maximum distance between the side wall of the columnar body 321 and the hole wall of the mounting hole 311, so as to ensure that after the pole column 32 is assembled on the end cap 31, the cylindrical body 331 can be squeezed.

[0063] Wherein, the columnar body 321, the first flange 322, and the second flange 323 included in the pole column 32 are of an integral structure, and at least one of the first flange 322 and the second flange 323 is formed by extrusion on the end face of the pole column 32 after the pole column 32 passes through the mounting hole 311 on the end cap 31. At the same time, when the pole column 32 is extruded, the cylindrical body 331 included in the seal 33 can be squeezed through the deformation of the pole column 32, so as to improve the reliability of the seal of the cylindrical body 331. By way of example, in combination with Figure 5 and Figure 6As shown, before the pole 32 is assembled on the end cover 31, it only has the first flange 322. After the pole 32 passes through the mounting hole 311 on the end cover 31, the end surface of the pole 32 away from the first flange 322 is extruded to form the second flange 323. Of course, the columnar body 321 and the first flange 322 included in the pole 32 are an integral structure, and the second flange 323 is a structure formed by riveting. Specifically, the pole 32 includes a columnar body 321, a first flange 322 and a pressure block (riveted block). After the integrated structure including the columnar body 321 and the first flange 322 passes through the mounting hole 311 on the end cover 31, the pressure block is sleeved on the end of the columnar body 321 away from the first flange 322, and then the end surface of the columnar body 321 away from the first flange 322 is squeezed to fix the pressure block to the columnar body 321. At the same time, the second flange 323 is formed by the pressure block to realize the assembly of the pole 32 on the end cover 31.

[0064] The cylindrical body 331 and the first sealing portion 332 included in the seal 33 may be an integral structure, and the first sealing portion 332 may be pre-formed, or may be formed by assembling the pole 32 in the mounting hole 311, and deforming the seal 33 by extrusion of the first flange 322 and the end cover 31, and the embodiment of the present application does not limit this. The connection between the columnar body 321 and the first flange 322, the second flange 323, and the edge of the opening of the mounting hole 311 may be provided with a circular chamfer to prevent the seal 33 from being damaged due to stress concentration.

[0065] In addition, in combination with the above-mentioned situation that the end cover 31 includes a cover plate 312 and a lower plastic 313, the lower plastic 313 may be located on one side of the cover plate 312 along the thickness direction, the mounting hole 311 passes through the cover plate 312 and the lower plastic 313, the first flange 322 is located on the side of the cover plate 312 away from the lower plastic 313, and the second flange 323 is located on the side of the lower plastic 313 away from the cover plate 312.

[0066] In some embodiments, Figure 5 and Figure 7 As shown, the end cover assembly 30 includes an insulating member 34, and the insulating member 34 includes an isolating portion 341 and a wrapping portion 342, both of which are annular; the isolating portion 341 is located between the first flange 322 and the end cover 31, and is sleeved on the first sealing portion 332, the wrapping portion 342 is connected to the isolating portion 341, and is located on the side of the isolating portion 341 away from the end cover 31, and at least part of the first flange 322 is located in the area enclosed by the wrapping portion 342.

[0067] Among them, the first sealing portion 332 and the isolation portion 341 are both planar annular structures, and the 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 the gap between the first flange 322 of the terminal post 32 and the end cover 31, thereby increasing the sealing area and the insulation area between the first flange 322 and the end cover 31, so as to improve the sealing effect and the insulation effect between the first flange 322 and the end cover 31.

[0068] Among them, the wrapping portion 342 is a columnar annular structure, so that after being connected to the isolation portion 341, it can enclose a receiving groove, and then after the first flange 322 is received in the receiving groove, the first flange 322 can be wrapped to ensure the insulation performance between the first flange 322 and the end cover 31.

[0069] In the embodiment of the present application, in order to achieve the inclined sealing of the cylindrical body 331 between the columnar body 321 and the hole wall of the mounting hole 311, it can be as Figure 7 shown that the distance between the partial section of the columnar body 321 near the second flange 323 and the hole wall of the mounting hole 311 decreases in the direction close to the first flange 322; alternatively, the distance between the partial section of the columnar body 321 near the first flange 322 and the hole wall of the mounting hole 311 decreases in the direction close to the second flange 323; or, the distance between the partial section of the columnar body 321 near the second flange 323 and the hole wall of the mounting hole 311 decreases in the direction close to the first flange 322, and the distance between the partial section of the columnar body 321 near the first flange 322 and the hole wall of the mounting hole 311 decreases in the direction close to the second flange 323.

[0070] Among them, it may be that the hole wall of the mounting hole 311 has a stepped hole section, and / or the columnar body 321 has a stepped section 324. When the mounting hole 311 has a stepped hole section, the cross-sectional area perpendicular to the thickness direction of the end cover 31 on the stepped hole section changes along the thickness direction of the end cover 31, so as to realize the oblique extrusion of the cylindrical body 331 through the cooperation of the stepped hole section of the mounting hole 311 and the columnar body 321; when the columnar body 321 has a stepped section 324, the side wall of the stepped section 324 is inclined relative to the axial direction of the columnar body 321, that is, the cross-sectional area perpendicular to the thickness direction of the end cover 31 on the stepped section 324 changes along the thickness direction of the end cover 31, and at least part of the stepped section 324 is located in the mounting hole 311, so as to realize the oblique extrusion of at least part of the cylindrical body 331 through the cooperation of the stepped section 324 of the columnar body 321 and the hole wall of the mounting hole 311. In this way, when the pole column 32 is offset relative to the end cover 31 in the thickness direction, although the first sealing part 332 between the first flange 322 and the end cover 31 fails to seal, due to the cooperation between the stepped section 324 and the hole wall of the mounting hole 311, the oblique extrusion of at least part of the cylindrical body 331 can still be realized to ensure the sealing reliability of the pole column 32 on the end cover 31.

[0071] Next, the case where the columnar body 321 has a stepped section 324 will be taken as an example for explanation.

[0072] The stepped section 324 on the columnar body 321 can be formed after extrusion on the end face of the columnar body 321 far from the first flange 322, or can be formed after extrusion on the end face of the columnar body 321 far from the second flange 323.

[0073] In some embodiments, as Figure 5 and Figure 7 shown, in the direction from the second flange 323 to the first flange 322, the side wall of the stepped section 324 is inclined towards the center line of the columnar body 321.

[0074] Among them, the stepped section 324 is formed by liquid accumulation on the end face of the columnar body 321 far from the first flange 322. In this way, the distance between the part of the columnar body 321 close to the second flange 323 and the hole wall of the mounting hole 311 can be decreased in the direction close to the first flange 322, so that the part of the cylindrical body 331 included in the seal 33 sleeved on the stepped section 324 forms an oblique seal, thereby ensuring the sealing reliability of the pole column 32 and the end cover 31.

[0075] As described above, the second flange 323 included in the terminal post 32 may be formed by extruding the end face of the terminal post 32 away from the first flange 322. At this time, the end face of the terminal post 32 away from the first flange 322 may be a plane, that is, the end face of the columnar body 321 close to the second flange 323 is a plane; or the end face of the terminal post 32 away from the first flange 322 has an extrusion hole 325, that is, as Figure 6 or Figure 7 shown, the end face of the columnar body 321 close to the second flange 323 has an extrusion hole 325.

[0076] In this way, when extruding the terminal post 32 at the end face of the terminal post 32 away from the first flange 322, through the arrangement of the extrusion hole 325, it is convenient to promote the expansion of the end of the terminal post 32 away from the first flange 322 in the radial direction of the columnar body 321, that is, it is convenient to form a first reduced-diameter section 3241 close to the second flange 323 on the columnar body 321.

[0077] Among them, the shape of the extrusion hole 325 can be determined in combination with the shape of the extrusion tool. Exemplarily, the extrusion hole 325 can be a conical blind hole, a semi-elliptical blind hole, a hemispherical blind hole, etc. At this time, the extrusion tool has a columnar protrusion, or a conical protrusion, a semi-elliptical protrusion, a hemispherical protrusion, etc. with a larger size; or the extrusion hole 325 is a columnar blind hole, etc. At this time, the extrusion tool has a conical protrusion. And when the extrusion hole 325 is a conical blind hole, a semi-elliptical blind hole or a hemispherical blind hole, and the extrusion tool has a larger conical protrusion, a semi-elliptical protrusion or a hemispherical protrusion, it can increase the extrusion area of the terminal post 32, thereby facilitating the improvement of the assembly efficiency of the terminal post 32 on the end cover 31.

[0078] Optionally, as Figure 8 shown, the outer edge of the second flange 323 has a plurality of notches 326 distributed at intervals in the circumferential direction. In this way, for the notches 326 on the outer edge of the second flange 323, that is, before extruding the end face of the terminal post 32 away from the first flange 322, the end face edge of the terminal post 32 has notches 326, so that when extruding the terminal post 32, it is convenient to reduce the resistance during extrusion and improve the extrusion effect on the terminal post 32.

[0079] Among them, the notches 326 on the outer edge of the second flange 323 can be V-shaped, arc-shaped, etc. Of course, due to the uncontrollability of the deformation of the end of the terminal post 32 away from the first flange 322 during the extrusion of the terminal post 32, the notches 326 on the outer edge of the second flange 323 may also start to have other shapes, or other irregular notches 326, etc. The embodiments of the present application do not limit this.

[0080] In some embodiments, as Figure 5 and Figure 7As shown, the seal 33 includes a second seal portion 333. The second seal portion 333 is connected to the outer wall end of the cylindrical body 331 and is located between the second flange 323 and the end cap 31.

[0081] In this way, through the second seal portion 333 included in the seal 33, the seal between the second flange 323 and the end cap 31 can be achieved, so as to further seal the pole 32 and the end cap 31 in the thickness direction of the end cap 31, and at the same time, the insulation between the second flange 323 and the end cap 31 is achieved.

[0082] Among them, the second seal portion 333 and the cylindrical body 331 may be an integral structure, and the second seal portion 333 may be pre-made or formed synchronously with the deformation of the pole 32 when the pole 32 is extruded.

[0083] The embodiment of the present application also provides an electrical device 400, which may be a user energy storage cabinet, an energy storage container, etc. As Figure 9 shown, the electrical device 400 includes the energy storage device 100 described in the above embodiment, and the energy storage device 100 supplies power to the electrical device 400. In this way, as described above, during the use of the electrical device 400 of the present application, the stability of the operation of the electrical device 400 can be ensured.

[0084] In the embodiment of the present application, the terms "first", "second", and "third" are only used for the purpose of description and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiment of the present application can be understood according to specific circumstances.

[0085] In the description of the embodiment of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiment of the present application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation to the embodiment of the present application.

[0086] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the implementation manner of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0087] The above are only the preferred embodiments of the implementation manner of this application and are not used to limit the implementation manner of this application. For those skilled in the art, various changes and modifications can be made to the implementation manner of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the implementation manner of this application shall be included within the protection scope of the implementation manner of this application.

Claims

1. An end cap assembly, characterized in that: include: The end cover (31) has a penetrating mounting hole (311); A pole (32), the pole (32) comprising a columnar body (321) and a first flange (322) and a second flange (323) respectively connected to 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 located on two sides of the end cover (31) along the thickness direction; The columnar body (321) comprises a diameter-changing section (324), a side wall of the diameter-changing section (324) is inclined relative to the axial direction of the columnar body (321), and at least a portion of the diameter-changing section (324) is located in the mounting hole (311); A sealing member (33), the sealing member (33) comprising a cylindrical body (331) and a first sealing portion (332) connected to the first axial end of the cylindrical body (331), the cylindrical body (331) being sleeved on the columnar body (321), and the first sealing portion (332) being sandwiched between the first flange (322) and the end cover (31).

2. The end cap assembly according to claim 1, characterized in that In the direction from the second flange (323) to the first flange (322), the side wall of the diameter-changing section (324) is inclined toward a direction close to the center line of the columnar body (321).

3. The end cap assembly according to claim 2, wherein: An extrusion hole (325) is provided on the end surface of the columnar body (321) close to the second flange (323).

4. The end cap assembly according to claim 3, characterized in that: The outer edge of the second flange (323) has a plurality of notches (326) distributed at intervals along the circumferential direction.

5. The end cap assembly according to claim 4, characterized in that The notch (326) is V-shaped.

6. The end cap assembly according to claim 1, wherein: The sealing member (33) further comprises a second sealing portion (333), wherein the second sealing portion (333) is connected to the second end of the cylindrical body (331) along the axial direction and is located between the second flange (323) and the end cover (31).

7. The end cap assembly according to any one of claims 1 to 6, characterized in that: The end cover (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) passes through the cover plate (312) and the lower plastic (313), the first flange (322) is located on a side of the cover plate (312) away from the lower plastic (313), and the second flange (323) is located on a side of the lower plastic (313) away from the cover plate (312).

8. The end cap assembly according to any one of claims 1 to 6, characterized in that: The end cover assembly (30) comprises an insulating member (34), wherein the insulating member (34) comprises an isolating portion (341) and a wrapping portion (342) both of which are annular; The isolating portion (341) is located between the first flange (322) and the end cover (31), and is sleeved on the first sealing portion (332); the wrapping portion (342) is connected to the isolating portion (341) and is located on a side of the isolating portion (341) away from the end cover (31); at least a portion of the first flange (322) is located within the area enclosed by the wrapping portion (342).

9. An energy storage device, characterized in that: include: A housing (10) comprising a receiving chamber (11) having an opening; An electrode assembly (20) is accommodated in the accommodating cavity (11); The end cap assembly (30) according to any one of claims 1 to 8, wherein the end cap assembly (30) seals the opening of the accommodating cavity (11), and the pole (32) is connected to the electrode assembly (20).

10. An electrical device, characterized in that: The electrical device (400) comprises the energy storage device (100) according to claim 9, and the energy storage device (100) supplies power to the electrical device (400).

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