CN116799386B

CN116799386B - End cover assembly, energy storage device and electric equipment

Info

Publication number: CN116799386B
Application number: CN202311032218.0A
Authority: CN
Inventors: 李茂松
Original assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2023-12-26
Anticipated expiration: 2043-08-16
Also published as: CN116799386A

Abstract

End cover subassembly, energy memory and consumer, end cover subassembly includes: the top cover comprises an assembly hole, a first surface and a second surface, and the assembly hole penetrates through the first surface and the second surface; the upper plastic comprises a body and a first convex ring, and the outer peripheral surface of the first convex ring is abutted with the peripheral wall of the assembly hole; the pole comprises a flange part and a column part, the column part penetrates through the assembly hole and protrudes out of the second surface, and the outer peripheral surface of the column part is in butt joint with the inner peripheral surface of the first convex ring; the sealing member includes base member and a plurality of second bulge loop, the base member includes through-hole, third surface and fourth surface, cylinder portion outer peripheral face and the inner peripheral face butt of base member, third surface and fourth surface all are equipped with a plurality of second bulge loops, a plurality of second bulge loops all encircle the through-hole and arrange the setting along the radial of through-hole, have the clearance between two adjacent second bulge loops, a plurality of second bulge loops on third surface support in the surface of flange portion towards top cap one side, a plurality of second bulge loops on fourth surface support in the surface of first surface and first bulge loop towards flange portion one side.

Description

End cover assembly, energy storage device and electric equipment

Technical Field

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

Background

The secondary battery (Rechargeable battery) is also called a rechargeable battery or a storage battery, and is a battery that can be continuously used by activating an active material by charging after discharging the battery. 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 higher and higher, and particularly the requirement on the long service life performance of the battery is met. And the insulation and sealing properties between the post and the top cap often become key factors in determining the service life of the secondary battery.

In the technical field of existing energy storage devices, a pole and a top cover are generally insulated and sealed by using plastic parts; however, the plastic part has poor combination with the metal pole and the metal top cover, and the thermal expansion degree is different; in the long-term charge and discharge use process of the secondary battery, gaps are easily generated between the plastic part and the pole or the top cover due to temperature change, so that the sealing between the pole and the top cover is invalid to cause electrolyte leakage, and the service life of the secondary battery is reduced.

Disclosure of Invention

The application provides an end cover assembly, an energy storage device and electric equipment.

In a first aspect, embodiments of the present application provide an end cap assembly, the end cap assembly including a top cap, an upper plastic, a post, and a seal, the top cap including an assembly hole, a first surface, and a second surface, the first surface and the second surface being disposed opposite one another along an axial direction of the assembly hole, the assembly hole penetrating through the first surface and the second surface; the upper plastic comprises a body and a first convex ring, the body is arranged on the second surface, the first convex ring is arranged on the surface of the body facing to one side of the second surface, and the outer circumferential surface of the first convex ring is abutted with the circumferential wall of the assembly hole; the pole comprises a flange part and a column part protruding from the flange part, the column part penetrates through the assembly hole and protrudes from the second surface, the outer peripheral surface of the column part is abutted with the inner peripheral surface of the first convex ring, and the flange part is positioned on one side where the first surface is positioned; the sealing element comprises a base body and a plurality of second convex rings, wherein the base body comprises a through hole, a third surface and a fourth surface, the third surface and the fourth surface are oppositely arranged in the axial direction of the through hole, the outer peripheral surface of the column part is abutted to the inner peripheral surface of the base body, the third surface and the fourth surface are respectively provided with a plurality of second convex rings, the second convex rings surround the through hole and are radially distributed along the through hole, gaps are reserved between two adjacent second convex rings in the radial direction of the through hole, the second convex rings of the third surface are abutted to the surface of the flange part facing to the top cover side, and the second convex rings of the fourth surface are abutted to the first surface and the surface of the first convex ring facing to the flange part side.

In one possible embodiment, the surface of the second convex ring facing away from the base body in the axial direction of the through hole is an arc surface.

Through setting up the surface that deviates from base member one side in the axial of through-hole into the arc surface, fix the utmost point post with the top cap pressfitting, the second bulge loop receives along the axial extrusion force of through-hole, second bulge loop pressurized deformation forms the close joint face, the arc surface after receiving the extrusion all can grow with the area of first bulge loop and first surface butt to and the area of flange portion butt, increase sealing member and flange portion, and the area of contact between sealing member and last plastic and the top cap, promote the sealing performance of end cover subassembly. And in the radial direction of through-hole, have the clearance between two adjacent second bulge loops, when pressfitting utmost point post and top cap, the air that exists in the clearance between sealing member and top cap, the flange portion is compressed to the clearance between the second bulge loops, avoids appearing local stranded gas phenomenon between sealing member and top cap, the flange portion, avoids ageing influence sealing performance after the sealing member long-term use.

In a possible embodiment, the second convex ring extends along the axial direction of the through hole by a first height H1, and the first height H1 satisfies: h1 is more than or equal to 0.15mm and less than or equal to 0.35mm.

If the first height H1 of the second convex rings is smaller than 0.15mm, the gaps between the second convex rings become too small or even are full of the gaps after the second convex rings are compressed by compression deformation, so that the phenomenon of trapping air between the sealing element and the top cover and between the sealing element and the flange part occurs, and the sealing element is easy to age and reduce the sealing performance; if the first height H1 of the second convex rings is greater than 0.35mm, after the second convex rings are extruded due to the too high height, the second convex rings are easy to deviate from the axial direction of the through holes to incline towards the gaps between the second convex rings and then compress instead of deform and compress along the axial direction of the through holes, so that the inclined compressed second convex rings block the gaps between the second convex rings, and the sealing performance of the sealing element is affected. This application is through setting up the first height H1 of second bulge loop to more than or equal to 0.15mm and less than or equal to 0.35mm for the second bulge loop can be along the axial compression of through-hole after receiving the extrusion deformation, reduces or avoids the phenomenon of compression behind the clearance slope between the second bulge loop of second bulge loop orientation, ensures that the second bulge loop still has the clearance between two adjacent second bulge loops after receiving extrusion deformation compression, promotes the sealing performance of sealing member.

In a possible embodiment, the second convex ring has a first width W1 extending along the radial direction of the through hole, and the first width W1 satisfies: w1 is more than or equal to 0.10mm and less than or equal to 0.35mm.

If the first width W1 of the second convex ring is smaller than 0.10mm, the width of the second convex ring is too small, the contact area between the second convex ring and the flange part and between the second convex ring and the first surface and the first convex ring is too small, and the sealing performance of the sealing element is poor; if the first width W1 of the second convex rings is greater than 0.35mm, under the condition that the width of the sealing element is fixed and the number of the second convex rings distributed along the radial direction is the same, the gaps between the second convex rings can be reduced, and after the second convex rings are compressed by extrusion deformation, the gaps between the second convex rings can be correspondingly reduced, so that the gaps between the second convex rings are reduced, the phenomenon of trapping gas is easy to occur, and the sealing performance of the sealing element is affected poorly. The first width W1 of the second convex ring is set to be more than or equal to 0.10mm and less than or equal to 0.35mm, so that the second convex ring and the flange part and the second convex ring, the first surface and the first convex ring are ensured to have enough large contact area, and meanwhile, the gap between the second convex ring is ensured not to be too small, so that the sealing element still has good sealing performance under long-term use.

In a possible implementation manner, a plurality of annular protrusions are arranged on one side, close to the flange, of the outer peripheral surface of the column part, the annular protrusions are arranged at intervals in the axial direction of the column part, the annular protrusions are abutted to the inner peripheral surface of the base body, one annular protrusion, close to the flange, is arranged at intervals in the axial direction of the pole, an arc angle is formed at the joint of the flange and the column part, and the arc angle is located between one annular protrusion, close to the flange, and the flange.

The cylinder part is provided with a plurality of annular bulges at the abutting positions, when the sealing element is subjected to extrusion force along the axial direction of the through hole, the sealing element deforms along the radial direction of the through hole, and the outer peripheral surface of the base body is abutted with the surface of the annular bulge, which is away from the outer peripheral surface of the cylinder part, and the two side surfaces connected with the surface, so that the cylinder part is abutted with the inner peripheral surface of the base body in a larger area, and the sealing performance is further improved; and moreover, the plurality of annular bulges can be formed in one step by controlling the depth of the cutting tool bit when the column part is cut and milled, so that the processing steps are reduced, and the cost is reduced.

In a possible implementation manner, the sealing element further includes a third convex ring, the third surface and the fourth surface are both provided with the third convex ring, a plurality of second convex rings are located on one side, away from the inner peripheral surface of the base body, of the third convex ring in the radial direction of the through hole, the third convex ring abuts against the arc angle, a gap is formed between the third convex ring and the adjacent second convex ring, the second height of the third convex ring extending along the axial direction of the through hole is H2, and the second height H2 is greater than the first height H1 of the second convex ring extending along the axial direction of the through hole.

The pole is generally formed by mechanically rotating and cutting the whole aluminum block to form a column part and a flange part, a small arc angle transition is formed at the joint of the column part and the flange part after the cutting of a milling cutter, and when the sealing element is subjected to compressive force, the third convex ring is bent along the arc angle towards the side far from the column part and is tightly attached to the joint of the column part and the flange part to form a tight joint surface, so that the sealing effect between the sealing element and the pole is further improved; the third surface and the fourth surface are both provided with a third convex ring, so that a foolproof effect can be achieved, namely, the sealing effect can be improved by sleeving any surface of the sealing element on the pole.

In a possible embodiment, the inner circumferential surface of the third convex ring is flush with the inner circumferential surface of the base body, and a surface of the third convex ring facing away from the base body in the axial direction of the through hole is an arc surface.

When the pole and the top cover are pressed and fixed, the arc surface of the third convex ring is subjected to extrusion force in the axial direction of the through hole, so that the end part of the arc surface is deformed in the radial direction of the through hole and tightly abuts against the outer peripheral surface of the cylinder part, and the tightness between the sealing piece and the cylinder part is improved.

In a possible embodiment, the second height H2 satisfies: h2 is more than or equal to 0.25mm and less than or equal to 0.55mm.

If the second height H2 of the third convex ring is smaller than 0.25mm, the height of the third convex ring is too small, and the contact area between the third convex ring and the outer peripheral surface of the cylinder part is too small, so that the sealing performance between the sealing element and the cylinder part cannot be further improved; if the second height H2 of the third convex ring is greater than 0.55mm, after the third convex ring is extruded, the third convex ring is easy to deviate from the axial direction of the through hole to incline towards the gap between the second convex rings and then compress instead of compress along the axial deformation of the through hole, the third convex ring compressed after inclination cannot tightly prop against the outer circumferential surface of the cylinder part, the sealing performance between the sealing element and the cylinder part cannot be further improved, in addition, the second height H2 of the third convex ring is too high, so that the height difference between the third convex ring and the second convex ring is too large, and a large extrusion force needs to be applied to simultaneously extrude the third convex ring and the second convex ring. This application sets up the second height H2 of third bulge loop to be more than or equal to 0.25mm and less than or equal to 0.55mm for when the third bulge loop received the axial extrusion force along the through-hole, the area of contact between the outer peripheral face of third bulge loop and cylinder portion is big enough, further increases the area of contact between the inner peripheral face of sealing member and the outer peripheral face of cylinder portion, further promotes sealing performance between sealing member and the cylinder portion. In addition, avoid the difference in height between third bulge loop and the second bulge loop too big, reduce the pressure of pressfitting utmost point post and top cap, effectively promote the assembly efficiency of end cover subassembly.

In a possible embodiment, a second width of the third convex ring extending along the radial direction of the through hole is W2, and the second width W2 satisfies: w2 is more than or equal to 0.25mm and less than or equal to 0.45mm.

If the second width W2 of the third convex ring is smaller than 0.25mm, the width of the third convex ring is too thin, after the third convex ring is deformed and compressed by the extrusion force along the axial direction of the through hole, the third convex ring is easy to sink into a gap between the third convex ring and the second convex ring, so that the compressed third convex ring cannot be in close contact with the flange part, the first surface and the first convex ring, and the sealing effect is poor; if the second width W2 of the third convex ring is greater than 0.45mm, after the third convex ring is deformed and compressed by the extrusion force along the axial direction of the through hole, the area of the third convex ring along the radial direction of the through hole is increased, and the second height H2 of the third convex ring is higher than the first height H1 of the second convex ring, the third convex ring more easily blocks the gap between the third convex ring and the second convex ring, so that the phenomenon of partial trapping of air is easy to occur, and the sealing performance of the sealing piece cannot be further improved. This application sets up the second width W2 of third bulge loop to be more than or equal to 0.25mm and less than or equal to 0.45mm for after the third bulge loop receives along radial extrusion force deformation compression of through-hole, the third bulge loop is sunken to the possibility of clearance between third bulge loop and the second bulge loop reduce, make third bulge loop can with flange portion, first surface and first bulge loop in close contact with, and reduce or avoid the third bulge loop to block up the possibility of clearance between third bulge loop and the second bulge loop, effectively promote sealing member and flange portion, and sealing member and sealing performance between first surface and the first bulge loop.

In a possible implementation manner, the sealing element further includes a fourth convex ring and a fifth convex ring, the third surface and the fourth surface are respectively provided with the fourth convex ring and the fifth convex ring, the fourth convex ring is arranged on the inner edge of the base body and is obliquely arranged relative to the side wall of the base body, the fourth convex ring is abutted against the circular arc angle, the fifth convex ring is arranged on the outer edge of the base body and is obliquely arranged relative to the side wall of the base body, the inner edge of the base body and the outer edge of the base body are opposite in the radial direction of the through hole, and a plurality of second convex rings are arranged between the fourth convex ring and the fifth convex ring in the radial direction of the through hole, and gaps are respectively arranged between the fourth convex ring and the adjacent second convex ring, and between the fifth convex ring and the adjacent second convex ring.

The inner edge and the outer edge of the base body are respectively provided with a fourth convex ring and a fifth convex ring which are obliquely arranged, and when the pole column and the top cover are pressed together, the fourth convex ring and the fifth convex ring which are obliquely arranged are obliquely deformed to one side better, and the first surface, the first convex ring and the flange part are attached to each other, so that the sealing performance is improved; the bending direction of the fourth convex ring is opposite to that of the third convex ring, and the fourth convex ring can be bent and curled towards one side of the cylinder part along the arc angle of the joint of the cylinder part and the flange part to form a tight joint surface, so that the sealing performance is further improved.

In a possible embodiment, the third height of the fourth convex ring extending along the axial direction of the through hole is H3, the fourth height of the fifth convex ring extending along the axial direction of the through hole is H4, and both the third height H3 and the fourth height H4 are greater than the first height H1 of the second convex ring extending along the axial direction of the through hole.

The third height H3 of the fourth convex ring and the fourth height H4 of the fifth convex ring are higher than the first height H1 of the second convex ring, when the pole and the top cover are pressed, the fourth convex ring and the fifth convex ring are pressed and deformed to form a sealing surface, and are abutted to the first surface, the first convex ring and the flange part, and as the height difference is formed between the fourth convex ring and the second convex ring and between the fifth convex ring and the second convex ring, the fourth convex ring and the fifth convex ring are pressed, air between the sealing element and the top cover and between the fifth convex ring and the surface of the base body is compressed to the gaps between the fourth convex ring and the surface of the fifth convex ring after the second convex ring is pressed, and then the air between the sealing element and the top cover and between the flange part is compressed to the gaps between the second convex ring, the gaps between the second convex ring and the fourth convex ring and the gaps between the second convex ring and the fifth convex ring, so that aging of the sealing element is prevented from being influenced after the sealing element is used for a long time.

In a possible embodiment, the fourth collar is inclined toward the center of the through hole with respect to the inner peripheral surface of the base body, and the fifth collar is inclined toward a direction away from the center of the through hole with respect to the outer peripheral surface of the base body.

The fourth convex ring and the fifth convex ring are distributed in a horn shape, the fourth convex ring is subjected to extrusion force along the axial direction of the through hole, and as the inner peripheral surface of the base body is abutted with the outer peripheral surface of the cylinder part, the fourth convex ring is obliquely deformed along the radial direction of the through hole towards the center side of the through hole and is abutted on the outer peripheral surface of the cylinder part, and the fourth convex ring is not compressed into a gap between the fourth convex ring and the adjacent second convex ring, so that the sealing performance of the sealing element is improved; the fifth convex ring is subjected to extrusion force along the axial direction of the through hole, and the fifth convex ring is obliquely deformed along the radial direction of the through hole towards one side deviating from the center of the through hole, so that the fifth convex ring cannot be compressed into a gap between the fifth convex ring and the adjacent second convex ring, and the sealing performance of the sealing element is improved.

In one possible embodiment, the included angle between the fourth convex ring and the fourth surface and the included angle between the fifth convex ring and the fourth surface are both greater than or equal to 65 ° and less than or equal to 85 °.

If the included angle between the fourth convex ring and the fourth surface is smaller than 65 degrees, the inclined angle of the fourth convex ring is overlarge, the fourth convex ring is subjected to extrusion force along the axial direction of the through hole, the fourth convex ring deforms along the radial direction of the through hole, the fourth convex ring pushes the substrate away from the outer peripheral surface of the cylinder part, and the sealing performance between the cylinder part and the substrate is reduced; if the included angle between the fourth convex ring and the fourth surface is larger than 85 degrees, after the fourth convex ring receives extrusion force along the axial direction of the through hole, the fourth convex ring is easy to incline and deform towards one side of the second convex ring, and then the fourth convex ring is compressed into a gap between the fourth convex ring and the second convex ring, so that the sealing performance of the sealing piece is affected. According to the sealing device, the included angle between the fourth convex ring and the fourth surface is set to be more than or equal to 65 degrees and less than or equal to 85 degrees, when the fourth convex ring is prevented from deforming along the radial direction of the through hole, the substrate is pushed away from the outer peripheral surface of the cylindrical part, the outer peripheral surface of the cylindrical part and the inner peripheral surface of the substrate are always kept in a butt joint state, the sealing performance between the sealing element and the pole is guaranteed, meanwhile, the fourth convex ring is guaranteed to deform obliquely towards one side deviating from the gap between the fourth convex ring and the second convex ring, the gap is always reserved between the fourth convex ring and the adjacent second convex ring, and the sealing performance of the sealing element is improved.

If the included angle between the fifth convex ring and the fourth surface is smaller than 65 degrees, the inclined angle of the fifth convex ring is overlarge, and meanwhile, in order to ensure that the fourth height H4 of the fifth convex ring is larger than the first height H1 of the second convex ring, the distance of the fifth convex ring extending along the inclined direction needs to be correspondingly increased, so that more materials are consumed by the sealing element, and the manufacturing cost is increased; if the included angle between the fifth convex ring and the fourth surface is larger than 85 degrees, after the fifth convex ring receives extrusion force along the axial direction of the through hole, the fifth convex ring is easy to incline and deform towards one side of the second convex ring, so that the fifth convex ring is compressed into a gap between the fifth convex ring and the second convex ring, and the sealing performance of the sealing piece is affected. According to the sealing element, the included angle between the fifth convex ring and the fourth surface is more than or equal to 65 degrees and less than or equal to 85 degrees, so that the fact that the distance of the fifth convex ring extending along the inclined direction is overlarge is avoided, and the manufacturing cost of the sealing element is effectively reduced; and avoid the fifth bulge loop to incline to warp towards one side of the clearance between fifth bulge loop and the adjacent second bulge loop, guarantee that there is the clearance all the time between fifth bulge loop and the adjacent second bulge loop, promote the sealing performance of sealing member.

In a possible embodiment, a fifth height of the annular protrusion extending along the radial direction of the column portion is H5, and the fifth height H5 satisfies: h5 is more than or equal to 0.05mm and less than or equal to 0.25mm.

If the fifth height H5 of the annular bulge is smaller than 0.05mm, the height of the annular bulge is too small, and the processing difficulty of the annular bulge is increased when the outer peripheral surface of the column part is cut, milled and molded, so that the production efficiency is reduced; if the fifth height H5 of the annular protrusion is greater than 0.25mm, the height of the annular protrusion is excessively large, and after the inner circumferential surface of the base abuts against the plurality of annular protrusions, the gap between the base and the outer circumferential surface of the cylindrical portion is excessively large, and the sealing performance between the cylindrical portion and the sealing member is reduced. This application is through setting up annular bellied fifth high H5 to more than or equal to 0.05mm and less than or equal to 0.25mm, avoids annular bellied high too big or undersize, cuts when milling the annular protruding of formation at the outer peripheral face of cylinder portion, can effectively promote production efficiency, simultaneously, guarantees the leakproofness between sealing member and the cylinder portion.

In one possible implementation manner, a plurality of annular bosses are arranged at one end, close to the column portion, of the surface, facing the top cover, of the flange portion, the annular bosses are arranged at intervals in the radial direction of the column portion, and the annular bosses are abutted with a plurality of second convex rings on the third surface.

The butt position department of flange portion and sealing member sets up a plurality of annular boss, when the second bulge loop on the third surface received along the axial extrusion force of through-hole, the radial deformation of sealing member along the through-hole, can with the surface of deviating from flange portion one side of annular boss after the second bulge loop warp and with the equal butt of two sides that this surface links to each other, in addition, when the second bulge loop received along the axial extrusion force of through-hole, in the interval between two adjacent annular boss can partly be embedded to the second bulge loop for flange portion and sealing member form bigger area butt, the inside electrolyte of energy memory needs to go through longer, more circuitous runner just can leak out, further promote sealing performance between sealing member and the utmost point post.

In one possible implementation manner, a plurality of annular protrusions are arranged on one side, close to the flange, of the outer peripheral surface of the column part, a sixth height of the annular protrusions extending along the radial direction of the column part is H6, and the sixth height H6 meets: and H6 is more than or equal to 0.05mm and less than or equal to 0.15mm, wherein the sixth height H6 is less than or equal to the fifth height H5 of the annular protrusion extending along the radial direction of the column body.

The contact area of the flange part and the sealing element is larger than the contact area of the column part and the sealing element, the sixth height H6 of the annular boss on the flange part can be smaller than the fifth height H5 of the annular bulge on the outer peripheral surface of the column part, so that the contact area of the sealing element and the flange part and the contact area of the sealing element and the column part are kept as uniform as possible, the overall sealing performance of the sealing element is more uniform, the second convex ring is abutted with the two side surfaces of the two annular bosses and can be abutted with the bottom surface (the bottom surface is the surface of the flange part facing one side of the sealing element) of the interval between the two adjacent annular bosses, the contact area of the sealing element and the pole post after extrusion deformation is larger, and the flowing-out path of electrolyte between the pole post and the sealing element is longer.

In a possible implementation manner, a plurality of annular protrusions are arranged on one side, close to the flange, of the outer peripheral surface of the column part, a plurality of gaps are formed in each annular protrusion and each annular boss at equal intervals, the gaps on the two adjacent annular protrusions are arranged in a staggered manner along the axial direction of the column part, and the gaps on the two adjacent annular bosses are arranged in a staggered manner along the radial direction of the flange.

When the pole and the top cover are pressed, the sealing element is pressed and deformed to cover the plurality of annular protrusions on the pole part and the plurality of annular bosses on the flange part, gaps between the annular protrusions and gas in the gaps between the annular bosses can be discharged through the gaps, so that the phenomenon of trapping gas between the sealing element and the pole part and between the sealing element and the flange part is avoided, and the sealing performance between the sealing element and the pole part is improved. In addition, after the energy storage device is used for a period of time, the internal pressure of the energy storage device is increased, electrolyte is immersed from the gaps between the flange part and the lower plastic, and the distance from the electrolyte to the outside is increased.

In a second aspect, embodiments provide an energy storage device comprising a housing, an electrode assembly, and an end cap assembly according to the first aspect, the housing forming a receiving space, the receiving space having an opening; the electrode assembly is accommodated in the accommodating space; the end cover assembly covers the opening, the end cover assembly further comprises an adapter, and the electrode assembly is electrically connected with the pole through the adapter.

In a third aspect, an embodiment of the present application provides a powered device, where the powered device includes an energy storage device according to the second aspect, and the energy storage device is configured to supply power to the powered device.

In this end cover subassembly, energy memory and consumer, all be provided with a plurality of second bulge loops through on sealing member's third surface and fourth surface, the second bulge loop warp earlier when utmost point post and top cap press-fit, and the second bulge loop is softer than the base member in its less hardness of width, can laminate first surface, first bulge loop and flange portion towards the surface of top cap one side better, promotes sealing performance of sealing member. The gap is formed between two adjacent second convex rings, when the polar column and the top cover are pressed, air existing between the sealing element and the top cover and between the sealing element and the flange part is compressed into the gap between the second convex rings, so that the aging of the sealing element after long-term use caused by the local air trapping phenomenon is avoided, and the sealing performance of the sealing element is further effectively improved; in addition, in order to improve the product yield of the end cover assembly, the plastic is generally subjected to glue injection again through a heating mould so as to ensure the uniformity of the flow of the plastic in the mould, but the cooling and forming time of the plastic is prolonged; in order to improve the production efficiency of the end cover assembly, demolding is performed to accelerate the cooling of the upper plastic when the end cover assembly is not completely cooled; the third surface and the fourth surface of sealing member are located to a plurality of second bulge loops, the sum of the cross-sectional width that a plurality of second bulge loops cut along the plane that is on a parallel with the third surface is less than the cross-sectional width that the base member cut along the plane that is on a parallel with the third surface, when compressed, the second bulge loops only need less power will take place to deform and form laminating sealing butt face, sealing performance between top cap and the utmost point post has been promoted, and the resilience force after the sealing member has been compressed has been reduced to the second bulge loops, can effectively prevent the drawing of patterns back, pressure between flange portion and the top cap vanishes, the sealing member resilience will utmost point post prop away from the top cap, cause the cylinder portion of utmost point post to sink for the second surface of top cap, and then influence the welding effect of follow-up energy storage device and banket.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below.

Fig. 1 is a schematic diagram of an application scenario of an energy storage device according to an embodiment of the present application;

fig. 2 is a schematic perspective view of an energy storage device according to an embodiment of the present disclosure;

FIG. 3 is a schematic perspective exploded view of an end cap assembly according to an embodiment of the present application;

FIG. 4 is a schematic perspective view of a seal provided in an embodiment of the present application;

FIG. 5 is an enlarged schematic view of the seal shown in FIG. 4 at V;

FIG. 6 is a schematic cross-sectional view of the end cap assembly of the energy storage device of FIG. 2 taken along line VI-VI;

FIG. 7 is an enlarged schematic view of the end cap assembly VII of FIG. 6;

FIG. 8 is a schematic perspective view of a seal provided in an embodiment of the present application;

FIG. 9 is a schematic cross-sectional view of the seal shown in FIG. 8 along line IX-IX;

FIG. 10 is an enlarged schematic view of the seal shown in FIG. 9 at X;

FIG. 11 is a schematic perspective view of another seal provided in an embodiment of the present application;

FIG. 12 is a schematic cross-sectional view of the seal shown in FIG. 11 along line XII-XII;

FIG. 13 is an enlarged schematic view of the seal shown in FIG. 12 at XIII;

FIG. 14 is a schematic perspective view of yet another seal provided in an embodiment of the present application;

FIG. 15 is a schematic cross-sectional view of the seal shown in FIG. 14 along the XV-XV line;

FIG. 16 is an enlarged schematic view of the seal XVI shown in FIG. 15;

fig. 17 is a schematic perspective view of a pole according to an embodiment of the present disclosure;

FIG. 18 is an enlarged schematic view of the pole shown in FIG. 17 at XVIII;

FIG. 19 is an enlarged schematic view at XIX in FIG. 18;

fig. 20 is an enlarged schematic view at XX in fig. 18.

Reference numerals:

the energy storage device comprises a first height-H1, a first width-W1, a second height-H2, a second width-W2, a third height-H3, a fourth height-H4, a fifth height-H5, a sixth height-H6, an end cover assembly-10, a top cover-11, an assembly hole-111, a first surface-112, a second surface-113, a main body-114, an extension-115, an upper plastic-12, a main body-121, a first convex ring-122, a pole-13, a flange-131, a column-132, an annular protrusion-133, an annular boss-134, a notch-135, a sealing member-14, a base-141, a through hole-1411, a third surface-1412, a fourth surface-1413, a second convex ring-142, an arc surface-1421, a gap-143, a third convex ring-144, a fourth convex ring-145, a fifth convex ring-146, a transfer member-15, a housing-20, an opening-21, an electrode assembly-30, an energy storage device-100, an energy storage device-200, an electrical energy storage device-converting device-300, an energy storage device-400, and an energy storage device-converting device-300.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application.

The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments that can be used to practice the present application. Directional terms referred to herein, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are merely directions referring to the attached drawings, and thus, directional terms are used for better, more clear description and understanding of the present application, rather than indicating or implying that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the numbering of the components itself, e.g., "first," "second," etc., herein is merely used to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, the present solution provides an energy storage device 100, in which a group of chemical batteries are disposed in the energy storage device 100, and chemical elements in the chemical batteries are mainly used as energy storage media, and the charging and discharging process is accompanied with chemical reaction or change of the energy storage media, that is, the stored electric energy is released for use when the use of external electric energy reaches a peak, or is transferred to a place where the electric energy is short for reuse.

The present energy storage (i.e. energy storage) has a wide application scenario, including (wind and light) power generation side energy storage, power grid side energy storage, base station side energy storage, user side energy storage, etc., and the types of the corresponding energy storage device 100 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 small and medium energy storage electric cabinet is applied to industrial and commercial energy storage scenes (banks, markets and the like) at the user side, and the main operation mode is peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved.

As shown in fig. 1, the energy storage device 100 provided in the embodiment of the application is applied to an energy storage system 1000, where the energy storage system 1000 includes an electric energy conversion device 200 (photovoltaic panel), a wind energy conversion device 300 (fan), an electric device 400 (power grid), and the energy storage device 100, and the energy storage system 1000 further includes an energy storage cabinet, where the energy storage device 100 is installed in the energy storage cabinet, and may be installed outdoors. In particular, the photovoltaic panel may convert solar energy into electrical energy during periods of low electricity prices, and the energy storage device 100 may be used to store the electrical energy and supply the electrical grid during peak electricity prices, or to supply power during grid outages/outages. Wind energy conversion device 300 (wind turbine) may convert wind energy into electrical energy, and energy storage device 100 may be used to store the electrical energy and supply the electrical grid at peak electricity prices or when the electrical grid is powered off/down. The transmission of the electric energy can be performed by adopting a high-voltage cable.

The number of the energy storage devices 100 may be several, and the several energy storage devices 100 may be connected in series or parallel, and the several energy storage devices 100 may be supported by a separator (not shown) and electrically connected. In this embodiment, "a plurality of" means two or more. The energy storage device 100 may further be provided with an energy storage box for accommodating the energy storage device 100.

It is understood that the energy storage device 100 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, etc. The practical application form of the energy storage device 100 provided in the embodiment of the present application may be, but is not limited to, the listed products, and may be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 100. The embodiment of the present application will be described by taking the energy storage device 100 as a multi-core battery as an example.

Referring to fig. 2, the energy storage device 100 includes a case 20, an electrode assembly 30, and an end cap assembly 10 provided in the embodiment of the present application, where the case 20 is formed with a receiving space having an opening 21. The electrode assembly 30 is accommodated in the accommodating space, the end cover assembly 10 covers the opening 21, the end cover assembly 10 further comprises a switching piece 15, and the electrode assembly 30 is electrically connected with the pole 13 through the switching piece 15.

Referring to fig. 7, one end of the adapter 15 is connected to the electrode assembly 30, and the other end of the adapter 15 is connected to the flange 131 of the pole 13, so as to electrically connect the electrode assembly 30 and the pole 13.

It is understood that the energy storage system 1000 provided herein may also be a consumer energy storage system 1000.

The electric equipment 400 provided by the application comprises, but is not limited to, electric equipment 400 such as a power grid, a base station and the like.

Referring to fig. 3, 4 and 5, the end cap assembly 10 provided herein includes a top cap 11, an upper plastic 12, a pole 13 and a sealing member 14, wherein the top cap 11 includes a mounting hole 111, a first surface 112 and a second surface 113, the first surface 112 and the second surface 113 are disposed opposite to each other along an axial direction of the mounting hole 111, and the mounting hole 111 penetrates through the first surface 112 and the second surface 113; the upper plastic 12 comprises a body 121 and a first convex ring 122, the body 121 is mounted on the second surface 113, the first convex ring 122 is arranged on the surface of the body 121 facing the second surface 113, and the outer circumferential surface of the first convex ring 122 is abutted with the circumferential wall of the assembly hole 111; the pole 13 comprises a flange part 131 and a column part 132 protruding from the flange part 131, the column part 132 penetrates through the assembly hole 111 and protrudes from the second surface 113, the outer circumferential surface of the column part 132 is abutted against the inner circumferential surface of the first convex ring 122, and the flange part 131 is positioned on one side of the first surface 112; the seal 14 includes a base 141 and a plurality of second collars 142, the base 141 includes a through hole 1411, a third surface 1412 and a fourth surface 1413, the third surface 1412 and the fourth surface 1413 are disposed opposite to each other in an axial direction of the through hole 1411, an outer circumferential surface of the cylindrical portion 132 abuts against an inner circumferential surface of the base 141, the third surface 1412 and the fourth surface 1413 are each provided with a plurality of second collars 142, the plurality of second collars 142 each encircle the through hole 1411 and are disposed along a radial direction of the through hole 1411, a gap 143 is provided between two adjacent second collars 142 in a radial direction of the through hole 1411, the plurality of second collars 142 of the third surface 1412 abut against a surface of the flange portion 131 toward the top cover 11 side, and the plurality of second collars 142 of the fourth surface 1413 abut against the surfaces of the first surface 112 and the first collars 122 toward the flange portion 131 side.

The inner peripheral surface and the outer peripheral surface of a certain member referred to in the present application refer to two peripheral surfaces of the member that are opposite in the radial direction, for example, the inner peripheral surface of the base 141 is a peripheral surface of the side wall of the base 141 that faces the through hole 1411 side in the radial direction of the through hole 1411, and the outer peripheral surface of the base 141 is a peripheral surface of the side wall of the base 141 that faces away from the through hole 1411 side in the radial direction of the through hole 1411.

Please combine fig. 7, in the end cover assembly 10, the energy storage device 100 and the electric device 400 of the present application, through all being provided with a plurality of second convex rings 142 on the third surface 1412 and the fourth surface 1413 of the sealing member 14, the second convex rings 142 are deformed to form the tight junction surface when the pole 13 is pressed with the top cover 11, and compared with the substrate 141, the second convex rings 142 have smaller width and softer hardness, and can better fit the surfaces of the first surface 112, the first convex rings 122 and the flange 131 facing the top cover 11 side, so as to promote the sealing performance of the sealing member 14. And a gap 143 is formed between two adjacent second convex rings 142, when the pole 13 and the top cover 11 are pressed together, air existing between the sealing element 14 and the top cover 11 and between the sealing element and the flange 131 is compressed into the gap 143 between the second convex rings 142, so that the aging of the sealing element 14 after long-term use caused by the local air trapping phenomenon is avoided, and the sealing performance of the sealing element 14 is further effectively improved; in addition, in order to improve the product yield of the end cap assembly 10, the upper plastic 12 is generally heated and glue solution is injected again to ensure the uniformity of the flow of the upper plastic 12 in the mold, but this leads to longer cooling and molding time of the upper plastic 12, in order to improve the production efficiency of the end cap assembly 10, the cooling of the upper plastic 12 is accelerated by demolding after incomplete cooling, the plurality of second convex rings 142 are provided on the third surface 1412 and the fourth surface 1413 of the sealing member 14, and the sum of the cross-sectional widths (the widths are the widths extending along the radial direction of the through hole 1411) of the plurality of second convex rings 142 along the plane parallel to the third surface 1412 is smaller than the cross-sectional width of the base 141 along the plane parallel to the third surface 1412, so that when the base 141 is compressed, the second convex rings 142 are deformed with smaller force to form the attaching sealing abutment surface, thereby improving the sealing performance between the top cap 11 and the pole 13; and the second convex ring 142 reduces the resilience force of the compressed sealing member 14, so as to effectively prevent the pressure between the flange 131 and the top cover 11 from disappearing after demolding, and the resilience of the sealing member 14 supports the pole 13 away from the top cover 11, so that the column 132 of the pole 13 is sunk relative to the second surface 113 of the top cover 11, and further the welding effect of the subsequent energy storage device 100 and the tabs is affected.

It will be appreciated that the cylindrical portion 132 is protruding on the flange portion 131, and that the cylindrical portion 132 and the flange portion 131 may be sequentially disposed, and the flange portion 131 may be protruding on the outer periphery of the cylindrical portion 132 along a direction perpendicular to the arrangement direction of the cylindrical portion 132 and the flange portion 131 (i.e., the axial direction of the pole 13).

Wherein, the first convex ring 122 is positioned in the assembly hole 111 to ensure that the cylinder 132 is insulated from the top cover 11. The plurality of second convex rings 142 provided on the fourth surface 1413 are abutted against the surface of the first convex ring 122 facing the flange portion 131 side and the first surface 112 of the top cover 11.

Referring to fig. 6 and 7, the top cover 11 includes a main body 114 and an extension portion 115, the extension portion 115 is disposed on a side surface of the main body 114 facing the assembly hole 111 and is located at an end of the main body 114 away from the flange portion 131 in an axial direction of the assembly hole 111, a surface of the extension portion 115 facing away from the flange portion 131 is flush with the second surface 113, an outer circumferential surface of the first collar 122 abuts against an inner circumferential surface of the extension portion 115, and an outer circumferential surface of the base 141 abuts against an inner circumferential surface of the main body 114.

The first surface 112 is a surface of the extension portion 115 facing the flange portion 131, the second surface 113 is a surface of the main body 114 facing away from the flange portion 131, and the plurality of second convex rings 142 on the fourth surface 1413 are in contact with a surface of the first convex ring 122 facing the flange portion 131 and the first surface 112.

Referring to fig. 8, 9 and 10, the surface of the second collar 142 facing away from the base 141 in the axial direction of the through hole 1411 is illustratively an arc surface 1421.

By setting the surface of the second convex ring 142 on the side facing away from the base 141 in the axial direction of the through hole 1411 as an arc surface 1421, when the pole 13 is pressed and fixed with the top cover 11, the second convex ring 142 is pressed and deformed to form a tight contact surface along the axial direction of the through hole 1411, the contact area between the pressed arc surface 1421 and the first convex ring 122 and the first surface 112, and the contact area between the pressed arc surface 1421 and the flange 131 become larger, the contact area between the sealing element 14 and the flange 131, and the contact area between the sealing element 14 and the upper plastic 12 and the top cover 11 are increased, and the sealing performance of the end cover assembly 10 is improved. In the radial direction of the through hole 1411, a gap 143 is formed between two adjacent second convex rings 142, and when the pole 13 and the top cover 11 are pressed together, air in the gap 143 between the sealing element 14 and the top cover 11 and between the sealing element 14 and the flange 131 is compressed to the gap 143 between the second convex rings 142, so that the phenomenon of partial air trapping between the sealing element 14 and the top cover 11 and between the sealing element 14 and the flange 131 is avoided, and the sealing performance is prevented from being influenced by aging after the sealing element 14 is used for a long time.

Referring to fig. 10, the second convex ring 142 extends along the axial direction of the through hole 1411 by a first height H1, and the first height H1 satisfies: h1 is more than or equal to 0.15mm and less than or equal to 0.35mm.

The first height H1 may be 0.15mm, 0.17mm, 0.18mm, 0.20mm, 0.22mm, 0.25mm, 0.27mm, 0.30mm, 0.33mm, or 0.35mm, and the first height H1 may be any value in the range of 0.15mm or more and 0.35mm or less, which is not specifically mentioned herein.

If the first height H1 of the second convex rings 142 is less than 0.15mm, the gaps 143 between the second convex rings 142 become too small even full of the gaps 143 after the second convex rings 142 are compressed by compression deformation, resulting in air trapping between the sealing element 14 and the top cover 11 and between the sealing element 14 and the flange 131, and resulting in easy aging of the sealing element 14 and reduced sealing performance; if the first height H1 of the second convex rings 142 is greater than 0.35mm, the second convex rings 142 are easily inclined from the axial direction of the through holes 1411 toward the gaps 143 between the second convex rings 142 to compress instead of deforming and compressing along the axial direction of the through holes 1411 after the second convex rings 142 are extruded due to the excessively high height, so that the inclined compressed second convex rings 142 block the gaps 143 between the second convex rings 142, and the sealing performance of the sealing member 14 is affected. This application is through setting up the first height H1 of second bulge loop 142 to more than or equal to 0.15mm and less than or equal to 0.35mm for second bulge loop 142 can be along the axial compression of through-hole 1411 after receiving the extrusion deformation, reduces or avoids the phenomenon of compression behind the clearance 143 slope between the second bulge loop 142 of second bulge loop 142 towards second bulge loop 142, ensures that second bulge loop 142 receives extrusion deformation compression back, still has clearance 143 between two adjacent second bulge loops 142, promotes the sealing performance of sealing member 14.

Referring to fig. 10, for example, the second convex ring 142 extends along the radial direction of the through hole 1411 by a first width W1, and the first width W1 satisfies: w1 is more than or equal to 0.10mm and less than or equal to 0.35mm.

The first width W1 may be 0.10mm, 0.13mm, 0.16mm, 0.18mm, 0.20mm, 0.22mm, 0.25mm, 0.31mm, 0.33mm, or 0.35mm, and the first width W1 may be any value in the range of 0.10mm or more and 0.35mm or less, which is not specifically mentioned herein.

Referring to fig. 7, if the first width W1 of the second convex ring 142 is smaller than 0.10mm, the width of the second convex ring 142 is too small, the contact area between the second convex ring 142 and the flange 131, and the contact area between the second convex ring 142 and the first surface 112 and the first convex ring 122 are too small, and the sealing performance of the sealing member 14 is poor; if the first width W1 of the second convex rings 142 is greater than 0.35mm, the gaps 143 between the second convex rings 142 will be reduced when the width of the sealing element 14 is fixed and the number of the second convex rings 142 arranged along the radial direction is the same, and after the second convex rings 142 are compressed by extrusion deformation, the gaps 143 between the second convex rings 142 will be correspondingly reduced, so that the gaps 143 between the second convex rings 142 are reduced, which is easy to generate a trapping phenomenon and affects the sealing performance of the sealing element 14. In this application, the first width W1 of the second convex ring 142 is set to be greater than or equal to 0.10mm and less than or equal to 0.35mm, so as to ensure that a sufficient contact area exists between the second convex ring 142 and the flange portion 131, and between the second convex ring 142 and the first surface 112 and the first convex ring 122, and at the same time, ensure that the gap 143 between the second convex rings 142 is not too small, so that the sealing member 14 still has better sealing performance in long-term use.

Referring to fig. 17 and 18, for example, the outer peripheral surface of the cylindrical portion 132 is provided with a plurality of annular protrusions 133, the plurality of annular protrusions 133 are spaced apart in the axial direction of the cylindrical portion 132, and referring to fig. 7, the plurality of annular protrusions 133 are in contact with the inner peripheral surface of the base 141, an annular protrusion 133 near the flange portion 131 is spaced apart in the axial direction of the post 13 from the flange portion 131, the joint between the flange portion 131 and the cylindrical portion 132 has an arc angle, and a portion of the arc angle is located between the annular protrusion 133 near the flange portion 131 and the flange portion 131.

The annular protrusions 133 extend from the outer circumferential surface of the cylindrical portion 132 in the radial direction of the cylindrical portion 132, gaps 143 are formed in the axial direction of the cylindrical portion 132 in the same manner in the two adjacent annular protrusions 133, after the base 141 of the sealing member 14 receives the extrusion force in the axial direction of the through hole 1411, the base 141 deforms in the radial direction of the through hole 1411, air between the annular protrusions 133 and the base 141 is extruded into the gaps 143 between the annular protrusions 133, the air trapping phenomenon between the sealing member 14 and the pole 13 is avoided, and the sealing performance between the sealing member 14 and the pole 13 is improved.

The cylindrical portion 132 is provided with a plurality of annular protrusions 133 at the contact position with the sealing member 14, when the sealing member 14 receives the extrusion force along the axial direction of the through hole 1411, the sealing member 14 deforms along the radial direction of the through hole 1411, and after the outer peripheral surface of the base 141 deforms, the outer peripheral surface of the base 141 contacts with the surface of the annular protrusion 133, which is away from the outer peripheral surface of the cylindrical portion 132, and both side surfaces connected with the surface, so that the cylindrical portion 132 forms larger-area contact with the inner peripheral surface of the base 141, and the sealing performance is further improved; and, a plurality of annular protrusions 133 can be formed in one step by controlling the depth of the cutting tool bit when the cylinder portion 132 is cut and milled, so that the processing steps are reduced, and the cost is reduced.

Referring to fig. 19, for example, the fifth height of the annular protrusion 133 extending along the radial direction of the cylindrical portion 132 is H5, and the fifth height H5 satisfies: h5 is more than or equal to 0.05mm and less than or equal to 0.25mm.

The fifth height H5 may be 0.05mm, 0.06mm, 0.08mm, 0.10mm, 0.12mm, 0.15mm, 0.17mm, 0.21mm, 0.23mm, or 0.25mm, and the fifth height H5 may be any value in the range of 0.05mm or more and 0.25mm or less, which is not specifically mentioned herein.

If the fifth height H5 of the annular protrusion 133 is less than 0.05mm, the height of the annular protrusion 133 is too small, the processing difficulty of the annular protrusion 133 is increased when the outer circumferential surface of the cylindrical portion 132 is cut and milled, resulting in a decrease in production efficiency; if the fifth height H5 of the annular projection 133 is greater than 0.25mm, the height of the annular projection 133 becomes excessively large, and after the inner peripheral surface of the base 141 abuts against the plurality of annular projections 133, the gap between the base 141 and the outer peripheral surface of the cylindrical portion 132 becomes excessively large, and the sealing performance between the cylindrical portion 132 and the seal 14 is degraded. This application is through setting up the fifth high H5 of annular protruding 133 to be more than or equal to 0.05mm and less than or equal to 0.25mm, avoids annular protruding 133's height too big or undersize, cuts when milling the annular protruding 133 of formation at the outer peripheral face of cylinder portion 132, can effectively promote production efficiency, simultaneously, guarantees the leakproofness between sealing member 14 and the cylinder portion 132.

Referring to fig. 11, 12 and 13, by way of example, the seal 14 further includes a third collar 144, where each of the third surface 1412 and the fourth surface 1413 is provided with the third collar 144, and the plurality of second collars 142 are located on a side of the third collar 144 facing away from the inner peripheral surface of the base 141 in the radial direction of the through hole 1411, where the third collar 144 abuts against an arc angle (where the flange portion 131 and the cylindrical portion 132 are joined), and a gap 143 is provided between the third collar 144 and the adjacent second collar 142, where the second height H2 of the third collar 144 extending in the axial direction of the through hole 1411 is greater than the first height H1 of the second collar 142 extending in the axial direction of the through hole 1411.

The pole 13 is generally formed by mechanically rotating and cutting the whole aluminum block to form a column part 132 and a flange part 131, a small arc angle transition is formed at the joint of the column part 132 and the flange part 131 after the cutting of a milling cutter, and when the sealing element 14 is subjected to compressive force, the third convex ring 144 is bent along the arc angle towards the side far from the column part 132 along the radial direction of the through hole 1411 and is tightly attached to the joint of the column part 132 and the flange part 131 to form a sealing surface, so that the sealing effect between the sealing element 14 and the pole 13 is further improved; the third surface 1412 and the fourth surface 1413 are both provided with the third convex ring 144, which can play a role in foolproof, that is, the sealing effect can be improved by sleeving any surface (the third surface 1412 or the fourth surface 1413) of the sealing member 14 on the pole 13 towards the flange portion 131.

In the radial direction of the through hole 1411, the third convex ring 144 is closer to the inner peripheral surface of the base 141 than the plurality of second convex rings 142, and the second height H2 of the third convex ring 144 is greater than the first height H1 of the second convex ring 142, wherein, the inner peripheral surface of the base 141 is in contact with the outer peripheral surface of the cylinder 132, the contact area between the inner peripheral surface of the third convex ring 144 and the outer peripheral surface of the cylinder 132 is greater than the contact area between the second convex ring 142 and the outer peripheral surface of the cylinder 132, the third convex ring 144 far from the flange 131 side can be embedded between two adjacent annular protrusions 133 on the outer peripheral surface of the cylinder 132, the sealing member 14 forms a larger contact surface with the cylinder 132 after being extruded, and the electrolyte inside the energy storage device 100 needs to leak through a longer and more tortuous flow path, so that the sealing performance between the sealing member 14 and the cylinder 132 is further improved.

Illustratively, the inner peripheral surface of the third collar 144 is flush with the inner peripheral surface of the base 141, and the surface of the third collar 144 on the side facing away from the base 141 in the axial direction of the through hole 1411 is an arc surface 1421.

When the pole 13 and the top cover 11 are pressed and fixed, the circular arc surface 1421 of the third convex ring 144 is subjected to the pressing force along the axial direction of the through hole 1411, so that the end of the circular arc surface 1421 is deformed along the radial direction of the through hole 1411 and tightly abuts against the outer peripheral surface of the cylinder 132, and the tightness between the sealing element 14 and the cylinder 132 is improved.

Illustratively, the second height H2 satisfies: h2 is more than or equal to 0.25mm and less than or equal to 0.55mm.

The second height H2 may be 0.25mm, 0.27mm, 0.32mm, 0.35mm, 0.38mm, 0.42mm, 0.46mm, 0.50mm, 0.53mm, or 0.55mm, and the like, and the second height H2 may be any value in a range of 0.25mm or more and 0.55mm or less, wherein the value of the second height H2 is larger than that of the first height H1, which is not specifically mentioned herein.

If the second height H2 of the third convex ring 144 is less than 0.25mm, the height of the third convex ring 144 is too small, and the contact area between the third convex ring 144 and the outer circumferential surface of the cylindrical portion 132 is too small, so that the sealing performance between the sealing member 14 and the cylindrical portion 132 cannot be further improved; if the second height H2 of the third convex ring 144 is greater than 0.55mm, after the third convex ring 144 is extruded, the third convex ring 144 is easily inclined from the axial direction of the through hole 1411 toward the gap 143 between the second convex rings 142 and compressed instead of deformed and compressed along the axial direction of the through hole 1411, so that the third convex ring 144 compressed after inclination cannot tightly abut against the outer peripheral surface of the cylindrical portion 132, and cannot further improve the sealing performance between the sealing member 14 and the cylindrical portion 132, and in addition, too high second height H2 of the third convex ring 144 results in too large height difference between the third convex ring 144 and the second convex ring 142, so that a larger extrusion force needs to be applied to simultaneously extrude the third convex ring 144 and the second convex ring 142. The second height H2 of the third convex ring 144 is set to be greater than or equal to 0.25mm and less than or equal to 0.55mm, so that when the third convex ring 144 receives the extrusion force along the axial direction of the through hole 1411, the contact area between the third convex ring 144 and the outer circumferential surface of the cylinder portion 132 is large enough, the contact area between the inner circumferential surface of the sealing member 14 and the outer circumferential surface of the cylinder portion 132 is further increased, and the sealing performance between the sealing member 14 and the cylinder portion 132 is further improved. In addition, the excessive height difference between the third convex ring 144 and the second convex ring 142 is avoided, the pressure of the press-fit polar post 13 and the top cover 11 is reduced, and the assembly efficiency of the end cover assembly 10 is effectively improved.

The third convex ring 144 extends in the radial direction of the through hole 1411 by a second width W2, and the second width W2 satisfies: w2 is more than or equal to 0.25mm and less than or equal to 0.45mm.

The value of the second width W2 may be 0.25mm, 0.26mm, 0.28mm, 0.31mm, 0.34mm, 0.36mm, 0.38mm, 0.41mm, 0.43mm, or 0.45mm, and the like, and the value of the second width W2 may be any one of 0.25mm or more and 0.45mm or less, which is not particularly limited.

If the second width W2 of the third convex ring 144 is smaller than 0.25mm, the width of the third convex ring 144 is too thin, and after the third convex ring 144 is deformed and compressed by the extrusion force along the axial direction of the through hole 1411, the third convex ring 144 is easy to be recessed into the gap 143 between the third convex ring 144 and the second convex ring 142, so that the compressed third convex ring 144 cannot be in close contact with the flange 131, the first surface 112 and the first convex ring 122, and the sealing effect is poor; if the second width W2 of the third convex ring 144 is greater than 0.45mm, after the third convex ring 144 is deformed and compressed by the extrusion force along the axial direction of the through hole 1411, the area of the third convex ring 144 along the radial direction of the through hole 1411 increases, and the second height H2 of the third convex ring 144 is higher than the first height H1 of the second convex ring 142, the third convex ring 144 more easily blocks the gap 143 between the third convex ring 144 and the second convex ring 142, so that a local trapping phenomenon is easy to occur, and the sealing performance of the sealing member 14 cannot be further improved. The second width W2 of the third convex ring 144 is set to be greater than or equal to 0.25mm and less than or equal to 0.45mm, so that after the third convex ring 144 is compressed by the extrusion force deformation along the radial direction of the through hole 1411, the possibility that the third convex ring 144 is recessed into the gap 143 between the third convex ring 144 and the second convex ring 142 is reduced, the third convex ring 144 can be in close contact with the flange portion 131, the first surface 112 and the first convex ring 122, and the possibility that the third convex ring 144 blocks the gap 143 between the third convex ring 144 and the second convex ring 142 is reduced or avoided, so that the sealing performance between the sealing element 14 and the flange portion 131, and between the sealing element 14 and the first surface 112 and the first convex ring 122 is effectively improved.

Referring to fig. 14, 15 and 16, for example, the sealing member 14 may further include a fourth protrusion ring 145 and a fifth protrusion ring 146, wherein the third surface 1412 and the fourth surface 1413 are respectively provided with the fourth protrusion ring 145 and the fifth protrusion ring 146, the fourth protrusion ring 145 is disposed at an inner edge of the base 141 and is inclined with respect to a sidewall of the base 141, the fourth protrusion ring 145 is abutted against an arc angle (where the cylindrical portion 132 is joined to the flange portion 131), the fifth protrusion ring 146 is disposed at an outer edge of the base 141 and is inclined with respect to the sidewall of the base 141, an inner edge of the base 141 and an outer edge of the base 141 are opposite to each other in a radial direction of the through hole 1411, and a plurality of second protrusion rings 142 are disposed between the fourth protrusion ring 145 and the fifth protrusion ring 146 in the radial direction of the through hole 1411, and gaps 143 are respectively provided between the fourth protrusion ring 145 and the adjacent second protrusion ring 142, and between the fifth protrusion ring 146 and the adjacent second protrusion ring 142.

It will be appreciated that the fourth collar 145 may be used interchangeably with the third collar 144, i.e., in one embodiment, the second collar 142 and the third collar 144 are provided on the seal 14; in another embodiment, the sealing member 14 is provided with the second convex ring 142 and the fourth convex ring 145, which can achieve the effect of improving the sealing performance.

The fourth convex ring 145 and the fifth convex ring 146 which are obliquely arranged are respectively arranged on the inner edge and the outer edge of the base 141, and when the pole 13 and the top cover 11 are pressed together, the obliquely arranged fourth convex ring 145 and the obliquely arranged fifth convex ring 146 are better obliquely deformed to one side and are attached to the first surface 112, the first convex ring 122 and the flange part 131, so that the sealing performance is improved; the bending direction of the fourth convex ring 145 is opposite to that of the third convex ring 144, and the fourth convex ring can be bent and curled towards one side of the cylinder 132 along the arc angle of the joint of the cylinder 132 and the flange 131, so as to form a tight joint surface, and further improve the sealing performance.

Illustratively, the third height of the fourth collar 145 extending in the axial direction of the through-hole 1411 is H3, the fourth height of the fifth collar 146 extending in the axial direction of the through-hole 1411 is H4, and the third height H3 and the fourth height H4 are each greater than the first height H1 of the second collar 142 extending in the axial direction of the through-hole 1411.

When the pole 13 and the top cover 11 are pressed, the fourth convex ring 145 and the fifth convex ring 146 are pressed and deformed to form a sealing surface, and the sealing surface is abutted against the first surface 112, the first convex ring 122 and the flange 131, and the fourth convex ring 145 and the second convex ring 142, the fifth convex ring 146 and the second convex ring 142 have height differences, so that after the pressing of the fourth convex ring 145 and the fifth convex ring 146, air between the sealing element 14 and the top cover 11 and the flange 131 is compressed to a gap between the fourth convex ring 145, the fifth convex ring 146 and the surface of the base body 141, and after the pressing of the second convex ring 142, air between the sealing element 14 and the top cover 11 and the flange 131 is compressed to a gap 143 between the second convex ring 142 and the fourth convex ring 143, a gap 143 between the second convex ring 142 and the fourth convex ring 145, and a gap 143 between the fifth convex ring 142 and the flange 131, so that long-term aging of the sealing element 14 is prevented.

Illustratively, the fourth collar 145 is inclined toward the center of the through-hole 1411 with respect to the inner peripheral surface of the base 141, and the fifth collar 146 is inclined toward a direction away from the center of the through-hole 1411 with respect to the outer peripheral surface of the base 141.

The fourth convex ring 145 and the fifth convex ring 146 are distributed in a horn shape, the fourth convex ring 145 receives a pressing force along the axial direction of the through hole 1411, and as the inner peripheral surface of the base 141 abuts against the outer peripheral surface of the cylindrical portion 132, the fourth convex ring 145 is deformed obliquely along the radial direction of the through hole 1411 toward the center side of the through hole 1411 and abuts against the outer peripheral surface of the cylindrical portion 132 without being compressed into the gap 143 between the fourth convex ring 145 and the adjacent second convex ring 142, thereby improving the sealing performance of the sealing member 14; the fifth convex ring 146 receives a pressing force in the axial direction of the through hole 1411, and the fifth convex ring 146 is deformed obliquely in the radial direction of the through hole 1411 toward a side facing away from the center of the through hole 1411 without being compressed into the gap 143 between the fifth convex ring 146 and the adjacent second convex ring 142, improving the sealing performance of the seal 14.

Illustratively, the angle between the fourth convex ring 145 and the fourth surface 1413 and the angle between the fifth convex ring 146 and the fourth surface 1413 are both 65 ° or more and 85 ° or less.

As shown in fig. 16, the angle between the fourth convex ring 145 and the fourth surface 1413 is denoted as α1, and the angle between the fifth convex ring 146 and the fourth surface 1413 is denoted as α2.

The angle between the fourth convex ring 145 and the fourth surface 1413 may be 65 °, 67 °, 69 °, 72 °, 75 °, 78 °, 80 °, 82 °, 84 °, or 85 °, or the like, and the angle between the fourth convex ring 145 and the fourth surface 1413 may be any value in the range of 65 ° or more and 85 ° or less, which is not specifically described herein.

The fourth surface 1413 and the fifth surface are parallel to each other, and an included angle between the fifth convex ring 146 and the fourth surface 1413 is an included angle between the fifth convex ring 146 and the fifth surface. The angle between the fifth convex ring 146 and the fourth surface 1413 may be 65 °, 67 °, 69 °, 73 °, 75 °, 77 °, 80 °, 82 °, 84 °, 85 °, or the like, and the angle between the fifth convex ring 146 and the fourth surface 1413 may be any value in the range of 65 ° or more and 85 ° or less, which is not specifically described herein. The angle between the fifth convex ring 146 and the fourth surface 1413 may be equal to the angle between the fourth convex ring 145 and the fourth surface 1413.

If the included angle between the fourth convex ring 145 and the fourth surface 1413 is smaller than 65 °, the angle at which the fourth convex ring 145 is inclined is too large, the fourth convex ring 145 receives a pressing force along the axial direction of the through hole 1411, the fourth convex ring 145 deforms along the radial direction of the through hole 1411, and the fourth convex ring 145 pushes the base 141 away from the outer peripheral surface of the cylindrical portion 132, resulting in a decrease in sealing performance between the cylindrical portion 132 and the base 141; if the included angle between the fourth convex ring 145 and the fourth surface 1413 is greater than 85 °, the fourth convex ring 145 is easily deformed obliquely toward one side of the second convex ring 142 after the fourth convex ring 145 receives the pressing force along the axial direction of the through hole 1411, so that the fourth convex ring 145 is compressed into the gap 143 between the fourth convex ring 145 and the second convex ring 142, and the sealing performance of the sealing element 14 is affected. According to the sealing device, the included angle between the fourth convex ring 145 and the fourth surface 1413 is set to be more than or equal to 65 degrees and less than or equal to 85 degrees, when the fourth convex ring 145 is prevented from deforming along the radial direction of the through hole 1411, the matrix 141 is pushed away from the outer circumferential surface of the cylinder portion 132, the outer circumferential surface of the cylinder portion 132 and the inner circumferential surface of the matrix 141 are always kept in an abutting state, the sealing performance between the sealing element 14 and the pole 13 is guaranteed, meanwhile, the fourth convex ring 145 is guaranteed to be inclined and deformed towards one side deviating from the gap 143 between the fourth convex ring 145 and the second convex ring 142, the gap 143 is always reserved between the fourth convex ring 145 and the adjacent second convex ring 142, and the sealing performance of the sealing element 14 is improved.

If the included angle between the fifth convex ring 146 and the fourth surface 1413 is smaller than 65 °, the inclination angle of the fifth convex ring 146 is too large, and in order to ensure that the fourth height H4 of the fifth convex ring 146 is larger than the first height H1 of the second convex ring 142, the distance that the fifth convex ring 146 extends along the inclination direction needs to be correspondingly increased, which results in more material consumption of the sealing element 14 and increased manufacturing cost; if the included angle between the fifth convex ring 146 and the fourth surface 1413 is greater than 85 °, after the fifth convex ring 146 receives the pressing force along the axial direction of the through hole 1411, the fifth convex ring 146 is easily deformed obliquely toward one side of the second convex ring 142, so that the fifth convex ring 146 is compressed into the gap 143 between the fifth convex ring 146 and the second convex ring 142, and the sealing performance of the sealing element 14 is affected. In the method, the included angle between the fifth convex ring 146 and the fourth surface 1413 is more than or equal to 65 degrees and less than or equal to 85 degrees, so that the overlarge distance of the fifth convex ring 146 extending along the inclined direction is avoided, and the manufacturing cost of the sealing element 14 is effectively reduced; and avoid the fifth bulge loop 146 to incline and warp towards one side of the clearance 143 between the fifth bulge loop 146 and the adjacent second bulge loop 142, ensure that the clearance 143 exists between the fifth bulge loop 146 and the adjacent second bulge loop 142 all the time, promote the sealing performance of the sealing element 14.

Illustratively, the flange 131 has a plurality of annular bosses 134 disposed at an end of the flange facing the top cover 11 near the cylindrical portion 132, the plurality of annular bosses 134 being spaced apart in a radial direction of the cylindrical portion 132, and the plurality of annular bosses 134 abutting the plurality of second collars 142 on the third surface 1412.

The plurality of annular bosses 134 are arranged on the inner periphery of the surface of the flange 131 facing the top cover 11, so that the plurality of annular bosses 134 are closely attached to the second convex ring 142 on the sealing member 14; or a plurality of annular bosses 134 are in close apposition with second and third collars 142, 144 on the seal 14; or a plurality of annular bosses 134 are in close apposition with the second 142 and fourth 145 collars on the seal 14; or a plurality of annular bosses 134 are closely attached to the second, fourth and fifth collars 142, 145, 146 on the seal 14 to improve the sealing performance between the seal 14 and the pole 13.

The flange portion 131 and the sealing member 14 are provided with a plurality of annular bosses 134 at the abutting positions, when the second convex ring 142 on the third surface 1412 receives the extrusion force along the axial direction of the through hole 1411, the sealing member 14 deforms along the radial direction of the through hole 1411, the second convex ring 142 on the third surface 1412 abuts against the surface of the annular boss 134, which faces away from the flange portion 131, and two side surfaces connected with the surface after being deformed, in addition, when the second convex ring 142 receives the extrusion force along the axial direction of the through hole 1411, the second convex ring 142 is partially embedded into the interval between the two adjacent annular bosses 134, so that the flange portion 131 and the sealing member 14 form a larger-area abutting joint, electrolyte inside the energy storage device 100 needs to pass through a longer and more rounder flow passage to leak out, and sealing performance between the sealing member 14 and the pole 13 is further improved.

Referring to fig. 20, for example, a plurality of annular protrusions 133 are disposed on the outer peripheral surface of the cylindrical portion 132 near the flange portion 131, and the sixth height H6 of the annular protrusions 134 extending along the radial direction of the cylindrical portion 132 is H6, where the sixth height H6 satisfies: h6 is 0.05mm or less and 0.15mm or less, and the sixth height H6 is less than or equal to the fifth height H5 of the annular projection 133 extending in the radial direction of the cylindrical portion 132.

The sixth height H6 may be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, or 0.15mm, and the sixth height H6 may be any value in a range of 0.05mm or more and 0.15mm or less, wherein the value of the sixth height H6 may be smaller than the value of the fifth height H5, or may be equal to the value of the fifth height H5, which is not specifically mentioned herein.

The contact area between the flange portion 131 and the sealing member 14 is larger than the contact area between the cylindrical portion 132 and the sealing member 14, the sixth height H6 of the annular boss 134 on the flange portion 131 may be set smaller than the fifth height H5 of the annular boss 133 on the outer circumferential surface of the cylindrical portion 132, so that the contact area between the sealing member 14 and the flange portion 131 and the contact area between the sealing member 14 and the cylindrical portion 132 are kept as uniform as possible, the overall sealing performance of the sealing member 14 is more uniform, and the second convex ring 142 abuts against both side surfaces (the side surfaces are one surface of the annular boss 134 perpendicular to the radial direction of the through hole 1411) of the two annular bosses 134, the contact area between the sealing member 14 and the post 13 after extrusion deformation is larger, and the outflow path of electrolyte from between the post 13 and the sealing member 14 is longer.

For example, a plurality of annular protrusions 133 are disposed on the outer peripheral surface of the cylindrical portion 132 near the flange portion 131, a plurality of notches 135 are formed on each annular protrusion 133 and each annular protrusion 134 at equal intervals, the notches 135 on two adjacent annular protrusions 133 are disposed in a staggered manner along the axial direction of the cylindrical portion 132, and the notches 135 on two adjacent annular protrusions 134 are disposed in a staggered manner along the radial direction of the flange portion 131.

When the pole 13 and the top cover 11 are pressed, the sealing element 14 is pressed and deformed to cover the plurality of annular protrusions 133 on the column part 132 and the plurality of annular bosses 134 on the cover flange part 131, and gas in gaps between the annular protrusions 133 and gaps between the annular bosses 134 can be discharged through the gaps 135, so that the phenomenon of trapping gas between the sealing element 14 and the column part 132 and between the sealing element 14 and the flange part 131 is avoided, and the sealing performance between the sealing element 14 and the pole 13 is improved. In addition, when the energy storage device 100 is used for a period of time, the internal pressure of the energy storage device 100 increases, and the electrolyte is immersed from the gap between the flange 131 and the lower plastic, increasing the distance of penetration to the outside.

By way of example, the seal 14 may be made of rubber, silicone or other insulating material having elasticity; the second convex ring 142, the third convex ring 144, the fourth convex ring 145, and the fifth convex ring 146 may be integrally formed with the base 141.

The foregoing is a partial embodiment of the present application and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

Claims

1. An end cap assembly, comprising:

the top cover comprises an assembly hole, a first surface and a second surface, wherein the first surface and the second surface are oppositely arranged along the axial direction of the assembly hole, and the assembly hole penetrates through the first surface and the second surface;

the upper plastic comprises a body and a first convex ring, the body is arranged on the second surface, the first convex ring is arranged on the surface of the body, which faces to one side of the second surface, and the outer circumferential surface of the first convex ring is abutted with the circumferential wall of the assembly hole;

the pole comprises a flange part and a column part protruding from the flange part, the column part penetrates through the assembly hole and protrudes from the second surface, the outer circumferential surface of the column part is in butt joint with the inner circumferential surface of the first convex ring, and the flange part is positioned on one side where the first surface is positioned;

the sealing piece comprises a base body and a plurality of second convex rings, wherein the base body comprises a through hole, a third surface and a fourth surface, the third surface and the fourth surface are oppositely arranged in the axial direction of the through hole, the outer peripheral surface of the column part is abutted against the inner peripheral surface of the base body, the third surface and the fourth surface are respectively provided with a plurality of second convex rings, the second convex rings surround the through hole and are arranged along the radial direction of the through hole, gaps are reserved between two adjacent second convex rings in the radial direction of the through hole, the second convex rings of the third surface are abutted against the surface of the flange part facing one side of the top cover, and the second convex rings of the fourth surface are abutted against the surfaces of the first surface and the first convex rings facing one side of the flange part;

The outer peripheral surface of the column part is provided with a plurality of annular bulges close to one side of the column part, the annular bulges are arranged at intervals in the axial direction of the column part, the annular bulges are in abutting connection with the inner peripheral surface of the base body, one annular bulge close to the flange part is arranged at intervals in the axial direction of the pole column with the flange part, the joint of the flange part and the column part is provided with an arc angle, and the part of the arc angle is positioned between one annular bulge close to the flange part and the flange part; the sealing element further comprises a third convex ring, the third surface and the fourth surface are respectively provided with the third convex ring, a plurality of second convex rings are positioned on one side, deviating from the inner peripheral surface of the base body, of the third convex ring in the radial direction of the through hole, the third convex ring is propped against the arc angle, a gap is reserved between the third convex ring and the adjacent second convex ring, the second height, extending along the axial direction of the through hole, of the third convex ring is H2, and the second height H2 is larger than the first height, extending along the axial direction of the through hole, of the second convex ring.

2. The end cap assembly of claim 1, wherein a surface of the second collar on a side facing away from the base in an axial direction of the through hole is an arc surface.

3. The end cap assembly of claim 1, wherein the second collar extends in an axial direction of the through bore by a first height H1, the first height H1 satisfying: h1 is more than or equal to 0.15mm and less than or equal to 0.35mm.

4. The end cap assembly of claim 1, wherein the second collar extends radially of the through bore a first width W1, the first width W1 satisfying: w1 is more than or equal to 0.10mm and less than or equal to 0.35mm.

5. The end cap assembly of claim 1, wherein an inner peripheral surface of the third collar is flush with an inner peripheral surface of the base body, and a surface of the third collar on a side facing away from the base body in an axial direction of the through hole is an arc surface.

6. The end cap assembly of claim 1, wherein the second height H2 satisfies: h2 is more than or equal to 0.25mm and less than or equal to 0.55mm.

7. The end cap assembly of claim 1, wherein the third collar extends along a radial direction of the through bore a second width W2, the second width W2 satisfying: w2 is more than or equal to 0.25mm and less than or equal to 0.45mm.

8. The end cap assembly of claim 1, wherein the seal further comprises a fourth collar and a fifth collar, the third surface and the fourth surface each being provided with the fourth collar and the fifth collar, the fourth collar being disposed on an inner edge of the base and being disposed obliquely with respect to a sidewall of the base, the fourth collar being disposed against the circular arc angle, the fifth collar being disposed on an outer edge of the base and being disposed obliquely with respect to a sidewall of the base, an inner edge of the base and an outer edge of the base being opposite in a radial direction of the through hole, a plurality of the second collars being disposed between the fourth collar and the fifth collar in a radial direction of the through hole, the fourth collar and the adjacent second collar each having a gap therebetween, and the fifth collar and the adjacent second collar.

9. The end cap assembly of claim 8, wherein the fourth collar extends in the axial direction of the through bore a third height H3, the fifth collar extends in the axial direction of the through bore a fourth height H4, and both the third height H3 and the fourth height H4 are greater than the first height H1 of the second collar extending in the axial direction of the through bore.

10. The end cap assembly of claim 8, wherein the fourth collar is inclined toward the center of the through hole with respect to the inner peripheral surface of the base body, and the fifth collar is inclined toward a direction away from the center of the through hole with respect to the outer peripheral surface of the base body.

11. The end cap assembly of claim 10, wherein an included angle between the fourth collar and the fourth surface and an included angle between the fifth collar and the fourth surface are both 65 ° or more and 85 ° or less.

12. The end cap assembly of claim 1, wherein a fifth height of the annular protrusion extending radially of the cylindrical portion is H5, the fifth height H5 satisfying: h5 is more than or equal to 0.05mm and less than or equal to 0.25mm.

13. The end cap assembly of claim 1, wherein a surface of the flange portion facing the top cap side is provided with a plurality of annular bosses near one end of the cylindrical portion, the plurality of annular bosses being disposed at intervals in a radial direction of the cylindrical portion, the plurality of annular bosses abutting the plurality of second collars on the third surface.

14. The end cap assembly of claim 13, wherein the outer peripheral surface of the cylindrical portion is provided with a plurality of annular protrusions on a side thereof adjacent to the flange portion, the annular protrusions having a sixth height H6 extending in a radial direction of the cylindrical portion, the sixth height H6 satisfying: and H6 is more than or equal to 0.05mm and less than or equal to 0.15mm, wherein the sixth height H6 is less than or equal to the fifth height H5 of the annular protrusion extending along the radial direction of the column body.

15. The end cover assembly according to claim 13, wherein a plurality of annular protrusions are arranged on one side of the outer peripheral surface of the column body close to the flange portion, a plurality of gaps are formed in each annular protrusion and each annular boss at equal intervals, the gaps on the two adjacent annular protrusions are arranged in a staggered manner along the axial direction of the column body, and the gaps on the two adjacent annular bosses are arranged in a staggered manner along the radial direction of the flange portion.

16. An energy storage device, comprising:

a housing forming an accommodation space having an opening;

an electrode assembly accommodated in the accommodation space;

the end cap assembly of any one of claims 1-15, the end cap assembly covering the opening, the end cap assembly further comprising an adapter through which the electrode assembly is electrically connected to the pole.

17. A powered device comprising the energy storage device of claim 16, the energy storage device configured to power the powered device.