CN117543143B

CN117543143B - End cover assembly, energy storage device and electric equipment

Info

Publication number: CN117543143B
Application number: CN202410030217.0A
Authority: CN
Inventors: 金东明; 肖和攀
Original assignee: Shenzhen Haichen Energy Storage 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: 2024-01-09
Filing date: 2024-01-09
Publication date: 2024-04-09
Anticipated expiration: 2044-01-09
Also published as: CN117543143A

Abstract

The application discloses end cover subassembly, energy memory and consumer, end cover subassembly includes: the device comprises an end cover, a pole, an upper plastic, a sealing ring, a lower plastic and a pressing block, wherein the end cover comprises a first surface, a second surface, a mounting groove and a mounting hole, the mounting groove is concavely formed in the second surface, and the mounting hole penetrates through the groove bottom wall of the mounting groove and the first surface; the bottom wall of the mounting groove is convexly provided with a guide bulge, the guide bulge surrounds the mounting hole, and the guide bulge comprises a first guide surface; the lower plastic comprises an assembly hole, the assembly hole penetrates through two sides of the thickness direction of the lower plastic, the end cover and the lower plastic are arranged in a laminated mode, the guide protrusion is located in the assembly hole, and the hole wall of the assembly hole is arranged opposite to the first guide surface at intervals; the upper plastic is sleeved on the pole, penetrates through the mounting hole and the assembly hole with the pole, is positioned between the pole and the end cover, and the guide bulge is abutted with the upper plastic; the sealing ring is arranged in the mounting groove along the first guide surface and sleeved on the guide protrusion, the pressing block is sleeved on the pole, and the sealing ring is positioned between the pressing block and the end cover.

Description

End cover assembly, energy storage device and electric equipment

Technical Field

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

Background

As the demand for secondary energy storage devices increases, there is an increasing demand for energy density, reliability, manufacturing processes, and costs, particularly in the end cap portion. In the existing end cover structure, if the sealing ring cannot fall into a designated position in the assembly process, the tightness of the whole end cover structure can be reduced, and even the end cover can be scrapped, and the safety performance of the secondary energy storage device is affected.

Disclosure of Invention

The application provides an end cover subassembly, energy memory and consumer for the sealing washer can accurately fall into the assigned position in the assembly process, improves the leakproofness of end cover subassembly, has increased assembly yield and work efficiency, has also improved energy memory's installation performance.

The present application provides an end cap assembly for an energy storage device, the end cap assembly comprising: an end cover, a pole, an upper plastic, a sealing ring, a lower plastic and a pressing block,

the end cover comprises a first surface and a second surface, the first surface and the second surface are oppositely arranged along the thickness direction of the end cover, the end cover further comprises a mounting groove and a mounting hole, the mounting groove is concavely arranged on the second surface, and the mounting hole penetrates through the groove bottom wall of the mounting groove and the first surface;

The bottom wall of the mounting groove is convexly provided with a guide protrusion, the guide protrusion surrounds the mounting hole, the guide protrusion comprises a first guide surface, and the first guide surface faces to the side wall of the mounting groove along the direction from the center of the mounting hole to the side wall of the mounting groove;

the lower plastic comprises an assembly hole which penetrates through two surfaces of the lower plastic in the thickness direction,

the end cover and the lower plastic are arranged in a stacked mode along the thickness direction of the end cover assembly, the second surface faces the lower plastic, the mounting hole and the mounting hole are coaxially arranged, the guide protrusion is located in the mounting hole, and the hole wall of the mounting hole and the first guide surface are oppositely arranged at intervals;

the upper plastic is sleeved on the pole, penetrates through the mounting hole and the assembly hole with the pole, is positioned between the pole and the end cover, and is in butt joint with the upper plastic along the radial direction of the mounting hole; the sealing ring is arranged on the mounting groove along the first guide surface and sleeved on the guide protrusion,

the briquetting is adorned in lower plastic dorsad the one side of end cover, just the briquetting cover is located the utmost point post, along the thickness direction of end cover subassembly, the sealing washer is located the briquetting with between the end cover.

The sealing ring can seal gaps between the end cover and the lower plastic and the upper plastic, and can insulate the end cover from the pressing block. Moreover, the first guide surface can play a guide role in the installation of the sealing ring, so that the assembly precision of the sealing ring can be ensured, the sealing ring is prevented from being offset to be matched with the pole column for dislocation, the tightness of the end cover assembly is improved, the safety performance of the energy storage device is also improved, and the end cover and the pressing block can be completely insulated.

In one embodiment, a second guiding surface is formed on the wall of the assembly hole, the second guiding surface is opposite to the first guiding surface and forms a containing gap, and the sealing ring is installed in the containing gap along the second guiding surface and the first guiding surface.

The second guide surface and the first guide surface play a role in guiding the sealing ring together, so that the installation accuracy of the sealing ring is guaranteed, the sealing ring can be propped against together, the propping area is increased, and the sealing performance is improved.

In one embodiment, the upper plastic comprises a body and an extension part, wherein the extension part is connected with and protrudes out of one end of the body;

the sealing ring comprises a sealing ring body and a sealing flange, and the sealing flange is convexly arranged on the inner annular surface of the sealing ring body;

The upper plastic sleeve is sleeved on the pole, the extending part and the pole penetrate through the mounting hole and the assembly hole, and the guide protrusion is abutted with the extending part along the radial direction of the mounting hole; the end part of the extension part faces the pressing block along the thickness direction of the end cover assembly, and the guide protrusion and the pressing block press the sealing flange; and the sealing flange abuts the extension.

The sealing flange isolates the end cover and the pressing block, so that metal wires existing between the end cover and the pressing block fall into the end cover assembly to affect the battery cell of the energy storage device, the risk of short circuit between structural members in the end cover assembly is reduced, the sealing flange is directly abutted to the upper plastic, the insulating performance between the end cover and the pressing block is improved, and the safety performance of the energy storage device is enhanced.

In one embodiment, the sealing flange is located between the extension and the press block in a thickness direction of the end cap assembly, and the extension and the press block press the sealing flange.

The sealing flange isolates the end cover and the pressing block, so that metal wires existing between the end cover and the pressing block are prevented from falling into the end cover assembly to affect the battery cell of the energy storage device, the sealing path is increased, the path of outward permeation of electrolyte in the energy storage device can be prolonged, and the sealing performance is further improved.

In one embodiment, the sealing ring further comprises a convex ring, the convex ring is convexly arranged on the surface of the sealing flange, along the radial direction of the sealing ring, the convex ring is opposite to the sealing ring body at intervals and forms a gap, the guide protrusion is located in the gap, along the thickness direction of the end cover assembly, the end face of the convex ring, which is opposite to the sealing flange, is abutted to the end part of the pressing block, which is opposite to the extension part.

The sealing ring is provided with the convex ring and the gap, the convex ring is propped against the extending part of the upper plastic, the resistivity and the creepage distance between the end cover and the pole can be increased, and the pressure resistance between the end cover and the pole is improved. In addition, the guide protrusion is accommodated in the gap, so that a positioning effect is achieved when the sealing ring is installed, and the installation stability of the end cover assembly is improved.

In one embodiment, the first guide surface is an inclined surface or an arc surface, the second guide surface is an inclined surface or an arc surface, and the first guide surface and the second guide surface face the briquette.

The first guide surface and the second guide surface play a guide role in facing the sealing ring, so that the sealing ring is sleeved on the guide bulge and is positioned in the mounting groove.

In one embodiment, the seal ring includes an inner annular surface spaced opposite the first guide surface and an outer annular surface spaced opposite the second guide surface.

The inner ring surface and the first guide surface are opposite to each other at intervals to form a gap, the outer ring surface and the second guide surface are opposite to each other at intervals to form a gap, a space is provided for deformation of the sealing ring when the sealing ring is extruded, and the sealing path can be increased due to the fact that the first guide surface and the second guide surface are inclined surfaces, and sealing performance is improved.

In one embodiment, the pole comprises the step disposed around the periphery of the body;

the step comprises a step surface, the step surface faces away from the flange and is inclined towards the central axis direction of the main body;

the pressing block comprises a first upper surface and a first lower surface, and the first upper surface and the first lower surface are oppositely arranged along the thickness direction of the pressing block; the pressing block is sleeved on the pole, the first lower surface is abutted against the step surface, and the step surface is completely abutted against the first lower surface.

In the prior art, as the step surface of the pole is inclined clearly away from the axis of the pole, a larger gap exists at the connecting interface of the pressing block and the pole, and smoke generated in the welding process invades the end cover assembly from the gap and affects the safety performance of the energy storage device. The step surface on the step of utmost point post in this embodiment closely abuts with the first lower surface of briquetting, makes the step surface more inseparable with the first lower surface contact of briquetting to realize the compaction effect of briquetting to the utmost point post, eliminate the clearance between utmost point post and the briquetting, improve the connection leakproofness, avoided utmost point post and briquetting between smog invasion end cover and the briquetting that produces when the welding, promoted energy storage device's security.

In one embodiment, the pressing block is welded and fixed with the pole, the step surface is far away from the edge of the main body and deforms towards the flange, and the included angle between the step surface and the main body is 85-90 degrees.

In this embodiment, when the pole is not pressed by welding with the compact, the step surface is inclined in the direction of the central axis of the main body, that is, the outer periphery of the step surface is inclined in the direction of the inner periphery of the step surface. After the pole and the pressing block are welded and fixed, the pressing block extrudes the step surface to deform, so that the step surface is changed into a non-inclined surface, and an overlarge gap is avoided between the step surface and the pressing block. And the deformation lines are generated after the step surface is deformed.

In one embodiment, the pole comprises a flange and a body connected to a surface of one side of the flange in a height direction of the pole,

the pole comprises a metal part and a second metal part, the metal part covers one side of the second metal part, which is opposite to the flange of the pole, and the step is formed on the metal part; the metal part and the second metal part are formed by stamping, the metal part is made of copper materials, and the second metal part is made of aluminum materials.

The pole can be of a copper-aluminum composite structure manufactured through a stamping process, the processing process is simple, the preparation efficiency is improved, and the manufacturing cost of the pole can be effectively reduced.

In one embodiment, the lower plastic comprises a third surface and a fourth surface, the third surface and the fourth surface are oppositely arranged along the thickness direction of the lower plastic, the lower plastic further comprises an avoidance groove, the avoidance groove is recessed from the fourth surface towards the direction of the third surface and protrudes out of the third surface to form a boss,

the avoidance groove comprises a bottom wall and a side wall, the side wall surrounds the periphery of the bottom wall and is connected with the bottom wall, and the assembly hole penetrates through the bottom wall; the pressing block is positioned in the avoidance groove, and the boss is positioned in the mounting groove;

the side wall of the mounting groove is provided with a clamping piece; the boss outside is equipped with the buckle, the fastener with the buckle card is held.

The application provides an energy storage device, which comprises a shell, an electric core and an end cover assembly, wherein the shell comprises an opening and a containing cavity, the electric core is contained in the shell, the end cover assembly is sealed in the opening,

the battery cell comprises a tab, and the tab is connected with the pole.

The application provides electric equipment, it includes energy storage device, energy storage device is used for the electric equipment power supply.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without the inventive effort.

Fig. 1 is an application scenario diagram of an energy storage device provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of the energy storage device shown in FIG. 1;

FIG. 3 is a schematic illustration of the end cap assembly of the energy storage device of FIG. 2;

FIG. 4 is a schematic view of an alternative angle of the end cap assembly of the energy storage device of FIG. 2;

FIG. 5 is an exploded view of the end cap assembly of FIG. 3;

FIG. 6 is a schematic view of an alternative angular exploded construction of the end cap assembly of FIG. 3;

FIG. 7A is a schematic view of the first pole of the end cap assembly of FIG. 5;

FIG. 7B is a schematic cross-sectional view of the first pole shown in FIG. 7A;

FIG. 8A is a schematic view of a second post of the end cap assembly of FIG. 5;

FIG. 8B is a schematic cross-sectional view of the second post shown in FIG. 8A;

FIG. 9A is a schematic cross-sectional view of a first upper plastic of the end cap assembly of FIG. 5;

FIG. 9B is a schematic cross-sectional view of a second upper plastic of the end cap assembly of FIG. 5;

FIG. 10 is a schematic cross-sectional view of an end cap of the end cap assembly shown in FIG. 5;

FIG. 11A is a schematic cross-sectional view of a first embodiment of a first seal ring of the end cap assembly of FIG. 5;

FIG. 11B is a schematic cross-sectional view of a first embodiment of a second seal ring of the end cap assembly shown in FIG. 5;

FIG. 12A is a schematic cross-sectional view of a second embodiment of a first seal ring of the end cap assembly shown in FIG. 5;

FIG. 12B is a schematic cross-sectional view of a second embodiment of a second seal ring of the end cap assembly shown in FIG. 5;

FIG. 13 is a schematic view of the lower plastic of the end cap assembly of FIG. 5;

FIG. 14 is a schematic cross-sectional view of the lower plastic of FIG. 13 taken along the line N-N;

FIG. 15A is a schematic cross-sectional view of a portion of the structure of the first embodiment of the end cap assembly shown in FIG. 3 taken along M-M;

FIG. 15B is a schematic cross-sectional view of another portion of the structure of the first embodiment of the end cap assembly shown in FIG. 3 taken along M-M;

FIG. 16 is a schematic cross-sectional view of the second embodiment of the end cap assembly shown in FIG. 3, taken along M-M;

FIG. 17 is a schematic cross-sectional view of the third embodiment of the end cap assembly shown in FIG. 3, taken along line M-M.

The corresponding nouns of the reference numerals in the figures are: the energy storage device 1000, the case 800, the end cap assembly 100, the end cap 10, the first surface 11, the second surface 12, the first mounting groove 13, the first groove sidewall 131, the first groove bottom wall 132, the first snap 133, the second mounting groove 14, the second groove sidewall 141, the second groove bottom wall 142, the second snap 143, the first mounting hole 15, the second mounting hole 16, the first guide protrusion 17, the first guide surface 171, the second guide surface 181, the second guide protrusion 18, the first post 21, the first flange 211, the first face 2111, the second face 2112, the first body 212, the first step 213, the first step face 2131, the first metal portion 214, the second metal portion 215, the second post 22, the second flange 221, the third face 2211, the fourth face 2212, the second body 222, the second step 223, the second step face 2231, the first upper plastic 31, the first body 311, the first segment 314, the second segment, the first mounting face 3151 second mounting face 3152, first extension 312, first through hole 313, second upper plastic 32, second body 321, third section 324, fourth section 325, third mounting face 3251, fourth mounting face 3252, second extension 322, second through hole 323, first seal ring 41, first seal ring body 410, first insulating face 411, second insulating face 412, first inner annular face 413, first seal hole 414, first seal flange 415, first collar 416, first top face 4161, first side 4162, second side 4163, first void 417, second seal ring 42, third insulating face 421, fourth insulating face 422, second inner annular face 423, second seal hole 424, second seal flange 425, second collar 426, second top face 4261, third side 4262, fourth side 4263, second void 427, lower plastic 50, plastic body 51, third surface 511, fourth surface 512, first snap 513, second snap 514, the first avoidance groove 52, the first bottom wall 521, the first side wall 522, the second avoidance groove 53, the second bottom wall 531, the second side wall 532, the first boss 54, the first boss 541, the first boss side 542, the second boss 55, the second boss 551, the second boss side 552, the first assembly hole 56, the third guide surface 561, the second assembly hole 57, the fourth guide surface 571, the first press block 61, the first upper surface 611, the first lower surface 612, the first post through hole 613, the second press block 62, the second upper surface 621, the second lower surface 622, the second post through hole 623, the first accommodation gap a, the second accommodation gap B, the second powered device 2000, the first powered device 3000, the first power conversion device 4100, the second power conversion device 4200, and the energy storage system 5000.

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, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being either fixedly connected, detachably connected, or as being integral; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly, or indirectly, through intermediaries, or both, may be in communication with each other, or may be in interaction with each other, unless specifically defined otherwise.

It should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

Taking electrochemical energy storage as an example, the present solution provides an energy storage device 1000, in which a group of chemical batteries are disposed in the energy storage device 1000, 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) application scenario is wider, including aspects such as (wind and light) power generation side energy storage, electric wire netting side energy storage, base station side energy storage and user side energy storage, the kind of the corresponding energy storage device 1000 includes:

(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.

It should be noted that, the above-mentioned devices including the energy storage device 1000, such as the energy storage container, the small and medium-sized energy storage electric cabinet, and the small-sized energy storage box for a user, may be understood as electric devices.

Referring to fig. 1, fig. 1 is an application scenario diagram of an energy storage device according to an embodiment of the present application.

The energy storage device 1000 provided in the embodiment of the present application is applied to an energy storage system 5000, where the energy storage system 5000 includes a first electric energy conversion device 4100 (photovoltaic panel), a second electric energy conversion device 4200 (fan), a first electric device 3000 (power grid), a second electric device 2000 (base station), and the energy storage device 1000. The energy storage system 5000 further includes an energy storage cabinet, the energy storage device 1000 is installed in the energy storage cabinet, and the energy storage cabinet may be installed outdoors. Specifically, the first power conversion device 4100 may convert solar energy into electric energy during the low electricity price period, and the energy storage device 1000 is configured to store the electric energy and supply the electric energy to the first electric device 3000 or the second electric device 2000 during the peak electricity consumption period, or supply the electric energy when the first electric device 3000 or the second electric device 2000 is powered off/powered off. Second power conversion device 4200 may convert wind energy into electrical energy, and energy storage device 1000 may be configured to store the electrical energy and supply power to first powered device 3000 or second powered device 2000 during peak power usage, or to power first powered device 3000 or second powered device 2000 during power outage/power outage. The transmission of the electric energy can be performed by adopting a high-voltage cable.

It should be noted that, the devices including the energy storage device 1000, such as the first powered device 3000 and the second powered device 2000, may be understood as powered devices.

Referring to fig. 2, fig. 2 is a schematic structural diagram of the energy storage device shown in fig. 1.

The energy storage device 1000 may include, but is not limited to, a single battery, a battery module, a battery pack, a battery system, etc., and it is understood that the practical application of the energy storage device 1000 provided in the present application may be, but is not limited to, the listed products, and may also be other application forms. For example, the energy storage device 1000 may be a secondary battery such as a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid (or lead-storage) battery, a lithium ion battery, or a polymer lithium ion battery. When the energy storage device 1000 is a single cell, it may be a cylindrical cell, a prismatic cell, or a cell of other shapes. In this embodiment, the energy storage device 1000 is a square battery. Wherein, square battery is the secondary cell.

The energy storage device 1000 includes an end cap assembly 100, a housing 800, and a battery cell (not shown). The housing 800 includes an opening (not shown) and a receiving chamber (not shown). The cell includes a positive tab (not shown) and a negative tab (not shown). The end cap assembly 100 includes a second pole 22 and a first pole 21. When the energy storage device 1000 is assembled, the positive electrode lug is welded with the second electrode post 22, the negative electrode lug is welded with the first electrode post 21, then the battery cell is placed in the accommodating cavity of the shell 800, the end cover assembly 100 is sealed at the opening of the shell 800, a semi-finished battery is assembled, and the energy storage device 1000 is obtained through a series of procedures of liquid injection, and the like. The specific structure of the energy storage device 1000 is not limited in this application.

For convenience of description, in this application, a thickness direction of the energy storage device 1000 is defined as a Z-axis direction, a width direction is defined as an X-axis direction, and a length direction is defined as a Y-axis direction. The X axis, Y axis and Z axis directions are perpendicular to each other. The terms of "upper", "top", "lower", "bottom", "left", "right", and the like in the description of the embodiments of the present application are described according to the orientations shown in fig. 2 of the present application, which do not limit the energy storage device 1000 in the practical application scenario. The use of "identical", "equal" or "parallel" in the following allows for some tolerance.

Referring to fig. 3 and 4 in combination, fig. 3 is a schematic structural view of an end cap assembly of the energy storage device shown in fig. 2, and fig. 4 is a schematic structural view of an end cap assembly of the energy storage device shown in fig. 2 at another angle.

The application end cover subassembly includes end cover, utmost point post, goes up plastic, sealing washer, lower plastic and briquetting, and wherein, utmost point post, last plastic, sealing washer and briquetting are two, are used for corresponding anodal ear and negative pole ear respectively. The structures of the pole post, the upper plastic, the sealing ring, the lower plastic and the pressing block corresponding to the positive pole lug and the negative pole lug can be the same or different. The positive electrode tab and the negative electrode tab are described below.

The end cap assembly 100 includes an end cap 10, first and second posts 21, 22, first and second upper plastics 31, 32, first and second seal rings 41, 42, a lower plastics 50, a first press block 61, and a second press block 62.

Wherein the first pole 21 may be defined as a positive pole and the second pole 22 as a negative pole, or the first pole 21 may be defined as a negative pole and the second pole 22 as a positive pole. Illustratively, the first pole 21 is a negative pole and the second pole 22 is a positive pole.

The first pole 21 and the second pole 22 are located at opposite ends of the end cap assembly 100 in the length direction, respectively. The cap 10 and the lower plastic 50 are stacked in the thickness direction of the cap assembly 100.

The first pole 21, the first upper plastic 31, the first seal ring 41 and the first pressing block 61 are sequentially and correspondingly arranged and connected with the end cover 10 and the lower plastic 50. The first pole 21 is insulated and sealed from the end cap 10 by the cooperation of the first upper plastic 31, the first sealing ring 41 and the plastic plate. The second post 22, the second upper plastic 32, the second seal ring 42, and the second press 62 are disposed in sequence in correspondence and connected to the end cap 10 and the lower plastic 50. The second post 22 is insulated and sealed from the end cap 10 by the cooperation of the second upper plastic 32, the second seal ring 42, and the plastic plate.

Referring to fig. 5 and 6 in combination, fig. 5 is an exploded view of the end cap assembly shown in fig. 3, and fig. 6 is an exploded view of the end cap assembly shown in fig. 3 at another angle.

In this embodiment, the first press block 61 includes a first upper surface 611 and a first lower surface 612. The first upper surface 611 and the first lower surface 612 are disposed opposite to each other in the thickness direction of the first press block 61. The first press block 61 further includes a first post through hole 613, and the first post through hole 613 penetrates the first upper surface 611 and the first lower surface 612 in the thickness direction of the first press block 61 for the first post 21 to pass through.

The second press block 62 has the same structure as the first press block 61, and the second press block 62 includes a second upper surface 621 and a second lower surface 622. The second upper surface 621 and the second lower surface 622 are disposed opposite to each other in the thickness direction of the second press block 62. The second pressing block 62 further includes a second post through hole 623, and the second post through hole 623 penetrates the second upper surface 621 and the second lower surface 622 in the thickness direction of the second pressing block 62 for the second post 22 to pass through. In other embodiments, the structure of the second press block 62 and the structure of the first press block 61 may be different.

Referring to fig. 7A and 7B in combination, fig. 7A is a schematic structural view of the first pole of the end cap assembly shown in fig. 5, and fig. 7B is a schematic sectional structural view of the first pole shown in fig. 7A.

The first pole 21 includes a first flange 211 and a first body 212, and the first body 212 is connected to a surface of one side of the first flange 211 in a height direction of the first pole 21. In this embodiment, the first flange 211 is a circular block body, which includes a first surface 2111 and a second surface 2112, and the first surface 2111 and the second surface 2112 are disposed opposite to each other in the thickness direction of the first flange 211. The first body 212 is protruded on the second surface 2112 of the first flange 211. The first flange 211 and the first body 212 are coaxially disposed. The first pole 21 further includes a first step 213, the first step 213 is disposed around the outer circumference of the first body 212, and the first step 213 is formed by cutting the periphery of a part of the end of the first body 212, which may be understood as a recess formed in the direction of the central axis of the first body 212. The first body 212 may be generally T-shaped in cross-section. The first step 213 includes a first step face 2131, the first step face 2131 being disposed opposite the first flange 211. The first step surface 2131 is an annular surface.

In the present embodiment, the first step surface 2131 is inclined toward the central axis of the first body 212, that is, the outer peripheral edge of the first step surface 2131 is inclined toward the inner peripheral edge of the first step surface 2131. It will be appreciated that the first step surface 2131 is a chamfer, in particular an annular chamfer sloping towards the centre of the first pole 21.

In this embodiment, the first electrode 21 is a negative electrode. The first pole 21 further includes a first metal portion 214 and a second metal portion 215, and the first metal portion 214 and the second metal portion 215 may be formed by integral stamping. Along the height direction of the first pole 21, the first metal portion 214 covers a side of the second metal portion 215 facing away from the first flange 211 of the first pole 21, and it is understood that the first metal portion 214 is an outer surface of the column of the first pole 21. The first step 213 is formed at the first metal portion 214. In this embodiment, the first pole 21 may be a copper-aluminum composite structure manufactured by a stamping process, and the manufacturing process is simple, the manufacturing efficiency is improved, and the manufacturing cost of the first pole 21 can be effectively reduced. Illustratively, the first metal portion 214 of the first pole 21 is made of copper and the second metal portion 215 is made of aluminum. The first flange 211 is integrally formed with the second metal portion 215. In other embodiments, the first metal portion 214 may be made of an aluminum material and the second metal portion 215 may be made of a copper material.

Referring to fig. 8A and 8B in combination, fig. 8A is a schematic structural view of the second post of the end cap assembly shown in fig. 5, and fig. 8B is a schematic sectional structural view of the second post shown in fig. 8A.

The structure of the second pole 22 is similar to that of the first pole 21, except that the material of the second pole 22 is different from that of the first pole 21. The second post 22 in this embodiment is a positive post. The second pole 22 includes a second flange 221 and a second body 222, and the second body 222 has the same structure as the first body 212. In the present embodiment, the second flange 221 includes a third surface 2211 and a fourth surface 2212, and the third surface 2211 and the fourth surface 2212 are disposed opposite to each other in the thickness direction of the second flange 221. The structure of the second flange 221 is different from that of the first flange 211 in that the third surface 2211 of the second flange 221 is a stepped surface. The second post 22 further includes a second step 223, the second step 223 having a structure identical to the structure of the first step 213, the second step 223 including a second step surface 2231, the second step surface 2231 being substantially annular. The second step surface 2231 is inclined toward the central axis direction of the second body 222, that is, the outer peripheral edge of the second step surface 2231 is inclined toward the inner peripheral edge of the second step surface 2231.

In this embodiment, the second post 22 may be made of copper material by punching. In other embodiments, the second post 22 may be aluminum.

Referring to fig. 9A and 9B in combination, fig. 9A is a schematic cross-sectional structure of a first upper plastic of the end cap assembly shown in fig. 5, and fig. 9B is a schematic cross-sectional structure of a second upper plastic of the end cap assembly shown in fig. 5.

The first upper plastic 31 includes a first body 311 and a first extension 312. The first extension portion 312 is connected to one end of the first body 311, and the first body 311 protrudes out of the outer periphery of the first extension portion 312 and encloses a first through hole 313 together with the first extension portion 312. The first through hole 313 is a stepped hole. In this embodiment, the first body 311 is an annular cylinder, and its cross section may be substantially L-shaped. The first extension portion 312 is in a ring-shaped column shape, and the first body 311 and the first extension portion 312 are coaxially disposed. Specifically, the first body 311 includes a first section 314 and a second section 315, and the second section 315 is connected to one end of the first section 314 and extends toward the central axis of the first section 314. The angle of connection of the first segment 314 to the second segment 315 is greater than 0 degrees. In this embodiment, the first extension 312 is connected to an end of the second section 315 facing away from the first section 314, and the diameter of the first extension 312 is smaller than the diameter of the first section 314 and is equal to the diameter of the inner ring of the second section 315. The second segment 315 includes a first mounting surface 3151 and a second mounting surface 3152. The first mounting surface 3151 and the second mounting surface 3152 are disposed opposite to each other in the thickness direction of the second segment 315. The first mounting surface 3151 is a stepped surface in the first through hole 313, and the second mounting surface 3152 is an outer stepped surface of the first upper plastic 31.

In the present embodiment, the structure of the second upper plastic 32 is the same as that of the first upper plastic 31. The second upper plastic 32 includes a second body 321 and a second extension 322. The second body 321 and the second extension portion 322 jointly enclose a second through hole 323. In this embodiment, the structure of the second extension portion 322 is the same as that of the first extension portion 312, the structure of the second body 321 is also the same as that of the first body 311, and the second body 321 includes a third section 324 and a fourth section 325. The fourth segment 325 has the same structure as the second segment 315, and the fourth segment 325 includes a third mounting face 3251 and a fourth mounting face 3252. The second through hole 323 has the same shape as the first through hole 313, and is a stepped hole. The third mounting surface 3251 is a stepped surface in the second through hole 323, and the fourth mounting surface 3252 is an outer stepped surface of the second upper plastic 32. In other embodiments, the structure of the second upper plastic 32 may be different from that of the first upper plastic 31.

Referring to fig. 10, fig. 10 is a schematic cross-sectional view of an end cap of the end cap assembly shown in fig. 5.

The end cap 10 may be a generally rectangular plate. In this embodiment, the end cap 10 is a light aluminum sheet. The end cap 10 includes a first surface 11 and a second surface 12, the first surface 11 and the second surface 12 being disposed opposite to each other in a thickness direction of the end cap 10.

The end cap 10 includes a first mounting groove 13 and a second mounting groove 14, the first mounting groove 13 and the second mounting groove 14 being located at opposite ends of the end cap 10 in the length direction, respectively. The first mounting groove 13 may be a rectangular groove body, the opening of the first mounting groove 13 is located on the second surface 12, and the first mounting groove 13 is recessed from the second surface 12 toward the first surface 11. The first mounting groove 13 includes a first groove side wall 131 and a first groove bottom wall 132. The first groove sidewall 131 is provided with a first engaging member 133 for engaging and fixing with the lower plastic 50. In this embodiment, the number of the first engaging members 133 is two, and the two engaging members are respectively located on opposite sides of the first mounting groove 13 in the width direction. The first groove side wall 131 is provided with a recess, and the first engaging piece 133 is a recess and extends into the first mounting groove 13. The first engaging member 133 is an elastic buckle.

In the present embodiment, the structure of the second mounting groove 14 is the same as that of the first mounting groove 13. The opening of the second mounting groove 14 is located on the second surface 12, and the second mounting groove 14 is recessed from the second surface 12 toward the first surface 11. The second mounting groove 14 includes a second groove side wall 141 and a second groove bottom wall 142. The second groove sidewall 141 is provided with a second engaging member 143 for engaging and fixing with the lower plastic 50. The second engaging member 143 has the same structure as the first engaging member 133. In this embodiment, the number of the second engaging members 143 is two, and the second engaging members are respectively located on two opposite sides of the second mounting groove 14 in the width direction. The second engaging member 143 is an elastic buckle. The end cap 10 further includes a first mounting hole 15 and a second mounting hole 16. The first mounting hole 15 and the second mounting hole 16 are respectively located at both ends of the end cover 10 in the length direction. The first mounting hole 15 penetrates the first surface 11 and the first groove bottom wall 132 in the thickness direction of the end cap 10. The second mounting hole 16 penetrates the first surface 11 and the second groove bottom wall 142.

The end cap 10 further comprises a first guide projection 17 and a second guide projection 18. The first guide projection 17 is provided to project from the first groove bottom wall 132, and the first guide projection 17 extends toward the notch direction of the first mounting groove 13. The first guide projection 17 is disposed around the periphery of the first mounting hole 15. In this embodiment, the first guide projection 17 has a substantially triangular cross section, and the first guide projection 17 may have a continuous annular structure. In other embodiments, the first guide protrusion 17 may be a plurality of protrusions, which may be spaced along the circumference of the first mounting hole 15. The first guide projection 17 includes a first guide surface 171, the first guide surface 171 being a sloped or arcuate surface, the first guide surface 171 facing away from the first mounting hole 15 and toward the first slot sidewall 131. The surface of the first guide projection 17 which is connected to the first guide surface 171, i.e., the surface facing away from the first groove side wall 131, is connected to the wall of the first mounting hole 15. The surface of the first guide projection 17 connected to the first guide surface 171 in this embodiment is coplanar with the wall of the first mounting hole 15.

The second guide projection 18 has the same structure as the first guide projection 17. The second guide projection 18 is provided protruding from the second groove bottom wall 142 and extends toward the notch direction of the second mounting groove 14. The second guide projection 18 is disposed around the periphery of the second mounting hole 16. The second guide projection 18 may be a continuous annular structure. In other embodiments, the second guide projection 18 may be a plurality of projections that may be spaced along the periphery of the second mounting hole 16. The second guide projection 18 includes a second guide surface 181, and the second guide surface 181 is a slant surface or an arc surface.

Referring to fig. 11A and 11B in combination, fig. 11A is a schematic cross-sectional structure of a first embodiment of a first seal ring of the end cap assembly shown in fig. 5, and fig. 11B is a schematic cross-sectional structure of a first embodiment of a second seal ring of the end cap assembly shown in fig. 5.

The first seal ring 41 includes a first seal ring body 410 and a first seal flange 415. The first seal ring body 410 includes a first insulating surface 411, a second insulating surface 412, and a first inner annular surface 413. The first insulating surface 411 and the second insulating surface 412 are disposed opposite to each other in the thickness direction of the first seal ring 41. The first inner annular surface 413 is connected between the first insulating surface 411 and the second insulating surface 412. The first seal ring 41 includes a first seal hole 414. The first inner annular surface 413 is a wall of the first seal hole 414. The first insulating surface 411 and the second insulating surface 412 surround the first seal hole 414.

The first sealing flange 415 is disposed protruding from the first inner annular surface 413 and surrounding the bore axis of the first sealing bore 414. The first sealing flange 415 is for abutting against the first extension 312 of the first upper plastic 31. The width of the first sealing flange 415 is adjusted according to the position where the first sealing flange 415 abuts against the first extension 312. The first seal 41 may be made of an elastic insulating material such as fluororubber or silicone rubber. In this embodiment, the first seal ring 41 is annular, the cross section of the first seal ring 41 may be substantially in a stepped shape, and the first seal hole 414 is a stepped hole.

In the present embodiment, the structure of the second seal ring 42 is the same as that of the first seal ring 41. The second seal ring body of the second seal ring 42 includes a third insulating surface 421, a fourth insulating surface 422, and a second inner annular surface 423. The third insulating surface 421 and the fourth insulating surface 422 are disposed opposite to each other in the thickness direction of the second seal ring 42. The second inner annular surface 423 is connected between the third insulating surface 421 and the fourth insulating surface 422. The second seal ring 42 includes a second seal bore 424. The second inner annular surface 423 is a wall of the second seal hole 424. The second seal ring 42 also includes a second sealing flange 425, the second sealing flange 425 having the same structure as the first sealing flange 415. In other embodiments, the second seal ring 42 may be configured differently from the first seal ring 41.

Referring to fig. 12A and 12B in combination, fig. 12A is a schematic cross-sectional structure of a second embodiment of the first seal ring of the end cap assembly shown in fig. 5, and fig. 12B is a schematic cross-sectional structure of a second embodiment of the second seal ring of the end cap assembly shown in fig. 5.

The seal ring of the present embodiment differs from the seal ring described above in that the first seal ring 41 further includes a first convex ring 416. The first collar 416 is an annular protrusion. The first collar 416 protrudes from the surface of the first sealing flange 415 facing away from the first inner annulus 413 and surrounds the bore axis of the first sealing bore 414.

The first convex ring 416 is spaced apart from the first seal ring body 410, and the first convex ring 416, the first seal ring body 410, and the first seal flange 415 form a first gap 417. The first void 417 is for receiving the first guide projection 17 of the end cap 10. The first collar 416 includes a first top surface 4161, a first side surface 4162, and a second side surface 4163. The first side 4162 and the second side 4163 are disposed opposite in the radial direction of the first collar 416. The first top surface 4161 is connected between the first side surface 4162 and the second side surface 4163. The first top surface 4161 is an annular surface facing away from the first sealing flange 415. The first side 4162 faces the first inner annular surface 413 and is spaced apart from the first inner annular surface 413. The second side 4163 faces the hole axis direction of the first seal hole 414. It is understood that the second side 4163 is the wall of the first seal bore 414. The first side 4162, the surface of the first sealing flange 415 facing the first insulating surface 411 and the first inner annular surface 413 are surfaces of a first void 417, the first void 417 being annular and concave in cross-section, the first void 417 being adapted to receive the first guide projection 17 of the end cap 10.

In this embodiment, the second seal ring 42 has the same structure as the first seal ring 41. The second seal ring 42 includes a second collar 426. The second collar 426 is identical in structure to the first collar 416. The second collar 426 protrudes from the surface of the second sealing flange 425 facing away from the second inner annular surface 423 and surrounds the bore axis of the second sealing bore 424.

The second collar 426 is spaced apart from the second seal ring body and the second seal flange and defines a second gap 427. The second void 427 is for receiving the second guide projection 18 of the end cap 10. The second collar 426 includes a second top surface 4261, a third side surface 4262, and a fourth side surface 4263, the third side surface 4262 and the fourth side surface 4263 being disposed opposite each other in a radial direction of the second collar 426. The second top surface 4261 is connected between the third side surface 4262 and the fourth side surface 4263. The second top surface 4261 is an annular surface facing away from the second sealing flange 425. The third side 4262 faces the second inner annular surface 423 and is spaced apart from the second inner annular surface 423. The fourth side 4263 faces in the hole axis direction of the second seal hole 424. It is understood that the fourth side 4263 is the wall of the second seal bore 424. The second void 427 is for receiving the second guide projection 18 of the end cap 10.

Referring to fig. 13 and 14 in combination, fig. 13 is a schematic structural view of the lower plastic of the end cap assembly shown in fig. 5, and fig. 14 is a schematic sectional structural view of the lower plastic shown in fig. 13 taken along the N-N.

The lower plastic 50 includes a plastic body 51. The plastic body 51 is a substantially rectangular thin plate. The length of the plastic body 51 is the same as the length of the end cap 10, and the width of the plastic body 51 corresponds to the length of the end cap 10, allowing for a range of tolerances. The plastic body 51 includes a third surface 511 and a fourth surface 512, and the third surface 511 and the fourth surface 512 are disposed opposite to each other along a thickness direction of the plastic body 51. In this embodiment, the lower plastic 50 may be made of plastic material.

The lower plastic 50 includes a first relief groove 52 and a second relief groove 53. The first avoidance groove 52 and the second avoidance groove 53 are respectively positioned at two opposite sides of the length direction of the lower plastic 50. The openings of the first relief grooves 52 are all located on the fourth surface 512. The first relief opening is recessed from the fourth surface 512 in the direction of the third surface 511. The first relief groove 52 includes a first bottom wall 521 and a first side wall 522. The first side wall 522 surrounds the periphery of the first bottom wall 521 and is connected with the first bottom wall 521; the first bottom wall 521 faces the opening of the first escape groove 52.

In this embodiment, the structure of the second escape groove 53 is the same as that of the first escape groove 52. The opening of the second relief groove 53 is located at the fourth surface 512. The second escape grooves 53 are recessed from the fourth surface 512 in the direction of the third surface 511. The second escape groove 53 includes a second bottom wall 531 and a second side wall 532. The second side wall 532 surrounds the periphery of the second bottom wall 531 and is connected to the second bottom wall 531; the second bottom wall 531 faces the opening of the second escape groove 53.

The lower plastic 50 further includes a first boss 54 and a second boss 55. The first boss 54 and the second boss 55 are protruding on the third surface 511, and are respectively located at two opposite ends of the plastic body 51 in the length direction. The first relief groove 52 is recessed from the fourth surface 512 toward the third surface 511 and protrudes from the third surface 511 to form a first boss 54. The shape of the first boss 54 matches the shape of the first relief groove 52. The first boss 54 includes a first boss face 541 and a first boss side face 542. The first boss 541 is a surface of the first boss 54 facing away from the plastic body 51, and the first boss 541 is substantially rectangular. The first boss side 542 is connected between the first boss side 541 and the third surface 511. The first boss side surface 542 is generally square annular. The first boss side surface 542 is provided with a first buckle 513 for engaging and fixing with the first engaging member 133 of the end cap 10. In this embodiment, there are two first buckles 513 respectively on two opposite sides of the width direction of the first boss 54. The first boss side surface 542 is provided with a recess, and the first catch 513 is a recess and extends in the center direction of the first boss 54. The first buckle 513 is an elastic hook.

In this embodiment, the structure of the second boss 55 is the same as that of the first boss 54. The second avoidance groove 53 is recessed from the fourth surface 512 toward the third surface 511, and protrudes from the third surface 511 to form a second boss 55. The second boss 55 includes a second boss face 551 and a second boss side face 552. The second boss 551 is a surface of the second boss 55 facing away from the plastic body 51. The second boss side 552 is provided with a second catch 514 for engaging with the second engaging member 143 of the end cap 10. In this embodiment, there are two second latches 514 respectively on two opposite sides of the second boss side surface 552 in the width direction. The second boss side surface 552 is provided with a recess, and the second catch 514 is a recess and extends in the center direction of the second boss 55. The second buckle 514 is an elastic hook. In other embodiments, the structure of the first boss 54 and the structure of the second boss 55 may be different.

The lower plastic 50 includes a first assembly hole 56 and a second assembly hole 57. The first and second fitting holes 56 and 57 are located at opposite ends of the lower plastic 50 in the length direction, respectively. The first assembly hole 56 penetrates through the first boss 541 and the first bottom wall 521 along the thickness direction of the lower plastic 50. The first fitting hole 56 communicates with the first escape groove 52. The first fitting hole 56 is a circular hole. The first fitting hole 56 includes a third guide surface 561. The third guide surface 561 is disposed around the circumference of the first fitting hole 56. The third guiding surface 561 is a wall of the first fitting hole 56, which may be a slope or an arc surface, for guiding the installation of the first sealing ring 41. In this embodiment, the third guide surface 561 is an inclined surface, and the third guide surface 561 is inclined from the first mounting hole 56 toward the first sidewall 522.

The second fitting hole 57 has the same structure as the first fitting hole 56. The second assembly hole 57 penetrates through the second boss 551 and the second bottom wall 531 along the thickness direction of the lower plastic 50. The second fitting hole 57 communicates with the second escape groove 53. The second fitting hole 57 includes a fourth guide surface 571. The fourth guide surface 571 is identical to the third guide surface 561. The fourth guide surface 571 is disposed around the periphery of the second fitting hole 57. The fourth guide surface 571 is a wall of the second fitting hole 57, which may be a slant surface or an arc surface, for guiding the installation of the second seal ring 42. In this embodiment, the fourth guide surface 571 is an inclined surface, and the fourth guide surface 571 is inclined in the direction of the second side wall 532 by the second fitting hole 57. In other embodiments, the structure of the first fitting hole 56 and the structure of the second fitting hole 57 may be different.

Referring to fig. 5, 13, 15A and 15B in combination, fig. 15A is a schematic cross-sectional structure of a portion of the first embodiment of the end cap assembly shown in fig. 3 taken along M-M, and fig. 15B is a schematic cross-sectional structure of another portion of the first embodiment of the end cap assembly shown in fig. 3 taken along M-M.

In this embodiment, the end cap 10 and the lower plastic 50 are stacked in the Z-axis direction. The first pole 21 is assembled with the first upper plastic 31 and then passes through one end of the end cap 10 and the lower plastic 50 in the Y-axis direction, and the second pole 22 is assembled with the second upper plastic 32 and then passes through the other end of the end cap 10 and the lower plastic 50 in the Y-axis direction. The first pole 21 protrudes from the first upper plastic 31 and protrudes from the lower plastic 50. One end of the first upper plastic 31 protrudes from the end cap 10. The first sealing ring 41 and the first pressing block 61 are arranged on the side of the end cover 10 facing the lower plastic 50. The first sealing ring 41 is sleeved at one end of the first upper plastic 31, and is located in a gap defined by the first upper plastic 31, the end cap 10 and the lower plastic 50. The first pressing block 61 is located at one side of the lower plastic 50, sleeved on the end of the first pole 21, and is in pressure connection with the end of the first pole 21, so that the first pole 21 is locally deformed. At the same time, the first pressing block 61 abuts against the first upper plastic 31 and the lower plastic 50, so that the first sealing ring 41 is pressed to deform. The second post 22 protrudes from the second upper plastic 32 and protrudes from the lower plastic 50. One end of the second upper plastic 32 protrudes from the end cap 10. The second seal ring 42 and the first press block 61 are provided on the side of the end cap 10 facing the lower plastic 50. The second sealing ring 42 is sleeved on one end of the second upper plastic 32, and is located in a gap defined by the second upper plastic 32, the end cap 10 and the lower plastic 50. The second pressing block 62 is sleeved on the end of the second pole 22 and is in pressure connection with the end of the second pole 22, so that the second pole 22 is locally deformed. While the second press block 62 abuts the second upper plastic 32 and the lower plastic 50, thereby pressing the second seal ring 42 to deform.

Wherein the end cap 10 and the lower plastic 50 are assembled, the third surface 511 of the plastic body 51 abuts against the second surface 12 of the end cap 10, and the fourth surface 512 of the plastic body 51 faces the housing (not shown) and faces away from the end cap 10. The first buckle 513 of the plastic body 51 is fixedly clamped with the first clamping piece 133 of the end cover 10, and the second buckle 514 of the plastic body 51 is fixedly clamped with the second clamping piece 143 of the end cover 10, so that the lower plastic 50 is clamped with the end cover 10, the working stability of the end cover assembly 100 is improved, and the structural strength of the end cover assembly 100 is ensured.

The first boss 54 of the lower plastic 50 mates with the first mounting slot 13 of the end cap 10, i.e., the first boss 54 is received in the first mounting slot 13. The first boss surface 541 of the first boss 54 abuts against the first groove bottom wall 132 of the first mounting groove 13. The first boss side surface 542 of the first boss 54 abuts against the first groove side wall 131 of the first mounting groove 13. The first fitting hole 56 of the lower plastic 50 and the first mounting hole 15 are coaxial and communicate. The diameter of the first fitting hole 56 is larger than that of the first mounting hole 15, so that there is a first receiving gap a between the first guide protrusion 17 of the end cap 10 and the third guide surface 561 of the first fitting hole 56 of the lower plastic 50, the first receiving gap a receiving the first sealing ring 41; in the thickness direction of the end cap assembly, the orthographic projection of the first receiving gap a is located in the first mounting groove 13. It will be appreciated that the first guide surface 171 of the end cap 10 and the third guide surface 561 of the lower plastic 50 are oppositely spaced apart and form a "horn" shaped guide structure.

The second boss 55 of the lower plastic 50 mates with the second mounting groove 14 of the end cap 10, i.e., the second boss 55 is received in the second mounting groove 14. The second boss surface 551 of the second boss 55 abuts the second groove bottom wall 142 of the second mounting groove 14. The second boss side surface 552 of the second boss 55 abuts against the second groove side wall 141 of the second mounting groove 14. The second fitting hole 57 of the lower plastic 50 and the second mounting hole 16 are coaxially disposed. The second fitting hole 57 has a diameter larger than that of the second mounting hole 16 so that there is a second receiving gap B between the second guide projection 18 of the end cap 10 and the second boss 55 of the lower plastic 50, the second receiving gap B receiving the second seal ring 42. It will be appreciated that the second guide surface 181 of the end cap 10 and the fourth guide surface 571 of the lower plastic 50 are oppositely spaced apart and form a "horn" shaped guide structure.

The first pole 21 passes through the first upper plastic 31, the end cap 10 and the lower plastic 50 in sequence. In this embodiment, the first main body 212 of the first pole 21 passes through the first through hole 313 of the first upper plastic 31, and in this embodiment, the first step 213 of the first main body 212 may be flush with the end surface of the first extension 312 of the first upper plastic 31 facing away from the first body 311. The outer peripheral surface of the first body 212 abuts against the inner peripheral surface of the first extension 312, and it is also understood that the outer peripheral surface of the first body 212 abuts against the wall of the first through hole 313. The first flange 211 of the first pole 21 is accommodated in the first body 311 of the first upper plastic 31. The first flange 211 abuts against the first section 314 and the second section 315 of the first body 311. It will be appreciated that the first face 2111 of the first flange 211 is disposed away from the first body 311, the peripheral side of the first flange 211 abutting the inner periphery of the first section 314, and the second face 2112 abutting the first mounting face 3151 of the second section 315.

The first pole 21 and the first upper plastic 31 are assembled together through the first mounting hole 15 of the end cap 10 and the first mounting hole 56 of the lower plastic 50. The first upper plastic 31 is located between the first pole 21 and the end cap 10, and is used for insulating the first pole 21 and the end cap 10, so that the safety performance of the end cap assembly 100 is ensured. The first body 311 of the first upper plastic 31 abuts against the end cover 10, wherein the first section 314 extends away from the end cover 10, and the second mounting surface 3152 of the second section 315 abuts against the first surface 11 of the end cover 10. The first extension portion 312 of the first upper plastic 31 passes through the first mounting hole 15 of the end cover 10, and the outer peripheral surface of the first extension portion 312 abuts against the wall of the first mounting hole 15. The first extension 312 of the first upper plastic 31 and the first body 212 of the first pole 21 protrude from the first guide protrusion 17 of the end cap 10. In this embodiment, the end faces of the first step surface 2131 of the first step 213 and the first extension portion 312 facing away from the first body 311 may be flush with the first bottom wall 521 of the first avoidance groove 52 of the lower plastic 50, so as to avoid the problem that the contact interface of the subsequent structural member of the end cover assembly 100 is uneven during the assembly process, and improve the safety of the end cover assembly 100 during the assembly.

After the first upper plastic 31 and the first pole 21 are assembled to the end cap 10 and the lower plastic 50, the first sealing ring 41 is accommodated in the first accommodation gap a, and is also positioned in the first mounting groove 13, and the first sealing ring 41 surrounds the portion of the first extension 312 of the first upper plastic 31 protruding from the first mounting groove 13 and surrounds the first guiding protrusion 17. When the first sealing ring 41 is installed in the first accommodating gap a, that is, when the first sealing ring is assembled with the end cover 10 and the lower plastic 50, the first guiding surface 171 and the third guiding surface 561 are inclined surfaces or arc surfaces, the third guiding surface 561 and the first guiding surface 171 jointly guide the sealing ring air passage, so that the installation precision of the first sealing ring 41 is ensured, the first sealing ring 41 can be jointly abutted, the abutting area is increased, and the sealing performance is improved. If only the first guiding surface 171 is provided, the installation of the first sealing ring can be guided, so that the first sealing ring 41 can be ensured to be completely positioned in the first installation groove 13, poor sealing performance of the end cover assembly 100 caused by the matching dislocation of the first sealing ring 41 and the first pole 21 is avoided, the assembly efficiency and the yield of the end cover assembly 100 are improved, and the safety performance of the energy storage device 1000 is also improved.

The first pressing block 61 is accommodated in the first avoiding groove 52 of the lower plastic 50 and sleeved on the outer periphery of the first main body 212 of the first pole 21. The first press block 61 is insulated from the end cap 10 by the first seal ring 41 and the lower plastic 50. Specifically, the outer side surface of the first pressing block 61 abuts against the first side wall 522 of the first escape groove 52. The first post through hole 613 of the first press block 61 accommodates a portion of the first main body 212 of the first post 21 protruding from the first upper plastic 31, and a hole wall of the first post through hole 613 abuts against an outer peripheral surface of the first main body 212 protruding from one end of the first upper plastic 31. The first step 213 of the first body 212 abuts against the first pressing block 61, that is, the first step surface 2131 abuts against the inner periphery of the first upper surface 611 of the first pressing block 61, and the first upper surface 611 also abuts against the end of the first extension 312, the second insulating surface 412 of the first seal ring 41, and the first bottom wall 521 of the first escape groove 52. The first lower surface 612 is spaced apart from the first seal flange 415 of the first seal ring 41.

In the thickness direction of the end cap assembly 100, the first seal ring 41 is sandwiched between the end cap 10 and the first press block 61, and is deformed by the sandwiching force of the end cap 10 and the first press block 61, thereby insulating the end cap 10 and the first press block 61 and sealing the end cap assembly 100. The first seal ring 41 may be an interference fit between the first press block 61 and the end cap 10, so that the tightness of the first seal ring 41 can be further improved. When the end cap 10 and the first press block 61 compress the first seal ring 41 together, the thickness of the first seal ring 41 (the vertical distance in the Z-axis direction from the first insulating surface 411 to the second insulating surface 412) decreases and decreases to be equal to the distance from the second surface 12 of the end cap 10 to the first upper surface 611 of the first press block 61. The outer circumferential surface of the first sealing ring 41 abuts against the hole wall of the first assembly hole 56 of the lower plastic 50, and is disposed opposite to the third guiding surface 561 at a distance. The first insulating surface 411 of the first seal ring 41 abuts against the first groove bottom wall 132 of the first mounting groove 13, and the second insulating surface 412 is disposed opposite to the first groove bottom wall 132. The first seal flange 415 of the first seal ring 41 abuts against the outer peripheral surface of the first extension portion 312, that is, the wall of the first seal hole 414 of the first seal ring 41 abuts against the outer peripheral surface of the first extension portion 312. The first seal flange 415 of the first seal ring 41 is opposed to the first guide projection 17 in the thickness direction of the end cap assembly 100, and can be in contact or abutting contact. The first inner annular surface 413 of the first seal ring 41 is opposite the first guide surface 171. The space enclosed by the first pressing block 61, the first upper plastic 31, the first sealing ring 41, the end cover 10 and the lower plastic 50 is a stress release space, and is used for providing a deformation space for deformation of the first sealing ring 41 when being stressed. That is, when the first sealing ring 41 is deformed by extrusion, the first sealing ring 41 can deform and fill the space, thereby releasing stress, avoiding the compression damage of the first sealing ring 41, ensuring the sealing performance of the first sealing ring 41, and improving the safety performance of the energy storage device 1000.

In the present embodiment, the first press block 61 and the first pole 21 may be fixed and electrically connected by a laser tailor-welded process. Namely, the first press piece 61 and the first metal portion 214 of the first pole 21 are welded to each other at the connection interface. The first metal portion 214 and the first pressing block 61 may be made of the same material, such as copper. In the prior art, since the flatness of the connection interface of the first press block 61 and the first pole 21 is difficult to ensure, a gap is easily present between the first press block 61 and the first pole 21, and the gap allows smoke (smoke components mainly including metal particles and carbon) generated during welding to invade the end cap assembly 100 and affect the safety performance of the energy storage device 1000. Whereas in the present embodiment the first pole 21 has an inclined first step 213, i.e. the surface of the first pole 21 has a slope. When the first presser 61 presses against the first pole 21, the first presser 61 is pressed against the first step 213 of the first main body 212, and the first step surface 2131 is deformed by the pressure of the first presser 61 and abuts against the inner peripheral edge of the first upper surface 611.

Wherein the first pressing block 61 is opposite to the first groove bottom wall 132 of the first mounting groove 13 and presses the first seal ring 41 to deform. The edge of the first step surface 2131 away from the first body 212 is deformed in the direction of the first flange 211, and the angle between the first step surface 2131 and the first body 212 is between 85-90 degrees (allowing a certain tolerance range). It may be understood that the inclined surface becomes parallel or substantially parallel to the first lower surface 612 when the first step surface 2131 is deformed, so that the first step surface 2131 contacts the first lower surface 612 of the first pressing block 61 more tightly (compared with the matching of the inclined surface and the plane), the gap between the inclined steps of the first pressing block 61 and the first pole 21 is eliminated, the connection tightness is improved, and the smoke generated when the first pole 21 and the first pressing block 61 are welded is prevented from invading between the end cover 10 and the first pressing block 61, thereby improving the safety of the energy storage device 1000. The inclined surface of the first step surface 2131 before the pressing of the first pressing piece 61 is changed to a flat surface after the pressing, and the form of the first step surface 2131 is changed, and the engaged state is the final state, and may still be referred to as the first step surface 2131.

The second post 22 passes through the second upper plastic 32, the end cap 10, and the lower plastic 50 in sequence. The second body 222 of the second post 22 passes through the second through hole 323 of the second upper plastic 32, and in this embodiment, the second step 223 of the second body 222 may be flush with the end surface of the second extension 322 of the second upper plastic 32 facing away from the second body 321. The outer circumferential surface of the second body 222 abuts against the inner circumferential surface of the second extension portion 322, and it is also understood that the outer circumferential surface of the second body 222 abuts against the wall of the second through hole 323. The second flange 221 of the second post 22 is received in the second body 321 of the second upper plastic 32. The second flange 221 abuts against the third section 324 and the fourth section 325 of the second body 321. It is understood that the third surface 2211 of the second flange 221 is disposed opposite to the second body 321, the peripheral surface of the second flange 221 abuts against the inner periphery of the third section 324, and the fourth surface 2212 abuts against the third mounting surface 3251 of the fourth section 325.

The second post 22 and the second upper plastic 32 are assembled together through the second mounting hole 16 of the end cap 10 and the second mounting hole 57 of the lower plastic 50. The second upper plastic 32 is located between the second post 22 and the end cap 10, and is used for insulating the second post 22 and the end cap 10, so that the safety performance of the end cap assembly 100 is ensured. The second body 321 of the second upper plastic 32 abuts against the end cover 10, wherein the third section 324 extends away from the end cover 10, and the fourth mounting surface 3252 of the fourth section 325 abuts against the first surface 11 of the end cover 10. The second extension portion 322 of the second upper plastic 32 passes through the second mounting hole 16 of the end cover 10, and the outer peripheral surface of the second extension portion 322 abuts against the hole wall of the second mounting hole 16. The second extension 322 of the second upper plastic 32 and the second body 222 of the second post 22 are protruding from the second guide protrusion 18 of the end cap 10. In this embodiment, the second step surface 2231 of the second step 223 and the end surface of the second extension portion 322 may be flush with the second bottom wall 531 of the second avoidance groove 53 of the lower plastic 50, so as to avoid the problem that the contact interface of the end cover assembly 100 is uneven during the assembly process, and improve the safety of the end cover assembly 100 during the assembly process.

The second sealing ring 42 is accommodated in the second accommodating space B and is also located in the second mounting groove 14, and the second sealing ring 42 surrounds the portion of the second extension 322 of the second upper plastic 32 protruding from the second mounting groove 14 and surrounds the second guiding protrusion 18. When the second sealing ring 42 is installed in the second accommodating gap B, that is, when the second sealing ring 42 is assembled with the end cover 10 and the lower plastic 50, the second guiding surface 181 and the fourth guiding surface 571 are inclined surfaces or arc surfaces, so that the installation of the second sealing ring 42 can be guided, the second sealing ring 42 can be ensured to be completely positioned in the second accommodating gap B, the problem that the sealing performance of the end cover assembly 100 is poor due to the matching dislocation of the second sealing ring 42 and the second pole 22 is avoided, the assembly efficiency and the yield of the end cover assembly 100 are improved, and the safety performance of the energy storage device 1000 is also improved. The outer circumferential surface of the second sealing ring 42 abuts against the hole wall of the second assembly hole 57 of the lower plastic 50 and is disposed opposite to the fourth guiding surface 571 at a distance. The third insulating surface 421 of the second seal ring 42 abuts against the second groove bottom wall 142 of the second mounting groove 14, and the fourth insulating surface 422 is disposed opposite to the second groove bottom wall 142. The second sealing flange 425 of the second sealing ring 42 abuts against the outer peripheral surface of the second extension portion 322, that is, the hole wall of the second sealing hole 424 of the second sealing ring 42 abuts against the outer peripheral surface of the second extension portion 322. The second sealing flange 425 of the second sealing ring 42 is opposed to the second guide projection 18 in the thickness direction of the end cap assembly 100, and can contact or abut. The second inner annular surface 423 of the second seal ring 42 is disposed opposite the second guide surface 181 at a distance.

The second pressing block 62 is accommodated in the second avoiding groove 53 of the lower plastic 50 and is sleeved on the outer periphery of the second main body 222 of the second pole 22. The second press block 62 is insulated from the end cap 10 by the second seal ring 42 and the lower plastic 50. Specifically, the outer side surface of the second pressing block 62 abuts against the second side wall 532 of the second escape groove 53. The second post through hole 623 of the second press block 62 accommodates a portion of the second main body 222 of the second post 22 protruding from the second upper plastic 32, and a hole wall of the second post through hole 623 abuts against an outer peripheral surface of the second main body 222 protruding from one end of the second upper plastic 32. The second step 223 of the second body 222 abuts against the second pressing block 62, that is, the second step surface 2231 abuts against the inner periphery of the second upper surface 621 of the second pressing block 62. The second upper surface 621 also abuts against the end of the second extension portion 322, the fourth insulating surface 422 of the second seal ring 42, and the second bottom wall 531 of the second escape groove 53. The second lower surface 622 is spaced from the second sealing flange 425 of the second seal ring 42.

In the thickness direction of the end cap assembly 100, the second seal ring 42 is sandwiched between the end cap 10 and the second pressing block 62, and is used to insulate the end cap 10 and the second pressing block 62 and seal the end cap assembly 100. The second sealing ring 42 is in interference fit between the second pressing block 62 and the end cover 10, so that the tightness of the second sealing ring 42 can be further improved. When the end cap 10 and the second pressing block 62 compress the second seal ring 42 together, the thickness of the second seal ring 42 (the vertical distance in the Z-axis direction of the third insulating surface 421 to the fourth insulating surface 422) decreases and decreases to be equal to the distance from the second surface 12 of the end cap 10 to the second upper surface 621 of the second pressing block 62. The remaining space surrounded by the second pressing block 62, the second upper plastic 32, the second sealing ring 42, the end cover 10 and the lower plastic 50 is a stress release space, so as to provide a deformation space for the second sealing ring 42 to deform when being stressed. When the second sealing ring 42 deforms and is squeezed and filled into the stress release space, the stress is released, the second sealing ring 42 is prevented from being compressed and damaged, and the sealing performance of the second sealing ring 42 and the safety performance of the energy storage device 1000 are ensured.

In this embodiment, the second press 62 and the second post 22 may be fixed and electrically connected by a laser splice welding process. In the prior art, the second pole 22 has an inclined second step 223 due to the problem of welding fume penetrating the end cap assembly 100 and affecting its installation performance. When the second pressing block 62 is pressed against the second pole 22, the second pressing block 62 is pressed against the second step 223 of the second body 222, and the second step surface 2231 is deformed by the pressure and abuts against the inner periphery of the second upper surface 621. The second step surface 2231 is changed from an inclined surface to a plane parallel to the second bottom wall 531 when deformed, so that a gap between the second pressing block 62 and the second pole 22 is eliminated, the connection tightness is improved, smoke generated during welding the second pressing block 62 and the second pole 22 is prevented from entering between the end cover 10 and the second pressing block 62, and the safety of the energy storage device 1000 is improved.

In the present embodiment, the first through hole 313 of the first upper plastic 31, the first mounting hole 15 of the end cap 10, the first mounting hole 56 of the lower plastic 50, the first sealing hole 414 of the first sealing ring 41, and the first post through hole 613 of the first pressing block 61 are coaxially disposed for the first post 21 to pass through. The second through hole 323 of the second upper plastic 32, the second mounting hole 16 of the end cap 10, the second mounting hole 57 of the lower plastic 50, the second sealing hole 424 of the second sealing ring 42, and the second post through hole 623 of the second pressing block 62 are coaxially disposed for the second post 22 to pass through.

Referring to fig. 5, 15A and 16 in combination, fig. 16 is a schematic cross-sectional view of the second embodiment of the end cap assembly shown in fig. 3 taken along M-M.

The difference between the first seal ring 41 in this embodiment and the first seal ring 41 in the embodiment shown in fig. 15A is that the width dimension of the first seal flange 415 of the first seal ring 41 in this embodiment is increased, and at the same time, the height dimension of the first extension 312 of the first upper plastic 31 is shortened.

Specifically, the first seal ring 41 is accommodated in the first accommodation gap a, and is also accommodated in the first assembly hole 56 of the lower plastic 50. The first sealing ring 41 surrounds the portion of the first pole 21 protruding from the first upper plastic 31 and surrounds the first guide protrusion 17. It will be appreciated that the first body 212 of the first pole 21 passes through the first sealing hole 414 of the first sealing ring 41, i.e. the first sealing ring 41 is directly sleeved on the first body 212. The first seal flange 415 is located between the first extension 312 and the first press block 61 in the thickness direction of the end cap assembly, and the end surfaces of the first guide projection 17 and the first extension 312 facing away from the first body 311 abut against the surface of the first seal flange 415 in the thickness direction of the end cap assembly.

In the thickness direction of the end cover assembly 100, the first sealing ring 41 is clamped between the first pressing block 61 and the end cover 10, as shown in fig. 16, the first sealing ring 41 is located in the first mounting groove 13, that is, when the end cover 10 and the lower plastic 50 are assembled, the first guiding surface 171 and the third guiding surface 561 are inclined surfaces or arc surfaces, which can play a guiding role on the first sealing ring, and can ensure that the first sealing ring 41 is completely located in the first accommodating gap a, so that poor sealing performance caused by matching dislocation of the first sealing ring 41 and the first pole 21 is avoided. The outer circumferential surface of the first sealing ring 41 abuts against the hole wall of the first assembly hole 56 of the lower plastic 50, and is disposed opposite to the third guiding surface 561 at a distance. The first insulating surface 411 of the first seal ring 41 abuts against the first groove bottom wall 132 of the first mounting groove 13, and the second insulating surface 412 is disposed opposite to the first groove bottom wall 132. The first sealing flange 415 of the first sealing ring 41 is spaced from the outer circumferential surface of the first main body 212 of the first pole 21, so that a more sufficient space is ensured for filling when the first sealing ring 41 is deformed, and therefore, the stress is released, and the sealing performance of the end cover assembly 100 is improved.

The second seal ring 42 and the second upper plastic 32 in this embodiment are the same as the first seal ring 41 and the first upper plastic 31 in this embodiment, in that the width of the second seal flange 425 is increased, and the height of the second extension 322 of the second upper plastic 32 is shortened. In other embodiments, the second seal ring 42 and the first seal ring 41 may be different, and the second upper plastic 32 and the first upper plastic 31 may be different.

Specifically, the second seal ring 42 is accommodated in the second accommodation gap B, and is also accommodated in the second assembly hole 57 of the lower plastic 50. The second seal ring 42 surrounds the portion of the second post 22 protruding from the second upper plastic 32 and surrounds the second guide projection 18. It will be appreciated that the second body 222 of the second post 22 passes through the second sealing hole 424 of the second sealing ring 42, i.e. the second sealing ring 42 is directly sleeved on the second body 222. A gap is formed between the second inner annular surface 423 of the second seal ring 42 and the outer circumferential surface of the second main body 222, and the gap is used for accommodating an end of the second extension portion 322 facing away from the second body 321 and the second guide protrusion 18 of the end cover 10, so as to play a role in positioning the installation of the second seal ring 42.

In the thickness direction of the end cover assembly 100, the second sealing ring 42 is clamped between the second pressing block 62 and the end cover 10, and the second sealing ring 42 is located in the second mounting groove 14, that is, when the end cover 10 and the lower plastic 50 are assembled, the second guiding surface 181 and the fourth guiding surface 571 are inclined surfaces or arc surfaces, so that the guiding effect on the first sealing ring can be achieved, the second sealing ring 42 can be ensured to be completely located in the second accommodating gap B, and poor sealing performance caused by matching dislocation of the second sealing ring 42 and the second pole 22 is avoided. The outer circumferential surface of the second sealing ring 42 abuts against the wall of the first assembly hole 56 of the lower plastic 50 and is disposed opposite to the fourth guiding surface 571 at a distance. The first insulating surface 411 of the second seal ring 42 abuts against the second groove bottom wall 142 of the second mounting groove 14, and the fourth insulating surface 422 is disposed opposite to the second groove bottom wall 142. The second sealing flange 425 of the second sealing ring 42 is spaced from the outer peripheral surface of the second post 22, so that more sufficient space is ensured for filling the second sealing ring 42 during deformation, thereby releasing stress and improving the sealing performance of the end cap assembly 100. The second sealing flange 425 is located between the second extension portion 322 and the second pressing block 62, and the second guide protrusion 18 and the end surface of the second extension portion 322 facing away from the second body 321 abut against the surface of the second sealing flange 425.

It should be noted that, other structural members in this embodiment are the same as those in the foregoing embodiment, and are not described herein.

Referring to fig. 6, 12A, 12B and 17, fig. 17 is a schematic cross-sectional view of the third embodiment of the end cap assembly shown in fig. 3 taken along M-M.

The first sealing ring 41 in this embodiment is different from the first sealing ring 41 in the above embodiment in that the first sealing ring 41 in this embodiment is the first sealing ring 41 shown in fig. 12A, the first sealing ring 41 includes a first convex ring 416 protruding from the inner periphery of the first sealing flange 415, and the height of the first extension 312 of the first upper plastic 31 is shortened. The first seal 41 also includes a first void 417.

Specifically, the first seal ring 41 is accommodated in the first accommodation gap a, and is also accommodated in the first assembly hole 56 of the lower plastic 50. The first sealing ring 41 surrounds the portion of the first pole 21 protruding from the first upper plastic 31 and surrounds the first guide protrusion 17. It will be appreciated that the first body 212 of the first pole 21 passes through the first sealing hole 414 of the first sealing ring 41, i.e. the first sealing ring 41 is directly sleeved on the first body 212. The second side 4163 of the first convex ring 416 of the first seal ring 41 is spaced from the outer peripheral surface of the first body 212, so that a more sufficient space is ensured for filling the first seal ring 41 during deformation, thereby releasing stress and improving the sealing performance of the end cap assembly 100. First collar 416 is located between first extension 312 and first press block 61. The first convex ring 416 protrudes from the first mounting groove 13 of the end cap 10 and is received in the first mounting hole 15. The first top surface 4161 of the first convex ring 416 abuts against the end surface of the first extension portion 312 facing away from the first body 311. The first side 4162 of the first collar 416 abuts the wall of the first mounting hole 15 of the end cap 10. The first guide surface 171 of the end cap 10 faces away from the first side surface 4162 and is opposite the first inner annular surface 413. The first recess 417 of the first sealing ring 41 is arranged towards the end cap 10 and serves to receive the first guide projection 17 of the end cap 10, thereby positioning the first sealing ring 41 during installation. When the first pressing block 61 presses the first pole 21, the first sealing ring 41 is pressed and fills the first gap 417, so that on one hand, the gap between the first upper plastic 31 and the first pole 21 can be closed, the sealing effect is ensured, and on the other hand, the path of the electrolyte in the energy storage device 1000 penetrating outwards can be prolonged, so that the sealing performance is further improved.

In the thickness direction of the end cap assembly 100, the first seal ring 41 is clamped between the first pressing block 61 and the end cap 10, as shown in fig. 17, the first seal ring 41 is located in the first mounting groove 13, and the first convex ring 416 extends away from the first pressing block 61. When the end cover 10 and the lower plastic 50 are assembled, the first guide surface 171 and the third guide surface 561 are inclined surfaces or arc surfaces, so that the first sealing ring 41 can be guided, the first sealing ring 41 can be ensured to be completely positioned in the first accommodating gap A, and poor sealing performance caused by the matching dislocation of the first sealing ring 41 and the first pole 21 is avoided. The outer circumferential surface of the first sealing ring 41 abuts against the hole wall of the first assembly hole 56 of the lower plastic 50, and is disposed opposite to the third guiding surface 561 at a distance. The first insulating surface 411 of the first seal ring 41 abuts against the first groove bottom wall 132 of the first mounting groove 13, and the second insulating surface 412 is disposed opposite to the first groove bottom wall 132.

The second seal ring 42 in this embodiment is the same as the first seal ring 41 in this embodiment, the second seal ring 42 in this embodiment is the second seal ring 42 shown in fig. 12B, the second seal ring 42 includes a second convex ring 426 protruding from the inner periphery of the second seal flange 425, and accordingly, the height of the second extension portion 322 of the second upper plastic 32 is shortened. The second seal ring 42 also includes a second void 427. In other embodiments, the second seal ring 42 and the first seal ring 41 may also be different.

Specifically, the second seal ring 42 is accommodated in the second accommodation gap B, and is also accommodated in the second assembly hole 57 of the lower plastic 50. The second seal ring 42 surrounds the portion of the second post 22 protruding from the second upper plastic 32 and surrounds the second guide projection 18. It will be appreciated that the second body 222 of the second post 22 passes through the second sealing hole 424 of the second sealing ring 42, i.e. the second sealing ring 42 is directly sleeved on the second body 222. The fourth side 4263 of the second convex ring 426 of the second seal ring 42 is spaced from the outer peripheral surface of the second body 222, so that a more sufficient space is ensured for filling the second seal ring 42 during deformation, thereby releasing stress and improving the sealing performance of the end cap assembly 100. The second collar 426 is located between the second extension 322 and the second press block 62. The second collar 426 protrudes from the second mounting groove 14 of the end cap 10 and is received in the second mounting hole 16. The second top surface 4261 of the second convex ring 426 abuts against the end surface of the second extension portion 322 facing away from the second body 321. The third side 4262 of the second collar 426 abuts the wall of the second mounting hole 16 of the end cap 10. The second guide surface 181 of the end cap 10 faces away from the third side 4262 and is disposed opposite the second inner annular surface 423. The second recess 427 of the second seal ring 42 is disposed toward the end cap 10 and is configured to receive the second guide projection 18 of the end cap 10 to locate the second seal ring 42 during installation. When the second pressing block 62 presses the second pole 22, the second sealing ring 42 is pressed and fills the second gap 427, so that on one hand, the gap between the second upper plastic 32 and the second pole 22 can be closed, and the sealing effect is ensured, and on the other hand, the path of the electrolyte in the energy storage device 1000 penetrating outwards can be prolonged, so that the sealing performance is further improved.

In the thickness direction of the end cap assembly 100, the second seal ring 42 is clamped between the second press block 62 and the end cap 10, the second seal ring 42 is positioned in the second mounting groove 14, and the second convex ring 426 extends away from the second press block 62. When the end cover 10 and the lower plastic 50 are assembled, the second guide surface 181 and the fourth guide surface 571 are inclined surfaces or arc surfaces, so that the second sealing ring 42 can be guided, the second sealing ring 42 can be ensured to be completely positioned in the second accommodating gap B, and poor sealing performance caused by the matching dislocation of the second sealing ring 42 and the second pole 22 is avoided. The outer circumferential surface of the second sealing ring 42 abuts against the hole wall of the second assembly hole 57 of the lower plastic 50 and is disposed opposite to the fourth guiding surface 571 at a distance. The first insulating surface 411 of the second seal ring 42 abuts against the second groove bottom wall 142 of the second mounting groove 14, and the fourth insulating surface 422 is disposed opposite to the second groove bottom wall 142.

In this embodiment, design an inclined plane step respectively on first utmost point post 21 and second utmost point post 22 surface to when first briquetting 61 and second briquetting 62 are assembled respectively, the inclined plane step of first utmost point post 21 receives the extrusion and produces certain deformation, thereby realize the effect of compressing tightly of first briquetting 61 to first utmost point post 21, eliminate the clearance between first utmost point post 21 and the first briquetting 61, the inclined plane step of second utmost point post 22 receives the extrusion and produces certain deformation, thereby realize the effect of compressing tightly of second briquetting 62 to second utmost point post 22, eliminate the clearance between second utmost point post 22 and the second briquetting 62, reduced the welding smog invasion end cover subassembly 100 that produces in the welding process and lead to the risk of end cover subassembly 100 internal insulation withstand voltage not enough, guaranteed the security performance of energy memory 1000.

The first guide protrusion 17 and the second guide protrusion 18 are provided on the end cap assembly, and the third guide surface 561 and the fourth guide surface 571 are provided corresponding to the first assembly hole 56 and the second assembly hole 57 of the lower plastic 50, respectively. The first guide surface 171 and the third guide surface 561 of the first guide protrusion 17 are disposed opposite to each other and form a first receiving gap a, i.e., a "horn" type guide structure is formed between the end cap 10 and the lower plastic 50. When the first sealing ring 41 is installed in the end cover 10 and the lower plastic 50, the first guiding surface 171 and the third guiding surface 561 are inclined surfaces or arc surfaces, so that the installation of the first sealing ring 41 can be guided, the first sealing ring 41 can be ensured to be completely positioned in the first accommodating gap A, poor sealing performance of the end cover assembly 100 caused by the matching dislocation of the first sealing ring 41 and the first pole 21 is avoided, the assembly efficiency and the yield of the end cover assembly 100 are improved, and the safety performance of the energy storage device 1000 is also improved. The second guide surface 181 and the fourth guide surface 571 of the second guide projection 18 are disposed opposite to each other and form a second receiving space B, i.e., a "horn" type guide structure is formed between the end cap 10 and the lower plastic 50. When the first sealing ring 41 is installed in the end cover 10 and the lower plastic 50, the first guiding surface 171 and the third guiding surface 561 are inclined surfaces or arc surfaces, so that the installation of the first sealing ring 41 can be guided, the second sealing ring 42 can be ensured to be completely positioned in the second accommodating gap B, poor sealing performance of the end cover assembly 100 caused by the matching dislocation of the second sealing ring 42 and the second pole 22 is avoided, the assembly efficiency and the yield of the end cover assembly 100 are improved, and the safety performance of the energy storage device 1000 is also improved.

The first sealing flange 415 and the second sealing flange 425 are respectively arranged on the first sealing ring 41 and the second sealing ring 42, the first sealing flange 415 isolates the end cover 10 and the first pressing block 61, the second sealing flange 425 isolates the end cover 10 and the second pressing block 62, metal wires generated at the edges of the end cover 10, the first pressing block 61 and the second pressing block 62 can be prevented from falling into the end cover assembly 100, the internal short circuit of a pole core is prevented from being caused, and the safety performance of the energy storage device 1000 is enhanced. While extending the path for the electrolyte within the energy storage device 1000 to permeate outward, thereby further increasing the sealing performance.

On the basis of the first sealing flange 415 and the second sealing flange 425, a first convex ring 416 and a second convex ring 426 are further added respectively, the first convex ring 416 blocks the end cover 10 and the first pole column 21, the resistivity and the creepage distance between the end cover 10 and the first pole column 21 are increased, a first side face 4162 of the first convex ring 416, the surface of the first sealing flange 415 and a first gap 417 surrounded by the first inner annular face 413 accommodate the first guide protrusion 17, so that a positioning effect is achieved when the first sealing ring 41 is installed, the second convex ring 426 blocks the end cover 10 and the second pole column 22, the resistivity and the creepage distance between the end cover 10 and the second pole column 22 are increased, and the pressure resistance between structural members in the end cover assembly 100 is improved. The second guide protrusion 18 is received by the second space 427 defined by the third side 4262 of the second collar 426, the surface of the second sealing flange 425, and the second inner annular surface 423, thereby positioning the second seal ring 42 during installation and improving the installation stability of the end cap assembly 100.

The above is only a part of examples and embodiments of the present application, and the scope of the present application is not limited thereto, and any person skilled in the art who is familiar with the technical scope of the present application can easily think about the changes or substitutions, and all the changes or substitutions are covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An end cap assembly for an energy storage device, the end cap assembly comprising: an end cover, a pole, an upper plastic, a sealing ring, a lower plastic and a pressing block,

The lower plastic comprises an assembly hole, the assembly hole penetrates through two surfaces in the thickness direction of the lower plastic, a second guide surface is formed on the hole wall of the assembly hole, the second guide surface and the first guide surface are oppositely arranged and form an accommodating gap, the second guide surface and the first guide surface guide the sealing ring together, the sealing ring is arranged in the accommodating gap along the second guide surface and the first guide surface, and the second guide surface and the first guide surface support the sealing ring together;

The pressing block is arranged on one side of the lower plastic, which is opposite to the end cover, and is sleeved on the pole, and the sealing ring is positioned between the pressing block and the end cover along the thickness direction of the end cover assembly;

the upper plastic comprises a body and an extension part, and the extension part is connected with and protrudes out of one end of the body;

2. The end cap assembly of claim 1, wherein the sealing flange is located between the extension and the press block in a thickness direction of the end cap assembly, and the extension and the press block press the sealing flange.

3. The end cap assembly of claim 1, wherein the seal ring further comprises a collar protruding from a surface of the seal flange, the collar being spaced apart from the seal ring body along a radial direction of the seal ring and forming a gap, the guide protrusion being located in the gap, an end surface of the collar facing away from the seal flange being in abutment with an end of the extension toward the press block along a thickness direction of the end cap assembly.

4. The end cap assembly of any one of claims 1-3, wherein the first guide surface is a beveled or arcuate surface, the second guide surface is a beveled or arcuate surface, and the first guide surface and the second guide surface face the press block.

5. The end cap assembly of any one of claims 1-3, wherein the seal ring comprises an inner annular surface and an outer annular surface, the inner annular surface being spaced apart from the first guide surface and the outer annular surface being spaced apart from the second guide surface.

6. The end cap assembly of claim 1, wherein the post comprises a flange, a body coupled to a surface of one side of the flange in a height direction of the post, and a step disposed around an outer circumference of the body;

the pressing block comprises a first upper surface and a first lower surface, and the first upper surface and the first lower surface are oppositely arranged along the thickness direction of the pressing block; the pressing block is sleeved on the pole, the first lower surface is propped against the step, and the step surface is completely propped against the first lower surface.

7. The end cap assembly of claim 6, wherein the pressure block is welded to the pole, the step surface is deformed away from the edge of the body toward the flange, and an included angle between the step surface and the body is between 85-90 degrees.

8. The end cap assembly of claim 6, wherein the post comprises a first metal portion and a second metal portion, the first metal portion covering a side of the second metal portion facing away from the flange of the post, the step being formed in the first metal portion; the first metal part and the second metal part are formed through stamping, the first metal part is made of copper materials, and the second metal part is made of aluminum materials.

9. The end cap assembly of claim 1, wherein the lower plastic comprises a third surface and a fourth surface, the third surface and the fourth surface being disposed opposite one another in a thickness direction of the lower plastic, the lower plastic further comprising a relief groove recessed from the fourth surface toward the third surface and protruding from the third surface to form a boss,

10. An energy storage device comprising a housing, a battery cell and an end cap assembly as claimed in any one of claims 1 to 9, said housing comprising an opening and a receiving cavity, said battery cell being received in said housing, said end cap assembly being sealed to said opening,

the battery cell comprises a tab, and the tab is connected with the pole.

11. A powered device comprising the energy storage device of claim 10, the energy storage device configured to power the powered device.