Pole assembly, top cover assembly, energy storage device and power utilization system

Abstract

The invention discloses a pole assembly, a top cover assembly, an energy storage device and a power utilization system. The pole assembly comprises a connecting piece, an upper insulating piece, a pole, a sealing ring, an insulating supporting piece and a pressing ring. Wherein the connecting piece is provided with a first surface, a second surface and a first through hole penetrating through the first surface and the second surface; the upper insulating part is arranged on the first surface and is provided with a second through hole opposite to the first through hole; the second end of the pole sequentially penetrates through the second through hole and the first through hole, and the first end extends in the radial direction of the pole to form a flange abutting against the upper insulating part; the sealing ring is positioned between the flange and the connecting piece along the axial direction of the pole and is positioned between the pole and the hole wall of the second through hole along the radial direction of the pole; the insulating support piece is arranged on the second surface, is provided with a third through hole opposite to the first through hole, and sleeves the pole through the third through hole; the pressing ring is connected to the second end and abuts against the face, away from the second surface, of the insulating supporting piece, so that the sealing ring is pressed to be sealed between the flange and the connecting piece.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole assembly, a top cover assembly, an energy storage device and an electricity system. Background Art

[0002] Rechargeable batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged to activate the active materials and continue to be used after the battery is discharged. Due to its recyclable characteristics, secondary batteries have gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people have higher requirements for their energy density, reliability and cost.

[0003] In the production of secondary batteries, a sealing ring is generally used to insulate and seal the gap between the pole and the top cover. However, during the assembly process, if the sealing ring is damaged, skewed, or fibers are mixed between the sealing ring and the top cover, it is very easy to cause poor sealing of the secondary battery. The sealing test of the secondary battery is generally carried out after the top cover assembly, shell and battery cell are assembled, and once poor airtightness is detected, the assembled secondary battery will be scrapped, resulting in the scrapping of the lower insulating part, explosion-proof valve, top cover, etc. assembled into the secondary battery, causing waste and being unfavorable to the control of the production cost of the secondary battery. Summary of the invention

[0004] The present application discloses a pole assembly, a top cover assembly, an energy storage device and an electric system. The pole assembly can detect the air tightness of the sealing ring in advance during the manufacturing process of the secondary battery, effectively reducing the loss of other materials such as the top cover, the lower insulating member and the explosion-proof valve, reducing the production cost, and enabling the pole assembly to be modularly designed, thereby improving versatility.

[0005] In order to achieve the above objectives, in a first aspect, the present application discloses a pole assembly, comprising:

[0006] A connecting member, the connecting member having a first surface and a second surface disposed opposite to each other, and a first through hole penetrating the first surface and the second surface, the connecting member being used for fixed connection with the top cover;

[0007] An upper insulating member, the upper insulating member is disposed on the first surface, the upper insulating member has a second through hole, and the second through hole corresponds to the first through hole;

[0008] A pole, the pole having a first end and a second end, the second end passing through the second through hole and the first through hole in sequence, the first end extending along the radial direction of the pole to form a flange, the flange abutting against a surface of the upper insulating member facing away from the connecting member;

[0009] A sealing ring, wherein the sealing ring is located between the flange and the connecting member along the axial direction of the pole, and between the outer peripheral wall of the pole and the hole wall of the second through hole along the radial direction of the pole;

[0010] an insulating support member, disposed on the second surface, the insulating support member having a third through hole, the third through hole corresponding to the first through hole in the axial direction of the pole, the insulating support member being sleeved on the outer peripheral wall of the pole through the third through hole; and,

[0011] A pressure ring is connected to the second end and is pressed against a side of the insulating support member that is away from the second surface, so that the pressure ring can provide an axial squeezing force to the sealing ring along the pole, thereby enabling the sealing ring to be pressure-sealed and arranged between the flange and the connector.

[0012] In this embodiment, the flange of the pole is in contact with a surface of the upper insulating member facing away from the connecting member, the second end of the pole passes through the second through hole and the first through hole in sequence, and the insulating support member is arranged on the second surface. The pressure ring is sleeved on the outer peripheral wall of the pole, and the pressure ring is connected to the second end and pressed against the side of the insulating support member facing away from the second surface, so that the pressure ring can provide an extrusion force along the axial direction of the pole to the sealing ring, thereby enabling the sealing ring to be pressure-sealed and arranged between the flange and the connecting member, so that the connecting member, the upper insulating member, the pole, the sealing ring, the insulating support member and the pressure ring can form a whole, which can enable the pole assembly to be modularly designed, effectively improving the versatility of the pole assembly and reducing the production cost; and it can also enable the pole assembly to form a whole with good sealing performance, so that the air tightness of the sealing ring of the pole assembly can be tested, so that the pole assembly with poor sealing performance can be timely picked out from the process of the secondary battery before the pole assembly is assembled with other parts, effectively reducing the probability of poor sealing due to poor sealing of the sealing ring in the subsequent processes of the secondary battery, thereby effectively reducing the loss of other materials such as the top cover, the lower insulating member and the explosion-proof valve, and further reducing the production cost.

[0013] In some embodiments, a groove is provided on the second surface of the connecting member, and the groove penetrates the connecting member along the radial direction of the pole.

[0014] Therefore, when the pole assembly is tested for air tightness, the gas can be guided to flow to the first through hole through the groove, effectively preventing the gas from being unable to flow along the connecting piece due to excessive compression force between the connecting piece and the top cover, or between the connecting piece and other components, and avoiding the situation where the poor sealing of the sealing ring cannot be effectively identified due to the gas being unable to flow along the connecting piece to the sealing piece.

[0015] In some embodiments, there are multiple grooves, and the multiple grooves are arranged on the second surface at intervals along the circumference of the first through hole.

[0016] Therefore, when the pole assembly is tested for air tightness, the gas can flow to the sealing ring through multiple grooves, further effectively preventing the gas from being unable to effectively identify poor sealing of the sealing ring due to excessive compression force between the connector and the top cover, or between the connector and other components, so that the sealing of the sealing ring at all locations can have a better detection effect.

[0017] In some embodiments, the insulating support has a third surface abutting against the second surface, and a first protrusion is protruding from the third surface. Along the radial direction of the pole, the first protrusion is located between the pole and the hole wall of the first through hole.

[0018] Thus, the first protrusion can play an insulating role between the pole and the connector. Compared with insulation through a sealing ring, the first protrusion is less likely to become skewed or fall out of the first through hole during the assembly process, which can effectively avoid affecting the performance of the secondary battery due to a short circuit between the pole and the connector.

[0019] In some embodiments, along the axial direction of the pole, the outer peripheral wall of the pole located between the flange and the pressure ring has a first planar structure, the hole wall of the third through hole has a second planar structure, and the first planar structure abuts against the second planar structure;

[0020] The hole wall of the first through hole has a third planar structure, and the peripheral wall of the insulating support member has a fourth planar structure, and the fourth planar structure abuts against the third planar structure.

[0021] Therefore, the contact between the pole and the hole wall of the third through hole, and between the insulating support member and the hole wall of the first through hole can be relatively sufficient, thereby effectively improving the torsional resistance of the pole.

[0022] In some embodiments, the insulating support member also has a fourth surface abutting against the pressure ring, a first positioning portion is provided on the fourth surface, and a second positioning portion is provided on the side of the pressure ring facing the fourth surface, and the first positioning portion and the second positioning portion cooperate to position the pressure ring and the insulating support member along the radial direction of the pole.

[0023] Therefore, the first positioning portion cooperates with the second positioning portion to effectively prevent the pressure ring and the insulating support from moving relative to each other along the radial direction of the pole, making the assembly between the pressure ring and the insulating support simple and quick, thereby improving the assembly efficiency of the pole assembly.

[0024] In some embodiments, the first positioning portion includes a first annular positioning protrusion, the second positioning portion includes a first annular positioning groove, and the first annular positioning protrusion is embedded in the first annular positioning groove; and / or,

[0025] The first positioning portion includes a second annular positioning groove, the second positioning portion includes a second annular positioning protrusion, and the second annular positioning protrusion is embedded in the second annular positioning groove.

[0026] Therefore, the structures of the first positioning portion and the second positioning portion can be made simpler and easier to implement.

[0027] In some embodiments, a plurality of side ear structures are provided on the outer peripheral wall of the sealing ring, and the plurality of side ear structures are arranged at intervals along the circumference of the sealing ring, and the side ear structures abut against the hole wall of the second through hole.

[0028] Therefore, by providing a plurality of side ear structures on the outer peripheral wall of the sealing ring, the sealing ring can be effectively prevented from moving radially along the pole during assembly, thereby reducing the probability of the sealing ring being installed crookedly and improving the sealing stability of the sealing ring.

[0029] In some embodiments, the connector is an aluminum connector.

[0030] Therefore, when the material of the top cover is aluminum or aluminum alloy, the connection piece and the top cover can be welded by aluminum-aluminum welding, so that the welding between the connection piece and the top cover is not easily affected by welding pinholes, molten pool splashing, etc., which may affect the air tightness.

[0031] In some embodiments, a second protrusion is disposed on the first surface, and the second protrusion abuts against an outer peripheral wall of the upper insulating member along a radial direction of the pole.

[0032] Therefore, the second protrusion can play a positioning role, which facilitates the assembly of the connecting piece and improves the assembly efficiency of the pole assembly.

[0033] In some embodiments, two planes parallel to each other are arranged on the outer peripheral wall of the flange, and the two planes are used to provide a clamping surface and a clamping direction for the pole assembly.

[0034] Therefore, when the pole assembly is assembled with the top cover and the lower insulating member, or when the top cover assembly is assembled with the housing of the secondary battery, the pole assembly can be conveniently clamped, thereby facilitating assembly.

[0035] In a second aspect, the present application further discloses a top cover assembly, comprising:

[0036] A top cover, the top cover having a fifth surface and a sixth surface opposite to each other, and a fourth through hole penetrating the fifth surface and the sixth surface;

[0037] a lower insulating member, the lower insulating member abutting against the sixth surface, the lower insulating member having a fifth through hole, the fifth through hole corresponding to the position of the fourth through hole; and,

[0038] The pole assembly described in any one of the first aspects, wherein the pole assembly is sequentially inserted into the fourth through hole and the fifth through hole, the connecting member is fixedly connected to the fifth surface, and the pressure ring is inserted into the fifth through hole.

[0039] Therefore, in this embodiment, before the pole assembly in the top cover assembly is assembled with the top cover and the lower insulating member, the sealing ring can be tested for air tightness, so that the pole assembly with poor air tightness can be picked out in time before assembly, thereby effectively reducing the loss of the top cover and the lower insulating member, and reducing the production cost of the secondary battery.

[0040] In some other embodiments, any one of a plurality of fixing grooves and a plurality of fixing columns is disposed on the fifth surface, and the other of the plurality of fixing grooves and the plurality of fixing columns is disposed on a surface of the lower insulating member facing the fifth surface;

[0041] The plurality of fixing posts are arranged in one-to-one correspondence with the plurality of fixing grooves, and the fixing posts are filled in the corresponding fixing grooves.

[0042] Thus, the connection between the top cover and the lower insulating member can be made more stable.

[0043] In other embodiments, the fixing groove is an undercut groove.

[0044] Thus, the fixing column can be firmly fixed in the fixing groove, so that the connection between the top cover and the lower insulating member can be more firm and stable.

[0045] In other embodiments, the plurality of fixing grooves are spaced apart along the length direction of the top cover and symmetrically arranged along the width direction of the top cover, or the plurality of fixing columns are spaced apart along the length direction of the top cover and symmetrically arranged along the width direction of the top cover.

[0046] Thus, multiple positions of the top cover can be fixedly connected to the lower insulating member, making the connection between the top cover and the lower insulating member more secure.

[0047] In some other embodiments, the hole wall of the fifth through hole has a fifth planar structure, the outer peripheral wall of the pressure ring has a sixth planar structure, and the sixth planar structure abuts against the fifth planar structure;

[0048] The pole assembly also includes an insulating support member sleeved on the pole, the insulating support member is located between the second surface and the pressure ring, and the insulating support member is passed through the fourth through hole and the fifth through hole, the outer peripheral wall of the insulating support member has a seventh planar structure, the hole wall of the fourth through hole has an eighth planar structure, and the seventh planar structure is respectively abutted against the eighth planar structure and the fifth planar structure.

[0049] Thereby, the torsional resistance of the pole can be effectively improved.

[0050] In other embodiments, a receiving groove is provided on the fifth surface, the connecting member is fixedly received in the receiving groove, and the fifth through hole is provided on the bottom wall of the receiving groove.

[0051] Therefore, when the connecting member is assembled with the top cover, it can be positioned through the accommodating groove, which facilitates the assembly of the connecting member and the top cover.

[0052] In a third aspect, the present application further discloses an energy storage device, comprising:

[0053] A housing, wherein the housing has a receiving cavity and an opening communicating with the receiving cavity;

[0054] A battery cell, the battery cell being accommodated in the accommodation cavity; and

[0055] The top cover assembly described in any one of the second aspects is sealed at the opening, and the pressure ring is electrically connected to the battery core.

[0056] The top cover assembly in the above-mentioned energy storage device is the top cover assembly in the above-mentioned second aspect, so the top cover assembly in this embodiment has the technical effect of the top cover assembly in the above-mentioned second aspect.

[0057] In a fourth aspect, the present application further discloses an electricity consumption system, comprising the energy storage device described in the third aspect.

[0058] In this embodiment, the energy storage device of the power system is the energy storage device described in the third aspect above, so the energy storage device in this embodiment has the technical effect of the energy storage device in the third aspect above.

[0059] Compared with the prior art, the beneficial effects of this application are:

[0060] In the application, the flange of the pole is in contact with a surface of the upper insulating member facing away from the connecting member, the second end of the pole passes through the second through hole and the first through hole in sequence, and the insulating support member is arranged on the second surface. The pressure ring is sleeved on the outer peripheral wall of the pole, and the pressure ring is connected to the second end and pressed against the side of the insulating support member facing away from the second surface, so that the pressure ring can provide an extrusion force along the axial direction of the pole to the sealing ring, thereby enabling the sealing ring to be pressure-sealed and arranged between the flange and the connecting member, so that the connecting member, the upper insulating member, the pole, the sealing ring, the insulating support member and the pressure ring can form a whole, which can enable the pole assembly to be modularly designed, effectively improving the versatility of the pole assembly and reducing the production cost; and it can also enable the pole assembly to form a whole with good sealing performance, so that the air tightness of the sealing ring of the pole assembly can be tested, so that the pole assembly with poor sealing performance can be timely picked out from the process of the secondary battery before the pole assembly is assembled with other parts, effectively reducing the probability of poor sealing due to poor sealing of the sealing ring in the subsequent processes of the secondary battery, thereby effectively reducing the loss of other materials such as the top cover, the lower insulating member and the explosion-proof valve, and further reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0062] Figure 1 is an exploded view of a pole assembly provided in an embodiment of the present application;

[0063] Figure 2 is a stereogram of a pole assembly provided in an embodiment of the present application;

[0064] Figure 3 is a cross-sectional view of a pole assembly provided in an embodiment of the present application;

[0065] Figure 4 yes Figure 3 A magnified image of the position A in the middle;

[0066] Figure 5 is a stereoscopic diagram of a connector provided in an embodiment of the present application;

[0067] Figure 6 is a three-dimensional diagram of an insulating support member provided in an embodiment of the present application;

[0068] Figure 7 This is a three-dimensional diagram of an insulating support member provided in an embodiment of the present application after being flipped at a certain angle;

[0069] Figure 8 is a stereogram of a pressure ring provided in an embodiment of the present application;

[0070] Fig. 9 is a three-dimensional diagram of a sealing ring provided in an embodiment of the present application;

[0071] Fig.10 This is a schematic diagram of the structure of a sealing ring and an upper insulating member after being assembled according to an embodiment of the present application;

[0072] Fig.11 This is a three-dimensional diagram of a connecting member provided in an embodiment of the present application after being flipped at a certain angle;

[0073] Fig.12 is a stereogram of a pole provided in an embodiment of the present application;

[0074] Fig.13 is an exploded view of a top cover assembly provided in an embodiment of the present application;

[0075] Fig.14 is a cross-sectional view of a top cover assembly provided in an embodiment of the present application;

[0076] Fig.15 is a partial enlarged view of a lower insulating member provided in an embodiment of the present application;

[0077] Fig.16 is an exploded diagram of an energy storage device provided in an embodiment of the present application;

[0078] Fig.17 It is a schematic diagram of an electricity consumption system provided in an embodiment of the present application.

[0079] Description of reference numerals:

[0080] 1-connector; 11-first surface; 12-second surface; 13-first through hole; 14-groove; 15-second protrusion; 2-upper insulating member; 21-second through hole; 3-pole; 31-first end; 32-second end; 33-flange; 34-plane; 4-sealing ring; 41-side ear structure; 5-pressing ring; 51-second positioning portion; 6-insulating support member; 61-third through hole; 62-third surface; 63-first protrusion; 64-fourth surface; 65-first positioning portion;

[0081] 10-pole assembly; 20-top cover; 201-fifth surface; 202-sixth surface; 203-fourth through hole; 204-fixing groove; 205-accommodating groove; 30-lower insulating member; 301-fifth through hole; 302-fixing column;

[0082] 1000-power system; 100-energy storage device; 110-top cover assembly; 120-battery cell; 130-housing; 200-power conversion device; 300-power load. DETAILED DESCRIPTION

[0083] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0084] In this application, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0085] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0086] Rechargeable batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged to activate the active materials and continue to be used after being discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people have higher requirements for their energy density, reliability and cost.

[0087] Based on the problems in the above-mentioned background technology, the present application discloses a pole assembly, a top cover assembly, an energy storage device and a power consumption system. The pole assembly can detect the sealing performance of the sealing ring in advance during the manufacturing process of the secondary battery, effectively avoiding the top cover assembly with poor sealing performance from flowing into the next process of the secondary battery, reducing the loss of other materials such as the top cover, the lower insulating member and the explosion-proof valve, effectively reducing the production cost, and also enabling the pole assembly to be modularly designed, thereby improving versatility.

[0088] The technical solution of the present application will be further described below in conjunction with specific embodiments and drawings.

[0089] This embodiment provides a pole assembly, such as Figure 1-Figure 4 As shown, it includes a connector 1, an upper insulating member 2, a pole 3, a sealing ring 4, an insulating support member 6 and a pressure ring 5. Among them, the connector 1 has a first surface 11 and a second surface 12 arranged opposite to each other, and a first through hole 13 penetrating the first surface 11 and the second surface 12, and the connector 1 is used to be fixedly connected to the top cover 20; the upper insulating member 2 is arranged on the first surface 11, and the upper insulating member 2 has a second through hole 21, and the second through hole 21 corresponds to the position of the first through hole 13; the pole 3 has a first end 31 and a second end 32, and the second end 32 passes through the second through hole 21 and the first through hole 13 in sequence, and the first end 31 is radially (such as Figure 1 The flange 33 is formed by extending in the direction indicated by the X arrow in the middle, and the flange 33 abuts against the side of the upper insulating member 2 away from the connecting member 1; the sealing ring 4 is arranged along the axial direction of the pole 3 (such as Figure 1 The second end 32 is provided with a pressure ring 5, and the pressure ring 5 is pressed against a side of the insulating support member 6 which is away from the second surface 12, so that the pressure ring 5 can provide an extrusion force to the sealing ring 4 along the axial direction of the pole 3, thereby enabling the sealing ring 4 to be sealed under pressure and arranged between the flange 33 and the connector 1.

[0090] Thus, the flange 33 of the pole 3 is in contact with the side of the upper insulating member 2 facing away from the connector 1, and the second end 32 of the pole 3 passes through the second through hole 21 and the first through hole 13 in sequence, and the insulating support member 6 is arranged on the second surface 12. The pressure ring 5 is sleeved on the outer peripheral wall of the pole 3, and the pressure ring 5 is connected to the second end 32 and pressed against the side of the insulating support member 6 facing away from the second surface 12, so that the pressure ring 5 can provide an extrusion force along the axial direction of the pole 3 to the sealing ring 4, thereby enabling the sealing ring 4 to be pressurized and sealed and arranged between the flange 33 and the connector 1, so that the connector 1, the upper insulating member 2, the pole 3, the sealing ring 4, the insulating support member 6 and the pressure ring 5 can form a whole, so that the pole assembly 10 can be modularly designed, effectively improving the versatility of the pole assembly 10 and reducing production costs. production cost; and it can also enable the pole assembly 10 to form a whole with good sealing performance, so that the airtightness of the sealing ring 4 of the pole assembly 10 can be tested, so that the pole assembly 10 with poor sealing performance can be timely sorted out from the secondary battery manufacturing process before the pole assembly 10 is assembled with other parts, effectively reducing the probability of poor sealing due to poor sealing of the sealing ring 4 in the subsequent processes of the secondary battery, thereby effectively reducing the loss of other materials such as the top cover 20, the lower insulating member 30 and the explosion-proof valve, and further reducing the production cost.

[0091] In the above, the sealing ring 4 is located between the flange 33 and the connector 1 along the axial direction of the pole 3, and between the outer peripheral wall of the pole 3 and the hole wall of the second through hole 21 along the radial direction of the pole 3, so that the sealing ring 4 can be sealed between the flange 33 and the connector 1, and between the pole 3 and the upper insulating member 2. The pressure ring 5 is connected to the second end 32, and is pressed against the side of the insulating support member 6 away from the second surface 12, so that the pressure ring 5 can provide the sealing ring 4 with an extrusion force along the axial direction of the pole 3, so that the sealing ring 4 can be deformed along the axial direction of the pole 3 and the radial direction of the pole 3, and then the sealing ring 4 can be compressed and sealed between the flange 33 and the connector 1, so that the sealing performance of the sealing ring 4 can be better, and the yield rate of the pole assembly 10 is effectively improved.

[0092] The material of the upper insulating member 2 may be at least one of ethylene-tetrafluoroethylene copolymer, polyethylene terephthalate, polyphenylene sulfide or ceramics, and is not limited here.

[0093] It should be explained that the above-mentioned insulating support member 6 refers to an insulating member made of a relatively hard material that is not easily compressed and deformed, so as to play a supporting role between the second surface 12 and the pressure ring 5 .

[0094] Thus, the insulating support member 6 is disposed on the second surface 12, and the pressure ring 5 is pressed against the side of the insulating support member 6 that is away from the second surface 12, that is, the insulating support member 6 is located between the connector 1 and the pressure ring 5, and can play an insulating role between the connector 1 and the pressure ring 5, thereby avoiding the performance of the secondary battery being affected by a short circuit between the connector 1 and the pressure ring 5. Moreover, compared with insulation through a relatively soft insulating pad, the influence on the compression amount of the sealing ring 4 can be effectively reduced, thereby being conducive to improving the sealing effect of the sealing ring 4.

[0095] The insulating support member 6 may be made of an insulating material that is not easily deformed by compression, such as at least one of polyvinyl chloride, polytetrafluoroethylene, polyphenylene sulfide, bakelite, etc., which is not limited here.

[0096] Alternatively, if Figure 4 and Figure 5 As shown, a groove 14 is provided on the second surface 12 of the connecting member 1 , and the groove 14 penetrates the connecting member 1 along the radial direction of the pole 3 .

[0097] It should be explained that the groove 14 passing through the connector 1 along the radial direction of the pole 3 means that the groove 14 passing through the outer peripheral wall of the connector 1 and the hole wall of the first through hole 13 along the radial direction of the pole 3 .

[0098] Therefore, when the pole assembly 10 is tested for air tightness, the gas can be guided to flow to the first through hole 13 through the groove 14, so that the gas can quickly reach the sealing ring 4 along the gap between the hole wall of the first through hole 13 and the pole 3, effectively preventing the gas from being unable to flow along the connector 1 due to excessive compression between the connector 1 and the top cover 20, or between the connector 1 and other components, and avoiding the situation where the poor sealing of the sealing ring 4 cannot be effectively identified due to the inability of the gas to flow along the connector 1, thereby improving the detection effect and efficiency of the sealing performance of the sealing ring 4, thereby further reducing the probability of poor sealing due to poor sealing of the sealing ring 4 in subsequent processes of the secondary battery, and further reducing the loss of other materials such as the top cover 20, the lower insulating member 30 and the explosion-proof valve.

[0099] The cross-sectional shape of the groove 14 can be any one of a rectangular, trapezoidal, semicircular, triangular, etc., which is not limited here.

[0100] In addition, there are multiple grooves 14 , and the multiple grooves 14 are arranged on the second surface 12 at intervals around the first through hole 13 .

[0101] Therefore, when the pole assembly 10 is tested for air tightness, the gas can flow to the sealing ring 4 through the multiple grooves 14, further effectively preventing the gas from being unable to effectively identify poor sealing of the sealing ring 4 due to excessive compression between the connector 1 and the top cover 20, or between the connector 1 and other components, so that the sealing of the sealing ring 4 at all locations can have a better detection effect.

[0102] The number of the grooves 14 may be two, three or more, which is not limited here.

[0103] In addition, a plurality of grooves 14 may be evenly spaced around the first through hole 13 on the second surface 12 , so that the gas passing through the grooves 14 can reach all parts of the sealing ring 4 more evenly, thereby achieving a better sealing detection effect of the sealing ring 4 .

[0104] Alternatively, if Figure 4 and Figure 6 As shown, the insulating support member 6 has a third surface 62 abutting against the second surface 12 , and a first protrusion 63 is protruded on the third surface 62 . Along the radial direction of the pole 3 , the first protrusion 63 is located between the pole 3 and the hole wall of the first through hole 13 .

[0105] Thus, the first protrusion 63 can play an insulating role between the pole 3 and the connector 1. Compared with insulation through the sealing ring 4, the first protrusion 63 is less likely to be skewed or fall out of the first through hole 13 during the assembly process, which can effectively avoid the performance of the secondary battery being affected by a short circuit between the pole 3 and the connector 1.

[0106] The first protrusion 63 may be lower than the first surface 11 along the radial direction of the pole 3 , or may be flush with the first surface 11 , or may extend out of the first through hole 13 , which is not limited here.

[0107] In some embodiments, Figure 4 , Figure 7 and Figure 8 As shown, the insulating support 6 also has a fourth surface 64 abutting against the pressure ring 5, and a first positioning portion 65 is provided on the fourth surface 64. A second positioning portion 51 is provided on the side of the pressure ring 5 facing the fourth surface 64. The first positioning portion 65 cooperates with the second positioning portion 51 to position the pressure ring 5 and the insulating support 6 along the radial direction of the pole 3.

[0108] Therefore, by cooperating with the first positioning portion 65 and the second positioning portion 51 , the pressure ring 5 and the insulating support member 6 can be effectively prevented from relative movement along the radial direction of the pole 3 , making the assembly between the pressure ring 5 and the insulating support member 6 simple and quick, thereby improving the assembly efficiency of the pole assembly 10 .

[0109] Among them, the first positioning portion 65 includes a first annular positioning protrusion, the second positioning portion 51 includes a first annular positioning groove, and the first annular positioning protrusion is embedded in the first annular positioning groove; or, the first positioning portion 65 includes a second annular positioning groove, the second positioning portion 51 includes a second annular positioning protrusion, and the second annular positioning protrusion is embedded in the second annular positioning groove; or, the first positioning portion 65 includes a first annular positioning protrusion and a second annular positioning groove, the second positioning portion 51 includes a first annular positioning groove and a second annular positioning protrusion, the first annular positioning protrusion is embedded in the first annular positioning groove, and the second annular positioning protrusion is embedded in the second annular positioning groove.

[0110] Therefore, the structures of the first positioning portion 65 and the second positioning portion 51 can be made simpler and easier to implement.

[0111] The annular positioning protrusion can be any one of a circular annular positioning protrusion, a pentagonal annular positioning protrusion, a hexagonal annular positioning protrusion, etc., which is not limited here. Correspondingly, the annular positioning groove can be any one of a circular annular positioning groove, a pentagonal annular positioning groove, a hexagonal annular positioning groove, etc., which is not limited here.

[0112] Optionally, along the axial direction of the pole 3, the outer peripheral wall of the pole 3 located between the flange 33 and the pressure ring 5 has a first planar structure, the hole wall of the third through hole 61 has a second planar structure, and the first planar structure abuts the second planar structure; the hole wall of the first through hole 13 has a third planar structure, and the outer peripheral wall of the insulating support 6 has a fourth planar structure, and the fourth planar structure abuts the third planar structure.

[0113] As a result, the contact between the pole 3 and the hole wall of the third through hole 61, and between the insulating support 6 and the hole wall of the first through hole 13 can be relatively sufficient. When the pole 3 is subjected to torque, the torque can be transmitted to the insulating support 6 and then to the connector 1, thereby effectively improving the torsional resistance of the pole 3.

[0114] The first plane structure may be any one of a quadrilateral plane structure, a hexagonal plane structure, a pentagonal plane structure, etc., which is not limited here. The second plane structure may be a plane structure adapted to the first plane.

[0115] The structures of the third planar structure and the fourth planar structure may be substantially the same as that of the first planar structure. For details, please refer to the above, and no further details will be given here.

[0116] In addition, when the first protrusion 63 is protruded on the third surface 62 along the edge of the third through hole 61, and the first protrusion 63 is arranged to form a planar structure corresponding to the second planar structure, the contact area between the insulating support 6 and the pole 3 can be effectively increased, so that when the pole 3 is subjected to torque, most of the torque can be transferred to the insulating support 6, thereby effectively improving the torsional resistance of the pole 3.

[0117] In other embodiments, Fig. 9 and Fig.10 As shown, a plurality of side ear structures 41 are arranged on the outer peripheral wall of the sealing ring 4 . The plurality of side ear structures 41 are arranged at intervals along the circumference of the sealing ring 4 . The side ear structures 41 abut against the hole wall of the second through hole 21 .

[0118] Therefore, by providing a plurality of side ear structures 41 on the outer peripheral wall of the sealing ring 4, on the one hand, the sealing ring 4 can be effectively prevented from moving radially along the pole 3 during assembly, thereby reducing the probability of the sealing ring 4 being installed crookedly; on the other hand, a gap can be provided between the sealing ring 4 and the wall of the second through hole 21 along the radial direction of the pole 3, thereby providing the sealing ring 4 with a deformation space along the radial direction of the pole 3.

[0119] The shape of the side ear structure 41 can be any one of a semicircular structure, a trapezoidal structure, a rectangular structure, etc., which is not limited here.

[0120] In addition, a plurality of side ear structures 41 can be evenly arranged on the outer peripheral wall of the sealing ring 4 along the circumference of the sealing ring 4, which can make the sealing ring 4 less likely to move along the radial direction of the pole 3, further reducing the probability of the sealing ring 4 being installed crooked.

[0121] As mentioned above, the connecting piece 1 is an aluminum connecting piece.

[0122] Therefore, when the material of the top cover 20 is aluminum or aluminum alloy, the connecting part 1 and the top cover 20 can be aluminum-aluminum welded. The melting point of aluminum is relatively low, so the welding between the connecting part 1 and the top cover 20 can be of higher quality and is not easily affected by the occurrence of welding pinholes, molten pool splashes, etc., which may affect the airtightness.

[0123] In some embodiments, Figure 4 and Fig.11 As shown, a second protrusion 15 is provided on the first surface 11 , and the second protrusion 15 abuts against the outer peripheral wall of the upper insulating member 2 along the radial direction of the pole 3 .

[0124] Thus, the second protrusion 15 can play a positioning role, which facilitates the assembly of the connector 1 and improves the assembly efficiency of the pole assembly 10. In addition, when the secondary battery equipped with the pole assembly 10 is injected, the electrolyte can be effectively prevented from flowing to the pole 3, which effectively improves the performance of the battery.

[0125] The second protrusion 15 may be an annular protrusion, or may include a plurality of protrusions, and the plurality of protrusions are arranged at intervals around the first through hole 13, which is not limited here.

[0126] In other embodiments, Figure 2 and Fig.12 As shown, two planes 34 parallel to each other are arranged on the outer peripheral wall of the flange 33 , and the two planes 34 are used to provide a clamping surface and a clamping direction for the pole assembly 10 .

[0127] Therefore, when the pole assembly 10 is assembled with the top cover 20 and the lower insulating member 30 , or when the top cover assembly 110 is assembled with the housing 130 of the secondary battery, the pole assembly 10 can be conveniently clamped, thereby facilitating assembly.

[0128] A recessed groove may be provided on the surface of the upper insulating member 2 facing the first end 31, and the second through hole 21 may be provided on the bottom wall of the recessed groove. The bottom wall of the recessed groove abuts against a surface of the flange 33 facing the second end 32, and the side wall of the recess abuts against a portion of the outer peripheral wall of the flange 33, so as to play a certain positioning role in the installation of the upper insulating member 2, thereby facilitating the installation between the upper insulating member 2 and the pole 3.

[0129] The present application also provides a top cover assembly 110, such as Fig.13 and Fig.14 As shown, it includes a top cover 20, a lower insulating member 30 and any one of the pole assembly 10 described in the above embodiments. The top cover 20 has a fifth surface 201 and a sixth surface 202 opposite to each other, and a fourth through hole 203 penetrating the fifth surface 201 and the sixth surface 202; the lower insulating member 30 abuts against the sixth surface 202, and the lower insulating member 30 has a fifth through hole 301, and the fifth through hole 301 corresponds to the fourth through hole 203; and the pole assembly 10 is sequentially penetrated through the fourth through hole 203 and the fifth through hole 301, the connector 1 is fixedly connected to the fifth surface 201, and the pressure ring 5 is penetrated through the fifth through hole 301.

[0130] Therefore, before the pole assembly 10 in the top cover assembly 110 is assembled with the top cover 20 and the lower insulating member 30, the sealing ring 4 can be tested for air tightness, so that the pole assembly 10 with poor air tightness can be sorted out in time before assembly, thereby effectively reducing the loss of the top cover 20 and the lower insulating member 30, etc., and reducing the production cost of the secondary battery.

[0131] In addition, the pole assembly 10 in the top cover assembly 110 is the pole assembly 10 described in any one of the above-mentioned embodiments. Therefore, the pole assembly 10 in this embodiment has the technical effects of the pole assembly 10 in the above-mentioned embodiments. Since the above-mentioned embodiments have fully explained the technical effects of the pole assembly 10, they will not be repeated here.

[0132] The pressure ring 5 is inserted into the fifth through hole 301 , and the outer peripheral surface of the pressure ring 5 may be located in the fifth through hole 301 , or the outer peripheral surface of the pressure ring 5 may be partially located in the fifth through hole 301 , which is not limited here.

[0133] Alternatively, if Fig.13 and Fig.15 As shown, any one of the plurality of fixing grooves 204 and the plurality of fixing columns 302 is provided on the fifth surface 201, and the other one of the plurality of fixing grooves 204 and the plurality of fixing columns 302 is provided on the side of the lower insulating member 30 facing the fifth surface 201; the plurality of fixing columns 302 are provided in one-to-one correspondence with the plurality of fixing grooves 204, and the fixing columns 302 are filled in the corresponding fixing grooves 204.

[0134] Thus, the connection between the top cover 20 and the lower insulating member 30 can be made more stable, so that when the top cover assembly 110 is subsequently assembled with the shell 130 and the battery cell 120, the top cover 20 and the lower insulating member 30 are not prone to shaking, which is beneficial to improving the assembly quality and the performance of the secondary battery.

[0135] Among them, the fixing column 302 can be filled into the fixing groove 204 by ultrasonic hot melting, which can make the connection between the fixing column 302 and the fixing groove 204 easy to achieve; or the fixing column 302 can be an elastic column, and the fixing column 302 is squeezed and filled into the fixing groove 204. This is not limited here, as long as the fixing column 302 can be filled into the fixing groove 204.

[0136] The number of the fixing slots 204 may be two, three or more, which is not limited here. Correspondingly, the number of the fixing posts 302 may be two, three or more, which is not limited here.

[0137] The fixing groove 204 mentioned above may have multiple implementations. In one possible implementation, the fixing groove 204 may be a cylindrical groove, which has a simple structure and is easy to implement.

[0138] In another implementation of the fixing slot 204, as Fig.15 As shown, the fixing groove 204 is an undercut groove, so that the fixing column 302 can be firmly fixed in the fixing groove 204, so that the connection between the top cover 20 and the lower insulating member 30 can be more firm and stable.

[0139] Optionally, a plurality of fixing grooves 204 are arranged at intervals along the length direction of the top cover 20 and are symmetrically arranged along the width direction of the top cover 20, or a plurality of fixing columns 302 are arranged at intervals along the length direction of the top cover 20 and are symmetrically arranged along the width direction of the top cover 20. Thus, multiple positions of the top cover 20 can be fixedly connected to the lower insulating member 30, so that the connection between the top cover 20 and the lower insulating member 30 is more secure.

[0140] In some embodiments, the hole wall of the fifth through hole 301 has a fifth planar structure, the outer peripheral wall of the pressure ring 5 has a sixth planar structure, and the sixth planar structure abuts against the fifth planar structure; the pole assembly 10 also includes an insulating support 6 sleeved on the pole 3, the insulating support 6 is located between the second surface 12 and the pressure ring 5, and the insulating support 6 is passed through the fourth through hole 203 and the fifth through hole 301, the outer peripheral wall of the insulating support 6 has a seventh planar structure, and the hole wall of the fourth through hole 203 has an eighth planar structure, and the seventh planar structure abuts against the eighth planar structure and the fifth planar structure respectively.

[0141] Therefore, the torque applied to the pole 3 can be transmitted to the lower insulating member 30 through the pressure ring 5, and can also be transmitted to the top cover 20 and the lower insulating member 30 through the insulating support member 6, thereby effectively improving the torsional resistance of the pole 3.

[0142] The fifth planar structure may be any one of a quadrilateral planar structure, a hexagonal planar structure, a pentagonal planar structure, etc., which is not limited here. The sixth planar structure may be a planar structure that matches the fifth planar structure.

[0143] The structures of the seventh planar structure and the eighth planar structure may be substantially the same as that of the fifth planar structure. For details, reference may be made to the above description and will not be repeated herein.

[0144] In other embodiments, Fig.13 As shown, a receiving groove 205 is provided on the fifth surface 201 , the connecting member 1 is fixedly received in the receiving groove 205 , and the fifth through hole 301 is provided on the bottom wall of the receiving groove 205 .

[0145] Therefore, when the connecting member 1 is assembled with the top cover 20 , it can be positioned by the receiving groove 205 , which facilitates the assembly of the connecting member 1 and the top cover 20 .

[0146] The connecting member 1 is fixed in the receiving groove 205 . The connecting member 1 may be welded in the receiving groove 205 , or the connecting member 1 may be bonded in the receiving groove 205 , which is not limited here.

[0147] In addition, the groove side wall of the accommodating groove 205 may have a ninth planar structure, and the outer peripheral wall of the connecting member 1 may have a tenth planar structure. The ninth planar structure and the tenth planar structure abut against each other along the radial direction of the pole 3, so that the torque applied to the pole 3 can also be transmitted to the top cover 20 through the connecting member 1, thereby improving the torsional resistance of the pole 3.

[0148] The present application also provides an energy storage device, such as Fig.16 As shown, it includes a housing 130, a battery cell 120 and a top cover assembly 110 according to any one of the above embodiments. The housing 130 has a receiving cavity and an opening connected to the receiving cavity; the battery cell 120 is received in the receiving cavity; and the top cover assembly 110 is sealed and arranged at the opening, and the pressure ring 5 is electrically connected to the battery cell 120.

[0149] The top cover assembly 110 in the above-mentioned energy storage device 100 is the top cover assembly 110 in the above-mentioned embodiments. Therefore, the top cover assembly 110 in this embodiment has the technical effects of the top cover assembly 110 in the above-mentioned embodiments. Since the above-mentioned embodiments have fully explained the technical effects of the top cover assembly 110, they will not be repeated here.

[0150] The energy storage device 100 may include any one of a secondary battery, a battery pack, a battery module, a battery cluster, etc., which is not limited here.

[0151] The present application also provides an electricity system, such as Fig.17 As shown, it includes the energy storage device 100 described in any one of the above embodiments.

[0152] In this embodiment, the energy storage device 100 of the power system 1000 is the energy storage device 100 described in the above embodiment. Therefore, the energy storage device 100 in this embodiment has the technical effect of the energy storage device 100 in the above embodiment. Since the above embodiment has fully described the technical effect of the energy storage device 100, it will not be repeated here.

[0153] In addition, the power system 1000 may also include an electric energy conversion device 200 and an electric load 300. The electric energy conversion device 200 is used to convert other forms of energy into electric energy. The energy storage device 100 can store at least part of the electric energy converted by the electric energy conversion device 200. The energy storage device 100 is also used to provide electric energy to the electric load 300. For example, the electric load 300 is household appliances and street lights. When the power grid is disconnected or there is a power outage, the energy storage device 100 can supply power to the household appliances and street lights.

[0154] In addition, the electric energy conversion device 200 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electric energy. The electric energy conversion device 200 can be a solar panel, a windmill, a geothermal power generation device, etc.

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pole assembly, characterized in that: include: A connecting member, the connecting member having a first surface and a second surface disposed opposite to each other, and a first through hole penetrating the first surface and the second surface, the connecting member being used for fixed connection with the top cover; An upper insulating member, the upper insulating member is disposed on the first surface, the upper insulating member has a second through hole, and the second through hole corresponds to the first through hole; A pole, the pole having a first end and a second end, the second end passing through the second through hole and the first through hole in sequence, the first end extending along the radial direction of the pole to form a flange, the flange abutting against a surface of the upper insulating member facing away from the connecting member; A sealing ring, wherein the sealing ring is located between the flange and the connecting member along the axial direction of the pole, and between the outer peripheral wall of the pole and the hole wall of the second through hole along the radial direction of the pole; an insulating support member, disposed on the second surface, the insulating support member having a third through hole, the third through hole corresponding to the first through hole in the axial direction of the pole, the insulating support member being sleeved on the outer peripheral wall of the pole through the third through hole; and, A pressure ring is connected to the second end and is pressed against a side of the insulating support member that is away from the second surface, so that the pressure ring can provide an axial squeezing force to the sealing ring along the pole, thereby enabling the sealing ring to be pressure-sealed and arranged between the flange and the connector.

2. The pole assembly according to claim 1, characterized in that: A groove is provided on the second surface of the connecting member, and the groove penetrates the connecting member along the radial direction of the pole.

3. The pole assembly according to claim 2, characterized in that: There are multiple grooves, and the multiple grooves are arranged on the second surface at intervals along the circumferential direction of the first through hole.

4. The pole assembly according to claim 1, characterized in that: The insulating support member has a third surface abutting against the second surface, and a first protrusion is protruding from the third surface. Along the radial direction of the pole, the first protrusion is located between the pole and the hole wall of the first through hole.

5. The pole assembly according to claim 4, characterized in that: Along the axial direction of the pole, the outer peripheral wall of the pole located between the flange and the pressure ring has a first plane structure, the hole wall of the third through hole has a second plane structure, and the first plane structure abuts against the second plane structure; The hole wall of the first through hole has a third planar structure, and the peripheral wall of the insulating support member has a fourth planar structure, and the fourth planar structure abuts against the third planar structure.

6. The pole assembly according to claim 1, characterized in that: The insulating support also has a fourth surface abutting against the pressure ring, a first positioning portion is provided on the fourth surface, and a second positioning portion is provided on the side of the pressure ring facing the fourth surface, and the first positioning portion and the second positioning portion cooperate to position the pressure ring and the insulating support along the radial direction of the pole.

7. The pole assembly according to claim 6, characterized in that: The first positioning portion includes a first annular positioning protrusion, the second positioning portion includes a first annular positioning groove, and the first annular positioning protrusion is embedded in the first annular positioning groove; and / or, The first positioning portion includes a second annular positioning groove, the second positioning portion includes a second annular positioning protrusion, and the second annular positioning protrusion is embedded in the second annular positioning groove.

8. The pole assembly according to any one of claims 1 to 7, characterized in that: A plurality of side ear structures are arranged on the outer peripheral wall of the sealing ring. The plurality of side ear structures are arranged at intervals along the circumference of the sealing ring. The side ear structures abut against the hole wall of the second through hole.

9. The pole assembly according to any one of claims 1 to 7, characterized in that: A second protrusion is disposed on the first surface, and the second protrusion abuts against the outer peripheral wall of the upper insulating member along the radial direction of the pole.

10. The pole assembly according to any one of claims 1 to 7, characterized in that: Two planes parallel to each other are arranged on the outer peripheral wall of the flange, and the two planes are used to provide a clamping surface and a clamping direction for the pole assembly.

11. A top cover assembly, characterized in that: include: A top cover, the top cover having a fifth surface and a sixth surface opposite to each other, and a fourth through hole penetrating the fifth surface and the sixth surface; a lower insulating member, the lower insulating member abutting against the sixth surface, the lower insulating member having a fifth through hole, the fifth through hole corresponding to the position of the fourth through hole; and, The pole assembly described in any one of claims 1 to 10, wherein the pole assembly is sequentially penetrated through the fourth through hole and the fifth through hole, the connecting member is fixedly connected to the fifth surface, and the pressure ring is penetrated through the fifth through hole.

12. The top cover assembly according to claim 11, characterized in that: Any one of a plurality of fixing grooves and a plurality of fixing columns is disposed on the fifth surface, and another one of the plurality of fixing grooves and the plurality of fixing columns is disposed on a surface of the lower insulating member facing the fifth surface; The plurality of fixing posts are arranged in one-to-one correspondence with the plurality of fixing grooves, and the fixing posts are filled in the corresponding fixing grooves.

13. The top cover assembly according to claim 12, characterized in that: The fixing groove is an undercut groove.

14. The top cover assembly according to claim 11, characterized in that: The hole wall of the fifth through hole has a fifth plane structure, the outer peripheral wall of the pressure ring has a sixth plane structure, and the sixth plane structure abuts against the fifth plane structure; The insulating support member is inserted into the fourth through hole and the fifth through hole, the outer peripheral wall of the insulating support member has a seventh planar structure, the hole wall of the fourth through hole has an eighth planar structure, and the seventh planar structure is respectively abutted against the eighth planar structure and the fifth planar structure.

15. The top cover assembly according to claim 11, characterized in that The fifth surface is provided with a receiving groove, the connecting member is fixedly received in the receiving groove, and the fifth through hole is provided on the bottom wall of the receiving groove.

16. An energy storage device, characterized in that: include: A housing, wherein the housing has a receiving cavity and an opening communicating with the receiving cavity; A battery cell, wherein the battery cell is accommodated in the accommodation cavity; as well as, The top cover assembly according to any one of claims 11 to 15, wherein the top cover assembly is sealed at the opening, and the pressure ring is electrically connected to the battery cell.

17. An electricity system, characterized in that: Includes the energy storage device as described in claim 16.

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