An electrode assembly, a top cover assembly, an energy storage device, and a power system.

Abstract

This application discloses a pole assembly, a top cover assembly, an energy storage device, and a power system. The pole assembly includes a connector, an upper insulating member, a pole, a sealing ring, an insulating support member, and a pressure ring. The connector has a first surface, a second surface, and a first through hole penetrating both surfaces. The upper insulating member is disposed on the first surface and has a second through hole opposite to the first through hole. The second end of the pole passes through the second through hole and the first through hole sequentially, and the first end extends radially along the pole to form a flange that abuts against the upper insulating member. The sealing ring is located axially between the flange and the connector, and radially between the pole and the wall of the second through hole. The insulating support member is disposed on the second surface and has a third through hole opposite to the first through hole, and is fitted onto the pole through the third through hole. The pressure ring is connected to the second end and presses against the side of the insulating support member facing away from the second surface, so that the sealing ring is sealed between the flange and the connector under pressure.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode assembly, a top cover assembly, an energy storage device, and an electrical system. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or storage battery, is a battery that can be recharged after being discharged, allowing the active materials to be reactivated and reused. Due to its recyclable nature, rechargeable batteries are gradually becoming a major power source for electrical devices. As the demand for rechargeable batteries increases, higher requirements are being placed on their energy density, reliability, and cost.

[0003] In the manufacturing of secondary batteries, sealing rings are generally used to insulate and seal the gap between the terminals and the top cover. However, during assembly, if the sealing ring is damaged, misaligned, or if fibers become trapped between the sealing ring and the top cover, it can easily lead to poor sealing of the secondary battery. Sealing tests for secondary batteries are typically conducted after the top cover assembly, casing, and cells are assembled. If poor airtightness is detected, the assembled secondary battery is scrapped, resulting in the scrapping of the lower insulation component, explosion-proof valve, top cover, and other components used in its assembly. This wastes resources and hinders cost control in secondary battery production. Summary of the Invention

[0004] This application discloses an electrode assembly, a top cover assembly, an energy storage device, and a power system. The electrode assembly allows for pre-testing of the sealing ring's airtightness during the secondary battery manufacturing process, effectively reducing losses to the top cover, lower insulation components, explosion-proof valves, and other materials, thus lowering production costs. Furthermore, it enables modular design of the electrode assembly, improving its versatility.

[0005] To achieve the above objectives, in a first aspect, this application discloses a pole assembly, comprising:

[0006] A connector 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 connector being used for fixed connection with a top cover;

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

[0008] The electrode post has a first end and a second end, the second end passing through the second through hole and the first through hole in sequence, and the first end extending radially along the electrode post to form a flange, the flange abutting against the side of the upper insulating member opposite to the connector.

[0009] A sealing ring is located axially between the flange and the connector along the pole post and radially between the outer peripheral wall of the pole post and the wall of the second through hole.

[0010] An insulating support member is disposed on the second surface. The insulating support member has a third through hole, which corresponds to the position of the first through hole along the axial direction of the pole post. The insulating support member is sleeved onto the outer peripheral wall of the pole post through the third through hole.

[0011] A pressure ring is connected to the second end and presses against the side of the insulating support member opposite to the second surface, so that the pressure ring can provide a compressive force to the sealing ring along the axial direction of the pole post, thereby enabling the sealing ring to be pressurized and sealed between the flange and the connector.

[0012] In this embodiment, the flange of the pole abuts against the side of the upper insulating member away from the connector, the second end of the pole passes through the second through hole and the first through hole in sequence, and the insulating support is disposed on the second surface. Furthermore, the pressure ring is fitted onto the outer peripheral wall of the electrode post, connected to the second end and pressing against the side of the insulating support member facing away from the second surface. This allows the pressure ring to provide axial extrusion force to the sealing ring along the electrode post, thereby enabling the sealing ring to be pressurized and sealed between the flange and the connector. This allows the connector, upper insulating member, electrode post, sealing ring, insulating support member, and pressure ring to form a whole, enabling modular design of the electrode post assembly, effectively improving its versatility and reducing production costs. It also allows the electrode post assembly to form a well-sealed whole, allowing for airtightness testing of the sealing ring. This enables the timely removal of poorly sealed electrode post assemblies from the secondary battery manufacturing process before assembling them with other components, effectively reducing the probability of poor sealing due to inadequate sealing rings in subsequent secondary battery processes. This effectively reduces the loss of other materials such as the top cover, lower insulating member, and explosion-proof valve, further reducing production costs.

[0013] In some embodiments, a groove is provided on the second surface of the connector, the groove extending radially through the connector along the pole post.

[0014] Therefore, when testing the airtightness of the pole assembly, the groove can guide the gas to the first through hole, effectively preventing the gas from not flowing along the connector due to excessive clamping force between the connector and the top cover, or between the connector and other components. This avoids the situation where the gas cannot flow along the connector to the seal, thus preventing the inability to effectively identify the poor sealing of the sealing ring.

[0015] In some embodiments, there are multiple grooves, which are spaced apart circumferentially on the second surface along the first through hole.

[0016] Therefore, when testing the airtightness of the pole assembly, the gas can flow through multiple grooves to the sealing ring, which further effectively prevents the gas from failing to effectively identify the poor sealing of the sealing ring due to excessive clamping force between the connector and the top cover, or between the connector and other components. This ensures that the sealing performance of each part of the sealing ring can be tested effectively.

[0017] In some embodiments, the insulating support has a third surface that abuts against the second surface, and a first protrusion is provided on the third surface along the radial direction of the pole post, the first protrusion being located between the pole post and the wall of the first through hole.

[0018] Therefore, the first protrusion can act as an insulator between the terminal and the connector. Compared with insulation by sealing ring, the first protrusion is less likely to become misaligned or come out of the first through hole during assembly, which can effectively prevent the performance of the secondary battery from being affected by short circuit between the terminal and the connector.

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

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

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

[0022] In some embodiments, the insulating support member further has a fourth surface that abuts 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. The first positioning portion and the second positioning portion cooperate to position the pressure ring and the insulating support member radially along the pole post.

[0023] Therefore, by cooperating with the first positioning part and the second positioning part, the pressure ring and the insulating support can be effectively prevented from moving relative to each other along the radial direction of the pole post, making the assembly between the pressure ring and the insulating support simple and quick, and improving the assembly efficiency of the pole post assembly.

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

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

[0026] Therefore, the structures of both the first positioning part and the second positioning part are relatively simple and easy 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 spaced apart along the circumference of the sealing ring, and the side ear structures abut against the wall of the second through hole.

[0028] Therefore, by setting multiple side lug structures on the outer peripheral wall of the sealing ring, the radial movement of the sealing ring along the pole can be effectively prevented during assembly, reducing the probability of the sealing ring being installed crookedly, and making the sealing stability of the sealing ring better.

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

[0030] Therefore, when the top cover is made of aluminum or aluminum alloy, the connection between the connector and the top cover can be aluminum-aluminum welded, which makes the airtightness less likely to be affected by welding pinholes, molten pool spatter, etc.

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

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

[0033] In some embodiments, the outer peripheral wall of the flange is provided with two parallel planes, which are used to provide a clamping surface and a clamping direction for the pole assembly.

[0034] Therefore, when assembling the terminal assembly with the top cover and lower insulation, or when assembling the top cover assembly with the secondary battery casing, the terminal assembly can be easily clamped, facilitating assembly.

[0035] Secondly, this application also discloses a top cover assembly, comprising:

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

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

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

[0039] Therefore, in this embodiment, the sealing ring of the terminal assembly in the top cover assembly can be tested for air tightness before being assembled with the top cover and the lower insulation component. This allows for the timely removal of terminal assemblies with poor air tightness before assembly, thereby effectively reducing the wear and tear on the top cover and the lower insulation component, and reducing the production cost of the secondary battery.

[0040] In other embodiments, the fifth surface is provided with any one of a plurality of fixing grooves and a plurality of fixing posts, and the lower insulating member is provided with another of the plurality of fixing grooves and a plurality of fixing posts on the side facing the fifth surface;

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

[0042] This makes the connection between the top cover and the lower insulation component more stable.

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

[0044] This allows the fixing post to be firmly fixed in the fixing groove, thereby making the connection between the top cover and the lower insulating component more secure and stable.

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

[0046] This allows multiple positions of the top cover to be fixedly connected to the lower insulating component, making the connection between the top cover and the lower insulating component more secure.

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

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

[0049] This effectively improves the torsional resistance of the pole.

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

[0051] This allows the connector to be positioned via the receiving groove during assembly with the top cover, facilitating the assembly of the connector and the top cover.

[0052] Thirdly, this application also discloses an energy storage device, comprising:

[0053] A housing having a receiving cavity and an opening communicating with the receiving cavity;

[0054] The battery cell, wherein the battery cell is housed within the receiving 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 cell.

[0056] The top cover assembly in the aforementioned energy storage device is the top cover assembly in the second aspect described above. Therefore, the top cover assembly in this embodiment has the technical effects of the top cover assembly in the second aspect described above.

[0057] Fourthly, this application also discloses an electrical system including 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. Therefore, the energy storage device in this embodiment has the technical effects of the energy storage device in the third aspect above.

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

[0060] In the application, the flange of the pole abuts against the side of the upper insulating member away from the connector, the second end of the pole passes through the second through hole and the first through hole in sequence, and the insulating support is disposed on the second surface. Furthermore, the pressure ring is fitted onto the outer peripheral wall of the electrode post, connected to the second end and pressing against the side of the insulating support member facing away from the second surface. This allows the pressure ring to provide axial extrusion force to the sealing ring along the electrode post, thereby enabling the sealing ring to be pressurized and sealed between the flange and the connector. This allows the connector, upper insulating member, electrode post, sealing ring, insulating support member, and pressure ring to form a whole, enabling modular design of the electrode post assembly, effectively improving its versatility and reducing production costs. It also allows the electrode post assembly to form a well-sealed whole, allowing for airtightness testing of the sealing ring. This enables the timely removal of poorly sealed electrode post assemblies from the secondary battery manufacturing process before assembling them with other components, effectively reducing the probability of poor sealing due to inadequate sealing rings in subsequent secondary battery processes. This effectively reduces the loss of other materials such as the top cover, lower insulating member, and explosion-proof valve, further reducing production costs. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0062] Figure 1 This is an exploded view of a pole post assembly provided in an embodiment of this application;

[0063] Figure 2 This is a perspective view of a pole post assembly provided in an embodiment of this application;

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

[0065] Figure 4 yes Figure 3 Enlarged view of position A in the middle;

[0066] Figure 5 This is a perspective view of a connector provided in an embodiment of this application;

[0067] Figure 6 This is a perspective view of an insulating support member provided in an embodiment of this application;

[0068] Figure 7 This is a perspective view of an insulating support member after being rotated at a certain angle, according to an embodiment of this application.

[0069] Figure 8 This is a perspective view of a pressure ring provided in an embodiment of this application;

[0070] Figure 9 This is a perspective view of a sealing ring provided in an embodiment of this application;

[0071] Figure 10 This is a schematic diagram of the structure of a sealing ring and an upper insulating component assembled according to an embodiment of this application;

[0072] Figure 11 This is a perspective view of a connector after it has been flipped at a certain angle, according to an embodiment of this application.

[0073] Figure 12 This is a perspective view of a pole provided in an embodiment of this application;

[0074] Figure 13 This is an exploded view of a top cover assembly provided in an embodiment of this application;

[0075] Figure 14 This is a cross-sectional view of a top cover assembly provided in an embodiment of this application;

[0076] Figure 15 This is a partially enlarged view of a lower insulating member provided in an embodiment of this application;

[0077] Figure 16 This is an exploded view of an energy storage device provided in an embodiment of this application;

[0078] Figure 17 This is a schematic diagram of an electrical system provided in an embodiment of this application.

[0079] Explanation of reference numerals in the attached figures:

[0080] 1-Connector; 11-First surface; 12-Second surface; 13-First through hole; 14-Groove; 15-Second protrusion; 2-Upper insulating component; 21-Second through hole; 3-Pole post; 31-First end; 32-Second end; 33-Flange; 34-Flat surface; 4-Sealing ring; 41-Side ear structure; 5-Pressure ring; 51-Second positioning part; 6-Insulating support component; 61-Third through hole; 62-Third surface; 63-First protrusion; 64-Fourth surface; 65-First positioning part;

[0081] 10-Pole post assembly; 20-Top cover; 201-Fifth surface; 202-Sixth surface; 203-Fourth through hole; 204-Fixing groove; 205-Receiving groove; 30-Lower insulation component; 301-Fifth through hole; 302-Fixing post;

[0082] 1000 - Electrical system; 100 - Energy storage device; 110 - Top cover assembly; 120 - Battery cell; 130 - Housing; 200 - Power conversion device; 300 - Electrical load. Detailed Implementation

[0083] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0084] In this application, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0085] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0086] A rechargeable battery, also known as a secondary battery or storage battery, is a battery that can be recharged after being discharged to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, higher requirements are being placed on their energy density, reliability, and cost.

[0087] Based on the problems in the background technology mentioned above, this application discloses a terminal assembly, a top cover assembly, an energy storage device, and a power system. The terminal assembly can detect the sealing performance of the sealing ring in advance during the manufacturing process of the secondary battery, effectively preventing 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, lower insulation component, and explosion-proof valve, effectively reducing production costs, and also enabling the terminal assembly to be modularly designed, improving its versatility.

[0088] The technical solution of this application will be further described below with reference to specific embodiments and accompanying 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 post 3, a sealing ring 4, an insulating support member 6, and a pressure ring 5. 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. The connector 1 is used for fixed connection with the top cover 20. The upper insulating member 2 is disposed on the first surface 11 and has a second through hole 21, which corresponds to the position of the first through hole 13. The pole post 3 has a first end 31 and a second end 32. The second end 32 passes through the second through hole 21 and the first through hole 13 in sequence. The first end 31 extends radially along the pole post 3 (e.g., ...). Figure 1 A flange 33 extends along the direction indicated by the X arrow in the middle, and the flange 33 abuts against the side of the upper insulating member 2 facing away from the connecting member 1; the sealing ring 4 extends along the axial direction of the pole post 3 (as shown by the X arrow in the middle). Figure 1 The direction indicated by the Y-arrow is located between the flange 33 and the connector 1, and is located radially between the outer peripheral wall of the pole post 3 and the hole wall of the second through hole 21; the insulating support 6 is disposed on the second surface 12, and the insulating support 6 has a third through hole 61, which corresponds to the position of the first through hole 13 along the axial direction of the pole post 3, and the insulating support 6 is sleeved on the outer peripheral wall of the pole post 3 through the third through hole 61; and the pressure ring 5 is connected to the second end 32 and presses against the side of the insulating support 6 away from the second surface 12, so that the pressure ring 5 can provide a compressive force to the sealing ring 4 along the axial direction of the pole post 3, thereby allowing the sealing ring 4 to be pressurized and sealed between the flange 33 and the connector 1.

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

[0091] In the above description, the sealing ring 4 is located axially between the flange 33 and the connector 1 along the pole post 3, and radially between the outer peripheral wall of the pole post 3 and the wall of the second through hole 21. This allows the sealing ring 4 to seal between the flange 33 and the connector 1, and between the pole post 3 and the upper insulating member 2. The pressure ring 5 is connected to the second end 32 and presses against the side of the insulating support 6 opposite to the second surface 12, so that the pressure ring 5 can provide a compressive force to the sealing ring 4 along the axial direction of the pole post 3. This allows the sealing ring 4 to deform along the axial direction and radial direction of the pole post 3, thereby enabling the sealing ring 4 to be pressurized and sealed between the flange 33 and the connector 1. This improves the sealing performance of the sealing ring 4 and effectively increases the yield of the pole post assembly 10.

[0092] The upper insulating component 2 can be made of at least one of the following materials: ethylene-tetrafluoroethylene copolymer, polyethylene terephthalate, polyphenylene sulfide, or ceramics, and is not limited to any one of them.

[0093] It should be explained that the aforementioned insulating support 6 refers to an insulating component made of a relatively hard material that is not easily compressed and deformed, so as to provide support between the second surface 12 and the pressure ring 5.

[0094] Therefore, the insulating support 6 is disposed on the second surface 12, and the pressure ring 5 abuts against the side of the insulating support 6 facing away from the second surface 12. That is, the insulating support 6 is located between the connector 1 and the pressure ring 5, which can play an insulating role between the connector 1 and the pressure ring 5, avoiding the impact on the performance of the secondary battery due to short circuit between the connector 1 and the pressure ring 5. Moreover, compared with insulation by using a softer insulating pad, the impact on the compression of the sealing ring 4 can be effectively reduced, thereby improving the sealing effect of the sealing ring 4.

[0095] The insulating support 6 can 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., and is not limited here.

[0096] Optionally, such as Figure 4 and Figure 5 As shown, a groove 14 is provided on the second surface 12 of the connector 1, and the groove 14 penetrates the connector 1 radially along the pole post 3.

[0097] It should be explained that the groove 14 mentioned above penetrates the connector 1 radially along the pole post 3, meaning that the groove 14 penetrates the outer peripheral wall of the connector 1 and the hole wall of the first through hole 13.

[0098] Therefore, when performing airtightness testing on the terminal assembly 10, the gas can be guided to the first through hole 13 through the groove 14, allowing the gas to quickly reach the sealing ring 4 along the gap between the hole wall of the first through hole 13 and the terminal 3. This effectively prevents the gas from not flowing along the connector 1 due to excessive clamping force between the connector 1 and the top cover 20, or between the connector 1 and other components. It also avoids the situation where the sealing ring 4 cannot be effectively identified due to the gas not flowing along the connector 1, thus improving the detection effect and efficiency of the sealing ring 4. This further reduces the probability of poor sealing due to the sealing ring 4 in subsequent processes of the secondary battery, and further reduces the loss of the top cover 20, the lower insulating component 30, the explosion-proof valve, and other materials.

[0099] The cross-sectional shape of the groove 14 can be any one of rectangle, trapezoid, semicircle, triangle, etc., and is not limited here.

[0100] In addition, there are multiple grooves 14, which are spaced apart on the second surface 12 around the first through hole 13.

[0101] Therefore, when performing airtightness testing on the pole assembly 10, gas can flow through multiple grooves 14 to the sealing ring 4, which further effectively prevents the gas from failing to effectively identify the sealing ring 4 due to excessive clamping force between the connector 1 and the top cover 20, or between the connector 1 and other components, thus ensuring that the sealing performance of each part of the sealing ring 4 can have a good testing effect.

[0102] The number of grooves 14 can be two, three or more, and is not limited here.

[0103] In addition, multiple grooves 14 are 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 improving the sealing performance of the sealing ring 4.

[0104] Optionally, such as Figure 4 and Figure 6 As shown, the insulating support 6 has a third surface 62 that abuts against the second surface 12. A first protrusion 63 is provided on the third surface 62. Along the radial direction of the pole post 3, the first protrusion 63 is located between the pole post 3 and the hole wall of the first through hole 13.

[0105] Therefore, the first protrusion 63 can serve as an insulator between the terminal post 3 and the connector 1. Compared with insulation through the sealing ring 4, the first protrusion 63 is less likely to become misaligned or come out of the first through hole 13 during assembly, which can effectively prevent the performance of the secondary battery from being affected by short circuits between the terminal post 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 post 3, or the first protrusion 63 may be flush with the first surface 11, or the first protrusion 63 may extend out of the first through hole 13. No limitation is made here.

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

[0108] Therefore, by cooperating with the first positioning part 65 and the second positioning part 51, the pressure ring 5 and the insulating support 6 can be effectively prevented from moving relative to each other in the radial direction of the pole post 3, making the assembly between the pressure ring 5 and the insulating support 6 simple and quick, and improving the assembly efficiency of the pole post assembly 10.

[0109] The first positioning part 65 includes a first annular positioning protrusion, and the second positioning part 51 includes a first annular positioning groove, with the first annular positioning protrusion embedded in the first annular positioning groove; or, the first positioning part 65 includes a second annular positioning groove, and the second positioning part 51 includes a second annular positioning protrusion, with the second annular positioning protrusion embedded in the second annular positioning groove; or, the first positioning part 65 includes a first annular positioning protrusion and a second annular positioning groove, and the second positioning part 51 includes a first annular positioning groove and a second annular positioning protrusion, with the first annular positioning protrusion embedded in the first annular positioning groove and the second annular positioning protrusion embedded in the second annular positioning groove.

[0110] Therefore, the structures of both the first positioning part 65 and the second positioning part 51 are relatively simple and easy to implement.

[0111] The annular positioning protrusion can be any of the following types: circular annular positioning protrusion, pentagonal annular positioning protrusion, hexagonal annular positioning protrusion, etc., and is not limited here. Similarly, the annular positioning groove can be any of the following types: circular annular positioning groove, pentagonal annular positioning groove, hexagonal annular positioning groove, etc., and is not limited here.

[0112] Optionally, along the axial direction of the pole post 3, the outer peripheral wall of the pole post 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 against 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 against the third planar structure.

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

[0114] The first planar structure can be any of the following: a quadrilateral planar structure, a hexagonal planar structure, a pentagonal planar structure, etc., without any limitation. The second planar structure can be a planar structure adapted to the first planar structure.

[0115] The structures of the third and fourth plane structures are roughly the same as those of the first plane structure. For details, please refer to the above description, which will not be repeated here.

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

[0117] In other embodiments, such as Figure 9 and Figure 10 As shown, a plurality of side ear structures 41 are provided 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, and the side ear structures 41 abut against the wall of the second through hole 21.

[0118] Therefore, by providing multiple 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 post 3 during the assembly process, reducing the probability of the sealing ring 4 being installed crookedly; on the other hand, it can make the sealing ring 4 have a gap between the radial side of the pole post 3 and the hole wall of the second through hole 21, providing the sealing ring 4 with a deformation space in the radial side of the pole post 3.

[0119] The shape of the side ear structure 41 can be any of the following: semi-circular structure, trapezoidal structure, rectangular structure, etc., and is not limited here.

[0120] In addition, multiple 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 makes the sealing ring 4 less likely to move radially along the pole post 3, further reducing the probability of the sealing ring 4 being installed crookedly.

[0121] The aforementioned connector 1 is an aluminum connector.

[0122] Therefore, when the top cover 20 is made of aluminum or aluminum alloy, the connection between the connector 1 and the top cover 20 can be aluminum-aluminum welded. Aluminum has a low melting point, which allows the weld between the connector 1 and the top cover 20 to have high quality and is less likely to affect the airtightness due to welding pinholes, molten pool spatter, etc.

[0123] In some embodiments, such as Figure 4 and Figure 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 post 3.

[0124] Therefore, the second protrusion 15 can serve a positioning function, facilitating the assembly of the connector 1 and improving the assembly efficiency of the terminal assembly 10. Furthermore, when injecting electrolyte into the secondary battery equipped with the terminal assembly 10, it can effectively prevent electrolyte from flowing to the terminal 3, thus effectively improving battery performance.

[0125] The second protrusion 15 can be an annular protrusion or it can include multiple protrusions, which are spaced apart around the first through hole 13. This is not limited here.

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

[0127] Therefore, when assembling the terminal assembly 10 with the top cover 20 and the lower insulating member 30, or when assembling the top cover assembly 110 with the secondary battery casing 130, the terminal assembly 10 can be easily clamped, which facilitates assembly.

[0128] A groove can be provided on the side of the upper insulating member 2 facing the first end 31. The second through hole 21 can be provided on the bottom wall of the groove. The bottom wall of the groove abuts against the side of the flange 33 facing the second end 32. The side wall of the groove abuts against part of the outer peripheral wall of the flange 33, so as to play a certain positioning role for the installation of the upper insulating member 2 and facilitate the installation between the upper insulating member 2 and the pole post 3.

[0129] This application embodiment also provides a top cover assembly 110, such as Figure 13 and Figure 14 As shown, the assembly includes a top cover 20, a lower insulating member 30, and any of the pole assembly 10 described in the above embodiments. The top cover 20 has a fifth surface 201 and a sixth surface 202 facing away from 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 has a fifth through hole 301, the fifth through hole 301 and the fourth through hole 203 being positioned opposite each other; and the pole assembly 10 is sequentially inserted 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 inserted into the fifth through hole 301.

[0130] Therefore, before the terminal assembly 10 in the top cover assembly 110 is assembled with the top cover 20 and the lower insulating component 30, the sealing ring 4 can be tested for air tightness. This allows for the timely removal of terminal assemblies 10 with poor air tightness before assembly, thereby effectively reducing the wear and tear on the top cover 20 and the lower insulating component 30, 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 of the above embodiments. Therefore, the pole assembly 10 in this embodiment has the technical effects of the pole assembly 10 in the above embodiments. Since the technical effects of the pole assembly 10 have been fully explained in the above embodiments, they will not be repeated here.

[0132] The pressure ring 5 is inserted into the fifth through hole 301. 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. No limitation is made here.

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

[0134] This makes the connection between the top cover 20 and the lower insulating component 30 more stable, so that the top cover 20 and the lower insulating component 30 are less likely to shake during the subsequent assembly of the top cover assembly 110 with the housing 130 and the battery cell 120, which helps to improve the assembly quality and improve the performance of the secondary battery.

[0135] The fixing post 302 can be filled into the fixing groove 204 by ultrasonic heat melting, which makes the connection between the fixing post 302 and the fixing groove 204 easy to achieve; or the fixing post 302 can be an elastic post, which is squeezed into the fixing groove 204. There is no limitation here, as long as the fixing post 302 can be filled into the fixing groove 204.

[0136] The number of fixing slots 204 can be two, three, or more, and is not limited here. Similarly, the number of fixing columns 302 can be two, three, or more, and is not limited here.

[0137] The aforementioned fixing groove 204 can be implemented in various ways. In one possible implementation, the fixing groove 204 can be a cylindrical groove, which has a simple structure and is easy to implement.

[0138] In another implementation of the fixing slot 204, such as Figure 15 As shown, the fixing groove 204 is an inverted groove. This allows the fixing post 302 to be firmly fixed in the fixing groove 204, thereby making the connection between the top cover 20 and the lower insulating member 30 more secure and stable.

[0139] Optionally, multiple fixing slots 204 are spaced apart along the length of the top cover 20 and symmetrically arranged along the width of the top cover 20; or, multiple fixing posts 302 are spaced apart along the length of the top cover 20 and symmetrically arranged along the width of the top cover 20. This allows multiple positions of the top cover 20 to be fixedly connected to the lower insulating member 30, making the connection between the top cover 20 and the lower insulating member 30 more robust.

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

[0141] As a result, the torque received by the pole post 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, effectively improving the torsional resistance of the pole post 3.

[0142] The fifth planar structure can be any of the following: a quadrilateral planar structure, a hexagonal planar structure, a pentagonal planar structure, etc., without any limitation. The sixth planar structure can be a planar structure adapted to the fifth plane.

[0143] The structures of the seventh and eighth plane structures are roughly the same as those of the fifth plane structure. Please refer to the above for details, which will not be repeated here.

[0144] In other embodiments, such as Figure 13 As shown, a receiving groove 205 is provided on the fifth surface 201, the connector 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 connector 1 is assembled with the top cover 20, it can be positioned by the receiving groove 205, which facilitates the assembly of the connector 1 and the top cover 20.

[0146] The connector 1 is fixed in the receiving groove 205. It can be that the connector 1 is welded into the receiving groove 205 or that the connector 1 is glued into the receiving groove 205. There is no limitation on this.

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

[0148] This application also provides an energy storage device, such as... Figure 16 As shown, the device includes a housing 130, a battery cell 120, and a top cover assembly 110 as described in any of the above embodiments. The housing 130 has a receiving cavity and an opening communicating with the receiving cavity; the battery cell 120 is housed within the receiving cavity; and the top cover assembly 110 is sealed at the opening, and the pressure ring 5 is electrically connected to the battery cell 120.

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

[0150] The energy storage device 100 may include any one of the following: secondary battery, battery pack, battery module, battery cluster, etc., without limitation.

[0151] This application also provides an electrical system, such as... Figure 17 As shown, the energy storage device 100 includes 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 embodiments. Therefore, the energy storage device 100 in this embodiment has the technical effects of the energy storage device 100 in the above embodiments. Since the technical effects of the energy storage device 100 have been fully explained in the above embodiments, they will not be repeated here.

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

[0154] In addition, the power 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 electrical energy. The power conversion device 200 can be a solar panel, windmill, 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above 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 connector 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 connector being used for fixed connection with a top cover; An upper insulating member is disposed on the first surface, and the upper insulating member has a second through hole, the second through hole being positioned corresponding to the first through hole; The electrode post has a first end and a second end, the second end passing through the second through hole and the first through hole in sequence, and the first end extending radially along the electrode post to form a flange, the flange abutting against the side of the upper insulating member opposite to the connector. A sealing ring is located axially between the flange and the connector along the pole post and radially between the outer peripheral wall of the pole post and the wall of the second through hole. An insulating support member is disposed on the second surface. The insulating support member has a third through hole, which corresponds to the position of the first through hole along the axial direction of the pole post. The insulating support member is sleeved onto the outer peripheral wall of the pole post through the third through hole. A pressure ring is connected to the second end and presses against the side of the insulating support member opposite to the second surface, so that the pressure ring can provide a compressive force to the sealing ring along the axial direction of the pole post, thereby enabling the sealing ring to be pressurized and sealed 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 connector, and the groove penetrates the connector radially along the pole post.

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

4. The pole assembly according to claim 1, characterized in that, The insulating support has a third surface that abuts against the second surface, and a first protrusion is provided on the third surface along the radial direction of the pole post. The first protrusion is located between the pole post and the wall of the first through hole.

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

6. The pole assembly according to claim 1, characterized in that, The insulating support member also has a fourth surface that abuts against the pressure ring. A first positioning part is provided on the fourth surface, and a second positioning part is provided on the side of the pressure ring facing the fourth surface. The first positioning part and the second positioning part cooperate to position the pressure ring and the insulating support member radially along the pole post.

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

8. The pole assembly according to any one of claims 1-7, characterized in that, The outer peripheral wall of the sealing ring is provided with a plurality of side ear structures, which are spaced apart along the circumference of the sealing ring, and the side ear structures abut against the wall of the second through hole.

9. The pole assembly according to any one of claims 1-7, characterized in that, A second protrusion is provided 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 post.

10. The pole assembly according to any one of claims 1-7, characterized in that, The outer peripheral wall of the flange has two parallel planes, which are used to provide a clamping surface and clamping direction for the pole assembly.

11. A top cover assembly, characterized in that, include: A top cover having a fifth surface and a sixth surface facing away from each other, and a fourth through hole penetrating the fifth surface and the sixth surface; A lower insulating member abutting against the sixth surface, the lower insulating member having a fifth through hole corresponding to the fourth through hole; and... The pole assembly according to any one of claims 1-10, wherein the pole assembly is sequentially disposed through the fourth through hole and the fifth through hole, the connector is fixedly connected to the fifth surface, and the pressure ring is disposed within the fifth through hole.

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

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

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

15. The top cover assembly according to claim 11, characterized in that, A receiving groove is provided on the fifth surface, the connector 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 having a receiving cavity and an opening communicating with the receiving cavity; The battery cell is housed within the receiving cavity; as well as, The top cover assembly according to any one of claims 11-15, wherein the top cover assembly is sealed at the opening, and the pressure ring is electrically connected to the battery cell.

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

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