A top cover assembly, an energy storage device and an electric system

Abstract

The application discloses a top cover assembly, an energy storage device and an electric system. The top cover assembly comprises a top cover, a lower insulating part, a pole, a sealing part, a compression ring and a heat insulation part. The top cover has a first through hole. The lower insulating part comprises a first surface, a second surface and a second through hole. The first surface is in abutment with the top cover. The second through hole corresponds to the first through hole in position. The second end of the pole passes through the first through hole and the second through hole in sequence. The first end of the pole extends along the radial direction of the pole to form a flange. The sealing part is sleeved on the outer circumferential surface of the pole and is located between the top cover and the flange along the axial direction of the pole. The compression ring is welded to the second end. The heat insulation part comprises a body, at least one first supporting part and a third through hole. The body is sleeved on the outer circumferential surface of the pole through the third through hole and is arranged between the second surface and the compression ring along the axial direction of the pole. The first supporting part is arranged on the side of the body facing the second surface and is in abutment with the second surface, so that a gap is formed between the body and the second surface along the axial direction of the pole.

Description

Technical Field

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

[0002] A rechargeable battery, also known as a rechargeable battery or a storage battery, involves laser welding of the terminals and pressure ring in the top cover assembly during its manufacturing process. The pressure ring is typically made of metal, and the terminals and pressure ring are usually welded together.

[0003] However, the melting points of the terminals and pressure rings are usually high, and a lot of heat is generated during the welding process. In addition, the terminals and pressure rings have good thermal conductivity, which easily transfers a lot of heat to the lower insulation component. This can cause the lower insulation component to melt due to heat, resulting in inadequate compression of the seal and failure of the seal, thus posing a safety hazard to the secondary battery. Summary of the Invention

[0004] This application discloses a top cover assembly, an energy storage device, and a power supply system. The top cover assembly effectively reduces the probability of the lower insulation component melting due to heat during welding of the pressure ring and the terminal post, thus improving the safety performance of the secondary battery.

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

[0006] Top cover, the top cover having a first through hole;

[0007] The lower insulating member includes a first surface and a second surface facing away from each other, and a second through hole penetrating the first surface and the second surface. The first surface abuts against the top cover, and the second through hole corresponds to the position of the first through hole.

[0008] The pole post has a first end and a second end, the second end passing through the first through hole and the second through hole in sequence, and the first end extending radially along the pole post to form a flange;

[0009] A sealing element is sleeved on the outer peripheral surface of the pole post and is located along the axial direction of the pole post between the side of the top cover facing away from the first surface and the flange.

[0010] A pressure ring, said pressure ring being welded to the second end; and,

[0011] A heat insulation component, comprising a body, at least one first support portion and a third through hole, wherein the body is sleeved on the outer peripheral surface of the pole post through the third through hole and is disposed between the second surface and the pressure ring along the axial direction of the pole post; the first support portion is disposed on the side of the body facing the second surface and abuts against the second surface, thereby forming a gap between the body and the second surface along the axial direction of the pole post.

[0012] In this embodiment, by setting the body of the heat insulation component along the axial direction of the electrode post between the second surface and the pressure ring, the heat transferred from the pressure ring to the lower insulation component is effectively reduced, and the probability of the lower insulation component melting due to heat during welding of the pressure ring is reduced. This reduces the probability of the seal not being compressed properly due to the lower insulation component melting due to heat, resulting in better safety performance of the secondary battery.

[0013] The first support is disposed on the side of the body facing the second surface, and the first support abuts against the second surface, so that a gap is formed between the body and the second surface along the axial direction of the electrode post. This allows an air insulation layer to be formed between the body and the second surface of the lower insulator, further reducing the heat transferred from the pressure ring to the lower insulator, further reducing the probability of the lower insulator melting due to heat, and making the safety performance of the secondary battery better.

[0014] In some implementations, the first support portion includes a support ring, which is circumferentially disposed on one side of the body facing the second surface along the third through hole.

[0015] Therefore, the structure of the first support part can be relatively simple and easy to implement.

[0016] In some implementations, the support ring includes a first sub-support ring and a second sub-support ring coaxially arranged, the first sub-support ring and the second sub-support ring being radially spaced along the pole post on one side of the body facing the second surface.

[0017] Therefore, when the body of the heat insulation component is compressed, each part of the body can be supported by the first support part, and it is not easy for it to tilt, so that each part of the body and the lower insulation component can form an air insulation layer.

[0018] In some implementations, the first sub-support ring is positioned close to the third through hole, and the second sub-support ring is positioned close to the outer peripheral edge of the body.

[0019] Therefore, the edge of the body near the third through hole and the outer peripheral edge are not easily deformed when subjected to pressure. This ensures that the heat insulation effect of the air insulation layer formed by the edge of the body and the lower insulating component, as well as the heat insulation effect of the air insulation layer formed by the lower insulating component and other parts of the body, are basically the same, further reducing the probability of the lower insulating component melting due to heat caused by the welding of the pressure ring.

[0020] In some implementations, the first support portion includes a plurality of first support protrusions, which are circumferentially spaced on one side of the body facing the second surface.

[0021] This design allows for gaps between larger areas of the battery body and the lower insulating component, further reducing the likelihood of the lower insulating component melting due to heat and improving the safety performance of the secondary battery.

[0022] In some implementations, the edge of the second through hole extends toward the top cover with a protrusion located between the outer peripheral surface of the pole post and the wall of the first through hole along the radial direction of the pole post.

[0023] Therefore, the protrusion can insulate the terminal post from the top cover. Compared with placing the seal between the outer circumferential surface of the terminal post and the wall of the first through hole, the protrusion is less likely to be misaligned during the assembly of the top cover assembly, resulting in better insulation reliability between the terminal post and the top cover and improving the safety performance of the secondary battery.

[0024] In some implementations, along the axial direction of the pole, the seal is at least partially opposite the protrusion and has a first gap from the protrusion.

[0025] This effectively prevents the lower insulating component from pressing the heat insulation component with a large force due to the pressure of the seal on the protrusion, thus avoiding excessive heat transfer to the lower insulating component. This effectively reduces the risk of the lower insulating component melting due to heat and further improves the safety performance of the secondary battery.

[0026] In some implementations, along the axial direction of the pole post, the protrusion is lower than the surface of the top cover abutting against the seal, so that the first gap is formed between the protrusion and the seal, and / or,

[0027] Along the axial direction of the pole, the seal is provided with a first groove at a position corresponding to the protrusion, so that the first gap is formed between the protrusion and the bottom wall of the first groove.

[0028] Therefore, the implementation of the first interval is simple and easy to implement.

[0029] In some implementations, a first heat insulation layer is coated on the side of the flange that abuts against the seal, and the projection of the seal onto the flange along the axial direction of the pole is located on the first heat insulation layer.

[0030] Therefore, the heat transferred from the electrode to the seal can be reduced by the first heat insulation layer, which effectively reduces the possibility of heat damage to the seal and improves the airtightness of the top cover assembly. This allows the secondary battery with the top cover assembly to still have good sealing performance, thereby giving the secondary battery better safety performance.

[0031] In some implementations, the thickness of the first insulation layer is 50µm to 200µm.

[0032] Therefore, the thickness of the first insulation layer is between 50um and 200um, which can give the sealant both good sealing performance and good heat insulation effect.

[0033] In some implementations, the lower insulating member is provided with at least one clearance hole;

[0034] At least one second support portion is provided on the side of the main body facing the lower insulating member. The second support portion passes through the clearance hole and abuts against the second surface of the top cover.

[0035] Therefore, the distance between the pressure ring and the top cover can be further separated by the heat insulation component. Even if the lower insulation component melts and thins due to heat, the heat insulation component can still prevent the pressure ring from being pressed too far towards the top cover. This ensures that the step height difference between the pressure ring and the electrode post meets the requirements, preventing the connecting piece from arching and deforming during subsequent welding, and effectively improving the performance of the secondary battery.

[0036] In some implementations, the second support portion includes a plurality of second support protrusions, which are circumferentially spaced on one side of the body facing the second surface.

[0037] Therefore, the structure of the second support part can be made simpler and easier to implement.

[0038] In some implementations, a groove is provided on the second surface, the pressure ring is at least partially housed in the groove, the heat insulation member is located between the bottom wall of the groove and the pressure ring, the outer peripheral surface of the pressure ring corresponds to the side wall of the groove along the radial direction of the pole post, the outer peripheral edge of the pressure ring is provided with a first chamfer, and the side wall of the groove is provided with a second groove so that at least a portion of the side wall of the groove forms a second gap with the outer peripheral surface of the pressure ring.

[0039] Therefore, by providing a first chamfer on the outer peripheral edge of the pressure ring and a second groove on the side wall of the sink, a second gap is formed between at least a portion of the side wall of the sink and the outer peripheral surface of the pressure ring. This effectively reduces the contact area between the pressure ring and the side wall of the sink, thereby effectively reducing the heat transferred from the outer peripheral surface of the pressure ring to the lower insulating component, further reducing the probability of the lower insulating component melting due to heat, and thus improving the safety performance of the secondary battery.

[0040] In some implementations, a second heat insulation layer is coated on the sidewall of the groove.

[0041] This reduces the amount of heat transferred from the outer circumference of the pressure ring to the lower insulation component, thus lowering the chance of the lower insulation component melting due to heat and improving the safety performance of the secondary battery.

[0042] In some implementations, the outer peripheral surface of the pole located between the flange and the pressure ring has a first planar structure, the wall of the second through hole has a second planar structure, and the wall of the third through hole has a third planar structure, wherein the first planar structure abuts against the second planar structure and the third planar structure respectively;

[0043] The outer peripheral surface of the body has a fourth planar structure, and the sidewall of the settling tank has a fifth planar structure, with the fourth planar structure abutting against the fifth planar structure.

[0044] This allows the torque on the terminal post to be transmitted to the top cover and the lower insulation component, as well as to the lower insulation component through the heat insulation component, effectively improving the terminal post's torsional resistance and thus improving the performance of the secondary battery.

[0045] In some implementations, the first support portion protrudes from the body along the axial direction of the pole post by a height of A, where A ≥ 0.05 mm.

[0046] This allows for a larger gap between the body and the second surface along the axial direction of the electrode post, and enables the formation of a larger air insulation layer along the axial direction of the electrode post between the body and the second surface of the lower insulator. This further reduces the heat transferred from the pressure ring to the lower insulator, further reducing the probability of the lower insulator melting due to heat, and thus improving the safety performance of the secondary battery.

[0047] Secondly, this application also discloses an energy storage device, comprising:

[0048] A housing having a receiving cavity and an opening communicating with the receiving cavity;

[0049] The battery cell, wherein the battery cell is housed within the receiving cavity; and,

[0050] The top cover assembly as described in any one of the first aspects, the top cover assembly is sealed at the opening, and the pressure ring is electrically connected to the battery cell.

[0051] Thirdly, this application also discloses an electrical system including the energy storage device described in the second aspect.

[0052] In this embodiment, the energy storage device of the power system is the energy storage device described in the second aspect above. Therefore, the energy storage device in this embodiment has the technical effects of the energy storage device in the second aspect above.

[0053] Compared with the prior art, the beneficial effects of this application are as follows:

[0054] In the application, by setting the body of the heat insulation component between the second surface and the pressure ring, the heat transferred from the pressure ring to the lower insulation component is effectively reduced, and the probability of the lower insulation component melting due to heat during welding of the pressure ring is reduced. This reduces the probability of the seal not being compressed properly due to the lower insulation component melting due to heat, resulting in better safety performance of the secondary battery.

[0055] The first support is disposed on the side of the body facing the second surface, and the first support abuts against the second surface, so that a gap is formed between the body and the second surface along the axial direction of the electrode post. This allows an air insulation layer to be formed between the body and the second surface of the lower insulator, further reducing the heat transferred from the pressure ring to the lower insulator, further reducing the probability of the lower insulator melting due to heat, and making the safety performance of the secondary battery better. Attached Figure Description

[0056] 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.

[0057] Figure 1 This is an exploded view of a top cover assembly provided in an embodiment of this application;

[0058] Figure 2 This is a perspective view of a top cover assembly provided in an embodiment of this application;

[0059] Figure 3 This is a cross-sectional view of a top cover assembly provided in an embodiment of this application;

[0060] Figure 4 yes Figure 3 Enlarged view of position C in the middle;

[0061] Figure 5 yes Figure 4The first enlarged view at position D in the middle;

[0062] Figure 6a This is a perspective view of a heat insulation component provided in an embodiment of this application;

[0063] Figure 6b This is a perspective view of another heat insulation component provided in the embodiments of this application;

[0064] Figure 7 yes Figure 1 Enlarged view of position B in the middle;

[0065] Figure 8 yes Figure 4 The second enlarged view at position D;

[0066] Figure 9 yes Figure 4 The third enlarged view at position D;

[0067] Figure 10 This is an exploded view of an energy storage device provided in an embodiment of this application;

[0068] Figure 11 This is a schematic diagram of the structure of an electrical system provided in an embodiment of this application.

[0069] Explanation of reference numerals in the attached figures:

[0070] 1-Top cover; 11-First through hole; 2-Lower insulating component; 21-First surface; 22-Second surface; 23-Second through hole; 24-Protrusion; 25-Allowing hole; 26-Counter groove; 261-Second groove; 3-Pole post; 31-First end; 32-Second end; 33-Flange; 4-Sealing component; 41-First groove; 5-Pressure ring; 51-First chamfer; 6-Heat insulation component; 61-Body; 62-First support part; 621-First sub-support ring; 622-Second sub-support ring; 623-First support protrusion; 63-Third through hole; 64-Second support part; 8-First heat insulation layer; 9-Upper insulating component;

[0071] 10 - Top cover assembly; 20 - Battery cell; 30 - Housing;

[0072] 1000 - Electrical system; 100 - Energy storage device; 200 - Power conversion device; 300 - Electrical load. Detailed Implementation

[0073] 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.

[0074] 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.

[0075] 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.

[0076] To address the problems in the background art, this application discloses a top cover assembly, an energy storage device, and a power supply system. This top cover assembly effectively reduces the probability of the lower insulation component melting due to heat during welding of the pressure ring and the electrode post, thus improving the safety performance of the secondary battery.

[0077] The technical solution of this application will be further described below with reference to specific embodiments and accompanying drawings.

[0078] This embodiment provides a top cover assembly, such as... Figures 1-6b As shown, it includes a top cover 1, a lower insulating component 2, a pole post 3, a sealing component 4, a pressure ring 5, and a heat insulation component 6. The top cover 1 has a first through hole 11; the lower insulating component 2 includes a first surface 21 and a second surface 22 facing away from each other, and a second through hole 23 penetrating the first surface 21 and the second surface 22. The first surface 21 abuts against the top cover 1, and the second through hole 23 corresponds to the position of the first through hole 11; the pole post 3 has a first end 31 and a second end 32, the second end 32 passing through the first through hole 11 and the second through hole 23 in sequence, and the first end 31 extending radially along the pole post 3 (e.g., ...). Figure 1 A flange 33 extends in the direction indicated by X; a sealing element 4 is fitted onto the outer circumferential surface of the pole post 3 and extends along the axial direction of the pole post 3 (e.g., as shown by X). Figure 1The direction shown in the middle Y) is located between the side of the top cover 1 facing away from the first surface 21 and the flange 33; the pressure ring 5 is welded to the second end 32; the heat insulation member 6 includes a body 61, at least one first support part 62 and a third through hole 63. The body 61 is sleeved on the outer peripheral surface of the pole post 3 through the third through hole 63 and is arranged between the second surface 22 and the pressure ring 5 along the axial direction of the pole post 3. The first support part 62 is arranged on the side of the body 61 facing the second surface 22 and abuts against the second surface 22 so that a gap is formed between the body 61 and the second surface 22 along the axial direction of the pole post 3.

[0079] It is understandable that both the pressure ring 5 and the electrode post 3 can be made of metal. The pressure ring 5 can be at least one of the following metals: copper, copper alloy, aluminum, aluminum alloy, etc. The electrode post can also be at least one of the following metals: copper, copper alloy, aluminum, aluminum alloy, etc. The welding between the pressure ring 5 and the electrode post 3 can be copper-copper welding or copper-aluminum welding. Copper and copper alloys usually have high melting points, which will generate a lot of heat when welding the pressure ring 5 and the electrode post 3.

[0080] Therefore, by positioning the body 61 of the heat insulation component 6 between the second surface 22 and the pressure ring 5 along the axial direction of the electrode post 3, the heat transferred from the pressure ring 5 to the lower insulation component 2 is effectively reduced, and the probability of the lower insulation component 2 melting due to heat during welding of the pressure ring 5 and the electrode post 3 is reduced. This reduces the probability of the seal 4 not being properly compressed due to the lower insulation component 2 melting due to heat, resulting in better safety performance of the secondary battery.

[0081] The first support portion 62 is disposed on the side of the body 61 facing the second surface 22, and the first support portion 62 abuts against the second surface 22, so that a gap is formed between the body 61 and the second surface 22 along the axial direction of the electrode post 3. This allows an air insulation layer to be formed between the body 61 and the second surface 22 of the lower insulating member 2, further reducing the heat transferred from the pressure ring 5 to the lower insulating member 2, further reducing the probability of the lower insulating member 2 melting due to heat, and making the safety performance of the secondary battery better.

[0082] The sealing element 4 is sleeved on the outer peripheral surface of the pole post 3 and is located between the side of the top cover 1 away from the first surface 21 and the flange 33 along the axial direction of the pole post 3. That is, the sealing element 4 seals between the top cover 1 and the pole post 3. When the weld seal between the pole post 3 and the pressure ring 5 fails, the sealing ring can still make the top cover assembly 10 have good airtightness, so that the secondary battery assembled with the top cover assembly 10 can still have good sealing performance, and the secondary battery has better safety performance.

[0083] Among them, the heat insulation component 6 is a heat insulation component with high hardness, so that the heat insulation component 6 is not prone to deformation along the axial direction of the pole post 3 when squeezed by the pressure ring 5, which is beneficial to improving the stability of the compression amount of the seal 4.

[0084] In addition, the material of the heat insulation component 6 can be any one of extruded polystyrene, polyetherketone, polytetrafluoroethylene, etc., and there is no limitation here.

[0085] The first support portion 62 described above can be implemented in various ways. In one possible implementation, such as... Figure 6a As shown, the first support portion 62 includes a support ring, which is circumferentially disposed on the surface of the body 61 facing the second surface 22 along the third through hole 63.

[0086] Therefore, the structure of the first support part 62 can be relatively simple and easy to implement.

[0087] The support ring can be any of the following: circular ring, elliptical ring, rectangular ring, rhomboid ring, hexagonal ring, etc., and there is no limitation on it.

[0088] The support ring includes a first sub-support ring 621 and a second sub-support ring 622 coaxially arranged. The first sub-support ring 621 and the second sub-support ring 622 are arranged radially spaced on the side of the body 61 facing the second surface 22.

[0089] Therefore, when the body 61 of the heat insulation component 6 is compressed, each part of the body 61 can be supported by the first support part 62, and it is not easy for it to tilt. This allows each part of the body 61 and the lower insulation component 2 to form an air insulation layer, further reducing the probability of the lower insulation component 2 melting due to the welding of the pressure ring 5.

[0090] The first sub-support ring 621 and the second sub-support ring 622 may be coaxial or non-coaxial, and this is not limited here. The structures of the first sub-support ring 621 and the second sub-support ring 622 may be substantially the same or different, and this is not limited here either.

[0091] Optionally, the first sub-support ring 621 may be located near the third through hole 63, and the second sub-support ring 622 may be located near the outer peripheral edge of the body 61.

[0092] Therefore, the edge of the body 61 near the third through hole 63 and the outer peripheral edge are not easily deformed when subjected to pressure. This makes the heat insulation effect of the air insulation layer formed by the edge of the body 61 and the lower insulating member 2 and the air insulation layer formed by the other parts of the body 61 and the lower insulating member 2 basically the same, further reducing the probability of the lower insulating member 2 melting due to the welding of the pressure ring 5.

[0093] It should be explained that the above-mentioned arrangement of the first sub-support ring 621 near the third through hole 63 can be that the first sub-support ring 621 is located at the edge of the third through hole 63, or that there is a certain distance between the first sub-support ring 621 and the edge of the third through hole 63. It is not limited here.

[0094] It should also be explained that the second sub-support ring 622 is located close to the outer periphery of the body 61. This can mean that the second sub-support ring 622 is located at the outer periphery of the body 61, or that there is a certain distance between the second sub-support ring 622 and the outer periphery of the body 61. This is not limited here.

[0095] In another possible implementation of the first support portion 62, such as Figure 6b As shown, the first support portion 62 includes a plurality of first support protrusions 623, which are spaced apart along the circumference of the body 61 on one side of the body 61 facing the second surface 22.

[0096] This allows for gaps between a larger area on the main body 61 and the lower insulating component 2, making it less likely for heat to be transferred from the pressure ring 5 to the lower insulating component 2, further reducing the chance of the lower insulating component 2 melting due to heat, and thus improving the safety performance of the secondary battery.

[0097] The first supporting protrusion 623 can be any of the following: prism structure, cylindrical structure, frustum structure, etc., and is not limited here.

[0098] The number of the first support protrusions 623 can be two, three or more, and there is no limitation here.

[0099] In some embodiments, the first support portion 62 protrudes from the body 61 along the axial direction of the pole post 3 by a height A (e.g., Figure 5 As shown in the figure, A≥0.05mm.

[0100] This allows for a larger gap between the body 61 along the axial direction of the electrode post 3 and the second surface 22, enabling the formation of a larger air insulation layer along the axial direction of the electrode post 3 between the body 61 and the second surface 22 of the lower insulator 2. This further reduces the heat transferred from the pressure ring 5 to the lower insulator 2, further reducing the probability of the lower insulator 2 melting due to heat, thus improving the safety performance of the secondary battery.

[0101] The height of the first support part 62 protruding from the body 61 along the axial direction of the pole post 3 can be 0.05mm, 0.06mm, 0.07mm, etc., and is not limited here.

[0102] In other embodiments, such as Figure 6a and Figure 7As shown, at least one clearance hole 25 is provided on the lower insulating member 2; at least one second support part 64 is also provided on the side of the body 61 facing the lower insulating member 2, the second support part 64 passes through the clearance hole 25 and abuts against the second surface 22 of the top cover 1.

[0103] Therefore, by having the second support portion 64 of the heat insulation component 6 abut against the top cover 1, the distance between the pressure ring 5 and the top cover 1 can also be separated by the heat insulation component 6. Even if the lower insulating component 2 is heated and melted and thinned, the heat insulation component 6 can still prevent the pressure ring 5 from being pressed too much towards the top cover 1. This ensures that the step height difference between the pressure ring 5 and the electrode post 3 meets the requirements, preventing the connecting piece from arching and deforming during subsequent welding of the connecting piece, and effectively improving the performance of the secondary battery.

[0104] The second support portion 64 includes a plurality of second support protrusions, which are spaced apart along the circumference of the body 61 on one side of the body 61 facing the second surface 22.

[0105] Therefore, the structure of the second support part 64 is relatively simple and easy to implement; and, the multiple second support protrusions are arranged at intervals along the circumference of the body 61 on the side of the body 61 facing the second surface 22, which makes the support of the second support part 64 on the body 61 more stable, thereby making it less likely that the pressure ring 5 will be pressed too much in the direction of the top cover 1.

[0106] The number of second support protrusions can be two, three, or more, and is not limited here. For example, the number of second support protrusions can be six, and the six second support protrusions are evenly spaced on the body 61 along the circumference.

[0107] In some embodiments, such as Figure 5 , Figure 8 and Figure 9 As shown, the edge of the second through hole 23 extends toward the top cover 1 with a protrusion 24. Along the radial direction of the pole post 3, the protrusion 24 is located between the outer peripheral surface of the pole post 3 and the hole wall of the first through hole 11.

[0108] Therefore, the protrusion 24 can insulate the terminal post 3 from the top cover 1. Compared with setting the sealing element 4 between the outer peripheral surface of the terminal post 3 and the hole wall of the first through hole 11, the protrusion 24 is less likely to be misaligned during the assembly of the top cover assembly 10, which makes the insulation between the terminal post 3 and the top cover 1 more reliable, effectively reducing the occurrence of short circuits between the terminal post 3 and the top cover 1, and improving the safety performance of the secondary battery.

[0109] The protrusion 24 can extend along the axial direction of the pole post 3 or in a direction that forms an angle with the axial direction of the pole post 3, as long as it extends toward the top cover 1 and is located in the radial direction of the pole post 3 between the outer peripheral surface of the pole post 3 and the wall of the first through hole 11.

[0110] Optionally, such as Figure 8 and Figure 9 As shown, along the axial direction of the pole post 3, the seal 4 is at least partially opposite the protrusion 24 and has a first gap with the protrusion 24 (e.g., Figure 8 (The spacing shown in E).

[0111] Therefore, it can effectively prevent the lower insulating part 2 from pressing the heat insulation part 6 with a large force due to the pressure of the sealing part 4 on the protrusion 24, and avoid the large amount of heat transferred to the lower insulating part 2 due to the pressure of the lower insulating part 2 on the heat insulation part 6. This effectively reduces the risk of the lower insulating part 2 melting due to heat and further improves the safety performance of the secondary battery.

[0112] The first gap between the seal 4 and the protrusion 24 along the axial direction of the pole post 3 can be implemented in various ways. In one possible implementation, such as... Figure 8 As shown, along the axial direction of the pole post 3, the protrusion 24 is lower than the surface of the top cover 1 that abuts against the seal 4, so that a first gap is formed between the protrusion 24 and the seal 4. This makes the implementation of the first gap simple and easy to achieve.

[0113] In another possible implementation, such as Figure 9 As shown, along the axial direction of the pole post 3, the seal 4 is provided with a first groove 41 at a position corresponding to the protrusion 24, so that a first gap is formed between the protrusion 24 and the bottom wall of the first groove 41.

[0114] This reduces the dimensional requirements of the protrusion 24 along the axial direction of the pole post 3, reduces the manufacturing difficulty of the lower insulating member 2, and lowers the cost.

[0115] In some embodiments, such as Figure 5 As shown, the first heat insulation layer 8 is coated on the side of the flange 33 that abuts against the seal 4, and the projection of the seal 4 on the flange 33 along the axial direction of the pole post 3 is located on the first heat insulation layer 8.

[0116] Therefore, the heat transferred from the electrode post 3 to the seal 4 can be reduced by the first heat insulation layer 8, which effectively reduces the possibility of heat damage to the seal 4 and improves the airtightness of the top cover assembly 10, so that the secondary battery assembled with the top cover assembly 10 can still have good sealing performance, thereby making the secondary battery have better safety performance.

[0117] The first heat insulation layer 8 can be fully coated on the side of the flange 33 that abuts against the seal 4, or the first heat insulation layer 8 can be coated on a partial area of ​​the side of the flange 33 that abuts against the seal 4. As long as the projection of the seal 4 along the axial direction of the pole post 3 on the flange 33 is located on the first heat insulation layer 8, there is no limitation here.

[0118] The first heat insulation layer 8 can be any one of UV (Ultra-Violet Ray) coating, ceramic fiber heat insulation coating, silicate heat insulation coating, etc. Preferably, the first heat insulation layer 8 can be a UV coating, which can be applied to the surface of the flange 33 that abuts against the seal 4 by inkjet printing. It is easy to operate and implement. The heat transfer coefficient of the UV coating can be 0.2W / mk, but it can also be other lower heat transfer coefficients, which are not limited here.

[0119] In addition, the thickness of the first heat insulation layer 8 is 50um to 200um.

[0120] Therefore, the thickness of the first heat insulation layer 8 is not too thick, which would affect the compression of the seal 4, nor is the thickness of the first heat insulation layer 8 too thin, which would cause more heat to be transferred from the pole 3 to the seal 4. That is to say, the thickness of the first heat insulation layer 8 is between 50um and 200um, which can make the seal 4 have good sealing performance and good heat insulation effect.

[0121] The thickness of the first heat insulation layer 8 can be 50um, 100um, 150um, 200um, etc., and is not limited here.

[0122] In some embodiments, such as Figure 5 As shown, a groove 26 is provided on the second surface 22, and the pressure ring 5 is at least partially housed in the groove 26. The heat insulation member 6 is located between the bottom wall of the groove 26 and the pressure ring 5. The outer peripheral surface of the pressure ring 5 corresponds to the side wall of the groove 26 along the radial direction of the pole post 3. A first chamfer 51 is provided on the outer peripheral edge of the pressure ring 5. A second groove 261 is provided on the side wall of the groove 26 so that a second gap is formed between at least a portion of the side wall and the outer peripheral surface of the pressure ring 5.

[0123] This allows the top cover assembly 10 to have a smaller dimension along the axial direction of the electrode post 3, thus enabling the top cover assembly 10 to occupy less space along the axial direction of the electrode post 3, which is beneficial for the lightweight and thin design of the secondary battery.

[0124] Furthermore, by providing a first chamfer 51 on the outer peripheral edge of the pressure ring 5 and a second groove 261 on the sidewall of the sink 26, a second gap is formed between at least a portion of the sidewall and the outer peripheral surface of the pressure ring 5. This effectively reduces the contact area between the pressure ring 5 and the sidewall of the sink 26, thereby effectively reducing the heat transferred from the outer peripheral surface of the pressure ring 5 to the lower insulating component 2, further reducing the probability of the lower insulating component 2 melting due to heat, thus improving the safety performance of the secondary battery.

[0125] The chamfer angle of the first chamfer 51 can be 45°, 30°, 60°, etc., and is not limited here.

[0126] In addition, the cross-sectional shape of the second groove 261 can be any of the following: triangle, trapezoid, rectangle, semicircle, etc., and is not limited here.

[0127] Optionally, a second heat-insulating layer may be coated on the sidewall of the groove. This reduces the amount of heat transferred from the outer circumferential surface of the pressure ring 5 to the lower insulating component, thereby reducing the likelihood of the lower insulating component 2 melting due to heat and improving the safety performance of the secondary battery.

[0128] The implementation method of the second heat insulation layer is roughly the same as that of the first heat insulation layer 8. For details, please refer to the above, and will not be repeated here.

[0129] In addition, the outer peripheral surface 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 second through hole 23 has a second planar structure, and the hole wall of the third through hole 63 has a third planar structure. The first planar structure abuts against the second planar structure and the third planar structure respectively. The outer peripheral surface of the body 61 has a fourth planar structure, and the side wall of the groove 26 has a fifth planar structure. The fourth planar structure abuts against the fifth planar structure.

[0130] This allows the torque received by the terminal post 3 to be transmitted to the top cover 1 and the lower insulating component 2, as well as to the lower insulating component 2 through the heat insulation component 6, effectively improving the torsional resistance of the terminal post 3 and contributing to the improvement of the performance of the secondary battery.

[0131] The first planar structure can be a hexagonal, pentagonal, quadrilateral, octagonal, etc., and is not limited here. The corresponding second and third planar structures can be roughly the same as the first planar structure. The fourth planar structure can be a quadrilateral, hexagonal, pentagonal, octagonal, etc., and is not limited here. The corresponding fifth planar structure can be roughly the same as the fourth planar structure.

[0132] The aforementioned sealing element 4 can be a sealing ring, which is fitted onto the outer circumferential surface of the pole post 3. A second chamfer can be provided at the edge of the inner hole of the sealing ring so that when the sealing ring is placed on the pole post 3, the second chamfer can play a certain guiding role, making the installation of the sealing element 4 quicker and more convenient.

[0133] In addition, the top cover assembly 10 also includes an upper insulating member 9, which has a mounting hole and is fitted onto the outer peripheral surface of the pole post 3 through the mounting hole. Along the axial direction of the pole post 3, the upper insulating member 9 is located between the flange 33 and the top cover 1, that is, one side of the upper insulating member 9 abuts against the flange 33 and the other side abuts against the top cover 1, so as to prevent short circuit between the pole post 3 and the top cover 1 and improve the safety of the secondary battery.

[0134] Optionally, the seal 4 can be located between the outer peripheral surface of the pole post 3 and the wall of the mounting hole, so that the upper insulating part 9 can provide a certain protection for the seal 4, which is conducive to improving the sealing stability of the seal 4 and improving the safety performance of the secondary battery.

[0135] This application also provides an energy storage device, such as Figure 10 As shown, the device includes a housing 30, a battery cell 20, and a top cover assembly 10 according to any of the above embodiments. The housing 30 has a receiving cavity and an opening communicating with the receiving cavity; the battery cell 20 is housed in the receiving cavity; and the top cover assembly 10 is sealed at the opening, and the pressure ring 5 is electrically connected to the battery cell 20.

[0136] In this embodiment, the top cover assembly 10 of the energy storage device 100 is the top cover assembly 10 described in the above embodiments. Therefore, the top cover assembly 10 in this embodiment has the technical effects of the top cover assembly 10 in the above embodiments. Since the technical effects of the top cover assembly 10 have been fully explained in the above embodiments, they will not be repeated here.

[0137] This application also provides an electrical system, such as Figure 11 As shown, an energy storage device 100 includes any of the above embodiments.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 top cover assembly, characterized in that, include: Top cover, the top cover having a first through hole; The lower insulating member includes a first surface and a second surface facing away from each other, and a second through hole penetrating the first surface and the second surface. The first surface abuts against the top cover, and the second through hole corresponds to the position of the first through hole. The pole post has a first end and a second end, the second end passing through the first through hole and the second through hole in sequence, and the first end extending radially along the pole post to form a flange; A sealing element is sleeved on the outer peripheral surface of the pole post and is located along the axial direction of the pole post between the side of the top cover facing away from the first surface and the flange. A pressure ring, which is welded to the second end; as well as, A heat insulation component, comprising a body, at least one first support portion and a third through hole, wherein the body is sleeved on the outer peripheral surface of the pole post through the third through hole and is disposed between the second surface and the pressure ring along the axial direction of the pole post; the first support portion is disposed on the side of the body facing the second surface and abuts against the second surface, so that a gap is formed between the body and the second surface along the axial direction of the pole post. A groove is provided on the second surface, and the pressure ring is at least partially housed in the groove. The heat insulation member is located between the bottom wall of the groove and the pressure ring. The outer peripheral surface of the pressure ring corresponds to the side wall of the groove along the radial direction of the pole post. A first chamfer is provided on the outer peripheral edge of the pressure ring. A second groove is provided on the side wall of the groove so that at least a portion of the side wall and the outer peripheral surface of the pressure ring form a second gap.

2. The top cover assembly according to claim 1, characterized in that, The first support portion includes a support ring, which is circumferentially disposed on one side of the body facing the second surface along the third through hole.

3. The top cover assembly according to claim 2, characterized in that, The support ring includes a first sub-support ring and a second sub-support ring coaxially arranged, with the first sub-support ring and the second sub-support ring being radially spaced along the pole post on one side of the body facing the second surface.

4. The top cover assembly according to claim 3, characterized in that, The first sub-support ring is positioned close to the third through hole, and the second sub-support ring is positioned close to the outer peripheral edge of the body.

5. The top cover assembly according to claim 1, characterized in that, The first support portion includes a plurality of first support protrusions, which are spaced apart circumferentially on one side of the body facing the second surface.

6. The top cover assembly according to any one of claims 1-5, characterized in that, The edge of the second through hole extends toward the top cover with a protrusion, which is located between the outer peripheral surface of the pole post and the wall of the first through hole along the radial direction of the pole post.

7. The top cover assembly according to claim 6, characterized in that, Along the axial direction of the pole, the seal is at least partially opposite the protrusion and has a first gap from the protrusion.

8. The top cover assembly according to claim 7, characterized in that, Along the axial direction of the pole post, the protrusion is lower than the surface of the top cover that abuts against the seal, so that the first gap is formed between the protrusion and the seal, and / or, Along the axial direction of the pole, the seal is provided with a first groove at a position corresponding to the protrusion, so that the first gap is formed between the protrusion and the bottom wall of the first groove.

9. The top cover assembly according to any one of claims 1-5, characterized in that, A first heat insulation layer is coated on the side of the flange that abuts against the seal, and the projection of the seal on the flange along the axial direction of the pole is located on the first heat insulation layer.

10. The top cover assembly according to any one of claims 1-5, characterized in that, The lower insulating member is provided with at least one clearance hole; At least one second support portion is provided on the side of the main body facing the lower insulating member. The second support portion passes through the clearance hole and abuts against the second surface of the top cover.

11. The top cover assembly according to any one of claims 1-5, characterized in that, The outer peripheral surface of the pole located between the flange and the pressure ring has a first planar structure, the hole wall of the second through hole has a second planar structure, and the hole wall of the third through hole has a third planar structure. The first planar structure abuts against the second planar structure and the third planar structure, respectively. The outer peripheral surface of the body has a fourth planar structure, and the sidewall of the settling tank has a fifth planar structure, with the fourth planar structure abutting against the fifth planar structure.

12. 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 1-11, wherein the top cover assembly is sealed at the opening, and the pressure ring is electrically connected to the battery cell.

13. An electrical system, characterized in that, Includes the energy storage device as described in claim 12.

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