End cover assembly, energy storage device and electric equipment

Abstract

The utility model discloses an end cover assembly, an energy storage device and electric equipment. The end cover assembly comprises an end plate, an upper insulating part, a pole, a welding ring and a sealing ring. The first surface and the second surface are oppositely arranged in the thickness direction of the end plate, and the mounting hole penetrates through the end plate. The upper insulating part comprises a first ring part arranged in the mounting hole, the inner circumferential side surface of the first ring part is provided with a first inner conical surface, and the first inner conical surface defines a through hole; the pole is arranged in the through hole in a penetrating manner; in the direction from the first surface to the second surface, the generatrix of the first inner conical surface is gradually far away from the axis of the pole; the welding ring is connected to one end of the pole extending out of the second surface; the sealing ring comprises a first sealing ring and a second sealing ring, the first sealing ring is arranged in the through hole and sleeves the periphery of the pole, the peripheral side surface of the first sealing ring is provided with a first outer conical surface matched with the first inner conical surface, and the second sealing ring is connected to the peripheral surface of the first sealing ring in a surrounding manner and is sealed between the welding ring and the end plate.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular, to an end cover assembly, an energy storage device including the end cover assembly, and an electrical device including the energy storage device. Background Art

[0002] The battery includes a shell, an electrode assembly disposed in the shell, an electrolyte that immerses the electrode assembly, and an end cap assembly that seals the electrode assembly and the electrolyte in the shell. However, when the battery is in some harsh environments, the sealing performance of the end cap assembly will decrease, which will lead to electrolyte leakage. Utility Model Content

[0003] The embodiments of the present application provide an end cover assembly, an energy storage device, and an electrical device that can improve the sealing performance, so as to solve the problem of easy leakage of electrolyte existing in the related art.

[0004] The end cap assembly of the embodiment of the present application includes:

[0005] An end plate, comprising a first surface and a second surface disposed opposite to each other in a thickness direction of the end plate, and the end plate further comprising a mounting hole penetrating the first surface and the second surface;

[0006] The upper insulating member comprises a first ring portion installed in the mounting hole, wherein the inner peripheral side surface of the first ring portion has a first inner conical surface, and the first inner conical surface forms a through hole;

[0007] A pole is inserted into the through hole; wherein, in the direction from the first surface to the second surface, the generatrix of the first inner conical surface gradually moves away from the axis of the pole;

[0008] a welding ring connected to one end of the pole extending from the second surface; and

[0009] The sealing ring comprises a first sealing ring and a second sealing ring, wherein the first sealing ring is installed in the through hole and sleeved on the outer periphery of the pole, the outer peripheral side surface of the first sealing ring has a first outer conical surface matching the first inner conical surface, and the second sealing ring is connected to the outer peripheral surface of the first sealing ring and sealed between the welding ring and the end plate.

[0010] In the end cap assembly of the embodiment of the present application, the upper insulating member has a first inner conical surface, the first sealing ring of the sealing ring extends into the through hole surrounded by the first inner conical surface, and has a first outer conical surface, and the first outer conical surface is adapted to the first inner conical surface. On the one hand, the first sealing ring is sleeved on the outer periphery of the pole and extends into the through hole surrounded by the first inner conical surface. The first sealing ring and the first ring portion form a more stable sealing structure, thereby improving the sealing performance of the sealing ring and the upper insulating member; on the other hand, by utilizing the thermal expansion effect of the sealing ring itself, the first sealing ring can provide support force to the first ring portion of the upper insulating member, thereby alleviating the pressure exerted on the upper insulating member by the pole or external factors, and preventing the upper insulating member from being deformed due to pressure and affecting the sealing performance; on the other hand, when the first sealing ring is installed in the through hole, the first outer conical surface cooperates with the first inner conical surface for guidance, thereby facilitating the first sealing ring to align with the through hole, thereby improving assembly efficiency.

[0011] Optionally, the pole includes:

[0012] A column is inserted into the through hole, and the first sealing ring is sleeved on the outer circumference of the column; and

[0013] The flange ring is connected to the outer peripheral surface of one end of the column extending out of the first surface; the first sealing ring is sandwiched between the flange ring and the welding ring.

[0014] In the embodiment of the present application, the first sealing ring is sandwiched between the flange ring and the welding ring, which helps to maintain the shape of the sealing ring when the sealing ring expands thermally, thereby ensuring the sealing performance of the sealing ring.

[0015] Optionally, the hole wall of the mounting hole has a second inner conical surface, and the outer peripheral side surface of the first ring portion has a second outer conical surface matching the second inner conical surface.

[0016] Optionally, it is characterized in that the generatrix of the second inner conical surface is parallel to the generatrix of the first inner conical surface.

[0017] In the embodiment of the present application, when the sealing ring undergoes thermal expansion, the first ring portion can be stably sandwiched between the first sealing ring and the hole wall of the mounting hole, thereby preventing the first ring portion from deforming and affecting the sealing performance.

[0018] Optionally, a target angle is formed between a generatrix of the first inner conical surface and an axis of the pole, and the target angle is between 15° and 45°.

[0019] In the embodiment of the present application, the target angle is between 15° and 45°, which not only increases the mechanical strength of the sealing ring, but also helps to maintain the shape and sealing performance of the sealing ring when the sealing ring undergoes thermal expansion.

[0020] Optionally, the second sealing ring has an annular slot on a side facing the end plate, and part of the first ring portion is inserted into the annular slot.

[0021] In the embodiment of the present application, the second sealing ring has an annular slot for inserting a portion of the first ring portion. The provision of the annular slot significantly reduces the difficulty of assembling the sealing ring before stress is released.

[0022] Optionally, the groove side surface of the annular slot has a third inner conical surface, and the third inner conical surface is flush with the first outer conical surface.

[0023] Optionally, the first sealing ring has an annular end surface facing away from the welding ring and an inner circumferential surface attached to the pole, and a vertical distance from a connection between the annular end surface and the first outer conical surface to the inner circumferential surface is a first distance;

[0024] The vertical distance from the connection between the groove bottom surface of the annular slot and the third inner conical surface to the inner circumferential surface is the second distance;

[0025] The ratio of the first distance to the second distance is between 1 / 2 and 3 / 4.

[0026] In the embodiment of the present application, the ratio of D1 to D2 is between 1 / 2 and 3 / 4, which not only increases the mechanical strength of the sealing ring, but also helps to maintain the shape and sealing performance of the sealing ring when the sealing ring undergoes thermal expansion.

[0027] Optionally, the groove side surface of the annular slot has a fourth inner conical surface that matches the second outer conical surface of the first ring portion.

[0028] In the embodiment of the present application, the third inner conical surface of the annular slot is matched with the second inner conical surface of the first ring portion, and the fourth inner conical surface of the annular slot is matched with the second outer conical surface of the first ring portion. In this way, the end plate, the upper insulating member and the sealing ring form a more stable sealing structure to further improve the sealing performance.

[0029] The energy storage device of the embodiment of the present application includes:

[0030] A housing, comprising a receiving cavity having an opening;

[0031] an electrode assembly, accommodated in the accommodating cavity; and

[0032] The end cover assembly described in any of the above items closes the opening of the accommodating cavity.

[0033] The electrical equipment of the embodiment of the present application includes the above-mentioned energy storage device, and the energy storage device supplies power to the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Shown is a structural schematic diagram of a household energy storage system.

[0035] Figure 2 Shown is a schematic diagram of an exploded view of a single cell according to an embodiment of the present application.

[0036] Figure 3 Shown is a schematic diagram of an exploded view of an end cover assembly according to an embodiment of the present application.

[0037] Figure 4 Shown is a top view of an end cap assembly according to an embodiment of the present application.

[0038] Figure 5 Shown is the Figure 4 Partial section view along the AA cutting line.

[0039] Figure 6 Shown is a three-dimensional schematic diagram of a sealing ring according to an embodiment of the present application.

[0040] Figure 7 Shown is a three-dimensional schematic diagram of an upper insulating member according to an embodiment of the present application.

[0041] Figure 8 Shown is a cross-sectional view of the upper insulating member and the sealing ring after assembly.

[0042] Fig. 9 Shown is a schematic diagram of an electrical device according to an embodiment of the present application.

[0043] The reference numerals are described as follows:

[0044] 1. Energy storage device; 2. Electric energy conversion device; 3. User load; 4. Electrical equipment;

[0045] 10. Shell; 11. Accommodating chamber; 12. Opening; 20. Electrode assembly; 30. End cap assembly;

[0046] 100, end plate; 101, first surface; 102, second surface; 103, mounting hole; 103a, second inner conical surface; 105, air leakage hole; 106, injection hole; 107, sink;

[0047] 200, pole; 210, column; 220, flange ring;

[0048] 300, upper insulating member; 310, first ring portion; 311, first inner conical surface; 3111, through hole; 312, second outer conical surface; 320, second ring portion; 321, first ring segment; 322, second ring segment;

[0049] 400, sealing ring; 410, first sealing ring; 411, first outer conical surface; 412, annular end surface; 413, inner circumferential surface; 420, second sealing ring; 421, annular slot; 421a, third inner conical surface; 421b, groove bottom surface; 421c, fourth inner conical surface;

[0050] 500, welding ring;

[0051] 600, lower insulating member;

[0052] 700. Explosion-proof valve. DETAILED DESCRIPTION

[0053] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0054] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or components that are inherent to these processes, methods, products, or devices.

[0055] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same way or convert it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0056] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0057] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0058] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0059] Take the household energy storage scenario in user-side energy storage as an example to illustrate. Figure 1 A household energy storage system is shown, which includes an energy storage device 1 and an electric energy conversion device 2 (such as a photovoltaic panel), and a user load 3 (such as a street lamp, household appliances, etc.). The energy storage device 1 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the electric energy conversion device 2 can convert solar energy into electric energy during the period of low electricity prices, and store it through the energy storage device 1, and then supply the user load 3 for use during the peak electricity price, or supply the user load 3 for use when the power grid is out of power / power outage.

[0060] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 1 includes at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where electric energy is scarce for use.

[0061] The embodiment of the present application provides an energy storage device 1, which can be but is not limited to a single cell (secondary battery), a battery module, a battery pack, a battery system, etc. composed of single cells. As for the single cell, it can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The single cell can be cylindrical, flat, rectangular, etc., and the embodiment of the present application does not limit this. Next, taking the energy storage device 1 as a rectangular single cell as an example, the energy storage device 1 is explained in detail.

[0062] like Figure 2As shown, the energy storage device 1 of the embodiment of the present application includes a housing 10, an electrode assembly 20 and an end cap assembly 30. The housing 10 includes a housing cavity 11 having an opening 12, the electrode assembly 20 is accommodated in the housing cavity 11, and the end cap assembly 30 is connected to the housing 10 and closes the opening 12 of the housing cavity 11.

[0063] The shell 10 may be a cylindrical structure with an opening 12 at one end, and the energy storage device 1 includes an end cover assembly 30, which seals the opening 12. Of course, the shell 10 may also be a cylindrical structure with openings 12 at both ends, and the energy storage device 1 may include an end cover assembly 30 and a cover plate, or the energy storage device 1 includes two end cover assemblies 30, so that one end cover assembly 30 and one cover plate, or two end cover assemblies 30 can seal the two openings 12 of the shell 10 respectively.

[0064] Optionally, the housing 10 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film.

[0065] Among them, the electrode assembly 20 includes a positive electrode sheet, a negative electrode sheet and a separator. The single cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon. The material of the isolation film may be PP or PE, etc. In addition, the electrode assembly 20 may be a winding structure or a stacked structure, but the embodiment of the present application is not limited thereto.

[0066] like Figure 3 As shown, the end cover assembly 30 includes an end plate 100 and an explosion-proof valve 700. The end plate 100 is connected to the housing 10 and seals the opening 12 of the accommodating chamber 11. The connection between the end plate 100 and the housing 10 can be welding, but is not limited to this. The shape of the end plate 100 is adapted to the shape of the opening 12. In the embodiment of the present application, the shape of the opening 12 is rectangular, so the shape of the end plate 100 is also rectangular.

[0067] The end plate 100 has a gas leakage hole 105, and the gas leakage hole 105 penetrates the end plate 100 along the thickness direction of the end plate 100. The explosion-proof valve 700 is connected to the side surface of the end plate 100 facing the electrode assembly 20, and closes the gas leakage hole 105. The explosion-proof valve 700 is used to explode and discharge the gas generated in the accommodating cavity 11 of the shell 10 when the gas pressure of the energy storage device 1 reaches a certain pressure threshold, so as to avoid the battery from bulging and exploding, thereby improving the safety of the energy storage device 1.

[0068] The end plate 100 is also provided with an injection hole 106, which penetrates the end plate 100 along the thickness direction of the end plate 100. After the end cover assembly 30 seals the opening 12 of the accommodating cavity 11, the electrolyte can be injected into the accommodating cavity 11 of the housing 10 through the injection hole 106. After the electrolyte is injected, the injection hole 106 can be sealed with a seal (not shown in the figure) to prevent leakage of the electrolyte.

[0069] like Figures 3 to 5 As shown, the end cap assembly 30 further includes a pole 200 , an upper insulating member 300 , a lower insulating member 600 , a welding ring 500 and a sealing ring 400 .

[0070] The end plate 100 has a first surface 101 and a second surface 102 that are arranged opposite to each other along its thickness direction. The end plate 100 also has a mounting hole 103, and the mounting hole 103, the air leakage hole 105, and the injection hole 106 all penetrate the first surface 101 and the second surface 102. The pole 200 is installed in the mounting hole 103. The upper insulating member 300 surrounds the outer circumference of the pole 200 and is penetrated through the mounting hole 103, and is used to insulate the pole 200 and the end plate 100. The lower insulating member 600 is installed on the side where the second surface 102 of the end plate 100 is located, and is used to insulate the pole 200 and the end plate 100. The welding ring 500 is connected to one end of the pole 200 extending out of the second surface 102, for example, by welding. The sealing ring 400 is sleeved on the outer circumference of the pole 200, and is used to seal the gap between the pole 200 and the hole wall of the mounting hole 103.

[0071] In one embodiment, the end plate 100 may be a plain aluminum sheet, but is not limited thereto. The upper insulating member 300 and the lower insulating member 600 are made of insulating material, such as plastic.

[0072] like Figure 5 As shown, the pole 200 includes a column 210 and a flange ring 220, and the column 210 is installed in the mounting hole 103 of the end plate 100. The welding ring 500 is connected to one end of the column 210, and the flange ring 220 is connected to the other end of the column 210. For example, the flange ring 220 surrounds and is connected to the outer peripheral surface of one end of the column 210 extending from the first surface 101.

[0073] like Figure 5 and Figure 7As shown, the upper insulating member 300 includes a first ring portion 310 and a second ring portion 320 connected to each other. The first ring portion 310 is installed in the mounting hole 103 and is located on the side of the flange ring 220 facing the end plate 100. The inner circumferential side surface of the first ring portion 310 has a first inner conical surface 311, and the first inner conical surface 311 forms a through hole 3111. The pole 200 is inserted into the through hole 3111. The second ring portion 320 is installed on the side where the first surface 101 of the end plate 100 is located, and surrounds the outer circumferential surface of the first ring portion 310. The second ring portion 320 supports and surrounds the flange ring 220 of the pole 200. Among them, along the direction from the first surface 101 to the second surface 102, the generatrix of the first inner conical surface 311 gradually moves away from the axis L of the pole 200.

[0074] The second ring portion 320 may include a first ring segment 321 and a second ring segment 322. The first ring segment 321 is disposed between the flange ring 220 and the first surface 101 of the end plate 100, and one end of the first ring segment 321 is connected to the outer circumference of the first ring portion 310. The second ring segment 322 is connected to the other end of the first ring segment 321 and surrounds the outer circumference of the flange ring 220.

[0075] In one embodiment, the first ring segment 321 and the second ring segment 322 may be vertically connected, but the present invention is not limited thereto.

[0076] like Figure 5 and Figure 6 As shown, the sealing ring 400 includes a first sealing ring 410 and a second sealing ring 420. The first sealing ring 410 is installed in the through hole 3111 and is sleeved on the outer periphery of the column 210 of the pole 200. The outer peripheral side surface of the first sealing ring 410 has a first outer conical surface 411 that matches the first inner conical surface 311. The second sealing ring 420 is connected to the outer peripheral surface of the first sealing ring 410 and is sealed between the welding ring 500 and the end plate 100.

[0077] When assembling the sealing ring 400, the upper insulating member 300, the pole 200 and the welding ring 500, the sealing ring 400 is inserted into the column 210 from the end of the column 210 away from the flange ring 220. As the first sealing ring 410 is gradually inserted into the through hole 3111, the first outer conical surface 411 can be matched and abutted with the first inner conical surface 311. Finally, the welding ring 500 and the column 210 are welded to sandwich the second sealing ring 420 between the welding ring 500 and the end plate 100.

[0078] It can be seen that in the end cover assembly 30 of the embodiment of the present application, the upper insulating part 300 has a first inner conical surface 311, the first sealing ring 410 of the sealing ring 400 extends into the through hole 3111 surrounded by the first inner conical surface 311, and has a first outer conical surface 411, and the first outer conical surface 411 is adapted to the first inner conical surface 311. On the one hand, the first sealing ring 410 is sleeved on the outer circumference of the pole 200 and extends into the through hole 3111 surrounded by the first inner conical surface 311. The first sealing ring 410 and the first ring portion 310 form a more stable sealing structure, thereby improving the sealing performance of the sealing ring 400 and the upper insulating member 300; on the other hand, by utilizing the thermal expansion effect of the sealing ring 400 itself, the first sealing ring 410 can provide support force for the first ring portion 310 of the upper insulating member 300, thereby alleviating the pressure exerted on the upper insulating member 300 by the pole 200 or external factors, and preventing the upper insulating member 300 from being deformed due to pressure and affecting the sealing performance; on the other hand, when the first sealing ring 410 is installed in the through hole 3111, the first outer conical surface 411 and the first inner conical surface 311 are guided and matched, thereby facilitating the first sealing ring 410 to align with the through hole 3111, thereby improving assembly efficiency.

[0079] like Figure 5 As shown, the end plate 100 further has a recessed groove 107, which is recessed from the second surface 102 along the thickness direction of the end plate 100 toward the first surface 101, and the mounting hole 103 passes through the bottom surface of the recessed groove 107. The second sealing ring 420 is disposed in the recessed groove 107.

[0080] like Figure 5 As shown, the first sealing ring 410 is sandwiched between the flange ring 220 and the welding ring 500 .

[0081] In the embodiment of the present application, the first sealing ring 410 is sandwiched between the flange ring 220 and the welding ring 500 , which helps to maintain the shape of the sealing ring 400 when the sealing ring 400 expands thermally, thereby ensuring the sealing performance of the sealing ring 400 .

[0082] like Figure 5 As shown, the hole wall of the mounting hole 103 has a second inner conical surface 103a, and the outer peripheral side surface of the first ring portion 310 has a second outer conical surface 312 that matches the second inner conical surface 103a. Further, the generatrix of the second inner conical surface 103a is parallel to the generatrix of the first inner conical surface 311, that is, the generatrix of the first inner conical surface 311, the generatrix of the first outer conical surface 411, the generatrix of the second inner conical surface 103a, and the generatrix of the second outer conical surface 312 are parallel to each other.

[0083] In the embodiment of the present application, when the sealing ring 400 undergoes thermal expansion, the first ring portion 310 can be stably sandwiched between the first sealing ring 410 and the hole wall of the mounting hole 103, thereby preventing the first ring portion 310 from deforming and affecting the sealing performance.

[0084] It is understandable that in other embodiments, the generatrix of the first inner conical surface 311 may not be parallel to the generatrix of the second outer conical surface 312. For example, the cone angle of the first inner conical surface 311 is greater than or less than the cone angle of the second outer conical surface 312.

[0085] like Figure 5 and Figure 6 As shown, the second sealing ring 420 has an annular slot 421 on one side facing the end plate 100 , and a portion of the first ring portion 310 is inserted into the annular slot 421 .

[0086] In the embodiment of the present application, the second sealing ring 420 has an annular slot 421 for partially inserting the first ring portion 310 . The provision of the annular slot 421 significantly reduces the difficulty of assembling the sealing ring 400 before stress is released.

[0087] The groove side of the annular slot 421 has a third inner conical surface 421a, which is flush with the first outer conical surface 411. The groove side of the annular slot 421 has a fourth inner conical surface 421c that matches the second outer conical surface 312 of the first ring portion 310.

[0088] In the embodiment of the present application, the third inner conical surface 421a of the annular slot 421 is matched with the second inner conical surface 103a of the first ring portion 310, and the fourth inner conical surface 421c of the annular slot 421 is matched with the second outer conical surface 312 of the first ring portion 310. In this way, the end plate 100, the upper insulating member 300 and the sealing ring 400 form a more stable sealing structure to further improve the sealing performance.

[0089] like Figure 8 As shown, a target angle α is formed between the generatrix of the first inner conical surface 311 and the axis L of the pole 200 , and the target angle α is between 15° and 45°, for example, α is 15°, 20°, 25°, 30°, 35°, 40°, or 45°.

[0090] The first sealing ring 410 has an annular end face 412 facing away from the welding ring 500 and an inner circumferential surface 413 fitted to the pole 200, and the vertical distance from the connection between the annular end face 412 and the first outer conical surface 411 to the inner circumferential surface 413 is a first distance D1; the vertical distance from the connection between the groove bottom surface 421b of the annular slot 421 and the third inner conical surface 421a to the inner circumferential surface 413 is a second distance D2; the ratio of D1 to D2 is between 1 / 2 and 3 / 4.

[0091] In the embodiment of the present application, the target angle is between 15° and 45°, and the ratio of D1 to D2 is between 1 / 2 and 3 / 4, which not only increases the mechanical strength of the sealing ring 400, but also helps to maintain the shape and sealing performance of the sealing ring 400 when the sealing ring 400 undergoes thermal expansion.

[0092] like Fig. 9 As shown, the embodiment of the present application further provides an electric device 4, which can be an energy storage device, a vehicle, an energy storage container, etc. The electric device 4 includes the energy storage device 1 described in the above embodiment, and the energy storage device 1 supplies power to the electric device 4. In this way, for the electric device 4 including the energy storage device 1 described above, the working stability of the electric device 4 can be improved, the probability of the electric device 4 downtime can be reduced, and the safety of the use of the electric device 4 can be improved.

[0093] It is understandable that the various embodiments / implementations provided in the present application can be combined with each other without causing any contradiction, and will not be illustrated one by one here.

[0094] In the application embodiments, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0095] In the description of the application embodiments, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the application embodiments.

[0096] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0097] The above are only preferred embodiments of the application embodiments and are not intended to limit the application embodiments. For those skilled in the art, the application embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. An end cap assembly, characterized in that: include: An end plate, comprising a first surface and a second surface disposed opposite to each other in a thickness direction of the end plate, and the end plate further comprising a mounting hole penetrating the first surface and the second surface; The upper insulating member comprises a first ring portion installed in the mounting hole, wherein the inner peripheral side surface of the first ring portion has a first inner conical surface, and the first inner conical surface forms a through hole; A pole is inserted into the through hole; wherein, in the direction from the first surface to the second surface, the generatrix of the first inner conical surface gradually moves away from the axis of the pole; a welding ring connected to one end of the pole extending from the second surface; and The sealing ring comprises a first sealing ring and a second sealing ring, wherein the first sealing ring is installed in the through hole and sleeved on the outer periphery of the pole, the outer peripheral side surface of the first sealing ring has a first outer conical surface matching the first inner conical surface, and the second sealing ring is connected to the outer peripheral surface of the first sealing ring and sealed between the welding ring and the end plate.

2. The end cap assembly according to claim 1, characterized in that: The pole comprises: A column is inserted into the through hole, and the first sealing ring is sleeved on the outer circumference of the column; and The flange ring is connected to the outer peripheral surface of one end of the column extending out of the first surface; the first sealing ring is sandwiched between the flange ring and the welding ring.

3. The end cap assembly according to claim 1, characterized in that: The hole wall of the mounting hole has a second inner conical surface, and the outer peripheral side surface of the first ring portion has a second outer conical surface matching the second inner conical surface.

4. The end cap assembly according to claim 3, characterized in that: The generatrix of the second inner conical surface is parallel to the generatrix of the first inner conical surface.

5. The end cap assembly according to claim 1, characterized in that: A target angle is formed between the generatrix of the first inner conical surface and the axis of the pole, and the target angle is between 15° and 45°.

6. The end cap assembly according to any one of claims 1 to 5, characterized in that: The second sealing ring has an annular slot on one side facing the end plate, and a portion of the first ring portion is inserted into the annular slot.

7. The end cap assembly according to claim 6, characterized in that: The groove side surface of the annular slot has a third inner conical surface, and the third inner conical surface is flush with the first outer conical surface.

8. The end cap assembly according to claim 7, characterized in that: The first sealing ring has an annular end surface facing away from the welding ring and an inner circumferential surface attached to the pole, and a vertical distance from a connection between the annular end surface and the first outer conical surface to the inner circumferential surface is a first distance; The vertical distance from the connection between the groove bottom surface of the annular slot and the third inner conical surface to the inner circumferential surface is the second distance; The ratio of the first distance to the second distance is between 1 / 2 and 3 / 4.

9. The end cap assembly according to claim 6, characterized in that: The groove side surface of the annular slot has a fourth inner conical surface that matches the second outer conical surface of the first ring portion.

10. An energy storage device, characterized in that: include: A housing, comprising a receiving cavity having an opening; An electrode assembly is accommodated in the accommodating cavity; as well as The end cap assembly according to any one of claims 1 to 9, wherein the end cap assembly closes the opening of the accommodating cavity.

11. An electrical device, characterized in that: It includes the energy storage device as described in claim 10, and the energy storage device supplies power to the electrical equipment.

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