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. Wherein the end cover assembly comprises an end cover, lower plastic, a pole and a collector plate, and the lower plastic comprises a lower plastic body and a limiting convex part; the two limiting convex parts are arranged on the second surface in a protruding mode, each limiting convex part comprises a first side wall face, a second side wall face and an end face, the first side wall faces are obliquely arranged, the second side wall faces are obliquely arranged, and the end faces are connected between the first side wall faces and the second side wall faces; each limiting convex part is provided with a flow guide groove; the current collecting disc comprises a connecting part and a disc body part, the disc body part is located on the sides, back to the lower plastic body, of the two limiting convex parts in the thickness direction of the end cover assembly, the orthographic projection of the disc body part on the second surface is located in the lower plastic body, and the orthographic projections of the end faces of the two limiting convex parts on the second surface are both located on the orthographic projection of the disc body part on the second surface. The utilization rate of the electrolyte can be improved.

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 and an electrical equipment. Background Art

[0002] A secondary battery (Rechargeable battery), also known as a rechargeable battery or storage battery, refers to a battery that can be recharged to activate the active material and continue to be used after the battery is discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people have higher requirements for their energy density, reliability and cost. In the prior art, the electrolyte in the energy storage device may enter the gap between the lower plastic and the end cover due to the shaking of the energy storage device, thereby generating liquid accumulation between the gap between the lower plastic and the end cover, resulting in a waste of electrolyte. Utility Model Content

[0003] The present application provides an end cover assembly, an energy storage device and an electrical equipment, which can improve the utilization rate of the electrolyte.

[0004] The first aspect of the present application provides an end cap assembly, comprising an end cap, a lower plastic, a pole and a current collecting plate;

[0005] The lower plastic comprises a lower plastic body and a limiting convex portion, the end cover and the lower plastic body are stacked along the thickness direction of the end cover assembly, the lower plastic body comprises a first surface and a second surface arranged opposite to each other along the thickness direction of the end cover assembly, the first surface faces the end cover, and the second surface faces away from the end cover, and the pole is passed through the end cover and the lower plastic body;

[0006] There are two limiting protrusions, both of which are convexly arranged on the second surface. Along the radial direction of the lower plastic, the two limiting protrusions are symmetrically arranged about the central axis of the lower plastic body;

[0007] Each of the limiting protrusions includes a first side wall surface, a second side wall surface, and an end surface. Along the second surface toward the end surface, one end of the first side wall surface is connected to the periphery of the lower plastic body, and the other end of the first side wall surface extends toward the central axis of the lower plastic body. The second side wall surface is located on a side of the first side wall surface close to the center of the lower plastic body. Along the second surface toward the end surface, one end of the second side wall surface is connected to the second surface, and the other end of the second side wall surface extends toward the central axis of the lower plastic body. The end surface is connected between the first side wall surface and the second side wall surface.

[0008] Each of the limiting protrusions is provided with a guide groove, and along the thickness direction of the end cover assembly, the guide groove runs through the first surface and the end surface;

[0009] The current collecting plate includes a connecting portion and a plate body portion, one end of the connecting portion is connected to the pole, and the other end is connected to the plate body portion, along the thickness direction of the end cover assembly, the plate body portion is located on the side of the two limiting protrusions facing away from the lower plastic body, the orthographic projection of the plate body portion on the second surface is located in the lower plastic body, and the orthographic projections of the end surfaces of the two limiting protrusions on the second surface are both located at the orthographic projection of the plate body portion on the second surface.

[0010] In a possible implementation manner, the disk body portion includes a first side surface, a second side surface and a peripheral side surface, and along the thickness direction of the end cover assembly, the first side surface and the second side surface are arranged back to back, and the peripheral side surface is connected between the first side surface and the second side surface;

[0011] The disc body is provided with a first welding groove and a second welding groove, the first welding groove is formed by the first side surface being recessed toward the second side surface, and the first welding groove passes through the peripheral side surface, the second welding groove is formed by the first side surface being recessed toward the second side surface, and the second welding groove passes through the peripheral side surface, and along the radial direction of the end cover assembly, the first welding groove and the second welding groove are spaced and opposite to each other;

[0012] Along the thickness direction of the end cover assembly, the end faces of the two limiting protrusions are opposite to the first side surface, one guide groove is opposite to and connected with the first welding groove, and the other guide groove is opposite to and connected with the second welding groove.

[0013] In a possible implementation, a plurality of reinforcing ribs are provided in each of the guide grooves, each of the reinforcing ribs is connected to two oppositely disposed groove side walls of the guide groove, and along the length direction of the guide groove, the plurality of reinforcing ribs are spaced apart from each other, and the plurality of reinforcing ribs separate the guide grooves into a plurality of sub-guide grooves.

[0014] In a possible implementation manner, both opposite ends of the first welding groove penetrate through the peripheral side surface, and along the circumferential direction of the end cover assembly, the opposite ends of the first welding groove are spaced apart;

[0015] The opposite ends of the second welding groove both penetrate the peripheral side surface, and the opposite ends of the second welding groove are spaced apart along the circumferential direction of the end cover assembly;

[0016] The sub-guiding grooves at both ends of one of the limiting protrusions are respectively opposite to and connected with the opposite ends of the first welding groove, and the sub-guiding grooves at both ends of the other limiting protrusion are respectively opposite to and connected with the opposite ends of the second welding groove.

[0017] In a possible implementation manner, the disk body further includes a plurality of air holes, and along the height direction of the end cover assembly, each of the air holes penetrates two surfaces of the disk body that are disposed opposite to each other.

[0018] In a possible implementation manner, two oppositely disposed groove side walls of each guide groove are both inclined, and the inclination direction of the two groove side walls is the same as the inclination direction of the first side wall surface.

[0019] In a possible implementation manner, the mounting surface is formed with a first clamping portion, and the first surface is formed with a second clamping portion;

[0020] The first surface is in contact with the mounting surface, and the first clamping portion is clamped with the second clamping portion.

[0021] A second aspect of the present application provides an energy storage device, comprising a housing and the end cover assembly as described above, wherein the housing is provided with a receiving cavity and an opening, and along the height direction of the energy storage device, the opening is located at one end of the receiving cavity, and the opening is communicated with the receiving cavity;

[0022] The end cover is mounted on the opening, the lower plastic is located in the accommodating cavity, and along the radial direction of the energy storage device, the two limiting protrusions are spaced apart from the cavity wall of the accommodating cavity.

[0023] In a possible implementation manner, the energy storage device further includes an electrode assembly, the electrode assembly includes a pole ear, and the pole ear is located at one end of the electrode assembly in a height direction;

[0024] The electrode assembly is accommodated in the accommodating cavity, the pole ear faces the opening, and along the height direction of the energy storage device, the disk body is located between the electrode assembly and the lower plastic, the disk body is stacked on the pole ear, the disk body is electrically connected to the pole ear, the connecting portion is stacked on the side of the disk body facing away from the pole ear, and is limited between the two limiting protrusions, and along the height direction of the energy storage device, the disk body is located inside the electrode assembly in the positive projection of the electrode assembly.

[0025] A third aspect of the present application provides an electrical device, comprising the energy storage device as described above, wherein the energy storage device is used to store electrical energy.

[0026] The beneficial effect of the present application is that when the electrolyte flows to the gap between the lower plastic body and the end cover due to the shaking of the energy storage device, the electrolyte can flow back to the disc body of the current collecting plate through the guide groove, and then flow from the disc body of the current collecting plate to the end face of the electrode assembly to infiltrate the electrode assembly. The two limiting protrusions are arranged obliquely, and the disc body of the current collecting plate is located on the side of the two limiting protrusions facing away from the lower plastic body, and the orthographic projections of the end faces of the two limiting protrusions on the second surface are both located within the orthographic projection of the disc body on the second surface. Guide grooves are formed in both limiting protrusions, and the guide grooves run through the first surface and the end face. When the energy storage device is inverted, the disc body of the current collecting plate can block the guide grooves, reducing the electrolyte from passing through the guide grooves to reach the gap between the lower plastic and the end cover, resulting in a waste of electrolyte. Therefore, the present application can improve the utilization rate of the electrolyte.

[0027] By setting a limiting protrusion on the lower plastic, and when the lower plastic is installed on the shell, the limiting protrusion is limited to the inside of the shell, so that the limiting protrusion can limit the lower plastic, improve the stability of the lower plastic installed on the shell, and prevent the lower plastic from moving relative to the shell along the radial direction of the energy storage device. The two limiting protrusions are both inclined, which can also ensure the assembly effect of the lower plastic and the shell, and avoid the limiting protrusion and the shell from scratching or interfering when the lower plastic is installed on the shell, thereby avoiding abnormal assembly of the lower plastic and the shell. The disk body of the collecting disk is located in the lower plastic body on the second surface. When the end cover assembly is assembled on the shell, it can also avoid interference between the disk body and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the structure of the energy storage device provided in the embodiment of the present application;

[0030] Figure 2 for Figure 1 A schematic diagram of a partially exploded structure of the energy storage device shown;

[0031] Figure 3 for Figure 2 A schematic diagram of a partially exploded structure of an end cap assembly of the energy storage device shown;

[0032] Figure 4 for Figure 3 A schematic diagram of a partially exploded structure of the end cover assembly from another angle;

[0033] Figure 5 for Figure 1A schematic cross-sectional view of a partial structure of the energy storage device shown.

[0034] Description of reference numerals:

[0035] 1000-energy storage device, 400-shell, 300-electrode assembly, 100-end cover assembly, 320-ear, 30-pole, 310-winding core, 10-end cover, 20-lower plastic, 40-explosion-proof valve, 50-explosion-proof disk, 11-penetration surface, 12-installation surface, 13-pole hole, 14-through groove, 15-first clamping part, 31-flange, 32-column, 21-lower plastic body, 22-limiting convex part, 221-first side wall surface, 222-second side wall Surface, 223-end surface, 211-first surface, 212-second surface, 213-pole through hole, 224-guide groove, 225-reinforcement rib, 215-second clamping portion, 214-explosion-proof hole, 23-explosion-proof net, 60-collecting plate, 61-plate body, 62-connecting portion, 611-first side surface, 612-second side surface, 614-air vent, 615-first welding groove, 616-second welding groove, 617-first welding protrusion, 618-second welding protrusion. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] 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 form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. At present, the generation of green electricity generally relies on photovoltaics, wind power, water potential, etc., while wind and solar energy generally have problems of strong intermittency and large volatility, which will cause instability of the power grid, insufficient electricity during peak hours, too much electricity during low hours, and unstable voltage will also cause damage to electricity. Therefore, it may cause "wind and light abandonment" problems due to insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, energy storage must be relied on. That is, electrical energy is converted into other forms of energy by physical or chemical means and stored, and energy is converted into electrical energy and released when needed. In simple terms, energy storage is similar to a large "power bank". When photovoltaic and wind energy are sufficient, electrical energy is stored and the stored electricity is released when needed.

[0038] See also Figure 1 , Figure 1 A schematic diagram of the structure of an energy storage device 1000 provided in an embodiment of the present application. The present application provides an energy storage device 1000, in which a group of chemical batteries are arranged, which mainly utilizes chemical elements in the chemical batteries as energy storage media, and the charging and discharging process is accompanied by chemical reactions or changes in the energy storage media. In simple terms, the electric energy generated by wind energy and solar energy is stored in the chemical batteries, and when the use of external electric energy reaches a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0039] The energy storage device 1000 provided in this application has a wide range of application scenarios, including (wind and solar) power generation side energy storage, grid side energy storage, base station side energy storage, and user side energy storage. The energy storage device 1000 is usually used in the form of energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes, etc., and the energy storage device 1000 is included in the energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes and other equipment.

[0040] It should be noted that the above-mentioned energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes and other equipment containing the energy storage device 1000 can be understood as electrical equipment.

[0041] There may be several energy storage devices 1000, which are connected in series or in parallel. In this embodiment, "several" means two or more.

[0042] The term "conduction" as used in this application refers to electrical connection. The conduction between two conductive parts is equivalent to the electrical connection between the two conductive parts. The structural connection between the two conductive parts includes but is not limited to welding the two conductive parts to each other, the surfaces of the two conductive parts abutting against each other, etc.

[0043] It is understood that the energy storage device 1000 may include but is not limited to energy storage batteries, energy storage modules, energy storage packs, energy storage systems, energy storage clusters, etc. The actual application form of the energy storage device 1000 provided in the embodiment of the present application may be but is not limited to the listed products, and may also be other application forms. The embodiment of the present application does not strictly limit the application form of the energy storage device 1000. The embodiment of the present application only takes the energy storage device 1000 as an energy storage battery as an example for explanation.

[0044] Please refer to Figure 1 and Figure 2 , Figure 2 for Figure 1 A schematic diagram of a partially exploded structure of the energy storage device 1000 is shown. For ease of description, in this application, the height direction of the energy storage device 1000 is defined as the Z-axis direction.

[0045] In this embodiment, the energy storage device 1000 includes a housing 400, an electrode assembly 300 and an end cap assembly 100. The housing 400 includes an opening and a receiving cavity. The electrode assembly 300 is received in the receiving cavity, and the end cap assembly 100 is sealed at the opening. It can be understood that the height direction of the energy storage device 1000 is the thickness direction of the end cap assembly 100.

[0046] The electrode assembly 300 includes a winding core 310 and a tab 320. The winding core 310 is formed by winding together a positive electrode sheet, a negative electrode sheet, and an insulating film located between the positive electrode sheet and the negative electrode sheet. Both the positive electrode sheet and the negative electrode sheet include a first portion coated with an active material and a second portion extending outward from the first portion and not coated with an active material. The tab 320 includes a negative tab and a positive tab, the negative tab corresponds to the second portion of the negative electrode sheet not coated with an active material, and the positive tab corresponds to the second portion of the positive electrode sheet not coated with an active material. Along the height direction of the winding core 310, the negative tab and the positive tab are located at opposite ends of the winding core 310, respectively.

[0047] Please refer to Figure 2 , Figure 3 and Figure 4 , Figure 3 for Figure 2 The schematic diagram of the partial exploded structure of the end cover assembly 100 of the energy storage device 1000 is shown. Figure 4 for Figure 3 The end cap assembly 100 is shown as a partially exploded structural schematic diagram from another angle.

[0048] In this embodiment, the end cap assembly 100 includes an end cap 10, a lower plastic 20, a pole 30 and a current collecting plate 60. The end cap 10 and the lower plastic 20 are stacked and can be fixedly connected, and the lower plastic 20 is used to insulate the end cap 10 and the electrode assembly 300. The pole 30 is inserted through the end cap 10 and the lower plastic 20. The end cap 10 in this embodiment is a bare aluminum part, and the lower plastic 20 is made of plastic material and is insulated. The current collecting plate 60 is located on the side of the lower plastic 20 facing away from the end cap 10. The current collecting plate 60 is used to electrically connect the pole 30 and the pole ear 320 of the electrode assembly 300. The end cap assembly 100 also includes an explosion-proof valve 40 and an explosion-proof disk 50. The explosion-proof valve 40 and the explosion-proof disk 50 are both installed on the end cap 10.

[0049] It can be understood that the pole 30 can be a positive pole or a negative pole. When the pole 30 of the end cap assembly 100 is connected to the negative pole ear of the electrode assembly 300 through the collector plate 60, the pole 30 is a negative pole. When the pole 30 of the end cap assembly 100 is connected to the positive pole ear of the electrode assembly 300 through the collector plate 60, the pole 30 is a positive pole. The embodiment of the present application does not strictly limit this.

[0050] Please continue reading Figure 3 and Figure 4In this embodiment, the end cover 10 is in the shape of a circular plate. The end cover 10 includes a penetration surface 11 and a mounting surface 12. Along the thickness direction of the end cover 10, the penetration surface 11 and the mounting surface 12 are arranged back to back. The end cover 10 is provided with a pole hole 13 and a through groove 14. The pole hole 13 is located in the middle of the end cover 10. Along the thickness direction of the end cover 10, the pole hole 13 penetrates the penetration surface 11 and the mounting surface 12. The pole hole 13 is used for the pole 30 to pass through. The through groove 14 is spaced apart from the pole hole 13. Along the thickness direction of the end cover 10, the through groove 14 penetrates the penetration surface 11 and the mounting surface 12.

[0051] In this embodiment, the explosion-proof valve 40 is installed on the groove wall of the through groove 14 of the end cover 10. The explosion-proof disc 50 is installed on the groove wall of the through groove 14 of the end cover 10. Along the thickness direction (Z-axis direction) of the end cover assembly 100, the explosion-proof disc 50 is close to the penetration surface 11 of the end cover 10 relative to the explosion-proof valve 40. The explosion-proof disc 50 covers the explosion-proof valve 40.

[0052] In this embodiment, the mounting surface 12 of the end cover 10 is formed with a first clamping portion 15. Specifically, the first clamping portion 15 is a groove. Along the thickness direction of the end cover, the first clamping portion 15 is recessed in the mounting surface 12 of the end cover 10. The first clamping portion 15 is used to be clamped and connected with the lower plastic 20. The number of the first clamping portions 15 is two. In other embodiments, the first clamping portion 15 can also be a protrusion; along the thickness direction of the end cover 10, the first clamping portion 15 is protruding on the mounting surface 12 of the end cover 10. The first clamping portion 15 can also be one, three, four or other numbers.

[0053] Please continue reading Figure 3 and Figure 4 The pole 30 includes a flange 31 and a column 32. The column 32 is convexly arranged on the surface of the flange 31 in the thickness direction. The column 32 and the flange 31 are coaxially arranged.

[0054] Please continue reading Figure 3 and Figure 4 In this embodiment, the lower plastic 20 includes a lower plastic body 21 and a limiting protrusion 22. The lower plastic body 21 is in the shape of a circular plate. The lower plastic body 21 includes a first surface 211 and a second surface 212. Along the thickness direction of the lower plastic 20, the first surface 211 and the second surface 212 are arranged in back to back. The lower plastic body 21 has a central axis. The central axis of the lower plastic body 21 is an axis passing through the center of the lower plastic body 21 and extending along the thickness direction of the lower plastic body 21. The lower plastic body 21 is provided with a pole through hole 213. Along the thickness direction of the lower plastic 20, the pole through hole 213 penetrates the first surface 211 and the second surface 212. The pole through hole 213 is used for the pole 30 to pass through. In this embodiment, the hole axis of the pole through hole 213 coincides with the central axis of the lower plastic body 21. In other embodiments, the hole axis of the pole through hole 213 may also deviate from the central axis of the lower plastic body 21.

[0055] The limiting protrusion 22 is roughly in the shape of an arc strip. Along the thickness direction of the lower plastic 20, the limiting protrusion 22 is convexly arranged on the second surface 212 of the lower plastic body 21. There is an angle between the limiting protrusion 22 and the lower plastic body 21. In this embodiment, the limiting protrusion 22 includes a first side wall surface 221, a second side wall surface 222 and an end surface 223. Along the second surface 212 to the end surface 223, one end of the first side wall surface 221 is connected to the periphery of the lower plastic body 21, and the other end extends toward the central axis of the lower plastic body 21. Along the radial direction of the lower plastic 20, the second side wall surface 222 is located on the side of the first side wall surface 221 close to the central axis of the lower plastic body 21. One end of the second side wall surface 222 is connected to the periphery of the lower plastic body 21, and the other end extends toward the central axis of the lower plastic body 21. In this embodiment, the second side wall surface 222 is arc-shaped. The second side wall surface 222 extends along the circumferential direction of the lower plastic body 21. Along the thickness direction of the lower plastic 20, the end surface 223 is the surface of the limiting protrusion 22 facing away from the lower plastic body 21. The end surface 223 is connected between the first side wall surface 221 and the second side wall surface 222.

[0056] In other embodiments, the second side wall surface 222 may also be straight or wavy. The present application does not impose any specific limitation on the shape of the second side wall surface 222 .

[0057] The limiting protrusion 22 is provided with a guide groove 224. Along the thickness direction of the lower plastic 20, the guide groove 224 penetrates the first surface 211 of the lower plastic body 21 and the end surface 223 of the limiting protrusion 22. The guide groove 224 forms a first opening and a second opening on the first surface 211 and the end surface 223, respectively. The guide groove 224 is used to allow electrolyte to flow.

[0058] Along the width direction of the guide groove 224, the guide groove 224 includes two groove side walls arranged opposite to each other. It can be understood that the two groove side walls of the guide groove 224 are both part of the limiting protrusion 22. The guide groove 224 includes two groove side walls arranged opposite to each other. In this embodiment, the two groove side walls arranged opposite to each other of the guide groove 224 are both inclined, and the inclination direction of the two groove side walls is the same as the inclination direction of the first side wall surface 221.

[0059] In other embodiments, two oppositely disposed groove side walls of the guide groove 224 may also extend along the thickness direction of the lower plastic 20 .

[0060] A plurality of reinforcing ribs 225 are provided in the guide groove 224. The plurality of reinforcing ribs 225 are connected to two oppositely disposed groove side walls of the guide groove 224. The plurality of reinforcing ribs 225 are arranged at intervals along the length direction of the guide groove 224. The plurality of reinforcing ribs 225 divide the guide groove 224 into a plurality of sub-guide grooves. Two adjacent sub-guide grooves are separated by a reinforcing rib 225.

[0061] In this embodiment, there are two limiting protrusions 22 . Along the radial direction of the lower plastic 20 , the two limiting protrusions 22 are spaced apart and opposite to each other. The two limiting protrusions 22 are symmetrically arranged about the central axis of the lower plastic body 21 .

[0062] It can be understood that the first side wall surface 221 and the second side wall surface 222 of the limiting protrusion 22 are both inclined, so that the two oppositely arranged groove side walls of the guide groove 224 can be inclined, and the inclination direction of the two groove side walls is the same as the inclination direction of the first side wall surface 221 and the second side wall surface 222. The first opening and the second opening formed by the guide groove 224 on the first surface 211 and the end surface 223 can both have a large width. Therefore, it can be ensured that after the electrolyte enters the guide groove 224 through the first opening, it can quickly flow out from the second opening; avoid the electrolyte from staying on the first surface 211 of the lower plastic body 21, which reduces the use efficiency of the electrolyte.

[0063] By setting a plurality of reinforcing ribs 225 between two oppositely arranged groove side walls of the guide groove 224, the overall structural strength of the limiting protrusion 22 can be strengthened and the service life of the lower plastic 20 can be improved; thereby preventing the limiting protrusion 22 from being weakened in structural strength due to the opening of the guide groove 224, thereby preventing the limiting protrusion 22 from being easily damaged.

[0064] Please continue reading Figure 4 In this embodiment, a second clamping portion 215 is formed on the first surface 211 of the lower plastic body 20. Specifically, the second clamping portion 215 is a protrusion. Along the thickness direction of the end cover 10, the second clamping portion 215 is convexly arranged on the first surface 211 of the lower plastic body 21. The second clamping portion 215 is used to be clamped and connected with the end cover 10. The number of the second clamping portions 215 is two.

[0065] In other embodiments, when the first clamping portion 15 is a protrusion, the second clamping portion 215 is a corresponding groove; along the thickness direction of the lower plastic 20, the second clamping portion 215 is recessed in the first surface 211. The second clamping portion 215 can also be one, three, four or other numbers.

[0066] The lower plastic body 21 is also provided with an explosion-proof hole 214. Along the radial direction of the lower plastic 20, the explosion-proof hole 214 is located between the two limiting protrusions 22 and is spaced apart from the pole through hole 213. Along the thickness direction of the lower plastic 20, the explosion-proof hole 214 penetrates the first surface 211 and the second surface 212.

[0067] In this embodiment, the lower plastic 20 further includes an explosion-proof net 23 . The explosion-proof net 23 is installed on the hole wall of the explosion-proof hole 214 .

[0068] Please continue reading Figure 3 and Figure 4In this embodiment, the current collecting disk 60 includes a disk body 61 and a connecting portion 62. The disk body 61 is a circular disk. The disk body 61 includes a first side surface 611, a second side surface 612 and a peripheral side surface. Along the thickness direction of the current collecting disk 60, the first side surface 611 and the second side surface 612 are arranged back to back; the peripheral side surface is connected between the first side surface 611 and the second side surface 612. The diameter of the disk body 61 is smaller than the diameter of the electrode assembly 300. The diameter of the disk body 61 is smaller than the diameter of the lower plastic body 21. The diameter of the disk body 61 is larger than the diameter of the circumscribed circle of the end faces 223 of the two limiting protrusions 22.

[0069] The disc body 61 is provided with a first welding groove 615 and a second welding groove 616. Along the radial direction of the disc body 61, the first welding groove 615 and the second welding groove 616 are spaced apart and opposite to each other.

[0070] Along the thickness direction of the disk body 61, the first welding groove 615 is concavely arranged from the first side surface 611 to the second side surface 612, and is convexly arranged on the second side surface 612 to form a first welding protrusion 617. Along the radial direction of the disk body 61, the first welding groove 615 penetrates the peripheral side surface. In this embodiment, the first welding groove 615 is in a broken line shape. Both opposite ends of the first welding groove 615 penetrate the peripheral side surface. In other embodiments, the first welding groove 615 can also be in other shapes such as an arc. The first welding groove 615 can also have only one end penetrating the peripheral side surface. For example, the first welding groove 615 is in a straight line shape.

[0071] Along the thickness direction of the disk body 61, the second welding groove 616 is recessed from the first side surface 611 to the second side surface 612, and is convexly provided on the second side surface 612 to form a second welding protrusion 618. Along the radial direction of the disk body 61, the second welding groove 616 penetrates the peripheral side surface. In this embodiment, the second welding groove 616 is in a broken line shape. Both opposite ends of the second welding groove 616 penetrate the peripheral side surface. In other embodiments, the second welding groove 616 may also be in other shapes such as an arc. The second welding groove 616 may also have only one end penetrating the peripheral side surface. For example, the second welding groove 616 is in a straight line shape.

[0072] The disc body 61 is also provided with a plurality of air holes 614. Along the thickness direction of the current collecting disc 60, the plurality of air holes 614 penetrate the first side surface 611 and the second side surface 612. The plurality of air holes 614 are spaced apart from the first welding groove 615 and the second welding groove 616.

[0073] The connecting portion 62 is a roughly rectangular sheet. One end of the connecting portion 62 in the length direction is connected to the first side surface 611 of the disk body 61, and the other end extends in a direction away from the disk body 61. The connecting portion 62 is staggered with the first welding groove 615, the second welding groove 616 and the plurality of air holes 614 of the disk body 61. In other words, the connecting portion 62 does not block the first welding groove 615, the second welding groove 616 and the plurality of air holes 614. The connecting portion 62 is parallel to the disk body 61 (a certain dimensional tolerance is allowed). The connecting portion 62 can be folded relative to the disk body 61.

[0074] In other embodiments, one end of the connecting portion 62 in the length direction may also be connected to the peripheral side surface of the disk body 61 .

[0075] See also Figure 5 , Figure 5 for Figure 1 A cross-sectional schematic diagram of a partial structure of the energy storage device 1000 shown. In this embodiment, the lower plastic 20 is stacked on the mounting surface 12 of the end cover 10. Specifically, the first surface 211 of the lower plastic body 21 abuts against the mounting surface 12 of the end cover 10. The second clamping portion 215 of the lower plastic 20 is clamped with the first clamping portion 15 of the end cover 10. The pole hole 13 of the end cover 10 is coaxially arranged with the pole through hole 213 of the lower plastic 20. Along the thickness direction of the end cover assembly 100 (Z-axis direction), the through groove 14 of the end cover 10 is opposite to and connected to the explosion-proof hole 214. The flange 31 of the pole 30 is crimped to the second surface 212 of the lower plastic body 21, and the column 32 is penetrated through the pole through hole 213 of the lower plastic 20 and the pole hole 13 of the end cover 10.

[0076] It can be understood that by providing the first clamping portion 15 on the end cover 10 and the second clamping portion 215 on the lower plastic 20, when the lower plastic 20 is stacked on the end cover 10, the first clamping portion 15 and the second clamping portion 215 are clamped, thereby improving the assembly stability of the lower plastic 20 and the end cover 10 and preventing the lower plastic 20 from moving relative to the end cover 10.

[0077] The connection portion 62 of the current collecting disk 60 is folded relative to the disk body 61. The connection portion 62 is stacked on the disk body 61. The connection portion 62 is limited between the two limiting protrusions 22 of the lower plastic 20. Along the height direction (Z-axis direction) of the energy storage device 1000, the connection portion 62 is located on the side of the flange 31 of the pole 30 facing away from the lower plastic body 21. The connection portion 62 is electrically connected to the pole 30. Along the thickness direction (Z-axis direction) of the energy storage device 1000, the disk body 61 of the current collecting disk 60 is located on the side of the two limiting protrusions 22 facing away from the lower plastic body 21. The orthographic projection of the disk body 61 on the second surface 212 of the lower plastic body 21 is located in the lower plastic body 21. The disk body 61 is spaced and opposite to the two limiting protrusions 22. The end faces 223 of the two limiting protrusions 22 are both opposite to the first side 611 of the disk body 61. The orthographic projections of the end faces 223 of the two limiting protrusions 22 on the second surface 212 of the lower plastic body 21 are located within the orthographic projection of the disc body 61 on the second surface 212 of the lower plastic body 21. One guide groove 224 is opposite to and connected with the first welding groove 615, and the other guide groove 224 is opposite to and connected with the second welding groove 616. Specifically, the sub-guide grooves at both ends of one limiting protrusion 22 are opposite to and connected with the opposite ends of the first welding groove 615, respectively; the sub-guide grooves at both ends of the other limiting protrusion 22 are opposite to and connected with the opposite ends of the second welding groove 616, respectively.

[0078] In other embodiments, other sub-guiding grooves in one limiting protrusion 22 may be opposite to and connected with the first welding groove 615; other sub-guiding grooves in another limiting protrusion 22 may be opposite to and connected with the second welding groove 616. For example, the first welding groove 615 is linear, and the first welding groove 615 extends in the radial direction of the disc body 61; the middle sub-guiding groove in one limiting protrusion 22 is opposite to and connected with the first welding groove 615. The second welding groove 616 is linear, and the second welding groove 616 extends in the radial direction of the disc body 61; the middle sub-guiding groove in another limiting protrusion 22 is opposite to and connected with the second welding groove 616.

[0079] In this embodiment, the winding core 310 is accommodated in the accommodating cavity of the shell 400. The pole ear 320 is located on the side of the winding core 310 facing the opening. The end cap assembly 100 is sealed to the opening of the shell 400. Specifically, the end cap 10 is installed at the opening of the shell 400. The periphery of the end cap 10 is connected to the edge of the opening of the shell 400. The lower plastic 20 is located in the accommodating cavity. Along the radial direction of the energy storage device 1000, the two limiting protrusions 22 are spaced from the cavity wall of the accommodating cavity of the shell 400. Along the height direction of the energy storage device 1000 (Z-axis direction), the current collecting plate 60 is located between the electrode assembly 300 and the lower plastic 20. The disc body 61 of the current collecting plate 60 is stacked on the pole ear 320 of the electrode assembly 300. The first welding protrusion 617 and the second welding protrusion 618 of the disc body 61 are both welded to the pole ear 320 of the electrode assembly 300. Along the height direction (Z-axis direction) of the energy storage device 1000 , the orthographic projection of the disk body 61 of the current collecting disk 60 on the electrode assembly 300 is located inside the electrode assembly 300 .

[0080] It can be understood that in the present application, the two limiting protrusions 22 are arranged obliquely, the disc body 61 of the current collecting disc 60 is located on the side of the two limiting protrusions 22 facing away from the lower plastic body 21, the disc body 61 is spaced and opposite to the two limiting protrusions 22, and along the height direction (Z-axis direction) of the energy storage device 1000, the orthographic projection of the end faces 223 of the two limiting protrusions 22 on the second surface 212 is located within the orthographic projection of the disc body 61 on the second surface 212. A guide groove 224 is formed in both limiting protrusions 22, and the guide groove 224 runs through the first surface 211 and the end face 223. The guide groove 224 forms a first opening and a second opening on the first surface 211 and the end face 223, respectively. When the energy storage device 1000 is inverted, the disc body 61 of the current collecting disc 60 can shield the flow guide groove 224, reducing the electrolyte from passing through the flow guide groove 224 to reach the gap between the lower plastic 20 and the end cover 10, thereby wasting the electrolyte. Therefore, the present application can improve the utilization rate of the electrolyte.

[0081] When the electrolyte flows to the gap between the lower plastic body 21 and the end cover 10 due to the shaking of the energy storage device 1000, the electrolyte can flow back to the disc body 61 of the current collecting disc 60 through the guide groove 224. The current collecting disc 60 is provided with a plurality of vent holes 614, and the electrolyte can flow to the tab 320 through the plurality of vent holes 614, and flow from the tab 320 to the winding core 310. Therefore, the utilization rate of the electrolyte and the wettability of the electrode assembly 300 are improved. Along the height direction of the energy storage device 1000 (Z-axis direction), the disk body 61 of the current collecting disk 60 is projected on the electrode assembly 300, and the electrolyte falling on the disk body 61 can also flow from the edge of the disk body 61 into the winding core 310, preventing the electrolyte from flowing from the edge of the disk body 61 to the cavity wall between the electrode assembly 300 and the housing 400. The insulating film on the periphery of the winding core 310 blocks the electrolyte from entering the winding core 310, causing electrolyte waste. Therefore, the wettability of the electrode assembly 300 can be improved, and the utilization rate of the electrolyte can be improved.

[0082] In addition, along the height direction (Z-axis direction) of the energy storage device 1000, the end faces 223 of the two limiting protrusions 22 are opposite to the first side surface 611 of the disk body 61, one guide groove 224 is opposite to and connected with the first welding groove 615, and the other guide groove 224 is opposite to and connected with the second welding groove 616, so that the electrolyte flowing out of one guide groove 224 can also fall into the first welding groove 615, and flow from the first welding groove 615 through the edge of the disk body 61 into the electrode assembly 300. The electrolyte flowing out of the other guide groove 224 can also fall into the second welding groove 616, and flow from the second welding groove 616 through the edge of the disk body 61 into the electrode assembly 300. Therefore, the speed at which the electrolyte flows into the electrode assembly 300 can be accelerated.

[0083] In addition, in the present application, a limiting protrusion 22 is provided on the lower plastic 20, and when the lower plastic 20 is installed in the shell 400, the limiting protrusion 22 is limited inside the shell 400, so that the limiting protrusion 22 can limit the lower plastic 20, thereby improving the stability of the lower plastic 20 installed in the shell 400, and preventing the lower plastic 20 from moving relative to the shell 400 along the radial direction of the energy storage device 1000.

[0084] Along the radial direction of the energy storage device 1000, the two limiting protrusions 22 are inclined to ensure the assembly effect of the lower plastic 20 and the shell 400, and avoid the limiting protrusions 22 and the shell 400 from scratching or interfering when the lower plastic 20 is installed on the shell 400, thereby avoiding abnormal assembly of the lower plastic 20 and the shell 400; or local damage to the lower plastic 20 or the shell 400, affecting the normal use of the lower plastic 20 or the shell 400. In addition, the orthographic projection of the disc body 61 of the current collecting disc 60 on the second surface 212 is located in the lower plastic body 21. When the end cover assembly 100 is assembled on the shell 400, the structural integrity of the disc body 61 can also be ensured to avoid interference between the disc body 61 and the shell 400, which causes damage to the disc body 61.

[0085] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An end cap assembly, characterized in that: Including end cap, lower plastic, pole and collector plate; The lower plastic comprises a lower plastic body and a limiting convex portion, the end cover and the lower plastic body are stacked along the thickness direction of the end cover assembly, the lower plastic body comprises a first surface and a second surface arranged opposite to each other along the thickness direction of the end cover assembly, the first surface faces the end cover, and the second surface faces away from the end cover, and the pole is passed through the end cover and the lower plastic body; There are two limiting protrusions, both of which are convexly arranged on the second surface. Along the radial direction of the lower plastic, the two limiting protrusions are symmetrically arranged about the central axis of the lower plastic body; Each of the limiting protrusions includes a first side wall surface, a second side wall surface, and an end surface. Along the second surface toward the end surface, one end of the first side wall surface is connected to the periphery of the lower plastic body, and the other end of the first side wall surface extends toward the central axis of the lower plastic body. The second side wall surface is located on a side of the first side wall surface close to the center of the lower plastic body. Along the second surface toward the end surface, one end of the second side wall surface is connected to the second surface, and the other end of the second side wall surface extends toward the central axis of the lower plastic body. The end surface is connected between the first side wall surface and the second side wall surface. Each of the limiting protrusions is provided with a guide groove, and along the thickness direction of the end cover assembly, the guide groove runs through the first surface and the end surface; The current collecting plate includes a connecting portion and a plate body portion, one end of the connecting portion is connected to the pole, and the other end is connected to the plate body portion, along the thickness direction of the end cover assembly, the plate body portion is located on the side of the two limiting protrusions facing away from the lower plastic body, the orthographic projection of the plate body portion on the second surface is located in the lower plastic body, and the orthographic projections of the end surfaces of the two limiting protrusions on the second surface are both located at the orthographic projection of the plate body portion on the second surface.

2. The end cap assembly according to claim 1, characterized in that: The disk body portion includes a first side surface, a second side surface and a peripheral side surface. Along the thickness direction of the end cover assembly, the first side surface and the second side surface are arranged in opposite directions, and the peripheral side surface is connected between the first side surface and the second side surface; The disc body is provided with a first welding groove and a second welding groove, the first welding groove is formed by the first side surface being recessed toward the second side surface, and the first welding groove passes through the peripheral side surface, the second welding groove is formed by the first side surface being recessed toward the second side surface, and the second welding groove passes through the peripheral side surface, and along the radial direction of the end cover assembly, the first welding groove and the second welding groove are spaced and opposite to each other; Along the thickness direction of the end cover assembly, the end faces of the two limiting protrusions are opposite to the first side surface, one guide groove is opposite to and connected with the first welding groove, and the other guide groove is opposite to and connected with the second welding groove.

3. The end cap assembly according to claim 2, characterized in that: Each of the guide grooves is provided with a plurality of reinforcing ribs, each of the reinforcing ribs is connected to two oppositely arranged groove side walls of the guide groove, and along the length direction of the guide groove, the plurality of reinforcing ribs are arranged at intervals from each other, and the plurality of reinforcing ribs separate the guide groove into a plurality of sub-guide grooves.

4. The end cap assembly according to claim 3, characterized in that: The opposite ends of the first welding groove both penetrate the peripheral side surface, and along the circumferential direction of the end cover assembly, the opposite ends of the first welding groove are spaced apart; The opposite ends of the second welding groove both penetrate the peripheral side surface, and the opposite ends of the second welding groove are spaced apart along the circumferential direction of the end cover assembly; The sub-guiding grooves at both ends of one of the limiting protrusions are respectively opposite to and connected with the opposite ends of the first welding groove, and the sub-guiding grooves at both ends of the other limiting protrusion are respectively opposite to and connected with the opposite ends of the second welding groove.

5. The end cap assembly according to claim 4, characterized in that: The disk body also includes a plurality of air holes. Along the height direction of the end cover assembly, each of the air holes penetrates two surfaces of the disk body that are arranged in opposite directions.

6. The end cap assembly according to any one of claims 1 to 5, characterized in that: The two oppositely disposed groove side walls of each guide groove are both inclined, and the inclination direction of the two groove side walls is the same as the inclination direction of the first side wall surface.

7. The end cap assembly according to claim 6, characterized in that: The end cover comprises a mounting surface, the mounting surface is formed with a first clamping portion, and the first surface is formed with a second clamping portion; The first surface is in contact with the mounting surface, and the first clamping portion is clamped with the second clamping portion.

8. An energy storage device, characterized in that: It comprises a shell and an end cover assembly according to any one of claims 1 to 7, wherein the shell is provided with a receiving cavity and an opening, and along the height direction of the energy storage device, the opening is located at one end of the receiving cavity, and the opening is communicated with the receiving cavity; The end cover is mounted on the opening, the lower plastic is located in the accommodating cavity, and along the radial direction of the energy storage device, the two limiting protrusions are spaced apart from the cavity wall of the accommodating cavity.

9. The energy storage device according to claim 8, characterized in that: The energy storage device further includes an electrode assembly, wherein the electrode assembly includes a pole ear, and the pole ear is located at one end of the electrode assembly in a height direction; The electrode assembly is accommodated in the accommodating cavity, the pole ear faces the opening, and along the height direction of the energy storage device, the disk body is located between the electrode assembly and the lower plastic, the disk body is stacked on the pole ear, the disk body is electrically connected to the pole ear, the connecting portion is stacked on the side of the disk body facing away from the pole ear, and is limited between the two limiting protrusions, and along the height direction of the energy storage device, the disk body is located inside the electrode assembly in the positive projection of the electrode assembly.

10. An electrical device, characterized in that: It comprises an energy storage device as described in any one of claims 8 to 9, wherein the energy storage device is used to store electrical energy.

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