End cover assembly, energy storage device and electric equipment

Abstract

The invention discloses an end cover assembly, an energy storage device and electric equipment. The end cover assembly comprises an end cover, a first plastic part, a pole and a pressing ring, the end cover comprises a first surface and a second surface which are arranged oppositely, the end cover is provided with a first through hole, and the first through hole penetrates through the first surface and the second surface; the first plastic part is arranged in the first through hole in a penetrating manner, the first plastic part comprises a second through hole, and the second through hole penetrates through the first plastic part in the thickness direction of the first plastic part; the pole comprises a base body, a first extension body and a second extension body which are coaxially arranged, the first extension body is convexly arranged on the base body, the first extension body and the base body are arranged in the second through hole in a penetrating manner, the first extension body is a polygonal cylinder, the second extension body is convexly arranged on the surface, deviating from the base body, of the first extension body, and the second extension body extends out of the second through hole; the pressing ring is arranged on the periphery of the second extending body in a sleeving mode and connected with the first extending body. According to the invention, the torsion resistance of the pole can be improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to end cap assemblies, energy storage devices and electrical equipment. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, higher requirements are placed on their energy density, reliability, and cost. In existing technology, the terminals of rechargeable batteries are typically cylindrical. However, cylindrical terminals may twist during use, potentially damaging the internal structure of the battery and affecting its normal operation. Summary of the Invention

[0003] This application provides an end cap assembly, an energy storage device, and an electrical device that can improve the torsional resistance of the pole.

[0004] The first aspect of this application provides an end cap assembly, comprising:

[0005] An end cap, the end cap including a first surface and a second surface disposed opposite to each other, the end cap having a first through hole that penetrates the first surface and the second surface;

[0006] A first plastic part is disposed within the first through hole. The first plastic part includes a second through hole, which penetrates the first plastic part along its thickness direction.

[0007] An electrode post, comprising a base, a first extension, and a second extension coaxially arranged, the first extension protruding from the base and both passing through a second through hole, the first extension being a polygonal cylinder, and the second extension protruding from the surface of the first extension facing away from the base, the second extension extending out of the second through hole; and

[0008] A pressure ring is sleeved around the periphery of the second extension and connected to the first extension.

[0009] In one possible implementation, the outer diameters of the base, the first extension, and the second extension decrease sequentially, the second extension is a polygonal prism, and the cross-sectional shape of the second extension along the height direction of the pole post is the same as the cross-sectional shape of the first extension along the height direction of the pole post.

[0010] In one possible implementation, the base is a polygonal prism, the portion of the first plastic part protruding from the first surface of the end cap is the body of the first plastic part, the surface of the body away from the end cap is provided with a recess, the recess communicates with the second through hole, and the base is accommodated in the recess.

[0011] In one possible implementation, the surface of the substrate facing away from the first extension is the connecting surface of the substrate, and the connecting surface is provided with a limiting groove, which is used to engage with the assembly fixture when assembling the pole post.

[0012] In one possible implementation, the first extension further includes a plurality of first side surfaces, with two adjacent first side surfaces connected by a first fillet, the radius of which ranges from 0.5mm to 5.0mm.

[0013] In one possible implementation, the surfaces where the first extension body and the second extension body are connected are abutting surfaces, and each of the first side surfaces is connected to the abutting surface by a second rounded corner, the radius of which is in the range of 0.1mm-1.0mm.

[0014] In one possible implementation, the cross-sectional dimension of the first extension gradually decreases along the direction from the base to the second extension, and the angle between each of the first side surfaces and the central axis of the pole is in the range of 1°-3°.

[0015] In one possible implementation, the end cap assembly further includes a second plastic part and a sealing ring;

[0016] The second plastic part is connected to the second surface of the end cap. The second plastic part includes a third through hole, which penetrates the second plastic part along the thickness direction. A portion of the first plastic part is located in the third through hole.

[0017] The sealing ring is connected between the outer surface of the first plastic part and the wall of the third through hole.

[0018] In one possible implementation, the first plastic part includes the body and the protrusion. The body protrudes from a first surface of the end cap, and the protrusion protrudes from the surface of the body facing the end cap. The protrusion passes through the first through hole, and the protrusion of the first plastic part is a polygonal annular body.

[0019] A second aspect of this application provides an energy storage device, including a housing, an electrode assembly, and an end cap assembly as described above. The housing has an opening and a receiving cavity, the opening and the receiving cavity are in communication, the electrode assembly is received in the receiving cavity, the end cap assembly covers the opening, and the electrode assembly is electrically connected to the end cap assembly.

[0020] A third aspect of this application provides an electrical device including an energy storage device as described above, the energy storage device being used to store electrical energy.

[0021] The beneficial effects of this invention are as follows: By setting the first extension of the electrode post as a polygonal column, and correspondingly providing through holes for the first plastic part and the pressure ring to pass through the first extension, when the first extension of the electrode post is connected with the first plastic part and the pressure ring, the first extension is less likely to rotate relative to the first plastic part and the pressure ring, thus improving the torsional strength of the electrode post. This prevents the electrode post from rotating during use, which could affect the connection stability between the electrode post and the pressure ring, or the connection stability between the electrode post and the adapter plate, causing an interruption of the current path of the energy storage device and affecting its normal operation. Even after disconnecting the adapter plates of two adjacent energy storage devices, the electrode post still maintains high torsional resistance. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the energy storage device provided in the first embodiment of this application;

[0024] Figure 2 for Figure 1 The diagram shows the exploded structure of the energy storage device.

[0025] Figure 3 for Figure 2 An exploded view of the end cap assembly at the first angle;

[0026] Figure 4 for Figure 2 An exploded view of the end cap assembly at the second angle;

[0027] Figure 5 for Figure 3 A schematic diagram of the pole structure of the end cap assembly shown;

[0028] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the pole shown;

[0029] Figure 7 for Figure 3 A schematic diagram of the cross-sectional structure of the end cap assembly shown;

[0030] Figure 8This is a schematic diagram of the end cap assembly of the energy storage device provided in the second embodiment of this application;

[0031] Figure 9 for Figure 8 An exploded view of the end cap assembly at the first angle;

[0032] Figure 10 for Figure 9 An exploded view of the end cap assembly at the second angle;

[0033] Figure 11 for Figure 8 A schematic diagram of the pole structure of the end cap assembly shown;

[0034] Figure 12 for Figure 11 A schematic diagram of the cross-sectional structure of the pole shown;

[0035] Figure 13 for Figure 8 The diagram shows a cross-sectional view of the end cap assembly.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1000 - Energy storage device, 400 - Housing, 300 - Electrode assembly, 200 - Adapter piece, 100 - End cap assembly, 10 - End cap, 20 - First plastic part, 30 - Second plastic part, 40 - Sealing ring, 50 - Pressure ring, 60 - Electrode post, 70 - Explosion-proof valve, 11 - First surface, 12 - Second surface, 13 - First through hole, 21 - Body, 22 - Protrusion, 211 - First surface, 212 - Second surface, 23 - Second through hole, 31 - Third surface, 32 - Fourth surface, 33 - Third through hole, 34 - Explosion-proof fence, 41 - Sealing hole, 51 - Positive 52-Back side, 53-Fourth through hole, 61-Base, 63-First extension, 64-Second extension, 611-Protruding surface, 612-Connecting surface, 613-Peripheral side, 614-Positioning groove, 6131-Through surface, R0-Rounded corner, 631-Abutting surface, 632-First side, R1-First rounded corner, R2-Second rounded corner, 65-First sub-segment, 66-Second sub-segment, 651-Transition surface, 652-Second side, R3-Third rounded corner, 661-Transition surface, 662-Third side, R4-Fourth chamfer, 67-Limiting slot. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form according to future application needs. Currently, the generation of green electricity generally relies on photovoltaic, wind, and hydropower. However, wind and solar energy are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it, releasing it as electricity when needed. Simply put, energy storage is like a large "power bank," storing electrical energy when photovoltaic and wind power are abundant and releasing the stored electricity when needed.

[0040] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the energy storage device provided in the first embodiment of this application; Figure 2 for Figure 1 The diagram shows the exploded structure of the energy storage device.

[0041] This application provides an energy storage device 1000, which is equipped with a set of chemical batteries. It mainly uses the chemical elements in the chemical batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, it stores the electrical energy generated by wind and solar energy in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use or transferred to places with a shortage of electricity.

[0042] The energy storage device 1000 provided in this application has a wide range of applications, including energy storage on the (wind and solar) power generation side, grid-side energy storage, base station-side energy storage, and user-side energy storage. The energy storage device 1000 is typically used in the form of energy storage containers, small and medium-sized energy storage cabinets, and small residential energy storage boxes, etc., and these devices contain the energy storage device 1000.

[0043] It should be noted that the aforementioned energy storage containers, small and medium-sized energy storage cabinets, and household small energy storage boxes, which contain energy storage devices 1000, can be understood as electrical equipment.

[0044] The number of energy storage devices 1000 can be several, and the several energy storage devices 1000 can be connected in series or in parallel. In this embodiment, "several" means two or more.

[0045] In this application, "conduction" refers to electrical connection. Two conductive components conducting electricity is equivalent to being electrically connected. The structural connection methods of two conductive components include, but are not limited to, welding the two conductive components together, or the surfaces of the two conductive components abutting each other.

[0046] 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, and energy storage clusters. The actual application form of the energy storage device 1000 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 1000. This application embodiment only uses an energy storage battery as an example for illustration.

[0047] Please continue reading Figure 2 The energy storage device 1000 includes a housing 400, an electrode assembly 300, an adapter plate 200, and an end cap assembly 100. The housing 400 has an opening and a receiving cavity. The electrode assembly 300 is received within the receiving cavity, and the housing 400 surrounds the electrode assembly 300 and its bottom. The end cap assembly 100 covers the opening, and the housing 400 and the end cap assembly 100 are sealed together. The adapter plate 200 is located between the electrode assembly 300 and the end cap assembly 100, and electrically connects the electrode assembly 300 and the end cap assembly 100.

[0048] Please refer to the following: Figure 3 and Figure 4 , Figure 3 for Figure 2 An exploded view of the end cap assembly at the first angle; Figure 4 for Figure 2 The diagram shows an exploded view of the end cap assembly from a second angle.

[0049] For ease of description, define Figure 3 The length direction of the end cap assembly 100 shown is the X-axis direction, the width direction is the Y-axis direction, and the thickness direction is the Z-axis direction. The X-axis, Y-axis, and Z-axis directions are mutually perpendicular. The directional terms such as "upper" and "lower" mentioned in the description of the embodiments in this application are based on the appendix to the specification. Figure 2 The orientation described herein, with "up" referring to the positive Z-axis direction and "down" referring to the negative Z-axis direction, does not constitute a limitation on the energy storage device 1000 in actual application scenarios. The terms "same," "equal," or "parallel" used below are all subject to tolerance.

[0050] The end cap assembly 100 includes an end cap 10, a first plastic part 20, a second plastic part 30, a sealing ring 40, and a pressure ring 50. Along the thickness direction (Z-axis direction) of the end cap assembly 100, the first plastic part 20, the end cap 10, the second plastic part 30, the sealing ring 40, and the pressure ring 50 are stacked sequentially. The first plastic part 20, the second plastic part 30, the sealing ring 40, and the pressure ring 50 are all coaxially arranged. The end cap assembly 100 also includes a pole post 60. The pole post 60 passes through the first plastic part 20 and the pressure ring 50. In this embodiment, the end cap 10 is made of plain aluminum. The first plastic part 20 is made of plastic and is insulating. The second plastic part 30 is made of plastic and is insulating. The end cap assembly 100 also includes an explosion-proof valve 70, which is mounted on the end cap 10.

[0051] It should be noted that, in order to facilitate the assembly of the end cap assembly 100 and the production of its various components, the shapes of the through holes and the components passing through them remain consistent. For example, when the pole post 60 is a hexagonal prism, the through hole for the pole post 60 is also a hexagonal through hole. The pole post 60 can be either a positive or negative pole post. This application does not impose specific limitations in this regard.

[0052] The end cap 10 is a rectangular plate. The end cap 10 includes a first surface 11 and a second surface 12, which are arranged opposite to each other along the thickness direction of the end cap 10. The end cap 10 has a first through hole 13. The first through hole 13 is a polygonal through hole. Along the thickness direction of the end cap 10, the first through hole 13 penetrates the first surface 11 and the second surface 12. The first through hole 13 is located at one end of the end cap 10 along its length. In this embodiment, the first through hole 13 is a hexagonal through hole. In other embodiments, the first through hole 13 can also be a quadrilateral, octagonal, or other polygonal through hole.

[0053] The first plastic part 20 includes a body 21 and a protrusion 22. The body 21 is a polygonal annular body with an approximately L-shaped cross-section. The body 21 includes a first surface 211 and a second surface 212, which are arranged opposite to each other along the thickness direction of the body 21. The first surface 211 is a stepped surface, which can be understood as having an annular recess formed on the first surface 211. The second surface 212 is an annular surface. The protrusion 22 is a polygonal annular body. Along the thickness direction of the first plastic part 20, the protrusion 22 protrudes from the inner periphery of the second surface 212. The protrusion 22 is coaxially arranged with the body 21. The body 21 and the protrusion 22 together form a second through hole 23. The second through hole 23 is a polygonal through hole. It can be understood that the first plastic part 20 includes the second through hole 23. The second through hole 23 penetrates the first plastic part 20 along the thickness direction. The second through hole 23 communicates with the recess. In this embodiment, the body 21 is a hexagonal ring. The protrusion 22 is a hexagonal ring. The second through hole 23 is a hexagonal through hole. In other embodiments, the body 21 can also be a ring of other polygons such as quadrilaterals or octagons. The protrusion 22 can also be a ring of other polygons such as quadrilaterals or octagons. The second through hole 23 can also be a through hole of other polygons such as quadrilaterals or octagons.

[0054] The second plastic part 30 is a rectangular plate. The second plastic part 30 includes a third surface 31 and a fourth surface 32, which are arranged facing away from each other along the thickness direction of the second plastic part 30. The second plastic part 30 has a third through hole 33. The third through hole 33 is a polygonal through hole. Along the thickness direction of the second plastic part 30, the third through hole 33 penetrates the third surface 31 and the fourth surface 32. The third through hole 33 is located at one end of the second plastic part 30 along its length. The second plastic part 30 has an explosion-proof hole. Along the thickness direction of the second plastic part 30, the explosion-proof hole penetrates the third surface 31 and the fourth surface 32. The explosion-proof hole is located in the middle of the second plastic part 30. An explosion-proof barrier 34 is provided inside the explosion-proof hole. In this embodiment, the third through hole 33 is a hexagonal through hole. In other embodiments, the third through hole 33 can also be a quadrilateral, octagonal, or other polygonal through hole.

[0055] The sealing ring 40 is made of an elastic insulating material. The sealing ring 40 is a polygonal annular body. The sealing ring 40 has a sealing hole 41. The sealing hole 41 penetrates the surface of the sealing ring 40 facing away from it along its thickness direction. The sealing hole 41 is a polygonal through hole. In this embodiment, the sealing ring 40 is a hexagonal annular body. The sealing hole 41 is a hexagonal through hole. In other embodiments, the sealing ring 40 may also be a quadrilateral, octagonal, or other polygonal annular body. The sealing hole 41 may also be a quadrilateral, octagonal, or other polygonal through hole.

[0056] The pressure ring 50 is a polygonal annular body. The pressure ring 50 includes a front side 51 and a back side 52, which are arranged opposite to each other along the thickness direction of the pressure ring 50. The pressure ring 50 also includes a fourth through hole 53. The fourth through hole 53 is a polygonal through hole. Along the thickness direction of the pressure ring 50, the fourth through hole 53 penetrates through the front side 51 and the back side 52. In this embodiment, the pressure ring 50 is a hexagonal annular body. The fourth through hole 53 is a hexagonal through hole. In other embodiments, the pressure ring 50 can also be a quadrilateral, octagonal, or other polygonal annular body. The fourth through hole 53 can also be a quadrilateral, octagonal, or other polygonal through hole.

[0057] Please refer to the following: Figure 5 and Figure 6 , Figure 5 for Figure 3 A schematic diagram of the pole structure of the end cap assembly shown; Figure 6 for Figure 5 The diagram shows the cross-sectional structure of the pole.

[0058] The pole post 60 includes a base 61, a first extension 63, and a second extension 64. The base 61, the first extension 63, and the second extension 64 are coaxially arranged. The outer diameters of the base 61, the first extension 63, and the second extension 64 decrease sequentially. The cross-sectional shape of the second extension 64 along the height direction of the pole post 60 is the same as the cross-sectional shape of the first extension 63 along the height direction of the pole post 60.

[0059] It should be noted that the term "same shape" in this application refers only to the shape of the area enclosed by the outer contours being the same, and does not strictly require that the size of the area enclosed by the outer contours be the same. For example, when the cross-sectional shape of the first extension 63 along the height direction of the pole post 60 is hexagonal, the cross-sectional shape of the second extension 64 along the height direction of the pole post 60 is also hexagonal. The area of ​​the cross-sectional shape of the first extension 63 along the height direction of the pole post 60 and the cross-sectional shape of the second extension 64 along the height direction of the pole post 60 are different.

[0060] The base 61 is a polygonal prism. The base 61 includes a protruding surface 611, a connecting surface 612, and a peripheral surface 613. Along the height direction of the pole post 60, the protruding surface 611 and the connecting surface 612 are arranged facing away from each other; the peripheral surface 613 connects the protruding surface 611 and the connecting surface 612. The peripheral surface 613 is the outermost surface of the base 61 surrounding the central axis of the pole post 60. The peripheral surface 613 includes a plurality of through surfaces 6131 connected end-to-end. In this embodiment, two adjacent through surfaces 6131 are connected by a fillet R0.

[0061] The substrate 61 is provided with a positioning groove 614. The positioning groove 614 is recessed into the connecting surface 612 of the substrate 61. The positioning groove 614 is used to position the end cap assembly 100 by identifying its position when assembling the end cap assembly 100 and the electrode assembly 300. In this embodiment, the central axis of the positioning groove 614 coincides with the central axis of the electrode post 60. In other embodiments, the central axis of the positioning groove 614 may be offset from the central axis of the electrode post 60. Alternatively, the positioning groove 614 may not be provided.

[0062] Understandably, by connecting two adjacent through surfaces 6131 of the substrate 61 through a fillet R0, wear on the mold can be reduced, material flow can be facilitated, and the process yield of the pole piece 60 can be improved. In addition, the material flow resistance during the stamping process of the pole piece 60 can be reduced, and the surface of the pole piece 60 is less likely to crack.

[0063] The first extension 63 is a polygonal prism. The first extension 63 protrudes from the protruding surface 611 of the base 61 and extends away from the protruding surface 611. An angle is formed between the first extension 63 and the protruding surface 611. The first extension 63 includes an abutment surface 631 and a plurality of first side surfaces 632. Along the height direction of the pole post 60, the abutment surface 631 is the surface of the first extension 63 facing away from the base 61. The plurality of first side surfaces 632 are connected between the abutment surface 631 and the protruding surface 611. The plurality of first side surfaces 632 are connected end-to-end. Adjacent first side surfaces 632 are connected by a first fillet R1. The radius of the first fillet R1 ranges from 0.5mm to 5.0mm (inclusive). Preferably, the radius of the first fillet R1 ranges from 1.5mm to 2.5mm (inclusive). Each first side surface 632 is connected to the abutment surface 631 by a second fillet R2. The radius of the second fillet R2 ranges from 0.1mm to 1.0mm (inclusive of endpoints). Preferably, the radius of the second fillet R2 ranges from 0.25mm to 0.50mm (inclusive of endpoints). In this embodiment, the first extension 63 is a hexagonal prism. In other embodiments, the first extension 63 can also be a quadrilateral, octagon, or other polygonal prism.

[0064] Understandably, by connecting two adjacent first side surfaces 632 of the first extension 63 with a first fillet R1, wear on the mold can be reduced, material flow can be facilitated, and the process yield of the pole piece 60 can be improved. In addition, the material flow resistance during the stamping process of the pole piece 60 can be reduced, and the surface of the pole piece 60 is less prone to cracking. By connecting each first side surface 632 to the abutment surface 631 with a second fillet R2, the process difficulty of the pole piece 60 can be reduced, and material flow during the process of the pole piece 60 can be facilitated.

[0065] The second extension 64 includes a first segment 65 and a second segment 66. The first segment 65 protrudes from the abutment surface 631 and extends away from the abutment surface 631. An angle is formed between the first segment 65 and the abutment surface 631. The first segment 65 includes an outer peripheral surface. The outer peripheral surface of the first segment 65 is the outermost surface of the first segment 65 surrounding the central axis of the pole post 60. Along the height direction of the pole post 60, the second segment 66 is connected to the end of the first segment 65 away from the first extension 63. The central axis of the second segment 66 coincides with the central axis of the first segment 65. In this embodiment, the diameter of the second segment 66 is smaller than the diameter of the first segment 65. In other embodiments, the diameters of the first segment 65 and the second segment 66 may also be the same (allowing for certain manufacturing tolerances).

[0066] In this embodiment, both the first segment 65 and the second segment 66 are hexagonal prisms. The first segment 65 includes a transition surface 651 and multiple second side surfaces 652. Along the height direction of the pole post 60, the transition surface 651 is the surface of the first segment 65 facing away from the first extension body 63. The multiple second side surfaces 652 are connected between the abutment surface 631 and the transition surface 651. The multiple second side surfaces 652 are connected end to end. Adjacent two second side surfaces 652 are connected by a third fillet R3.

[0067] The second segment 66 protrudes from the transition surface 651 of the first segment 65 and extends away from the transition surface 651. The second segment 66 and the transition surface 651 form an angle. The second segment 66 includes a transition surface 661 and a plurality of third side surfaces 662. Along the height direction of the pole post 60, the transition surface 661 is the surface of the second segment 66 facing away from the first segment 65. The transition surface 661 is used for welding to the adapter piece 200. The plurality of third side surfaces 662 are connected between the transition surface 661 and the transition surface 651. The plurality of third side surfaces 662 are connected end-to-end. Adjacent third side surfaces 662 are connected by a fourth chamfer R4. In other embodiments, the first segment 65 and the second segment 66 may also be prisms of other polygonal shapes such as quadrilaterals, octagons, etc.

[0068] It is understandable that by providing a third fillet R3 at the connection between two adjacent second sides 652 and a fourth chamfer R4 at the connection between two adjacent third sides 662, wear on the mold can be reduced, material flow can be facilitated, and the process yield of the pole post 60 can be improved. In addition, the material flow resistance during the stamping process of the pole post 60 can be reduced, and the surface of the pole post 60 is less likely to crack.

[0069] In this embodiment, the cross-sectional dimension of the first extension 63 gradually decreases along the direction from the base 61 to the second extension 64. It can be understood that each first side surface 632 is inclined towards the central axis O of the pole post 60. The angle between each first side surface 632 and the central axis O of the pole post 60 ranges from 1° to 3° (inclusive). Preferably, the angle between each first side surface 632 and the central axis O of the pole post 60 ranges from 0.05° to 5° (inclusive).

[0070] Understandably, each first side 632 is inclined toward the central axis of the pole post 60, which can reduce wear on the mold during the manufacturing process of the pole post 60, while also facilitating material flow and improving the process yield of the pole post 60; in addition, it can also reduce the material flow resistance during the stamping process of the pole post 60, making the pole post 60 less prone to surface cracking.

[0071] It should be noted that when the electrode post 60 is a positive electrode post, the base 61, the first extension 63, and the second extension 64 of the electrode post 60 are all made of aluminum. When the electrode post 60 is a negative electrode post, the second extension 64 of the electrode post 60 is made of copper; the base 61 and the first extension 63 can be made of either copper or aluminum.

[0072] Please refer to the following: Figure 3 , Figure 4 and Figure 7 , Figure 7 for Figure 3 The diagram shows a cross-sectional view of the end cap assembly.

[0073] In this embodiment, the second plastic component 30 is laminated on the second surface 12 of the end cap 10. Specifically, the third surface 31 of the second plastic component 30 is opposite to and adheres to the second surface 12 of the end cap 10. Along the thickness direction (Z-axis direction) of the end cap assembly 100, the third through hole 33 of the second plastic component 30 is opposite to and communicates with the first through hole 13 of the end cap 10.

[0074] The second surface 212 of the body 21 of the first plastic part 20 abuts against the first surface 11 of the end cap 10. The protrusion 22 of the first plastic part 20 passes through the first through hole 13 of the end cap 10 and the third through hole 33 of the second plastic part 30. It can be understood that the portion of the first plastic part 20 protruding relative to the first surface 11 of the end cap 10 is the body 21 of the first plastic part 20. The surface of the body 21 facing away from the end cap 10 has a recess. The second through hole 23 of the first plastic part 20 is coaxially arranged with the first through hole 13 of the end cap 10 and the third through hole 33 of the second plastic part 30. The annular outer periphery of the protrusion 22 abuts against the wall of the first through hole 13. The annular outer periphery of the protrusion 22 is spaced apart from the wall of the third through hole 33. An annular gap is formed between the annular outer periphery of the protrusion 22 and the wall of the third through hole 33. It can be understood that an annular gap is formed between the first plastic part 20 and the second plastic part 30.

[0075] The base 61 of the electrode post 60 is accommodated in the recess of the first plastic part 20. The protruding surface 611 of the base 61 abuts tightly against the first surface 211 of the first plastic part 20. The first extension 63 of the electrode post 60 passes through the second through hole 23 of the first plastic part 20, and multiple first side surfaces 632 of the first extension 63 abut against the wall of the second through hole 23. It should be noted that the first plastic part 20 is connected between the base 61, the first extension 63, and the end cap 10 of the electrode post 60, and the first plastic part 20 is used to insulate the electrode post 60 and the end cap 10.

[0076] A sealing ring 40 is fitted onto the protrusion 22 of the first plastic part 20. The sealing ring 40 is arranged in the annular gap between the first plastic part 20 and the second plastic part 30. That is, the sealing ring 40 is connected between the outer surface of the first plastic part 20 and the wall of the third through hole 33 of the second plastic part 30. The sealing ring 40 is pressed against the second surface 12 of the end cap 10.

[0077] A pressure ring 50 is fitted around the second extension 64 of the pole post 60. The front surface 51 of the pressure ring 50 abuts against the contact surface 631 of the first extension 63 of the pole post 60. The front surface 51 of the pressure ring 50 also abuts against the sealing ring 40. Specifically, the pressure ring 50 is fitted around the first segment 65 of the second extension 64 of the pole post 60. The wall of the fourth through hole 53 of the pressure ring 50 is welded to the outer peripheral surface of the first segment 65 of the second extension 64 of the pole post 60. Along the thickness direction (Z-axis direction) of the end cap assembly 100, the second segment 66 of the second extension 64 protrudes from the pressure ring 50. It should be noted that the sealing ring 40 abuts between the end cap 10 and the pressure ring 50. The sealing ring 40 is used to seal the pressure ring 50 and the end cap 10. The sealing ring 40 is also used to insulate the pressure ring 50 and the end cap 10.

[0078] Understandably, in this embodiment, by setting the first extension 63 of the pole post 60 to a hexagon (or other polygon), and correspondingly setting the second through hole 23 of the first plastic part 20 to a shape matching the first extension 63 of the pole post 60, the first extension 63 is less likely to rotate relative to the first plastic part 20 when it is connected to the first plastic part 20. This improves the torsional strength of the pole post 60 and prevents the pole post 60 from rotating during use, which could affect the connection stability between the pole post 60 and the pressure ring 50, or the connection stability between the pole post 60 and the adapter plate 200, thus interrupting the current path of the energy storage device 1000 and affecting its normal use. Even after disconnecting the tabs connecting two adjacent energy storage devices 1000, the pole post 60 still maintains high torsional strength.

[0079] Similarly, by setting the first segment 65 of the second extension 64 of the pole post 60 to a hexagon (or other polygon), the fourth through hole 53 of the pressure ring 50 is also set to a shape that matches the first segment 65 of the second extension 64 of the pole post 60, so that when the second extension 64 of the pole post 60 is connected to the pressure ring 50, the second extension 64 is not easy to rotate relative to the pressure ring 50, thus improving the torsional strength of the pole post 60.

[0080] By setting the protrusion 22 of the first plastic part 20 as a polygonal annular body, and correspondingly setting the first through hole 13 of the end cap 10 as a polygonal through hole, the first plastic part 20 is less likely to rotate relative to the end cap 10 when it passes through the first through hole 13 of the end cap 10. Simultaneously, the sealing ring 40 is also set as a polygonal annular body, and the third through hole 33 of the second plastic part 30 is set as a polygonal through hole. After the sealing ring 40 is installed in the annular gap between the first plastic part 20 and the second plastic part 30, rotation of the sealing ring 40 relative to the second plastic part 30 is also prevented. Therefore, the assembly stability of the end cap assembly 100 is improved.

[0081] Furthermore, in this embodiment, both the first extension 63 and the second extension 64 of the pole post 60 are hexagonal prisms, and the fourth through hole 53 of the pressure ring 50 is a hexagonal through hole. The abutting surface 631 of the first extension 63 abuts against the front surface 51 of the pressure ring 50. Compared to the second extension 64 being a cylinder, the fourth through hole 53 of the pressure ring 50 is a circular through hole. The welding area between the abutting surface 631 of the first extension 63 and the front surface 51 of the pressure ring 50 is an annular area with a hexagonal outer ring and a circular inner ring. In this embodiment, both the welding area between the second extension 64 of the pole post 60 and the adapter piece 200 and the abutting area between the abutting surface 631 of the first extension 63 and the front surface 51 of the pressure ring 50 are ensured, improving the uniformity of the supporting force of the pressure ring 50 on the first extension 63 and further increasing the assembly stability of the pole post 60.

[0082] When the end cap assembly 100 is assembled using the assembly fixture, the fixture fixes the periphery of the base 61 of the pole post 60, and the first extension 63 and the second extension 64 of the pole post 60 pass through the first plastic part 20 and the pressure ring 50. Compared to a cylindrical base 61 of the pole post 60, in this embodiment, the base 61 of the pole post 60 is a hexagonal prism. The base 61 of the pole post 60 will not rotate relative to the assembly fixture, thus ensuring that the pole post 60 is aligned with the first plastic part 20 and the pressure ring 50, improving the assembly efficiency of the end cap assembly 100, and avoiding the need for manual adjustment of the pole post 60's orientation to align it with the first plastic part 20 and the pressure ring 50.

[0083] Please refer to the following: Figure 8 , Figure 8 This is a schematic diagram of the end cap assembly of the energy storage device provided in the second embodiment of this application. The difference between the second embodiment and the first embodiment is that the base 61 of the pole post 60 is a circular plate. The base 61 of the pole post 60 is provided with a limiting groove 67. The body 21 of the first plastic part 20 is a circular ring.

[0084] Please refer to the following: Figure 9 and Figure 10 , Figure 9 for Figure 8 An exploded view of the end cap assembly at the first angle; Figure 10 for Figure 9 The diagram shows an exploded view of the end cap assembly from a second angle.

[0085] In this embodiment, the first plastic part 20 includes a body 21 and a protrusion 22. The body 21 is a circular annular body with an approximately L-shaped cross-section. The body 21 includes a first surface 211 and a second surface 212, which are arranged opposite to each other along the thickness direction of the body 21. The first surface 211 is a stepped surface, which can be understood as having an annular recess formed on the first surface 211. The second surface 212 is an annular surface. The protrusion 22 is a polygonal annular body. Along the thickness direction of the first plastic part 20, the protrusion 22 protrudes from the inner periphery of the second surface 212. The protrusion 22 is coaxially arranged with the body 21. The body 21 and the protrusion 22 together form a second through hole 23. The second through hole 23 is a polygonal through hole. It can be understood that the first plastic part 20 includes the second through hole 23. The second through hole 23 penetrates the first plastic part 20 along the thickness direction. The second through hole 23 communicates with the recess. In this embodiment, the protrusion 22 is a hexagonal ring. The second through hole 23 is a hexagonal through hole. In other embodiments, the protrusion 22 can also be a ring of other polygons such as quadrilaterals or octagons. The second through hole 23 can also be a through hole of other polygons such as quadrilaterals or octagons.

[0086] In this embodiment, the structures of the end cap 10, the second plastic part 30, the sealing ring 40, and the pressure ring 50 can all refer to the structures in the first embodiment described above, and will not be elaborated further here.

[0087] Please see Figure 11 and Figure 12 , Figure 11 for Figure 8 A schematic diagram of the pole structure of the end cap assembly shown; Figure 12 for Figure 11 The diagram shows the cross-sectional structure of the pole.

[0088] The substrate 61 includes a protruding surface 611, a connecting surface 612, and a peripheral surface 613. Along the height direction of the pole post 60, the protruding surface 611 and the connecting surface 612 are arranged facing away from each other; the peripheral surface 613 is connected between the protruding surface 611 and the connecting surface 612.

[0089] The substrate 61 is provided with a positioning groove 614. The positioning groove 614 is recessed into the connecting surface 612 of the substrate 61. The positioning groove 614 is used to position the end cap assembly 100 by identifying its position when assembling the end cap assembly 100 and the electrode assembly 300. In this embodiment, the central axis of the positioning groove 614 coincides with the central axis of the electrode post 60. In other embodiments, the central axis of the positioning groove 614 may be offset from the central axis of the electrode post 60. Alternatively, the positioning groove 614 may not be provided.

[0090] The base 61 is provided with at least one limiting groove 67. The limiting groove 67 is recessed in the connecting surface 612. In this embodiment, the limiting groove 67 penetrates the peripheral side surface 613. The limiting groove 67 and the positioning groove 614 are spaced apart. There are two limiting grooves 67. In other embodiments, the limiting groove 67 may not penetrate the peripheral side surface 613. For example, the limiting groove 67 is a groove in the shape of a square, triangle, trapezoid, etc. The number of limiting grooves 67 may also be three, four, or more. In one possible implementation, the groove wall of the limiting groove 67 is provided with multiple elastic protrusions to increase the frictional resistance when the pole post 60 is connected to the assembly fixture.

[0091] Please see Figure 13 , Figure 13 for Figure 8 The diagram shows a cross-sectional view of the end cap assembly. In this embodiment, the assembly structure of the pole post 60 with the first plastic part 20, the end cap 10, the second plastic part 30, the sealing ring 40, and the pressure ring 50 is the same as in the first embodiment described above, and will not be elaborated further here.

[0092] It is understood that in this embodiment, the peripheral side 613 of the base 61 of the pole post 60 is provided with a limiting groove 67. When the pole post 60 is assembled by the assembly fixture, the limiting groove 67 of the base 61 of the pole post 60 is used to engage with the assembly fixture to prevent the pole post 60 from rotating relative to the assembly fixture during the assembly process. Therefore, it can ensure that the pole post 60 is aligned with the second through hole 23 of the first plastic part 20 and the fourth through hole 53 of the pressure ring 50, thereby improving the assembly efficiency of the end cap assembly 100 and avoiding the need to manually adjust the direction of the pole post 60 to align the pole post 60 with the first plastic part 20 and the pressure ring 50.

[0093] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An end cap assembly, characterized in that, include: An end cap, the end cap including a first surface and a second surface disposed opposite to each other, the end cap having a first through hole that penetrates the first surface and the second surface; A first plastic part is disposed within the first through hole. The first plastic part includes a second through hole, which penetrates the first plastic part along its thickness direction. The pole includes a base, a first extension and a second extension arranged coaxially. The first extension protrudes from the base and both the first extension and the base pass through the second through hole. The first extension is a polygonal column. The second extension protrudes from the surface of the first extension away from the base and extends out of the second through hole. and A pressure ring is sleeved around the periphery of the second extension and connected to the first extension.

2. The end cap assembly according to claim 1, characterized in that, The outer diameters of the base, the first extension, and the second extension decrease sequentially. The second extension is a polygonal prism, and the cross-sectional shape of the second extension along the height direction of the pole post is the same as the cross-sectional shape of the first extension along the height direction of the pole post.

3. The end cap assembly according to claim 2, characterized in that, The base is a polygonal prism. The part of the first plastic part that protrudes from the first surface of the end cap is the body of the first plastic part. The surface of the body away from the end cap is provided with a recess. The recess communicates with the second through hole. The base is accommodated in the recess.

4. The end cap assembly according to claim 2, characterized in that, The surface of the base away from the first extension is the connecting surface of the base. The connecting surface is provided with a limiting groove, which is used to engage with the assembly fixture when assembling the pole post.

5. The end cap assembly according to claim 3 or 4, characterized in that, The first extension also includes a plurality of first side surfaces, with two adjacent first side surfaces connected by a first fillet, the radius of which ranges from 0.5mm to 5.0mm.

6. The end cap assembly according to claim 5, characterized in that, The surfaces where the first extension body and the second extension body are connected are abutting surfaces. Each of the first side surfaces is connected to the abutting surface by a second rounded corner, and the radius of the second rounded corner is in the range of 0.1mm-1.0mm.

7. The end cap assembly according to claim 6, characterized in that, The cross-sectional dimensions of the first extension gradually decrease along the direction from the base to the second extension, and the angle between each of the first side surfaces and the central axis of the pole is in the range of 1°-3°.

8. The end cap assembly according to claim 3 or 4, characterized in that, The end cap assembly also includes a second plastic part and a sealing ring; The second plastic part is connected to the second surface of the end cap. The second plastic part includes a third through hole, which penetrates the second plastic part along the thickness direction. A portion of the first plastic part is located in the third through hole. The sealing ring is connected between the outer surface of the first plastic part and the wall of the third through hole.

9. The end cap assembly according to claim 8, characterized in that, The first plastic part includes the body and the protrusion. The body protrudes from the first surface of the end cap, and the protrusion protrudes from the surface of the body facing the end cap. The protrusion passes through the first through hole, and the protrusion of the first plastic part is a polygonal annular body.

10. An energy storage device, characterized in that, The device includes a housing, an electrode assembly, and an end cap assembly as described in any one of claims 1-9, wherein the housing has an opening and a receiving cavity in communication with the opening and the receiving cavity, the electrode assembly is received within the receiving cavity, the end cap assembly covers the opening, and the electrode assembly is electrically connected to the end cap assembly.

11. An electrical appliance, characterized in that, Includes the energy storage device as described in claim 10, wherein the energy storage device is used to store electrical energy.

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