Pole assembly, end cover assembly, energy storage apparatus, and electric device

Abstract

The present application discloses a pole assembly, an end cover assembly, an energy storage apparatus, and an electric device. The pole assembly comprises a pole, a first insulating member, and a bottom plate. The first insulating member is provided with a positioning hole, and the positioning hole traverses the first insulating member in the thickness direction of the first insulating member. The bottom plate is located on one side of the first insulating member in the thickness direction, the bottom plate is provided with a fixing hole, and the fixing hole traverses the bottom plate in the thickness direction of the bottom plate and is in communication with the positioning hole. The pole comprises a column body portion and a flange portion, the flange portion is connected to one end of the column body portion, and a peripheral surface of the flange portion protrudes relative to a peripheral surface of the column body portion. The column body portion penetrates the positioning hole and the fixing hole, and the end, away from the flange portion, of the column body portion is fixedly connected to the bottom plate.

Description

Pole assembly, end cover assembly, energy storage device and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 12, 2023, with application number 202310688115.3 and application name “Pole assembly, end cover assembly, energy storage device and electrical equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of energy storage technology, and in particular to a pole assembly, an end cover assembly, an energy storage device, and electrical equipment. Background Art

[0003] Energy storage devices such as secondary batteries are widely used in electrical equipment due to their recyclable properties. In the existing end cap assembly manufacturing process, the pole is typically installed from the lower surface of the end cap (on the side closest to the electrode assembly) to the upper surface of the end cap, through the pole mounting hole in the end cap. The pole flange is located on the lower surface of the end cap and abuts against the lower plastic on the lower surface of the end cap for insulation. The upper end of the pole protrudes from the upper surface of the end cap. The upper plastic is usually formed between the pole and the end cap using an injection molding process to achieve insulation.

[0004] However, the injection molding process is inefficient, costly, and complex, making automated assembly difficult. During production, workers must wear heat-resistant gloves to handle products, and the high temperatures of the machines can easily burn them. This results in low production efficiency for energy storage devices, significantly hindering their development.

[0005] Summary of the Invention

[0006] The present application provides a pole assembly, an end cover assembly, an energy storage device and an electrical device to solve the problems of complex assembly and high production cost of existing end cover assemblies.

[0007] In a first aspect, an embodiment of the present application provides a pole assembly, comprising a pole, a first insulating member, and a base plate;

[0008] The first insulating member is provided with a positioning hole, and the positioning hole passes through the first insulating member along the thickness direction of the first insulating member;

[0009] The bottom plate is located on one side of the first insulating member in the thickness direction, and the bottom plate is provided with a fixing hole, which passes through the bottom plate in the thickness direction and is connected to the positioning hole;

[0010] The pole comprises a column portion and a flange portion, wherein the flange portion is connected to one end of the column portion, and a circumferential surface of the flange portion protrudes relative to a circumferential surface of the column portion;

[0011] The column portion passes through the positioning hole and the fixing hole, and one end of the column portion away from the flange portion is fixedly connected to the bottom plate.

[0012] In a second aspect, an embodiment of the present application provides an end cap assembly, comprising an end cap, a second insulating member and the pole assembly;

[0013] The end cover is provided with a through hole and a retaining groove, wherein the through hole penetrates the end cover along the thickness direction of the end cover, the opening of the retaining groove is located on the surface of the end cover away from the second insulating member, and the retaining groove is arranged around the through hole and communicates with the through hole;

[0014] The second insulating member is provided with a mounting hole, and the mounting hole penetrates the second insulating member along the thickness direction of the second insulating member;

[0015] The pole assembly is passed through the through hole and the mounting hole. The first insulating member includes a main body and a clamping member. The main body is provided with the positioning hole. The clamping member is fixedly connected to the side of the main body away from the base plate. The clamping member and the clamping groove are clamped with each other.

[0016] In a third aspect, an embodiment of the present application provides an energy storage device, comprising a shell, an electrode assembly and an end cover assembly, wherein the shell has an opening, the shell is provided with a receiving cavity, the electrode assembly is received in the receiving cavity, and the end cover assembly is installed at the opening at one end of the shell.

[0017] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising an energy storage device, wherein the energy storage device supplies power to the electrical device.

[0018] In summary, the pole assembly adopts an integrated structure and can be used for multiple models of end cap assemblies, thereby reducing the development cost of parts and components and the cost of process control, thereby reducing the manufacturing cost of the energy storage device; and the pole assembly is assembled by pressing down and clamping, which greatly reduces the difficulty and cost of assembling the end cap assembly, improves the assembly efficiency, and greatly increases the possibility of realizing automated batch continuous production of the end cap assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying any creative work.

[0020] FIG1 is an application scenario diagram of an energy storage system provided in an embodiment of the present application;

[0021] FIG2 is a schematic structural diagram of an energy storage device provided in a first embodiment of the present application;

[0022] FIG3 is a schematic structural diagram of the end cover assembly shown in FIG2 ;

[0023] FIG4 is an exploded structural diagram of the end cover assembly shown in FIG3 ;

[0024] FIG5 is an exploded structural diagram of the end cap assembly shown in FIG3 from another angle;

[0025] FIG6 is a partial cross-sectional structural diagram of the end cover shown in FIG4;

[0026] FIG7 is an exploded structural diagram of the pole assembly shown in FIG4 ;

[0027] FIG8 is an exploded structural diagram of the pole shown in FIG7 in another embodiment;

[0028] FIG9 is a cross-sectional structural diagram of the pole assembly shown in FIG4 ;

[0029] FIG10 is a cross-sectional structural diagram of the end cap assembly shown in FIG3;

[0030] FIG11 is an enlarged structural diagram of the M region shown in FIG10 ;

[0031] FIG12 is a schematic diagram of a portion of the structure of an end cap assembly of an energy storage device provided in a second embodiment of the present application;

[0032] FIG13 is an exploded structural diagram of the pole assembly shown in FIG12;

[0033] FIG14 is an exploded structural diagram of an end cap assembly of an energy storage device provided in a third embodiment of the present application;

[0034] FIG15 is an exploded structural view of the end cap assembly shown in FIG14 from another angle;

[0035] FIG16 is an exploded structural diagram of an end cap assembly of an energy storage device provided in a fourth embodiment of the present application;

[0036] FIG17 is an exploded structural view of the end cap assembly shown in FIG16 from another angle;

[0037] FIG18 is a partial cross-sectional structural diagram of the end cap assembly shown in FIG16;

[0038] FIG19 is an exploded structural diagram of an end cap assembly of an energy storage device provided in a fifth embodiment of the present application;

[0039] FIG20 is an exploded structural view of the end cap assembly shown in FIG19 from another angle;

[0040] FIG21 is a schematic diagram of a partial cross-sectional structure of the end cover assembly shown in FIG19.

[0041] Reference numerals: energy storage system 1000; electric energy conversion device 600; user load 500; energy storage device 400; end cover assembly 100; housing 200; end cover 10; explosion-proof valve 20; protective member 21; second insulating member 30; pole assembly 40; sealing member 50; front face 111; back face 112; through hole 12; reinforcing rib 13; pressure relief hole 14; injection hole 15; retaining groove 16; limiting portion 121; guide portion 122; retaining groove 161; first through hole 12A; second through hole 12B; first retaining groove 16A; second retaining groove 16B; first surface 311; second surface 31 2; vent portion 32; vent hole 321; mounting hole 35; accommodating groove 33; liquid inlet hole 37; first mounting hole 35A; second mounting hole 35B; first accommodating groove 33A; second accommodating groove 33B; pole 43; first insulating member 44; bottom plate 45; main body 441; retaining member 440; first surface 443; second surface 444; peripheral surface 449; positioning hole 442; positioning surface 445; retaining protrusion 446; first retaining section 447; second retaining section 448; third surface 4471; fourth surface 4472; fifth surface 4481; outer side surface 4482; top surface 448 3; guide surface 4484; fixing hole 451; fixing surface 452; column portion 431; flange portion 432; limiting surface 433; first metal portion 434; second metal portion 435; carrier 436; protrusion 437; body 438; bearing portion 439; bearing groove 4381; first pole assembly 40A; second pole assembly 40B; first sealing member 50A; second sealing member 50B; first limiting portion 10A; second limiting portion 30A; blind hole 18; first blind hole 18A; second blind hole 18B; positioning post 38; first positioning post 38A; second positioning post 38B; mounting groove 181 ; Bump 183; First mounting groove 181A; Second mounting groove 181B; Boss 383; First boss 383A; Second boss 383B; Adapter 60; Welding hole 63; First adapter 60A; Second adapter 60B; First welding hole 63A; Second welding hole 63B; Raised strip 193; Groove 191; First raised strip 193A; Second raised strip 193B; Positioning groove 391; First positioning groove 391A; Second positioning groove 391B; Raised ring 393; First raised ring 393A; Second raised ring 393B; Receiving groove 65; First receiving groove 65A; Second receiving groove 65B. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] Because the energy we need is highly temporal and spatially dependent, rationally utilizing and improving energy efficiency requires a medium or device that can store one form of energy in the same form or convert it into another, allowing it to be released in a specific form based on future application needs. As we all know, achieving the goal of carbon neutrality currently relies primarily on developing green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0044] Currently, the generation of green electricity generally relies on photovoltaics, wind power, and hydropower. However, wind and solar energy are generally intermittent and highly volatile, which can cause grid instability, insufficient electricity during peak hours, and excessive electricity during off-peak hours. Unstable voltage can also damage electricity. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar power curtailment". To solve these problems, we must rely on energy storage. That is, electrical energy is converted into other forms of energy through physical or chemical means and stored, and then converted into electrical energy and released when needed. Simply put, energy storage is like a large "power bank". When there is sufficient photovoltaic and wind energy, it stores electrical energy and releases the stored electricity when needed.

[0045] Taking electrochemical energy storage as an example, an embodiment of the present application provides an energy storage device, which is equipped with a group of chemical batteries. The chemical elements in the chemical batteries are mainly used as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage medium. Simply put, the electricity generated by wind and solar energy is stored in the chemical battery. When the use of external electricity reaches its peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0046] Currently, energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0047] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0048] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0049] Please refer to FIG1 , which is an application scenario diagram of an energy storage system 1000 provided in an embodiment of the present application.

[0050] As shown in Figure 1, the embodiment of this application uses a home energy storage scenario in user-side energy storage as an example. However, it should be understood that the energy storage system 1000 provided in this application is not limited to home energy storage scenarios. In this embodiment, the energy storage system 1000 can be a household storage system. The energy storage system 1000 includes an energy conversion device 600, a user load 500, and an energy storage device 400. The energy storage device 400 is a small energy storage box that can be mounted on an outdoor wall. For example, the energy conversion device 600 can be a photovoltaic panel. The energy conversion device 600 can convert solar energy into electricity during periods of low electricity prices. The energy storage device 400 is used to store this electricity and supply it to user loads 500 such as street lights and household appliances during peak electricity prices, or to provide power during grid power outages. In this embodiment, the energy storage device 400 can be, but is not limited to, a single cell, a battery module, a battery pack, or a battery system. For example, when the energy storage device 400 is a single battery, it can be a cylindrical battery or a square battery.

[0051] Please also refer to FIG. 2 , which is a schematic structural diagram of an energy storage device 400 provided in the first embodiment of the present application.

[0052] In this embodiment, energy storage device 400 is described using a square battery as an example. It is understood that energy storage device 400 may include, but is not limited to, single cells, battery modules, battery packs, and battery systems. The actual application scenarios of energy storage device 400 provided in this embodiment of the application may include, but are not limited to, the products listed above, as well as other application scenarios. This embodiment of the application does not impose strict restrictions on the application scenarios of batteries.

[0053] For the convenience of description, the length direction of the energy storage device 400 shown in Figure 1 is defined as the X-axis direction, the width direction of the energy storage device 400 is defined as the Y-axis direction, and the height direction of the energy storage device 400 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

[0054] The energy storage device 400 includes an end cap assembly 100, a housing 200, and an electrode assembly (not shown in FIG2 ). The housing 200 includes an opening and a receiving cavity. The electrode assembly is received in the receiving cavity. The end cap assembly 100 is mounted on the housing 200 and covers the opening.

[0055] Please refer to Figures 3 to 5. Figure 3 is a structural schematic diagram of the end cover assembly 100 shown in Figure 2, Figure 4 is an exploded structural diagram of the end cover assembly 100 shown in Figure 3, and Figure 5 is an exploded structural diagram of the end cover assembly 100 shown in Figure 3 from another angle.

[0056] The length direction of the end cap assembly 100 is the same as the length direction of the energy storage device 400, that is, the X-axis direction; the width direction of the end cap assembly 100 is the same as the width direction of the energy storage device 400, that is, the Y-axis direction; and the thickness direction of the end cap assembly 100 is the same as the height direction of the energy storage device 400, that is, the Z-axis direction.

[0057] The end cover assembly 100 includes an end cover 10, an explosion-proof valve 20, a protective member 21, a second insulating member 30, a pole assembly 40 and a sealing member 50. The explosion-proof valve 20 is installed on the end cover 10 to prevent the energy storage device 400 from exploding during use. The protective member 21 is installed on the end cover 10 to protect the explosion-proof valve 20 and prevent the external environment and external forces from damaging the explosion-proof valve 20. The second insulating member 30 is installed on one side of the end cover 10 in the thickness direction (Z-axis direction in the figure). The pole assembly 40 passes through the second insulating member 30 and the end cover 10 in sequence, and is detachably installed on the second insulating member 30 and the end cover 10. The sealing member 50 is sleeved on the pole assembly 40 and clamped between the pole assembly 40 and the end cover 10 to insulate and isolate the pole assembly 40 and the end cover 10.

[0058] In this embodiment, the end cap 10 is in the shape of an elongated plate. The end cap 10 includes a front face 111 and a back face 112, which are disposed opposite each other along the thickness direction of the end cap 10. The end cap 10 is provided with a through hole 12, a pressure relief hole 14, a liquid injection hole 15, and a retaining groove 16. The through hole 12, the pressure relief hole 14, and the liquid injection hole 15 all extend through the end cap 10 along its thickness direction, i.e., the through hole 12, the pressure relief hole 14, and the liquid injection hole 15 all extend through the front face 111 and the back face 112.

[0059] Please also refer to FIG. 6 , which is a partial cross-sectional structural diagram of the end cover 10 shown in FIG. 4 .

[0060] In this embodiment, the through holes 12 are all circular holes. The through holes 12 include a limiting portion 121 and a guide portion 122. The guide portion 122 is located on the side of the limiting portion 121 facing the second insulating member 30 and is connected to the limiting portion 121. The limiting portion 121 is recessed from the front 111 to the back 112. The guide portion 122 is recessed from the back 112 to the front 111. The aperture of the guide portion 122 gradually decreases along the recessed direction (the positive direction of the Z axis in the figure) to facilitate the assembly of the pole assembly 40. In other words, the guide portion 122 is a tapered hole, and the angle between the hole wall surface of the guide portion 122 and the hole wall surface of the limiting portion 121 is an obtuse angle.

[0061] The retaining groove 16 is disposed around the through hole 12 and is in communication with the through hole 12. The opening of the retaining groove 16 is located on the front surface 111 of the end cap 10. The retaining groove 16 is recessed from the front surface 111 to the back surface 112 of the end cap 10 and extends through the wall of the through hole 12 to communicate with the through hole 12. In this embodiment, the retaining groove 16 includes six retaining groove portions 161, which are spaced apart and disposed around the through hole 12.

[0062] Please continue to refer to Figures 4 and 5. In this embodiment, there are two through holes 12 and two holding grooves 16. The two through holes 12 are respectively the first through hole 12A and the second through hole 12B. Along the length direction of the end cover 10 (the X-axis direction in the figure), the first through hole 12, the injection hole 15, the pressure relief hole 14 and the second through hole 12B are arranged in sequence. Among them, the pressure relief hole 14 is located in the middle of the end cover 10, the first through hole 12 and the second through hole 12B are respectively located at the two ends of the length direction of the end cover 10, and the injection hole 15 is located between the pressure relief hole 14 and the first through hole 12. The two holding grooves 16 include a first holding groove 16A and a second holding groove 16B. The first holding groove 16A is arranged around the first through hole 12A and is connected to the first through hole 12A. The second holding groove 16B is arranged around the second through hole 12B and is connected to the second through hole 12B.

[0063] In one embodiment, the end cap 10 is further provided with a reinforcing rib 13, which protrudes from the back side 112 of the end cap 10 away from the front side 111. The reinforcing rib 13 is generally mesh-shaped, with some ribs 13 surrounding the periphery of the end cap 10, some ribs 13 connecting the ribs 13 provided on both sides of the end cap 10 along the width direction of the end cap 10, and located between the first through hole 12A and the pressure relief hole 14, and spaced apart from the first through hole 12A and the pressure relief hole 14; some ribs 13 connecting the ribs 13 provided on both sides of the end cap 10 along the width direction of the end cap 10, and located between the second through hole 12B and the liquid injection hole 15, and spaced apart from the second through hole 12B and the liquid injection hole 15. Exemplarily, the reinforcing rib 13 can be formed by stamping the end cap 10 from the front side 111 to the back side 112, and forming a stamped groove 13A on the front side 111. In this case, the back side of the reinforcing rib 13 is the bottom surface of the stamped groove 13A. The back side 112 of the end cover 10 is provided with a protruding reinforcing rib 13, which is beneficial to improving the structural strength of the end cover 10 in its thickness direction, preventing the end cover 10 from being squeezed and deformed by the internal pressure of the energy storage device 400, affecting the normal explosion-proof valve 20 and making the explosion-proof measures of the energy storage device 400 ineffective.

[0064] The explosion-proof valve 20 is mounted on the end cap 10 and covers the pressure relief hole 14 to block the pressure relief hole 14. The explosion-proof valve 20 covers the opening of the pressure relief hole 14 toward the second insulating member 30. The protective member 21 is mounted on the end cap 10 and covers the opening of the pressure relief hole 14 away from the second insulating member 30.

[0065] As shown in Figures 4 and 5, the second insulating member 30 is roughly in the shape of a rectangular thin plate. The second insulating member 30 includes a first surface 311 and a second surface 312, and the first surface 311 and the second surface 312 are arranged opposite to each other along the thickness direction of the second insulating member 30 (Z-axis direction in the figure). The first surface 311 is arranged opposite to the back surface 112 of the end cover 10, and the second surface 312 is arranged opposite to the front surface 111 of the end cover 10. The second insulating member 30 includes a breathable portion 32, which is located in the middle of the second insulating member 30 and is arranged opposite to the explosion-proof valve 20. The breathable portion 32 is provided with a plurality of breathable holes 321, and the breathable holes 321 pass through the second insulating member 30 along the thickness direction of the second insulating member 30. The plurality of breathable holes 321 are used to pass the pressurized gas generated by the electrode assembly to the explosion-proof valve 20. The shape of the breathable hole 321 can be circular, rectangular or fan-shaped, and the specific shape is not limited.

[0066] The second insulating member 30 is provided with a mounting hole 35, a receiving groove 33, and a liquid inlet 37. The mounting hole 35 extends through the second insulating member 30 along its thickness (Z-axis) and communicates with the through-hole 12 of the end cap 10. The receiving groove 33 is disposed around the mounting hole 35 and communicates with the mounting hole 35. The receiving groove 33 is recessed from the second surface 312 of the second insulating member 30 toward the first surface 311 and extends through the wall of the mounting hole 35 to communicate with the mounting hole 35.

[0067] In this embodiment, there are two mounting holes 35 and two receiving grooves 33. The two mounting holes 35 are respectively a first mounting hole 35A and a second mounting hole 35B. Along the length direction of the second insulating member 30 (the X-axis direction in the figure), the first mounting hole 35A and the second mounting hole 35B are located at opposite ends of the second insulating member 30. The first mounting hole 35A is arranged opposite to the first through hole 12A and is connected to the first through hole 12A. The second mounting hole 35B is arranged opposite to the second through hole 12B and is connected to the second through hole 12B.

[0068] The two accommodating grooves 33 are respectively a first accommodating groove 33A and a second accommodating groove 33B. The first accommodating groove 33A is arranged around the first mounting hole 35A, and the second accommodating groove 33B is arranged around the second mounting hole 35B. The first accommodating groove 33A is connected to the first mounting hole 35A, and the second accommodating groove 33B is connected to the second mounting hole 35B. The liquid inlet hole 37 is located between the first mounting hole 35A and the ventilating portion 32, and is spaced apart from both the first mounting hole 35A and the ventilating portion 32. The liquid inlet hole 37 is arranged opposite the liquid injection hole 15 and is connected to the liquid injection hole 15.

[0069] Please also refer to FIG. 7 , which is an exploded structural diagram of the pole assembly 40 shown in FIG. 4 .

[0070] In this embodiment, the pole assembly 40 includes a pole 43, a first insulating member 44, and a bottom plate 45. The pole 43 passes through the first insulating member 44 and the bottom plate 45 and is fixedly connected to the bottom plate 45. The first insulating member 44 is clamped between the pole 43 and the bottom plate 45.

[0071] The first insulating member 44 is made of plastic. Specifically, the first insulating member 44 is formed through an injection molding process. It is understood that the injection mold can be used to continuously produce multiple first insulating members 44. Compared to the existing injection molding and overmolding process for forming insulating members, this can significantly improve production efficiency and reduce manufacturing costs.

[0072] The first insulating member 44 includes a main body 441 and a retaining member 440, which is fixedly connected to the main body 441. The main body 441 is generally annular. The main body 441 includes a first surface 443, a second surface 444, and a peripheral surface 449. The first surface 443 and the second surface 444 are arranged opposite each other along the thickness direction of the main body 441 (the Z-axis direction in the figure), and the peripheral surface 449 is connected between the first surface 443 and the second surface 444. The first surface 443 faces away from the base plate 45, and the second surface 444 faces the base plate 45.

[0073] The main body 441 is provided with a positioning hole 442, and the positioning hole 442 is roughly runway-shaped. The positioning hole 442 is located in the middle of the main body 441 and passes through the main body 441 along the thickness direction (Z-axis direction) of the first insulating member 44. The hole wall of the positioning hole 442 includes two positioning surfaces 445, and the positioning surfaces 445 are connected between the first surface 443 and the second surface 444. The two positioning surfaces 445 are spaced and arranged opposite to each other. The positioning surfaces 445 can make the shape of the positioning hole 442 not a complete circle, thereby limiting the rotation of the pole 43 around its axial direction (Z-axis direction shown in the figure). Exemplarily, the two positioning surfaces 445 can be planes.

[0074] The retaining member 440 is fixedly connected to the first surface 443 and is used to retain the retaining groove 16. The retaining member 440 includes a plurality of retaining protrusions 446, which are provided on the first surface 443 of the main body 441. The plurality of retaining protrusions 446 are spaced around the edge of the first surface 443 of the main body 441. In this embodiment, there are six retaining protrusions 446, each of which is used to retain the six retaining grooves 16.

[0075] Each holding protrusion 446 includes a first holding section 447 and a second holding section 448, and the second holding section 448 is connected to the first holding section 447. The first holding section 447 is protruding from the first surface 443 of the main body 441, and the second holding section 448 is connected to the end of the first holding section 447 away from the first surface 443, and extends from the first holding section 447 in a direction away from the positioning hole 442. The second holding section 448 is set at an angle to the first holding section 447. Exemplarily, the angle between the first holding section and the second holding section is about 90 degrees. In other words, the holding protrusion 446 is roughly in the shape of an inverted "L".

[0076] The first retaining section 447 includes a third surface 4471 and a fourth surface 4472. The third surface 4471 and the fourth surface 4472 are arranged opposite each other along the thickness direction of the first retaining section 447. The third surface 4471 faces away from the positioning hole 442, and the fourth surface 4472 faces the positioning hole 442. The fourth surface 4472 is connected to the first surface 443 at an angle. For example, the angle between the fourth surface 4472 and the first surface 443 is approximately 90 degrees. In this embodiment, the third surface 4471 of the retaining protrusion 446 is coplanar with the peripheral surface 449 of the main body 441.

[0077] The second holding section 448 includes a fifth surface 4481, an outer side surface 4482, a top surface 4483, and a guide surface 4484. Along the height direction of the first insulating member 44 (Z-axis direction in the figure), the fifth surface 4481 and the top surface 4483 are arranged opposite to each other, and the top surface 4483 is arranged to face away from the main body 441. The outer side surface 4482 is the surface of the second holding section 448 facing away from the positioning hole 442, and is protruding relative to the third surface 4471. The guide surface 4484 is connected between the top surface 4483 and the outer side surface 4482. Among them, the guide surface 4484 is used to facilitate the assembly and disassembly of the pole assembly 40 and the end cover 10.

[0078] The bottom plate 45 is roughly plate-shaped and made of a conductive material. Specifically, the bottom plate 45 can be a welding ring. The bottom plate 45 is provided with a fixing hole 451, which is roughly runway-shaped. The fixing hole 451 is located in the middle of the bottom plate 45, and the fixing hole 451 passes through the bottom plate 45 along the thickness direction (Z-axis direction) of the bottom plate 45. The bottom plate 45 is located on one side of the second surface 444 of the main body 441. The fixing hole 451 is arranged opposite to the positioning hole 442 and is connected to the positioning hole 442. The hole wall of the fixing hole 451 includes two fixing surfaces 452, and the two fixing surfaces 452 are spaced and arranged opposite to each other. The fixing surface 452 makes the shape of the fixing hole 451 not a complete circle, which can limit the rotation of the pole 43 around its axial direction (Z-axis direction in the figure). Exemplarily, the two fixing surfaces 452 can be planes, and each fixing surface 452 can be coplanar with a positioning surface 445.

[0079] The pole 43 is made of a conductive material. The pole 43 includes a column portion 431 and a flange portion 432, and the flange portion 432 is connected to one end of the column portion 431. The column portion 431 is roughly cylindrical, and the circumferential side surface of the column portion 431 includes two limiting surfaces 433, and the two limiting surfaces 433 are spaced apart and arranged opposite to each other, and are used to cooperate with the fixing surface 452 and the positioning surface 445 to limit the rotation of the pole 43 along its axial direction (Z-axis direction in the figure). For example, the limiting surface 433 is a plane. The flange portion 432 is roughly disc-shaped, and the circumferential surface of the flange portion 432 protrudes relative to the circumferential surface of the column portion 431.

[0080] Please refer to FIG. 8 , which is an exploded structural diagram of the pole 43 shown in FIG. 7 in another embodiment.

[0081] The pole 43 includes a first metal part 434 and a second metal part 435. The first metal part 434 is fixedly connected to the second metal part 435. The first metal part 434 includes a carrier 436 and a protrusion 437, and the protrusion 437 is protruded from the middle of the carrier 436. The protrusion 437 is cylindrical and the carrier 436 is disc-shaped. The second metal part 435 includes a main body 438 and a bearing part 439, and the bearing part 439 is fixedly connected to one end of the main body 438 and is arranged around the main body 438. The main body 438 is roughly cylindrical and is provided with a bearing groove 4381. The bearing groove 4381 is roughly circular and is recessed from one end surface of the main body 438 to support the protrusion 437 of the first metal part 434. The bearing part 439 is roughly annular and is protruded from the peripheral side of the main body 438.

[0082] The protrusion 437 of the first metal portion 434 is located in the bearing groove 4381 of the second metal portion 435, and the support 436 of the first metal portion 434 abuts against the end surface of the support portion 439. The circumference of the support 436 of the first metal portion 434 and the circumference of the support portion 439 of the second metal portion 435 together form the circumference of the stopper 462. The circumference of the body 438 of the second metal portion 435 forms the circumference of the column portion 431. Please also refer to Figure 9, which is a cross-sectional structural view of the terminal assembly 40 shown in Figure 4.

[0083] The column portion 431 of the pole 43 passes through the positioning hole 442 of the main body 441 and the fixing hole 451 of the base plate 45 in sequence. Each limiting surface 433 abuts a positioning surface 445 and a fixing surface 452 to limit the rotation of the pole 43 along its axial direction (Z-axis direction in the figure), thereby improving the torsional strength of the pole 43. The end of the column portion 431 away from the flange portion 432 is installed and fixed in the fixing hole 451. The circumferential side surface of the column portion 431 and the hole wall surface of the fixing hole 451 are fixed by welding to form a welding portion S. Exemplarily, a seam welding is performed between the circumferential side surface of the column portion 431 and the hole wall surface of the fixing hole 451 to form a welding portion S, so that the column portion 431 is fixedly connected to the base plate 45. Since the welding machine power of the seam welding is relatively low, it can meet the requirements of energy conservation and emission reduction. The flange portion 432 is held against the first surface 443 of the main body 441 , and the first insulating member 44 is clamped between the flange portion 432 and the bottom plate 45 .

[0084] The circumferential surface of the flange portion 432 is spaced apart from and opposite to the fourth surface 4472 of the retaining protrusion 446. The gap between the circumferential surface of the flange portion 432 and the fourth surface 4472 of the retaining protrusion 446 forms a deformation space, which facilitates the deformation of the retaining protrusion 446 toward the flange portion 432, thereby facilitating the disassembly and assembly of the pole assembly 40.

[0085] Please refer to FIG. 10 and FIG. 11 . FIG. 10 is a cross-sectional structural diagram of the end cover assembly 100 shown in FIG. 3 , and FIG. 11 is an enlarged structural diagram of the M region shown in FIG. 10 .

[0086] The first insulating member 44 and the pole 43 of the pole assembly 40 sequentially pass through the mounting hole 35 of the second insulating member 30 and the guide portion 122 of the end cap 10, and are guided into the limiting portion 121 by the guide portion 122. The retaining member 440 is retained in the retaining groove 16, and the base plate 45 is accommodated in the accommodating groove 33 of the second insulating member 30, thereby enabling the pole assembly 40 to clamp the second insulating member 30 and the end cap 10. Specifically, the six retaining protrusions 446 are respectively retained in the six retaining grooves 161, and the fifth surface 4481 of each retaining protrusion 446 is crimped to the bottom surface of the retaining groove 161. In other embodiments, the top surface 4483 of each retaining protrusion 446 can be located on the side of the front face 111 of the end cap 10 facing the second insulating member 30, or can be flush with the front face 111. In other words, the top surface 4483 can be flush with or lower than the front surface 111 of the end cap 10 to reduce the thickness of the end cap assembly 100. The third surface 4471 of each retaining protrusion 446 abuts against the hole wall of the retaining portion 121. The portion of the surface of the bottom plate 45 facing the first insulating member 44 is pressed against the bottom surface of the accommodating groove 33, and the side surface of the bottom plate 45 is disposed opposite the side surface of the accommodating groove 33.

[0087] Please continue to refer to Figures 4 and 5. In this embodiment, there are two pole assemblies 40, namely a first pole assembly 40A and a second pole assembly 40B. The first pole assembly 40A is installed in the first mounting hole 35A of the second insulating member 30 and the first through hole 12A of the end cover 10, and is mutually clamped with the first clamping groove 16A so as to be detachably mounted on the end cover 10. The second pole assembly 40B is installed in the second mounting hole 35B of the second insulating member 30 and the second through hole 12B of the end cover 10, and is mutually clamped with the second clamping groove 16B so as to be detachably mounted on the end cover 10. The pole assembly 40 can be used for multiple models of end cover assemblies 100, thereby reducing the development cost of components and the process control cost, thereby reducing the manufacturing cost of the energy storage device 400.

[0088] Among them, the first pole assembly 40A is a positive pole assembly, and the pole 43 and the base plate 45 of the first pole assembly 40A are both made of metal aluminum. The second pole assembly 40B is a negative pole assembly. The pole 43 of the second pole assembly 40B includes a first metal part 434 and a second metal part 435. The first metal part 434 is made of aluminum, and the second metal part 435 is made of copper. The pole 43 of the second pole assembly 40B is stamped from copper-aluminum plates. The base plate 45 of the second pole assembly 40B is made of copper. In other embodiments, the first pole assembly 40A may also be a negative pole assembly, and the second pole assembly 40B may be a positive pole assembly, and the corresponding relationship is not specifically limited.

[0089] Continuing with Figures 4, 5, and 11, in this embodiment, the seal 50 is a sealing ring made of an insulating material such as plastic. The seal 50 is sleeved around the circumference of the main body 441 and spaced apart from the main body 441. The seal 50 is clamped between the back surface 112 of the end cap 10 and the base plate 45. This not only insulates the pole assembly 40 from the end cap 10, but also improves the sealing performance of the end cap 10 and the pole assembly 40, thereby enhancing the sealing performance of the assembled end cap assembly 100.

[0090] In this embodiment, two seals 50 are provided: a first seal 50A and a second seal 50B. The first seal 50A is sleeved around the body 441 of the first pole assembly and is held between the back 112 of the end cap 10 and the bottom plate 45 of the first pole assembly. The second seal 50B is sleeved around the body 441 of the second pole assembly and is held between the back 112 of the end cap 10 and the bottom plate 45 of the second pole assembly.

[0091] Continuing with FIG11 , in this embodiment, the pole assembly 40 is fitted with the seal 50 and secured in a fixture. The second insulating member 30 and the end cap 10 are then sequentially fitted onto the pole assembly 40. A press is then used to apply downward pressure (in the negative Z-axis direction) to the end cap 10, causing the clamping member 440 of the pole assembly 40 to be guided to the limiting portion 121 via the guide portion 122 and clamped within the clamping groove 16. Assembling the pole assembly 40 by downward pressure and clamping greatly reduces the difficulty and cost of assembling the end cap assembly 100, improves assembly efficiency, and significantly increases the possibility of automated batch production of the end cap assembly 100.

[0092] At the same time, since the sealing member 50 is located between the wall surface of the mounting hole 35 and the peripheral surface 449 of the first insulating member 44, and is spaced apart from the first insulating member 44, deformation of the first insulating member 44 will not reduce the compression of the sealing member 50 and cause the risk of electrolyte leakage, nor will the pole 43 sink into the first insulating member 44, resulting in poor welding between the energy storage device 400 and the busbar.

[0093] Please also refer to Figure 9. Furthermore, because there is a deformation space between the circumference of the flange portion 432 of the pole 43 and the fourth surface 4472 of the retaining protrusion 446 of the first insulating member 44, inserting a latch into the retaining groove 161 causes the retaining protrusion 446 to deform radially toward the flange portion 432 of the first insulating member 44 and exit the retaining groove 161. When all six retaining grooves 161 are inserted with latches, the six retaining protrusions 446 deform and retract toward the flange portion 432, releasing their engagement with the retaining grooves 161. After deformation and retraction, the pole assembly 40A can be easily withdrawn from the through-hole 12 and mounting hole 35, releasing its engagement with the second insulating member 30 and end cap 10, and can be removed from the end cap assembly 100.

[0094] In summary, the pole assembly 40 is a detachable module, that is, the pole assembly 40 can be released from the clamping with the second insulating member 30 and the end cover 10, and removed from the end cover assembly 100. In this embodiment, the end cover assembly 100 is assembled by pressing the end cover 10 to clamp the pole assembly 40, so when the pole assembly 40 is removed from the end cover assembly 100, the end cover 10, the second insulating member 30 and the sealing member 50 are all in an active state. During the production process of the end cover assembly 100, if defective products occur, such as poor airtightness, defective second insulating member 30 or end cover 10, the end cover assembly 100 can be disassembled and reworked and the corresponding components can be replaced in time, which significantly reduces the cost of scrapping defective products. In the end cover assembly 100 provided in the present application, the end cover 10 and the second insulating member 30 are separable, which is conducive to the classification of defective products after scrapping, further reducing the cost of scrapping defective products.

[0095] The end cap assembly 100 also includes an adapter plate (not shown in Figures 1 to 11), which is connected to the side of the pole assembly 40 facing away from the second insulating member 30. The adapter plate is roughly in the shape of a thin sheet, made of a conductive material, and is used to electrically connect the pole assembly 40 and the electrode assembly. The adapter plate is fixedly connected to the surface of the base plate 45 facing away from the first insulating member 44. In this embodiment, the adapter plate is connected to the base plate 45 by penetration welding. In this embodiment, there are two adapter plates, and the two adapter plates are the first adapter plate and the second adapter plate. The first adapter plate electrically connects the first pole assembly 40A and the electrode assembly, and the second connecting plate electrically connects the second pole assembly 40B and the electrode assembly.

[0096] Please refer to Figures 12 and 13 together. Figure 12 is a partial structural diagram of the end cover assembly 100 in the energy storage device provided in the second embodiment of the present application, and Figure 13 is an exploded structural diagram of the pole assembly 40 shown in Figure 12.

[0097] As shown in FIG13 , the end cap assembly 100 of the second embodiment differs from the end cap assembly 100 of the first embodiment in that the retaining groove 16 of the end cap 10 is an annular groove disposed around the through hole 12. In the terminal assembly 40 , the number of retaining protrusions 446 is twenty-four, and the twenty-four retaining protrusions 446 are spaced apart around the edge of the first surface 443 of the main body 441 .

[0098] After the pole assembly 40A passes through the mounting hole 35 of the second insulating member 30 and the through hole 12 of the end cap 10, the retaining member 440 is retained in the retaining groove 16. The fifth surface 4481 of each retaining protrusion 446 is pressed against the bottom surface of the retaining groove portion 161. The fourth surface 4472 of each retaining protrusion 446 abuts against the hole wall of the retaining portion 121.

[0099] Compared with the first embodiment, the pole assembly 40 of the second embodiment adopts more clamping protrusions 446 and annular clamping grooves 16 for clamping, thereby improving the thrust strength on the first insulating member 44 when the pole assembly 40 enters the limiting portion 121 through the guide portion 122, reducing the difficulty of clamping the pole assembly 40 and the end cover 10, and improving the assembly efficiency of the end cover assembly 100.

[0100] Please refer to Figures 14 and 15. Figure 14 is an exploded structural diagram of the end cover assembly 100 of the energy storage device provided in the third embodiment of the present application, and Figure 15 is an exploded structural diagram of the end cover assembly 100 shown in Figure 14 from another angle.

[0101] The end cover assembly 100 of the third embodiment differs from the end cover assembly 100 of the first embodiment in that the end cover 10 includes a first limiting portion 10A, which is provided on the surface of the end cover 10 facing the second insulating member 30 and is arranged around the through hole 12; the second insulating member 30 includes a second limiting portion 30A, which is provided on the surface of the second insulating member 30 facing the end cover 10 and is arranged around the mounting hole 35, and is mutually limited with the first limiting portion 10A.

[0102] In this embodiment, the first limiting portion 10A is a blind hole 18, which is recessed from the back surface 112 of the end cap 10 toward the front surface 111. There are multiple blind holes 18, each spaced apart around the through hole 12. The multiple blind holes 18 include multiple first blind holes 18A and multiple second blind holes 18B. The multiple first blind holes 18A are spaced apart around the first through hole 12A, and the multiple second blind holes 18B are spaced apart around the second through hole 12B. Exemplarily, there are eight blind holes 18, with four each of the first blind holes 18A and the second blind holes 18B.

[0103] In this embodiment, the second limiting portion 30A is a positioning post 38, which is protruding from the first surface 311 of the second insulating member 30. There are multiple positioning posts 38, each of which is spaced apart around the mounting hole 35 and corresponds one-to-one with the multiple blind holes 18. The multiple positioning posts 38 include multiple first positioning posts 38A and multiple second positioning posts 38B. The multiple first positioning posts 38A are spaced apart around the first mounting hole 35A and correspond one-to-one with the multiple first blind holes 18A. The multiple second positioning posts 38B are spaced apart around the second mounting hole 35B and correspond one-to-one with the multiple second blind holes 18B. Exemplarily, there are eight positioning posts 38, with four first positioning posts 38A and four second positioning posts 38B.

[0104] After the pole assembly 40 is sequentially secured to the second insulating member 30 and the end cap 10 through the first mounting hole 35 and the first through hole 12, the first surface 311 of the second insulating member 30 is positioned opposite the back surface 112 of the end cap 10, and the plurality of positioning posts 38 are respectively inserted into the plurality of blind holes 18. This can restrict relative movement between the second insulating member 30 and the end cap 10 in the length direction (X-axis direction) and width direction (Y-axis direction) of the end cap assembly 100, thereby improving the assembly accuracy of the end cap assembly 100. Furthermore, the plurality of positioning posts 38 surrounding the mounting hole 35 and the plurality of blind holes 18 surrounding the through hole 12 are now disposed around the pole assembly 40, thereby increasing the torsional strength of the pole assembly 40 and preventing the poles 43 of the pole assembly 40 from being damaged by twisting.

[0105] Please refer to Figures 16 to 18. Figure 16 is a decomposition structure diagram of the end cover assembly 100 of the energy storage device 400 provided in the fourth embodiment of the present application. Figure 17 is a decomposition structure diagram of the end cover assembly 100 shown in Figure 16 from another angle. Figure 18 is a partial cross-sectional structure schematic diagram of the end cover assembly 100 shown in Figure 16.

[0106] The end cap assembly 100 of the fourth embodiment differs from the end cap assembly 100 of the third embodiment in that the first limiting portion 10A is a mounting groove 181. The mounting groove 181 is recessed from the back surface 112 toward the front surface 111 and extends through the wall surface of the through hole 12 to communicate with the through hole 12. The mounting groove 181 is a rectangular groove. For example, the mounting groove 181 can be formed by stamping the end cap 10 from the back surface 112 toward the front surface 111, and a convex bump 183 is formed on the front surface 111. In this case, the back surface of the convex bump 183 serves as the bottom surface of the mounting groove 181.

[0107] In this embodiment, there are two mounting grooves 181, namely a first mounting groove 181A and a second mounting groove 181B. Along the length direction of the end cover 10 (the X-axis direction in the figure), the first mounting groove 181A and the second mounting groove 181B are respectively located at opposite ends of the end cover 10. The first mounting groove 181A passes through the wall surface of the first through hole 12A and is in communication with the first through hole 12A, and the second mounting groove 181B passes through the wall surface of the second through hole 12B and is in communication with the second through hole 12B.

[0108] In this embodiment, the second limiting portion 30A is a boss 383. The boss 383 protrudes from the first surface 311 away from the second surface 312 and is positioned corresponding to the mounting groove 181. The boss 383 is a rectangular protrusion 437. In this embodiment, there are two bosses 383: a first boss 383A and a second boss 383B. Along the length of the second insulating member 30, the first boss 383A and the second boss 383B are located at opposite ends of the second insulating member 30. The first boss 383A is positioned corresponding to the first mounting groove 181A, and the second boss 383B is positioned corresponding to the second mounting groove 181B.

[0109] Referring to Figure 18, when the second insulating member 30 and the end cap 10 are sequentially sleeved on the pole assembly 40, the first surface 311 of the second insulating member 30 is opposite to the back surface 112 of the end cap 10, and the boss 383 is installed in the mounting groove 181, which can limit the relative movement of the second insulating member 30 and the end cap 10 in the length direction (X-axis direction) and width direction (Y-axis direction) of the end cap assembly 100, thereby improving the assembly accuracy of the end cap assembly 100. In addition, the rectangular boss 383 is installed in the rectangular mounting groove 181, which can also limit the relative rotation of the second insulating member 30 and the end cap 10, thereby improving the torsional strength of the pole assembly 40 passing through the boss 383 and the mounting groove 181. At the same time, in this embodiment, the thickness of the end cap assembly 100 is relatively thin in the area outside the pole assembly 40 and the surrounding convex bulge 183, which helps to increase the battery cell capacity of the energy storage device 400 and improve the storage capacity of the energy storage device 400.

[0110] Referring to FIG. 16 , the adapter plate 60 is provided with a welding hole 63, which penetrates the adapter plate 60 along the thickness direction of the adapter plate 60. For example, the welding hole 63 is a rectangular hole. The adapter plate 60 is located on the side of the second insulating member 30 away from the end cover 10. The adapter plate 60 is sleeved on the periphery of the bottom plate 45. The hole wall of the welding hole 63 and the peripheral surface of the bottom plate 45 are fixed by welding to form a welding portion Q. In this embodiment, a butt weld is performed between the peripheral surface of the bottom plate 45 and the hole wall of the welding hole 63 to fix the bottom plate 45 to the adapter plate 60. Compared with penetration welding, the welding machine power of butt weld is lower and can better meet the requirements of energy conservation and emission reduction.

[0111] Continuing with Figures 16 and 18 , in this embodiment, there are two adapter plates 60: a first adapter plate 60A and a second adapter plate 60B. The first adapter plate 60A is provided with a first welding hole 63A. The first adapter plate 60A is mounted around the periphery of the bottom plate 45 of the first pole assembly 40A and is welded to the bottom plate 45 of the first pole assembly 40A. The second adapter plate 60B is provided with a second welding hole 63B. The second adapter plate 60B is mounted around the periphery of the bottom plate 45 of the second pole assembly 40B and is welded to the bottom plate 45 of the second pole assembly 40B.

[0112] Please refer to Figures 19 to 21. Figure 19 is a decomposition structure diagram of the end cover assembly 100 of the energy storage device 400 provided in the fifth embodiment of the present application. Figure 20 is a decomposition structure diagram of the end cover assembly 100 shown in Figure 19 from another angle. Figure 21 is a partial cross-sectional structure schematic diagram of the end cover assembly 100 shown in Figure 19.

[0113] The end cap assembly 100 of the fifth embodiment differs from the end cap assembly 100 of the fourth embodiment in that the first limiting portion 10A is a ridge 193 disposed around the through hole 12 and spaced apart from the through hole 12. The ridge 193 protrudes from the back surface 112 of the end cap 10, away from the front surface 111. The ridge 193 may be in the shape of a square ring. For example, the ridge 193 may be formed by stamping the end cap 10 from the front surface 111 toward the back surface 112, and forming a groove 191 on the front surface 111. In this case, the back surface of the ridge 193 forms the bottom surface of the groove 191. In this embodiment, there are two ridges 193, namely a first ridge 193A and a second ridge 193B. Along the length direction of the end cap 10 (the X-axis direction in the figure), the first ridge 193A and the second ridge 193B are located at opposite ends of the end cap 10. The first protrusion 193A is disposed around the first through hole 12A, and the second protrusion 193B is disposed around the second through hole 12B.

[0114] In this embodiment, the second limiting portion 30A is a positioning groove 391, which is arranged around the mounting hole 35 and is spaced apart from the mounting hole 35. The positioning groove 391 is recessed from the first surface 311 of the second insulating member 30 toward the second surface 312. Exemplarily, the positioning groove 391 is a rectangular annular groove. There are two positioning grooves 391, namely a first positioning groove 391A and a second positioning groove 391B. Along the length direction of the second insulating member 30, the first positioning groove 391A and the second positioning groove 391B are respectively located at opposite ends of the second insulating member 30. The first positioning groove 391A is arranged around the first mounting hole 35A and is arranged corresponding to the first protrusion 193. The second positioning groove 391B is arranged around the second mounting hole 35B and is arranged corresponding to the first protrusion 193.

[0115] The second insulating member 30 is further provided with a raised ring 393, which surrounds the mounting hole 35 and is spaced apart from the mounting hole 35. The raised ring 393 protrudes from the second surface 312 of the second insulating member 30 in a direction away from the first surface 311. The projection of the raised ring 393 on the first surface 311 covers the positioning groove 391. For example, the raised ring 393 may be in the shape of a square ring.

[0116] In this embodiment, there are two protruding rings 393, namely a first protruding ring 393A and a second protruding ring 393B. Along the length direction (the X-axis direction in the figure) of the second insulating member 30, the first protruding ring 393A and the second protruding ring 393B are respectively located at opposite ends of the second insulating member 30. The first protruding ring 393A is disposed around the first mounting hole 35A, and the second protruding ring 393B is disposed around the second mounting hole 35B.

[0117] Please refer to Figure 21. When the second insulating member 30 and the end cover 10 are sequentially mounted on the pole assembly 40, the first surface 311 of the second insulating member 30 is opposite to the back surface 112 of the end cover 10, and the two protrusions 193 are respectively installed in the two positioning grooves 391, which can limit the relative movement of the second insulating member 30 and the end cover 10 in the length direction (X-axis direction) and width direction (Y-axis direction) of the end cover assembly 100, thereby improving the assembly accuracy of the end cover assembly 100, and can also limit the relative rotation of the second insulating member 30 and the end cover 10 to enhance the torsional strength of the pole assembly 40.

[0118] Continuing with Figures 19 and 21 , the adapter plate 60 further includes a receiving groove 65. The receiving groove 65 is disposed around the welding hole 63 and spaced apart from the welding hole 63. The receiving groove 65 is recessed from the surface of the adapter plate 60 facing the second insulating member 30 in a direction away from the second insulating member 30. The receiving groove 65 is disposed corresponding to the protruding ring 393. Exemplarily, the receiving groove 65 is a rectangular annular groove.

[0119] The adapter plate 60 is located on the side of the second insulating member 30 facing away from the end cap 10. It is sleeved around the periphery of the base plate 45. The wall surface of the welding hole 63 is welded to the periphery of the base plate 45, forming a welded portion Q. The two raised rings 393 of the second insulating member 30 are respectively mounted in the receiving grooves 65 of the two adapter plates 60 to limit the relative rotational movement of the adapter plate 60 with respect to the second insulating member 30. This reduces the torsional stress that the adapter plate 60 may exert on the base plate 45 of the pole assembly 40, thereby preventing failure of the pole assembly 40 due to torsional forces.

[0120] In this embodiment, the first adapter plate 60A is provided with a first receiving groove 65A. The first adapter plate 60A is sleeved around the periphery of the bottom plate 45 of the first pole assembly 40A, and the first protruding ring 393A is mounted in the first receiving groove 65A. The second adapter plate 60B is provided with a second receiving groove 65B. The second adapter plate 60B is sleeved around the periphery of the bottom plate 45 of the second pole assembly 40B, and the second protruding ring 393B is mounted in the second receiving groove 65B.

[0121] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein 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 those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pole assembly, It is characterized in that It includes a pole, a first insulating member and a bottom plate; The first insulating member is provided with a positioning hole, and the positioning hole penetrates the first insulating member along the thickness direction of the first insulating member; The bottom plate is located at one side of the first insulating member in the thickness direction, and the bottom plate is provided with a fixing hole, the fixing hole penetrates the bottom plate in the thickness direction of the bottom plate and is connected with the positioning hole; The pole comprises a column part and a flange part, wherein the flange part is connected to one end of the column part, and the peripheral surface of the flange part protrudes relative to the peripheral surface of the column part; The column portion passes through the positioning hole and the fixing hole, and one end of the column portion away from the flange portion is fixedly connected to the bottom plate.

2. The pole assembly according to claim 1, It is characterized in that The peripheral side surface of the column part and the hole wall surface of the fixing hole are fixed by welding.

3. The pole assembly according to claim 1, It is characterized in that The positioning hole and the fixing hole are both runway-shaped holes, the hole wall of the positioning hole includes at least one positioning surface, the positioning surface is a plane, the hole wall of the fixing hole includes at least one fixing surface, the fixing surface is a plane, and the peripheral surface of the pole includes at least one limiting surface, the limiting surface is a plane, and the limiting surface abuts the positioning surface and the fixing surface.

4. The pole assembly according to any one of claims 1 to 3, It is characterized in that The pole comprises a first metal part and a second metal part, the first metal part is made of aluminum, the second metal part is made of copper, and the pole is a structural member formed by stamping copper-aluminum plates.

5. An end cap assembly, It is characterized in that comprising an end cover, a second insulating member and a pole assembly as claimed in any one of claims 1 to 4; The end cover is provided with a through hole and a holding groove, the through hole penetrates the end cover along the thickness direction of the end cover, the opening of the holding groove is located on the surface of the end cover away from the second insulating member, the holding groove is arranged around the through hole and communicates with the through hole; The second insulating member is provided with a mounting hole, and the mounting hole penetrates the second insulating member along the thickness direction of the second insulating member; The pole assembly is passed through the through hole and the mounting hole, the first insulating member includes a main body and a clamping member, the main body is provided with the positioning hole, the clamping member is fixedly connected to a side of the main body away from the bottom plate, and the clamping member and the clamping groove are clamped with each other.

6. The end cap assembly according to claim 5, It is characterized in that The main body is clamped between the flange portion and the bottom plate, and the clamping member is spaced apart from the flange portion.

7. The end cap assembly according to claim 6, It is characterized in that The end cover assembly further comprises a sealing member, which is sleeved on the pole assembly, clamped between the bottom plate and the end cover, and spaced apart from the first insulating member.

8. The end cap assembly according to claim 6, It is characterized in that The clamping member includes an outer side surface, a top surface and a guide surface. The top surface is arranged away from the main body, the outer side surface is arranged away from the positioning hole, and the guide surface is connected between the outer side surface and the top surface.

9. The end cap assembly according to claim 8, It is characterized in that The through hole includes a limiting portion and a guiding portion, wherein the guiding portion is located on the side of the limiting portion facing the second insulating member and is communicated with the limiting portion, and the aperture of the guiding portion gradually decreases along the recessed direction, and the first insulating member is introduced into the limiting portion through the guiding portion.

10. The end cap assembly according to claim 5, It is characterized in that The end cover comprises a first limiting portion, which is arranged on a surface of the end cover facing the second insulating member and is arranged around the through hole; The second insulating member includes a second limiting portion, which is disposed on a surface of the second insulating member facing the end cover, is disposed around the mounting hole, and is mutually limited with the first limiting portion.

11. The end cap assembly according to claim 10, It is characterized in that The first limiting portion includes a plurality of blind holes, and the plurality of blind holes are arranged at intervals around the through hole; The second limiting portion includes a plurality of positioning posts, and the plurality of positioning posts are arranged at intervals around the mounting hole; each of the positioning posts is inserted into one of the blind holes.

12. The end cap assembly according to claim 10, It is characterized in that The first limiting portion includes a mounting groove, and the mounting groove is arranged around the through hole. The second limiting portion includes a boss, and the boss is arranged around the mounting hole; the boss is installed in the mounting groove.

13. The end cap assembly according to claim 10, It is characterized in that The first limiting portion includes a convex strip, and the convex strip is arranged around the through hole. The second limiting portion includes a positioning groove, and the positioning groove is arranged around the mounting hole; the convex strip is installed in the positioning groove.

14. The end cap assembly according to any one of claims 5 to 13, It is characterized in that The end cover assembly also includes an adapter plate, which is provided with a welding hole, and the welding hole penetrates the adapter plate along the thickness direction of the adapter plate; the adapter plate is sleeved on the periphery of the bottom plate and welded to the bottom plate.

15. The end cap assembly according to claim 14, It is characterized in that The adapter plate is further provided with a receiving groove, which is arranged around the welding hole, spaced apart from the welding hole, and is recessed from the surface of the adapter plate facing the second insulating member to a direction away from the second insulating member; The second insulating member is further provided with a convex ring, which is arranged around the mounting hole and spaced apart from the mounting hole, and protrudes from a surface of the second insulating member away from the end cover in a direction away from the end cover; The convex ring is installed in the accommodating groove.

16. The end cap assembly according to claim 5, It is characterized in that The end cover is provided with a pressure relief hole, which penetrates the end cover along the thickness direction of the end cover and is spaced apart from the through hole; The end cover is provided with a reinforcing rib, and the reinforcing rib is convexly arranged on the surface of the end cover facing the second insulating member. The reinforcing ribs are arranged around the periphery of the end cover, and part of the reinforcing ribs are connected to the reinforcing ribs arranged on both sides of the end cover along the width direction of the end cover, and are located between the through hole and the pressure relief hole, and are spaced apart from the through hole and the pressure relief hole.

17. An energy storage device, It is characterized in that It comprises a shell, an electrode assembly and an end cap assembly as claimed in any one of claims 5 to 16, wherein the shell has an opening, the shell is provided with a receiving cavity, the electrode assembly is received in the receiving cavity, and the end cap assembly is installed at the opening at one end of the shell.

18. An electrical device, It is characterized in that It includes the energy storage device as described in claim 17, and the energy storage device supplies power to the electrical equipment.

Images