Current collector plate, end cover assembly, energy storage device, energy storage module and electric equipment

Abstract

The application provides a current collecting disc, an end cover assembly, an energy storage device, an energy storage module and an electric equipment. The current collecting disc comprises a disc body and a boss. The boss is arranged on the surface of the disc body and protrudes relative to the disc body. The boss comprises a first step and a second step. The first step is arranged on the surface of the disc body and protrudes relative to the surface of the disc body. The second step is arranged on the surface of the first step and away from the surface of the disc body. The current collecting disc is provided with a groove. The opening of the groove is located on the surface of the first step away from the disc body. The groove is recessed from the surface of the first step away from the disc body to the direction towards the disc body and is arranged around the second step. The current collecting disc can collect the welding slag generated by the welding of the current collecting disc and the end cover, thereby improving the use safety performance of the energy storage device.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a collector plate, end cap assembly, energy storage device, energy storage module and electrical equipment. Background Technology

[0002] During the assembly of energy storage devices, welding slag is generated when welding the current collector and end cap. The slag can fall through the pores inside the energy storage device and onto the electrode assembly, causing a short circuit upon contact with the electrode assembly, which can affect the safety of the energy storage device. Summary of the Invention

[0003] The purpose of this application embodiment is to provide a collector plate, an end cap assembly, an energy storage device, an energy storage module, and an electrical device. The collector plate can collect the welding slag generated during the welding of the collector plate and the end cap, thereby improving the safety performance of the energy storage device.

[0004] This application provides a collector plate, including a plate body and a boss. The boss is disposed on the surface of the plate body and protrudes relative to the plate body. The boss includes a first step and a second step. The first step is disposed on the surface of the plate body and protrudes relative to the surface of the plate body. The second step is disposed on the surface of the first step away from the surface of the plate body.

[0005] The collector plate is provided with a groove. The opening of the groove is located on the surface of the first step away from the plate body. The groove is recessed from the surface of the first step away from the plate body towards the plate body and is arranged around the second step.

[0006] Welding slag is generated during the welding process between the collector plate and the end cap. The collector plate provided in this application provides a groove in the collector plate, which allows the welding slag to fall into the groove along the outer peripheral surface of the second step, thereby preventing the welding slag from falling into the plate body and thus preventing the welding slag from contacting the electrode assembly through the pores of the plate body and causing a short circuit, thus improving the safety performance of the energy storage device.

[0007] In one possible implementation, the groove is an annular groove. By setting the groove as an annular groove, the groove is arranged around the entire circumference of the second step, which facilitates the slag formed during the welding process between the collector plate and the end cover to slide down the outer circumference of the second step into the groove at various points, ensuring the slag collection effect and improving the safety performance of the energy storage device.

[0008] In one possible implementation, the projection of the second step onto the first step along the axial direction of the collector plate is circular, and the groove is an annular groove.

[0009] In one possible implementation, the depth of the groove is D, where 3.2 mm ≤ D ≤ 6.88 mm.

[0010] In one possible implementation, the width of the groove is W1, where 2.4mm ≤ W1 ≤ 4.5mm.

[0011] In one possible implementation, the angle between the outer peripheral surface of the second step and the surface of the first step away from the first step in the direction away from the first step is θ, where θ ≥ 90°.

[0012] In one possible implementation, 155°≤θ≤175° creates a slope on the outer periphery of the second step. This facilitates welding the collector plate and end cap at an angle similar to laser welding, making welding easier. Simultaneously, when weld slag falls, it can slide down the slope formed by the outer periphery of the second step into the groove, allowing for easy slag removal and thus improving the safety performance of the energy storage device.

[0013] In one possible implementation, the boss further includes a third step, which is located on the side of the second step away from the first step. The angle between the outer peripheral surface of the third step and the surface of the first step away from the disk body is α, where α < θ. The outer peripheral surface of the third step can, to a certain extent, prevent the welding slag in the groove from falling out.

[0014] In one possible implementation, the disk body is disc-shaped, the boss is rotationally symmetrical, and the central axis of the boss coincides with the central axis of the disk body.

[0015] This application provides an end cap assembly, including an end cap and a collector plate as described above. The end cap has a mounting hole that extends through the end cap along its thickness direction. The collector plate is fixedly connected to the end cap. The plate body is spaced apart from the end cap. A boss passes through the mounting hole. A first step abuts against the surface of the end cap facing the plate body. A second step is located inside the mounting hole.

[0016] In one possible implementation, the outer peripheral surface of the second step is spaced apart from the inner peripheral surface of the mounting hole, forming a gap.

[0017] In one possible implementation, the gap is connected to the groove, allowing the welding slag generated during the welding process between the collector and the end cap to fall into the groove through the gap. This allows the welding slag to fall into the groove quickly, preventing it from falling onto the plate and thus avoiding short circuits between the welding slag and the electrode assembly through the vent holes of the plate, thereby improving the safety performance of the energy storage device.

[0018] In one possible implementation, the width of the gap is W2, where 1mm ≤ W2 ≤ 3.5mm.

[0019] This application also provides an energy storage device, including a housing and an end cap assembly as described above, the end cap assembly being mounted on the housing.

[0020] This application embodiment also provides an energy storage module, including a housing and a plurality of energy storage devices as described above. The plurality of energy storage devices are all installed inside the housing, and the end cap assembly in each energy storage device faces the lower end of the housing.

[0021] This application embodiment also provides an electrical device, which includes the energy storage module as described above, and the energy storage module supplies power to the electrical device. Attached Figure Description

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

[0023] Figure 1 This application provides an illustration of an energy storage system application scenario.

[0024] Figure 2 This is a top view of the energy storage module provided in the first embodiment of this application;

[0025] Figure 3 for Figure 2 A schematic diagram of the energy storage device in the energy storage module shown;

[0026] Figure 4 for Figure 3 An exploded view of the end cap assembly on the positive electrode side of the energy storage device shown.

[0027] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure of the end cap in the end cap assembly shown.

[0028] Figure 6 for Figure 4 A schematic diagram of the collector disk in the end cap assembly shown;

[0029] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure of the collector disk shown;

[0030] Figure 8 for Figure 7 A partial enlarged view of part A in the schematic diagram of the cross-sectional structure shown;

[0031] Figure 9 for Figure 4 A schematic diagram of the cross-sectional structure of the end cap assembly shown;

[0032] Figure 10 This is a schematic cross-sectional view of the end cap assembly provided in the second embodiment of this application.

[0033] Reference numerals: 1. Energy storage system; 2. Energy storage module; 1100. Power conversion device; 1200. User load; 1300. Energy storage device; 1400. Housing; 100. Shell; 300. End cap assembly; 10. End cap; 11. Mounting hole; 111. First hole portion; 112. Second hole portion; 12. Pressure relief hole; 20. Explosion-proof valve; 21. Protective component; 30. Collector plate; 31. Plate body; 301. First surface; 302. Second surface; 303. Side; 311. Welding groove; 312. Vent hole; 32. Folded edge; 33. Boss; 331. First step; 332. Second step; 333. Third step; 34. Groove; 35. Liquid injection hole; 40. Gap; 50. Clearance. Detailed Implementation

[0034] 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.

[0035] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve its efficiency, we need a medium or device 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 for future applications. As we all know, to achieve the grand goal of carbon neutrality, the main way to generate green electricity is currently through the development of green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0036] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power 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 can 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, then releasing the energy back into electricity when needed. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0037] Taking electrochemical energy storage as an example, embodiments of this application provide an energy storage module, which includes multiple energy storage devices. Each energy storage device contains a set of chemical batteries, primarily utilizing the chemical elements within the batteries as the energy storage medium. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage medium. Simply put, it stores electrical energy generated by wind and solar power in the chemical batteries, releasing the stored energy for use when external power demand reaches its peak, or transferring it to areas with power shortages.

[0038] Current energy storage applications are quite widespread, including 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:

[0039] (1) Large energy storage containers applied in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, realize load matching of electrical energy in time and space, enhance the absorption capacity of renewable energy, and play a significant role in grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0040] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in home energy storage scenarios mainly operate under the "peak shaving and valley filling" mode. Since there are significant price differences in electricity prices at peak and valley times based on electricity demand, users with energy storage devices usually charge the energy storage cabinets / boxes during periods of low electricity prices and release the electricity from the energy storage devices during periods of high electricity prices to save on electricity costs. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to providing backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0041] Please see Figure 1 , Figure 1 This is an application scenario diagram of the energy storage system 1 provided in the embodiments of this application.

[0042] like Figure 1As shown, this application embodiment uses a home energy storage scenario in user-side energy storage as an example for illustration, but it should be understood that the energy storage system 1 provided in this application is not limited to the home energy storage scenario. In this embodiment, the energy storage system 1 can be a home energy storage system. The energy storage system 1 includes a power conversion device 1100, a user load 1200, and an energy storage device 1300. The energy storage device 1300, as a small energy storage box, can be wall-mounted on an outdoor wall. For example, the power conversion device 1100 can be a photovoltaic panel. The power conversion device 1100 can convert solar energy into electrical energy during periods of low electricity prices. The energy storage device 1300 is used to store this electrical energy and supply it to user loads 1200 such as streetlights and home appliances during peak electricity prices, or to provide power during power outages / power interruptions. In this embodiment, the energy storage device 1300 can be, but is not limited to, a single battery, a battery module, a battery pack, and a battery system. For example, when the energy storage device 1300 is a single battery cell, it can be a cylindrical battery or a prismatic battery.

[0043] Please see Figure 2 and Figure 3 , Figure 2 This is a top view of the energy storage module 2 provided in the first embodiment of this application. Figure 3 for Figure 2 The diagram shows the structure of the energy storage device 1300 in the energy storage module 2.

[0044] For ease of description, the following definitions are provided. Figure 2 The length direction of the energy storage module 2 shown is the X-axis, the width direction is the Y-axis, and the height direction is the Z-axis. The X-axis, Y-axis, and Z-axis are mutually perpendicular. The directional terms such as "upper" and "lower" used in the description of the energy storage module 2 in this application are based on the appendix to the specification. Figure 1 The directions shown are described with "up" referring to the positive direction of the Z-axis and "down" referring to the negative direction of the Z-axis. This does not constitute a limitation on the actual application scenarios of the energy storage module 2.

[0045] The energy storage module 2 includes a housing 1400 and multiple energy storage devices 1300. All energy storage devices 1300 are installed inside the housing 1400. Each energy storage device 1300 includes a housing 100 and an electrode assembly (…). Figure 1 and Figure 2 (Neither shown) and two end cap assemblies 300. The electrode assembly is mounted inside the housing 100. Along the height direction of the energy storage device 1300, i.e. along the Z-axis, the two end cap assemblies 300 are mounted at opposite ends of the housing 100 and are electrically connected to the electrode assembly.

[0046] Specifically, the electrode assembly includes a positive electrode, a negative electrode, and a separator. The positive and negative electrode are spaced apart and arranged opposite to each other, and the separator is located between the positive and negative electrode. For example, the positive electrode, separator, and negative electrode are sequentially stacked and then wound to form the electrode assembly. The tab on the positive electrode is the positive electrode tab, and the tab on the negative electrode is the negative electrode tab.

[0047] The two end cap assemblies 300 are the negative electrode side end cap assembly 300 and the positive electrode side end cap assembly 300, respectively. The negative electrode side end cap assembly 300 includes an end cap, a terminal post, and a current collector. The terminal post passes through the end cap and protrudes relative to the end cap. The current collector is mounted on the side of the end cap opposite to the protruding direction of the negative terminal post and is electrically connected to the terminal post. The positive electrode side end cap assembly 300 includes an end cap and a current collector. The current collector is mounted on one side of the end cap and is electrically connected to the end cap.

[0048] When assembling the energy storage device 1300, the current collector in the negative electrode end cap assembly 300 is welded and fixed to the negative electrode tab in the electrode assembly to achieve electrical connection between the negative electrode end cap assembly 300 and the electrode assembly. The current collector in the positive electrode end cap assembly 300 is welded and fixed to the positive electrode tab in the electrode assembly to achieve electrical connection between the positive electrode end cap assembly 300 and the electrode assembly. The electrode assembly is placed inside the housing 100, the end cap in the negative electrode end cap assembly 300 is closed to the housing 100 and welded to seal the opening of the housing 100, and the end cap in the positive electrode end cap assembly 300 is closed to the housing 100 and welded to seal the opening of the housing 100, thus assembling the energy storage device 1300.

[0049] In the assembled energy storage module 2, multiple energy storage devices 1300 are installed inside the housing 1400. Among them, the end cap assembly 300 on the negative electrode side of each energy storage device 1300 faces the upper end of the housing 1400, that is, the side facing the positive Z-axis, while the end cap assembly 300 on the positive electrode side faces the lower end of the housing 1400, that is, the side facing the negative Z-axis.

[0050] The structure of the end cap assembly 300 on the negative electrode side is similar to that of the end cap assembly 300 on the positive electrode side. The following description will take the structure of the end cap assembly 300 on the positive electrode side as an example.

[0051] See Figure 4 and Figure 5 , Figure 4 for Figure 3 An exploded view of the end cap assembly 300 on the positive electrode side of the energy storage device 1300 shown. Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure of the end cap 10 in the end cap assembly 300 shown.

[0052] The end cap assembly 300 includes an end cap 10, an explosion-proof valve 20, a protective element 21, and a manifold 30. The explosion-proof valve 20 and the manifold 30 are both mounted on the end cap 10.

[0053] In this embodiment, the end cap 10 is a circular sheet. The thickness direction of the end cap 10 is along the Z-axis. For example, the end cap 10 is typically a smooth aluminum sheet. The end cap 10 has a mounting hole 11 and a pressure relief hole 12, both penetrating the end cap 10 along its thickness direction. In this embodiment, the mounting hole 11 is circular and located at the center of the end cap 10. Specifically, the mounting hole 11 includes a first hole portion 111 and a second hole portion 112. The first hole portion 111 faces the collector plate 30. In this embodiment, along the direction from the collector plate 30 to the end cap 10, i.e., along the negative Z-axis direction, the diameter of the first hole portion 111 gradually decreases. The second hole portion 112 communicates with the first hole portion 111. In this embodiment, the diameter of the second hole portion 112 is smaller than the diameter of the first hole portion 111.

[0054] In this embodiment, the pressure relief hole 12 is racetrack-shaped and located at the edge of the end cap 10, spaced apart from the mounting hole 11. The explosion-proof valve 20 is installed on the end cap 10 and covers the pressure relief hole 12 to seal it. Specifically, the explosion-proof valve 20 covers the opening of the pressure relief hole 12 facing the manifold 30. The protective component 21 covers the opening of the pressure relief hole 12 away from the manifold 30, protecting the explosion-proof valve 20 from damage caused by the external environment and external forces.

[0055] See Figure 6 , Figure 6 for Figure 4 A schematic diagram of the structure of the collector plate 30 in the end cap assembly 300 shown.

[0056] The collector plate 30 includes a plate body 31, multiple flanges 32, and bosses 33. The multiple flanges 32 and bosses 33 are all fixedly connected to the plate body 31. The plate body 31, multiple flanges 32, and bosses 33 can be integrally formed.

[0057] Specifically, the disc body 31 is disc-shaped, and its thickness direction is the Z-axis direction. The disc body 31 includes a first surface 301, a second surface 302, and a side surface 303. The first surface 301 and the second surface 302 are arranged opposite to each other along the thickness direction of the disc body 31, and the side surface 303 connects the first surface 301 and the second surface 302. The first surface 301 faces the negative Z-axis direction, i.e., towards the end cover 10. The second surface 302 faces the positive Z-axis direction, i.e., away from the end cover 10.

[0058] The disk body 31 is provided with a welding groove 311 and a vent hole 312. The opening of the welding groove 311 is located on the first surface 301. The welding groove 311 is recessed from the first surface 301 to the second surface 302 and penetrates the side surface 303 of the disk body 31. The bottom wall of the welding groove 311 protrudes relative to the second surface 302 and is welded to the positive electrode tab in the electrode assembly to achieve an electrical connection between the end cap assembly 300 and the electrode assembly. For example, the welding groove 311 can be formed by pressing the disk body 31 downward along the direction from the first surface 301 to the second surface 302, i.e., along the negative Z-axis. In this embodiment, there are multiple welding grooves 311, which are arranged radially and spaced apart from each other along the disk body 31. For example, there are three welding grooves 311, which are evenly arranged radially and spaced apart from each other along the disk body 31. The multiple welding grooves 311 divide the disk body 31 into multiple regions S1, each region S1 being located between two welding grooves 311.

[0059] Vent holes 312 penetrate the disk body 31 along its thickness direction. There are multiple vent holes 312, spaced apart and all spaced apart from the welding groove 311. In this embodiment, the multiple vent holes 312 are evenly distributed in multiple regions S1.

[0060] Multiple flanges 32 are fixedly connected to the side surface 303 of the disk body 31, spaced apart, and protrude relative to the first surface 301. The flanges 32 can abut against the inner surface of the housing 100. For example, the flanges 32 can be integrally formed with the disk body 31 first, and then folded to form the disk body. During thermal runaway or overcharging, pressure will be generated inside the energy storage device 1300, and the disk body 31 may be at risk of flipping under impact. This application addresses this risk by pre-setting flanges 32 on the disk body 31, which abut against the inner surface of the housing 100 to support the end cap 10, thus preventing the disk body 31 from flipping due to impact forces generated during overcharging, depressurization, or other scenarios.

[0061] See also Figure 7 and Figure 8 , Figure 7 for Figure 6 The schematic diagram of the cross-sectional structure of the collector plate 30 shown is as follows. Figure 8 for Figure 7 A partial enlarged view of part A in the schematic diagram of the cross-sectional structure shown.

[0062] A boss 33 is provided on the disk body 31 and protrudes relative to the disk body 31. In this embodiment, the boss 33 is provided on the first surface 301 of the disk body 31 and protrudes relative to the first surface 301. The boss 33 includes a first step 331, a second step 332, and a third step 333. Along the direction away from the disk body 31, the first step 331, the second step 332, and the third step 333 are sequentially provided on the first surface 301 of the disk body 31. In this embodiment, the first step 331, the second step 332, and the third step 333 can be integrally formed. The boss 33 has a rotationally symmetric shape, meaning that the first step 331, the second step 332, and the third step 333 can all be rotationally symmetric structures. The central axis of the boss 33 coincides with the central axis of the disk body 31; that is, the first step 331 is located at the center of the disk body 31, and the central axes of the first step 331, the second step 332, and the third step 333 coincide with the central axis of the disk body 31. In this embodiment, the first step 331 is a cylinder, the second step 332 is a frustum, and the third step 333 is a cylinder. The projection of the second step 332 onto the first step 331 along the axial direction of the collector plate 30 is circular.

[0063] Specifically, a first step 331 is disposed on the first surface 301 of the disk body 31 and protrudes along the positive Z-axis relative to the first surface 301. A second step 332 is disposed on the surface of the first step 331 away from the disk body 31, and the first step 331 protrudes relative to the outer peripheral surface of the second step 332. From the direction away from the first step 331, the angle between the outer peripheral surface of the second step 332 and the surface of the first step 331 away from the disk body 31 is θ, where θ ≥ 90°. In this embodiment, θ > 90°, that is, along the direction away from the first step 331, the diameter of the second step 332 gradually decreases, so that the outer peripheral surface of the second step 332 is inclined. For example, 155° ≤ θ ≤ 175°. The third step 333 is located on the side of the second step 332 away from the first step 331, and the angle between the outer peripheral surface of the third step 333 and the surface of the first step 331 away from the disk body 31 from the second step 332 is α, where α < θ. In this embodiment, α = 90°.

[0064] The manifold 30 also includes a groove 34 and an injection hole 35. The opening of the groove 34 is located on the surface of the first step 331 facing away from the disk body 31. The groove 34 is recessed from the surface of the first step 331 facing away from the disk body 31 towards the disk body 31 and surrounds the second step 332. In this embodiment, the groove 34 is an annular groove, that is, the groove 34 surrounds the second step 332. The term "annular" does not limit the shape of the ring; exemplary annular shapes include circular rings, rectangular square rings, etc. In this embodiment, the groove 34 is an annular groove to match the projected shape of the second step 332 on the first step 331. In other embodiments, the groove 34 can also be a rectangular square ring groove. It is understood that the groove 34 can also include multiple sub-grooves, which surround the second step 332 and are spaced apart. The depth of the groove 34 is D, where 3.2mm ≤ D ≤ 6.88mm. The width of the groove 34 is W1, where 2.4mm ≤ W1 ≤ 4.5mm.

[0065] The injection hole 35 is located on the surface of the boss 33 away from the disk body 31. The injection hole 35 penetrates the disk body 31 and the boss 33 along the thickness direction of the collector disk 30. In this embodiment, the injection hole 35 penetrates the disk body 31, the first step 331, the second step 332 and the third step 333 along the Z-axis direction for injecting electrolyte.

[0066] See also Figure 9 , Figure 9 for Figure 4 The diagram shows a cross-sectional view of the end cap assembly 300.

[0067] During the assembly of the end cap assembly 300, the boss 33 in the collector plate 30 is inserted into the mounting hole 11 of the end cap 10, and the collector plate 30 is welded to the end cap 10 (exemplarily, the welding method is seam welding) to achieve a fixed connection between the collector plate 30 and the end cap 10.

[0068] In the assembled end cap assembly 300, the disc body 31 in the manifold 30 is spaced apart from the end cap 10. At least a portion of the plurality of vent holes 312 are aligned with the pressure relief hole 12, so that at least a portion of the vent holes 312 are aligned with the explosion-proof valve 20. The first step 331 in the boss 33, facing away from the disc body 31, abuts against the surface of the end cap 10 facing the disc body 31, that is, the first step 331 abuts against the surface of the end cap 10 facing the negative Z-axis direction. In this embodiment, the end cap 10 covers the groove 34. The second step 332 and the third step 333 are both located within the mounting hole 11. In this embodiment, the second step 332 extends into the first hole portion 111 of the mounting hole 11 and is spaced apart from the inner circumferential surface of the first hole portion 111. The outer circumferential surface of the second step 332 forms a gap 40 with the inner circumferential surface of the first hole portion 111, the gap 40 being spaced apart from the groove 34 and not communicating with it. The third step 333 extends into the second hole portion 112 of the mounting hole 11, and is spaced apart from the inner circumferential surface of the second hole portion 112, while being exposed relative to the second hole portion 112. This allows the boss 33 to pass through the mounting hole 11 and be exposed relative to the mounting hole 11, facilitating the injection of electrolyte through the injection hole 35 provided on the boss 33. The outer circumferential surface of the third step 333 and the inner circumferential surface of the second hole portion 112 form a gap 50, which communicates with the slit 40.

[0069] In this embodiment of the application, during the assembly of the end cap assembly 300, welding slag is generated during the welding of the collector plate 30 and the end cap 10. By providing a groove 34 in the collector plate 30, the welding slag will fall into the groove 34 along the outer peripheral surface of the second step 332 through the gap 50 and the slit 40, thereby preventing the welding slag from falling into the plate body 31. This prevents the welding slag from contacting the electrode assembly through the vent hole 312 of the plate body 31 and causing a short circuit, thus improving the safety performance of the energy storage device 1300.

[0070] Furthermore, by setting the angle θ between the outer peripheral surface of the second step 332 and the surface of the first step 331 facing away from the disk 31 to be greater than 90°, the outer peripheral surface of the second step 332 forms a slope. This facilitates welding of the collector disk 30 and the end cover 10 by welding along the slope when using laser welding, making welding easier. At the same time, when welding slag falls, it can slide down the slope formed by the outer peripheral surface of the second step 332 into the groove 34, facilitating the removal of welding slag and thus improving the safety performance of the energy storage device 1300.

[0071] Furthermore, by setting a first step 331 and a second step 332 on the disk body 31 of the collector disk 30, and with the first step 331 protruding from the outer peripheral surface of the second step 332, the end cover 10 can abut against the first step 331 when the collector disk 30 is assembled with the end cover 10, so that the end cover 10 and the disk body 31 are spaced apart, the pressure relief hole 12 is connected to the vent hole 312, and the gas generated by the electrode assembly in the energy storage device 1300 can smoothly converge along the vent hole 312 to the pressure relief hole 12 of the end cover 10, thereby facilitating the explosion-proof valve 20.

[0072] When assembling the energy storage module 2, placing the end cap assembly 300 of the energy storage device 1300 at the lower end can prevent electrolyte from entering the groove 34 during the assembly or transportation of the energy storage module 2, thus maintaining a tight seal. This prevents welding slag falling into the groove 34 from being flushed out by the electrolyte and coming into contact with the electrode assembly, causing a short circuit, thereby further improving the safety performance of the energy storage module 2.

[0073] In addition, by setting the angle between the outer peripheral surface of the third step 333 and the surface of the first step 331 that is away from the disk body 31 to be α < θ, the outer peripheral surface of the third step 333 can, to a certain extent, prevent the welding slag in the groove 34 from falling out.

[0074] This application embodiment also provides an electrical device, which includes the above-mentioned energy storage module 2, and the energy storage module 2 is used to supply power to the electrical device.

[0075] See Figure 10 , Figure 10 This is a cross-sectional structural diagram of the end cap assembly 300 provided in the second embodiment of this application.

[0076] The end cap assembly 300 of the second embodiment has the same structure as the end cap assembly 300 of the first embodiment, except that the gap 40 is connected to the groove 34.

[0077] Specifically, the outer peripheral surface of the second step 332 is adjacent to the sidewall of the groove 34 to achieve communication between the gap 40 and the groove 34. The width of the gap 40 is W2, where 1mm ≤ W2 ≤ 3.5mm. The gap 50 is connected to the gap 40, and its width is W3, where 1mm ≤ W3 ≤ 3.5mm. In this embodiment, W3 = W2.

[0078] In the end cap assembly 300 provided in this embodiment, by providing a gap 40 that communicates with the groove 34, the welding slag generated during the welding process between the collector plate 30 and the end cap 10 can fall into the groove 34 through the gap 40. This allows the welding slag to fall into the groove 34 quickly, thus preventing the welding slag from falling into the plate body 31. This prevents the welding slag from short-circuiting with the electrode assembly through the vent hole 312 of the plate body 31, thereby improving the safety performance of the energy storage device 1300.

[0079] When assembling the energy storage module 2, placing the end cap assembly 300 of the energy storage device 1300 at the lower end can prevent electrolyte from entering the groove 34 during the assembly or transportation of the energy storage module 2, thus maintaining a tight seal. This prevents welding slag falling into the groove 34 from being flushed out by the electrolyte and coming into contact with the electrode assembly, causing a short circuit, thereby further improving the safety performance of the energy storage module 2.

[0080] In addition, by setting the angle between the outer peripheral surface of the third step 333 and the surface of the first step 331 that is away from the disk body 31 to be α < θ, the outer peripheral surface of the third step 333 can, to a certain extent, prevent the welding slag in the groove 34 from falling out.

[0081] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A collector disk (30), characterized in that, The device includes a disc body (31) and a boss (33). The boss (33) is disposed on the surface of the disc body (31) and protrudes relative to the disc body (31). The boss (33) includes a first step (331) and a second step (332). The first step (331) is disposed on the surface of the disc body (31) and protrudes relative to the surface of the disc body (31). The second step (332) is disposed on the surface of the first step (331) away from the surface of the disc body (31). The collector plate (30) is provided with a groove (34). The opening of the groove (34) is located on the surface of the first step (331) away from the plate body (31). The groove (34) is recessed from the surface of the first step (331) away from the plate body (31) toward the plate body (31) and is continuously arranged around the second step (332). From the second step (332) in the direction away from the first step (331), the angle between the outer peripheral surface of the second step (332) and the surface of the first step (331) away from the disk body (31) is θ, where θ ≥ 90°.

2. The collector disk (30) according to claim 1, characterized in that, The groove (34) is an annular groove.

3. The collector disk (30) according to claim 2, characterized in that, The projection of the second step (332) onto the first step (331) along the axial direction of the collector plate (30) is circular, and the groove (34) is an annular groove.

4. The collector disk (30) according to any one of claims 1 to 3, characterized in that, The depth of the groove (34) is D, 3.2mm≤D≤6.88mm.

5. The collector disk (30) according to any one of claims 1 to 3, characterized in that, The width of the groove (34) is W1, 2.4mm≤W1≤4.5mm.

6. The collector disk (30) according to claim 1, characterized in that, 155°≤θ≤175°.

7. The collector disk (30) according to claim 1, characterized in that, The boss (33) also includes a third step (333), which is located on the side of the second step (332) away from the first step (331). The angle between the outer peripheral surface of the third step (333) and the surface of the first step (331) away from the disk body (31) is α, where α < θ.

8. The collector disk (30) according to claim 1, characterized in that, The disc body (31) is disc-shaped, and the boss (33) is rotationally symmetrical. The central axis of the boss (33) coincides with the central axis of the disc body (31).

9. An end cap assembly (300), characterized in that, The device includes an end cap (10) and a collector plate (30) as described in any one of claims 1 to 8. The end cap (10) is provided with a mounting hole (11) that penetrates the end cap (10) along the thickness direction. The collector plate (30) is fixedly connected to the end cap (10). The plate body (31) is spaced apart from the end cap (10). The boss (33) passes through the mounting hole (11). The first step (331) abuts against the surface of the end cap (10) facing the plate body (31). The second step (332) is located inside the mounting hole (11).

10. The end cap assembly (300) according to claim 9, characterized in that, The outer peripheral surface of the second step (332) is spaced from the inner peripheral surface of the mounting hole (11) and forms a gap (40).

11. The end cap assembly (300) according to claim 10, characterized in that, The gap (40) is connected to the groove (34).

12. The end cap assembly (300) according to claim 10, characterized in that, The width of the gap (40) is W2, 1mm≤W2≤3.5mm.

13. An energy storage device (1300), characterized in that, It includes a housing (100) and an end cap assembly (300) as claimed in any one of claims 9 to 12, the end cap assembly (300) being mounted on the housing (100).

14. An energy storage module (2), characterized in that, The device includes a housing (1400) and a plurality of energy storage devices (1300) as described in claim 13, wherein the plurality of energy storage devices (1300) are mounted on the inside of the housing (1400), and the end cap assembly (300) in each of the energy storage devices (1300) faces the lower end of the housing (1400).

15. An electrical appliance, characterized in that, The electrical equipment includes the energy storage module (2) as described in claim 14, and the energy storage module (2) supplies power to the electrical equipment.

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