End cap, end cap assembly, energy storage device, and electrical device

Abstract

The application provides an end cover, an end cover assembly, an energy storage device and an electric equipment, which enhances the structural stability of the end cover assembly and improves the safety performance of the energy storage device. The end cover comprises a first surface and a second surface arranged oppositely along the thickness direction of the end cover, and the end cover is provided with a first pole hole and a first liquid injection hole, both of which penetrate through the first surface and the second surface and are arranged apart from each other; the end cover is further provided with a first protrusion, which is arranged on the first surface and located between the first liquid injection hole and the first pole hole, and the first protrusion has a first end surface and a second end surface arranged oppositely along the width direction of the end cover; the projection of the upper insulating piece of the end cover assembly on the first protrusion is at least partially located between the first end surface and the second end surface; the end cover is further provided with a first recess, and the opening of the first recess is located on the second surface; and the first recess is arranged correspondingly with the first protrusion.

Description

Technical Field

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

[0002] As energy storage devices become increasingly widespread, more and more safety issues are emerging, raising concerns about their safety during use. Currently, a common method is to inject electrolyte into the energy storage device using a positive and negative pressure circulation system. However, when the injection nozzle is removed after injection, electrolyte residue remains on the end cap. Over long-term use, this residual electrolyte can corrode the end cap assembly, affecting its structural stability and ultimately impacting the safety performance of the energy storage device. Utility Model Content

[0003] This application provides an end cap, an end cap assembly, an energy storage device, and an electrical device, which enhances the structural stability of the end cap assembly and improves the safety performance of the energy storage device.

[0004] This application provides an end cap for use in an end cap assembly. The end cap includes a first surface and a second surface. Along the thickness direction of the end cap, the first surface and the second surface are disposed opposite to each other. The end cap is provided with a first pole hole and a first injection hole. The first pole hole and the first injection hole both penetrate the first surface and the second surface and are spaced apart from each other.

[0005] The end cap is further provided with a first protrusion, which is disposed on the first surface and located between the first injection hole and the first electrode hole. The first protrusion has a first end face and a second end face. Along the width direction of the end cap, the first end face and the second end face are arranged opposite to each other. The projection of the upper insulating member of the end cap assembly on the first protrusion is at least partially located between the first end face and the second end face. The end cap is further provided with a first groove, the opening of which is located on the second surface. The first groove is correspondingly disposed to the first protrusion.

[0006] Wherein, the projection of the upper insulating member of the end cap assembly onto the first protrusion is located entirely between the first end face and the second end face.

[0007] The end cap further includes a mounting groove with an opening on the first surface. The mounting groove surrounds and communicates with the first electrode hole, and is used to mount the upper insulating component of the end cap assembly. The projection of the mounting groove onto the first protrusion is located between the first end face and the second end face. Furthermore, along the width direction of the end cap, the length of the first protrusion is equal to the width of the end cap.

[0008] Wherein, the first protrusion has a first protrusion surface, and the first protrusion surface is the surface of the first protrusion that is opposite to the first surface;

[0009] The end cap is also provided with a second groove, which is located on the first protrusion, and the opening of the second groove is located on the surface of the first protrusion.

[0010] The first groove has a first groove bottom wall surface, which is disposed opposite to the opening of the first groove.

[0011] The end cap is further provided with a second protrusion, which is disposed on the bottom wall of the first groove and is correspondingly disposed with respect to the second groove. The second groove has a second bottom wall, which is disposed opposite to the opening of the second groove. The second bottom wall is flush with the first surface, or the second bottom wall is located on the side of the first surface closer to the second surface.

[0012] Wherein, along the width direction of the end cap, the ratio between the width dimension of the second groove and the width dimension of the first protrusion is greater than or equal to 0.3 and less than or equal to 0.7.

[0013] Wherein, along the width direction of the end cap, the width dimension of the second groove is greater than or equal to 2mm.

[0014] Wherein, along the width direction of the end cap, the length of the second groove is equal to the width of the end cap.

[0015] There are two first electrode holes, which are located on opposite sides of the first injection hole.

[0016] There are at least two of the first protrusion and the first groove. At least one of the first protrusions is located between a first electrode hole and a first injection hole. Each of the first grooves is correspondingly provided with one of the first protrusions.

[0017] The first protrusion has a first protruding surface, which is the surface of the first protrusion that is away from the first surface, and the distance between the first protruding surface and the first surface is greater than or equal to 0.5 mm.

[0018] The end cap is also provided with an explosion-proof hole, which penetrates the end cap along the thickness direction and is spaced apart from the first injection hole.

[0019] The end cap is also provided with a third protrusion, which is provided on the first surface and located between the explosion-proof hole and the first liquid injection hole. The third protrusion has a third end face and a fourth end face, which are arranged opposite to each other along the width direction of the end cap.

[0020] The projection of the explosion-proof hole on the third protrusion is at least partially located between the third end face and the fourth end face.

[0021] The projection of the explosion-proof hole on the third protrusion is located entirely between the third end face and the fourth end face.

[0022] Wherein, along the width direction of the end cap, the length of the third protrusion is equal to the width of the end cap.

[0023] This application provides an end cap assembly, the end cap assembly including an end cap as described above, an upper insulating member and a pole post, the upper insulating member being installed on the side of the first surface opposite to the second surface, the upper insulating member having a second pole post hole, the second pole post hole penetrating the upper insulating member along the thickness direction of the upper insulating member and communicating with the first pole post hole, the pole post passing through the first pole post hole and the second pole post hole.

[0024] The pole post has a connecting surface located on the side of the first surface away from the second surface. The first protrusion has a first protruding surface, which is the surface of the first protrusion away from the first surface. The first protruding surface is located between the connecting surface and the first surface.

[0025] This application also provides an energy storage device, which includes a housing, a battery cell assembly, and an end cap assembly as described above. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing and contains an electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The battery cell assembly is housed in the receiving cavity. The end cap assembly is mounted on the housing, closes the opening, and is electrically connected to the battery cell assembly.

[0026] This application also provides an electrical device, including the energy storage device described above, which is used to supply power to the electrical device.

[0027] This application improves the safety performance of the energy storage device by providing a first protrusion on the end cap and ensuring that the projection of the upper insulating member on the first protrusion is at least partially located between the first end face and the second end face, thereby preventing electrolyte from flowing to the upper insulating member and avoiding electrolyte corrosion of the upper insulating member. Simultaneously, the end cap also has a first groove, and the first protrusion and the first groove are formed in the same stamping process, which helps to enhance the structural strength of the end cap, making it less prone to deformation and thus improving the product yield of the end cap assembly. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0029] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the energy storage device provided in the embodiments of this application;

[0031] Figure 3 yes Figure 1 A schematic diagram of the end cap assembly of the energy storage device shown;

[0032] Figure 4 yes Figure 3 The exploded view of the end cap assembly is shown.

[0033] Figure 5 yes Figure 3 The diagram shows the structure of the end cap assembly after being cut open along point AA.

[0034] Figure 6 yes Figure 5 An enlarged schematic diagram of region D in the end cap assembly shown;

[0035] Figure 7 yes Figure 3 A schematic diagram of the end cap in the first embodiment of the end cap assembly shown;

[0036] Figure 8 yes Figure 7 The diagram shows a cross-sectional view of the end cap cut along point BB.

[0037] Figure 9 yes Figure 5 A schematic diagram of the structure of the end cap assembly in the second embodiment of the end cap shown;

[0038] Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the end cap cut along the CC line.

[0039] Figure 11 yes Figure 5A schematic diagram of the third embodiment of the end cap in the end cap assembly shown;

[0040] Figure 12 yes Figure 11 The diagram shows a cross-sectional view of the end cap taken along point DD.

[0041] Figure 13 yes Figure 5 A schematic diagram of the fourth embodiment of the end cap in the end cap assembly shown;

[0042] Figure 14 yes Figure 13 The diagram shows a cross-sectional view of the end cap taken along EE.

[0043] Reference numerals: 1. Energy storage system; 2. High-voltage cable; 3. First power conversion device; 4. Second power conversion device; 5. Energy storage device; 1000; 6. Housing; 2000; 7. End cap assembly; 8. Opening; 100; 100; 100; 200; Protective plate; 300; 400; Upper insulating component; 500; Pressure block; 600; Electrode; 700; Sealing ring; 800; First surface; 101; Second surface; 102; 110; First injection hole; 120; First electrode hole; 130; Mounting groove; 140; Third groove bottom wall; 141; First groove side wall; 142; First protrusion; 150; First protrusion surface; 151; First protrusion side; 152; First end face; 152a; Second end face; Surface 152b, first groove 170, first groove bottom wall 171, second groove side wall 172, vent hole 410, second injection hole 420, fourth pole hole 430, second pole hole 510, third pole hole 610, connecting surface 701, second groove 160, second groove bottom wall 161, third groove side wall 162, second protrusion 180, second protrusion surface 181, second protrusion side 182, third protrusion 155, third protrusion surface 156, third protrusion side 157, third end face 157a, fourth end face 157b, fourth groove 158, fourth groove bottom wall 158a, fourth groove side wall 158b, third groove 165, fourth protrusion 190. Detailed Implementation

[0044] 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.

[0045] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form for future applications. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0046] 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 may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. 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.

[0047] Taking electrochemical energy storage as an example, this solution provides an energy storage device for use in energy storage systems. The energy storage device is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage media. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage media. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or transferred to places with a shortage of electricity for use.

[0048] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include:

[0049] (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can assist renewable energy power generation in meeting grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the absorption capacity of renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0050] (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and grid congestion relief. In terms of peak shaving, they can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption.

[0051] (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity charges. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0052] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 1 according to an embodiment of this application, and this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 1000 of this application is not limited to its generation / distribution side energy storage scenario.

[0053] This application provides an energy storage system 1, which includes: a high-voltage cable 2, a first power conversion device 3, a second power conversion device 4, and an energy storage device 1000 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 4 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 1000 through grid connection. The energy storage device 1000 is connected to the high-voltage cable 2 and outputs smooth electricity to supply the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, the wind power conversion device... Always connected to high-voltage cable 2, under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in energy storage device 1000 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in energy storage device 1000 together with high-voltage cable 2 in grid-connected mode to supply power to the power consumption side, providing multiple services such as peak shaving, frequency regulation, and backup for power grid operation, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling of the power grid, and alleviating the power supply pressure of the power grid.

[0054] In some embodiments on the distribution network side, the first power conversion device 3 can be a photovoltaic power conversion device. The energy storage device 1000 is connected to the high-voltage cable 2 and installed downstream of the high-voltage cable 2 between the user load and the user load. The power output by the photovoltaic power conversion device is stored in the energy storage device 1000, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails. Alternatively, it can provide power supply support to alleviate line congestion when the high-voltage cable 2 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0055] Optionally, the first power conversion device may include, but is not limited to, a wind power conversion device, and the second power conversion device may include, but is not limited to, a photovoltaic power conversion device. The first power conversion device 3 and the second power conversion device 4 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0056] Optionally, the energy storage device 1000 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0057] Please see Figure 2 , Figure 2This is a schematic diagram of the structure of the energy storage device 1000 provided in the embodiments of this application.

[0058] This application provides an energy storage device 1000, which may include, but is not limited to, individual battery cells, or battery modules, battery packs, battery clusters, power banks, energy storage cabinets / containers, and other battery integrated systems composed of individual battery cells. Optionally, the individual battery cell can be a rechargeable battery, which refers to a battery cell that can be reactivated by charging after discharge and continue to be used. The individual battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not limit this. The actual application form of the energy storage device 1000 provided in this application embodiment can be, but is not limited to, the listed products, and can also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 1000. This application embodiment only uses a square battery as an example for illustration.

[0059] The energy storage device 1000 includes a housing 2000, a battery cell assembly (not shown), and an end cap assembly 3000. The housing 2000 has a receiving cavity (not shown) and an opening 2001. The receiving cavity is located inside the housing 2000 and contains electrolyte. The opening 2001 is located on the top side of the receiving cavity and communicates with it. The housing 2000 may be made of aluminum; that is, the housing 2000 may be an aluminum shell. The battery cell assembly is housed in the receiving cavity. The battery cell assembly can be immersed in the electrolyte. The end cap assembly 3000 is mounted on the housing 2000, closes the opening 2001, and is electrically connected to the battery cell assembly.

[0060] Please see Figures 3 to 6 , Figure 3 yes Figure 1 A schematic diagram of the end cap assembly 3000 of the energy storage device 1000 shown. Figure 4 yes Figure 3 The diagram shows an exploded view of the end cap assembly 3000. Figure 5 yes Figure 3 The diagram shows the structure of the end cap assembly 3000 after being cut along point AA. Figure 6 yes Figure 5 An enlarged schematic diagram of region D in the end cap assembly 3000 shown.

[0061] The end cap assembly 3000 includes an end cap 100, an explosion-proof valve 200, a protective plate 300, a lower insulator 400, an upper insulator 500, a pressure block 600, an electrode post 700, and a sealing ring 800. The explosion-proof valve 200 and the protective plate 300 are both mounted on the end cap 100. Along the thickness direction of the end cap 100, the lower insulator 400 is mounted on one side of the end cap 100, and the upper insulator 500 is mounted on the side of the end cap 100 away from the lower insulator 400. There are two upper insulators 500. One upper insulator 500 serves as the positive electrode upper insulator, and the other upper insulator 500 serves as the negative electrode upper insulator. The pressure block 600 is mounted on the side of the upper insulator 500 away from the end cap 100. There are two pressure blocks 600. One pressure block 600 serves as the positive electrode pressure block and is mounted on the side of the positive electrode upper insulator away from the end cap 100. Another pressure block 600 is used as a negative electrode pressure block and is installed on the side of the negative electrode insulation away from the end cap 100.

[0062] Along the thickness direction of the end cap assembly 3000, the pole post 700 passes through the lower insulator 400, the end cap 100, the upper insulator 500, and the pressure block 600, and is connected to the pressure block 600. There are two pole posts 700. Along the length direction of the end cap assembly 3000, the two pole posts 700 are arranged at intervals. One pole post 700 serves as the positive pole post, passing through the upper positive insulator and the positive pressure block, and is connected to the positive pressure block. The other pole post 700 serves as the negative pole post, passing through the upper negative insulator and the negative pressure block, and is connected to the negative pressure block. A sealing ring 800 is fitted onto the pole post 700 and clamped between the end cap 100 and the pole post 700. There are two sealing rings 800, each fitted onto one pole post 700 and clamped between the end cap 100 and one pole post 700. One sealing ring 800 serves as a positive electrode sealing ring, and is fitted onto the positive electrode post and clamped between the end cap 100 and the positive electrode post. The other sealing ring 800 serves as a negative electrode sealing ring, and is fitted onto the negative electrode post and clamped between the end cap 100 and the negative electrode post.

[0063] Please see Figure 7 and Figure 8 , Figure 7 yes Figure 3 The diagram shown is a structural schematic of the end cap 100 in the first embodiment of the end cap assembly 3000. Figure 8 yes Figure 7 The diagram shows a cross-sectional view of the end cap cut along point BB.

[0064] In this embodiment, the end cap 100 can be a smooth aluminum sheet made of aluminum. The end cap 100 includes a first surface 101 and a second surface 102. Along the thickness direction of the end cap 100, the first surface 101 and the second surface 102 are disposed opposite to each other.

[0065] The end cap 100 is provided with an explosion-proof hole 110, a first injection hole 120, a first pole hole 130, and a mounting groove 140. Along the thickness direction of the end cap 100, the explosion-proof hole 110, the first injection hole 120, and the first pole hole 130 all penetrate the end cap 100. Specifically, the explosion-proof hole 110, the first injection hole 120, and the first pole hole 130 all penetrate the first surface 101 and the second surface 102, and are spaced apart from each other. Along the length direction of the end cap 100, the explosion-proof hole 110 is located in the middle of the end cap 100. The first injection hole 120 is located on one side of the explosion-proof hole 110, spaced apart from the explosion-proof hole 110, and located on one side of the first pole hole 130.

[0066] The first electrode post hole 130 is located on one side of the explosion-proof hole 110 and on one side of the first liquid injection hole 120, and is spaced apart from both the explosion-proof hole 110 and the first liquid injection hole 120 to allow the electrode post to pass through. There are two first electrode post holes 130, spaced apart. Along the length of the end cap 100, the two first electrode post holes 130 are located on opposite sides of the explosion-proof hole 110 and on opposite sides of the first liquid injection hole 120. Specifically, one first electrode post hole 130 is located on the side of the first liquid injection hole 120 away from the explosion-proof hole 110, for the positive electrode post to pass through. The other first electrode post hole 130 is located on the side of the explosion-proof hole 110 away from the first liquid injection hole 120, for the negative electrode post to pass through.

[0067] The mounting groove 140 is disposed around and communicates with the first pole post hole 130, and is spaced apart from the explosion-proof hole 110 and the first injection hole 120. Specifically, the opening of the mounting groove 140 is located on the first surface 101. The mounting groove 140 is recessed from the first surface 101 toward the second surface 102 and is used to mount the upper insulating member 500 of the end cap assembly 3000. The mounting groove 140 includes a third groove bottom wall surface 141 and a first groove side wall surface 142. The third groove bottom wall surface 141 is disposed opposite to the opening of the mounting groove 140 and is located on the side of the first surface 101 near the second surface 102, and is connected to the hole wall surface of the first pole post hole 130. The first groove side wall surface 142 is disposed around the third groove bottom wall surface 141 and is connected between the third groove bottom wall surface 141 and the first surface 101.

[0068] In this embodiment, there are two mounting slots 140. Along the length of the end cap 100, the two mounting slots 140 are located on opposite sides of the explosion-proof hole 110, with each mounting slot 140 surrounding a first electrode post hole 130. Specifically, one mounting slot 140 is located on the side of the explosion-proof hole 110 away from the first liquid injection hole 120 and surrounds a first electrode post hole 130, and is used to install the insulating component on the positive electrode. The other mounting slot 140 is located on the side of the first liquid injection hole 120 away from the explosion-proof hole 110 and surrounds another first electrode post hole 130, and is used to install the insulating component on the negative electrode.

[0069] The end cap 100 also has a first protrusion 150. The first protrusion 150 is disposed on the first surface 101 and protrudes from the first surface 101 in a direction away from the second surface 102. Along the length of the end cap 100, the first protrusion 150 is located between the mounting groove 140 and the first injection hole 120. The first protrusion 150 has a first protruding surface 151 and a first protruding side surface 152. The first protruding surface 151 is the surface of the first protrusion 150 that faces away from the first surface 101. The first protruding surface 151 is located on the side of the first surface 101 that faces away from the second surface 102. The distance between the first raised surface 151 and the first surface 101 is greater than or equal to 0.5 mm, so as to ensure that when the energy storage device 1000 overflows, the first raised surface 150 can effectively block the electrolyte in the thickness direction of the end cap 100, preventing the electrolyte from overflowing to the first raised surface 151 and thus preventing the electrolyte from reaching the mounting groove 140, thereby improving the safety performance of the energy storage device 1000. The first raised side 152 is arranged around the first raised surface 151 and connects the first raised surface 151 and the first surface 101.

[0070] The first protruding side 152 has a first end face 152a and a second end face 152b. Along the width direction of the end cap 100, the first end face 152a and the second end face 152b are located at opposite ends of the first protrusion 150 and are arranged facing away from each other. The projection of the mounting groove 140 onto the first protrusion 150 is at least partially located between the first end face 152a and the second end face 152b, ensuring that the first protrusion 150 completely covers the mounting groove 140. In the event of electrolyte overflow from the energy storage device 1000, the first protrusion 150 can prevent electrolyte from flowing into the gap between the mounting groove 140 and the upper insulating member 500, thereby preventing electrolyte corrosion of the upper insulating member 500 and improving the safety performance of the energy storage device 1000. It should be noted that the first protrusion 150 also enhances the strength of the end cap 100, making it less prone to deformation and improving its flatness, thereby increasing the product yield of the end cap assembly 3000. In some other embodiments, the length of the first protrusion 150 is equal to the width of the end cap 100 along the width direction of the end cap 100, so as to ensure that the first protrusion 150 can completely block the electrolyte from flowing to the mounting groove 140 and the upper insulating member 500, thereby preventing the electrolyte from corroding the upper insulating member 500 and improving the safety performance of the energy storage device 1000.

[0071] There are at least two first protrusions 150. Along the length of the end cap 100, at least one first protrusion 150 is located between a first electrode post hole 130 and a first injection hole 120. For example, there are two first protrusions 150. One first protrusion 150 is located between a first electrode post hole 130 and a first injection hole 120, and the other first protrusion 150 is located between another first electrode post hole 130 and a first injection hole 120.

[0072] The end cap 100 also has a first groove 170. The opening of the first groove 170 is located on the second surface 102. The first groove 170 is recessed from the second surface 102 toward the first surface 101 and is correspondingly disposed with respect to the first protrusion 150. It should be noted that the first groove 170 correspondingly disposed with respect to the first protrusion 150 means that the projection of the first groove 170 on the first protrusion 150 covers at least a portion of the first protrusion 150. The first groove 170 has a first groove bottom wall surface 171 and a groove side wall surface 172. The first groove bottom wall surface 171 is disposed opposite to the opening of the first groove 170 and is located between the first protrusion surface 151 and the second surface 102. The second groove side wall surface 172 is disposed around the first groove bottom wall surface 171 and connects between the first groove bottom wall surface 171 and the second surface 102, and is spaced apart from the first protrusion side wall surface 152. In this embodiment, the bottom wall surface 171 of the first groove is parallel to the first protruding surface 151, ensuring that the groove wall of the first groove 170 has sufficient structural strength, thereby ensuring that the end cap 100 has good structural strength. There are at least two first grooves 170. At least one first groove 170 is located between a first pole hole 130 and a first injection hole 120. Each first groove 170 is correspondingly provided with a first protrusion 150.

[0073] In this embodiment, the first protrusion 150 and the first groove 170 are formed in the same stamping process to ensure that the end cap 100 has sufficient structural strength, making it less prone to deformation, improving the flatness of the end cap 100, and thus improving the product yield of the end cap assembly 3000. It is understood that during the stamping process of forming the first protrusion 150, the first groove 170 corresponding to the first protrusion 150 will be formed on the end cap 100 at the same time.

[0074] Please continue reading. Figure 5 Along the thickness direction of the end cap assembly 3000, the explosion-proof valve 200 covers the opening of the explosion-proof hole 110 on the second surface 102. The protective plate 300 covers the opening of the explosion-proof hole 110 on the first surface 101 and protects the explosion-proof valve 200.

[0075] Please continue reading. Figure 6The lower insulating member 400 is located on the side of the second surface 102 opposite to the first surface 101. The lower insulating member 400 is provided with a vent 410, a second liquid injection hole 420, and a fourth terminal hole 430. The vent 410, the second liquid injection hole 420, and the fourth terminal hole 430 all penetrate the lower insulating member 400 along its thickness direction. Along the length of the lower insulating member 400, the vent 410 is located in the middle of the lower insulating member 400 and is correspondingly arranged to the explosion-proof hole 110. It should be noted that the correspondence between the vent 410 and the explosion-proof hole 110 means that the projection of the vent 410 on the end cap 100 will cover at least a portion of the explosion-proof hole 110. The second liquid injection hole 420 is located on one side of the vent 410 and is spaced apart from the vent 410, and communicates with the first liquid injection hole 120 to inject electrolyte into the energy storage device 1000. The fourth electrode hole 430 is located on one side of the vent hole 410, and is spaced apart from both the vent hole 410 and the second injection hole 420, and communicates with the first electrode hole 130 to allow the electrode 700 to pass through. There are two fourth electrode holes 430. The two fourth electrode holes 430 are located on opposite sides of the vent hole 410. Specifically, one fourth electrode hole 430 is located on the side of the second injection hole 420 away from the vent hole 410, and communicates with one of the first electrode holes 130 to allow the positive electrode to pass through. The other fourth electrode hole 430 is located on the side of the vent hole 410 away from the fourth electrode hole 430, and communicates with another fourth electrode hole 430 to allow the negative electrode to pass through.

[0076] Each upper insulating component 500 is installed in the mounting groove 140 and has a first pole hole 130. There is a certain gap between the peripheral side of the upper insulating component 500 and the side wall of the first groove 142. It should be noted that after the energy storage device 1000 is filled with electrolyte, some electrolyte will overflow onto the first surface 101 and then enter the gap between the side wall of the first groove 142 and the upper insulating component 500. During prolonged use, the electrolyte in the mounting groove 140 will corrode the upper insulating component 500, thus affecting the safety performance of the end cap assembly 3000. The first protrusion 150 can prevent electrolyte from flowing into the upper insulating component 500, preventing electrolyte corrosion and thus improving the safety performance of the energy storage device 1000.

[0077] Each upper insulating member 500 is provided with a second electrode post hole 510. The second electrode post hole 510 penetrates the upper insulating member 500 along the thickness direction and communicates with a first electrode post hole 130 for the electrode post 700 to pass through. Specifically, the second electrode post hole 510 of the positive electrode upper insulating member communicates with one first electrode post hole 130 for the positive electrode post to pass through, and the second electrode post hole 510 of the negative electrode upper insulating member communicates with another first electrode post hole 130 for the negative electrode post to pass through.

[0078] Each pressure block 600 is mounted on an upper insulating member 500 and is provided with a third electrode post hole 610. The third electrode post hole 610 penetrates the pressure block 600 along its thickness direction and communicates with a second electrode post hole 510 for the electrode post to pass through. Among them, the third electrode post hole 610 of the positive electrode pressure block 600 communicates with another second electrode post hole 510 for the positive electrode post to pass through.

[0079] Along the thickness direction of the end cap assembly 3000, each pole post 700 passes through a fourth pole post hole 430, a first pole post hole 130, a second pole post hole 510, and a third pole post hole 610, and is connected to a pressure block 600. Each pole post 700 has a connecting surface 701. The connecting surface 701 is located on the side of the first surface 101 facing away from the second surface 102. It should be noted that a first protruding surface 151 is located between the connecting surface 701 and the first surface 101 to ensure that there is no interference between different end cap assemblies 3000 when the energy storage devices 1000 are grouped together. Each upper insulating member 500 is clamped between a pole post 700 and an end cap 100, and also between the pressure block 600 and the end cap 100. Each sealing ring 800 passes through a first pole hole 130 and a fourth pole hole 430, and is sandwiched between the second surface 102 of the end cap 100 and the surface of a pole 700 facing the second surface 102. It can not only seal the gap between the end cap 100 and the pole, ensuring the good airtightness of the end cap assembly 3000, but also insulate the end cap 100 and the pole 700.

[0080] In some other embodiments, when the end cap 100 does not have the mounting groove 140, the projection of each upper insulating member 500 on the first protrusion 150 is at least partially located between the first end face 152a and the second end face 152b, ensuring that the first protrusion 150 can partially cover the upper insulating member 500, preventing the electrolyte from corroding the upper insulating member 500. Further, the projection of each upper insulating member 500 on the first protrusion 150 is completely located between the first end face 152a and the second end face 152b, ensuring that the first protrusion 150 can completely cover the upper insulating member 500. In the event of electrolyte overflow from the energy storage device 1000, the first protrusion 150 can completely prevent the electrolyte from flowing to the upper insulating member 500, avoiding electrolyte corrosion of the upper insulating member 500, and further improving the safety performance of the energy storage device 1000.

[0081] Please see Figure 9 and Figure 10 , Figure 9 yes Figure 5 The diagram shows a second embodiment of the end cap 100 in the end cap assembly 3000. Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the end cap 100 cut along CC.

[0082] The difference between this embodiment and the first embodiment is that the end cap 100 also has a second groove 160. The second groove 160 is provided on the first protrusion 150. Specifically, the opening of the second groove 160 is located on the surface 151 of the first protrusion. The second groove 160 is recessed from the surface 151 of the first protrusion towards the first surface 101. The second groove 160 has a second groove bottom wall surface 161 and a third groove side wall surface 162. The second groove bottom wall surface 161 is disposed opposite to the opening of the second groove 160. The third groove side wall surface 162 is disposed around the second groove bottom wall surface 161 and connects the second groove bottom wall surface 161 and the first protrusion surface 151, and is spaced apart from the first protrusion side wall surface 152. The bottom wall 161 of the second tank is flush with the first surface 101, or the bottom wall 161 of the second tank is located on the side of the first surface 101 facing the second surface 102. When the electrolyte overflows to the first protruding surface 151, the second groove 160 can be ensured to have sufficient depth to contain more electrolyte, so as to facilitate the subsequent centralized treatment of the overflowing electrolyte. Along the length direction of the end cap 100, the ratio between the width dimension of the second groove 160 and the width dimension of the first protrusion 150 is greater than or equal to 0.3 and less than or equal to 0.7. Based on the processability, the second groove 160 has sufficient width to contain more electrolyte and facilitates the subsequent cleaning of the electrolyte contained in the second groove 160.

[0083] Specifically, along the length of the end cap 100, the width of the second groove 160 is greater than or equal to 2 mm to ensure that the second groove 160 has sufficient width for easy cleaning of the electrolyte contained within it, preventing electrolyte residue from corroding the second groove 160. Furthermore, when the length of the first protrusion 150 is equal to the width of the end cap 100 along its width, the length of the second groove 160 is equal to the width of the end cap 100. That is, the second groove 160 can penetrate the first end face 152a and the second end face 152b, allowing the electrolyte entering the second groove 160 to flow out from both ends, facilitating subsequent cleaning of the electrolyte within the second groove 160. When the energy storage device 1000 overflows, the second groove 160 allows the electrolyte flowing to the first protruding surface 151 to flow into the second groove 160, further preventing the electrolyte from flowing from the first protruding surface 151 to the upper insulating component 500, thereby preventing corrosion of the upper insulating component 500 and further improving the safety performance of the energy storage device 1000. It should be noted that the third groove sidewall 162 is spaced apart from the first protruding sidewall 152; that is, the second groove 160 has no opening on the first protruding sidewall 152. This ensures that the electrolyte flowing into the second groove 160 will not flow out from the opening and onto the upper insulating component, thereby preventing electrolyte corrosion of the upper insulating component and further improving the safety performance of the energy storage device 1000.

[0084] The end cap 100 also has a second protrusion 180. The second protrusion 180 is disposed on the bottom wall surface 171 of the first groove and protrudes from the bottom wall surface 171 in a direction away from the first protruding surface 151, and is correspondingly disposed with the second groove 160. It should be noted that the second protrusion 180 and the second groove 160 are correspondingly disposed in that the projection of the second groove 160 on the second protrusion 180 covers at least a portion of the second groove 160. The second protrusion 180 has a second protruding surface 181 and a second protruding side surface 182. The second protruding surface 181 is located on the side of the second groove bottom wall surface 161 away from the first protruding surface 151. The second protruding side surface 182 is disposed around the second protruding surface 181 and connects the second protruding surface 181 between the first groove bottom wall surface 171 and is spaced apart from the second groove side surface 172. The second protruding side 182 is parallel to the second groove bottom wall 161 to maintain the thickness of the end cap 100 at the second groove 160, ensuring that the end cap 100 has sufficient structural strength, thereby ensuring that the end cap 100 has good structural strength.

[0085] In this embodiment, the second groove 160 and the second protrusion 180 are formed in the same stamping process to ensure that the end cap 100 has sufficient structural strength, making it less prone to deformation and improving the product yield of the end cap assembly 3000. It is understood that during the stamping process of forming the second groove 160, the second protrusion 180 corresponding to the second groove 160 will be formed on the end cap 100 at the same time.

[0086] Please see Figure 11 and Figure 12 , Figure 11 yes Figure 5 The diagram shows a third embodiment of the end cap 100 in the end cap assembly 3000. Figure 12 yes Figure 11 The diagram shows a cross-sectional view of the end cap 100 cut along DD.

[0087] This embodiment differs from the first embodiment in that the end cap 100 further includes a third protrusion 155. The third protrusion 155 is disposed on the first surface 101 and protrudes from the first surface 101 in a direction away from the second surface 102. The third protrusion 155 is located between the explosion-proof hole 110 and the first injection hole 120. The third protrusion 155 has a third protruding surface 156 and a third protruding side surface 157. The third protruding side surface 157 surrounds the third protruding surface 156 and connects the third protruding surface 156 and the first surface 101. The third protruding side surface 157 includes a third end face 157a and a fourth end face 157b. Along the width direction of the end cap 100, the third end face 157a and the fourth end face 157b are arranged opposite to each other.

[0088] The projection of the explosion-proof hole 110 on the third protrusion 155 is at least partially located between the third end face 157a and the fourth end face 157b, so as to ensure that the third protrusion 155 can block the electrolyte from overflowing from the first injection hole 120 to the explosion-proof valve 200, avoid the electrolyte from corroding the explosion-proof valve 200 and the welded connection between the explosion-proof valve 200 and the end cover 100, improve the connection stability between the end cover 100 and the explosion-proof valve 200, thereby improving the structural stability of the end cover assembly 3000 and the safety performance of the energy storage device 1000. Even better, the projection of the explosion-proof hole 110 on the third protrusion 155 is completely located between the third end face 157a and the fourth end face 157b, ensuring that the third protrusion 155 can completely block the electrolyte from overflowing from the first injection hole 120 to the explosion-proof valve 200, completely avoiding corrosion of the explosion-proof valve 200 and the welded connection between the explosion-proof valve 200 and the end cap 100, further improving the structural stability of the end cap assembly 3000 and the safety performance of the energy storage device 1000. In this embodiment, along the width direction of the end cap 100, the length dimension of the third protrusion 155 is equal to the width dimension of the end cap 100, so that the projection of the explosion-proof valve 200 on the third protrusion 155 is completely located between the third end face 157a and the fourth end face 157b.

[0089] In this embodiment, the end cap 100 also provides a fourth groove 158. The opening of the fourth groove 158 is located on the second surface 102. The fourth groove 158 is recessed from the second surface 102 toward the first surface 101 and is correspondingly disposed with respect to the third protrusion 155. It should be noted that the fourth groove 158 correspondingly disposed with respect to the third protrusion 155 means that the projection of the fourth groove 158 onto the third protrusion 155 covers at least a portion of the third protrusion 155. The fourth groove 158 has a fourth groove bottom wall surface 158a and a fourth groove side wall surface 158b. The fourth groove bottom wall surface 158a is disposed opposite to the opening of the fourth groove 158 and is located between the third protrusion surface 156 and the second surface 102. The fourth groove side wall surface 158b is disposed around the fourth groove bottom wall surface 158a and connects between the fourth groove bottom wall surface 158a and the second surface 102, and is spaced apart from the third protrusion side surface 157.

[0090] In this embodiment, the third protrusion 155 and the fourth groove 158 are formed in the same stamping process to ensure that the end cap 100 has sufficient structural strength, making it less prone to deformation, improving the flatness of the end cap 100, and thus improving the product yield of the end cap assembly 3000. It is understood that during the stamping process of forming the third protrusion 155, the fourth groove 158 corresponding to the third protrusion 155 will be formed simultaneously on the end cap 100.

[0091] Please continue reading. Figure 13 , Figure 13 yes Figure 5The diagram shows a fourth embodiment of the end cap 100 in the end cap assembly 3000. Figure 14 yes Figure 13 The diagram shows a cross-sectional view of the end cap 100 cut along EE.

[0092] The difference between this embodiment and the third embodiment is that the end cap 100 is further provided with a third groove 165. The opening of the third groove 165 is located on the third raised surface 156. The third groove 165 is recessed from the third raised surface 156 toward the second surface 102. The third groove 165 can collect the electrolyte flowing to the third raised surface 156, preventing the electrolyte from flowing to the explosion-proof valve 200, further avoiding electrolyte corrosion of the explosion-proof valve 200 and the connection between the explosion-proof valve 200 and the end cap 100, and further enhancing the stability of the end cap assembly 3000.

[0093] In this embodiment, the end cap 100 is further provided with a fourth protrusion 190. The fourth protrusion 190 is disposed on the bottom wall surface 158a of the fourth groove, and protrudes from the bottom wall surface 158a of the fourth groove in a direction away from the third protrusion surface 156, and is correspondingly disposed with respect to the third groove 165. It should be noted that the corresponding disposal of the fourth protrusion 190 and the third groove 165 means that the projection of the third groove 165 on the fourth protrusion 190 covers at least a portion of the third groove 165.

[0094] In this embodiment, the fourth groove 158 and the fourth protrusion 190 are formed in the same stamping process to ensure that the end cap 100 has sufficient structural strength, making it less prone to deformation and improving the product yield of the end cap assembly 3000. It is understood that during the stamping process of forming the fourth groove 158, the fourth protrusion 190 corresponding to the fourth groove 158 will be formed simultaneously on the end cap 100.

[0095] This application improves the safety performance of the energy storage device 1000 by providing a first protrusion 150 on the end cap 100 and ensuring that the projection of the upper insulating member 500 on the first protrusion 150 is at least partially located between the first end face 152a and the second end face 152b. This prevents electrolyte from flowing to the upper insulating member and avoids electrolyte corrosion, thereby improving the safety performance of the energy storage device 1000. Simultaneously, the end cap 100 is provided with a first groove 170, and the first protrusion 150 and the first groove 170 are formed in the same stamping process, which enhances the structural strength of the end cap 100, making it less prone to deformation and improving the yield of the end cap assembly 3000. Furthermore, the end cap 100 is provided with a second groove 160, allowing electrolyte flowing to the surface 151 of the first protrusion to flow into the second groove 160, preventing electrolyte from flowing through the first protrusion surface 151 to the upper insulating member, thus avoiding electrolyte corrosion and further improving the safety performance of the energy storage device 1000.

[0096] This embodiment also provides an electrical device, such as an energy storage cabinet or a new energy vehicle. This electrical device includes the energy storage device 1000 described in the above embodiment, which supplies power to the electrical device. Since the specific structure and technical effects of the energy storage device 1000 have already been described in detail above, they will not be repeated here. The electrical device provided in this embodiment improves its safety performance by incorporating the aforementioned energy storage device 1000.

[0097] The above descriptions are merely optional embodiments of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this application and are not intended to limit the patent scope of this application. At the same time, for those skilled in the art, equivalent structural transformations made based on the concept of this application and using the specification and drawings of this application, or direct / indirect applications in other related technical fields, all fall within the patent protection scope of this application.

Claims

1. An end cap for use in an end cap assembly, characterized in that, The end cap includes a first surface and a second surface. Along the thickness direction of the end cap, the first surface and the second surface are arranged opposite to each other. The end cap is provided with a first pole hole and a first injection hole. The first pole hole and the first injection hole both penetrate the first surface and the second surface and are spaced apart from each other. The end cap is further provided with a first protrusion, which is disposed on the first surface and located between the first injection hole and the first electrode hole. The first protrusion has a first end face and a second end face. Along the width direction of the end cap, the first end face and the second end face are arranged opposite to each other. The projection of the upper insulating member of the end cap assembly on the first protrusion is at least partially located between the first end face and the second end face. The end cap is further provided with a first groove, the opening of which is located on the second surface. The first groove is correspondingly disposed to the first protrusion.

2. The end cap according to claim 1, characterized in that, The projection of the upper insulating element of the end cap assembly onto the first protrusion lies entirely between the first end face and the second end face.

3. The end cap according to claim 1 or 2, characterized in that, The end cap is also provided with a mounting groove, the opening of which is located on the first surface. The mounting groove surrounds the first pole hole and communicates with it, and is used to install the upper insulating component of the end cap assembly. The projection of the mounting groove on the first protrusion is located between the first end face and the second end face.

4. The end cap according to claim 1 or 2, characterized in that, Along the width direction of the end cap, the length of the first protrusion is equal to the width of the end cap.

5. The end cap according to claim 1 or 2, characterized in that, The first protrusion has a first protrusion surface, which is the surface of the first protrusion that faces away from the first surface; The end cap is also provided with a second groove, which is located on the first protrusion, and the opening of the second groove is located on the surface of the first protrusion.

6. The end cap according to claim 5, characterized in that, The first groove has a first groove bottom wall surface, which is disposed opposite to the opening of the first groove. The end cap is also provided with a second protrusion, which is located on the bottom wall of the first groove and is correspondingly arranged with the second groove.

7. The end cap according to claim 5, characterized in that, The second groove has a second groove bottom wall surface, which is disposed opposite to the opening of the second groove. The second groove bottom wall surface is flush with the first surface, or the second groove bottom wall surface is located on the side of the first surface closer to the second surface.

8. The end cap according to claim 5, characterized in that, Along the width direction of the end cap, the ratio between the width dimension of the second groove and the width dimension of the first protrusion is greater than or equal to 0.3 and less than or equal to 0.

7.

9. The end cap according to claim 5, characterized in that, Along the width direction of the end cap, the width of the second groove is greater than or equal to 2 mm.

10. The end cap according to claim 5, characterized in that, Along the width direction of the end cap, the length of the second groove is equal to the width of the end cap.

11. The end cap according to claim 1 or 2, characterized in that, There are two first electrode holes, which are located on opposite sides of the first injection hole. There are at least two of the first protrusion and the first groove. At least one of the first protrusions is located between a first electrode hole and a first injection hole, and each of the first grooves is correspondingly provided with one of the first protrusions.

12. The end cap according to claim 1 or 2, characterized in that, The first protrusion has a first protruding surface, which is the surface of the first protrusion that faces away from the first surface, and the distance between the first protruding surface and the first surface is greater than or equal to 0.5 mm.

13. The end cap according to claim 1 or 2, characterized in that, The end cap is also provided with an explosion-proof hole, which penetrates the end cap along the thickness direction and is spaced apart from the first injection hole. The end cap is also provided with a third protrusion, which is provided on the first surface and located between the explosion-proof hole and the first liquid injection hole. The third protrusion has a third end face and a fourth end face, which are arranged opposite to each other along the width direction of the end cap. The projection of the explosion-proof hole on the third protrusion is at least partially located between the third end face and the fourth end face.

14. The end cap according to claim 13, characterized in that, The projection of the explosion-proof hole on the third protrusion is located entirely between the third end face and the fourth end face.

15. The end cap according to claim 14, characterized in that, Along the width direction of the end cap, the length of the third protrusion is equal to the width of the end cap.

16. An end cap assembly, characterized in that, The end cap assembly includes an end cap, an upper insulating member, and a pole post as described in any one of claims 1 to 15. The upper insulating member is mounted on the side of the first surface opposite to the second surface. The upper insulating member has a second pole post hole, which penetrates the upper insulating member along the thickness direction and communicates with the first pole post hole. The pole post passes through the first pole post hole and the second pole post hole.

17. The end cap assembly according to claim 16, characterized in that, The pole post has a connecting surface located on the side of the first surface away from the second surface. The first protrusion has a first protruding surface, which is the surface of the first protrusion away from the first surface, and the first protruding surface is located between the connecting surface and the first surface.

18. An energy storage device, characterized in that, The energy storage device includes a housing, a cell assembly, and an end cap assembly as described in claim 16 or 17. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing and contains an electrolyte. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The cell assembly is housed in the receiving cavity. The end cap assembly is mounted on the housing, closes the opening, and is electrically connected to the cell assembly.

19. An electrical appliance, characterized in that, The device includes the energy storage device of claim 18, which is used to supply power to the electrical equipment.

Images