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

Abstract

This application provides a terminal block assembly, an end cap assembly, an energy storage device, and an electrical device to reduce the cost of terminals and improve product competitiveness. The terminal block assembly includes a terminal block, pins, and a conductive element. The pins include a first pin portion and a second pin portion. The first pin portion is fixedly connected to the terminal block, and the second pin portion is fixedly connected to the first pin portion and intersects with the first pin portion. The conductive element is fixedly connected to the second pin portion, and the material of the conductive element is different from the material of the pins.

Description

Technical Field

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

[0002] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. Its recyclable nature has made it a primary power source for electrical devices. As the demand for rechargeable batteries increases, higher requirements are being placed on their energy density, reliability, and cost. Rechargeable batteries often use connecting tabs to achieve electrical connection between the terminals and the cells, which increases manufacturing costs and reduces the product competitiveness of rechargeable batteries. Utility Model Content

[0003] This application provides a terminal block assembly, an end cap assembly, an energy storage device, and an electrical device to reduce the cost of the terminal block and improve product competitiveness.

[0004] In a first aspect, this application provides an electrode assembly, including an electrode, a pin, and a conductive element. The pin includes a first pin portion and a second pin portion. The first pin portion is fixedly connected to the electrode, and the second pin portion is fixedly connected to the first pin portion and intersects with the first pin portion. The conductive element is fixedly connected to the second pin portion, and the material of the conductive element is different from the material of the pin.

[0005] In this application, by combining pins and conductive components made of different materials, the cost of the electrode assembly can be reduced, thereby reducing the cost of the end cap assembly and improving the product competitiveness of the energy storage device.

[0006] In one embodiment, the second pin portion has a first surface, which is a surface along the thickness direction of the second pin portion. The second pin portion is provided with a first mounting groove, the opening of which is located on the first surface. A conductive element is mounted in the first mounting groove. At least a portion of the conductive element reuses the thickness space of the second pin portion, which helps to reduce the volume of the electrode assembly and increase the energy density of the energy storage device.

[0007] In one embodiment, the conductive element is interference-fitted with the first mounting groove to improve the assembly stability between the conductive element and the second pin portion.

[0008] In one embodiment, the first mounting groove has a first groove sidewall, which includes a plurality of straight-edge groove walls and a plurality of first chamfered groove walls. The plurality of straight-edge groove walls are arranged at intervals around the first mounting groove, and each first chamfered groove wall is connected between two adjacent straight-edge groove walls. The conductive component has a first circumferential surface, which includes multiple straight-edge circumferential surfaces and multiple first chamfered circumferential surfaces. The multiple straight-edge circumferential surfaces are arranged at intervals around the conductive component and are arranged opposite to the wall surfaces of the multiple straight-edge grooves. Each first chamfered circumferential surface is connected between two adjacent straight-edge circumferential surfaces and is arranged opposite to a first chamfered groove wall surface.

[0009] This configuration not only avoids stress concentration on the straight-edge groove wall and straight-edge circumference, but also avoids scraping problems during pin and conductive component assembly, ensuring the assembly reliability of the second pole assembly.

[0010] In one embodiment, both the first chamfered groove wall and the first chamfered circumferential surface are circular arc chamfered surfaces, and the chamfer radius of both the first chamfered groove wall and the first chamfered circumferential surface is greater than or equal to 0.5 times the thickness of the second pin portion.

[0011] This configuration not only avoids stress concentration on the straight-edge groove wall and straight-edge circumference, but also avoids scraping problems during pin and conductive component assembly, ensuring the assembly reliability of the second pole assembly.

[0012] In one embodiment, the chamfer radius of the first chamfer groove wall and the chamfer radius of the first chamfer circumferential surface are both greater than or equal to 1 times the thickness of the second pin portion.

[0013] This configuration not only avoids stress concentration on the straight-edge groove wall and straight-edge circumference, but also avoids scraping problems during pin and conductive component assembly, ensuring the assembly reliability of the second pole assembly.

[0014] In one embodiment, the first mounting groove further has a first groove bottom wall surface, which is disposed opposite to the opening of the first mounting groove and connected to the side wall surface of the first groove. The straight edge groove wall surface is an inclined surface, and the size of the projection of the straight edge groove wall surface on the plane where the first groove bottom wall surface is located is greater than or equal to 0.5mm. The conductive component also has a second surface, which is connected to the first circumferential surface and is disposed opposite to the bottom wall of the first groove. The straight edge circumferential surface is an inclined surface, and the size of the projection of the straight edge circumferential surface on the plane where the second surface is located is greater than or equal to 0.5 mm.

[0015] The beveled walls and periphery of the straight-edge slot not only serve as guides for the conductive components to be installed in the first mounting slot, but also prevent incorrect installation. Furthermore, this beveled design facilitates the bonding of pins and conductive components, improving their bonding strength. It also alleviates stress concentration caused by the straight-edge slot walls, preventing scratching issues during pin and component assembly, enhancing the current-carrying capacity of the second electrode assembly, reducing the internal resistance of the energy storage device, and improving its energy efficiency.

[0016] In one embodiment, the dimensions of the projection of the straight-edge groove wall surface onto the plane containing the first groove bottom wall surface and the dimensions of the projection of the straight-edge peripheral surface onto the plane containing the second surface are the same as the thickness of the conductive element.

[0017] The beveled walls and periphery of the straight-edge slot not only serve as guides for the conductive components to be installed in the first mounting slot, but also prevent incorrect installation. Furthermore, this beveled design facilitates the bonding of pins and conductive components, improving their bonding strength. It also alleviates stress concentration caused by the straight-edge slot walls, preventing scratching issues during pin and component assembly, enhancing the current-carrying capacity of the second electrode assembly, reducing the internal resistance of the energy storage device, and improving its energy efficiency.

[0018] In one embodiment, the second pin is made of aluminum and the conductive element is made of copper.

[0019] In this application, aluminum and copper are combined to reduce the cost of the pole assembly, thereby reducing the cost of the end cap assembly and improving the product competitiveness of the energy storage device.

[0020] In one embodiment, the electrode assembly further includes an anti-corrosion layer disposed on the second pin portion to prevent electrochemical corrosion of the second pin portion.

[0021] In one embodiment, the pole and the pin are integrally formed.

[0022] The elimination of soldering between the pins and terminals not only reduces the cost of the terminal assembly and enhances product competitiveness, but also prevents air leakage at the solder joints, improving the reliability of the energy storage device. Furthermore, the integrated structure of the pins and terminals avoids the impact of soldering on current carrying capacity, allows for improved cell efficiency through optimized terminal assembly thickness design, and prevents solder slag from falling into the cell assembly and causing overlap, thus increasing the product yield of the energy storage device.

[0023] In one embodiment, the first pin portion has a third surface, which is a surface in the thickness direction of the first pin portion. The pole includes a first pole portion, which is fixedly connected to the first pin portion. The first pole portion has a second circumferential surface, which includes a first sub-circumferential surface and a second chamfered circumferential surface. The second chamfered circumferential surface is connected between the first sub-circumferential surface and the third surface. The second chamfered circumferential surface is a circular arc chamfered surface, and the chamfer radius of the second chamfered circumferential surface is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0024] The design of the second chamfered circumference avoids the risk of scratching the sealing ring, prevents the terminal post from cutting the sealing ring, or prevents damage to the sealing ring that could lead to a short circuit between the terminal post and the end cap. Furthermore, the small chamfer radius of the second chamfered circumference prevents interference between the sealing ring and the terminal post, ensuring complete bottoming and proper sealing ring assembly. This avoids issues such as misalignment and abnormal compression of the sealing ring, guaranteeing its assembly reliability.

[0025] In one embodiment, the first pole post portion further has a first protruding surface, which is the surface of the first pole post portion that is away from the first pin portion and is connected to the second peripheral surface; The pole also includes a second pole portion, which is fixedly connected to the first protruding surface. The second pole portion has a third circumferential surface, and the orthographic projection of the third circumferential surface on the first pole portion is located inside the second circumferential surface, so as to avoid laser burning of the sealing ring when the second pole portion is welded to the pressure block, and to ensure the reliability of the sealing ring.

[0026] In one embodiment, the second circumferential surface further includes a third chamfered circumferential surface, which is connected between the first sub-circumferential surface and the first protruding surface. The third chamfered circumferential surface is an arc chamfered surface, and the chamfer radius of the third chamfered circumferential surface is less than or equal to 0.5 mm, so as to avoid laser burning of the sealing ring when the second pole part is welded to the pressure block, and to ensure the reliability of the sealing ring.

[0027] In one embodiment, the second pole post further has a second protruding surface, which is the surface of the second pole post that faces away from the first pole post. The third circumferential surface includes a second sub-circumferential surface and a fourth chamfered circumferential surface. The fourth chamfered circumferential surface is connected between the second sub-circumferential surface and the second protruding surface. The fourth chamfered circumferential surface is an arc chamfered surface, and the chamfer radius of the fourth chamfered circumferential surface is less than or equal to 0.5 mm, so as to meet the welding requirements between the second pole post and the first pressure block and ensure the welding reliability between the second pole post and the first pressure block.

[0028] In one embodiment, the first pin portion further has a fourth surface, which is disposed opposite to the third surface; The pole post is provided with a stamping groove, the opening of which faces the same direction as the fourth surface. The diameter of the stamping groove is greater than or equal to twice the thickness of the first pin portion to ensure the stamping feasibility of the stamping groove.

[0029] Secondly, this application provides an end cap assembly for use in an energy storage device, including an end cap, a lower insulating member, any of the above-mentioned pole assembly, an upper insulating member, and a pressure block; The end cap is provided with a first mounting hole, which penetrates the end cap along the thickness direction; Along the thickness direction of the end cap, the lower insulating member is located on one side of the end cap. The lower insulating member is provided with a second mounting hole, which penetrates the lower insulating member along the thickness direction and communicates with the first mounting hole. The upper insulating component is installed on the side of the end cap away from the lower insulating component, and is provided with a third mounting hole. The third mounting hole penetrates the upper insulating component along the thickness direction and communicates with the first mounting hole. The pole is inserted through the first mounting hole, the second mounting hole and the third mounting hole, and the pins and conductive parts are all located on the side of the lower insulating part away from the end cover; The pressure block is installed on the upper insulating component, sleeved on the pole post, and fixedly connected to the pole post.

[0030] In this application, by combining pins and conductive components made of different materials, the cost of the electrode assembly can be reduced, thereby reducing the cost of the end cap assembly and improving the product competitiveness of the energy storage device.

[0031] In one embodiment, the first pin portion is provided with a positioning hole, which penetrates the first pin portion along the thickness direction. The lower insulating component is provided with a positioning post, which is located on the side of the lower insulating component away from the end cover and passes through the positioning hole to achieve effective positioning of the pole post.

[0032] In one embodiment, the positioning hole is located on the side of the pole away from the second pin portion. That is, by placing the positioning hole at a position where no current flows through the first pin portion, the influence of the positioning hole on the pin's overcurrent capability is reduced, ensuring the electrical performance of the end cap assembly.

[0033] Thirdly, this application provides an energy storage device, including a housing, a battery cell assembly, and any of the end cap assemblies mentioned above. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing, and the opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The battery cell assembly is received in the receiving cavity. The end cap assembly is installed on the housing and closes the opening. The second pin portion is electrically connected to the battery cell assembly.

[0034] In one embodiment, the battery cell assembly includes a negative electrode tab, which is electrically connected to a second pin portion, and the material of the negative electrode tab is the same as the material of the conductive element.

[0035] Fourthly, this application provides an electrical device, including an energy storage device, which supplies power to the electrical device. Attached Figure Description

[0036] 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.

[0037] Figure 1a This is a schematic diagram of the structure of the first energy storage system according to an embodiment of this application; Figure 1b This is a schematic diagram of the structure of a second type of energy storage system according to an embodiment of this application; Figure 2This is a schematic diagram of the energy storage device provided in this application; Figure 3 yes Figure 2 The diagram shows the structure of the end cap assembly in the energy storage device. Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure of the end cap assembly after it has been cut open at point II. Figure 5 yes Figure 3 The exploded view of the end cap assembly is shown. Figure 6 yes Figure 5 The diagram shows the structure of the end cap in the end cap assembly. Figure 7 yes Figure 5 The diagram shows the structure of the lower insulating component in the end cap assembly. Figure 8 yes Figure 7 The diagram shows the structure of the lower insulating component from another angle. Figure 9 yes Figure 5 The diagram shows the structure of the upper insulating component in the end cap assembly. Figure 10 yes Figure 5 A schematic diagram of the structure of the first pole post assembly in the end cap assembly shown; Figure 11 yes Figure 10 A schematic diagram of the cross-sectional structure of the first pole post assembly after being cut along point II-II; Figure 12 yes Figure 3 A partial structural diagram of the end cap assembly shown from another angle; Figure 13 yes Figure 11 A schematic diagram of the structure of region A in the first pole post assembly shown; Figure 14 yes Figure 5 The diagram shows the structure of the second pole post assembly in the end cap assembly. Figure 15 yes Figure 14 A schematic diagram of the cross-sectional structure of the second pole assembly after it is cut along point III-III; Figure 16 yes Figure 15 A schematic diagram of the structure of region B in the second pole assembly shown; Figure 17 yes Figure 14 The diagram shows the structure of the pole and pin in the second pole assembly at another angle. Figure 18 yes Figure 17 A schematic diagram of the structure of region C in the second pole post assembly shown; Figure 19 yes Figure 14 A schematic diagram of the conductive component in the second pole assembly at another angle; Figure 20 yes Figure 19 The diagram shows the structure of region D in the second pole assembly.

[0038] The names corresponding to the labels in the figure are: Energy storage system 400, high-voltage cable 410, first power conversion device 420, second power conversion device 430, energy storage device 100, photovoltaic-energy storage-charging station 460, automobile 470, housing 110, end cap assembly 120, end cap 10, explosion-proof valve 20, protective plate 30, lower insulating component 40, upper insulating component 50, pole post assembly 60, pressure block 70, sealing ring 80, limiting component 90, first upper insulating component 51, second upper insulating component 52, first pole post assembly 61, second pole post assembly 62, first pressure block 71, second... Pressure block 72, first sealing ring 81, second sealing ring 82, first limiting member 91, second limiting member 92, first mounting surface 101, second mounting surface 102, explosion-proof hole 103, first mounting hole 104, first limiting hole 105, explosion-proof fence 41, third mounting surface 401, fourth mounting surface 402, second mounting hole 403, second mounting groove 404, positioning post 42, fifth mounting surface 501, sixth mounting surface 502, third mounting hole 503, third mounting groove 504, second limiting hole 505, pole post 63. Pin 64, first pin portion 641, second pin portion 642, third surface 643, fourth surface 644, positioning hole 645, first surface 646, fifth surface 647, first included angle θ1, first pole portion 631, second pole portion 632, first protruding surface 633, second circumferential surface 634, first sub-circumferential surface 6341, second chamfered circumferential surface 6342, third chamfered circumferential surface 6343, second included angle θ2, second protruding surface 635, third circumferential surface 636, second sub-circumferential surface 6361, fourth chamfered circumferential surface 63 62, stamping groove 637, second groove bottom wall 6371, second groove side wall 6372, first sub-groove wall 6373, second chamfered groove wall 6374, third chamfered groove wall 6375, conductive component 65, first mounting groove 648, first groove bottom wall 6481, first groove side wall 6482, straight edge groove wall 6483, first chamfered groove wall 6484, second surface 651, sixth surface 652, first peripheral surface 653, straight edge peripheral surface 6531, first chamfered peripheral surface 6532 and third limiting hole 701. Detailed Implementation

[0039] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0040] 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. 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.

[0041] 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.

[0042] 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: (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can help renewable energy power generation meet 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. (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and relief of grid congestion. 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. (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 costs. 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.

[0043] In some embodiments, see Figure 1a , Figure 1a This is a schematic diagram of the structure of the first energy storage system 400 according to an embodiment of this application, and this application Figure 1a The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 100 of this application is not limited to its generation / distribution side energy storage scenario.

[0044] This application provides a first type of energy storage system 400, which includes: a high-voltage cable 410, a first power conversion device 420, a second power conversion device 430, and an energy storage device 100 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 430 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 100 through grid connection. The energy storage device 100 is connected to the high-voltage cable 410 and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, wind power... The energy conversion device is always connected to the high-voltage cable 410. 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 the energy storage device 100 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 the energy storage device 100 together with the high-voltage cable 410 in grid-connected mode to supply power to the power consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0045] In some embodiments on the distribution network side, the first power conversion device 420 can be a photovoltaic power conversion device. The energy storage device 100 is connected to the high-voltage cable 410 and installed downstream of the high-voltage cable 410 between the user load and the user load. The power output by the photovoltaic power conversion device is stored in the energy storage device 100, 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 410 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.

[0046] 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 420 and the second power conversion device 430 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0047] Optionally, the energy storage device 100 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.

[0048] Optionally, the energy storage device 100 may include, but is not limited to, single-cell batteries, or battery modules, battery packs, battery clusters, power banks, energy storage cabinets / containers, and other battery integrated systems composed of single-cell batteries. The actual application form of the energy storage device 100 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 100. This application embodiment only uses a multi-cell battery as an example for illustration.

[0049] In some embodiments, see Figure 1b , Figure 1b This is a schematic diagram of the structure of the second type of energy storage system 400 according to an embodiment of this application, and this application Figure 1b The embodiments are illustrated using industrial and commercial energy storage scenarios as an example. The energy storage device 100 of this application is not limited to energy storage scenarios on the power generation / distribution side.

[0050] This application provides a second type of energy storage system 400, which includes: an energy storage device 100, a high-voltage cable 410, a factory equipped with a first power conversion device 420, a photovoltaic-energy storage-charging station 460, and a vehicle 470. In some embodiments of industrial and commercial scenarios, the first power conversion device 420 can be a photovoltaic panel, which converts solar energy into electrical energy and stores it in the energy storage device 100 in the factory. In the event of a power grid failure, the energy storage device 100 provides power to ensure the safe and stable operation of the factory without interruption. Alternatively, when the factory's power load is high, the power grid issues an instruction to transmit the electricity stored in the energy storage device 100 in conjunction with the high-voltage cable 410 in a grid-connected mode to supply the factory with electricity, providing various services such as peak shaving / frequency regulation and backup for the power grid operation. In addition, the first power conversion device 420 can also convert solar energy into electrical energy and store it in the energy storage device 100 of the photovoltaic-energy storage-charging station 460, which can directly charge the vehicle 470, making it fast and convenient.

[0051] Optionally, the first power conversion device 420 may include, but is not limited to, photovoltaic panels and wind power conversion devices, and the first power conversion device 420 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0052] Please see Figure 2 , Figure 2 This is a schematic diagram of the energy storage device 100 provided in this application.

[0053] This application provides an energy storage device 100, which may include, but is not limited to, a single battery cell, a battery module, a battery pack, or a battery system. Optionally, when the energy storage device 100 is a single battery cell, it may be, but is not limited to, at least one of cylindrical, prismatic, prismatic, or other shaped batteries. The single battery cell may be a rechargeable battery, which is a battery that can be reactivated by charging after discharge to continue its use. The single battery cell may 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, or lead-acid battery, etc., and this application does not specifically limit its application. It should be noted that the actual application form of the energy storage device 100 provided in this application may be, but is not limited to, the listed products, and may also be other application forms. This application does not strictly limit the application form of the energy storage device 100. This application uses a prismatic battery as an example for illustration.

[0054] The energy storage device 100 includes a housing 110, a battery cell assembly (not shown), an end cap assembly 120, and an insulating film (not shown). The housing 110 has a receiving cavity (not shown) and an opening (not shown). The receiving cavity is located inside the housing 110 and contains an electrolyte. The opening is located on the top side of the receiving cavity and communicates with it. The housing 110 may be made of aluminum; for example, the housing 110 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 battery cell assembly includes a positive electrode tab and a negative electrode tab. The end cap assembly 120 is mounted on the housing 110, closes the opening, and is electrically connected to the battery cell assembly. The end cap assembly 120 is electrically connected to both the positive and negative electrode tabs.

[0055] The length direction of the end cap assembly 120 is parallel to the length direction of the energy storage device 100, the width direction of the end cap assembly 120 is parallel to the width direction of the energy storage device 100, and the thickness direction of the end cap assembly 120 is parallel to the height direction of the energy storage device 100.

[0056] Please see Figures 3 to 5 , Figure 3 yes Figure 2 The diagram shows the structure of the end cap assembly 120 in the energy storage device 100. Figure 4 yes Figure 3 The diagram shows a partial cross-sectional view of the end cap assembly 120 after it has been cut along point II. Figure 5 yes Figure 3 The diagram shows an exploded view of the end cap assembly 120. The phrase "cut along II" refers to cutting along the plane containing line II; similar descriptions in the following text can be understood in the same way.

[0057] The end cap assembly 120 includes an end cap 10, an explosion-proof valve 20, a protective plate 30, a lower insulating member 40, an upper insulating member 50, a pole assembly 60, a pressure block 70, a sealing ring 80, and a limiting member 90. The explosion-proof valve 20 and the protective plate 30 are both mounted on the end cap 10. Along the thickness direction of the end cap 10, the lower insulating member 40 is located on one side of the end cap 10. The upper insulating member 50 is mounted on the side of the end cap 10 opposite to the lower insulating member 40. There are two upper insulating members 50, namely a first upper insulating member 51 and a second upper insulating member 52. Along the length direction of the end cap assembly 120, the first upper insulating member 51 and the second upper insulating member 52 are arranged at intervals.

[0058] Along the thickness direction of the end cap assembly 120, the pole of the pole assembly 60 passes through the end cap 10, the lower insulating member 40, and the upper insulating member 50. There are two pole assemblies 60: a first pole assembly 61 and a second pole assembly 62. The pole of the first pole assembly 61 passes through the end cap 10, the lower insulating member 40, and the first upper insulating member 51. The pole of the second pole assembly 62 passes through the end cap 10, the lower insulating member 40, and the second upper insulating member 52. In this embodiment, the first pole assembly 61 is used as a positive pole assembly, and the second pole assembly 62 is used as a negative pole assembly.

[0059] A pressure block 70 is installed on the upper insulating member 50 and sleeved on the pole post assembly 60, and is fixedly connected to the pole post assembly 60. There are two pressure blocks 70: a first pressure block 71 and a second pressure block 72. The first pressure block 71 is installed on the first upper insulating member 51 and sleeved on the pole post of the first pole post assembly 61, and is fixedly connected to the pole post of the first pole post assembly 61. The second pressure block 72 is installed on the second upper insulating member 52 and sleeved on the pole post of the second pole post assembly 62, and is fixedly connected to the pole post of the second pole post assembly 62.

[0060] A sealing ring 80 is fitted onto the pole of the pole assembly 60 and clamped between the end cap 10 and the pole of the pole assembly 60. There are two sealing rings 80: a first sealing ring 81 and a second sealing ring 82. The first sealing ring 81 is fitted onto the pole of the first pole assembly 61 and clamped between the end cap 10 and the pole of the first pole assembly 61. The second sealing ring 82 is fitted onto the pole of the second pole assembly 62 and clamped between the end cap 10 and the pole of the second pole assembly 62.

[0061] A limiting member 90 passes through the upper insulating member 50 and is located between the end cap 10 and the pressure block 70. There are multiple limiting members 90, including multiple first limiting members 91 and multiple second limiting members 92. The multiple first limiting members 91 pass through the first upper insulating member 51 and are located between the end cap 10 and the first pressure block 71, and are spaced apart around the poles of the first pole assembly 61. The multiple second limiting members 92 pass through the second upper insulating member 52 and are located between the end cap 10 and the second pressure block 72, and are spaced apart around the poles of the second pole assembly 62.

[0062] Please refer to the following: Figure 6 , Figure 6 yes Figure 5 The diagram shows the structure of the end cap 10 in the end cap assembly 120.

[0063] The end cap 10 has a first mounting surface 101 and a second mounting surface 102. Along the thickness direction of the end cap 10, the first mounting surface 101 and the second mounting surface 102 are arranged opposite to each other. The end cap 10 is provided with an explosion-proof hole 103, a first mounting hole 104, and a first limiting hole 105. Both the explosion-proof hole 103 and the first mounting hole 104 penetrate the end cap 10 along its thickness direction. That is, both the explosion-proof hole 103 and the first mounting hole 104 penetrate the first mounting surface 101 and the second mounting surface 102 along the thickness direction of the end cap 10, and are spaced apart from each other. Along the length direction of the end cap 10, the explosion-proof hole 103 is located in the middle of the end cap 10. There are two first mounting holes 104, located on opposite sides of the explosion-proof hole 103 along the length direction of the end cap 10. The first limiting hole 105 is located around the first mounting hole 104 and is spaced apart from it. The opening of the first limiting hole 105 is located on the first mounting surface 101. There are multiple first limiting holes 105, which are spaced apart around the first mounting hole 104. For example, there are six first limiting holes 105. Every three first limiting holes 105 are spaced apart around one first mounting hole 104.

[0064] Both the explosion-proof valve 20 and the protective plate 30 cover the explosion-proof hole 103. Specifically, the explosion-proof valve 20 covers the opening of the explosion-proof hole 103 facing the lower insulating member 40. The protective plate 30 covers the opening of the explosion-proof hole 103 facing away from the lower insulating member 40 to protect the explosion-proof valve 20. In the event of thermal runaway of the energy storage device 100, the explosion-proof valve 20 will open, and the high-temperature gas inside the energy storage device 100 will be ejected from the explosion-proof hole 103 to prevent the energy storage device 100 from exploding and to ensure the reliability of the energy storage device 100.

[0065] Please refer to the following: Figure 7 and Figure 8 , Figure 7 yes Figure 5 The diagram shows the structure of the lower insulating member 40 in the end cap assembly 120. Figure 8 yes Figure 7 The diagram shows the structure of the lower insulating element 40 at another angle.

[0066] The lower insulating member 40 is located on the side of the second mounting surface 102 opposite to the first mounting surface 101. The lower insulating member 40 has an explosion-proof barrier 41, which is located in the middle of the lower insulating member 40 along its length and is correspondingly arranged with the explosion-proof valve 20. When the energy storage device 100 experiences thermal runaway, the high-temperature gas inside the energy storage device 100 will reach the explosion-proof valve 20 through the explosion-proof barrier 41. After the explosion-proof valve 20 opens, the gas will be ejected through the explosion-proof hole 103 to ensure the reliability of the energy storage device 100.

[0067] The lower insulating member 40 has a third mounting surface 401 and a fourth mounting surface 402. The third mounting surface 401 is the surface of the lower insulating member 40 facing the end cover 10. The fourth mounting surface 402 is disposed opposite to the third mounting surface 401. The lower insulating member 40 is provided with a second mounting hole 403 and a second mounting groove 404. The second mounting hole 403 penetrates the lower insulating member 40 along its thickness direction. That is, the second mounting hole 403 penetrates both the third mounting surface 401 and the fourth mounting surface 402 along the thickness direction of the lower insulating member 40. The second mounting hole 403 communicates with the first mounting hole 104. There are two second mounting holes 403. Along the length direction of the lower insulating member 40, the two second mounting holes 403 are located on opposite sides of the explosion-proof fence 41 and communicate with the two first mounting holes 104 respectively.

[0068] The opening of the second mounting groove 404 is located on the fourth mounting surface 402. The second mounting groove 404 is recessed from the fourth mounting surface 402 toward the third mounting surface 401 and communicates with the second mounting hole 403. There are two second mounting grooves 404. Along the length of the lower insulating member 40, the two second mounting grooves 404 are located on opposite sides of the explosion-proof fence 41 and communicate with the two second mounting holes 403 respectively.

[0069] In addition, the lower insulating member 40 is also provided with positioning posts 42, which are located on the side of the lower insulating member 40 away from the end cover 10. Specifically, the positioning posts 42 are located on the bottom wall of the second mounting groove 404 and on the side of the second mounting hole 403 facing the explosion-proof fence 41. There are multiple positioning posts 42, which are spaced apart around the second mounting hole 403. For example, there are four positioning posts 42, with every two positioning posts 42 located on the bottom wall of one second mounting groove 404 and arranged around one second mounting hole 403, and distributed along the width direction of the lower insulating member 40.

[0070] Please refer to the following: Figure 9 , Figure 9 yes Figure 5A schematic diagram of the structure of the upper insulating member 50 in the end cap assembly 120 shown.

[0071] Each upper insulating member 50 is mounted on the side of the first mounting surface 101 facing away from the second mounting surface 102. Each upper insulating member 50 has a fifth mounting surface 501 and a sixth mounting surface 502. The fifth mounting surface 501 is the surface of the upper insulating member 50 facing away from the end cover 10. The sixth mounting surface 502 is disposed opposite to the fifth mounting surface 501. The upper insulating member 50 is provided with a third mounting hole 503, a third mounting groove 504, and a second limiting hole 505. The third mounting hole 503 penetrates the upper insulating member 50 along the thickness direction. That is, the third mounting hole 503 penetrates the fifth mounting surface 501 and the sixth mounting surface 502 along the thickness direction of the upper insulating member 50. The third mounting hole 503 communicates with the first mounting hole 104. The third mounting holes 503 of the two upper insulating members 50 are respectively connected to the two first mounting holes 104. The opening of the third mounting groove 504 is located on the fifth mounting surface 501. The third mounting groove 504 is recessed from the fifth mounting surface 501 toward the sixth mounting surface 502 and extends through the third mounting hole 503.

[0072] The second limiting hole 505 is located around the third mounting hole 503 and is spaced apart from the third mounting hole 503. The second limiting hole 505 penetrates the bottom wall of the third mounting groove 504 and the sixth mounting surface 502, and communicates with the first limiting hole 105. There are multiple second limiting holes 505, which are spaced apart around the third mounting hole 503 and communicate with each of the multiple first limiting holes 105. For example, each upper insulating member 50 has three second limiting holes 505.

[0073] Please refer to the following: Figure 10 and Figure 11 , Figure 10 yes Figure 5 The diagram shows the structure of the first pole post assembly 61 in the end cap assembly 120. Figure 11 yes Figure 10 The diagram shows a cross-sectional view of the first pole post assembly 61 after it is cut along line II-II.

[0074] The first terminal assembly 61 includes a terminal 63 and a pin 64. The terminal 63 passes through the second mounting hole 403 of the lower insulator 40, the first mounting hole 104 of the end cap 10, and the third mounting hole 503 of the first upper insulator 51. The pin 64 is located on the side of the lower insulator 40 opposite to the end cap 10, and is fixedly connected to the terminal 63 and electrically connected to the cell assembly. The terminal 63 serves as the positive terminal, and the pin 64 serves as the positive pin and is electrically connected to the positive tab of the cell assembly.

[0075] In this embodiment, the pin 64 and the terminal post 63 are integrally formed. Both the pin 64 and the terminal post 63 can be made of aluminum. The pin 64 and the terminal post 63 do not need to be connected by welding, which not only reduces the cost of the first terminal post assembly 61 and improves product competitiveness, but also avoids air leakage at the weld between the pin 64 and the terminal post 63, improving the reliability of the energy storage device 100. Furthermore, the integrated structure of the pin 64 and the terminal post 63 not only prevents the welding effect from affecting the current carrying capacity, but also allows for improved energy efficiency of the battery cell assembly by rationally designing the thickness of the first terminal post assembly 61. It also prevents weld slag from falling into the battery cell assembly and causing overlap, thus improving the product yield of the energy storage device 100.

[0076] The pin 64 includes a first pin portion 641 and a second pin portion 642. The first pin portion 641 is fixedly connected to the electrode post 63. The second pin portion 642 is fixedly connected to the first pin portion 641, intersects with the first pin portion 641, and is electrically connected to the cell assembly. The first pin portion 641 has a third surface 643 and a fourth surface 644, both of which are surfaces along the thickness direction of the first pin portion 641. Along the thickness direction of the first pin portion 641, the third surface 643 and the fourth surface 644 are arranged opposite to each other. The first pin portion 641 is in the shape of a planar plate, and its thickness can be 3 mm.

[0077] Please refer to the following: Figure 12 , Figure 12 yes Figure 3 A partial structural schematic diagram of the end cap assembly 120 shown from another angle.

[0078] The first pin portion 641 is mounted in the second mounting groove 404 of the lower insulating member 40. The first pin portion 641 has a positioning hole 645 that penetrates the first pin portion 641 along its thickness direction. That is, the positioning hole 645 penetrates the third surface 643 and the fourth surface 644 along the thickness direction of the first pin portion 641. The positioning hole 645 also penetrates the circumferential surface of the first pin portion 641. For example, the positioning hole 645 can be a circular hole with a radius greater than or equal to 2 mm. The positioning post 42 of the lower insulating member 40 passes through the positioning hole 645 to achieve effective positioning of the pole post 63. There are multiple positioning holes 645, spaced apart, and the multiple positioning posts 42 of the lower insulating member 40 pass through each of the multiple positioning holes 645 to ensure positioning effectiveness. For example, there are two positioning holes 645. Furthermore, the positioning hole 645 is located at the end of the pole post 63 opposite to the second pin portion 642. That is, the positioning hole 645 is set at a position where no current flows through the first pin portion 641, thereby reducing the impact of the positioning hole 645 on the overcurrent capability of the pin 64 and ensuring the electrical performance of the end cover assembly 120.

[0079] The second pin portion 642 has a first surface 646 and a fifth surface 647, both of which are surfaces along the thickness direction of the second pin portion 642. The first surface 646 is connected to the third surface 643. The fifth surface 647 is disposed opposite to the first surface 646 and is connected to the fourth surface 644. The included angle between the first pin portion 641 and the second pin portion 642 is a first included angle θ1, which is greater than 0 degrees and less than 180 degrees. For example, the first included angle θ1 is 90 degrees. The second pin portion 642 is in the shape of a planar plate, and its thickness can be 3 mm.

[0080] Please refer to the following: Figure 13 , Figure 13 yes Figure 11 The diagram shows the structure of region A in the first pole post assembly 61.

[0081] The electrode post 63 includes a first electrode post portion 631 and a second electrode post portion 632. The first electrode post portion 631 is fixedly connected to the first pin portion 641, and the second electrode post portion 632 is fixedly connected to the side of the first electrode post 631 opposite to the first pin portion 641 and is fixedly connected to the first pressure block 71. The first electrode post portion 631 has a first protruding surface 633 and a second circumferential surface 634. The first protruding surface 633 is the surface of the first electrode post portion 631 opposite to the first pin portion 641. The second circumferential surface 634 is disposed around the first electrode post portion 631 and connects the first protruding surface 633 and the third surface 643. The second circumferential surface 634 includes a first sub-circumferential surface 6341, a second chamfered circumferential surface 6342, and a third chamfered circumferential surface 6343. The included angle between the first sub-circumferential surface 6341 and the third surface 643 is a second included angle θ2, which is greater than or equal to 85 degrees and less than or equal to 90 degrees. Under this setting, the draft angle of the first pole post assembly 61 is the second included angle θ2, which not only ensures the demolding of the first pole post assembly 61, but also does not affect the assembly of the first pole post assembly 61 with the end cap 10.

[0082] The second chamfered circumferential surface 6342 connects the first sub-circumferential surface 6341 and the third surface 643. The second chamfered circumferential surface 6342 is a rounded chamfered surface, and its chamfer radius r1 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. The design of the second chamfered circumferential surface 6342 avoids the risk of scratching the first sealing ring 81, prevents the pole post 63 from cutting the first sealing ring 81, or prevents damage to the first sealing ring 81 that could lead to a short circuit between the pole post 63 and the end cap 10. Furthermore, the small chamfer radius r1 of the second chamfered circumferential surface 6342 prevents interference between the first sealing ring 81 and the pole post 63, which could prevent the first sealing ring 81 from being fully seated and thus avoids problems such as assembly misalignment and abnormal compression of the first sealing ring 81, ensuring the assembly reliability of the first sealing ring 81.

[0083] The third chamfered circumferential surface 6343 connects the first sub-circumferential surface 6341 and the first protruding surface 633. The third chamfered circumferential surface 6343 is a rounded chamfered surface, and its chamfer radius r2 is greater than or equal to less than or equal to 0.5 mm. This is to prevent laser burns to the first sealing ring 81 during welding of the second pole post 632 to the first pressure block 71, ensuring the reliability of the first sealing ring 81.

[0084] The second pole post 632 is fixedly connected to the first protruding surface 633. The second pole post 632 has a second protruding surface 635 and a third circumferential surface 636. The second protruding surface 635 is the surface of the second pole post 632 facing away from the first pole post 631. The third circumferential surface 636 is disposed around the second pole post 632 and is connected between the second protruding surface 635 and the first protruding surface 633. The orthographic projection of the third circumferential surface 636 on the first pole post 631 is located inside the second circumferential surface 634. That is, the orthographic projection of the second circumferential surface 634 on the second pole post 632 is disposed around the third circumferential surface 636. For example, both the second circumferential surface 634 and the third circumferential surface 636 are cylindrical surfaces, and the radius of the second circumferential surface 634 is larger than the radius of the third circumferential surface 636. At this time, the pole post 63 is designed in a stepped shape. The first protruding surface 633 can block the laser when the second pole post 632 is welded to the first pressure block 71, so as to avoid the laser burning the first sealing ring 81 and ensure the reliability of the first sealing ring 81.

[0085] The third circumferential surface 636 includes a second sub-circumferential surface 6361 and a fourth chamfered circumferential surface 6362. The second sub-circumferential surface 6361 is connected to the first protruding surface 633. The fourth chamfered circumferential surface 6362 is connected between the second sub-circumferential surface 6361 and the second protruding surface 635. The fourth chamfered circumferential surface 6362 is a rounded chamfer surface, and its chamfer radius r3 is less than or equal to 0.5 mm to meet the welding requirements between the second pole post 632 and the first pressure block 71, ensuring the reliability of the welding between them.

[0086] Furthermore, the pole post 63 is provided with a stamping groove 637, the opening of which faces the same direction as the fourth surface 644. For example, the stamping groove 637 can be formed by a stamping process. The stamping groove 637 is a circular groove, and its diameter is greater than or equal to twice the thickness of the first pin portion 641 to ensure the stamping feasibility of the groove 637. The stamping groove 637 has a second groove bottom wall surface 6371 and a second groove side wall surface 6372. The second groove bottom wall surface 6371 is disposed opposite to the opening of the stamping groove 637 and opposite to the second protruding surface 635. The distance between the second groove bottom wall surface 6371 and the second protruding surface 635 is less than the thickness of the first pin portion 641 to ensure the chamfer radius r3 of the fourth chamfered peripheral surface 6362. That is, in order to ensure the chamfer radius r3 of the fourth chamfer circumferential surface 6362, it is necessary to extrude material between the second groove bottom wall surface 6371 and the second protruding surface 635. The distance between the second groove bottom wall surface 6371 and the second protruding surface 635 can be greater than or equal to 2.5 mm and less than or equal to 2.9 mm.

[0087] The second groove sidewall 6372 is disposed around the stamping groove 637 and connects between the second groove bottom wall 6371 and the fourth surface 644. The second groove sidewall 6372 includes a first sub-groove wall 6373, a second chamfered groove wall 6374, and a third chamfered groove wall 6375. The first sub-groove wall 6373 is disposed opposite to the first sub-peripheral surface 6341, and the distance between the first sub-groove wall 6373 and the first sub-peripheral surface 6341 is less than the thickness of the first pin portion 641 to ensure the chamfer radius r2 of the third chamfered peripheral surface 6343. That is, to ensure the chamfer radius r2 of the third chamfered peripheral surface 6343, the portion between the first sub-groove wall 6373 and the first sub-peripheral surface 6341 needs to be extruded. The distance between the first sub-groove wall 6373 and the first sub-peripheral surface 6341 can be greater than or equal to 2.5 mm and less than or equal to 2.9 mm.

[0088] The second chamfered groove wall 6374 is connected between the first sub-groove wall 6373 and the fourth surface 644. The second chamfered groove wall 6374 is an arc chamfered surface, and the chamfer radius R1 of the second chamfered circumferential surface 6342 is the sum of the chamfer radius r1 of the second chamfered circumferential surface 6342 and the thickness of the first pin portion 641, so as to ensure the chamfer radius r1 of the second chamfered circumferential surface 6342. It should be noted that the second chamfered groove wall 6374 is formed during the stamping process to form the stamping groove 637. The chamfer radius R1 of the second chamfered groove wall 6374 is related to the chamfer radius r1 of the second chamfered peripheral surface 6342. Under the premise of a certain material thickness, the design of the chamfer radius R1 of the second chamfered groove wall 6374 and the chamfer radius r1 of the second chamfered peripheral surface 6342 can not only ensure that the stamping groove 637 can be stamped, but also ensure that the thickness of each position of the first pole post assembly 61 is approximately the same, thus ensuring the appearance consistency of the first pole post assembly 61.

[0089] The third chamfered groove wall surface 6375 connects the first sub-groove wall surface 6373 and the second groove bottom wall surface 6371. The third chamfered groove wall surface 6375 is a rounded chamfer surface, and its chamfer radius R2 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm to ensure the chamfer radius r2 of the third chamfered circumferential surface 6343 and the chamfer radius r3 of the fourth chamfered circumferential surface 6362. In some other embodiments, the chamfer radius R2 of the third chamfered groove wall surface 6375 may also be greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0090] Please refer to the following: Figures 14 to 16 , Figure 14 yes Figure 5 The diagram shows the structure of the second pole post assembly 62 in the end cap assembly 120. Figure 15 yes Figure 14 The diagram shows a cross-sectional view of the second pole post assembly 62 after it is cut along point III-III. Figure 16 yes Figure 15 The diagram shows the structure of region B in the second pole assembly 62.

[0091] The second terminal assembly 62 differs from the first terminal assembly 61 in that, in the second terminal assembly 62, terminal 63 serves as the negative terminal, and pin 64 serves as the negative pin, and is electrically connected to the negative electrode tab of the cell assembly. The second terminal assembly 62 also includes a conductive element 65, which is fixedly connected to the second pin portion 642. For example, the conductive element 65 can be fixedly connected to the second pin portion 642 by ultrasonic welding. The material of the conductive element 65 is different from the material of the pin 64, but the same as the material of the negative electrode tab. For example, the conductive element 65 is made of copper. By combining the pin 64 and the conductive element 65, which are made of different materials, the cost of the second terminal assembly 62 can be reduced, thereby reducing the cost of the end cap assembly 120 and improving the product competitiveness of the energy storage device 100.

[0092] Please refer to the following: Figure 17 and Figure 18 , Figure 17 yes Figure 14 The diagram shows the structure of pole 63 and pin 64 in the second pole assembly 62 at another angle. Figure 18 yes Figure 17 A schematic diagram of the structure of region C in the second pole post assembly 62 shown.

[0093] The second pin portion 642 is provided with a first mounting groove 648, the opening of which is located on the first surface 646. The first mounting groove 648 is recessed from the first surface 646 toward the fifth surface 647. The first mounting groove 648 has a first groove bottom wall surface 6481 and a first groove side wall surface 6482. The first groove bottom wall surface 6481 is disposed opposite to the opening of the first mounting groove 648. The first groove side wall surface 6482 is disposed around the first mounting groove 648 and connects between the first groove bottom wall surface 6481 and the first surface 646, and is fixedly connected to the conductive member 65.

[0094] The first groove sidewall 6482 includes multiple straight-edged groove walls 6483 and multiple first chamfered groove walls 6484. The multiple straight-edged groove walls 6483 are spaced apart around the first mounting groove 648 and are all connected between the first groove bottom wall 6481 and the first surface 646. In this embodiment, each straight-edged groove wall 6483 is an inclined surface, and the angle between each straight-edged groove wall 6483 and the first groove bottom wall 6481 is an obtuse angle. The dimension c1 of the projection of each straight-edged groove wall 6483 onto the plane containing the first groove bottom wall 6481 is greater than or equal to the thickness of the conductive element 65. In other embodiments, the dimension c1 of the projection of each straight-edged groove wall 6483 onto the plane containing the first groove bottom wall 6481 may also be greater than or equal to 0.5 mm.

[0095] The beveled surface of the straight-edge groove wall 6483 not only serves as a guide, directing the conductive component 65 into the first mounting groove 648, but also prevents incorrect installation of the conductive component 65. Furthermore, the beveled design of the straight-edge groove wall 6483 facilitates the bonding of the pin 64 and the conductive component 65, improving their bonding strength. It also relieves stress concentration caused by the straight-edge groove wall 6483, preventing scratching issues during assembly, improving the current-carrying capacity of the second electrode assembly 62, reducing the internal resistance of the energy storage device 100, and improving its energy efficiency.

[0096] Each first chamfered groove wall 6484 is connected between two adjacent straight-edge groove walls 6483. Each first chamfered groove wall 6484 is a rounded chamfered surface, and the chamfer radius R3 of the first chamfered groove wall 6484 is greater than or equal to one time the thickness of the conductive element 65. This not only avoids stress concentration on the straight-edge groove wall 6483, but also avoids scraping problems during the assembly of the pin 64 and the conductive element 65, ensuring the assembly reliability of the second pole assembly 62. For example, the first mounting groove 648 is a rectangular groove, and there are four straight-edge groove walls 6483 and four first chamfered groove walls 6484. In some other embodiments, the chamfer radius R3 of the first chamfered groove wall 6484 may also be greater than or equal to 0.5 times the thickness of the conductive element 65.

[0097] Please refer to the following: Figure 19 and Figure 20 , Figure 19 yes Figure 14 The diagram shows the structure of the conductive element 65 in the second pole assembly 62 at another angle. Figure 20 yes Figure 19 A schematic diagram of the structure of region D in the second pole post assembly 62 shown.

[0098] The conductive element 65 is mounted in the first mounting groove 648. At least a portion of the conductive element 65 reuses the thickness space of the second pin portion 642, which helps reduce the volume of the second electrode assembly 62 and improve the energy density of the energy storage device 100. Specifically, the conductive element 65 can be interference-fitted with the first mounting groove 648. The thickness of the conductive element 65 can be greater than the depth of the first mounting groove 648. In this case, the conductive element 65 can be assembled into the first mounting groove 648 by external force. The thickness of the conductive element 65 is greater than or equal to 0.8 mm, and the width of the conductive element 65 can be greater than or equal to 2 mm to ensure that the conductive element 65 can be assembled with the pin 64 by suction nozzle adsorption, ensuring a high assembly yield between the conductive element 65 and the pin 64.

[0099] In this embodiment, the conductive component 65 and the pin 64 can be assembled by welding and interference fit to ensure the assembly stability between the conductive component 65 and the pin 64. In some other embodiments, the conductive component 65 and the pin 64 can be assembled by welding alone, or by interference fit alone; this application does not impose specific limitations on this.

[0100] The conductive element 65 includes a second surface 651, a sixth surface 652, and a first peripheral surface 653. The second surface 651 is disposed opposite to the bottom wall surface 6481 of the first groove. The sixth surface 652 is disposed opposite to the second surface 651 and may be flush with the first surface 646. The first peripheral surface 653 connects the second surface 651 and the sixth surface 652 and is disposed opposite to the side wall surface 6482 of the first groove. When the conductive element 65 is soldered to the pin 64, the edges of the second surface 651 and the edges of the sixth surface 652 are soldered to the pin 64. The first peripheral surface 653 may be a plane to ensure the soldering effect between the conductive element 65 and the pin 64, thereby ensuring the assembly stability between the conductive element 65 and the pin 64. In some other embodiments, the sixth surface 652 may not be flush with the first surface 646.

[0101] The first circumferential surface 653 includes multiple straight-edged circumferential surfaces 6531 and multiple first chamfered circumferential surfaces 6532. The multiple straight-edged circumferential surfaces 6531 are spaced apart around the conductive element 65 and are all connected between the second surface 651 and the sixth surface 652, and are positioned opposite to the multiple straight-edged groove walls 6483. In this embodiment, each straight-edged circumferential surface 6531 is an inclined surface, and the angle between each straight-edged circumferential surface 6531 and the second surface 651 is an obtuse angle, and the angle between each straight-edged circumferential surface 6531 and the sixth surface 652 is an acute angle. The dimension c2 of the projection of each straight-edged circumferential surface 6531 onto the plane of the second surface 651 is greater than or equal to the thickness of the conductive element 65. In some other embodiments, the dimension c2 of the projection of each straight-edged circumferential surface 6531 onto the plane of the second surface 651 may also be greater than or equal to 0.5 mm.

[0102] The beveled surface of the straight edge 6531 not only serves as a guide, directing the installation of the conductive component 65, but also prevents incorrect installation. Furthermore, the beveled design of the straight edge 6531 facilitates the bonding of the pin 64 and the conductive component 65, improving their bonding strength. It also relieves stress concentration caused by the straight edge 6531, preventing scratching issues during assembly, improving the current-carrying capacity of the second electrode assembly 62, reducing the internal resistance of the energy storage device 100, and improving its energy efficiency.

[0103] Each first chamfered circumferential surface 6532 is connected between two adjacent straight-edge circumferential surfaces 6531 and is disposed opposite to a first chamfered groove wall surface 6484. Each first chamfered circumferential surface 6532 is a rounded chamfered surface, and the chamfer radius r4 of the first chamfered circumferential surface 6532 is greater than or equal to the thickness of the conductive element 65. This not only avoids stress concentration on the straight-edge circumferential surface 6531 but also avoids scraping problems during the assembly of the pin 64 and the conductive element 65, ensuring the assembly reliability of the second electrode assembly 62. For example, the conductive element 65 is rectangular, with four straight-edge circumferential surfaces 6531 and four first chamfered circumferential surfaces 6532. In some other embodiments, the chamfer radius r4 of the first chamfered circumferential surface 6532 may also be greater than or equal to half the thickness of the conductive element 65.

[0104] In this embodiment, the second electrode assembly 62 further includes an anti-corrosion layer (not shown in the figure), which is disposed on the second pin portion 642 to prevent electrochemical corrosion of the second pin portion 642. The anti-corrosion layer can be a nickel plating layer, a copper plating layer, or a polypropylene (PP) layer, etc., which are films with anti-electrochemical corrosion functions. It should be noted that the anti-corrosion layer can also be disposed on the conductive element 65. The anti-corrosion layer can completely cover both the second pin portion 642 and the conductive element 65, or it can only cover the portion where the second pin portion 642 is joined to the conductive element 65, as long as the portion of the second pin portion 642 in contact with the electrolyte is covered by the anti-corrosion layer. This application does not impose specific limitations in this regard.

[0105] Please refer to the following: Figure 4 Each pressure block 70 is installed in the third mounting groove 504 of an upper insulating member 50 and sleeved on the pole 63 of a pole assembly 60, and welded and fixed to the second pole portion 632 of the pole 63. Each pressure block 70 is provided with a third limiting hole 701, which is located on the periphery of the pole 63 and spaced apart from the pole 63. The opening of the third limiting hole 701 is located on the surface of the pressure block 70 facing the bottom wall of the groove 504. The third limiting hole 701 communicates with the second limiting hole 505 of the upper insulating member 50. There are multiple third limiting holes 701, which are spaced around the pole 63 and communicate with each of the multiple second limiting holes 505.

[0106] Each sealing ring 80 passes through a second mounting hole 403 of the lower insulating member 40 and a first mounting hole 104 of the end cap 10, and is sleeved on the pole 63 of a pole assembly 60, and is clamped between the first pole portion 631 of the pole 63 and the end cap 10. This not only avoids direct contact and short circuit between the pole 63 and the end cap 10, but also seals the gap between the pole 63 and the end cap 10, ensuring the sealing reliability of the end cap assembly 120.

[0107] Each limiting member 90 passes through a second limiting hole 505 in the upper insulating member 50. One end of the limiting member 90 is inserted into the first limiting hole 105 of the end cap 10, and the other end is inserted into the third limiting hole 701 of the pressure block 70. The design of the limiting member 90 can not only increase the assembly stability of the end cap assembly 120, but also improve the torsional strength of the pole post 63 and improve the reliability of the energy storage device 100.

[0108] This application also provides an electrical device, which includes the aforementioned energy storage device 100, and the energy storage device 100 supplies power to the electrical device. The electrical device can be a new energy vehicle, a power storage station, a server, or other equipment that requires electricity.

[0109] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pole assembly, characterized by The device includes a pole, a pin, and a conductive element. The pin includes a first pin portion and a second pin portion. The first pin portion is fixedly connected to the pole, and the second pin portion is fixedly connected to the first pin portion and intersects with the first pin portion. The conductive element is fixedly connected to the second pin portion, and the material of the conductive element is different from the material of the pin.

2. The pole assembly of claim 1, wherein, The second pin portion has a first surface, which is a surface in the thickness direction of the second pin portion. The second pin portion is provided with a first mounting groove, the opening of which is located on the first surface. The conductive element is mounted in the first mounting groove.

3. The pole assembly of claim 2, wherein, The conductive component is interference-fitted with the first mounting groove.

4. The pole assembly of claim 2 or 3, wherein, The first mounting groove has a first groove sidewall, which includes a plurality of straight-edge groove walls and a plurality of first chamfered groove walls. The plurality of straight-edge groove walls are arranged at intervals around the first mounting groove, and each first chamfered groove wall is connected between two adjacent straight-edge groove walls. The conductive component has a first circumferential surface, which includes multiple straight-edge circumferential surfaces and multiple first chamfered circumferential surfaces. The multiple straight-edge circumferential surfaces are arranged at intervals around the conductive component and are arranged opposite to the multiple straight-edge groove walls one by one. Each first chamfered circumferential surface is connected between two adjacent straight-edge circumferential surfaces and is arranged opposite to a first chamfered groove wall.

5. The pole assembly according to claim 4, characterized in that, Both the first chamfered groove wall and the first chamfered circumferential surface are circular arc chamfered surfaces. The chamfer radius of the first chamfered groove wall and the chamfer radius of the first chamfered circumferential surface are both greater than or equal to 0.5 times the thickness of the second pin portion.

6. The pole assembly of claim 5, wherein, The chamfer radius of the first chamfer groove wall and the chamfer radius of the first chamfer circumference are both greater than or equal to 1 times the thickness of the second pin portion.

7. The electrode assembly according to claim 4, characterized in that, The first mounting groove also has a first groove bottom wall surface, which is opposite to the opening of the first mounting groove and connected to the side wall surface of the first groove. The straight edge groove wall surface is an inclined surface, and the size of the projection of the straight edge groove wall surface on the plane where the first groove bottom wall surface is located is greater than or equal to 0.5 mm. The conductive element also has a second surface, which is connected to the first circumferential surface and is disposed opposite to the bottom wall of the first groove. The straight edge circumferential surface is an inclined surface, and the size of the projection of the straight edge circumferential surface on the plane where the second surface is located is greater than or equal to 0.5 mm.

8. The pole assembly of claim 7, wherein, The dimensions of the projection of the straight-edge groove wall surface onto the plane containing the first groove bottom wall surface and the dimensions of the projection of the straight-edge peripheral surface onto the plane containing the second surface are the same as the thickness of the conductive component.

9. The pole assembly of any one of claims 1 to 3, wherein, The second pin is made of aluminum, and the conductive component is made of copper.

10. The pole assembly of claim 9, wherein, The pole assembly also includes an anti-corrosion layer, which is disposed on the second pin portion.

11. The pole assembly of any one of claims 1 to 3, wherein, The pole and the pin are integrally formed.

12. The pole assembly of claim 11, wherein, The first pin portion has a third surface, which is a surface in the thickness direction of the first pin portion. The pole includes a first pole portion, which is fixedly connected to the first pin portion. The first pole portion has a second circumferential surface, which includes a first sub-circumferential surface and a second chamfered circumferential surface. The second chamfered circumferential surface is connected between the first sub-circumferential surface and the third surface. The second chamfered circumferential surface is an arc chamfered surface, and the chamfer radius of the second chamfered circumferential surface is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

13. The pole assembly of claim 12, wherein, The first pole post portion also has a first protruding surface, which is the surface of the first pole post portion that is opposite to the first pin portion and is connected to the second peripheral surface; The pole post further includes a second pole post portion, which is fixedly connected to the first protruding surface. The second pole post portion has a third circumferential surface, and the orthographic projection of the third circumferential surface onto the first pole post portion is located inside the second circumferential surface.

14. The pole assembly of claim 13, wherein, The second circumferential surface also includes a third chamfered circumferential surface, which is connected between the first sub-circumferential surface and the first protruding surface. The third chamfered circumferential surface is a circular arc chamfered surface, and the chamfer radius of the third chamfered circumferential surface is less than or equal to 0.5 mm.

15. The pole assembly of claim 13, wherein, The second pole post also has a second protruding surface, which is the surface of the second pole post that is away from the first pole post. The third circumferential surface includes a second sub-circumferential surface and a fourth chamfered circumferential surface. The fourth chamfered circumferential surface is connected between the second sub-circumferential surface and the second protruding surface. The fourth chamfered circumferential surface is a rounded chamfered surface, and the chamfer radius of the fourth chamfered circumferential surface is less than or equal to 0.5 mm.

16. The pole assembly of any one of claims 12 to 15, wherein, The first pin portion also has a fourth surface, which is disposed opposite to the third surface; The pole post is provided with a stamping groove, the opening of which faces the same direction as the fourth surface, and the diameter of the stamping groove is greater than or equal to twice the thickness of the first pin portion.

17. An end cap assembly for use in an energy storage device, comprising: Includes an end cap, a lower insulating member, an upper insulating member, an electrode assembly as described in any one of claims 1 to 16, and a pressure block; The end cap is provided with a first mounting hole, which penetrates the end cap along the thickness direction. Along the thickness direction of the end cap, the lower insulating member is located on one side of the end cap. The lower insulating member is provided with a second mounting hole, which penetrates the lower insulating member along the thickness direction and communicates with the first mounting hole. The upper insulating member is installed on the side of the end cap opposite to the lower insulating member, and is provided with a third mounting hole. The third mounting hole penetrates the upper insulating member along the thickness direction and communicates with the first mounting hole. The pole is inserted through the first mounting hole, the second mounting hole and the third mounting hole, and the pin and the conductive element are both located on the side of the lower insulating element away from the end cover; The pressure block is installed on the upper insulating member, sleeved on the pole post, and fixedly connected to the pole post.

18. The end cap assembly of claim 17, wherein, The first pin portion is provided with a positioning hole, which penetrates the first pin portion along the thickness direction; The lower insulating component is provided with a positioning post, which is located on the side of the lower insulating component away from the end cap and passes through the positioning hole.

19. The end cap assembly according to claim 18, characterized in that, The positioning hole is located on the side of the pole away from the second pin portion.

20. An energy storage device, comprising: The device includes a housing, a battery cell assembly, and an end cap assembly as described in any one of claims 17 to 19. The housing has a receiving cavity and an opening. The receiving cavity is located inside the housing. The opening is located on the top side of the receiving cavity and communicates with the receiving cavity. The battery cell assembly is received in the receiving cavity. The end cap assembly is mounted on the housing and closes the opening. The second pin portion is electrically connected to the battery cell assembly.

21. The energy storage device of claim 20, wherein, The battery cell assembly includes a negative electrode tab, which is electrically connected to the second pin portion, and the material of the negative electrode tab is the same as the material of the conductive element.

22. An electrical device, comprising: Includes the energy storage device as described in claim 20 or 21, wherein the energy storage device supplies power to the electrical equipment.

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