End cover assembly, energy storage device and electric equipment

Abstract

The embodiment of the utility model provides an end cover assembly, an energy storage device and electric equipment. The end cover assembly comprises lower plastic, a pin, a pole and a heat insulation part. The lower plastic comprises a limiting boss arranged on the surface in the thickness direction, the limiting boss comprises a boss surface, the lower plastic further comprises an assembling groove and a groove, the assembling groove is concavely formed in the boss surface, the groove is concavely formed in the boss surface, and the groove is communicated with the assembling groove; the connecting part of the pin is installed in the assembling groove and comprises a through hole, a vent groove and an exhaust groove. The vent groove is communicated with the groove through the exhaust groove so as to form an exhaust channel; a part of the heat insulation piece at least covers the limiting boss, the connecting part and the pole, the part of the heat insulation piece cannot block the exhaust channel, and the first part and the welding position of the pole and the connecting part are arranged at intervals.

Description

Technical Field

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

[0002] With the gradual development of energy storage technology, more and more devices are using secondary batteries and other energy storage devices as their main energy source. As the demand for energy storage devices increases, people are placing higher and higher demands on the safety of these devices.

[0003] Typically, to prevent short circuits or even fires and explosions caused by contact between the core and the pins and terminals, high-temperature adhesive is applied to the surfaces of the terminals and pins facing the core. However, due to the presence of this high-temperature adhesive, defects in the soldering areas of the terminals and pins (such as pinholes and age-related cracks) are difficult to detect, leading to false seals, reduced safety of the energy storage device, and negatively impacting the customer's user experience. Utility Model Content

[0004] This application provides an end cap assembly, an energy storage device, and an electrical device, which can avoid the false sealing problem of the end cap assembly, ensure the safety of the energy storage device, and improve the user experience.

[0005] In a first aspect, embodiments of this application provide an end cap assembly, the end cap assembly comprising:

[0006] End cap body;

[0007] The lower plastic body includes a lower plastic body and a limiting boss. The limiting boss protrudes from one surface of the lower plastic body in the thickness direction and is located at one end of the lower plastic body in the length direction. The limiting boss includes a boss surface facing away from the lower plastic body. The lower plastic body also includes an assembly groove and a recess. The assembly groove is recessed in the boss surface and includes a groove circumferential surface. The groove circumferential surface is connected to the boss surface and is set at an angle to the boss surface. The recess is recessed in the boss surface and penetrates the outer circumferential surface of the limiting boss and the groove circumferential surface. The recess is located outside the assembly groove and communicates with the assembly groove.

[0008] A pin, the pin including a connecting portion, the connecting portion being received within the mounting slot;

[0009] The connecting portion includes a through hole that extends through both surfaces of the connecting portion in the thickness direction. The connecting portion also includes a vent groove and an exhaust groove, both recessed in the surface of the connecting portion facing away from the mounting groove in the thickness direction. The vent groove is arranged around the periphery of the through hole and communicates with the through hole. The exhaust groove is connected to the outer periphery of the vent groove and communicates with the vent groove.

[0010] The exhaust channel is opposite to and communicates with the groove;

[0011] The electrode post is stacked with the lower plastic and the end cap body along the thickness direction of the end cap assembly. The electrode post is sequentially inserted through the holes of the end cap body, the lower plastic and the connecting part, and is welded to the connecting part for conduction.

[0012] A heat insulation component is stacked on the side of the pin facing away from the lower plastic. The heat insulation component includes a first part, which at least covers the limiting boss, the connecting part, and the pole post. Along the thickness direction of the end cap assembly, the first part is spaced apart from the bottom surface of the vent groove, the bottom wall of the exhaust groove, and the bottom wall of the recess. The first part is also spaced apart from the welding joints of the pole post and the connecting part.

[0013] In one embodiment, there are two grooves, namely a first groove and a second groove, and there are two exhaust channels, namely a first exhaust channel and a second exhaust channel. The first exhaust channel and the first groove are opposite to and connected to each other, and the second exhaust channel and the second groove are opposite to and connected to each other.

[0014] In one embodiment, the limiting boss includes a first side and a second side disposed opposite to each other, the first side and the second side being connected to the boss surface and disposed opposite to each other along the width direction of the limiting boss; the groove peripheral surface includes a first sub-surface and a second sub-surface, the first sub-surface and the second sub-surface being disposed opposite to each other along the width direction of the assembly groove, and the orientation of the first side being the same as the orientation of the second sub-surface.

[0015] The first groove extends through the first side surface and the first sub-surface, and the second groove extends through the second side surface and the second sub-surface, with the first groove and the second groove being disposed opposite to each other.

[0016] In one embodiment, the connecting portion includes a first connecting side and a second connecting side, the first connecting side and the second connecting side are arranged opposite to each other along the width direction of the connecting portion, the first vent groove passes through the first connecting side, and the second vent groove passes through the second connecting side.

[0017] The first exhaust groove and the second exhaust groove are symmetrically arranged about the central axis of the length direction of the connecting part. Along the width direction of the end cap assembly, the projection of the first exhaust groove is located within the projection of the first groove, and the projection of the second exhaust groove is located within the projection of the second groove.

[0018] In one embodiment, the pole further includes a pole body and a flange. The pole body is connected to one side of the flange in the height direction. A pole protrusion is provided on the side of the pole body away from the flange. The pole protrusion is arranged along the periphery of the pole body. The pole protrusion includes a first adhesive surface, which faces away from the pole body.

[0019] The pin also includes a pin protrusion, which protrudes from the surface of the connecting portion facing away from the mounting groove in the thickness direction. The pin protrusion surrounds the through hole and forms the vent groove, the first exhaust groove and the second exhaust groove. The pin protrusion includes a second adhesive surface, which faces the same direction as the first adhesive surface. The first part is connected to the first adhesive surface and the second adhesive surface.

[0020] In one embodiment, the height of the pole post protrusion is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0021] In one embodiment, the pole includes a welding surface that is flush with the bottom wall of the venting groove, and the welding surface is opposite to and spaced apart from the first portion.

[0022] In one embodiment, the connecting portion further includes an avoidance ring groove, which is recessed on the surface of the connecting portion facing the mounting groove. A portion of the pole post is accommodated in the avoidance ring groove and abuts against the groove wall surface of the avoidance ring groove.

[0023] In one embodiment, the pin further includes an adapter portion connected to the connecting portion and disposed at an angle to the connecting portion, the adapter portion extending away from the lower plastic;

[0024] The heat insulation component further includes a second part, which is connected to the first part and is disposed at an angle to the first part, and the second part at least covers the surface of the adapter facing the connection part.

[0025] In one embodiment, the ratio of the depth of the vent groove to the thickness of the connecting portion is greater than or equal to 0.025 and less than or equal to 0.33.

[0026] In one embodiment, the widths of the first venting groove and the second venting groove are both greater than or equal to the weld width of the molten pool formed by welding the pole and the connecting part.

[0027] In one embodiment, the heat insulation component is a high-temperature adhesive.

[0028] Secondly, embodiments of this application provide an energy storage device. The energy storage device includes a housing, an electrode assembly, and an end cap assembly. The housing includes an opening, the electrode assembly is housed within the housing, and the electrode assembly includes a battery cell and a tab. The tab is electrically connected to the battery cell. The end cap assembly seals the opening. A pin adapter is stacked with the tab and welded to the tab for electrical connection. A first portion of a heat insulation member is located between the connecting portion and the battery cell, and a second portion of the heat insulation member is located between the adapter and the battery cell.

[0029] Thirdly, embodiments of this application provide an electrical device. The electrical device includes the aforementioned energy storage device, which is used to supply power to the electrical device.

[0030] In related technologies, to prevent short circuits or even fires and explosions caused by contact between the core and the pins and terminals, high-temperature adhesive needs to be applied to the surfaces of the terminals and pins facing the core to prevent contact. However, due to the presence of the high-temperature adhesive, defects in the welding areas of the terminals and pins (such as pinholes, aging cracks, etc.) are not easily detected, which can easily lead to false seals, reduce the safety of the energy storage device, and affect the user experience.

[0031] In this embodiment, a venting groove, a first exhaust groove, and a second exhaust groove are provided around the perforation of the pins in the end cap assembly. A first groove and a second groove are respectively provided on the lower plastic corresponding to the positions of the first and second exhaust grooves. The first groove is connected to the venting groove through the first exhaust groove. The second groove is connected to the venting groove through the second exhaust groove. That is, the first groove, the second groove, the first exhaust groove, the second exhaust groove, and the venting groove together constitute an exhaust channel. The first part of the heat insulation component is connected to the lower plastic and the connecting part. The first part does not block the exhaust channel, allowing helium gas to flow smoothly within the exhaust channel during helium testing of the end cap assembly. This effectively detects defects at the electrode and pin welding points, preventing a false seal between the first part and the lower plastic from affecting the test results of the end cap assembly during helium testing. This prevents defective end cap assemblies from entering the market, causing customer complaints or even safety accidents, ensuring the safety of the energy storage device and improving the customer's user experience.

[0032] In addition, the welding surface of the pole is flush with the bottom wall of the vent groove. When the first part of the heat insulation component is connected to the connection part, it not only avoids poor welding of the pole and the pin, but also prevents the weld from piercing the first part and affecting its performance. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments or background art of this application, the accompanying drawings used in the embodiments or background art of this application will be described below.

[0034] Figure 1 This is an application scenario diagram of the energy storage device provided in the embodiments of this application;

[0035] Figure 2 for Figure 1 The diagram shown is a simplified structural representation of the energy storage device.

[0036] Figure 3 for Figure 2 The diagram shows the exploded structure of the energy storage device.

[0037] Figure 4 for Figure 3 A schematic diagram of the end cap assembly of the energy storage device at one angle, according to a first embodiment;

[0038] Figure 5 for Figure 4 The diagram shows an exploded view of the end cap assembly.

[0039] Figure 6 for Figure 5 The diagram shows a partial exploded view of the end cap assembly from another angle.

[0040] Figure 7 for Figure 5 The diagram shows the pins of the end cap assembly at another angle.

[0041] Figure 8 for Figure 5 The diagram shows a cross-sectional view of a portion of the end cap assembly.

[0042] Figure 9 for Figure 8 The diagram shows a cross-sectional view of part of the end cap assembly and the thermal insulation component;

[0043] Figure 10 for Figure 3 A schematic diagram of the end cap assembly of the energy storage device in a second embodiment at one angle;

[0044] Figure 11 for Figure 10 A partially enlarged schematic diagram of the M region of the pins of the end cap assembly shown;

[0045] Figure 12 for Figure 10 The diagram shows a cross-sectional view of a portion of the end cap assembly.

[0046] Figure 13 for Figure 12 The diagram shows a cross-sectional view of part of the end cap assembly and the insulation component.

[0047] The terms corresponding to the reference numerals in the figures are as follows: energy storage device 1000, end cap assembly 100, end cap body 10, upper surface 11, lower surface 12, first pole post through hole 13, lower plastic 20, lower plastic body 21, top surface 211, bottom surface 212, limiting boss 23, boss surface 231, first side surface 232, second side surface 233, assembly groove 24, groove bottom surface 241, groove peripheral surface 242, first sub-surface 243, second sub-surface 244, and so on. 245, 246, 25, 26, 27, 30, 31, 311, 312, 313, 314, 315, 316, 316a, 316b, 317, 318, 319, 320, 33, 34, 35, 36, 37, 318, 319, 320, 33, 34, 35, 36, 37, 318, 319, 320, 33, 34, 35, 316, 316, 316a, 316b, 317, 318, 319, 320, 320, 33, 34, 315, 316 ... Surface 331, outer surface 332, pin protrusion 34, second bonding surface 341, surrounding section 35, arc-shaped section 351, first extension section 36, first sub-segment 361, second extension section 37, second sub-segment 371, pole post 40, flange 41, pole post body 42, welding surface 421, step 43, first step surface 431, second step surface 432, groove 44, pole post protrusion 45, first bonding surface 46, outer ring surface 47, inner ring surface 48, upper plastic Glue 50, upper plastic body 51, extension 52, first through hole 53, sealing ring 60, second through hole 61, heat insulation component 70, first part 71, second part 72, electrode assembly 200, battery cell 210, electrode tab 220, housing 300, opening 301, receiving cavity 302, first electrical device 3000, second electrical device 2000, first power conversion device 4100, second power conversion device 4200, energy storage system 5000. Detailed Implementation

[0048] 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.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly specified. Furthermore, the terms "same," "equal," or "parallel" used below are all allowed to have certain tolerances.

[0050] It should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of those features.

[0051] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form according to future application needs. As we all know, to achieve the grand goal of carbon neutrality, 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 photovoltaics, wind power, and hydropower. However, wind and solar energy generally suffer from strong intermittency and large fluctuations, which can cause grid instability, insufficient electricity during peak demand periods, and excessive electricity 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. Energy storage involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, the stored energy is converted back into electrical energy and released. Simply put, energy storage is like a large "power bank". When there is sufficient solar and wind power, electrical energy is stored and the stored power is released when needed.

[0052] Taking electrochemical energy storage as an example, this application provides an energy storage device. The energy storage device is equipped with a set of chemical batteries. It mainly uses the chemical elements in the chemical batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, it stores the electrical energy generated by wind and solar energy in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0053] Current energy storage applications are quite widespread, including energy storage on the (wind and solar) power generation side, grid-side energy storage, base station-side energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0054] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0055] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side mainly operate under the "peak shaving and valley filling" mode. Since there are large price differences in electricity prices at peak and valley times depending on electricity demand, users with energy storage equipment usually charge the energy storage cabinet / box during the low electricity price period in order to reduce costs; and release the electricity in the energy storage equipment for use during the peak electricity price period to achieve the purpose of saving electricity costs.

[0056] It should be noted that the aforementioned energy storage containers, small and medium-sized energy storage cabinets, and small household energy storage boxes, which contain energy storage devices, can be understood as electrical equipment.

[0057] Please see Figure 1 , Figure 1 This is an application scenario diagram of the energy storage device provided in the embodiments of this application.

[0058] The energy storage device 1000 provided in this application embodiment is applied to an energy storage system 5000. The energy storage system 5000 includes a first power conversion device 4100 (photovoltaic panel), a second power conversion device 4200 (wind turbine), a first electrical device 3000 (grid), a second electrical device 2000 (base station), and the energy storage device 1000. The energy storage system 5000 also includes an energy storage cabinet, in which the energy storage device 1000 is installed. The energy storage cabinet can be installed outdoors. Specifically, the first power conversion device 4100 can convert solar energy into electrical energy during periods of low electricity prices. The energy storage device 1000 stores this electrical energy and supplies it to the first electrical device 3000 or the second electrical device 2000 during peak electricity demand periods, or provides power when the first electrical device 3000 or the second electrical device 2000 experiences a power outage. The second power conversion device 4200 can convert wind energy into electrical energy, and the energy storage device 1000 is used to store the electrical energy and supply it to the first electrical device 3000 or the second electrical device 2000 during peak electricity consumption, or to supply power when the first electrical device 3000 or the second electrical device 2000 experiences a power outage. The electrical energy can be transmitted via high-voltage cables.

[0059] It should be noted that the aforementioned first electrical device 3000, second electrical device 2000, and other devices including the energy storage device 1000 can be understood as electrical devices. The energy storage device 1000 supplies power to the electrical devices.

[0060] The number of energy storage devices 1000 can be multiple, and the multiple energy storage devices 1000 can be connected in series or in parallel. In this embodiment, "multiple" means two or more.

[0061] It is understood that the energy storage device 1000 may include, but is not limited to, single-cell batteries, battery modules, battery packs, and battery systems. The actual application form of the energy storage device 1000 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. For example, the energy storage device 1000 may be a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, or other rechargeable batteries. When the energy storage device 1000 is a single-cell battery, it may be a cylindrical battery, a prismatic battery, or a battery of other shapes. In this embodiment, the energy storage device 1000 is a prismatic battery. The prismatic battery is a rechargeable battery.

[0062] Please refer to the following: Figure 2 and Figure 3 , Figure 2 for Figure 1 The diagram shown is a simplified structural representation of the energy storage device. Figure 3 for Figure 2 The diagram shows the exploded structure of the energy storage device.

[0063] For ease of description, the width of the energy storage device 1000 is defined as the X-axis, the length as the Y-axis, and the height as the Z-axis. The X-axis, Y-axis, and Z-axis are all perpendicular to each other.

[0064] The directional terms such as "upper," "top," "lower," "bottom," "left," and "right" mentioned in the embodiments of this application are based on the appendix to the specification. Figure 2 and Figure 3 The description of the orientation shown does not constitute a limitation on the actual application scenario of the energy storage device 1000. Specifically, the positive direction toward the Z-axis is defined as the top or above of the energy storage device 1000, and the negative direction toward the Z-axis is defined as the bottom or below of the energy storage device 1000.

[0065] The energy storage device 1000 includes an end cap assembly 100, an electrode assembly 200, and a housing 300. The housing 300 has an opening 301 and a receiving cavity 302. The opening 301 and the receiving cavity 302 are in communication. The electrode assembly 200 is received within the receiving cavity 302. The end cap assembly 100 is mounted on one end of the electrode assembly 200 in the height direction (Z-axis direction). The end cap assembly 100 seals the opening 301 to isolate the internal environment of the energy storage device 1000 from the external environment, that is, to isolate the electrode assembly 200 from the external environment of the energy storage device 1000. In this embodiment, the housing 300 is rectangular in shape.

[0066] The electrode assembly 200 includes a battery cell 210 and two tabs 220. The two tabs 220 extend from two sides along the length (Y-axis direction) of the battery cell 210, and both tabs 220 are electrically connected to the battery cell 210. One of the tabs 220 is a positive tab, and the other is a negative tab. This application does not impose any limitations on this.

[0067] Please refer to the following: Figure 4 , Figure 5 and Figure 6 , Figure 4 for Figure 3 The diagram shows a structural schematic of one angle of the end cap assembly of the energy storage device according to a first embodiment. Figure 5 for Figure 4 The diagram shows an exploded view of the end cap assembly.

[0068] The end cap assembly 100 includes an end cap body 10, a lower plastic 20, a pin 30, a terminal post 40, an upper plastic 50, a sealing ring 60, and a heat insulation element 70. The end cap body 10 and the lower plastic 20 are stacked along the thickness direction (Z-axis direction) of the end cap assembly 100. The length direction of the lower plastic 20 is the same as the length direction of the end cap body 10. The length of the lower plastic 20 is the same as or approximately the same as the length of the end cap body 10. The width of the lower plastic 20 is the same as or approximately the same as the width of the end cap body 10. The upper plastic 50 is fitted around the outer periphery of the terminal post 40. The terminal post 40 passes through the end cap body 10 and the lower plastic 20, and abuts the upper plastic 50 against the end cap body 10; that is, the upper plastic 50 is located between the terminal post 40 and the end cap body 10. The sealing ring 60 is fitted around the outer periphery of the terminal post 40 and the upper plastic 50. A portion of pin 30 is mounted on the side of the lower plastic 20 facing away from the end cap body 10 and connected to the electrode post 40. This portion of pin 30 is located between the cell 210 and the lower plastic 20, and abuts the sealing ring 60 against the end cap body 10; that is, the sealing ring 60 is located between pin 30 and the end cap body 10. Another portion of pin 30 extends away from the lower plastic 20 and is located on one side of the length direction of the cell 210. This portion of pin 30 is used for overlapping connection with the electrode tab 220 along the Y-axis direction. The electrode assembly 200 is electrically connected to the electrode post 40 through pin 30. A heat insulation element 70 is located between pin 30 and cell 210, and covers the surfaces of pin 30 and electrode post 40 facing cell 210 and part of the surface of lower plastic 20. The heat insulation element 70 is used to prevent the high-temperature electrode post 40 and pin 30 from contacting cell 210, which could cause cell 210 to be burned or even short-circuited. In this embodiment, there are two of each of the following components: pin 30, terminal post 40, upper plastic 50, sealing ring 60, and heat insulation element 70. The two terminal posts 40 are located at opposite ends along the length of the end cap assembly 100. Each terminal post 40 corresponds to one pin 30, one upper plastic 50, one sealing ring 60, and one heat insulation element 70.

[0069] Please see Figure 5 In this embodiment, one of the two terminals 40 is the positive terminal 40, and the other is the negative terminal 40. The two terminals 40 have roughly the same structure. The two pins 30 have roughly the same structure. The two upper plastic parts 50 have roughly the same structure. The two sealing rings 60 have roughly the same structure. The two heat insulation components 70 also have roughly the same structure. The fit between one terminal 40 and the pins 30, upper plastic parts 50, sealing rings 60, heat insulation components 70, end cap body 10, and lower plastic parts 20 is roughly the same as the fit between the other terminal 40 and the pins 30, upper plastic parts 50, sealing rings 60, heat insulation components 70, end cap body 10, and lower plastic parts 20. For ease of description, the following description focuses on the mating relationship between the pole post 40, pin 30, upper plastic 50, sealing ring 60, and heat insulation element 70 located at one end of the end cap assembly 100 along its length and the end cap body 10 and lower plastic 20. The mating relationship between the pole post 40, pin 30, upper plastic 50, sealing ring 60, and heat insulation element 70 located at the other end of the end cap assembly 100 along its length and the end cap body 10 and lower plastic 20 will not be described in detail.

[0070] In this embodiment, as Figure 5 As shown, the end cap body 10 is made of plain aluminum. The end cap body 10 is a long, thin strip. The end cap body 10 includes an upper surface 11 and a lower surface 12. The upper surface 11 and lower surface 12 are arranged opposite to each other along the thickness direction (Z-axis direction) of the end cap body 10. The end cap body 10 also includes a first pole post through hole 13. The first pole post through hole 13 is located at one end of the end cap body 10 along its length. Along the thickness direction of the end cap body 10, the first pole post through hole 13 penetrates both the upper surface 11 and the lower surface 12 of the end cap body 10. The first pole post through hole 13 is used for the pole post 40 to pass through.

[0071] Please see Figure 6 , Figure 6 for Figure 5 The diagram shown is an exploded view of part of the end cap assembly from another angle. It should be noted that... Figure 6The diagram illustrates the structure of the pole, upper plastic, lower plastic, and end cap body. The pole 40 includes a flange 41 and a pole body 42. Along the height direction of the pole 40, the pole body 42 protrudes from the surface of one side of the flange 41. The pole body 42 includes a welding surface 421. The welding surface 421 faces away from the flange 41. The pole body 42 also includes a step 43. The step 43 is arranged around the outer periphery of the pole body 42, and the step 43 is recessed from the welding surface 421 of the pole body 42 toward the flange 41. Alternatively, the step 43 can be understood as a portion of the end of the pole body 42 recessed toward the central axis of the pole body 42. The step 43 includes a first step surface 431 and a second step surface 432. The first step surface 431 is connected to the second step surface 432 and is arranged at an angle to the second step surface 432. The orientation of the first step surface 431 is the same as the orientation of the welding surface 421 of the pole body 42. The second step surface 432 connects to the welding surface 421 of the pole body 42 and is set at an angle to the welding surface 421. In this embodiment, the flange 41 is approximately a circular block. The step 43 is annular. The cross-section of the pole body 42 is approximately a T-shaped column. The pole body 42 and the flange 41 are coaxially arranged.

[0072] In this embodiment, the upper plastic 50 is made of plastic and is insulating. The upper plastic 50 includes an upper plastic body 51 and an extension 52. Along the height direction of the upper plastic 50, the extension 52 is connected to one end of the upper plastic body 51. The upper plastic body 51 protrudes from the outer periphery of the extension 52 and together with the extension 52 forms a first through hole 53. The first through hole 53 is used for the electrode post body 42 to pass through. The first through hole 53 is a stepped hole. In this embodiment, the upper plastic body 51 is an annular cylinder with a roughly L-shaped cross-section. The extension 52 is also roughly an annular cylinder. The upper plastic body 51 and the extension 52 are coaxially arranged.

[0073] In this embodiment, the sealing ring 60 is made of plastic and is insulating, capable of elastic deformation. The sealing ring 60 includes a second through hole 61. The second through hole 61 is used for the pole body 42 and the extension 52 of the upper plastic 50 to pass through.

[0074] The heat insulation component 70 includes a first portion 71 and a second portion 72. The first portion 71 is connected to the second portion 72. The extending directions of the first portion 71 and the second portion 72 are set at an angle. The first portion 71 is used to cover the side of the pin 30 facing away from the plastic 20. The second portion 72 is used to cover the side of the pin 30 facing the length direction of the cell 210. In this embodiment, the first portion 71 and the second portion 72 can be integrally formed or separately formed. The heat insulation component 70 has the characteristics of not easily shifting, high temperature resistance, small size, non-reaction with electrolyte, and blocking heat transfer. The heat insulation component 70 can be made of heat-insulating and non-detachable materials such as polyimide tape, Teflon tape, or Teflon coating. For example, the heat insulation component 70 is a high-temperature adhesive.

[0075] Please continue to refer to the following: Figure 5 and Figure 6 .

[0076] In this embodiment, the lower plastic 20 is made of plastic and is insulating. The lower plastic 20 is a long strip of thin sheet. The lower plastic 20 includes a lower plastic body 21. The lower plastic body 21 includes a top surface 211 and a bottom surface 212. The top surface 211 and the bottom surface 212 are arranged opposite to each other along the thickness direction (Z-axis direction) of the lower plastic body 21.

[0077] like Figure 6 As shown, the lower plastic body 20 also includes a limiting boss 23. The limiting boss 23 protrudes from the bottom surface 212 of the lower plastic body 21, and is located at one end of the lower plastic body 21 along its length (Y-axis direction). The limiting boss 23 includes a boss surface 231. The boss surface 231 faces away from the lower plastic body 21, and the orientation of the boss surface 231 is the same as the orientation of the bottom surface 212 of the lower plastic body 21. The limiting boss 23 also includes a first side surface 232 and a second side surface 233. The first side surface 232 and the second side surface 233 are arranged opposite to each other along the width direction (X-axis direction) of the limiting boss 23. The first side surface 232 and the second side surface 233 are connected to the boss surface 231 and the bottom surface 212 of the lower plastic body 21, and are arranged at an angle to both the boss surface 231 and the bottom surface 212. In this embodiment, the limiting boss 23 is approximately a rectangular protrusion. The first side surface 232 and the second side surface 233 form part of the outer peripheral surface of the limiting boss 23.

[0078] The lower plastic body 20 also includes an assembly groove 24. The assembly groove 24 is recessed into the boss surface 231 of the limiting boss 23 and is recessed towards the lower plastic body 21. The assembly groove 24 is used to accommodate a portion of the pins 30. The assembly groove 24 includes a bottom surface 241 and a peripheral surface 242. The orientation of the bottom surface 241 is the same as the orientation of the bottom surface 212 of the lower plastic body 21. The peripheral surface 242 surrounds the periphery of the bottom surface 241 and is connected to the bottom surface 241, and the peripheral surface 242 is connected to the boss surface 231 of the limiting boss 23. The peripheral surface 242 is set at an angle to both the bottom surface 241 and the boss surface 231.

[0079] The groove peripheral surface 242 includes a first sub-surface 243 and a second sub-surface 244. The first sub-surface 243 and the second sub-surface 244 are arranged opposite to each other along the width direction (X-axis direction) of the assembly groove 24. The first sub-surface 243 and the first side surface 232 are arranged opposite to each other along the X-axis direction. The second sub-surface 244 and the second side surface 233 are arranged opposite to each other along the X-axis direction.

[0080] The lower plastic body 20 also includes a second pole post through hole 25, which penetrates the bottom surface 241 of the assembly groove 24 and the top surface 211 of the lower plastic body 21, and the periphery of the second pole post through hole 25 is spaced apart from the groove periphery 242. The second pole post through hole 25 is used for the pole post body 42 to pass through.

[0081] The lower plastic body 20 also includes a first groove 245 and a second groove 246. Both the first groove 245 and the second groove 246 are recessed into the boss surface 231 of the limiting boss 23 and are recessed towards the lower plastic body 21. The bottom wall of the first groove 245 faces the same direction as the boss surface 231. The bottom wall of the second groove 246 faces the same direction as the boss surface 231. Both the first groove 245 and the second groove 246 are located on the outer periphery of the assembly groove 24, and both penetrate the peripheral surface 242 of the assembly groove 24 and the outer peripheral surface of the limiting boss 23. Both the first groove 245 and the second groove 246 communicate with the assembly groove 24 and are arranged opposite to each other. In this embodiment, the first groove 245 penetrates the first sub-surface 243 and the first side surface 232. The second groove 246 penetrates the second sub-surface 244 and the second side surface 233. The first groove 245 and the second groove 246 are located on opposite sides of the width direction of the assembly groove 24, and are symmetrically arranged about the central axis of the lower plastic 20 along its length direction. The first groove 245 and the second groove 246 are arranged opposite each other along the X-axis. The depth of both the first groove 245 and the second groove 246 is less than the height of the limiting boss 23.

[0082] The lower plastic 20 also includes a positioning post 26. The positioning post 26 protrudes from the bottom surface 241 of the assembly groove 24, and is spaced apart from the circumferential surface 242 of the assembly groove 24 and the second electrode through hole 25. The positioning post 26 is used for assembling and positioning the pin 30. In this embodiment, the positioning post 26 is approximately cylindrical. There is one positioning post 26. In some embodiments, there may be multiple positioning posts 26. Multiple positioning posts 26 are spaced apart. This application does not impose any limitations.

[0083] The lower plastic body 20 also includes a mounting boss 27. The mounting boss 27 protrudes from the bottom surface 212 of the lower plastic body 21. Along the Y-axis direction, the mounting boss 27 is connected to one side of the limiting boss 23 along its length direction (Y-axis direction). It can be understood that the mounting boss 27 and the mounting groove 24 are spaced apart along the Y-axis direction. In this embodiment, the mounting boss 27 extends along the X-axis direction. The mounting boss 27 is generally a rectangular protrusion.

[0084] In some embodiments, the lower plastic 20 further includes a mounting groove. The mounting groove is recessed into the boss surface 231 of the limiting boss 23 and is recessed towards the lower plastic body 21. The mounting groove is used to accommodate part of the heat insulation member 70 to reduce the space occupied by the heat insulation member 70 in the thickness direction of the end cap assembly 100. The mounting groove includes a groove sidewall and a groove bottom wall. The orientation of the groove bottom wall is the same as the orientation of the bottom surface 212. The groove sidewall is located on both sides of the groove bottom wall in the width direction and is connected to the groove bottom wall. It can be understood that the mounting groove 24 is recessed in the groove bottom wall of the mounting groove, and the mounting boss 27 is adjacent to the mounting groove along the Y-axis direction. The side surface of the mounting boss 27 constitutes a portion of the groove sidewall of the mounting groove facing the groove bottom wall. In other embodiments, the mounting groove may be omitted.

[0085] Please refer to the following: Figure 5 and Figure 7 , Figure 7 for Figure 5 The diagram shows the pins of the end cap assembly at another angle.

[0086] In this embodiment, the pin 30 is a metal sheet. The pin 30 includes a connecting portion 31 and an adapter portion 33. The connecting portion 31 and the adapter portion 33 are connected, and the extending directions of the connecting portion 31 and the adapter portion 33 are set at an angle. The connecting portion 31 is used to be accommodated in the assembly groove 24 of the lower plastic 20 and is used to be fixed and electrically connected to the electrode post 40 by welding. The adapter portion 33 is used to be fixed and electrically connected to the tab 220 of the battery cell 210 by welding. That is, the current of the battery cell 210 is sequentially transferred to the electrode post 40 through the tab 220, the adapter portion 33, and the connecting portion 31. In this embodiment, the pin 30 is approximately an L-shaped bent structure. The connecting portion 31 and the adapter portion 33 are located on different planes.

[0087] In this embodiment, the shape of the connecting portion 31 matches the shape of the mounting groove 24. The connecting portion 31 includes an inner connecting surface 311 and an outer connecting surface 312. The inner connecting surface 311 and the outer connecting surface 312 are arranged opposite to each other along the thickness direction (Z-axis direction) of the connecting portion 31. The outer connecting surface 312 is used to connect with a portion of the heat insulation member 70. The connecting portion 31 also includes a first connecting side surface 313 and a second connecting side surface 314. The first connecting side surface 313 and the second connecting side surface 314 are arranged opposite to each other along the width direction (X-axis direction) of the connecting portion 31. The first connecting side surface 313 and the second connecting side surface 314 are connected to the outer connecting surface 312 and the inner connecting surface 311.

[0088] like Figure 7 As shown, the connecting portion 31 also includes a through hole 315. The through hole 315 extends through the connecting inner surface 311 and the connecting outer surface 312 of the connecting portion 31. The through hole 315 is used for the pole body 42 to pass through. The shape of the through hole 315 matches the shape of the pole body 42. This application does not impose any limitations.

[0089] The connecting portion 31 also includes a vent groove 316. The vent groove 316 is recessed on the connecting outer surface 312 of the connecting portion 31 and is recessed towards the connecting inner surface 311. The vent groove 316 surrounds the periphery of the through hole 315. The vent groove 316 communicates with the through hole 315. The vent groove 316 includes a side wall surface 316a and a bottom wall surface 316b. The orientation of the bottom wall surface 316b is the same as the orientation of the connecting outer surface 312 of the connecting portion 31. The side wall surface 316a surrounds the periphery of the bottom wall surface 316b, and the side wall surface 316a connects with the bottom wall surface 316b and the connecting outer surface 312, and the side wall surface 316a, bottom wall surface 316b, and connecting outer surface 312 are all at an angle. In this embodiment, the vent groove 316 is approximately an annular groove. Both the side wall surface 316a and the bottom wall surface 316b of the vent groove 316 are annular surfaces. The ratio of the depth of the vent groove 316 to the thickness of the connecting portion 31 is greater than or equal to 0.025 and less than or equal to 0.33. The width of the vent groove 316 satisfies the width of the weld seam generated by welding the pole post 40 and the pin 30. The depth of the vent groove 316 is the straight-line distance between the bottom wall surface 316b of the vent groove 316 and the outer connecting surface 312 of the connecting portion 31. The width of the vent groove 316 is the radial width of the bottom wall surface 316b of the vent groove 316.

[0090] The connecting portion 31 also includes a first exhaust groove 317 and a second exhaust groove 318. Both the first exhaust groove 317 and the second exhaust groove 318 are recessed outside the connecting surface 312 of the connecting portion 31 and are recessed towards the connecting portion 31. Both the first exhaust groove 317 and the second exhaust groove 318 extend along the width direction of the connecting portion 31. The first exhaust groove 317 and the second exhaust groove 318 are located on opposite sides of the venting groove 316 in the radial direction. Both the first exhaust groove 317 and the second exhaust groove 318 communicate with the venting groove 316.

[0091] The first exhaust groove 317 extends through the side wall 316a of the vent groove 316 and the first connecting side 313 of the connecting portion 31. That is, the first exhaust groove 317 has two openings, which are located on the side wall 316a and the first connecting side 313, respectively.

[0092] The second exhaust groove 318 extends through the side wall 316a of the vent groove 316 and the second connecting side 314 of the connecting portion 31. That is, the second exhaust groove 318 has two openings, which are located on the side wall 316a and the second connecting side 314, respectively.

[0093] In this embodiment, the first vent groove 317 and the second vent groove 318 are symmetrically arranged about the central axis of the length direction (Y-axis direction) of the connecting portion 31, and also symmetrically arranged about the central axis of the width direction (X-axis direction) of the connecting portion 31. The structures of the first vent groove 317 and the second vent groove 318 are substantially the same. Both the first vent groove 317 and the second vent groove 318 are rectangular open grooves. The depths of the first vent groove 317 and the second vent groove 318 are the same as the depth of the vent groove 316. The depths of the first vent groove 317 and the second vent groove 318 are both greater than or equal to 0.1 mm and less than or equal to 1 mm, to avoid the depths of the first vent groove 317 and the second vent groove 318 affecting the welding strength between the pin 30 and the electrode post 40 and the current carrying capacity of the pin 30. The widths of the first vent groove 317 and the second vent groove 318 are both greater than or equal to the weld width of the molten pool generated by welding the electrode post 40 and the pin 30, to prevent the molten pool from climbing onto the outer surface 312 of the connecting portion 31.

[0094] The connecting portion 31 also includes a positioning hole 319. The positioning hole 319 is located on the side of the vent groove 316 facing away from the through hole 315, and is positioned to avoid the vent groove 316, the first exhaust groove 317, and the second exhaust groove 318. The positioning hole 319 extends through the connecting inner surface 311 and the connecting outer surface 312 of the connecting portion 31. The positioning hole 319 is used for the positioning post 26 of the lower plastic 20 to pass through. The number of positioning holes 319 is the same as the number of positioning posts 26. The shape of the positioning hole 319 matches the shape of the positioning post 26. In this embodiment, the positioning hole 319 is approximately circular. The number of positioning holes 319 is one. In some embodiments, the number of positioning holes 319 may also be multiple. Each positioning hole 319 is used for one positioning post 26 to pass through.

[0095] like Figure 5 As shown, the connecting portion 31 also includes a clearance annular groove 320. The clearance annular groove 320 is recessed within the connecting inner surface 311 of the connecting portion 31 and is recessed towards the connecting outer surface 312. The clearance annular groove 320 surrounds the periphery of the through hole 315 and communicates with the through hole 315. The clearance annular groove 320 includes a groove bottom surface 241, which forms part of the groove wall surface of the clearance annular groove 320. The orientation of the groove bottom surface 241 is the same as the orientation of the connecting inner surface 311 of the connecting portion 31. The groove bottom surface 241 of the clearance annular groove 320 connects to the hole wall surface of the through hole 315 and is set at an angle to the hole wall surface of the through hole 315. The groove bottom surface 241 surrounds the periphery of the through hole 315. The clearance annular groove 320 is used to mate with the extension 52 of the upper plastic 50 and the electrode body 42 of the electrode post 40. In this embodiment, the clearance groove 320 is an annular groove. The bottom surface 241 of the clearance groove 320 is an annular surface.

[0096] In this embodiment, the adapter 33 is a rectangular sheet. The adapter 33 includes an inner surface 331 and an outer surface 332. The inner surface 331 and the outer surface 332 are arranged opposite to each other along the thickness direction (Y-axis direction) of the adapter 33. The outer surface 332 is connected to the inner connecting surface 311 of the connecting part 31 and is arranged at an angle to the inner connecting surface 311. The outer surface 332 is used to connect with the tab 220. The inner surface 331 is connected to the outer connecting surface 312 of the connecting part 31 and is arranged at an angle to the outer connecting surface 312. The inner surface 331 is used to connect with part of the heat insulation member 70.

[0097] Please refer to the following: Figure 4 , Figure 8 and Figure 9 , Figure 8 for Figure 5 The diagram shows a cross-sectional view of a portion of the end cap assembly. Figure 9 for Figure 8 The diagram shows a cross-sectional view of part of the end cap assembly and the insulation component.

[0098] like Figure 8 As shown, in this embodiment, the end cap body 10 and the lower plastic 20 are stacked and connected along the thickness direction of the end cap assembly 100. The lower surface 12 of the end cap body 10 is connected to the top surface 211 of the lower plastic 20. The first pole post through hole 13 of the end cap body 10 and the second pole post through hole 25 of the lower plastic 20 are coaxially arranged and connected. The diameter of the second pole post through hole 25 is larger than the diameter of the first pole post through hole 13, such that there is a certain gap between the hole wall of the second pole post through hole 25 and the periphery of the first pole post through hole 13, the gap being for subsequent assembly of the sealing ring 60.

[0099] The upper plastic 50 is fitted onto the electrode body 42 of the electrode post 40. The electrode post 40 with the upper plastic 50 fitted onto it and the upper plastic 50 pass sequentially through the first electrode post through hole 13 and the second electrode post through hole 25 of the lower plastic 20 in the end cap body 10. The electrode post 40 abuts the upper plastic 50 against the upper surface 11 of the end cap body 10 and the wall of the first electrode post through hole 13. Specifically, the first through hole 53 of the upper plastic 50 is coaxially arranged with the electrode post 40. The electrode body 42 of the electrode post 40 passes through the first through hole 53 of the upper plastic 50. The flange 41 of the electrode post 40 holds the upper plastic body 51 of the upper plastic 50 against the upper surface 11 of the end cap body 10, and the electrode body 42 of the electrode post 40 holds the extension 52 of the upper plastic 50 against the wall of the first electrode post through hole 13 of the end cap body 10. It is understood that the upper plastic body 51 insulates the flange 41 of the pole post 40 from the end cap body 10, and the extension 52 insulates the pole post body 42 of the pole post 40 from the end cap body 10, thereby achieving insulation between the pole post 40 and the end cap body 10 through the upper plastic 50. A gap is formed between the outer peripheral surface of the extension 52 and the wall of the second pole post through hole 25 of the lower plastic 20, and this gap is used to accommodate the sealing ring 60. The end face of the extension 52 away from the upper plastic body 51 is flush with the first step surface 431 of the pole post body 42.

[0100] A sealing ring 60 is fitted around the outer periphery of the electrode body 42 of the electrode post 40 and the extension 52 of the upper plastic 50. Specifically, the second through hole 61 of the sealing ring 60 is coaxially arranged with the electrode post 40 and the upper plastic 50, and the electrode body 42 of the electrode post 40 and the extension 52 of the upper plastic 50 pass through the second through hole 61 of the sealing ring 60 together. The sealing ring 60 is accommodated in the gap formed by the outer peripheral surface of the extension 52 and the hole wall of the second electrode post through hole 25, and one surface of the sealing ring 60 in the thickness direction abuts against the lower surface 12 of the end cap body 10.

[0101] Pin 30 is mounted on the lower plastic 20 and mates with the sealing ring 60, the terminal post 40, and the upper plastic 50. The connecting portion 31 of pin 30 is housed within the mounting groove 24 of the lower plastic 20. The terminal post 40 passes through the connecting portion 31 and is soldered to the connecting portion 31 for electrical connection. The soldering surface 421 of the terminal post 40 is flush with the bottom wall surface 316b of the vent groove 316, meaning the vent groove 316 surrounds the soldering surface 421. Along the thickness direction of the end cap assembly 100, the transition portion 33 of pin 30 extends away from the mounting groove 24 of the lower plastic 20.

[0102] Specifically, the inner connecting surface 311 of the connecting part 31 faces the bottom surface 241 of the mounting groove 24, and the inner connecting surface 311 of the connecting part 31 is connected to the bottom surface 241 of the mounting groove 24. The first connecting side surface 313 of the connecting part 31 is opposite to the first sub-surface 243 of the mounting groove 24, and one opening of the first venting groove 317 of the connecting part 31 facing away from the venting groove 316 is opposite to and communicates with the first recess 245 of the lower plastic 20. The second connecting side surface 314 of the connecting part 31 is opposite to the second sub-surface 244 of the mounting groove 24, and one opening of the second venting groove 318 of the connecting part 31 facing away from the venting groove 316 is opposite to and communicates with the second recess 246 of the lower plastic 20. The first recess 245 communicates with the venting groove 316 through the first venting groove 317, and the second recess 246 communicates with the venting groove 316 through the second venting groove 318. It can be understood that the first groove 245, the second groove 246, the first exhaust groove 317, the second exhaust groove 318, and the vent groove 316 together constitute an exhaust channel. The exhaust channel provides a flow path for helium gas when the energy storage device 1000 performs helium detection, allowing the helium gas to flow smoothly.

[0103] In this embodiment, the width of the first vent groove 317 is smaller than the width of the first groove 245, and the width of the second vent groove 318 is smaller than the width of the second groove 246. That is, along the width direction of the end cap assembly 100, the projection of the first vent groove 317 is located within the first groove 245, and the projection of the second vent groove 318 is located within the second groove 246.

[0104] Furthermore, the inner surface 311 of the connecting part 31 abuts against the surface of the sealing ring 60 facing away from the end cap body 10. The connecting part 31 presses the sealing ring 60 toward the end cap body 10, causing the sealing ring 60 to elastically deform and thus make an interference fit with the connecting part 31, the lower plastic 20, the extension 52, and the end cap body 10 that form the gap, thereby achieving sealing and insulation of the end cap assembly 100.

[0105] The positioning hole 319 of the connecting part 31 and the positioning post 26 of the lower plastic 20 are coaxially arranged. The positioning post 26 passes through the positioning hole 319 to limit and fix the pin 30 on the lower plastic 20.

[0106] The through hole 315 of the connecting part 31 and the pole post 40 are coaxially arranged. The pole post body 42 passes through the through hole 315 of the connecting part 31, and the step 43 of the pole post body 42 abuts against the clearance annular groove 320 of the connecting part 31. The first step surface 431 of the step 43 abuts against the bottom surface 241 of the clearance annular groove 320. The second step surface 432 of the step 43 abuts against the hole wall of the through hole 315, thereby limiting and fixing the pole post 40 and the lead 30. The welding surface 421 of the pole post body 42 is flush with the bottom wall surface 316b of the vent groove 316 of the connecting part 31 to prevent a height difference between the welding surface 421 of the pole post 40 and the bottom wall surface 316b of the connecting part 31, which could lead to poor welding between the pole post 40 and the lead 30.

[0107] Meanwhile, the end face of the extension 52 away from the upper plastic body 51 abuts against the bottom surface 241 of the clearance annular groove 320. Without affecting the structural strength of the pin 30, a portion of the extension 52 and a portion of the pole body 42 are accommodated within the clearance annular groove 320, which not only reduces the thickness dimension of the end cap assembly 100, but also achieves the limiting and fixing of the upper plastic 50 and the pole 40 with the pin 30, ensuring the structural reliability of the end cap assembly 100.

[0108] Combination Figure 3 , Figure 4 and Figure 9As shown, the width of the first portion 71 of the heat insulation component 70 is greater than or equal to the width of the limiting boss 23. The first portion 71 at least covers the connecting portion 31 of the pin 30, the limiting boss 23 of the lower plastic 20, and the electrode body 42. The first portion 71 separates the connecting portion 31 and the electrode 40 from the battery cell 210 to prevent the high-temperature connecting portion 31 and the electrode 40 from contacting the battery cell 210, which could cause the battery cell 210 to be burned or even short-circuited. Specifically, the first portion 71 is connected to the connecting outer surface 312 of the connecting portion 31 and the boss surface 231 of the limiting boss 23, and the first portion 71 is opposite to and spaced apart from the bottom wall surface 316b of the vent groove 316, the bottom wall of the first exhaust groove 317, the bottom wall of the second exhaust groove 318, the bottom wall of the first groove 245, and the bottom wall of the second groove 246. That is, the first part 71 does not seal the first groove 245, the second groove 246, the vent groove 316, the first exhaust groove 317, and the second exhaust groove 318, meaning the first part 71 does not seal the exhaust channel. This allows helium gas to flow smoothly within the exhaust channel during the helium testing process of the end cap assembly 100, preventing a false seal between the first part 71 and the lower plastic 20 from affecting the test results of the end cap assembly 100 during the helium testing process. This prevents defective end cap assemblies 100 from entering the market, causing customer complaints, or even safety accidents, thus ensuring the safety of the energy storage device 1000. In some embodiments, a portion of the first part 71 of the heat insulation member 70 can be bonded to the surface of the mounting boss 27 facing the limiting boss 23, increasing the bonding area between the heat insulation member 70 and the lower plastic 20, further improving the heat insulation effect of the heat insulation member 70.

[0109] Furthermore, the welding surface 421 of the electrode post 40 is flush with the bottom wall surface 316b of the pin 30. The space enclosed by the vent groove 316 of the electrode post 40 and the pin 30 can accommodate the width of the weld seam generated by the welding of the pin 30 and the electrode post 40. At the same time, a height difference is formed between the first part 71 and the welding point of the electrode post 40 and the pin 30, ensuring that the molten pool generated by the welding of the electrode post 40 and the pin 30 will not pierce the first part 71. This is beneficial for the first part 71 to effectively isolate the cell 210 from the electrode post 40 and the pin 30, ensuring the working performance of the cell 210, and thus ensuring the safety of the energy storage device 1000. In some embodiments, provided that the welding of the electrode post 40 and the pin 30 is good and the molten pool generated by the welding of the electrode post 40 and the pin 30 will not pierce the first part 71, the welding surface 421 of the electrode post 40 may not be flush with the bottom wall surface 316b of the pin 30, but the welding surface 421 of the electrode post 40 and the first part 71 still have a height difference.

[0110] Furthermore, the widths of the first venting groove 317 and the second venting groove 318 are greater than or equal to the molten pool width, ensuring that the molten pool will not climb onto the connection outside 312 of the pin 30, thus guaranteeing the anti-fake sealing effect of the first part 71 connecting the lower plastic 20 and the pin 30.

[0111] The second part 72 of the heat insulation component 70 covers at least the inner side 331 of the adapter 33, and the second part 72 is at least connected to the inner side 331 of the adapter 33, so as to avoid the adapter 33 with high temperature from directly contacting the battery cell 210 and causing the battery cell 210 to be burned or even short-circuited.

[0112] It should be noted that in some embodiments, the connecting portion 31 may further include one or more venting grooves, and correspondingly, the lower plastic 20 may further include one or more recesses. For example, the connecting portion 31 may further include a second venting groove, a fourth venting groove, a fifth venting groove, etc., and correspondingly, the lower plastic 20 may further include a third recess, a fourth recess, a fifth recess, etc. The third recess is opposite to and communicates with the third venting groove. The fourth recess is opposite to and communicates with the fourth venting groove. The fifth recess is opposite to and communicates with the fifth venting groove. This application does not impose any limitations herein.

[0113] In related technologies, to prevent short circuits or even fires and explosions caused by contact between the core and pins 30 and terminals 40, high-temperature adhesive is applied to the surfaces of terminals 40 and pins 30 facing the core to prevent contact. However, due to the presence of the high-temperature adhesive, defects in the welding areas of terminals 40 and pins 30 (such as pinholes and aging cracks) are not easily detected, leading to false seals, reducing the safety of the energy storage device 1000, and affecting the customer's user experience.

[0114] In this embodiment, the perforation 315 of the pin 30 in the end cap assembly 100 is provided with a venting groove 316, a first exhaust groove 317, and a second exhaust groove 318. The lower plastic 20 is provided with a first groove 245 and a second groove 246 corresponding to the positions of the first exhaust groove 317 and the second exhaust groove 318, respectively. The first groove 245 is connected to the venting groove 316 through the first exhaust groove 317. The second groove 246 is connected to the venting groove 316 through the second exhaust groove 318. That is, the first groove 245, the second groove 246, the first exhaust groove 317, the second exhaust groove 318, and the venting groove 316 together constitute an exhaust channel. The first part 71 of the heat insulation component 70 is connected to the lower plastic 20 and the connecting part 31. The first part 71 will not block the exhaust channel, so that helium gas can flow smoothly in the exhaust channel during the helium test of the end cap assembly 100. This effectively detects whether there are defects at the welding joint of the pole post 40 and the pin 30, and avoids the formation of a false seal between the first part 71 and the lower plastic 20, which would affect the test results of the end cap assembly 100 during the helium test. This prevents defective end cap assemblies 100 from entering the market, causing customer complaints or even safety accidents, thus ensuring the safety of the energy storage device 1000 and improving the customer's user experience.

[0115] Furthermore, the welding surface 421 of the pole post 40 is flush with the bottom wall surface 316b of the vent groove 316. When the first part 71 of the heat insulation component 70 is connected to the connecting part 31, it not only avoids poor welding of the pole post 40 and the pin 30, but also prevents the weld from piercing the first part 71 and affecting the performance of the first part 71.

[0116] Please see Figure 10 and Figure 11 , Figure 10 for Figure 3 The diagram shows a structural schematic of a second embodiment of the end cap assembly of the energy storage device at one angle. Figure 11 for Figure 10 A partially enlarged schematic diagram of the M region of the pins of the end cap assembly shown.

[0117] Unlike the structure of the end cap assembly 100 in the first embodiment described above, the structures of the pole post 40 and the pin 30 have changed in this embodiment.

[0118] like Figure 10 As shown, in this embodiment, the pole post 40 further includes a recess 44 and a pole post protrusion 45. The recess 44 and the pole post protrusion 45 are formed by stamping the pole post 40. The recess 44 is recessed into the welding surface 421 of the pole post body 42 and is recessed towards the flange 41. The pole post protrusion 45 protrudes from the welding surface 421 of the pole post body 42. Along the radial direction of the pole post body 42, the pole post protrusion 45 is located between the step 43 and the recess 44. The pole post protrusion 45 and the step 43 are spaced apart, and the pole post protrusion 45 surrounds and connects to the periphery of the recess 44.

[0119] The pole post protrusion 45 includes a first adhesive surface 46. The first adhesive surface 46 faces away from the pole post body 42, and the orientation of the first adhesive surface 46 is the same as that of the welding surface 421. The first adhesive surface 46 is disposed along the periphery of the welding surface 421. The first adhesive surface 46 is used to connect with the first portion 71 of the heat insulation member 70. The pole post protrusion 45 also includes an outer annular surface 47 and an inner annular surface 48. The outer annular surface 47 and the inner annular surface 48 are disposed opposite to each other along the radial direction of the pole post protrusion 45. The outer annular surface 47 is connected to the welding surface 421 of the pole post body 42 and is disposed at an angle to the welding surface 421. The inner annular surface 48 faces the recess 44 and forms part of the sidewall of the recess 44. In this embodiment, the recess 44 is generally a circular groove. The pole post protrusion 45 is generally an annular protrusion. The height of the pole post protrusion 45 is greater than or equal to 0.1 mm and less than or equal to 1 mm. The height of the pole post protrusion 45 is the distance from the first bonding surface 46 to the welding surface 421.

[0120] like Figure 10 and Figure 11As shown, in this embodiment, the pin 30 further includes a pin protrusion 34. The pin protrusion 34 protrudes from the outer surface 312 of the connecting portion 31. The pin protrusion 34 is disposed around the periphery of the through hole 315 and spaced apart from the through hole 315. The pin protrusion 34 includes a second adhesive surface 341. The second adhesive surface 341 faces away from the connecting portion 31, and the orientation of the second adhesive surface 341 is the same as the orientation of the outer surface 312. The pin protrusion 34 and the connecting portion 31 form a first venting groove 317, a second venting groove 318, and a venting groove 316. In this embodiment, the pin protrusion 34 is formed by extrusion molding, that is, the pin protrusion 34 is formed by extruding the avoidance ring groove 320 of the connecting portion 31 and protruding from the outer surface 312 of the connecting portion 31. Alternatively, the second adhesive surface 341 constitutes part of the connecting outer surface 312 of the connecting portion 31, and the first vent groove 317, the second vent groove 318 and the vent groove 316 are all recessed on the connecting outer surface 312 of the connecting portion.

[0121] The pin protrusion 34 includes a surrounding section 35, a first extension section 36, and a second extension section 37. The surrounding section 35 is disposed around the periphery of the through hole 315 and spaced apart from the periphery of the through hole 315. The first extension section 36 and the second extension section 37 are respectively connected to opposite ends in the radial direction of the surrounding section 35, and the first extension section 36 and the second extension section 37 extend in opposite directions. In this embodiment, the surrounding section 35 is generally an annular protrusion. The first extension section 36 and the second extension section 37 are generally strip-shaped protrusions. Figure 11 As shown, the first extension segment 36, the second extension segment 37, and the surrounding segment 35 are symmetrically arranged about the central axis of the perforation 315.

[0122] The surrounding section 35 includes two arc-shaped sections 351. In this embodiment, the two arc-shaped sections 351 are approximately semi-circular protrusions. The two arc-shaped sections 351 are positioned opposite each other along the Y-axis and spaced apart. The arc-shaped curvature directions of the two arc-shaped sections 351 are opposite. The two arc-shaped sections 351 surround the periphery of the perforation 315, and both arc-shaped sections 351 are spaced apart from the periphery of the perforation 315. The two arc-shaped sections 351 and the connecting portion 31 form a venting groove 316. The venting groove 316 is coaxially arranged with and communicates with the perforation 315. The two opposing surfaces of the two arc-shaped sections 351 form the sidewall surface 316a of the venting groove 316. The portion located between the perforation 315 and the two arc-shaped sections 351 connects to the outer surface 312 to form the bottom wall surface 316b of the venting groove 316.

[0123] The first extension 36 includes two first sub-segments 361. In this embodiment, both first sub-segments 361 are strip-shaped protrusions. The two first sub-segments 361 are spaced apart along the Y-axis, and the two first sub-segments 361 and the connecting portion 31 form a first exhaust groove 317. The two opposing surfaces of the two first sub-segments 361 and the portion between the two first sub-segments 361 are connected to the outer surface 312 to form the wall of the first exhaust groove 317. Each first sub-segment 361 is connected to an arc-shaped segment 351, and both first sub-segments 361 extend away from the arc-shaped segment 351. The ends of both first sub-segments 361 away from the arc-shaped segment 351 are connected to the first connecting side surface 313 of the connecting portion 31.

[0124] The second extension 37 includes two second sub-segments 371. In this embodiment, both second sub-segments 371 are strip-shaped protrusions. The two second sub-segments 371 are spaced apart along the Y-axis, and the two second sub-segments 371 and the connecting portion 31 form a second exhaust groove 318. The two opposing surfaces of the two second sub-segments 371 and the portion between the two second sub-segments 371 are connected to the outer surface 312 to form the wall of the second exhaust groove 318. Each second sub-segment 371 is connected to an arc-shaped segment 351, and both second sub-segments 371 extend away from the arc-shaped segment 351. The ends of both second sub-segments 371 away from the arc-shaped segment 351 are connected to the second connecting side surface 314 of the connecting portion 31.

[0125] In this embodiment, a first sub-segment 361 and a second sub-segment 371 are respectively connected to opposite ends of an arc segment 351 along its arc length. The first sub-segment 361 and the second sub-segment 371 extend in opposite directions. The first exhaust groove 317 formed by the first extension segment 36 and the second exhaust groove 318 formed by the second extension segment 37 are both connected to the ventilation groove 316 formed by the surrounding segment 35.

[0126] It should be noted that, in this embodiment, the contents that are the same as those in the first embodiment described above will not be repeated.

[0127] Please refer to the following: Figure 10 , Figure 12 and Figure 13 , Figure 12 for Figure 10 The diagram shows a cross-sectional view of a portion of the end cap assembly. Figure 13 for Figure 12 The diagram shows a cross-sectional view of part of the end cap assembly and the insulation component.

[0128] In this embodiment, the connection portion 31 of the pin 30 is accommodated within the mounting groove 24 of the lower plastic 20. The adapter portion 33 of the pin 30 extends away from the lower plastic 20. Figure 10 and Figure 12As shown, the inner connecting surface 311 of the connecting portion 31 is connected to the bottom surface 241 of the mounting groove 24. Along the X-axis, the first connecting side surface 313 of the connecting portion 31 is opposite to the first sub-surface 243 of the mounting groove 24, and the end of the first extension segment 36 facing away from the surrounding segment 35 is opposite to and spaced apart from the first groove 245 of the lower plastic 20. The first venting groove 317 formed by the first extension segment 36 communicates with the first groove 245. The second connecting side surface 314 of the connecting portion 31 is opposite to the second sub-surface 244 of the mounting groove 24, and the end of the second extension segment 37 facing away from the surrounding segment 35 is opposite to and spaced apart from the second groove 246 of the lower plastic 20. The second venting groove 318 formed by the second extension segment 37 communicates with the second groove 246.

[0129] The first groove 245, the second groove 246, the first exhaust groove 317, the second exhaust groove 318 are connected to the venting groove 316.

[0130] The electrode body 42 passes through the through hole 315 of the connecting part 31. The lead protrusion 34 is arranged around the periphery of the electrode protrusion 45. The opposing surfaces of the two arcuate segments 351 of the lead protrusion 34 are spaced apart from the outer annular surface 47 of the electrode protrusion 45. Alternatively, the vent groove 316 is arranged around the periphery of the electrode protrusion 45 and the electrode body 42. In this embodiment, the sidewall surface 316a of the vent groove 316 faces the outer annular surface 47 of the electrode protrusion 45 and is opposite to and spaced apart from the outer annular surface 47. The bottom wall surface 316b of the vent groove 316 is flush with the welding surface 421 of the electrode body 42. The first bonding surface 46 of the electrode protrusion 45 is flush with the second bonding surface 341 of the lead protrusion 34. The outer annular surface 47 of the pole post protrusion 45, the welding surface 421 of the pole post body 42, the bottom wall surface 316b and the side wall surface 316a of the vent groove 316 together form an exhaust channel to provide a flow path for helium gas in the energy storage device 1000 during the helium detection process. In some embodiments, the first bonding surface 46 of the pole post protrusion 45 and the second bonding surface 341 of the lead protrusion 34 may not be flush, as long as the pole post protrusion 45 and the lead protrusion 34 can lift the first part 71, so that the first part 71 is separated from the outer connecting surface 312 of the connecting part 31 and the welding surface 421 of the pole post 40.

[0131] Furthermore, the step 43 of the electrode body 42 abuts against the clearance annular groove 320 of the connecting portion 31. The first step surface 431 of the step 43 abuts against the bottom surface 241 of the clearance annular groove 320. The second step surface 432 of the step 43 abuts against the wall of the through hole 315, thereby limiting and fixing the electrode 40 and the pin 30. The welding surface 421 of the electrode body 42 is flush with the second connecting surface of the connecting portion 31, thereby limiting and fixing the electrode 40 and the pin 30.

[0132] Combination Figure 12 and Figure 13As shown, the first portion 71 of the heat insulation component 70 at least covers the connecting portion 31 of the pin 30, the limiting boss 23 of the lower plastic 20, and the electrode post 40. The first portion 71 separates the connecting portion 31 and the electrode post 40 from the battery cell 210 to prevent the high-temperature connecting portion 31 and the electrode post 40 from contacting the battery cell 210 and causing the battery cell 210 to be burned or even short-circuited. The first portion 71 is connected to the second adhesive surface 341 of the pin protrusion 34, the boss surface 231 of the limiting boss 23, and the first adhesive surface 46 of the electrode post protrusion 45, and the first portion 71 is opposite to and spaced apart from the second connecting surface of the connecting portion 31 and the welding surface 421 of the electrode post body 42. The pole post protrusion 45 and the pin protrusion 34 lift the first part 71, so that the first part 71 and the second connecting surface and welding surface 421 form a height difference. The first part 71 does not seal the exhaust channel, so that helium can flow smoothly in the exhaust channel during the helium detection process of the end cap assembly 100, effectively detecting whether there are defects at the welding point of the pole post 40 and the pin 30, so as to prevent defective end cap assemblies 100 from entering the market, causing customer complaints or even safety accidents, and ensuring the safe use of the energy storage device 1000.

[0133] Moreover, the height difference between the first part 71 and the second connecting surface and welding surface 421 ensures that the molten pool generated by the welding of the pole post 40 and the pin 30 will not pierce the first part 71. This helps the first part 71 to effectively isolate the cell 210 from the pole post 40 and the pin 30, ensuring the working performance of the cell 210 and thus ensuring the safety of the energy storage device 1000.

[0134] It should be noted that in this embodiment, the connection relationship and effect between components with the same structure as in the first embodiment described above will not be repeated here.

[0135] The above are merely some embodiments and implementation methods of this application. 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. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An end cap assembly, characterized in that, The end cap assembly includes: End cap body; The lower plastic body includes a lower plastic body and a limiting boss. The limiting boss protrudes from one surface of the lower plastic body in the thickness direction and is located at one end of the lower plastic body in the length direction. The limiting boss includes a boss surface facing away from the lower plastic body. The lower plastic body also includes an assembly groove and a recess. The assembly groove is recessed in the boss surface and includes a groove circumferential surface. The groove circumferential surface is connected to the boss surface and is set at an angle to the boss surface. The recess is recessed in the boss surface and penetrates the outer circumferential surface of the limiting boss and the groove circumferential surface. The recess is located outside the assembly groove and communicates with the assembly groove. A pin, the pin including a connecting portion, the connecting portion being received within the mounting slot; The connecting part includes a through hole that extends through both surfaces of the connecting part in the thickness direction. The connecting part also includes a vent groove and an exhaust groove. Both the vent groove and the exhaust groove are recessed on the surface of the connecting part in the thickness direction facing away from the mounting groove. The vent groove is arranged around the periphery of the through hole and communicates with the through hole. The exhaust groove is connected to the outer periphery of the vent groove and communicates with the vent groove. The exhaust groove is opposite to and communicates with the groove. The electrode post is stacked with the lower plastic and the end cap body along the thickness direction of the end cap assembly. The electrode post is sequentially inserted through the holes of the end cap body, the lower plastic and the connecting part, and is welded to the connecting part for conduction. A heat insulation component is stacked on the side of the pin facing away from the lower plastic. The heat insulation component includes a first part, which at least covers the limiting boss, the connecting part, and the pole post. Along the thickness direction of the end cap assembly, the first part is spaced apart from the bottom surface of the vent groove, the bottom wall of the exhaust groove, and the bottom wall of the recess. The first part is also spaced apart from the welding joints of the pole post and the connecting part.

2. The end cap assembly according to claim 1, characterized in that, There are two grooves, namely a first groove and a second groove, and there are two exhaust channels, namely a first exhaust channel and a second exhaust channel. The first exhaust channel and the first groove are opposite to and connected to each other, and the second exhaust channel and the second groove are opposite to and connected to each other.

3. The end cap assembly according to claim 2, characterized in that, The limiting boss includes a first side and a second side facing away from each other. The first side and the second side are connected to the boss surface and are arranged opposite to each other along the width direction of the limiting boss. The groove peripheral surface includes a first sub-surface and a second sub-surface. The first sub-surface and the second sub-surface are arranged opposite to each other along the width direction of the assembly groove. The orientation of the first side is the same as the orientation of the second sub-surface. The first groove extends through the first side surface and the first sub-surface, and the second groove extends through the second side surface and the second sub-surface, with the first groove and the second groove being disposed opposite to each other.

4. The end cap assembly according to claim 3, characterized in that, The connecting portion includes a first connecting side and a second connecting side, the first connecting side and the second connecting side are arranged opposite to each other along the width direction of the connecting portion, the first exhaust groove passes through the first connecting side, and the second exhaust groove passes through the second connecting side; The first exhaust groove and the second exhaust groove are symmetrically arranged about the central axis of the length direction of the connecting part. Along the width direction of the end cap assembly, the projection of the first exhaust groove is located within the projection of the first groove, and the projection of the second exhaust groove is located within the projection of the second groove.

5. The end cap assembly according to claim 2, characterized in that, The pole also includes a pole body and a flange. The pole body is connected to one side of the flange in the height direction. A pole protrusion is provided on the side of the pole body away from the flange. The pole protrusion is arranged along the periphery of the pole body. The pole protrusion includes a first adhesive surface, which faces away from the pole body. The pin also includes a pin protrusion, which protrudes from the surface of the connecting portion facing away from the mounting groove in the thickness direction. The pin protrusion surrounds the through hole and forms the vent groove, the first exhaust groove and the second exhaust groove. The pin protrusion includes a second adhesive surface, which faces the same direction as the first adhesive surface. The first part is connected to the first adhesive surface and the second adhesive surface.

6. The end cap assembly according to claim 5, characterized in that, The height of the pole post protrusion is greater than or equal to 0.1 mm and less than or equal to 1 mm.

7. The end cap assembly according to any one of claims 1-6, characterized in that, The pole includes a welding surface, which is flush with the bottom wall of the venting groove, and the welding surface is opposite to and spaced apart from the first part.

8. The end cap assembly according to any one of claims 1-6, characterized in that, The connecting part further includes a clearance ring groove, which is recessed on the surface of the connecting part facing the assembly groove. A portion of the pole post is accommodated in the clearance ring groove and abuts against the groove wall surface of the clearance ring groove.

9. The end cap assembly according to any one of claims 1-6, characterized in that, The pin also includes an adapter portion, which is connected to the connecting portion and is set at an angle to the connecting portion, and the adapter portion extends away from the lower plastic. The heat insulation component further includes a second part, which is connected to the first part and is disposed at an angle to the first part, and the second part at least covers the surface of the adapter facing the connection part.

10. The end cap assembly according to any one of claims 1-6, characterized in that, The ratio of the depth of the ventilation groove to the thickness of the connecting part is greater than or equal to 0.025 and less than or equal to 0.

33.

11. The end cap assembly according to any one of claims 2-6, characterized in that, The widths of the first venting groove and the second venting groove are both greater than or equal to the weld width of the molten pool formed by welding the pole and the connecting part.

12. The end cap assembly according to any one of claims 1-6, characterized in that, The heat insulation component is made of high-temperature adhesive.

13. An energy storage device, characterized in that, The energy storage device includes a housing, an electrode assembly, and an end cap assembly as described in any one of claims 1-12. The housing includes an opening, the electrode assembly is housed within the housing, the electrode assembly includes a battery cell and a tab, the tab is electrically connected to the battery cell, the end cap assembly seals the opening, the adapter portion of the pin is stacked with the tab and welded to the tab for conduction, a first portion of the heat insulation member is located between the connecting portion and the battery cell, and a second portion of the heat insulation member is located between the adapter portion and the battery cell.

14. An electrical appliance, characterized in that, The electrical equipment includes the energy storage device as described in claim 13, the energy storage device being used to supply power to the electrical equipment.

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