End cover assembly, energy storage device and electric equipment

Abstract

The utility model discloses an end cover assembly, an energy storage device and electric equipment, and relates to the technical field of energy storage. The end cover assembly comprises a cover plate; the electrode column comprises a pressing block, a columnar body and a flange, the pressing block is located on the first side of the cover plate and provided with a first through hole, the first end of the columnar body penetrates through the mounting hole of the cover plate and is limited in the first through hole, the hole wall of the first through hole and / or the side wall of the first end is provided with an air guide groove, and the air guide groove is communicated with the mounting hole; the first side of the cover plate is communicated with the external environment; the first insulating part is located between the cover plate and the pressing block; and the sealing piece is sleeved on the columnar body. In the embodiment of the invention, the mounting hole in the cover plate is communicated with the external environment of the first side of the cover plate through the gas guide groove formed in the hole wall of the first through hole and / or the side wall of the first end part, so that after the opening of the shell is sealed by the end cover assembly, the detection gas can still flow out of the energy storage device along the mounting hole in the cover plate and the gas guide groove; therefore, the reliability of air tightness detection is ensured.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an end cover assembly, an energy storage device, and an electrical equipment. Background Art

[0002] Rechargeable batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged after discharge to reactivate their active materials and continue to be used. Their recyclable nature has made them a key source of power for electrical devices. As demand for rechargeable batteries grows, so too are the demands placed on their performance, particularly their lifespan.

[0003] Among them, secondary batteries usually include a shell, an electrode assembly and an end cover assembly. The end cover assembly includes a cover plate, an electrode column, a sealing ring and an upper plastic. The electrode assembly is located in the shell, the cover plate seals the opening of the shell, and the electrode column passes through the sealing ring, the cover plate and the upper plastic, and is limited on the cover plate by riveting.

[0004] During the production process of secondary batteries, they are usually subject to airtightness testing. However, due to the large riveting force of the electrode column, the upper plastic is clamped by the riveted pressure block and cover plate, forming a pseudo-seal for a short period of time. As a result, it cannot be effectively identified during the airtightness test, thereby affecting the production yield of the secondary battery and posing a huge safety hazard to the use of the secondary battery. Utility Model Content

[0005] A main purpose of the present application is to provide an end cover assembly, an energy storage device and an electrical equipment that can improve the manufacturing yield of the energy storage device and reduce safety hazards.

[0006] To achieve the above application objectives, this application adopts the following technical solutions:

[0007] According to one aspect of the present application, an end cap assembly is provided, comprising: a cover plate having a through mounting hole; an electrode column comprising a pressing block and a columnar body, the pressing block being located on a first side of the cover plate and having a through first through hole, the first end of the columnar body passing through the mounting hole and being limited in the first through hole, the second end of the columnar body being limited on the second side of the cover plate, the hole wall of the first through hole and / or the side wall of the first end having an air guide groove, the two ends of the air guide groove being respectively connected to the mounting hole and the external environment of the first side of the cover plate; a first insulating member, the first insulating member being sleeved on the columnar body and being located between the cover plate and the pressing block; a sealing member being sleeved on the columnar body and being located between the columnar body and the cover plate.

[0008] In the embodiment of the present application, the mounting hole on the cover plate is connected to the external environment on the first side of the cover plate through the air guide groove provided on the hole wall of the first through hole on the pressing block and / or the side wall of the first end portion on the columnar body. Therefore, after the end cover assembly seals the opening of the shell, the detection gas can still flow out of the energy storage device along the mounting hole and the air guide groove on the cover plate, thereby ensuring the reliability of the air tightness detection.

[0009] According to one embodiment of the present application, the hole wall of the first through hole has a first step surface facing away from the cover plate, the side wall of the first end has a second step surface facing the second end, and the first step surface and the second step surface are in contact with each other.

[0010] According to one embodiment of the present application, the first through hole includes a small-aperture section located on the side of the first step surface close to the cover plate and a large-aperture section located on the side of the first step surface away from the cover plate; the small-aperture wall of the small-aperture section and / or the large-aperture wall of the large-aperture section have a first air guide groove, and the first air guide groove and the side wall of the second end form the air guide channel.

[0011] In an embodiment of the present application, based on the gap between the hole wall of the first through hole and the side wall of the first end, a first air guide groove is set on the small-diameter hole wall and / or the large-diameter hole wall to form an air guide channel through the first air guide groove and the side wall of the first end, thereby ensuring the connection between the mounting hole on the cover plate and the external environment on the side of the cover plate close to the pressing block, so as to effectively ensure the reliability of the air tightness detection.

[0012] According to one embodiment of the present application, the small-diameter hole wall has the first air guide groove, the large-diameter hole wall and the side wall of the first end form a first gap, and the two ends of the first air guide groove are respectively connected to the mounting hole and the first gap.

[0013] According to one embodiment of the present application, the first step surface has a second air guide groove; the small-diameter hole wall and the large-diameter hole wall both have the first air guide groove, and the second air guide groove is respectively connected to the first air guide grooves on the small-diameter hole wall and the large-diameter hole wall.

[0014] In the embodiment of the present application, the second air guide groove provided on the first step surface and the first air guide groove provided on the small-diameter hole wall and the large-diameter hole wall are used to ensure the reliability of the connection between the mounting hole on the cover plate and the external environment on the side of the cover plate close to the pressing block, thereby ensuring the reliability of the air tightness detection.

[0015] According to one embodiment of the present application, the side wall of the second end of the columnar body has an air guide groove; the air guide groove extends along the axial direction of the columnar body to the end face edge of the columnar body away from the flange, and the air guide groove and the hole wall of the first through hole form the air guide channel.

[0016] According to an embodiment of the present application, the surface of the first insulating member facing away from the pressing block has a convex ring, which is arranged around the periphery of the columnar body and located between the hole wall of the mounting hole and the side wall of the columnar body.

[0017] In the embodiment of the present application, by setting the convex ring on the first insulating part, on the basis of the cylindrical body included in the sealing part, the hole wall of the mounting hole on the cover plate and the side wall of the columnar body are further isolated, thereby effectively avoiding the situation where electrical conduction and short circuit occur between the cover plate and the columnar body.

[0018] According to one embodiment of the present application, the seal includes a cylindrical body and a first sealing portion connected to one axial end of the cylindrical body; the cylindrical body is sleeved on the columnar body, the first sealing portion is clamped between the columnar body and the second side surface of the cover plate, and the convex ring abuts against the cylindrical body.

[0019] In the embodiment of the present application, the provision of the first sealing portion on the sealing member facilitates the sealed assembly of the electrode column on the cover plate, and the provision of the cylindrical body on the sealing member, as well as the abutment between the cylindrical body and the convex ring, thereby achieving isolation between the hole wall of the mounting hole and the columnar body, thereby effectively avoiding electrical conduction and short circuit between the cover plate and the columnar body.

[0020] According to one embodiment of the present application, the seal includes a cylindrical body, and a first sealing portion and a second sealing portion connected to both ends of the cylindrical body along the axial direction; the cylindrical body is sleeved on the columnar body, and a second gap is formed between the inner wall of the cylindrical body and the side wall of the columnar body, the second gap is connected to the air guide groove, the first sealing portion is clamped between the columnar body and the second side surface of the cover plate, and the second sealing portion is clamped between the pressure block and the first side surface of the cover plate.

[0021] In the embodiment of the present application, the provision of the second sealing portion facilitates the sealing of the gap between the pressure block and the cover plate, thereby ensuring the reliability of the sealing of the columnar body on the cover plate; at the same time, the cylindrical body included in the seal can completely achieve isolation between the hole wall of the mounting hole and the columnar body, thereby effectively avoiding the occurrence of electrical conduction and short circuit between the cover plate and the columnar body; furthermore, the second gap formed between the cylindrical body and the columnar body ensures that the detection gas can flow out along the mounting hole to the external environment on the first side of the cover plate, thereby facilitating the reliability of airtightness detection.

[0022] According to one aspect of the present application, there is provided an energy storage device, comprising:

[0023] The shell includes a housing cavity with an opening; the electrode assembly is accommodated in the housing cavity; the end cap assembly described in the above aspect seals the opening of the housing cavity.

[0024] In the embodiment of the present application, combined with the end cover assembly described above, the reliability of the airtightness detection of the energy storage device can be ensured in the event that the sealing ring is missing or fails, thereby improving the manufacturing yield of the energy storage device and reducing the safety hazards of the energy storage device during use.

[0025] According to one aspect of the present application, an electric device is provided, which includes the energy storage device described in the above aspect, and the energy storage device supplies power to the electric device.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0028] Figure 1 is a schematic diagram showing an energy storage system according to an exemplary embodiment.

[0029] Figure 2 is a schematic cross-sectional structural diagram of an energy storage device according to an exemplary embodiment.

[0030] Figure 3 is a schematic cross-sectional structural diagram of an end cover assembly according to an exemplary embodiment.

[0031] Figure 4 is a schematic diagram of an exploded structure of an end cover assembly according to an exemplary embodiment.

[0032] Figure 5 yes Figure 3 A partially enlarged structural schematic diagram of the end cover assembly is shown.

[0033] Figure 6 Another end cap assembly according to an exemplary embodiment is shown along Figure 3 Schematic diagram of the enlarged structure of the local area shown.

[0034] Figure 7 FIG2 is a schematic cross-sectional structural diagram of another end cover assembly according to an exemplary embodiment.

[0035] Figure 8 yes Figure 7 A partially enlarged structural schematic diagram of the end cover assembly is shown.

[0036] Figure 9 It is a schematic structural diagram of an electric device according to an exemplary embodiment.

[0037] The description of the accompanying drawings is as follows:

[0038] 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment;

[0039] 10. Shell; 20. Electrode assembly; 30. End cap assembly;

[0040] 11. Accommodating cavity;

[0041] 31. Cover plate; 32. Electrode column; 33. First insulating member; 34. Sealing member;

[0042] 311, mounting hole; 312, main body plate; 313, second insulating member;

[0043] 321, pressing block; 322, columnar body; 323, first through hole; 324, first end; 325, second end; 326, air guide groove; 327, second step surface;

[0044] 3231, first step surface; 3232, small-diameter hole wall; 3233, large-diameter hole wall; 3234, first air guide groove; 3235, first gap; 3236, second air guide groove;

[0045] 331, convex ring; 332, second through hole; 333, limiting groove;

[0046] 341. Cylindrical body; 342. First sealing portion; 343. Second sealing portion; 344. Second gap. DETAILED DESCRIPTION

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0048] Since the energy people need is highly temporal and spatial, in order to make rational use of energy and improve utilization rate, it is necessary to use a medium or equipment to store one form of energy in the same energy form, or convert it into another form of energy, and then release it in a specific energy form based on future applications.

[0049] At present, green energy mainly includes solar energy, wind energy, etc., which generally have the problems of strong intermittency and large volatility, which will cause the voltage of the green power grid to be unstable (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0050] To address the issue of insufficient electricity demand or insufficient grid capacity, energy storage devices are essential. These devices convert electrical energy into other forms of energy through physical or chemical means, storing it. When needed, the stored energy is converted back into electricity and released. Simply put, an energy storage device acts like a large "power bank," storing electricity when there's sufficient solar or wind energy and releasing it when needed.

[0051] Currently, energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0052] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0053] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period; during the peak electricity price period, the electricity in the energy storage device is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0054] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store or supply electric energy through the energy storage device.

[0055] Taking the household energy storage scenario in user-side energy storage as an example, Figure 1The schematic diagram of an energy storage system provided by an embodiment of the present application is shown. The energy storage system includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, household appliance, etc.). The electric energy conversion device 200 is electrically connected to the energy storage device 100, and the energy storage device 100 is electrically connected to the user load 300. The energy storage device 100 is a small energy storage box that can be mounted on an outdoor wall by wall-mounting. Specifically, the electric energy conversion device 200 can convert solar energy into electrical energy and store it through the energy storage device 100, and then supply the user load 300 for use when the electricity price is peak, or supply the user load 300 for use when the power grid is outage / power outage.

[0056] Among them, the energy storage device 100 can be but is not limited to a single cell (secondary battery), and a battery module, battery pack, battery system, etc. composed of single cells. The battery cell can be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the battery cell can be cylindrical, flat, rectangular, etc., and the embodiment of the present application does not limit this. Specifically, the battery cell can utilize the chemical reaction or change of the energy storage medium (chemical element) to realize the charging and discharging process. Simply put, the electric energy generated by light energy and wind energy is stored in the battery cell through the chemical reaction or change of the energy storage medium. When the use of external electric energy reaches a peak, the electric energy stored in the battery cell is released for use through the chemical reaction or change of the energy storage medium, or transferred for use.

[0057] Next, the energy storage device 100 is explained in detail by taking the energy storage device 100 as a cylindrical single battery as an example.

[0058] In some embodiments, as Figure 2 As shown, the energy storage device 100 includes: a shell 10, an electrode assembly 20 and an end cover assembly 30. The shell 10 has an open accommodating cavity 11, the electrode assembly 20 is accommodated in the accommodating cavity 11, and the end cover assembly 30 seals the opening of the accommodating cavity 11.

[0059] The shell 10 may be a cylindrical structure with one end open. In this case, the energy storage device 100 includes an end cap assembly 30 to seal one opening of the shell 10. Of course, the shell 10 may also be a cylindrical structure with both ends open. In this case, the energy storage device 100 includes an end cap assembly 30 and a cover plate 31, or includes two end cap assemblies 30. In this way, one end cap assembly 30 and one cover plate 31, or two end cap assemblies 30, can respectively seal the two openings of the shell 10.

[0060] Among them, Figure 2As shown, the end cap assembly 30 includes a cover plate 31 and an electrode column 32. The electrode column 32 is passed through the cover plate 31, and one end is connected to the electrode assembly 20, and the other end is exposed on the outside of the cover plate 31 to serve as an output end of the energy storage device 100; an explosion-proof valve and an injection hole can be provided on the cover plate 31. The explosion-proof valve is used to discharge the gas accumulated in the accommodating cavity of the shell 10 to improve the safety of the energy storage device 100. The injection hole is used to inject electrolyte into the accommodating cavity 11 of the energy storage device 100 to achieve infiltration of the electrode assembly 20.

[0061] The electrode assembly 20 includes a stacked positive electrode sheet, a negative electrode sheet, and a separator, with the separator positioned between the positive and negative electrode sheets. Both the positive and negative electrode sheets have tabs at their ends, forming the positive and negative tabs of the energy storage device 100. Taking the example of the positive and negative tabs being positioned at different ends of the electrode assembly 20, one of the positive and negative tabs is connected to an electrode post 32 included in an end cap assembly 30, while the other is connected to the bottom of the housing 10 or an electrode post 32 included in another end cap assembly 30, thereby enabling electrical energy output through the electrode post 32 of the end cap assembly 30 and the bottom of the housing 10, or through the electrode posts 32 of both end cap assemblies 30.

[0062] It should be noted that the energy storage device 100 may further include a metal adapter to achieve connection between the tab and the electrode column 32 through the metal adapter, thereby ensuring the current carrying capacity between the electrode column 32 and the tab.

[0063] In the related art, to ensure the airtightness of the energy storage device 100, a sealing ring is typically installed between the electrode column 32 and the cover plate 31. However, if the sealing ring is missing or fails, the compression of the plastic between the pressing block 321 and the cover plate 31 may cause the energy storage device 100 to fail the airtightness test, thereby reducing the manufacturing yield of the energy storage device 100 and posing a serious safety hazard to the subsequent use of the energy storage device 100.

[0064] An embodiment of the present application provides an end cap assembly 30. Based on the end cap assembly 30, the reliability of the airtightness detection of the energy storage device 100 can be ensured in the event that a sealing ring is missing or fails, thereby improving the manufacturing yield of the energy storage device 100 and reducing the safety hazards of the energy storage device 100 during use.

[0065] like Figure 3 and Figure 4As shown, the end cap assembly 30 includes: a cover plate 31, an electrode column 32, a first insulating member 33 (such as plastic) and a sealing member 34; the cover plate 31 has a through-mounting hole 311; the electrode column 32 includes a pressing block 321 and a columnar body 322, the pressing block 321 is located on one side of the cover plate 31 and has a through-first through-hole 323, the first end 324 of the columnar body 322 passes through the mounting hole 311 and is limited in the first through-hole 323, and the columnar body 322 has a The second end portion 325 is limited to the second side of the cover plate 31, and the hole wall of the first through hole 323 and / or the side wall of the first end portion 324 have an air guide groove 326, and the two ends of the air guide groove 326 are respectively connected to the mounting hole 311 and the external environment of the first side of the cover plate 31; the first insulating member 33 is sleeved on the columnar body 322 and is located between the cover plate 31 and the pressure block 321; the sealing member 34 is sleeved on the columnar body 322 and is located between the columnar body 322 and the cover plate 31.

[0066] In the embodiment of the present application, the mounting hole 311 on the cover plate 31 is connected to the external environment on the first side of the cover plate 31 by means of the air guide groove 326 provided on the hole wall of the first through hole 323 on the pressing block 321 and / or the side wall of the first end portion 324 on the columnar body 322. Therefore, after the end cover assembly 30 seals the opening of the housing 10, the detection gas can still flow out of the energy storage device 100 along the mounting hole 311 and the air guide groove 326 on the cover plate 31, thereby ensuring the reliability of the air tightness detection.

[0067] Among them, Figure 3 or Figure 4 As shown, the first insulating member 33 has a second through hole 332. When the first insulating member 33 is sleeved on the columnar body 322 based on the second through hole 332, an air flow channel is formed between the hole wall of the second through hole 332 and the side wall of the columnar body 322 (for example, there is a gap, or the hole wall of the second through hole 332 is grooved, etc.) to ensure the connection between the air guide groove 326 and the mounting hole 311 on the cover plate 31.

[0068] Further, if Figure 3 or Figure 4 As shown, the first insulating member 33 has a limiting groove 333 on one side facing the pressing block 321 , and the pressing block 321 is located in the limiting groove 333 to limit the pressing block 321 and prevent the pressing block 321 from shifting when the columnar body 322 and the pressing block 321 are riveted.

[0069] When the cover plate 31 included in the end cap assembly 30 seals the opening of the housing 10 , the second end 325 of the columnar body 322 is connected to the tab of the electrode assembly 20 , so that the columnar body 322 can serve as an electrode output end of the energy storage device 100 .

[0070] Optionally, the second end 325 of the columnar body 322 can be provided with a flange to limit the second end 325 of the columnar body 322 on the second side of the cover plate 31 through the flange, and at the same time, the connection with the pole ear is achieved through the flange to increase the fixing area between the columnar body 322 and the pole ear, thereby ensuring the stability of the connection and a sufficiently large flow area.

[0071] In addition, the cover plate 31 of the end cap assembly 30 includes a body plate 312 (such as a plain aluminum sheet), the body plate 312 seals the opening of the housing 10, and the electrode column 32 is provided on the body plate 312. Figure 3 or Figure 4 As shown, the cover plate 31 also includes a second insulator (such as lower plastic), the second insulating member 313 is stacked with the main plate 312, and is located on the side of the main plate 312 away from the pressing block 321, and the second insulating member 313 is clamped between the main plate 312 and the second end 325 of the columnar body 322 to achieve insulation between the main plate 312 and the electrode assembly 20 or the metal adapter through the second insulating member 313.

[0072] In the embodiment of the present application, for the assembly of the electrode column 32 on the cover plate 31, the first end 324 of the columnar body 322 can be passed through the seal 34, the cover plate 31, and the second insulating member 313 in sequence. When the second end 325 on the columnar body 322 is limited to the second side of the cover plate 31 (that is, the second end 325 is in contact with the seal 34), the pressing block 321 is sleeved on the first end 324 of the columnar body 322 based on the first through hole 323, and pressure is applied to the end face of the first end 324 of the columnar body 322 to cause the first end 324 of the columnar body 322 to expand and deform along the radial direction of the columnar body 322, thereby completing the assembly of the end cover assembly 30 by limiting the first end 324 of the columnar body 322 in the first through hole 323.

[0073] Before the columnar body 322 is extruded, the first end 324 of the columnar body 322 may have a full-diameter structure. After the columnar body 322 is extruded, the first end 324 of the columnar body 322 has a variable-diameter structure, and at least the portion of the first through hole 323 that is sleeved on the first end 324 has a variable-diameter structure. This allows the first end 324 of the columnar body 322 to be positioned within the first through hole 323, and the pressing block 321 to be positioned on one side of the cover plate 31. Furthermore, the first end 324 of the columnar body 322 and the hole wall of the first through hole 323 may be described in the following embodiments, and are certainly not limited to the structures described in the following embodiments.

[0074] In some embodiments, the first end 324 of the columnar body 322 is an inverted frustum-shaped structure, the first through hole 323 includes a variable diameter hole section away from the cover plate 31, and the aperture of the variable diameter hole section gradually increases in the direction from the second end 325 of the columnar body 322 to the first end 324.

[0075] The first through hole 323 includes a variable diameter section whose diameter gradually increases in a direction away from the cover plate 31. The abutment formed between the wall of the variable diameter section and the sidewall of the first end 324 of the columnar body 322 allows the first end 324 of the columnar body 322 to be retained within the variable diameter section, ensuring the assembly of the electrode column 32 on the cover plate 31. Alternatively, the first through hole 323 may comprise a variable diameter section in the portion away from the cover plate 31, and a full diameter section in the remaining portion close to the cover plate 31; alternatively, the entire section of the first through hole 323 may comprise a variable diameter section.

[0076] In other embodiments, Figure 5 or Figure 6 As shown, the hole wall of the first through hole 323 has a first step surface 3231 facing away from the cover plate 31, and the side wall of the first end 324 of the columnar body 322 has a second step surface 327 facing the second end 325, and the first step surface 3231 and the second step surface 327 are in contact with each other.

[0077] Among them, the first through hole 323 includes a small aperture section close to the cover plate 31 and a large aperture section away from the cover plate 31, so that the first step surface 3231 formed by the small aperture section and the large aperture section is abutted with the second step surface 327 formed on the first end 324 of the columnar body 322, so that at least part of the first end 324 of the columnar body 322 is limited within the large aperture section, thereby ensuring the assembly of the electrode column 32 on the cover plate 31.

[0078] In the embodiment of the present application, for the air guide groove 326 provided on the hole wall of the first through hole 323 and / or the side wall of the first end 324 on the columnar body 322, the hole wall of the first through hole 323 may have the air guide groove 326, so as to form an air guide channel through the air guide groove 326 on the hole wall and the side wall of the first end 324; or the side wall of the first end 324 may have the air guide groove 326, so as to form an air guide channel through the air guide groove 326 on the first end 324 and the hole wall of the first through hole 323; or the hole wall of the first through hole 323 and the side wall of the first end 324 may both have the air guide groove 326, so as to form an air guide channel through the air guide groove 326 on the hole wall and the air guide groove 326 on the first end 324.

[0079] Among them, in the case where the side wall of the first end 324 of the columnar body 322 has an air guide groove 326, the air guide groove 326 extends along the axial direction of the columnar body 322 to the end face edge of the first end 324 on the columnar body 322 to ensure that the air guide channel formed by the air guide groove 326 and the hole wall of the first through hole 323 is connected to the external environment of the first side of the cover plate 31.

[0080] It should be noted that since the first end 324 of the columnar body 322 needs to be extruded to achieve riveting between the columnar body 322 and the pressure block 321, the air guide groove 3222 set on the side of the first end 324 of the columnar body 322 needs to have a certain depth to ensure the reliability of the air guide groove 326 after the columnar body 322 is extruded.

[0081] In some embodiments, the first end portion 324 of the columnar body 322 described above has an inverted truncated cone structure, and the hole wall of the first through hole 323 has an air guide groove 326, and the two ends of the air guide groove 326 extend to the edge of the hole of the first through hole 323 close to the cover plate 31 and the edge of the hole away from the cover plate 31, respectively, and the air guide groove 326 and the side wall of the first end portion 324 form an air guide channel.

[0082] Among them, one end of the air guide groove 326 extends to the edge of the hole of the first through hole 323 close to the cover plate 31 to connect with the mounting hole 311 on the cover plate 31, and the other end of the air guide groove 326 extends to the edge of the hole of the first through hole 323 away from the cover plate 31 to connect with the external environment on the first side of the cover plate 31, thereby realizing the connection between the mounting hole 311 on the cover plate 31 and the external environment on the side of the cover plate 31 close to the pressure block 321, thereby ensuring the reliability of the air tightness detection.

[0083] Among them, the air guide groove 326 can be a straight groove or a curved groove, etc. The hole wall of the first through hole 323 can be provided with multiple air guide grooves 326, and the multiple air guide grooves 326 are evenly distributed along the circumference of the first through hole 323 to ensure that at least part of the multiple air guide grooves 326 connects the mounting hole 311 on the cover plate 31 and the external environment on the side of the cover plate 31 close to the pressure block 321.

[0084] It should be noted that in the case where the ends of the air guide groove 326 extend to the opening edges of the first through hole 323, the first through hole 323 may include a variable diameter hole section and a full diameter hole section, or the entire hole section of the first through hole 323 may be a variable diameter hole section. When the first through hole 323 includes a full diameter hole section close to the cover plate 31 and a variable diameter hole section away from the cover plate 31, a gap remains between the hole wall of the full diameter hole section and the side wall of the columnar body 322 before the columnar body 322 is squeezed. Therefore, in addition to providing air guide grooves 326 with their ends extending to the corresponding opening edges of the first through hole 323, air guide grooves 326 may also be provided only on the hole wall of the variable diameter hole section. In this case, the gap between the hole wall of the full diameter hole section and the side wall of the columnar body 322 can be used to achieve communication between the air guide groove 326 and the mounting hole 311 on the cover plate 31.

[0085] In some embodiments, the hole wall of the first through hole 323 described above has a first step surface 3231 facing away from the cover plate 31, the first through hole 323 includes a small aperture section located on the side of the first step surface 3231 close to the cover plate 31 and a large aperture section located on the side of the first step surface 3231 away from the cover plate 31, and the hole wall of the first through hole 323 includes the first step surface 3231, the small diameter hole wall 3232 of the small aperture section, and the large diameter hole wall 3233 of the large aperture section.

[0086] Since the pressing block 321 and the columnar body 322 are both metal parts, after the first end 324 of the columnar body 322 is riveted to the pressing block 321 and is confined within the first through hole 323, there may still be a gap between the hole wall of the first through hole 323 (the small-diameter hole wall 3232, the large-diameter hole wall 3233, and the first step surface 3231) and the side wall of the first end 324. In this way, based on the gap between the hole wall of the first through hole 323 and the side wall of the first end 324, a first air guide groove 3234 can be provided in the small-diameter hole wall 3232 and / or the large-diameter hole wall 3233, as shown in FIG. Figure 5 or Figure 6 As shown, an air guide channel is formed by the first air guide groove 3234 and the side wall of the first end portion 324, thereby ensuring the connection between the mounting hole 311 on the cover plate 31 and the external environment on the first side of the cover plate 31, effectively ensuring the reliability of the air tightness detection.

[0087] The small diameter hole wall 3232 and / or the large diameter hole wall 3233 are provided with a plurality of first air guiding grooves 3234, and the plurality of first air guiding grooves 3234 are spaced apart along the circumference of the first through hole 323. For example, the small diameter hole wall 3232 of the small diameter section is provided with a plurality of spaced apart first air guiding grooves 3234.

[0088] Alternatively, as Figure 5As shown, the small diameter hole wall 3232 has a first air guide groove 3234 , and the large diameter hole wall 3233 and the side wall of the first end portion 324 form a first gap 3235 , and both ends of the first air guide groove 3234 are connected to the mounting hole 311 and the first gap 3235 respectively.

[0089] Among them, one end of the first air guide groove 3234 extends to the edge of the opening of the first through hole 323, and the other end extends to the inner edge of the first step surface 3231, so as to realize the connection between the mounting hole 311, the first air guide groove 3234, and the first gap 3235, that is, to realize the connection between the mounting hole 311 and the external environment of the first side of the cover plate 31. Therefore, after the end cover assembly 30 seals the opening of the shell 10, the detection gas can still flow out of the energy storage device 100 along the mounting hole 311, the first air guide groove 3234, and the first gap 3235 on the cover plate 31, thereby ensuring the reliability of the air tightness detection.

[0090] Alternatively, as Figure 6 As shown, the first step surface 3231 has a second air guide groove 3236, the small diameter hole wall 3232 and the large diameter hole wall 3233 both have a first air guide groove 3234, and the second air guide groove 3236 is connected to the first air guide groove 3234 on the small diameter hole wall 3232 and the large diameter hole wall 3233 respectively.

[0091] In this way, through the second air guide groove 3236 set on the first step surface 3231, and the first air guide groove 3234 set on the small-diameter hole wall 3232 and the large-diameter hole wall 3233, the reliability of the connection between the mounting hole 311 on the cover plate 31 and the external environment on the side of the cover plate 31 close to the pressure block 321 is ensured, thereby ensuring the reliability of the air tightness detection.

[0092] In some embodiments, as Figure 5 or Figure 6 As shown, the surface of the first insulating member 33 facing away from the pressing block 321 has a protruding ring 331 . The protruding ring 331 is disposed around the periphery of the columnar body 322 and is located between the hole wall of the mounting hole 311 and the side wall of the columnar body 322 .

[0093] In this way, by setting the protruding ring 331 on the first insulating member 33, the hole wall of the mounting hole 311 on the cover plate 31 and the side wall of the columnar body 322 are isolated, thereby effectively avoiding the electrical conduction and short circuit between the cover plate 31 and the columnar body 322.

[0094] There is a gap between the inner wall of the protruding ring 331 and the side wall of the columnar body 322 to ensure the communication between the air guide groove 326 and the mounting hole 311 , thereby ensuring the reliability of the air tightness detection of the energy storage device 100 .

[0095] In some embodiments, as Figure 7 and Figure 8As shown, the seal 34 includes a cylindrical body 341 and a first sealing portion 342 connected to one axial end of the cylindrical body 341; the cylindrical body 341 is sleeved on the columnar body 322, and the first sealing portion 342 is clamped between the columnar body 322 and the second side surface of the cover plate 31.

[0096] In this way, the first sealing portion 342 sandwiched between the second end portion 325 of the columnar body 322 and the second side surface of the cover plate 31 can achieve a sealed assembly between the columnar body 322 and the cover plate 31 , thereby ensuring the sealing performance of the end cover assembly 30 .

[0097] Optionally, in combination with the above-mentioned situation where the first insulating member 33 has a convex ring 331, the convex ring 331 can be abutted against the cylindrical body 341, so that the hole wall of the mounting hole 311 and the columnar body 322 can be completely isolated, thereby effectively avoiding the electrical conduction and short circuit between the cover plate 31 and the columnar body 322.

[0098] Alternatively, as Figure 8 As shown, the seal 34 also includes a second sealing portion 343, which is connected to one end of the cylindrical body 341 axially away from the first sealing portion 342 and is clamped between the pressure block 321 and the first side surface of the cover plate 31. A second gap 344 is formed between the inner wall of the cylindrical body 341 and the side wall of the columnar body 322, and the second gap 344 is connected to the air guide groove 326.

[0099] In this way, by setting the second sealing part, it is convenient to achieve sealing between the pressure block 321 and the cover plate 31, thereby ensuring the reliability of the sealing of the electrode column 32 on the cover plate 31; at the same time, the cylindrical body 341 included in the seal 34 can completely achieve isolation between the hole wall of the mounting hole 311 and the columnar body 322, thereby effectively avoiding the electrical conduction and short circuit between the cover plate 31 and the columnar body 322; furthermore, the second gap 344 formed between the inner wall of the cylindrical body 341 and the side wall of the columnar body 322 can be used to achieve communication with the external environment on the first side of the cover plate 31, thereby ensuring the reliability of airtightness detection.

[0100] The embodiment of the present application also provides an electric device 400, which can be a user energy storage cabinet, an energy storage container, etc. Figure 9 As shown, the electrical device 400 includes the energy storage device 100 described in the above embodiment, and the energy storage device 100 supplies power to the electrical device 400. Thus, in combination with the above, the electrical device 400 of the present application can ensure the stability of the electrical device 400 during use based on the production yield and use safety of the energy storage device 100.

[0101] In the embodiments of the present application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0102] In the description of the embodiments of the present application, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present application.

[0103] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the implementation methods of this application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0104] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An end cap assembly, characterized in that: include: A cover plate (31) having a penetrating mounting hole (311); An electrode column (32) comprises a pressing block (321) and a columnar body (322), wherein the pressing block (321) is located on a first side of the cover plate (31) and has a first through hole (323) extending therethrough, a first end portion (324) of the columnar body (322) passes through the mounting hole (311) and is confined within the first through hole (323), a second end portion (325) of the columnar body (322) is confined on a second side of the cover plate (31), a hole wall of the first through hole (323) and / or a side wall of the first end portion (324) having an air guide groove (326), and two ends of the air guide groove (326) are respectively connected to the mounting hole (311) and the external environment of the first side of the cover plate (31); a first insulating member (33), the first insulating member (33) being sleeved on the columnar body (322) and located between the cover plate (31) and the pressing block (321); The sealing member (34) is sleeved on the columnar body (322) and is located between the columnar body (322) and the cover plate (31).

2. The end cap assembly according to claim 1, wherein: The hole wall of the first through hole (323) has a first step surface (3231) facing away from the cover plate (31), and the side wall of the first end portion (324) has a second step surface (327) facing the second end portion (325), and the first step surface (3231) and the second step surface (327) are in abutment with each other.

3. The end cap assembly according to claim 2, wherein: The first through hole (323) comprises a small aperture section located on a side of the first step surface (3231) close to the cover plate (31) and a large aperture section located on a side of the first step surface (3231) away from the cover plate (31); The small-diameter hole wall (3232) of the small-diameter section and / or the large-diameter hole wall (3233) of the large-diameter section have a first air guide groove (3234), and the first air guide groove (3234) and the side wall of the first end portion (324) form an air guide channel.

4. The end cap assembly according to claim 3, wherein: The small-diameter hole wall (3232) has the first air guide groove (3234), the large-diameter hole wall (3233) and the side wall of the first end portion (324) form a first gap (3235), and the two ends of the first air guide groove (3234) are respectively connected to the mounting hole (311) and the first gap (3235).

5. The end cap assembly according to claim 3, wherein: The first step surface (3231) has a second air guide groove (3236); The small-diameter hole wall (3232) and the large-diameter hole wall (3233) both have the first air guide groove (3234), and the second air guide groove (3236) is connected to the first air guide groove (3234) on the small-diameter hole wall (3232) and the large-diameter hole wall (3233), respectively.

6. The end cap assembly according to any one of claims 1 to 5, wherein: The surface of the first insulating member (33) facing away from the pressing block (321) has a convex ring (331), and the convex ring (331) is arranged around the periphery of the columnar body (322) and is located between the hole wall of the mounting hole (311) and the side wall of the columnar body (322).

7. The end cap assembly according to claim 6, wherein: The sealing member (34) includes a cylindrical body (341) and a first sealing portion (342) connected to one axial end of the cylindrical body (341); The cylindrical body (341) is sleeved on the columnar body (322), the first sealing portion (342) is clamped between the columnar body (322) and the second side surface of the cover plate (31), and the convex ring (331) is in contact with the cylindrical body (341).

8. The end cap assembly according to any one of claims 1 to 5, wherein: The sealing member (34) includes a cylindrical body (341), and a first sealing portion (342) and a second sealing portion (343) connected to both ends of the cylindrical body (341) along the axial direction. The cylindrical body (341) is sleeved on the columnar body (322), and a second gap (344) is formed between the inner wall of the cylindrical body (341) and the side wall of the columnar body (322), and the second gap (344) is communicated with the air guide groove (326). The first sealing portion (342) is clamped between the columnar body (322) and the second side surface of the cover plate (31), and the second sealing portion (343) is clamped between the pressure block (321) and the first side surface of the cover plate (31).

9. An energy storage device, characterized in that: include: A housing (10) comprising a receiving cavity (11) having an opening; An electrode assembly (20) is accommodated in the accommodating cavity (11); The end cover assembly (30) according to any one of claims 1 to 8, wherein the end cover assembly (30) seals the opening of the accommodating cavity (11).

10. An electrical device, characterized in that: The electrical device (400) includes the energy storage device (100) according to claim 9, and the energy storage device (100) supplies power to the electrical device (400).

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