Energy storage devices and electrical equipment

Abstract

The present application discloses an energy storage device and electrical equipment, which relate to the field of energy storage technology. The energy storage device includes: a shell, which forms a receiving cavity with an opening; an electrode assembly, which is received in the receiving cavity; an end cover assembly, which includes a cover plate, an electrode terminal and a sealant, wherein the cover plate seals the opening of the receiving cavity and has a welding hole connected to the receiving cavity, the electrode terminal is provided on the cover plate, and the end of the electrode terminal facing the electrode assembly has a connecting portion, the connecting portion has a welding portion exposed at the welding hole, the welding portion is electrically connected to the electrode assembly, and the sealant is sealed and limited in the welding hole. In the embodiment of the present application, after the cover plate seals the opening of the shell, the electrical connection between the connecting portion and the electrode assembly can be completed at the welding hole, and then the sealing member is used to seal the welding hole to complete the assembly of the energy storage device, thereby improving the assembly efficiency and ensuring the service life of the energy storage device.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage device and 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 secondary batteries grows, so too are the demands placed on their performance, particularly their lifespan.

[0003] In related technologies, secondary batteries typically consist of a housing, an electrode assembly, and an end cap assembly. The actual production process involves separately fabricating the housing, electrode assembly, and end cap assembly. The electrode terminals and the first tabs of the electrode assembly, including the end cap assembly, are then electrically connected and welded together. The electrode assembly is then placed within the housing, electrically connected to the bottom of the housing, and the housing opening is sealed with the end cap assembly, completing the basic structure of the secondary battery.

[0004] The end cap assembly includes a cover plate, onto which the electrode terminals are inserted. During secondary battery assembly, a bendable adapter is first used to electrically connect the electrode terminals and the electrode assembly. After the electrode assembly is inserted into the battery case, the adapter is bent to seal the cover plate against the battery case opening. This bending of the adapter not only increases the complexity of secondary battery assembly but also causes tension on the adapter after the cover plate seals the battery case, shortening the battery's lifespan. Summary of the Invention

[0005] A main purpose of the present application is to provide an energy storage device and electrical equipment that improves assembly efficiency and ensures service life.

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

[0007] According to one aspect of the present application, there is provided an energy storage device, comprising: a shell, which forms a accommodating cavity with an opening; an electrode assembly, which is accommodated in the accommodating cavity; an end cap assembly, which comprises a cover plate, an electrode terminal and a seal, wherein the cover plate seals the opening of the accommodating cavity and has a welding hole connected to the accommodating cavity, the electrode terminal is arranged on the cover plate, and the end of the electrode terminal facing the electrode assembly has a connecting portion, the connecting portion has a welding portion exposed at the welding hole, the welding portion is electrically connected to the electrode assembly, and the seal seals and is confined in the welding hole.

[0008] In the embodiment of the present application, after the cover plate seals the opening of the shell, the electrical connection between the connecting portion and the electrode assembly is completed at the welding hole, and then the welding hole is sealed with a seal to complete the assembly of the energy storage device, thereby improving the assembly efficiency and ensuring the service life of the energy storage device.

[0009] According to one embodiment of the present application, the energy storage device further includes a adapter, which is a flat plate structure; the adapter is located between the electrode assembly and the electrode terminal, and the adapter is electrically connected to the electrode assembly and to the welding portion.

[0010] In the embodiment of the present application, the flow capacity between the electrode assembly and the connecting portion is ensured by the provision of the adapter, and at the same time, based on the surface of the adapter, the stability of the electrical connection between the connecting portion and the adapter is ensured, thereby ensuring the stability of the electrical connection between the connecting portion and the electrode assembly; in addition, the adapter based on the flat-plate structure avoids bending the adapter when assembling the energy storage device, thereby reducing the complexity of assembly and improving assembly efficiency.

[0011] According to one embodiment of the present application, the sealing member includes an explosion-proof valve, the adapter has a first air vent, the connecting portion has a second air vent, and the accommodating cavity, the first air vent, the second air vent and the welding hole are connected in sequence.

[0012] In the embodiment of the present application, at least part of the edge of the connecting portion is arranged to be located within the area surrounded by the welding hole, so as to realize partial obstruction of the welding hole by the connecting portion, so as to facilitate the alignment connection between the connecting portion and the adapter. At the same time, based on the channel of the welding hole that is not obstructed by the connecting portion, combined with the first air vent on the adapter, communication with the accommodating cavity is achieved to ensure the reliability of the opening of the seal.

[0013] According to one embodiment of the present application, the sealing member includes an explosion-proof valve, the adapter has a first air vent, at least part of the edge of the positive projection of the connecting portion on the cover plate is located within the area surrounded by the welding hole, and the accommodating cavity, the first air vent and the welding hole are connected in sequence.

[0014] According to one embodiment of the present application, the adapter is disc-shaped and has a plurality of protrusions facing the cover plate and distributed at intervals along its own circumference, and one of the plurality of protrusions is connected to the connecting portion at the welding hole.

[0015] In the embodiment of the present application, by setting the protrusions and based on the electrical connection between the protrusions and the connecting part, the flatness of the adapter relative to the connecting part is ensured, thereby ensuring the reliability of the electrical connection between the adapter and the connecting part; in addition, based on the connection between any one of the multiple protrusions and the connecting part, the alignment efficiency of the connecting part and the adapter is improved, thereby improving the connection efficiency between the connecting part and the adapter.

[0016] According to one embodiment of the present application, the protrusion is an arc-shaped structure extending along the circumference of the adapter, the welding hole is an oblong hole, and the length direction of the welding hole is perpendicular to the radial direction of the adapter.

[0017] According to one embodiment of the present application, the cover plate has at least one bulge facing the electrode assembly, one of the plurality of bulges is electrically connected to the connecting portion, and each of the remaining bulges abuts against one of the bulges.

[0018] In the embodiment of the present application, by abutting each of the remaining protrusions against a convex bump, the positional stability between the adapter and the cover plate is ensured, thereby ensuring the abutment effect between the connecting portion and the adapter, that is, ensuring the reliability of the electrical connection between the connecting portion and the adapter.

[0019] According to one embodiment of the present application, the sealing member includes an explosion-proof valve; at least part of the edge of the positive projection of the connecting portion on the cover plate is located within the area surrounded by the welding hole, and the accommodating cavity and the welding hole are connected; and / or the connecting portion has a second air vent, and the second air vent connects the accommodating cavity and the welding hole.

[0020] In an embodiment of the present application, at least part of the edge of the connecting portion is located within the area surrounded by the welding hole, so as to achieve partial shielding of the welding hole by the connecting portion, so as to facilitate the alignment connection between the connecting portion and the electrode assembly, while ensuring the connectivity between the welding hole and the accommodating cavity, so as to ensure the reliability of the opening of the seal.

[0021] According to one embodiment of the present application, the cover plate has a limiting groove facing the electrode assembly, and the connecting part is limited in the limiting groove; or, the cover plate has a pair of limiting bars facing the electrode assembly, the limiting bars extend along the length direction of the connecting part, and the connecting part is limited between the pair of limiting bars.

[0022] In the embodiment of the present application, when the electrode terminal is inserted into the cover plate, the connection portion can be limited relative to the cover plate based on the setting of the limiting groove or the limiting strip, thereby ensuring that at least part of the connection portion is exposed at the welding hole, thereby improving the assembly efficiency of the electrode terminal and the cover plate.

[0023] According to an embodiment of the present application, the cover plate has a limiting column facing the electrode assembly, the connecting portion has a limiting hole, and the limiting column is located in the limiting hole.

[0024] According to an embodiment of the present application, the hole wall of the welding hole has a step surface facing away from the electrode assembly, and the sealing member is supported on the step surface.

[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 top view of the structure of an energy storage device according to an exemplary embodiment.

[0030] Figure 3 yes Figure 2 The cross-sectional structural diagram of the energy storage device along AA' is shown.

[0031] Figure 4 The figure is a schematic diagram of an axial side explosion structure of an end cover assembly according to an exemplary embodiment.

[0032] Figure 5 yes Figure 3 The enlarged structural diagram of the energy storage device in area B1 is shown.

[0033] Figure 6 It is a bottom view structural schematic diagram of an end cover assembly according to an exemplary embodiment.

[0034] Figure 7 It is a bottom view structural schematic diagram of another end cover assembly according to an exemplary embodiment.

[0035] Figure 8 It is a bottom view structural schematic diagram of another end cover assembly according to an exemplary embodiment.

[0036] Figure 9 It is a schematic top view of the structure of an end cover assembly according to an exemplary embodiment.

[0037] Figure 10 yes Figure 9 The bottom view of the end cover assembly is shown.

[0038] Figure 11 FIG1 is a schematic top view of another end cover assembly according to an exemplary embodiment.

[0039] Figure 12 yes Figure 10 The bottom view of the end cover assembly is shown.

[0040] Figure 13 The figure is a schematic diagram of an axial explosion structure of an end cover assembly and an adapter according to an exemplary embodiment.

[0041] Figure 14 An end cap assembly and an adapter are shown according to an exemplary embodiment. Figure 2 The cross-sectional structural diagram of AA' is shown.

[0042] Figure 15 yes Figure 14 The cross-sectional structural schematic diagram shown is an enlarged structural schematic diagram of the B2 area.

[0043] Figure 16 It is a schematic structural diagram of an electric device according to an exemplary embodiment.

[0044] The description of the accompanying drawings is as follows:

[0045] 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment;

[0046] 10. Shell; 20. Electrode assembly; 30. End cap assembly; 40. Adapter;

[0047] 11. Accommodating cavity;

[0048] 31. Cover plate; 32. Electrode terminal; 33. Sealing member; 34. Sealing ring;

[0049] 311, welding hole; 312, convex bump; 313, limiting groove; 314, limiting strip; 315, limiting column; 316, main body plate; 317, first insulating member;

[0050] 3111, step surface;

[0051] 321, connecting portion; 322, electrode column; 323, second insulating member; 324, riveted pressing block;

[0052] 3211, second vent hole; 3212, limiting hole; 3213, welding part;

[0053] 41. First vent hole; 42. Protrusion; 43. Groove. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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 unstable voltage of the green power grid (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 curtailment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0057] 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.

[0058] 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:

[0059] (1) Large energy storage containers used on the grid side can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electric energy in time and space, enhancing the capacity to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0060] (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, they release the electricity in the energy storage device for use, so as to achieve the purpose of saving electricity bills. In addition, in remote areas, as well as 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.

[0061] 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.

[0062] Taking the user-side home energy storage scenario as an example, Figure 1 A 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, 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. Specifically, the electric energy conversion device 200 can convert solar energy into electrical energy and store it through the energy storage device 100. The energy can then be supplied to the user load 300 for use during peak electricity prices or during power outages.

[0063] Among them, the energy storage device 100 can be, but is not limited to, a single cell (secondary battery), as well as 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 embodiments of the present application are not limited to 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 electrical 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 electricity reaches a peak, the electrical 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.

[0064] In some embodiments, as Figure 2 and Figure 3As shown, the energy storage device 100 includes: a shell 10, an electrode assembly 20 and an end cap assembly 30. The shell 10 encloses a receiving cavity 11 with an opening. The electrode assembly 20 is accommodated in the receiving cavity 11. The end cap assembly 30 seals the opening of the receiving cavity 11.

[0065] The shell 10 may be a cylindrical structure with one end open, in which 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 which case the energy storage device 100 includes an end cap assembly 30 and an end plate, or includes two end cap assemblies 30, so as to respectively seal the two openings of the shell 10 through an end cap assembly 30 and an end plate, or two end cap assemblies 30.

[0066] Among them, such as Figure 4 As shown, the end cap assembly 30 includes a cover plate 31 and an electrode terminal 32. The electrode terminal 32 is provided on the cover plate 31, and one end is exposed in the accommodating cavity 11, and the other end is exposed outside the accommodating cavity 11. The electrode terminal 32 and the cover plate 31 can be electrically insulated. For example, Figure 4 As shown, the cover plate 31 includes a main body plate 316 (such as a bare aluminum sheet) and a first insulating member 317 (such as a lower plastic), and the electrode terminal 32 includes an electrode column 322 and a second insulating member 323 (such as an upper plastic). The main body plate 316 is located between the first insulating member 317 and the second insulating member 323. The electrode column 322 passes through the first insulating member 317, the main body plate 316, and the second insulating member 323 in sequence, and the two ends of the electrode column 322 are respectively limited to the side of the first insulating member 317 and the second insulating member 323 away from the main body plate 316; further, the electrode terminal 32 may also include a riveted pressing block 324, and the end of the electrode column 322 passes through the riveted pressing block 324 and is limited to the side of the second insulating member 323 away from the main body plate 316 by riveting. In addition, as Figure 4 As shown, the end cap assembly 30 also includes a sealing ring 34, which is mounted on the electrode terminal 32 (electrode column 322) to achieve a seal between the electrode terminal 32 and the cover plate 31. Furthermore, the cover plate 31 can be provided with an explosion-proof valve, which explodes when the pressure in the accommodating chamber 11 exceeds the valve opening pressure of the explosion-proof valve, thereby expelling the gas in the accommodating chamber 11 and improving the safety of the energy storage device 100. The cover plate 31 can also be provided with an injection hole to inject electrolyte into the accommodating chamber 11 through the injection hole to achieve infiltration of the electrode assembly 20.

[0067] The electrode assembly 20 includes a stacked first electrode sheet, a second electrode sheet, and a diaphragm. The first electrode sheet and the second electrode sheet have opposite polarities, and the diaphragm is located between the first and second electrode sheets. The ends of the electrode assembly 20 have first and second electrode tabs with opposite polarities. The first and second electrode tabs can be located at the same end of the electrode assembly 20 or at different ends. For example, in a case where the first and second electrode tabs are located at both ends of the electrode assembly 20 and the housing 10 is a cylindrical structure with one end open, one of the first and second electrode tabs is connected to the electrode terminal 32 (electrode column 322) included in the end cap assembly 30, and the other is connected to the bottom of the housing 10, so that electrical energy can be output through the electrode terminal 32 of the end cap assembly 30 and the bottom of the housing 10.

[0068] It should be noted that the energy storage device 100 may also include an adapter 40 (such as a collecting plate, etc.) to connect the first electrode tab and the second electrode tab of the electrode assembly 20 to the electrode terminal 32 and the bottom of the shell 10 respectively through two adapters 40, thereby ensuring the flow capacity between the electrode terminal 32 and the electrode assembly 20, and between the bottom of the shell 10 and the electrode assembly 20.

[0069] In the related art, when using an adapter 40 to connect the electrode assembly 20 and the electrode terminal 32, the adapter 40 is designed to be bendable to facilitate sealing of the cover plate 31 of the end cap assembly 30 against the opening of the housing 10. This not only increases the assembly complexity of the energy storage device 100, but also, due to the bending effect of the adapter 40, causes the adapter 40 to be subjected to tensile forces after the cover plate 31 seals the housing 10, shortening the service life of the energy storage device 100.

[0070] The embodiment of the present application provides an energy storage device 100, and the energy storage device 100 includes an end cap assembly 30, such as Figure 4 and Figure 5 As shown, the end cover assembly 30 includes, in addition to the cover plate 31 and the electrode terminal 32, a seal 33. The cover plate 31 has a welding hole 311 connected to the accommodating cavity 11. The electrode terminal 32 has a connecting portion 321 at the end facing the electrode assembly 20. The connecting portion 321 has a welding portion 3213 exposed at the welding hole 311. The welding portion 3213 is electrically connected to the electrode assembly 20. The seal 33 is sealed and confined within the welding hole 311.

[0071] In this way, for the connecting portion 321 provided on the end of the electrode terminal 32 facing the electrode assembly 20, and the welding hole 311 provided on the cover plate 31, after the cover plate 31 seals the opening of the shell 10, the electrical connection between the connecting portion 321 and the electrode assembly 20 can be completed at the welding hole 311, and then the sealing member 33 is used to seal the welding hole 311 to complete the assembly of the energy storage device 100, thereby improving the assembly efficiency and ensuring the service life of the energy storage device 100.

[0072] Among them, the seal 33 included in the end cap assembly 30 can be a sealing patch. Of course, the seal 33 can also be a sealing nail, and the corresponding welding hole 311 can be reused as an injection hole; or the seal 33 at least includes an explosion-proof valve, and the corresponding welding hole 311 can be reused as an explosion-proof hole, etc. When the seal 33 is an injection hole, or at least includes an explosion-proof valve, the connection part 321 does not completely block the welding hole 311, so as to ensure the communication between the welding hole 311 and the accommodating chamber 11, thereby ensuring the effective injection of electrolyte, or when the pressure in the accommodating chamber 11 is greater than the opening pressure of the explosion-proof valve, the explosion-proof valve is caused to explode and the gas in the accommodating chamber 11 is discharged. In addition, combined with the above-mentioned electrode terminal 32 structure, the connection part 321 is connected to the end of the electrode column 322 facing the electrode assembly 20, and the connection part 321 and the electrode column 322 can be an integrated structure or fixed by welding.

[0073] It should be noted that, for the case where the connection portion 321 does not completely cover the welding hole 311, please refer to the following description for details. In addition, the electrical connection described above and the electrical connection involved below in this application can be one of welding, conductive agent bonding, etc.

[0074] In some embodiments, as Figure 4 or Figure 5 As shown, the wall of the welding hole 311 has a step surface 3111 facing away from the electrode assembly 20 , and the sealing member 33 is supported on the step surface 3111 (ie, the tread on the wall of the welding hole 311 ).

[0075] In this way, the seal 33 can be supported by the step surface 3111 so that the seal 33 has a certain support height, thereby avoiding the weld mark after the connection part 321 is welded to the electrode assembly 20 interfering with the assembly of the seal 33; in addition, based on the setting of the step surface 3111, it is convenient to realize the positioning of the seal 33 in the welding hole 311, and then based on the edge welding of the edge of the seal 33 and the hole wall of the welding hole 311 (that is, the kick surface on the hole wall of the welding hole 311), the sealing limitation of the seal 33 in the welding hole 311 can be realized.

[0076] Among them, the step surface 3111 of the welding hole 311 is an annular structure, and the circumferential edges of the seal 33 are all supported on the step surface 3111 of the welding hole 311 to ensure the support area of the seal 33 in the welding hole 311 and ensure the reliability of the limiting seal of the seal 33 in the welding hole 311.

[0077] In some embodiments, as Figure 6As shown, the cover plate 31 has a retaining groove 313 facing the electrode assembly 20, and the connecting portion 321 is retained within the retaining groove 313. Thus, when the electrode terminal 32 is inserted through the cover plate 31, the connecting portion 321 can be retained relative to the cover plate 31, thereby ensuring that at least a portion of the connecting portion 321 is exposed at the welding hole 311, thereby improving the assembly efficiency of the electrode terminal 32 and the cover plate 31.

[0078] The depth of the limiting groove 313 is less than the thickness of the connecting portion 321, so as to limit the connecting portion 321 while not interfering with the electrical connection between the connecting portion 321 and the electrode assembly 20. Furthermore, in combination with the aforementioned structure of the cover plate 31, the surface of the first insulating member 317 facing the electrode assembly 20 may have the limiting groove 313, and the depth of the limiting groove 313 may be less than the thickness of the first insulating member 317, so as to ensure electrical insulation between the connecting portion 321 and the main plate 316.

[0079] Of course, in addition to setting the limiting groove 313 on the cover plate 31 to limit the connection part 321, it can also be as follows Figure 7 As shown, the cover plate 31 has a pair of limiting bars 314 facing the electrode assembly 20 . The limiting bars 314 extend along the length direction of the connecting portion 321 , and the connecting portion 321 is limited between the pair of limiting bars 314 .

[0080] The height of the protrusion 42 of the limiting strip 314 is less than the thickness of the connecting portion 321 to prevent the limiting strip 314 from interfering with the electrical connection between the connecting portion 321 and the electrode assembly 20. Furthermore, in combination with the aforementioned structure of the cover plate 31, a pair of limiting strips 314 may be provided on the surface of the first insulating member 317 facing the electrode assembly 20.

[0081] In other embodiments, Figure 8 As shown, the cover plate 31 has a limiting post 315 facing the electrode assembly 20, and the connection portion 321 has a limiting hole 3212, with the limiting post 315 located within the limiting hole 3212. Thus, when the electrode terminal 32 is inserted through the cover plate 31, the limiting post 315 can cooperate with the limiting hole 3212 to limit the connection portion 321 relative to the cover plate 31, thereby ensuring that at least a portion of the connection portion 321 is exposed at the welding hole 311, thereby improving the assembly efficiency of the electrode terminal 32 and the cover plate 31.

[0082] The height of the limiting post 315 is less than or equal to the thickness of the connecting portion 321, so as to limit the connecting portion 321 while not interfering with the electrical connection between the connecting portion 321 and the electrode assembly 20. Furthermore, in combination with the aforementioned structure of the cover plate 31, the limiting post 315 may be provided on the surface of the first insulating member 317 facing the electrode assembly 20.

[0083] In the embodiment of the present application, the connection portion 321 may be directly connected to the electrode assembly 20 or indirectly connected to the electrode assembly 20 via the adapter 40. The two situations are explained below.

[0084] In some embodiments, the connection portion 321 is directly electrically connected to the electrode assembly 20 .

[0085] Among them, the connecting part 321 can completely cover the welding hole 311, so as to increase the contact area between the connecting part 321 and the electrode assembly 20, thereby ensuring the stability of the electrical connection between the connecting part 321 and the electrode assembly 20; of course, the connecting part 321 can also partially cover the welding hole 311. At this time, the electrical connection with the electrode assembly 20 can be achieved based on the part of the connecting part 321 that covers the welding hole 311, and at the same time, based on the area of the welding hole 311 that is not blocked by the connecting part 321, the welding hole 311 and the accommodating cavity 11 are connected, thereby realizing the injection of electrolyte along the welding hole 311, or the gas in the accommodating cavity 11 flows to the welding hole 311.

[0086] In some embodiments, the seal 33 comprises an explosion-proof valve, such as Figure 9 and Figure 10 As shown, at least part of the edge of the orthographic projection of the connecting portion 321 on the cover plate 31 is located within the area surrounded by the welding hole 311, and the accommodating cavity 11 is connected to the welding hole 311;

[0087] In this way, at least part of the edge of the connecting portion 321 is located within the area surrounded by the welding hole 311, so that the connecting portion 321 partially blocks the welding hole 311, so as to facilitate the alignment connection between the connecting portion 321 and the electrode assembly 20, and at the same time ensure the communication between the welding hole 311 and the accommodating cavity 11, so as to ensure the reliability of the opening of the sealing member 33 (explosion-proof valve).

[0088] In which, the connecting portion 321 can be a long strip with a certain width. At this time, in the width direction of the connecting portion 321, the width of the connecting portion 321 is smaller than the size of the welding hole 311, or the width of the connecting portion 321 is equal to the size of the welding hole 311, and the long edge of the connecting portion 321 has a notch to ensure that the connecting portion 321 partially blocks the welding hole 311.

[0089] For example, Figure 9 and Figure 10 As shown, the welding hole 311 is an oblong hole, the width direction of the connecting portion 321 is parallel to the length direction of the welding hole 311, and the width of the connecting portion 321 is smaller than the length of the welding hole 311. At this time, the midpoint of the connecting portion 321 in the width direction can be set to coincide with the center point of the welding hole 311, so that the two ends of the welding hole 311 in the length direction are not blocked by the connecting portion 321.

[0090] It should be noted that, in addition to the above-mentioned situation, the connection portion 321 partially blocks the welding hole 311. Figure 11 and Figure 12 As shown, the connecting portion 321 has a second air vent 3211, which connects the accommodating cavity 11 and the welding hole 311, so as to achieve partial shielding of the welding hole 311 by the connecting portion 321, thereby ensuring the electrical connection between the connecting portion 321 and the electrode assembly 20 while ensuring the connection between the welding hole 311 and the accommodating cavity 11.

[0091] In some embodiments, the connection portion 321 is indirectly electrically connected to the electrode assembly 20, such as Figure 13 As shown, the energy storage device 100 includes an adapter 40 , which is a flat plate structure. The adapter 40 is located between the electrode assembly 20 and the electrode terminal 32 , and is electrically connected to the electrode assembly 20 and the welding portion 3213 .

[0092] In this way, the flow capacity between the electrode assembly 20 and the connecting portion 321 can be guaranteed based on the adapter 40. At the same time, based on the plane of the adapter 40, the stability of the electrical connection between the connecting portion 321 and the adapter 40 is guaranteed, thereby ensuring the stability of the electrical connection between the connecting portion 321 and the electrode assembly 20. In addition, the adapter 40 based on the flat structure avoids bending of the adapter 40 when assembling the energy storage device 100, thereby reducing the complexity of assembly and improving assembly efficiency.

[0093] Among them, the connecting part 321 can completely cover the welding hole 311, so as to increase the contact area between the connecting part 321 and the adapter 40, thereby ensuring the stability of the electrical connection between the connecting part 321 and the adapter 40; of course, the connecting part 321 can also partially cover the welding hole 311. At this time, the electrical connection with the electrode assembly 20 can be achieved based on the part of the connecting part 321 that covers the welding hole 311, and at the same time, based on the area of the welding hole 311 that is not blocked by the connecting part 321, the welding hole 311 and the accommodating cavity 11 can be connected, thereby realizing the injection of electrolyte along the welding hole 311, or the gas in the accommodating cavity 11 flows to the welding hole 311.

[0094] In some embodiments, the seal 33 comprises an explosion-proof valve, such as Figure 9 、 Figure 10 and Figure 13 As shown, the adapter 40 has a first vent hole 41, and at least part of the edge of the connection portion 321 projected on the cover plate 31 is located in the area surrounded by the welding hole 311. The accommodating cavity 11, the first vent hole 41 and the welding hole 311 are connected in sequence.

[0095] In this way, at least part of the edge of the connecting portion 321 is arranged to be located in the area surrounded by the welding hole 311, so that the connecting portion 321 partially blocks the welding hole 311, so as to facilitate the alignment connection between the connecting portion 321 and the adapter 40. At the same time, based on the channel of the welding hole 311 that is not blocked by the connecting portion 321, combined with the first air vent 41 on the adapter 40, communication with the accommodating chamber 11 is achieved to ensure the reliability of the opening of the sealing member 33 (explosion-proof valve).

[0096] The specific structure of the connection portion 321 partially shielding the welding hole 311 can be referred to the above embodiment, and will not be described in detail in this application.

[0097] It should be noted that when the sealing member 33 includes an explosion-proof valve, in addition to the above-described situation, the connecting portion 321 may also include a second air vent 3211 to partially block the welding hole 311. This allows the connecting portion 321 to partially block the welding hole 311, thereby ensuring that the connecting portion 321 is electrically connected to the electrode assembly 20 while ensuring that the accommodating cavity 11, the first air vent 41, the second air vent 3211, and the welding hole 311 are sequentially connected. In addition, the first air vent 41 on the adapter 40 and the second air vent 3211 on the connecting portion 321 may be one or more, thereby increasing the connection area between the accommodating cavity 11 and the welding hole 311 and improving the injection rate or exhaust rate.

[0098] In the embodiment of the present application, for the adapter 40 included in the energy storage device 100, the planar area of the adapter 40 may be electrically connected to the connecting portion 321, or the adapter 40 may have a raised area facing the cover plate 31, and the raised area of the adapter 40 may be electrically connected to the connecting portion 321.

[0099] Among them, in the case where the adapter 40 is electrically connected to the connecting portion 321 in the plane area, combined with the first vent hole 41 on the adapter 40, when at least part of the edge of the orthographic projection of the connecting portion 321 on the cover plate 31 is located within the area surrounded by the welding hole 311, due to the spacing of the connecting portion 321, a flow channel is formed between the adapter 40 and the cover plate 31. At this time, the first vent hole 41 can be set to be located in an area outside the orthographic projection of the connecting portion 321 on the adapter 40 (that is, the orthographic projection on the adapter 40). domain, so as to ensure that the accommodating cavity 11 and the welding hole 311 are connected through the first air vent 41; and when the connecting portion 321 has the second air vent 3211, due to the fit between the connecting portion 321 and the adapter 40, the orthographic projections of the first air vent 41 and the second air vent 3211 on the adapter 40 can be set to have an overlapping area (for example, the first air vent 41 and the second air vent 3211 are directly opposite to each other), so as to ensure that the accommodating cavity 11 and the welding hole 311 are connected through the first air vent 41 and the second air vent 3211.

[0100] Among them, in the case where the adapter 40 has a raised area, and the raised area of the adapter 40 is electrically connected to the connecting portion 321, combined with the first air vent 41 on the adapter 40, when at least part of the edge of the positive projection of the connecting portion 321 on the cover plate 31 is located in the area surrounded by the welding hole 311, due to the spacing between the connecting portion 321 and the raised area, a flow channel is formed between the adapter 40 and the cover plate 31. At this time, the first air vent 41 can be set to be located in a non-contact area on the adapter 40 and the connecting portion 321 (for example, the first air vent 41 is set on a plane area on the adapter 40 except the raised area) to ensure that the accommodating cavity 11 and the welding hole 311 are connected through the first air vent 41; and when the connecting portion 321 has a second air vent 3211, due to the fit between the connecting portion 321 and the raised area on the adapter 40, if the orthographic projection of the second air hole 3211 on the adapter 40 extends out of the raised area, the first air hole 41 can be set to be located in the non-contact area of the adapter 40 with the connecting portion 321 (for example, the first air hole 41 is set in the plane area of the adapter 40 except the raised area). If the raised area completely blocks the second air hole 3211, the first air hole 41 can be set to be located in the raised area, and there is an overlapping area with the orthographic projection of the second air hole 3211 on the adapter 40 (for example, the first air hole 41 is directly opposite to the second air hole 3211), so as to ensure that the accommodating cavity 11 and the welding hole 311 are connected through the first air hole 41 and the second air hole 3211.

[0101] Next, the raised area on the adapter 40 will be explained in detail.

[0102] In some embodiments, as Figure 13 and Figure 14 As shown, the adapter 40 is disc-shaped and has a plurality of protrusions 42 facing the cover plate 31 and distributed along its circumference at intervals. One of the plurality of protrusions 42 is connected to the connecting portion 321 at the welding hole 311 .

[0103] In this way, by setting the protrusion 42 and based on the electrical connection between the protrusion 42 and the connecting part 321, the flatness of the adapter 40 relative to the connecting part 321 is ensured, thereby ensuring the reliability of the electrical connection between the adapter 40 and the connecting part 321; in addition, based on the connection between any one of the multiple protrusions 42 and the connecting part 321, it is convenient to improve the alignment efficiency of the connecting part 321 and the adapter 40, thereby improving the connection efficiency between the connecting part 321 and the adapter 40.

[0104] The protrusion 42 can be a linear structure extending radially along the adapter 40, or a circular arc structure extending circumferentially along the adapter 40. When the protrusion 42 is an arc structure, the probability of the protrusion 42 being exposed at the welding hole 311 is increased, thereby further improving the alignment efficiency between the connecting portion 321 and the adapter 40.

[0105] Alternatively, as Figure 13 As shown, the welding hole 311 is an oblong hole, and the length direction of the welding hole 311 is perpendicular to the radial direction of the adapter 40. In this way, combined with the arc-shaped protrusion 42, the exposed area of the protrusion 42 at the welding hole 311 is increased, thereby increasing the connection area between the connecting portion 321 and the protrusion 42, thereby improving the stability of the connection between the connecting portion 321 and the adapter 40.

[0106] In some embodiments, as Figure 14 and Figure 15 As shown, the cover plate 31 has at least one convex bump 312 facing the electrode assembly 20 , one of the plurality of protrusions 42 is electrically connected to the connecting portion 321 , and each of the remaining protrusions 42 abuts against one of the convex bumps 312 .

[0107] In this way, by each of the remaining protrusions 42 abutting against a bulge 312, the positional stability between the adapter 40 and the cover plate 31 is ensured, thereby ensuring the abutment effect between the connecting portion 321 and the adapter 40, that is, ensuring the reliability of the electrical connection between the connecting portion 321 and the adapter 40.

[0108] In combination with the above-mentioned structure of the cover plate 31 , the first insulating member 317 may have at least one convex hump 312 facing the electrode assembly 20 .

[0109] In some embodiments, as Figure 13 As shown, the adapter 40 also has a plurality of grooves 43 facing the cover plate 31. In this way, the provision of the grooves 43 can improve the flatness of the adapter 40 when electrically connected to the electrode assembly 20, thereby improving the reliability of the electrical connection between the adapter 40 and the motor assembly.

[0110] For example, Figure 13 As shown, the adapter 40 is disc-shaped and has a plurality of grooves 43 extending radially and spaced apart along the circumference. In combination with the above-mentioned case where the adapter 40 has a plurality of protrusions 42, it can be as follows Figure 13 As shown, the protrusions 42 and the grooves 43 are alternately distributed in the circumferential direction of the adapter 40 .

[0111] 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 16 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, combined with the above, the electrical device 400 of the present application can effectively ensure the safety of the electrical device 400 during use.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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 energy storage device (100), characterized in that: include: A housing (10) enclosing a receiving cavity (11) having an opening; An electrode assembly (20) is accommodated in the accommodating cavity (11); An end cap assembly (30) comprises a cover plate (31), an electrode terminal (32), and a sealing member (33); the cover plate (31) seals the opening of the accommodating cavity (11) and has a welding hole (311) communicating with the accommodating cavity (11); the electrode terminal (32) is disposed on the cover plate (31); the end of the electrode terminal (32) facing the electrode assembly (20) has a connecting portion (321); the connecting portion (321) has a welding portion (3213) exposed at the welding hole (311); the welding portion (3213) is welded to the electrode assembly (20); and the sealing member (33) seals and is confined within the welding hole (311); The energy storage device (100) further includes an adapter (40), which is a flat plate structure; the adapter (40) is located between the electrode assembly (20) and the electrode terminal (32), and is welded to the electrode assembly (20) and the welding portion (3213); the adapter (40) is disc-shaped and has a plurality of protrusions (42) facing the cover plate (31) and distributed along its own circumference at intervals, the protrusions (42) being an arc-shaped structure extending along the circumference of the adapter (40), and one of the plurality of protrusions (42) is connected to the connecting portion (321) at the welding hole (311); the cover plate (31) has at least one convex bulge (312) facing the electrode assembly (20), and each of the remaining protrusions (42) of the plurality of protrusions (42) abuts against one of the convex bulges (312).

2. The energy storage device (100) according to claim 1, characterized in that The sealing component (33) includes an explosion-proof valve, the adapter (40) has a first air vent (41), the connecting portion (321) has a second air vent (3211), and the accommodating cavity (11), the first air vent (41), the second air vent (3211) and the welding hole (311) are sequentially connected.

3. The energy storage device (100) according to claim 1, characterized in that The sealing member (33) includes an explosion-proof valve, the adapter (40) has a first air vent (41), at least part of the edge of the positive projection of the connecting portion (321) on the cover plate (31) is located within the area surrounded by the welding hole (311), and the accommodating cavity (11), the first air vent (41) and the welding hole (311) are connected in sequence.

4. The energy storage device (100) according to claim 1, characterized in that The welding hole (311) is an oblong hole, and the length direction of the welding hole (311) is perpendicular to the radial direction of the adapter (40).

5. The energy storage device (100) according to any one of claims 1 to 4, characterized in that: The cover plate (31) has a limiting groove (313) facing the electrode assembly (20), and the connecting portion (321) is limited in the limiting groove (313); Alternatively, the cover plate (31) has a pair of limiting bars (314) facing the electrode assembly (20), the limiting bars (314) extending along the length direction of the connecting portion (321), and the connecting portion (321) is limited between the pair of limiting bars (314).

6. The energy storage device (100) according to any one of claims 1 to 4, characterized in that: The cover plate (31) has a limiting column (315) facing the electrode assembly (20); the connecting portion (321) has a limiting hole (3212); and the limiting column (315) is located in the limiting hole (3212).

7. The energy storage device (100) according to any one of claims 1 to 4, characterized in that: The hole wall of the welding hole (311) has a step surface (3111) facing away from the electrode assembly (20), and the sealing member (33) is supported on the step surface (3111).

8. An electrical device (400), characterized in that: The electric device (400) comprises the energy storage device (100) according to any one of claims 1 to 7, and the energy storage device (100) supplies power to the electric device (400).

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