Energy storage device and electric equipment

Abstract

The invention discloses an energy storage device and electric equipment, and relates to the technical field of energy storage. The energy storage device comprises a shell which defines a containing cavity with an opening; the electrode assembly is accommodated in the accommodating cavity; the end cover assembly comprises a cover plate, an electrode terminal and a sealing piece, the cover plate seals the opening of the containing cavity and is provided with a welding hole communicated with the containing cavity, the electrode terminal is arranged on the cover plate in a penetrating mode, the end, facing the electrode assembly, of the electrode terminal is provided with a connecting part, the connecting part is provided with a welding part exposed at the welding hole, and the welding part is electrically connected with the electrode assembly; and the sealing piece is sealed and limited in the welding hole. In the embodiment of the invention, after the cover plate seals the opening of the shell, electrical connection between the connecting part and the electrode assembly can be completed at the welding hole, and then the sealing piece is used for sealing the welding hole to complete assembly of the energy storage device, so that the assembly efficiency is improved, and the service life of the energy storage device is ensured.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and more particularly, to an energy storage device and an electrical device. Background Art

[0002] A secondary battery (Rechargeable battery), also known as a rechargeable battery or a storage battery, refers to a battery that can be activated by charging after discharging and can be reused. The recyclable characteristics of secondary batteries have gradually made them the main power source of electrical devices. As the demand for secondary batteries increases, people's requirements for various aspects of their performance are also getting higher and higher, especially for the service life.

[0003] In the related art, a secondary battery usually consists of a housing, an electrode assembly, and an end cap assembly. In the actual production process, the housing, the electrode assembly, and the end cap assembly are manufactured separately. Then, the electrode terminal included in the end cap assembly and the first tab of the electrode assembly are electrically connected by welding. Next, the electrode assembly is placed into the housing, and the electrode assembly is electrically connected to the bottom of the housing, and the opening of the housing is sealed with the end cap assembly to complete the basic structure of the secondary battery.

[0004] Among them, the end cap assembly includes a cover plate, and the electrode terminal is passed through the cover plate. When assembling the secondary battery, a bendable adapter is first used to be electrically connected to the electrode terminal and the electrode assembly respectively. After the electrode assembly is inserted into the housing, the adapter is bent to seal the opening of the housing with the cover plate. The bending of the adapter not only increases the assembly complexity of the secondary battery, but also due to the bending effect of the adapter, the adapter will bear a pulling force after the cover plate seals the housing, shortening the service life of the secondary battery. Summary of the Invention

[0005] A main object of this application is to provide an energy storage device and an electrical device that improve the assembly efficiency and ensure the service life.

[0006] To achieve the above application objectives, the following technical solutions are adopted in this application: According to one aspect of this application, there is provided an energy storage device, including: a housing, enclosing a receiving cavity with an opening; an electrode assembly, received in the receiving cavity; an end cap assembly, including a cover plate, an electrode terminal, and a seal, the cover plate sealing the opening of the receiving cavity and having a welding hole communicating with the receiving cavity, the electrode terminal passing through the cover plate, an end of the electrode terminal facing the electrode assembly having a connecting portion, the connecting portion having a welding portion exposed at the welding hole, the welding portion being electrically connected to the electrode assembly, and the seal sealing and being limited in the welding hole.

[0007] In the embodiment of the present application, after the cover plate seals the opening of the housing, the electrical connection between the connecting portion and the electrode assembly can be completed at the welding hole, and then the welding hole can be sealed with a sealing member to complete the assembly of the energy storage device, thereby improving the assembly efficiency and ensuring the service life of the energy storage device.

[0008] According to an embodiment of the present application, the energy storage device further includes an adapter. The adapter is in a flat plate structure. The adapter is located between the electrode assembly and the electrode terminal, and is electrically connected to the electrode assembly and electrically connected to the welding portion.

[0009] In the embodiment of the present application, by providing the adapter, the current-carrying capacity between the electrode assembly and the connecting portion is ensured. 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, and further the stability of the electrical connection between the connecting portion and the electrode assembly is ensured. In addition, based on the flat plate-shaped adapter, the bending of the adapter during the assembly of the energy storage device is avoided, which is convenient for reducing the assembly complexity and improving the assembly efficiency.

[0010] According to an embodiment of the present application, the sealing member includes an explosion-proof valve. The adapter has a first air vent, and the connecting portion has a second air vent. The accommodation cavity, the first air vent, the second air vent, and the welding hole are communicated in sequence.

[0011] In the 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 realize the partial shielding of the welding hole by the connecting portion, which is convenient for the alignment connection between the connecting portion and the adapter. At the same time, based on the unobstructed channel of the welding hole not blocked by the connecting portion, combined with the first air vent on the adapter, the communication with the accommodation cavity is realized to ensure the reliability of the opening of the sealing member.

[0012] According to an embodiment of the present application, the sealing member includes an explosion-proof valve. The adapter has a first air vent, and at least part of the edge of the projection of the connecting portion on the cover plate is located within the area surrounded by the welding hole. The accommodation cavity, the first air vent, and the welding hole are communicated in sequence.

[0013] According to an embodiment of the present application, the adapter is in a disc shape and has a plurality of protrusions that face the cover plate and are spaced apart along the circumference of the adapter itself. One of the plurality of protrusions is connected to the connecting portion at the welding hole.

[0014] In the embodiment of the present application, through the provision of the protrusions and based on the electrical connection between the protrusions and the connecting portion, the flatness of the adapter relative to the connecting portion is ensured, thereby ensuring the reliability of the electrical connection between the adapter and the connecting portion. Additionally, since any one of the multiple protrusions is connected to the connecting portion, it is convenient to improve the alignment efficiency between the connecting portion and the adapter, and thus improve the connection efficiency between the connecting portion and the adapter.

[0015] According to an embodiment of the present application, wherein the protrusion is an arc-shaped structure extending along the circumferential direction 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.

[0016] According to an embodiment of the present application, wherein the cover plate has at least one convex hull facing the electrode assembly, one of the multiple protrusions is electrically connected to the connecting portion, and each of the remaining protrusions abuts against one of the convex hulls respectively.

[0017] In the embodiment of the present application, by each of the remaining protrusions abutting against one of the convex hulls respectively, it is convenient to ensure the position stability between the adapter and the cover plate, and thus ensure the abutting effect between the connecting portion and the adapter, that is, ensure the reliability of the electrical connection between the connecting portion and the adapter.

[0018] According to an embodiment of the present application, wherein the seal includes an explosion-proof valve; at least part of the edge of the projection of the connecting portion on the cover plate is located within the area surrounded by the welding hole, and the accommodation cavity communicates with the welding hole; and / or, the connecting portion has a second ventilation hole, and the second ventilation hole communicates the accommodation cavity and the welding hole.

[0019] In the embodiment of the present application, by setting at least part of the edge of the connecting portion to be located within the area surrounded by the welding hole, the connecting portion locally shields the welding hole, so as to facilitate the alignment connection between the connecting portion and the electrode assembly, and at the same time ensure the communication between the welding hole and the accommodation cavity to ensure the reliability of the opening of the seal.

[0020] According to an embodiment of the present application, wherein the cover plate has a limiting groove facing the electrode assembly, and the connecting portion is limited within the limiting groove; or, the cover plate has a pair of limiting strips facing the electrode assembly, the limiting strips extend along the length direction of the connecting portion, and the connecting portion is limited between the pair of limiting strips.

[0021] In the embodiment of the present application, when the electrode terminal is inserted through the cover plate, based on the provision of the limiting groove or the limiting strips, the relative position of the connecting portion with respect to the cover plate can be limited, and thus at least part of the connecting portion is exposed at the welding hole, so as to improve the assembly efficiency of the electrode terminal and the cover plate.

[0022] According to an embodiment of the present application, the cover plate has a limiting post facing the electrode assembly, the connecting portion has a limiting hole, and the limiting post is located in the limiting hole.

[0023] According to an embodiment of the present application, the hole wall of the welding hole has a stepped surface facing away from the electrode assembly, and the seal is supported on the stepped surface.

[0024] According to an aspect of the present application, there is provided an electrical device, which includes the energy storage device described in the above aspect, and the energy storage device supplies power to the electrical device.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By referring to the drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present application will become more obvious.

[0027] Figure 1 is a schematic diagram of an energy storage system shown according to an exemplary embodiment.

[0028] Figure 2 is a top view structural schematic diagram of an energy storage device shown according to an exemplary embodiment.

[0029] Figure 3 is Figure 2 a schematic cross-sectional structural diagram of the energy storage device shown along A-A`.

[0030] Figure 4 is an axonometric exploded structural schematic diagram of an end cap assembly shown according to an exemplary embodiment.

[0031] Figure 5 is Figure 3 a magnified structural schematic diagram of the energy storage device in the B1 area shown.

[0032] Figure 6 is a bottom view structural schematic diagram of an end cap assembly shown according to an exemplary embodiment.

[0033] Figure 7 is a bottom view structural schematic diagram of another end cap assembly shown according to an exemplary embodiment.

[0034] Figure 8 is a bottom view structural schematic diagram of yet another end cap assembly shown according to an exemplary embodiment.

[0035] Figure 9 is a top view structural schematic diagram of an end cap assembly shown according to an exemplary embodiment.

[0036] Figure 10 is Figure 9 The upward view structural schematic diagram of the end cap assembly shown in the figure.

[0037] Figure 11 is the top view structural schematic diagram of another end cap assembly shown according to an exemplary embodiment.

[0038] Figure 12 is Figure 10 The upward view structural schematic diagram of the end cap assembly shown in the figure.

[0039] Figure 13 is the axonometric exploded structural schematic diagram of an end cap assembly and an adapter shown according to an exemplary embodiment.

[0040] Figure 14 is an end cap assembly and an adapter along according to an exemplary embodiment shown in Figure 2 The sectional structural schematic diagram of A-A` shown in the figure.

[0041] Figure 15 is Figure 14 The enlarged structural schematic diagram of the sectional structural schematic diagram shown in the figure in area B2.

[0042] Figure 16 is the structural schematic diagram of an electrical equipment shown according to an exemplary embodiment.

[0043] Among them, the reference numerals are explained as follows: 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment; 10, housing; 20, electrode assembly; 30, end cap assembly; 40, adapter; 11, accommodation cavity; 31, cover plate; 32, electrode terminal; 33, seal; 34, sealing ring; 311, welding hole; 312, convex hull; 313, limiting groove; 314, limiting strip; 315, limiting post; 316, body plate; 317, first insulating part; 3111, step surface; 321, connecting part; 322, electrode post; 323, second insulating part; 324, riveting press block; 3211, second ventilation hole; 3212, limiting hole; 3213, welding part; 41, first ventilation hole; 42, protrusion; 43, groove. Detailed implementation manners

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed description will be omitted.

[0045] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve utilization efficiency, it is necessary to store one form of energy in the same form of energy or convert it into another form of energy through a medium or device, and then release it in a specific form of energy based on future applications.

[0046] Currently, green energy mainly includes light energy, wind energy, etc. However, light energy, wind energy, etc. 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 electricity consumption and too much electricity during low electricity consumption), and the unstable voltage will damage the power. Therefore, the problem of "abandoning wind and light" may be caused due to insufficient electricity demand or insufficient grid acceptance capacity.

[0047] To solve the problems of insufficient electricity demand or insufficient grid acceptance capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electrical energy is converted into other forms of energy through physical or chemical means and stored, and then the energy stored in the energy storage devices is converted back into electrical energy and released when needed. Simply put, an energy storage device is similar to a large "power bank", which stores electrical energy when light energy and wind energy are sufficient and releases the stored electrical energy when needed.

[0048] Currently, the application scenarios of current energy storage (i.e., energy storage) are relatively wide, including power generation side energy storage, grid side energy storage, renewable energy grid connection energy storage, and user side energy storage, etc. The types of corresponding energy storage devices include: (1) Large energy storage containers applied on the grid side, which can be used as high-quality active and reactive power regulation power sources in the grid, realize the load matching of electrical energy in time and space, enhance the consumption capacity of renewable energy, and are of great significance in grid system standby, alleviating the power supply pressure of peak loads, and peak shaving and frequency modulation. (2) Small and medium-sized energy storage cabinets applied to industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and household small energy storage boxes applied to household energy storage scenarios on the user side mainly operate in the mode of "peak shaving and valley filling". Due to the large price difference in electricity charges at peak and valley positions according to electricity consumption demand, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage devices (energy storage cabinets / boxes) during the low electricity price period; during the high electricity price period, they release the electricity in the energy storage devices for use to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidences of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0049] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store electrical energy or supply electrical energy through the energy storage device.

[0050] Taking the household energy storage scenario on the user side as an example, Figure 1 FIG. shows a schematic diagram of an energy storage system provided by an embodiment of the present application. The energy storage system includes an energy storage device 100 and an electrical energy conversion device 200 (such as a photovoltaic panel), as well as a user load 300 (such as street lights, household appliances, etc.). The electrical 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 and can be installed on an outdoor wall by a wall-mounted method. Specifically, the electrical energy conversion device 200 can convert solar energy into electrical energy and store it through the energy storage device 100, and then supply it to the user load 300 for use during peak electricity prices, or supply it to the user load 300 for use when the power grid is powered off / out of power.

[0051] Among them, the energy storage device 100 can be, but is not limited to, a single battery (secondary battery), as well as a battery module, a battery pack, a battery system, etc. composed of single batteries. The battery monomer 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 monomer can be in the shape of a cylinder, a flat body, a cuboid, etc. The embodiment of the present application does not make any limitations in this regard. Specifically, the battery monomer can achieve the charge and discharge process by using the chemical reaction or change of the energy storage medium (chemical element). Simply put, the electrical energy generated by light energy and wind energy is stored in the battery monomer through the chemical reaction or change of the energy storage medium, and then the electrical energy stored in the battery monomer is released for use or transferred for use through the chemical reaction or change of the energy storage medium when the use of external electrical energy reaches a peak.

[0052] In some embodiments, such as Figure 2 and Figure 3As shown in the figure, the energy storage device 100 includes: a housing 10, an electrode assembly 20, and an end cap assembly 30. The housing 10 defines a receiving cavity 11 with an opening. The electrode assembly 20 is disposed in the receiving cavity 11, and the end cap assembly 30 seals the opening of the receiving cavity 11.

[0053] Among them, the housing 10 can be a cylindrical structure with one end open. In this case, the energy storage device 100 includes one end cap assembly 30 to seal one opening of the housing 10. Of course, the housing 10 can also be a cylindrical structure with both ends open. In this case, the energy storage device 100 includes one end cap assembly 30 and one end plate, or includes two end cap assemblies 30 to seal the two openings of the housing 10 through one end cap assembly 30 and one end plate, or two end cap assemblies 30 respectively.

[0054] Among them, as Figure 4 shown, the end cap assembly 30 includes a cover plate 31 and an electrode terminal 32. The electrode terminal 32 penetrates through the cover plate 31, and one end is exposed inside the receiving cavity 11, and the other end is exposed outside the receiving cavity 11. There may be electrical insulation between the electrode terminal 32 and the cover plate 31. Exemplarily, as Figure 4 shown, the cover plate 31 includes a body plate 316 (such as a light aluminum sheet) and a first insulating member 317 (such as a lower plastic). The electrode terminal 32 includes an electrode post 322 and a second insulating member 323 (such as an upper plastic). The body plate 316 is located between the first insulating member 317 and the second insulating member 323. The electrode post 322 sequentially passes through the first insulating member 317, the body plate 316, and the second insulating member 323, and both ends of the electrode post 322 are respectively limited on the sides of the first insulating member 317 and the second insulating member 323 facing away from the body plate 316. Further, the electrode terminal 32 may further include a riveting block 324. The end of the electrode post 322 passes through the riveting block 324 and is limited on the side of the second insulating member 323 facing away from the body plate 316 by riveting. In addition, as Figure 4 shown, the end cap assembly 30 further includes a sealing ring 34. The sealing ring 34 is sleeved on the electrode terminal 32 (electrode post 322) to achieve the seal between the electrode terminal 32 and the cover plate 31. Moreover, an explosion-proof valve may be provided on the cover plate 31 to burst when the pressure in the receiving cavity 11 is greater than the opening pressure of the explosion-proof valve, so as to discharge the gas in the receiving cavity 11 and improve the safety of the energy storage device 100 during use. A liquid injection hole may also be provided on the cover plate 31 to inject electrolyte into the receiving cavity 11 through the liquid injection hole to wet the electrode assembly 20.

[0055] The electrode assembly 20 includes a first electrode sheet, a second electrode sheet and a diaphragm which are stacked, the first electrode sheet and the second electrode sheet have opposite polarities, and the diaphragm is located between the first electrode sheet and the second electrode sheet, and the end of the electrode assembly 20 has a first electrode ear and a second electrode ear with opposite polarities, and the first electrode ear and the second electrode ear can be located at the same end of the electrode assembly 20, or at different ends of the electrode assembly 20. Taking the first electrode ear and the second electrode ear located at both ends of the electrode assembly 20, and the shell 10 being a cylindrical structure with one end open as an example, one of the first electrode ear and the second electrode ear 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 shell 10, so as to realize the output of electric energy through the electrode terminal 32 of the end cap assembly 30 and the bottom of the shell 10.

[0056] It should be noted that the energy storage device 100 may also include an adapter 40 (such as a current collecting plate, etc.) to respectively connect the first pole ear and the second pole ear of the electrode assembly 20 to the electrode terminal 32 and the bottom of the shell 10 through two adapters 40, thereby ensuring the current 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.

[0057] In the related art, when the adapter 40 is used to connect the electrode assembly 20 and the electrode terminal 32, in order to facilitate the sealing of the cover plate 31 included in the end cap assembly 30 to the opening of the shell 10, the adapter 40 adopts a bendable structure. In this way, not only the assembly complexity of the energy storage device 100 is increased, but also due to the bending effect of the adapter 40, the adapter 40 is subjected to a pulling force after the cover plate 31 seals the shell 10, thereby shortening the service life of the energy storage device 100.

[0058] The embodiment of the present application provides an energy storage device 100. For the end cap assembly 30 included in the energy storage device 100, as shown in FIG. 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 sealing member 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 sealing member 33 is sealed and limited in the welding hole 311.

[0059] In this way, for the connecting portion 321 arranged on the end of the electrode terminal 32 facing the electrode assembly 20, and the welding hole 311 arranged 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.

[0060] Among them, the seal 33 included in the end cap assembly 30 may be a sealing patch. Of course, the seal 33 may also be a sealing nail. Accordingly, the welding hole 311 can be reused as a liquid injection hole; or the seal 33 at least includes an explosion-proof valve. Accordingly, the welding hole 311 can be reused as an explosion-proof hole, etc. When the seal 33 is a liquid injection hole or at least includes an explosion-proof valve, the connecting portion 321 does not completely block the welding hole 311 to ensure the communication between the welding hole 311 and the accommodating cavity 11, so as to ensure the effective injection of the electrolyte, or to cause the explosion-proof valve to burst when the pressure in the accommodating cavity 11 is greater than the opening pressure of the explosion-proof valve, so as to discharge the gas in the accommodating cavity 11 to the outside. In addition, in combination with the structure of the electrode terminal 32 described above, the connecting portion 321 is connected to the end of the electrode post 322 facing the electrode assembly 20, and the connecting portion 321 and the electrode post 322 may be an integral structure or may be fixed by welding.

[0061] It should be noted that for the case where the connecting portion 321 does not completely block the welding hole 311, please refer to the following description for details. In addition, the electrical connection described above and the electrical connection involved in the following of the present application may be one of welding, conductive agent bonding, etc.

[0062] In some embodiments, such as Figure 4 or Figure 5 shown, the hole wall of the welding hole 311 has a stepped surface 3111 facing away from the electrode assembly 20, and the seal 33 is supported on the stepped surface 3111 (i.e., the tread surface on the hole wall of the welding hole 311).

[0063] In this way, through the support of the stepped surface 3111 for the seal 33, the seal 33 has a certain support height, so as to avoid the welding mark after welding between the connecting portion 321 and the electrode assembly 20 from interfering with the assembly of the seal 33; in addition, based on the setting of the stepped surface 3111, it is convenient to realize the positioning of the seal 33 in the welding hole 311. Furthermore, based on the edge welding performed between the edge of the seal 33 and the hole wall of the welding hole 311 (i.e., the kick surface on the hole wall of the welding hole 311), the sealing and limiting of the seal 33 in the welding hole 311 can be realized.

[0064] Among them, the stepped surface 3111 of the welding hole 311 is an annular structure, and the circumferential edge of the seal 33 is supported on the stepped 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.

[0065] In some embodiments, such as Figure 6As shown, the cover plate 31 has a limiting groove 313 facing the electrode assembly 20, and the connecting portion 321 is limited within the limiting groove 313. In this way, when the electrode terminal 32 is passed through the cover plate 31, the limiting of the connecting portion 321 relative to the cover plate 31 can be achieved, and further, at least part of the connecting portion 321 is ensured to be exposed at the welding hole 311, so as to improve the assembly efficiency of the electrode terminal 32 and the cover plate 31.

[0066] Wherein, the depth of the limiting groove 313 is less than the thickness of the connecting portion 321, so as not to interfere with the electrical connection between the connecting portion 321 and the electrode assembly 20 while forming a limit on the connecting portion 321. In addition, in combination with the above-described structural composition of the cover plate 31, it may be that the surface of the first insulating member 317 facing the electrode assembly 20 has the limiting groove 313, and the depth of the limiting groove 313 is less than the thickness of the first insulating member 317, so as to ensure electrical insulation between the connecting portion 321 and the body plate 316.

[0067] Of course, in addition to providing the limiting groove 313 on the cover plate 31 to limit the connecting portion 321, it may also be as Figure 7 shown, the cover plate 31 has a pair of limiting strips 314 facing the electrode assembly 20, the limiting strips 314 extend along the length direction of the connecting portion 321, and the connecting portion 321 is limited between the pair of limiting strips 314.

[0068] Wherein, the height of the protrusion 42 of the limiting strip 314 is less than the thickness of the connecting portion 321, so as to avoid the limiting strip 314 interfering with the electrical connection between the connecting portion 321 and the electrode assembly 20. In addition, in combination with the above-described structural composition of the cover plate 31, it may be that the surface of the first insulating member 317 facing the electrode assembly 20 has a pair of limiting strips 314.

[0069] In some other embodiments, as Figure 8 shown, the cover plate 31 has a limiting post 315 facing the electrode assembly 20, the connecting portion 321 has a limiting hole 3212, and the limiting post 315 is located within the limiting hole 3212. In this way, when the electrode terminal 32 is passed through the cover plate 31, the limiting of the connecting portion 321 relative to the cover plate 31 can be achieved based on the cooperation between the limiting post 315 and the limiting hole 3212, and further, at least part of the connecting portion 321 is ensured to be exposed at the welding hole 311, so as to improve the assembly efficiency of the electrode terminal 32 and the cover plate 31.

[0070] Wherein, the height of the limiting post 315 is less than or equal to the thickness of the connecting portion 321, so as not to interfere with the electrical connection between the connecting portion 321 and the electrode assembly 20 while forming a limit on the connecting portion 321. In addition, in combination with the above-described structural composition of the cover plate 31, it may be that the surface of the first insulating member 317 facing the electrode assembly 20 has the limiting post 315.

[0071] In the embodiments of the present application, the connecting portion 321 can be directly connected to the electrode assembly 20, or can be indirectly connected to the electrode assembly 20 based on the adapter 40. Next, the two cases will be explained separately.

[0072] In some embodiments, the connecting portion 321 is directly electrically connected to the electrode assembly 20.

[0073] Among them, the connecting portion 321 can completely cover the welding hole 311, so as to increase the contact area between the connecting portion 321 and the electrode assembly 20, thereby ensuring the stability of the electrical connection between the connecting portion 321 and the electrode assembly 20; of course, the connecting portion 321 can also partially cover the welding hole 311. At this time, the electrical connection with the electrode assembly 20 can be realized based on the part of the connecting portion 321 that covers the welding hole 311, and at the same time, based on the area of the welding hole 311 that is not covered by the connecting portion 321, the communication between the welding hole 311 and the accommodating cavity 11 is realized, so as to realize the injection of the electrolyte along the welding hole 311, or the gas in the accommodating cavity 11 flows to the welding hole 311.

[0074] In some embodiments, the seal 33 includes an explosion-proof valve, such as Figure 9 and Figure 10 As shown, at least part of the edge of the 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 and the welding hole 311 are communicated; In this way, by setting at least part of the edge of the connecting portion 321 to be located within the area surrounded by the welding hole 311, partial occlusion of the welding hole 311 by the connecting portion 321 is realized, 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 to ensure the reliability of the opening of the seal 33 (explosion-proof valve).

[0075] Among them, the connecting portion 321 can be a long strip plate 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 partial occlusion of the welding hole 311 by the connecting portion 321.

[0076] Exemplarily, as Figure 9 and Figure 10 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 both ends of the welding hole 311 in the length direction are not covered by the connecting portion 321.

[0077] It should be noted that for the case where the connecting portion 321 partially obscures the welding hole 311, in addition to the above-mentioned cases, it can also be as shown in Figure 11 and Figure 12 wherein the connecting portion 321 has a second vent hole 3211, and the second vent hole 3211 communicates with the accommodating cavity 11 and the welding hole 311, so as to realize the partial occlusion of the welding hole 311 by the connecting portion 321, and further ensure the electrical connection between the connecting portion 321 and the electrode assembly 20 while ensuring the communication between the welding hole 311 and the accommodating cavity 11.

[0078] In some embodiments, the connecting portion 321 is indirectly electrically connected to the electrode assembly 20, that is, as shown in Figure 13 wherein the energy storage device 100 includes an adapter 40, and the adapter 40 is in a flat plate structure; the adapter 40 is located between the electrode assembly 20 and the electrode terminal 32, and the adapter 40 is electrically connected to the electrode assembly 20 and electrically connected to the welding portion 3213.

[0079] In this way, the current-carrying capacity between the electrode assembly 20 and the connecting portion 321 can be ensured based on the adapter 40, and 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 can be ensured, and further the stability of the electrical connection between the connecting portion 321 and the electrode assembly 20 can be ensured; in addition, based on the flat plate-shaped adapter 40, the bending of the adapter 40 during the assembly of the energy storage device 100 is avoided, which is convenient for reducing the assembly complexity and improving the assembly efficiency.

[0080] Among them, the connecting portion 321 can completely obscure the welding hole 311, so as to increase the contact area between the connecting portion 321 and the adapter 40, thereby ensuring the stability of the electrical connection between the connecting portion 321 and the adapter 40; of course, the connecting portion 321 can also partially obscure the welding hole 311. At this time, the electrical connection with the electrode assembly 20 can be realized based on the part of the connecting portion 321 that obscures the welding hole 311, and at the same time, based on the area of the welding hole 311 that is not obscured by the connecting portion 321, the communication between the welding hole 311 and the accommodating cavity 11 is realized, so as to realize the injection of the electrolyte along the welding hole 311, or the gas in the accommodating cavity 11 flows to the welding hole 311.

[0081] In some embodiments, the seal 33 includes an explosion-proof valve, as shown in Figure 9 , Figure 10 and Figure 13 wherein the adapter 40 has a first vent hole 41, 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, the first vent hole 41 and the welding hole 311 are sequentially communicated.

[0082] 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 as to realize the partial shielding of the welding hole 311 by the connecting portion 321, which is convenient for the alignment connection between the connecting portion 321 and the adapter 40. At the same time, based on the passage of the welding hole 311 not blocked by the connecting portion 321, combined with the first vent hole 41 on the adapter 40, the communication with the accommodation cavity 11 is realized to ensure the reliability of the opening of the seal 33 (explosion-proof valve).

[0083] Among them, the specific structure of the partial shielding of the welding hole 311 by the connecting portion 321 can refer to that described in the above embodiments, and the present application will not elaborate on this.

[0084] It should be noted that when the seal 33 includes an explosion-proof valve, for the case where the connecting portion 321 partially shields the welding hole 311, in addition to the above-mentioned case, there may also be a second vent hole 3211 on the connecting portion 321 to realize the partial shielding of the welding hole 311 by the connecting portion 321. Furthermore, while ensuring the electrical connection between the connecting portion 321 and the electrode assembly 20, it is ensured that the accommodation cavity 11, the first vent hole 41, the second vent hole 3211, and the welding hole 311 are connected in sequence. In addition, for the first vent hole 41 on the adapter 40 and the second vent hole 3211 on the connecting portion 321, there may be one or more of each, so as to increase the communication area between the accommodation cavity 11 and the welding hole 311 and improve the liquid injection rate or the exhaust rate.

[0085] In the embodiments of the present application, for the adapter 40 included in the energy storage device 100, the flat area of the adapter 40 may be electrically connected to the connecting portion 321, or the adapter 40 may have a convex area facing the cover plate 31, and the convex area of the adapter 40 is electrically connected to the connecting portion 321.

[0086] Among them, for the case where the flat area of the adapter 40 is electrically connected to the connecting portion 321, combined with the first vent hole 41 on the adapter 40, when at least part of the edge of the 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 interval 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 in the area outside the projection of the connecting portion 321 on the adapter 40 (i.e., the projection on the adapter 40) to ensure the communication between the accommodation cavity 11 and the welding hole 311 through the first vent hole 41; and when the connecting portion 321 has a second vent hole 3211, due to the fitting of the connecting portion 321 and the adapter 40, at this time, the first vent hole 41 and the second vent hole 3211 can be set to have an overlapping area in the projection on the adapter 40 (for example, the first vent hole 41 and the second vent hole 3211 are directly opposite) to ensure the communication between the accommodation cavity 11 and the welding hole 311 through the first vent hole 41 and the second vent hole 3211.

[0087] Among them, for the case where the adapter 40 has a convex area and the convex area of the adapter 40 is electrically connected to the connecting portion 321, in combination with the first ventilation holes 41 provided on the adapter 40, when at least part of the edge of the projection of the connecting portion 321 on the cover plate 31 is located within the area surrounded by the welding holes 311, due to the interval between the connecting portion 321 and the convex area, a flow channel is formed between the adapter 40 and the cover plate 31. At this time, the first ventilation holes 41 can be arranged in the non-contact area of the adapter 40 with respect to the connecting portion 321 (for example, the first ventilation holes 41 are arranged in the flat area of the adapter 40 except the convex area) to ensure that the accommodating cavity 11 and the welding holes 311 are communicated through the first ventilation holes 41. When the connecting portion 321 has second ventilation holes 3211, due to the fitting of the connecting portion 321 with the convex area on the adapter 40, if the projection of the second ventilation holes 3211 on the adapter 40 extends out of the convex area, the first ventilation holes 41 can be arranged in the non-contact area of the adapter 40 with respect to the connecting portion 321 (for example, the first ventilation holes 41 are arranged in the flat area of the adapter 40 except the convex area). If the convex area completely blocks the second ventilation holes 3211, the first ventilation holes 41 can be arranged in the convex area and there is an overlapping area with the projection of the second ventilation holes 3211 on the adapter 40 (for example, the first ventilation holes 41 are directly opposite to the second ventilation holes 3211) to ensure that the accommodating cavity 11 and the welding holes 311 are communicated through the first ventilation holes 41 and the second ventilation holes 3211.

[0088] Next, a detailed explanation of the convex area on the adapter 40 will be given.

[0089] In some embodiments, as Figure 13 and Figure 14 shown, the adapter 40 is in a disc shape and has a plurality of protrusions 42 that face the cover plate 31 and are circumferentially spaced apart along its own circumference. One of the plurality of protrusions 42 is connected to the connecting portion 321 at the welding holes 311.

[0090] In this way, it is convenient to ensure the flatness of the adapter 40 relative to the connecting portion 321 through the arrangement of the protrusions 42 and based on the electrical connection between the protrusions 42 and the connecting portion 321, thereby ensuring the reliability of the electrical connection between the adapter 40 and the connecting portion 321. In addition, based on the connection of any one of the plurality of protrusions 42 to the connecting portion 321, it is convenient to improve the alignment efficiency of the connecting portion 321 and the adapter 40, and further improve the connection efficiency of the connecting portion 321 and the adapter 40.

[0091] Among them, the protrusion 42 can be a linear structure extending along the radial direction of the adapter 40, or an arc-shaped structure extending along the circumferential direction of the adapter 40. When the protrusion 42 is an arc-shaped structure, it is convenient to increase the probability of the protrusion 42 being exposed at the welding holes 311, and further improve the alignment efficiency of the connecting portion 321 and the adapter 40.

[0092] Optionally, as shown in Figure 13 FIG. [not provided], 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 convex 42 of the arc structure, it is convenient to increase the exposed area of the convex 42 at the welding hole 311, and further convenient to increase the connection area between the connecting portion 321 and the convex 42, so as to improve the connection stability between the connecting portion 321 and the adapter 40.

[0093] In some embodiments, as shown in Figure 14 and Figure 15 FIG. [not provided], the cover plate 31 has at least one convex hull 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 a convex hull 312 respectively.

[0094] In this way, by the abutment of each of the remaining protrusions 42 against a convex hull 312 respectively, it is convenient to ensure the position stability between the adapter 40 and the cover plate 31, and further ensure the abutment effect between the connecting portion 321 and the adapter 40, that is, ensure the reliability of the electrical connection between the connecting portion 321 and the adapter 40.

[0095] Among them, in combination with the above-mentioned structure of the cover plate 31, it may be that the first insulating member 317 has at least one convex hull 312 facing the electrode assembly 20.

[0096] In some embodiments, as shown in Figure 13 FIG. [not provided], the adapter 40 further has a plurality of grooves 43 facing the cover plate 31. In this way, through the arrangement of the grooves 43, the flatness when the adapter 40 is electrically connected to the electrode assembly 20 can be improved, thereby improving the reliability of the electrical connection between the adapter 40 and the motor assembly.

[0097] Exemplarily, as shown in Figure 13 FIG. [not provided], the adapter 40 is in a disc shape and has a plurality of grooves 43 extending in the radial direction and distributed at intervals in the circumferential direction. And in combination with the above-mentioned situation that the adapter 40 has a plurality of protrusions 42, it may be as shown in Figure 13 FIG. [not provided], in the circumferential direction of the adapter 40, the protrusions 42 and the grooves 43 are alternately distributed.

[0098] The embodiment of the present application further provides an electrical device 400, and the electrical device 400 may be a user energy storage cabinet, an energy storage container, etc. As shown in Figure 16 FIG. [not provided], 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. In this way, in combination with the above, during the use of the electrical device 400 of the present application, the safety of the use of the electrical device 400 can be effectively guaranteed.

[0099] It should be noted that the figures are not provided in the original text, so "FIG. [not provided]" is used in the translation to indicate the missing figure references.In the embodiments of the present application, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "plural" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" 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 specific circumstances.

[0100] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0101] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0102] The above are only the preferred embodiments of the embodiments of the present application and are not used to limit the embodiments of the present application. For those skilled in the art, various changes and modifications can be made to the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included within the protection scope of the embodiments of the present application.

Claims

1. An energy storage device (100), characterized in that: include: A housing (10) enclosing a receiving chamber (11) having an opening; An electrode assembly (20) accommodated in the accommodation 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 an opening of the accommodating cavity (11) and has a welding hole (311) communicating with the accommodating cavity (11); the electrode terminal (32) is inserted through the cover plate (31); an 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 electrically connected to the electrode assembly (20); and the sealing member (33) seals and is limited in position within the welding hole (311).

2. The energy storage device (100) according to claim 1, characterized in that: The energy storage device (100) further comprises a transition piece (40), wherein the transition piece (40) is a flat plate-shaped structure; The adapter (40) is located between the electrode assembly (20) and the electrode terminal (32); the adapter (40) is electrically connected to the electrode assembly (20) and is also electrically connected to the welding portion (3213).

3. The energy storage device (100) according to claim 2, characterized in that: The sealing component (33) comprises 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.

4. The energy storage device (100) according to claim 2, characterized in that: The sealing component (33) comprises an explosion-proof valve, the adapter (40) has a first air vent (41), 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), the first air vent (41) and the welding hole (311) are sequentially connected.

5. The energy storage device (100) according to claim 2, characterized in that: The adapter (40) is disc-shaped and has a plurality of protrusions (42) facing the cover plate (31) and distributed at intervals along its own circumference, and one protrusion (42) among the plurality of protrusions (42) is connected to the connection portion (321) at the welding hole (311).

6. The energy storage device (100) according to claim 5, characterized in that: The protrusion (42) is an arc-shaped structure extending along the circumference of the adapter (40); 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).

7. The energy storage device (100) according to claim 5, characterized in that: The cover plate (31) has at least one bulge (312) facing the electrode assembly (20), one of the plurality of bulges (42) is electrically connected to the connecting portion (321), and each of the remaining bulges (42) is respectively in contact with one of the bulges (312).

8. The energy storage device (100) according to claim 1, characterized in that: The sealing member (33) comprises an explosion-proof valve; At least part of the edge of the orthographic projection of the connection portion (321) on the cover plate (31) is located within the area surrounded by the welding hole (311), and the accommodating cavity (11) and the welding hole (311) are in communication; And / or, the connecting portion (321) has a second air vent (3211), and the second air vent (3211) is connected to the accommodating cavity (11) and the welding hole (311).

9. The energy storage device (100) according to any one of claims 1 to 8, 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).

10. The energy storage device (100) according to any one of claims 1 to 8, 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).

11. The energy storage device (100) according to any one of claims 1 to 8, 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).

12. An electrical device (400), characterized in that: The electrical device (400) comprises the energy storage device (100) according to any one of claims 1 to 11 above, and the energy storage device (100) supplies power to the electrical device (400).

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