Energy storage device and electric equipment

Abstract

The utility model discloses an energy storage device and electric equipment, and relates to the technical field of energy storage. The energy storage device comprises a shell, a first end cover assembly, an electrode assembly, a first adapter and a clamping piece, the first adapter is connected with the electrode assembly and the first end cover assembly, the end, close to the first adapter, of the electrode assembly is sleeved with the clamping piece, and at least part of the clamping piece is located between the electrode assembly and the first adapter. In the embodiment of the invention, the end part of the electrode assembly is sleeved with the clamping piece, and the clamping piece is limited after the first adapter is connected with the electrode assembly, so that when the electrode assembly is arranged in the accommodating cavity of the shell, the consistency of a gap between the electrode assembly and the inner wall of the shell can be ensured through the clamping piece; and therefore, the coaxiality deviation of the electrode assembly and the shell is reduced while ensuring that the electrode assembly has enough expansion space after being soaked in the electrolyte, so that the assembly yield of the energy storage device is ensured.

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 to activate the active materials and continue to be used after being discharged. The recyclable nature of secondary batteries has made them gradually become the main source of power for electrical equipment. As the demand for secondary batteries gradually increases, people's requirements for their performance in all aspects are also getting higher and higher, especially the requirements for service life.

[0003] In the related art, a secondary battery is usually composed of an end cap assembly, an electrode assembly and a shell. The electrode assembly is located in the shell, the end cap assembly seals the opening of the shell, and the end cap assembly is connected to the electrode assembly through a current collector. During the assembly process of the secondary battery, after the electrode assembly is installed in the shell, there is a certain gap between the electrode assembly and the inner wall of the shell to ensure that the electrode assembly has enough expansion space after being soaked in the electrolyte. However, since the inner diameter of the electrode assembly is smaller than the inner diameter of the shell, when the electrode assembly is installed in the shell, there is a large coaxial deviation between the electrode assembly and the shell, which affects the subsequent assembly process and reduces the assembly yield. Summary of the invention

[0004] A main purpose of the present application is to provide an energy storage device and electrical equipment that can improve assembly yield.

[0005] In order to achieve the above application purpose, this application adopts the following technical solutions:

[0006] According to one aspect of the present application, there is provided an energy storage device, comprising:

[0007] The shell includes a housing cavity with a first opening; a first end cover assembly, sealing the first opening of the housing cavity; an electrode assembly, accommodated in the housing cavity; a first adapter, located between the electrode assembly and the first end cover assembly, and respectively connected to the electrode assembly and the first end cover assembly; a clamping member, sleeved on the end of the electrode assembly close to the first adapter, and at least part of the clamping member is located between the end face of the electrode assembly and the first adapter.

[0008] In the implementation mode of the present application, a clamping piece is sleeved on the end of the electrode assembly, and the clamping piece is limited after the first adapter is connected to the electrode assembly. In this way, when the electrode assembly is installed in the accommodating cavity of the shell, the clamping piece can be used to ensure the consistency of the gap between the electrode assembly and the inner wall of the shell, thereby reducing the coaxiality deviation between the electrode assembly and the shell while ensuring that the electrode assembly has sufficient expansion space after being immersed in the electrolyte, so as to ensure the assembly yield of the energy storage device.

[0009] According to one embodiment of the present application, the clamping member includes a crimping portion extending radially along the electrode assembly, and a supporting portion extending axially along the electrode assembly; the crimping portion is connected to the supporting portion, the crimping portion is located between the electrode assembly and the first adapter, and the supporting portion is located between the electrode assembly and the inner wall of the shell.

[0010] In the embodiment of the present application, the clamping member includes a connected crimping portion and a supporting portion, so as to simplify the structure of the clamping member, ensure the positioning of the clamping member on the electrode assembly, and ensure the coaxiality of the electrode assembly and the shell.

[0011] According to an embodiment of the present application, the second surface of the first adapter facing the electrode assembly has a recessed portion located at an edge, and the crimping portion is located in the recessed portion.

[0012] In the embodiment of the present application, by setting the recessed portion on the first adapter, the crimping portion of the clamping member can be prevented from interfering with the welding of the first adapter and the electrode assembly, so as to ensure the welding effect of the first adapter and the electrode assembly and avoid the occurrence of cold welding.

[0013] According to an embodiment of the present application, the first adapter is in a disc-shaped structure, the recessed portion has an abutment surface facing away from the center of the first adapter, and the crimping portion abuts against the abutment surface.

[0014] In the embodiment of the present application, when welding the first adapter and the electrode assembly, the first adapter can be positioned through the cooperation between the crimping portion and the abutment surface of the recessed portion to ensure the coaxiality of the first adapter and the electrode assembly, while ensuring the welding effect of the first adapter and the electrode assembly.

[0015] According to an embodiment of the present application, the support portion is an annular structure, and the clamping member includes a plurality of the crimping portions, which are connected to the support portion and are distributed at intervals along the circumference of the support portion.

[0016] According to one embodiment of the present application, the crimping portion is an annular structure, and the clamping member includes a plurality of the supporting portions, which are connected to the crimping portion and are spaced apart along the circumference of the crimping portion.

[0017] In the embodiment of the present application, by setting the crimping portion of the annular structure, it is convenient to increase the crimping area of ​​the first adapter to the clamping member, thereby ensuring the stability of the clamping member on the electrode assembly; in addition, by setting the multiple support portions at intervals, it is convenient to reduce the restriction on the electrode assembly due to expansion due to infiltration of electrolyte, thereby ensuring the wetting effect of the electrode assembly.

[0018] According to one embodiment of the present application, the crimping portion has a first edge portion away from the center of the electrode assembly, and the supporting portion has a second edge portion away from the first end cover assembly; the edge of the first edge portion facing the first end cover assembly and the edge of the second edge portion close to the electrode assembly are both chamfered.

[0019] In the embodiment of the present application, by setting the chamfer on the first edge portion of the crimping portion and the chamfer on the second edge portion of the supporting portion, it is convenient to realize assembly guidance when the electrode assembly is installed into the shell, thereby improving the efficiency of the electrode assembly entering the shell, and at the same time reducing the friction between the supporting portion of the clamp and the electrode assembly, thereby improving the assembly efficiency and assembly yield of the energy storage device.

[0020] According to one embodiment of the present application, the first end cap assembly includes a first cover plate, which seals the first opening of the accommodating cavity and has a through hole connected to the accommodating cavity; the first adapter has a first surface facing away from the electrode assembly and has a bulge, and the through hole is sleeved on the bulge.

[0021] In the embodiment of the present application, after the coaxiality of the electrode assembly and the shell is improved by the clamping member, the coaxiality of the first adapter and the shell is improved, and then when the convexity on the first adapter extends into the through hole on the first cover plate, the convexity on the first adapter and the first cover plate can be prevented from being misaligned and abutted, thereby improving the assembly efficiency of the first adapter and the first cover plate.

[0022] According to one embodiment of the present application, the bulge has a step surface facing the first cover plate, the first end cover assembly includes a first insulating member, and the first insulating member has an axial sealing portion and a radial sealing portion; the first insulating member is sleeved on the bulge, the axial sealing portion is located between the step surface and the first cover plate, and the radial sealing portion is located between the bulge and the hole wall of the through hole.

[0023] In the implementation manner of the present application, a first insulating member is provided between the step surface and the first cover plate to ensure the reliability of sealing after the first adapter and the first cover plate are assembled.

[0024] According to one embodiment of the present application, the energy storage device includes a second end cover assembly and a second adapter; the accommodating cavity of the shell has a second opening, the second end cover assembly seals the second opening, and the second adapter is located between the electrode assembly and the second end cover assembly, and is respectively connected to the electrode assembly and the second end cover assembly.

[0025] In the implementation mode of the present application, by setting the second opening on the shell, the connection between the first adapter and the electrode assembly and the sealing of the first end cover assembly to the first opening on the shell can be realized in advance, so as to realize the simultaneous assembly of multiple processes of the energy storage device; thereafter, when the electrode assembly is installed along the second opening on the shell, the coaxiality of the electrode assembly and the shell can be improved with the cooperation of the clamping member, and then the coaxiality of the first adapter and the first cover plate can be improved, so as to ensure the assembly efficiency of the first adapter and the first cover plate.

[0026] According to one embodiment of the present application, the second end cap assembly includes a second cover plate, a second insulating member and an electrode terminal; the second cover plate seals the second opening, the second insulating member is located between the second cover plate and the second adapter, and the electrode terminal is passed through the second cover plate and the second insulating member and is connected to the second adapter.

[0027] According to one aspect of the present application, an electric device is provided, the electric device comprising the energy storage device described in the above aspect, the energy storage device supplies power to the electric device.

[0028] 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

[0029] 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 attached drawings.

[0030] Figure 1 is a schematic structural diagram of a household energy storage system according to an exemplary embodiment.

[0031] Figure 2 is a schematic cross-sectional structure diagram of an energy storage device according to an exemplary embodiment.

[0032] Figure 3 is a schematic cross-sectional structure diagram of another energy storage device according to an exemplary embodiment.

[0033] Figure 4 is a schematic diagram of a partial explosion structure of an energy storage device according to an exemplary embodiment.

[0034] Figure 5 yes Figure 2 A locally enlarged structural schematic diagram of the energy storage device shown.

[0035] Figure 6 yes Figure 3 A locally enlarged structural schematic diagram of the energy storage device shown.

[0036] Figure 7 It is a schematic diagram of the axial structure of a clamping component according to an exemplary embodiment.

[0037] Figure 8 It is a schematic diagram of a side view structure of a clamping component according to an exemplary embodiment.

[0038] Fig. 9 yes Figure 8 A partial enlarged structural schematic diagram of the clamping component is shown.

[0039] Fig.10 The figure is a bottom view structural diagram showing an assembly of a clamping component and a first adapter component according to an exemplary embodiment.

[0040] Fig.11 It is a schematic structural diagram of an electric device according to an exemplary embodiment.

[0041] The reference numerals are described as follows:

[0042] 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment;

[0043] 10. Shell; 20. First end cap assembly; 30. Electrode assembly; 40. First adapter; 50. Card connector; 60. Second end cap assembly; 70. Second adapter;

[0044] 11. Accommodating cavity; 12. First opening; 13. Second opening;

[0045] 21. first cover plate; 22. through hole; 23. first insulating member; 24. axial sealing portion; 25. radial sealing portion;

[0046] 41. first surface; 42. convex hull; 43. step surface; 44. second surface; 45. concave portion; 46. abutting surface;

[0047] 51. crimping portion; 52. supporting portion; 53. first edge portion; 54. second edge portion;

[0048] 61. Second cover plate; 62. Second insulating member; 63. Electrode terminal. DETAILED DESCRIPTION

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of 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 comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0050] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve utilization, it is necessary to use a medium or device 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.

[0051] At present, green energy mainly includes solar energy, wind energy, etc., which generally have 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 abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0052] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0053] At present, 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:

[0054] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0055] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side, and small household energy storage boxes used in home energy storage scenarios on the user side, mainly operate in the "peak shaving and valley filling" mode. Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period; during the peak electricity price period, the electricity in the energy storage device is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas, as well as areas prone to 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.

[0056] Taking the household energy storage scenario in user-side energy storage as an example, Figure 1 The schematic diagram of an energy storage system provided by the embodiment of the present application is illustrated. Figure 1 As shown, the energy storage system includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, household appliances, etc.). The energy storage device 100 is a small energy storage box that can be mounted on an outdoor wall by wall-mounting. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy during the period of low electricity prices, and store it through the energy storage device 100, and then supply the user load 300 for use during the peak electricity price, or supply the user load 300 for use when the power grid is out of power / power outage.

[0057] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 100 includes at least one chemical battery, using the chemical elements in the chemical battery as the energy storage medium, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where the electric energy is scarce for use.

[0058] The embodiment of the present application provides an energy storage device 100, which may be, but is not limited to, a single cell (secondary battery), and a battery module, a battery pack, a battery system, etc. composed of single cells. For a single cell, it may be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The single cell may be cylindrical, flat, rectangular, etc., and the embodiment of the present application does not limit this.

[0059] Next, the energy storage device 100 is explained in detail by taking the energy storage device 100 as a square single battery as an example.

[0060] Figure 2 The schematic diagram of the structure of an energy storage device 100 provided in an embodiment of the present application is illustrated. Figure 3 The schematic diagram of the structure of an energy storage device 100 provided in the embodiment of the present application is illustrated. Figure 2 or Figure 3 As shown, the energy storage device 100 includes: a shell 10, a first end cover assembly 20, an electrode assembly 30 and a first adapter 40, the shell 10 includes a accommodating cavity 11 with a first opening 12, the first end cover assembly 20 seals the first opening 12 of the accommodating cavity 11, the electrode assembly 30 is accommodated in the accommodating cavity 11, the first adapter 40 is located between the electrode assembly 30 and the first end cover assembly 20, and respectively connects the electrode assembly 30 and the first end cover assembly 20.

[0061] Among them, Figure 2 or Figure 3 ,as well as Figure 4 As shown, the energy storage device 100 further includes a clamping member 50 , which is sleeved on the end of the electrode assembly 30 close to the first adapter 40 , and at least a portion of the clamping member 50 is located between the end surface of the electrode assembly 30 and the first adapter 40 .

[0062] In the embodiment of the present application, the clamping component 50 is sleeved on the end of the electrode assembly 30, and the clamping component 50 is limited after the first adapter 40 is connected to the electrode assembly 30. In this way, when the electrode assembly 30 is installed in the accommodating cavity 11 of the shell 10, the clamping component 50 can ensure the consistency of the gap between the electrode assembly 30 and the inner wall of the shell 10, thereby reducing the coaxiality deviation between the electrode assembly 30 and the shell 10 while ensuring that the electrode assembly 30 has sufficient expansion space after being immersed in the electrolyte, so as to ensure the assembly yield of the energy storage device 100.

[0063] Among them, the shell 10 can be a cylindrical structure with one end open, and the first opening 12 of the shell 10 can be directly sealed by the first end cover assembly 20; of course, the shell 10 can also be a cylindrical structure with both ends open, and the shell 10 also has a second opening 13 opposite to the first opening. The energy storage device 100 also includes a second end cover assembly 60, so as to seal the first opening 12 and the second opening 13 of the shell 10 respectively through the first end cover assembly 20 and the second end cover assembly 60.

[0064] Among them, the electrode assembly 30 includes a stacked positive electrode sheet, a negative electrode sheet and a separator, and the separator is located between the positive electrode sheet and the negative electrode sheet. The edges of the positive electrode sheet and the negative electrode sheet have pole ears to form the positive pole ear and the negative pole ear of the electrode assembly 30. The positive pole ear and the negative pole ear can be located at the same end of the electrode assembly 30 in the axial direction, or at different ends of the electrode assembly 30 in the axial direction.

[0065] In the embodiments of the present disclosure, Figure 2 and Figure 5 As shown, the first end cover assembly 20 includes a first cover plate 21, and the first cover plate 21 seals the first opening 12 of the accommodating cavity 11. As for the connection between the first adapter 40 and the first end cover assembly 20, the first adapter 40 and the first cover plate 21 can be connected by penetration welding; or Figure 5 As shown, the first cover plate 21 has a through hole 22 connected to the accommodating cavity 11 , and the first surface 41 of the first adapter 40 facing away from the electrode assembly 30 has a convex bump 42 , and the through hole 22 on the first cover plate 21 is sleeved on the convex bump 42 .

[0066] In combination with the above, after the coaxiality between the electrode assembly 30 and the shell 10 is improved by the clamping member 50, the coaxiality between the first adapter 40 and the shell 10 can be improved, so as to facilitate the improvement of the alignment accuracy between the first adapter 40 and the first cover plate 21. In this way, when the first adapter 40 and the first cover plate 21 are subjected to penetration welding, the effectiveness of the welding between the first adapter 40 and the first cover plate 21 is improved, and the situation of cold welding is avoided, thereby improving the assembly yield of the energy storage device 100; or when the convex bump 42 on the first adapter 40 extends into the through hole 22 on the first cover plate 21, it is convenient to improve the assembly efficiency of the first adapter 40 and the first cover plate 21, and the situation of misalignment and abutment between the convex bump 42 on the first adapter 40 and the first cover plate 21 is avoided, thereby improving the assembly efficiency of the energy storage device 100.

[0067] Among them, the first cover plate 21 and the first adapter 40 are connected by penetration welding, which can realize the fixed connection between the first adapter 40 and the first cover plate 21, and at the same time realize the electrical conduction between the first adapter 40 and the first cover plate 21, so that the first cover plate 21 can be used as an electrode output end of the energy storage device 100.

[0068] Among them, the first cover plate 21 has a through hole 22, and the through hole 22 is sleeved on the convex 42 of the first adapter 40. The convex 42 of the first adapter 40 and the edge of the through hole 22 on the first cover plate 21 can be fixedly connected by gap welding, and the electrical conduction between the first adapter 40 and the first cover plate 21 is achieved, so that the convex 42 on the first cover plate 21 or the first adapter 40 is used as an electrode output end of the energy storage device 100; or the first adapter 40 and the first cover plate 21 are insulated, and the convex 42 on the first adapter 40 passes through the through hole 22 on the first cover plate 21 and is fixed to the first cover plate 21 by a rivet, so that after the insulation fixation of the first adapter 40 and the first cover plate 21 is achieved, the convex 42 on the first adapter 40 is used as an electrode output end of the energy storage device 100.

[0069] In some embodiments, the insulation arrangement between the first adapter 40 and the first cover plate 21 may be as follows: Figure 3 and Figure 6 As shown, the convex hump 42 has a step surface 43 facing the first cover plate 21, the first end cover assembly 20 includes a first insulating member 23, and the first insulating member 23 has an axial sealing portion 24 and a radial sealing portion 25. The first insulating member 23 is sleeved on the convex hump 42 of the first adapter 40, the axial sealing portion 24 of the first insulating member 23 is located between the step surface 43 of the convex hump 42 and the first cover plate 21, and the radial sealing portion 25 is located between the convex hump 42 and the hole wall of the through hole 22. In this way, the reliability of the seal between the first adapter 40 and the first cover plate 21 can be achieved through the axial sealing portion 24 and the radial sealing portion 25 included in the first insulating member 23, while ensuring effective insulation, thereby preventing the first cover plate 21 from being charged.

[0070] Optionally, the axial sealing portion 24 included in the first insulating member 23 can be an annular sealing structure, the radial sealing portion 25 can be a cylindrical sealing structure, and the axial sealing portion 24 and the radial sealing portion 25 are an integrated structure to simplify the component structure of the first end cover assembly 20, simplify the assembly process of the energy storage device 100, and improve assembly efficiency.

[0071] In some embodiments, Figure 2 or Figure 3 As shown, the energy storage device 100 includes a second end cover assembly 60 and a second adapter 70; the accommodating cavity 11 of the shell 10 has a second opening 13 (that is, the shell 10 is a cylindrical structure with openings at both ends), the second end cover assembly 60 seals the second opening 13, and the second adapter 70 is located between the electrode assembly 30 and the second end cover assembly 60, and is respectively connected to the electrode assembly 30 (the other pole ear of the electrode assembly 30) and the second end cover assembly 60.

[0072] In this way, by setting the second opening 13 on the shell 10, the connection between the first adapter 40 and the electrode assembly 30 and the sealing of the first end cover assembly 20 to the first opening 12 on the shell 10 can be realized in advance, and then the electrode assembly 30 can be installed along the second opening 13 on the shell 10, so as to improve the coaxiality of the electrode assembly 30 and the shell 10 with the cooperation of the clamping member 50, and then improve the coaxiality of the first adapter 40 and the first cover plate 21, thereby ensuring the assembly efficiency of the first adapter 40 and the first cover plate 21.

[0073] The connection between the second adapter 70 and the second end cover assembly 60 can be as follows: Figure 3As shown, the second end cover assembly 60 includes a second cover plate 61, which seals the second opening 13 of the housing 10 and is connected to the second adapter 70. The connection between the second cover plate 61 and the second adapter 70 can refer to the connection between the first cover plate 21 and the first adapter 40 described in the above embodiment.

[0074] Or Figure 2 As shown, the second end cover assembly 60 includes a second cover plate 61, a second insulating member 62 and an electrode terminal 63; the second cover plate 61 seals the second opening 13, the second insulating member 62 is located between the second cover plate 61 and the second adapter 70, and the electrode terminal 63 is passed through the second cover plate 61 and the second insulating member 62, and is connected to the second adapter 70.

[0075] Among them, a third insulating member is arranged between the electrode terminal 63 and the second cover plate 61 to achieve insulation between the electrode terminal 63 and the second cover plate 61. For the connection between the electrode terminal 63 and the second adapter 70 included in the second end cover assembly 60, please refer to the relevant technology for details.

[0076] It should be noted that, in the case where the energy storage device 100 includes the second end cap assembly 60 and the second adapter 70, the end of the electrode assembly 30 facing the second adapter 70 may also be sleeved with the above-mentioned clamping member 50, and the second adapter 70 is crimped on the clamping member 50 after being connected to the electrode assembly 30, so as to achieve the fixation of the clamping member 50 at the end of the electrode assembly 30. In this way, after the electrode assembly 30 is installed in the shell 10, based on the proximity of the clamps sleeved at both ends of the electrode assembly 30, the coaxiality of the electrode assembly 30 and the shell 10 can be further ensured, thereby improving the assembly yield of the energy storage device 100. In addition, in the embodiment of the present application, the energy storage device 100 includes a first cover plate 21, or includes a second cover plate 61. The first cover plate 21 or the second cover plate 61 may be provided with an injection hole and / or an explosion-proof valve, so that after the energy storage device 100 is assembled, the electrolyte can be injected into the accommodating cavity 11 of the shell 10 through the injection hole, and during the charging and discharging process of the energy storage device 100, the gas generated by the electrode assembly 30 is discharged based on the explosion-proof valve, thereby reducing the risk of explosion of the energy storage device 100.

[0077] In the embodiment of the present disclosure, in combination with the case where the energy storage device 100 described above only includes the first end cover assembly 20, for example 1, the shell 10 is a cylindrical structure with one end open, that is, the accommodating cavity 11 of the shell 10 has only the first opening 12, the first cover plate 21 seals the first opening 12 of the accommodating cavity 11, and has a through hole 22, the first adapter 40 has a convex bulge 42, the convex bulge 42 is sleeved with a first insulating member 23, the convex bulge 42 passes through the through hole 22, and is fixed by a rivet to achieve insulation between the first adapter 40 and the first cover plate 21, at this time, the convex bulge 42 serves as an electrode output end of the energy storage device 100; the end of the electrode assembly 30 away from the first end cover assembly 20 is connected to the bottom of the shell 10, at this time, the bottom arm of the shell 10 serves as another electrode output end of the energy storage device 100.

[0078] In combination with the above-mentioned case where the energy storage device 100 includes both the first end cover assembly 20 and the second end cover assembly 60, Example 2, the first end cover assembly 20 includes a first cover plate 21, and the first adapter 40 is fixedly connected to the first cover plate 21 by penetration welding. At this time, the first cover plate 21 serves as an electrode output end of the energy storage device 100; the second end cover assembly 60 includes a second cover plate 61, a second insulating member 62 and an electrode terminal 63, the electrode terminal 63 is insulated from the second cover plate 61, and is connected to the second adapter 70. At this time, the electrode terminal 63 included in the second end cover assembly 60 serves as another electrode output end of the energy storage device 100.

[0079] Example 3, such as Figure 2 and Figure 5 As shown, the first cover plate 21 has a through hole 22, the first adapter 40 has a convex bump 42, the through hole 22 is sleeved on the convex bump 42, and the convex bump 42 is fixedly connected to the first cover plate 21 by gap welding. At this time, the convex bump 42 is connected to the first cover plate 21 to serve as an electrode output end of the energy storage device 100; the second end cover assembly 60 includes a second cover plate 61, a second insulating member 62 and an electrode terminal 63, the electrode terminal 63 is insulated from the second cover plate 61 and connected to the second adapter 70, and at this time, the electrode terminal 63 included in the second end cover assembly 60 serves as another electrode output end of the energy storage device 100.

[0080] Example 4, such as Figure 3 and Figure 6As shown, the first cover plate 21 seals the first opening 12 of the accommodating cavity 11 and has a through hole 22. The first adapter 40 has a convex 42, on which the first insulating member 23 is sleeved. The convex 42 passes through the through hole 22 and is fixed by a rivet to achieve insulation between the first adapter 40 and the first cover plate 21. At this time, the convex 42 serves as an electrode output end of the energy storage device 100. The second end cover assembly 60 includes a second cover plate 61, which is connected to the second adapter 70. At this time, the second cover plate 61 serves as another electrode output end of the energy storage device 100.

[0081] In some embodiments, Figure 4 As shown, the clamping member 50 has a crimping portion 51 extending along the radial direction of the electrode assembly 30, and a supporting portion 52 extending along the axial direction of the electrode assembly 30, the crimping portion 51 is connected to the supporting portion 52, the crimping portion 51 is located between the electrode assembly 30 and the first adapter 40, and the supporting portion 52 is located between the electrode assembly 30 and the inner wall of the shell 10. In this way, the clamping member 50 is provided to include the connected crimping portion 51 and the supporting portion 52, so as to ensure the limiting of the clamping member 50 on the electrode assembly 30 on the basis of simplifying the structure of the clamping member 50, and at the same time ensure the coaxiality of the electrode assembly 30 and the shell 10.

[0082] The crimping portion 51 and the supporting portion 52 may be directly connected or indirectly connected, that is, the clamping member 50 includes not only the crimping portion 51 and the supporting portion 52 but also a connecting member, and the crimping portion 51 and the supporting portion 52 are both connected to the connecting member.

[0083] In some embodiments, Figure 4 or Figure 7 As shown, the support portion 52 is annular in structure, and the clamping member 50 includes a plurality of crimping portions 51 . The plurality of crimping portions 51 are connected to the support portion 52 and are distributed at intervals along the circumference of the support portion 52 .

[0084] In this way, by providing the support portion 52 of the annular structure, it is convenient to limit the electrode assembly 30 in the entire circumferential direction of the electrode assembly 30 , so as to effectively ensure the coaxiality between the electrode assembly 30 and the shell 10 .

[0085] For example, Figure 7 As shown, the clamping member 50 includes three crimping portions 51 evenly distributed along the circumference of the supporting portion 52 .

[0086] In other embodiments, the crimping portion 51 is annular in structure, and the clamping member 50 includes a plurality of supporting portions 52 , which are connected to the crimping portion 51 and are spaced apart along the circumference of the crimping portion 51 .

[0087] In this way, by setting the crimping portion 51 of the annular structure, it is convenient to increase the crimping area of ​​the first adapter 40 on the clamping component 50, thereby ensuring the stability of the clamping component 50 when it is sleeved on the electrode assembly 30; in addition, by setting the multiple support portions 52 at intervals, it is convenient to reduce the restriction on the electrode assembly 30 due to expansion due to infiltration of electrolyte, thereby ensuring the wetting effect of the electrode assembly 30.

[0088] It should be noted that the clamping member 50 in the embodiment of the present application may be of other structures besides the above two structures. For example, the clamping member 50 includes an annular portion, and a supporting portion 52 and a crimping portion 51 fixed on the annular portion.

[0089] In some embodiments, Figure 8 and Fig. 9 As shown, the crimping portion 51 has a first edge portion 53 away from the center of the electrode assembly 30, and the edge of the first edge portion 53 facing the first end cap assembly 20 is provided with a chamfer (such as a circular chamfer or a straight chamfer). In this way, by providing the chamfer on the first edge portion 53 of the crimping portion 51, it is convenient to guide the assembly when the electrode assembly 30 is installed into the shell 10, thereby improving the efficiency of the electrode assembly 30 being installed into the shell.

[0090] In some embodiments, Figure 8 and Fig. 9 As shown, the support portion 52 has a second edge portion 54 away from the first end cap assembly 20, and the edge of the second edge portion 54 close to the electrode assembly 30 is provided with a chamfer (such as a circular chamfer or a straight chamfer). In this way, by providing the chamfer on the second edge portion 54 of the support portion 52, it is convenient for the clamping member 50 to be sleeved on the end of the electrode assembly 30, and the friction between the support portion 52 of the clamping member 50 and the electrode assembly 30 can be reduced, thereby improving the assembly efficiency and assembly yield of the energy storage device 100.

[0091] In some embodiments, Fig.10 As shown, the second surface 44 of the first adapter 40 facing the electrode assembly 30 has a recessed portion 45 at the edge, and the crimping portion 51 on the clamping member 50 is located in the recessed portion 45. In this way, by setting the recessed portion 45 on the first adapter 40, the crimping portion 51 of the clamping member 50 can be prevented from interfering with the welding of the first adapter 40 and the electrode assembly 30, so as to ensure the welding effect of the first adapter 40 and the electrode assembly 30 and avoid the occurrence of cold welding.

[0092] Alternatively, if Fig.10As shown, the first adapter 40 is a disc-shaped structure, the recessed portion 45 has an abutting surface 46 facing away from the center of the first adapter 40, and the crimping portion 51 abuts against the abutting surface 46 of the recessed portion 45. In this way, when welding the first adapter 40 and the electrode assembly 30, the first adapter 40 can be positioned through the cooperation between the crimping portion 51 and the abutting surface 46 of the recessed portion 45, ensuring the coaxiality of the first adapter 40 and the electrode assembly 30, while ensuring the welding effect of the first adapter 40 and the electrode assembly 30.

[0093] The present application also provides an electric device 400, which may be a user energy storage cabinet, etc. Fig.11 As shown, the electric device 400 includes the energy storage device 100 described in the above embodiment, and the energy storage device 100 supplies power to the electric device 400. Thus, in combination with the above, in the present application, a clamping member 50 is provided at the end of the electrode assembly 30 to improve the assembly yield of the energy storage device 100, so as to facilitate the stability of power supply when the energy storage device 100 is used to supply power to the electric device 400.

[0094] 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.

[0095] In the description of the implementation methods of the present application, it needs to be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the implementation methods 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, cannot be understood as a limitation on the implementation methods of the present application.

[0096] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the implementation of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0097] The above are only preferred embodiments of the implementation methods of the present application, and are not intended to limit the implementation methods of the present application. For those skilled in the art, the implementation methods of the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the implementation methods of the present application shall be included in the protection scope of the implementation methods of the present application.

Claims

1. An energy storage device (100), characterized in that: include: A housing (10) comprising a receiving chamber (11) having a first opening (12); A first end cover assembly (20) for sealing a first opening (12) of the accommodating cavity (11); An electrode assembly (30) is accommodated in the accommodation cavity (11); a first adapter (40), located between the electrode assembly (30) and the first end cover assembly (20), and connected to the electrode assembly (30) and the first end cover assembly (20) respectively; The clamping component (50) is sleeved on the end of the electrode assembly (30) close to the first adapter (40), and at least a portion of the clamping component (50) is located between the end surface of the electrode assembly (30) and the first adapter (40).

2. The energy storage device according to claim 1, characterized in that The clamping member (50) comprises a crimping portion (51) extending in the radial direction of the electrode assembly (30), and a supporting portion (52) extending in the axial direction of the electrode assembly (30); The crimping portion (51) is connected to the supporting portion (52); the crimping portion (51) is located between the electrode assembly (30) and the first adapter (40); and the supporting portion (52) is located between the electrode assembly (30) and the inner wall of the shell (10).

3. The energy storage device (100) according to claim 2, characterized in that: The second surface (44) of the first adapter (40) facing the electrode assembly (30) has a recessed portion (45) located at the edge, and the crimping portion (51) is located in the recessed portion (45).

4. The energy storage device (100) according to claim 3, characterized in that: The first adapter (40) is in a disc-shaped structure, the recessed portion (45) has an abutment surface (46) facing away from the center of the first adapter (40), and the crimping portion (51) abuts against the abutment surface (46).

5. The energy storage device (100) according to claim 2, characterized in that: The support portion (52) is an annular structure, and the clamping member (50) comprises a plurality of crimping portions (51), wherein the plurality of crimping portions (51) are connected to the support portion (52) and are distributed at intervals along the circumference of the support portion (52).

6. The energy storage device (100) according to claim 2, characterized in that: The crimping portion (51) is an annular structure, and the clamping member (50) comprises a plurality of supporting portions (52), wherein the plurality of supporting portions (52) are connected to the crimping portion (51) and are distributed at intervals along the circumference of the crimping portion (51).

7. The energy storage device (100) according to claim 2, characterized in that: The crimping portion (51) has a first edge portion (53) away from the center of the electrode assembly (30), and the supporting portion (52) has a second edge portion (54) away from the first end cap assembly (20); The edge of the first edge portion (53) facing the first end cover assembly (20) and the edge of the second edge portion (54) close to the electrode assembly (30) are both provided with chamfers.

8. The energy storage device (100) according to any one of claims 1 to 7, characterized in that: The first end cover assembly (20) comprises a first cover plate (21), the first cover plate (21) seals the first opening (12) of the accommodating cavity (11) and has a through hole (22) communicating with the accommodating cavity (11); The first surface (41) of the first adapter (40) facing away from the electrode assembly (30) has a convex bump (42), and the through hole (22) is sleeved on the convex bump (42).

9. The energy storage device (100) according to claim 8, characterized in that: The convex bump (42) has a stepped surface (43) facing the first cover plate (21); the first end cover assembly (20) comprises a first insulating member (23), and the first insulating member (23) has an axial sealing portion (24) and a radial sealing portion (25); The first insulating member (23) is sleeved on the convex hump (42), the axial sealing portion (24) is located between the step surface (43) and the first cover plate (21), and the radial sealing portion (25) is located between the convex hump (42) and the hole wall of the through hole (22).

10. The energy storage device (100) according to any one of claims 1 to 7, characterized in that: The energy storage device (100) comprises a second end cover assembly (60) and a second adapter (70); The accommodating cavity (11) of the shell (10) has a second opening (13), the second end cover assembly (60) seals the second opening (13), and the second adapter (70) is located between the electrode assembly (30) and the second end cover assembly (60), and is respectively connected to the electrode assembly (30) and the second end cover assembly (60).

11. The energy storage device (100) according to claim 10, characterized in that: The second end cap assembly (60) comprises a second cap plate (61), a second insulating member (62) and an electrode terminal (63); The second cover plate (61) seals the second opening (13); the second insulating member (62) is located between the second cover plate (61) and the second adapter (70); the electrode terminal (63) is passed through the second cover plate (61) and the second insulating member (62), and is connected to the second adapter (70).

12. An electrical device (400), characterized in that: The electrical device (400) comprises the energy storage device (100) described in 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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