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 which comprises a containing cavity with an opening, and a mounting hole is formed in a bottom plate of the shell; the electrode assembly is contained in the containing cavity, the first end of the electrode assembly faces the bottom of the shell, and the second end of the electrode assembly is located on the opening side of the containing cavity; the pole assembly comprises a first switching piece and an electrode pole, the first switching piece is of a Z-shaped bent structure and is electrically connected with the first end of the electrode assembly, and the electrode pole is fixedly connected with the first switching piece, penetrates through the mounting hole and is riveted and limited on the bottom plate; and the end cover assembly seals the opening of the accommodating cavity and is connected with the second end part of the electrode assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to an energy storage device and an electric equipment. BACKGROUND

[0002] A secondary battery, also known as a rechargeable battery or a storage battery, is a battery that can be activated by charging after discharging to continue to be used. The recyclable nature of the secondary battery makes it gradually become the main power source of electric equipment. As the demand for secondary batteries gradually increases, people's requirements for its performance in all aspects are also getting higher and higher, especially for the service life.

[0003] In related technologies, a secondary battery is usually composed of a shell, an electrode assembly, an end cover assembly and a pole. The actual production process is to manufacture an end cover unit, an electrode assembly and a shell respectively, then to weld an electrode terminal of the end cover assembly and one tab of the electrode assembly, and to weld an electrode pole of the pole assembly and another tab of the electrode assembly, then to put the electrode assembly into the shell, and then to weld and seal the opening of the shell with the end cover unit to form the basic structure of the secondary battery.

[0004] Among them, the electrode pole assembly includes an electrode pole arranged on the bottom plate of the shell, and is insulated from the bottom plate by including an upper plastic and a lower plastic. In this way, although the safety performance of the energy storage device is ensured, the structure complexity of the pole assembly is undoubtedly increased. Content of the utility model

[0005] One of the main purposes of the present application is to provide an energy storage device and an electric equipment capable of simplifying the structure of the pole assembly.

[0006] To achieve the above-mentioned application purposes, the present application adopts the following technical solutions:

[0007] According to one aspect of the present application, an energy storage device is provided, comprising: a shell including a containing cavity with an opening, and a bottom plate of the shell having a mounting hole; an electrode assembly contained in the containing cavity, and a first end portion of the electrode assembly facing the bottom of the shell, and a second end portion of the electrode assembly located on the opening side of the containing cavity; a pole assembly including a first adapter plate and an electrode pole, the first adapter plate being a Z-shaped bending structure and being electrically connected with the first end portion of the electrode assembly, and the electrode pole being fixedly connected with the first adapter plate and penetrating through the mounting hole and being riveted and limited on the bottom plate; and an end cover assembly sealing the opening of the containing cavity and being connected with the second end portion of the electrode assembly.

[0008] In the embodiment of the present application, the structure of the pole assembly is simplified based on the direct connection between the electrode post and the bottom plate, thereby facilitating the assembly efficiency of the pole assembly and the energy storage device. In addition, the structure of the pole assembly is simplified, thereby facilitating the space utilization of the accommodating cavity of the shell, and realizing the miniaturization design of the energy storage device or the large capacity setting of the energy storage device.

[0009] According to an embodiment of the present application, a surface of the bottom plate facing away from the accommodating cavity has a first groove surrounding the mounting hole, and an end side wall of the electrode post has a protruding limiting platform, which is limited in the first groove.

[0010] In the embodiment of the present application, the limiting of the second end of the electrode post in the first groove is realized by the limiting of the limiting platform in the first groove, thereby realizing the riveting assembly of the pole assembly on the bottom plate.

[0011] According to an embodiment of the present application, the limiting platform is annular.

[0012] In the embodiment of the present application, the annular limiting platform facilitates the increase of the limiting area in the first groove, thereby ensuring the stability of the limiting of the second end of the electrode post in the first groove.

[0013] According to an embodiment of the present application, a thickness of the limiting platform in the axial direction of the energy storage device is less than a depth of the first groove, and an edge of the limiting platform is welded and fixed with a groove wall of the first groove.

[0014] In the embodiment of the present application, the welding of the limiting platform and the groove wall of the first groove not only improves the stability of the limiting of the limiting platform in the first groove, but also realizes the sealing of the gap between the limiting platform and the first groove, thereby ensuring the reliability of the assembly of the pole assembly.

[0015] According to an embodiment of the present application, the pole assembly further comprises a sealing ring, which is sleeved on the electrode post and clamped between the bottom plate and the first adapter piece.

[0016] According to an embodiment of the present application, a surface of the bottom plate facing the accommodating cavity has a second groove surrounding the mounting hole, and at least part of the sealing ring is limited in the second groove.

[0017] In the embodiment of the present application, the limiting of the sealing ring is realized by the setting of the second groove, thereby ensuring the reliability of the assembly of the sealing ring, and further ensuring the reliability of the sealing between the electrode post and the hole wall of the mounting hole.

[0018] According to an embodiment of the present application, the first adapter plate has a through hole, the electrode post comprises a base and a post connected to the base, the post passes through the through hole and is riveted to the bottom plate, and the first adapter plate is fixedly connected to the base.

[0019] In the embodiment of the present application, the sealing ring 45 is clamped between the first adapter plate 41 and the bottom plate 13, the contact area between the post assembly and the bottom plate is effectively increased on the basis of the connection between the first adapter plate and the electrode assembly, the current carrying capacity of the post assembly is increased, and high rate charge and discharge of the energy storage device is realized.

[0020] According to an embodiment of the present application, the end surface of the electrode post abuts against the surface of the first adapter plate and is welded.

[0021] In the embodiment of the present application, the sealing ring is clamped between the first adapter plate and the bottom plate, the structure of the first adapter plate and the electrode post is simplified, the manufacturing efficiency of the first adapter plate and the electrode post is improved, and the electrode post and the first adapter plate are directly welded after abutting against each other, thereby improving the assembly efficiency of the post assembly.

[0022] According to an embodiment of the present application, the end cover assembly comprises a cover plate, a second adapter plate and an electrode terminal, the electrode terminal passes through the cover plate and is insulated from the cover plate, the second adapter plate is electrically connected to the electrode terminal, the cover plate seals the opening of the accommodating cavity, and the second adapter plate is electrically connected to the second end of the electrode assembly.

[0023] According to an aspect of the present application, a power utilization device is provided, which comprises the energy storage device according to the above aspect, and the energy storage device supplies power to the power utilization device.

[0024] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

[0026] Figure 1 is a schematic view of an energy storage system according to an exemplary embodiment.

[0027] Figure 2 is a top view structural schematic view of an energy storage device according to an exemplary embodiment.

[0028] Figure 3 is Figure 2A cross-sectional structure schematic view of one energy storage device along the cross-sectional line A-A' is shown.

[0029] Figure 4 A cross-sectional structure schematic view of another energy storage device along the cross-sectional line A-A' is shown. Figure 2

[0030] Figure 5 A partial enlarged structure schematic view of one energy storage device is shown. Figure 4

[0031] Figure 6 A cross-sectional structure schematic view of another energy storage device along the cross-sectional line A-A' is shown. Figure 2

[0032] Figure 7 A partial enlarged structure schematic view of one energy storage device is shown. Figure 6

[0033] Figure 8 A structure schematic view of one electrical equipment is shown.

[0034] Figure 9 A structure schematic view of another electrical equipment is shown.

[0035] Figure 10 A cross-sectional structure schematic view of another energy storage device along the cross-sectional line A-A' is shown. Figure 2

[0036] Figure 11 A partial enlarged structure schematic view of one energy storage device is shown. Figure 10

[0037] Figure 12 A structure schematic view of one electrical equipment is shown.

[0038] In the drawings, reference numerals are generally used to refer to the same or similar elements throughout the drawings.

[0039] 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment;

[0040] 10, housing; 20, electrode assembly; 30, end cover assembly; 40, pole assembly;

[0041] 11, accommodating cavity; 12, wall plate; 13, bottom plate;

[0042] 131, mounting hole; 132, first sink groove; 133, second sink groove; ​​​​​​

[0043] 31, cover plate; 32, electrode terminal; 33, second adapter piece; 34, explosion-proof valve; 35, liquid injection hole; 36, sealing plug;

[0044] 41, first adapter piece; 42, electrode post; 43, lower plastic; 44, upper plastic; 45, sealing ring; 46, riveting pressing block;

[0045] 411, through hole; 421, column body; 422, limiting table; 423, seat body. DETAILED DESCRIPTION

[0046] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any number of ways, and example implementations should not be construed as limited to what is presented herein; rather, examples are presented as a representative disclosure to convey the substance of example implementations to others skilled in the art. Like reference numerals refer to like elements throughout the description of the figures.

[0047] Since the energy required by people has strong time and space, in order to reasonably use energy and improve utilization, it is necessary to store one form of energy into the same form of energy or another form of energy through a medium or device, and then release it in a specific energy form based on future application.

[0048] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage instability of green power grid (not enough electricity at peak electricity consumption, and too much electricity at low electricity consumption), and unstable voltage will cause damage to electricity, therefore, it may cause the problem of "abandoning wind and light" due to insufficient electricity demand or insufficient grid receiving capacity.

[0049] In order to solve the problem of insufficient electricity demand or insufficient grid receiving capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electric energy is converted into other forms of energy by physical or chemical means for storage, and when needed, the energy stored in the energy storage device is converted into electric energy for release. In simple terms, the energy storage device is similar to a large "power bank", which stores electric energy when light energy and wind energy are sufficient, and releases the stored electric energy when needed.

[0050] The current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0051] (1) Large energy storage container applied in grid-side energy storage scenario, which can be used as high-quality active and reactive power regulation power supply in the power grid, realizes load matching of electric energy in time and space, enhances renewable energy consumption capacity, and is of great significance in terms of power grid system backup, relieving peak load power supply pressure and peak regulation;

[0052] (2) Small and medium-sized energy storage cabinet applied in industrial and commercial energy storage scenario (bank, shopping mall, etc.) at user side and household small energy storage box applied in household energy storage scenario at user side, the main operation mode of which is "peak clipping and valley filling". Since there is a large price difference in electricity charges at peak and valley positions according to electricity demand, after users have energy storage equipment, in order to reduce costs, the energy storage device (energy storage cabinet / box) is usually charged at the low valley period of electricity price; at the high peak period of electricity price, the electricity in the energy storage device is discharged for use, so as to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to providing backup power for users and the power grid, which eliminates the inconvenience caused by frequent power outages due to disasters or other reasons.

[0053] The embodiment of the present application provides an energy storage system, which comprises an energy storage device to realize storage or supply of electric energy by the energy storage device.

[0054] Taking the household energy storage scenario in user-side energy storage as an example, Figure 1 A schematic diagram of an energy storage system provided by the embodiment of the present application is shown, which comprises 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, a household appliance, etc.), the electric energy conversion device 200 is electrically connected with the energy storage device 100, and the energy storage device 100 is electrically connected with the user load 300, the energy storage device 100 is a small energy storage box, which can be installed on an outdoor wall in a wall-mounted manner. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy, which is stored by the energy storage device 100, and then supplied to the user load 300 for use at the high peak period of electricity price, or supplied to the user load 300 for use when the power grid is powered off.

[0055] The energy storage device 100 can be, but is not limited to, a single battery (secondary battery), and a battery module, a battery pack, a battery system, etc. composed of single batteries. The battery single 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 can be in the shape of a cylinder, a flat body, a cuboid, etc. The present application does not limit the battery single. Specifically, the battery single can realize the charging and discharging process by using the chemical reaction or change of the energy storage medium (chemical element). In short, the electrical energy generated by light energy and wind energy is stored in the battery single through the chemical reaction or change of the energy storage medium, and when the use of external electrical energy reaches a peak, the electrical energy stored in the battery single is released and used through the chemical reaction or change of the energy storage medium, or is transferred and used.

[0056] In some embodiments, as shown in Figure 2 and Figure 3 The energy storage device 100 includes a housing 10, an electrode assembly 20, a pole assembly 40, and an end cover assembly 30. The housing 10 includes a receiving cavity 11 with an opening. The electrode assembly 20 is received in the receiving cavity 11, and a first end of the electrode assembly 20 faces the bottom of the housing 10, and a second end of the electrode assembly 20 is located at the opening side of the receiving cavity 11. The pole assembly 40 is electrically connected to the first end of the electrode assembly 20 and to the bottom plate 13 of the housing 10. The end cover assembly 30 seals the opening of the receiving cavity 11 and is connected to the second end of the electrode assembly 20.

[0057] As shown in Figure 3 , the housing 10 can be a cylindrical structure with one end open, and the housing 10 includes an annular wall plate 12 and a bottom plate 13, and the bottom plate 13 is located at one open side of the wall plate 12. The bottom plate 13 and the wall plate 12 can be integrally formed, or can be fixedly connected by welding to realize the manufacture of the housing 10. In addition, the bottom plate 13 can be provided with an explosion-proof valve 34, which is used to burst when the pressure in the receiving cavity 11 of the housing 10 is greater than the opening valve pressure, and to exhaust the gas in the receiving cavity to improve the safety of the energy storage device 100.

[0058] As shown in Figure 3 , the end cover assembly 30 includes a cover plate 31 and an electrode terminal 32. The cover plate 31 seals the opening of the receiving cavity 11, and the electrode terminal 32 is provided through the cover plate 31 and is insulated between the cover plate 31. One end of the electrode terminal 32 is connected to the second end of the electrode assembly 20, and the other end is exposed outside the cover plate 31 to serve as an output terminal of the energy storage device 100. The insulation between the electrode terminal 32 and the cover plate 31 can refer to related technologies, and the present application does not limit it.

[0059] In addition, as shown in Figure 3As shown, the cover plate 31 can be provided with an explosion-proof valve 34, which is used to burst open when the pressure in the accommodating cavity 11 of the shell 10 is greater than the valve opening pressure, and to exhaust the gas in the accommodating cavity, so as to improve the safety of the energy storage device 100 in use. Figure 3 As shown, the cover plate 31 can also be provided with a liquid injection hole 35 and a sealing plug 36 sealing the liquid injection hole 35, so that after the assembly of the energy storage device 100 is completed, the electrolyte for infiltrating the electrode assembly 20 is injected along the liquid injection hole 35.

[0060] Optionally, as shown, Figure 3 The end cover assembly 30 further includes a second adapter plate 33 between the electrode terminal 32 and the electrode assembly 20, the second adapter plate 33 is connected with the second end of the electrode assembly 20 and the electrode terminal 32. In this way, the second adapter plate 33 realizes the connection between the electrode assembly 20 and the electrode terminal 32, thereby improving the current carrying capacity between the electrode assembly 20 and the electrode terminal 32, so as to realize the high rate charge and discharge of the energy storage device 100.

[0061] The electrode assembly 20 includes a first pole piece, a second pole piece and a diaphragm arranged in layers, the first pole piece and the second pole piece have opposite polarities, and the diaphragm is located between the first pole piece and the second pole piece. The first pole piece, the second pole piece and the diaphragm are stacked to form the electrode assembly 20 by winding, and a first lug integrated with the first pole piece and a second lug integrated with the second pole piece are formed at the first end and the second end of the electrode assembly 20, respectively. At this time, one of the first lug and the second lug is connected with the electrode terminal 32 included in the end cover assembly 30, and the other is connected with the pole assembly 40, so as to realize the output of the electric energy of the electrode assembly 20 through the electrode terminal 32 included in the end cover assembly 30 and the bottom plate 13 included in the shell 10.

[0062] In the related art, as shown, Figure 3 The pole assembly 40 includes a first adapter plate 41, an electrode column 42, a lower plastic 43, an upper plastic 44 and a riveting block 46. The bottom plate 13 of the shell 10 has a mounting hole 131. One end of the electrode column 42 is electrically connected with the first adapter plate 41, so as to be limited on the side of the bottom plate 13 close to the electrode assembly 20. The other end of the electrode column 42 passes through the lower plastic 43, the mounting hole 131 and the upper plastic 44 in sequence, and is connected with the riveting block 46, so as to be limited on the side of the bottom plate 13 away from the electrode assembly 20. Meanwhile, the upper plastic 44 and the lower plastic 43 are provided to realize the insulation between the electrode column 42 and the bottom plate 13.

[0063] The first adapter plate 41 is fixedly connected with the first end of the electrode assembly 20, that is, fixedly connected (such as welded) with the first lug of the first end of the electrode assembly 20, so as to ensure the connection between the pole assembly 40 and the electrode assembly 20.

[0064] In combination with the above, the end cover assembly 30 includes the electrode terminal 32 and the cover plate 31, which are insulated, ensuring the insulation between the electrode terminal 32 and the electrode post 42, i.e., ensuring the safety of the energy storage device 100. At this time, the electrode post 42 and the bottom plate 13 can be directly connected, i.e., the electrode post 42 and the bottom plate 13 do not need to be insulated; in the related art, the setting of the upper plastic 44 and the lower plastic 43 undoubtedly increases the structural complexity of the electrode post assembly 40.

[0065] Figure 4 The example of the embodiment of the present application provides a sectional structure schematic diagram of an energy storage device 100, Figure 5 The example of the embodiment of the present application provides a sectional structure schematic diagram of an energy storage device 100, Figure 4 The example of the embodiment of the present application provides a sectional structure schematic diagram of an energy storage device 100, Figure 4 And Figure 5 As shown in FIG. 1, the bottom plate 13 of the shell 10 has a mounting hole 131; the electrode post assembly 40 includes a first adapter piece 41 and an electrode post 42, the first adapter piece 41 is a Z-shaped bending structure, and is fixedly connected with the first end of the electrode assembly 20 (such as being welded with the first tab), the electrode post 42 is fixedly connected with the first adapter piece 41 (such as being welded), and passes through the mounting hole 131 and is riveted and limited on the bottom plate 13.

[0066] In this way, on the basis of the direct connection between the electrode post 42 and the bottom plate 13, the structural composition of the electrode post assembly 40 is simplified, thereby facilitating the improvement of the assembly efficiency of the electrode post assembly 40, and the assembly efficiency of the energy storage device 100 is improved. In addition, based on the structural simplification of the electrode post assembly 40, the space utilization rate in the accommodating cavity 11 of the shell 10 is improved, thereby realizing the miniaturization design of the energy storage device 100 or realizing the large-capacity setting of the energy storage device 100.

[0067] The first end of the electrode post 42 is fixedly connected with the first adapter piece 41, and the second end of the electrode post 42 is riveted and fixed on the bottom plate 13, realizing the limiting sealing in the mounting hole 131. The first adapter piece 41 can be a Z-shaped bending structure as shown in FIG. 1. Figure 5 For the first adapter piece 41 with the bending structure, the abutting effect of the electrode post assembly 40 and the bottom plate 13 is facilitated by the elastic stress of the first adapter piece 41, thereby ensuring the sealing effect after the connection of the electrode post assembly 40 and the bottom plate 13.

[0068] In the actual assembly process of the energy storage device 100, for the assembly of the pole assembly 40, the first adapter plate 41 in the flattened state is fixedly connected (such as welded) to the first end of the electrode assembly upper end and the second end of the electrode column 42, the electrode column 42 is inserted through the mounting hole 131 and is riveted and fixed on the bottom plate 13, then the first adapter plate 41 is bent once, the electrode assembly 20 is inserted into the shell, and the first adapter plate 41 is bent twice and the sealing welding of the bottom plate 13 and the wall plate 12 is completed.

[0069] In some embodiments, as shown in Figure 5 , or Figure 6 and Figure 7 , the surface of the bottom plate 13 facing away from the accommodation cavity 11 has a first groove 132 around the mounting hole 131, and the end wall of the electrode column 42 (i.e. the side wall of the second end) has a protruding limiting platform 422, which is limited in the first groove 132.

[0070] In this way, the limiting of the second end of the electrode column 42 in the first groove 132 can be achieved by the limiting of the limiting platform 422 in the first groove 132, so as to achieve the riveting and fixing of the electrode column 42 on the bottom plate 13. For example, after the second end of the electrode column 42 is inserted into the mounting hole 131 on the bottom plate 13, the limiting platform 422 can be formed based on the extrusion deformation of the second end, so as to limit the second end in the first groove 132.

[0071] It should be noted that in addition to the riveting and fixing of the second end of the electrode column 42 to the bottom plate 13 as described above, the riveting and fixing of the second end of the electrode column 42 to the bottom plate 13 can also be achieved by means of a riveting block, which is not limited in the embodiments of the present application.

[0072] In some embodiments, as shown in Figure 8 , the limiting platform 422 is annular. In this way, the limiting area of the limiting platform 422 in the first groove 132 can be increased, so as to ensure the stability of the limiting of the second end of the electrode column 42 in the first groove 132. For example, the limiting platform 422 is a circular ring structure, a rectangular ring structure, etc.

[0073] In some embodiments, the thickness of the limiting platform 422 in the axial direction of the energy storage device 100 is less than the depth of the first groove 132, and the edge of the limiting platform 422 is welded and fixed to the groove wall of the first groove 132.

[0074] In this way, by welding the limiting platform 422 to the groove wall of the first groove 132, not only the stability of the limiting of the limiting platform 422 in the first groove 132 is improved, but also the gap between the limiting platform 422 and the first groove 132 is sealed, so as to ensure the reliability of the assembly of the pole assembly 40.

[0075] The limiting platform 422 is accommodated in the first recess 132, i.e. the second end of the electrode post 42 is hidden in the mounting hole 131, so that the bottom plate 13 of the shell 10 can be used as an output end of the energy storage device 100 to increase the effective contact area of the output end.

[0076] In some embodiments, as shown in Figure 9 , or Figure 10 and Figure 11 , the electrode post assembly 40 further comprises a sealing ring 45, which is sleeved on the electrode post 42 and clamped between the bottom plate 13 and the first adapter plate 41.

[0077] In this way, the gap between the electrode post 42 and the hole wall of the mounting hole 131 can be sealed by the extrusion deformation of the sealing ring 45, and the assembly reliability of the electrode post assembly 40 is ensured.

[0078] Optionally, as shown in Figure 11 , the surface of the bottom plate 13 facing the accommodating cavity 11 has a second recess 133 around the mounting hole 131, and at least part of the sealing ring 45 is limited in the second recess 133. In this way, the sealing ring 45 can be limited by the second recess 133, the assembly reliability of the sealing ring 45 is ensured, and the sealing reliability between the electrode post 42 and the hole wall of the mounting hole 131 is ensured.

[0079] It should be noted that the above two embodiments respectively explain the sealing by welding and the sealing by setting the sealing ring 45, and of course, in addition to the above two ways, other ways can also be used, such as setting a sealing agent between the side wall of the electrode post 42 and the hole wall of the mounting hole 131, or a combination of at least two of the above-mentioned sealing methods, etc. The present embodiment does not limit this.

[0080] In some embodiments, as shown in Figure 6 and Figure 7 , the first adapter plate 41 has a through hole 411, the electrode post 42 comprises a post body 421 and a seat body 423 connected with the post body 421; the post body 421 passes through the through hole 411 and is riveted and fixed with the bottom plate 13, and the first adapter plate 41 is fixedly connected with the seat body 423.

[0081] The column body 421 of the electrode post 42 is riveted and limited in the mounting hole 131, the first adapter piece 41 is limited between the seat body 423 and the bottom plate 13, so that the sealing ring 45 is clamped between the first adapter piece 41 and the bottom plate 13. In this way, the contact area of the pole post assembly 40 and the bottom plate 13 can be effectively increased on the basis of ensuring the connection of the first adapter piece 41 and the electrode assembly 20, thereby increasing the flow capacity of the pole post assembly 40, so as to realize the high-rate charging and discharging of the energy storage device 100. In addition, through the setting of the through hole 411 on the first adapter piece 41, the installation and positioning of the first adapter piece 41 can be realized based on the assembly of the column body 421 of the electrode post 42 in the mounting hole 131, and the central assembly of the first adapter piece 41 is ensured.

[0082] In other embodiments, the end surface of the electrode post 42 abuts against the surface of the first adapter piece 41, and is welded and fixed.

[0083] In this way, the sealing ring 45 can be clamped between the first adapter piece 41 and the bottom plate 13, and the structure of the first adapter piece 41 and the electrode post 42 can be simplified, thereby improving the manufacturing efficiency of the first adapter piece 41 and the electrode post 42. After the abutment of the electrode post 42 and the first adapter piece 41, direct welding is performed, which facilitates the assembly efficiency of the pole post assembly 40.

[0084] The application also provides a power utilization device 400, which can be a user energy storage cabinet, an energy storage container, etc. As shown in the figure, the power utilization device 400 includes the energy storage device 100 described in the above embodiments, and the energy storage device 100 supplies power to the power utilization device 400. In this way, in combination with the above description, the power utilization device 400 of the application can realize the fine setting of the power utilization device 400 or prolong the effective use time of the power utilization device 400 during use. Figure 12

[0085] In the embodiments of the application, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0086] ​In the description of the implementation of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the implementation of the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the implementation of the present application.

[0087] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means 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 present application. In the present application, the illustrative description 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.

[0088] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An energy storage device, characterized by, The application relates to a shell (10) comprising a containing cavity (11) with an opening, and a bottom plate (13) of the shell (10) having a mounting hole (131); an electrode assembly (20) contained in the containing cavity (11), and a first end of the electrode assembly (20) facing the bottom of the shell (10), and a second end of the electrode assembly (20) located on the opening side of the containing cavity (11); a pole column assembly (40) comprising a first adapter sheet (41) and an electrode column (42), the first adapter sheet (41) being a Z-shaped bending structure and being electrically connected with the first end of the electrode assembly (20), and the electrode column (42) being fixedly connected with the first adapter sheet (41), penetrating through the mounting hole (131) and being riveted and limited on the bottom plate (13); and an end cover assembly (30) sealing the opening of the containing cavity (11) and being connected with the second end of the electrode assembly (20). The surface of the bottom plate (13) facing away from the containing cavity (11) has a first sinking groove (132) surrounding the mounting hole (131), and the end side wall of the electrode column (42) has a protruding limiting platform (422) which is limited in the first sinking groove (132). The limiting platform (422) is annular. The thickness of the limiting platform (422) in the axial direction of the energy storage device (100) is smaller than the depth of the first sinking groove (132), and the edge of the limiting platform (422) is welded and fixed with the groove wall of the first sinking groove (132). The pole column assembly (40) further comprises a sealing ring (45) sleeved on the electrode column (42) and clamped between the bottom plate (13) and the first adapter sheet (41).

2. The energy storage device of claim 1, wherein, The surface of the bottom plate (13) facing the containing cavity (11) has a second sinking groove (133) surrounding the mounting hole (131), and at least part of the sealing ring (45) is limited in the second sinking groove (133).

3. The energy storage device of claim 2, wherein, The first adapter sheet (41) has a through hole (411), and the electrode column (42) comprises a seat body (423) and a column body (421) connected with the seat body (423).

4. The energy storage device of claim 3, wherein, The column body (421) penetrates through the through hole (411) and is riveted and fixed with the bottom plate (13), and the first adapter sheet (41) is fixedly connected with the seat body (423).

5. The energy storage device (100) according to any one of claims 1 to 4, characterized in that The end surface of the electrode column (42) abuts against the surface of the first adapter sheet (41) and is welded and fixed.

6. The energy storage device of claim 5, wherein, The end cover assembly (30) comprises a cover plate (31), a second adapter sheet (33) and an electrode terminal (32).

7. The energy storage device of claim 5, wherein, The electrode terminal (32) is arranged through the cover plate (31) and is insulated from the cover plate (31), the second adapter sheet (33) is electrically connected with the electrode terminal (32); and the cover plate (31) seals the opening of the containing cavity (11), and the second adapter sheet (33) is electrically connected with the second end of the electrode assembly (20). ​ 8. The energy storage device of claim 5, wherein, ​ 9. The energy storage device of any one of claims 1-4, wherein, ​ ​ ​ 10. An electric device, characterized by The power utilization device (400) comprises the energy storage device (100) of any one of claims 1-9, and the energy storage device (100) supplies power for the power utilization device (400).

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