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 is provided with a containing cavity with an opening; the electrode assembly is accommodated in the accommodating cavity; the end cover assembly seals the opening of the accommodating cavity; the current collector is located between the electrode assembly and the bottom of the shell and provided with a welding area and an abutting area which are distributed in a corrugated mode, the welding area is connected with the electrode assembly, and the abutting area abuts against the bottom of the shell.

Description

Technical Field

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

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

[0003] In related technologies, secondary batteries typically consist of an end cap assembly, an electrode assembly, and a casing. The actual production process involves separately manufacturing the end cap assembly, electrode assembly, and casing, and then sealing the electrode assembly within the casing using the end cap assembly to form the basic structure of the secondary battery.

[0004] The electrode assembly has a positive tab and a negative tab at each end, respectively. Both the positive tab and the negative tab are connected to the components at both ends of the secondary battery (the bottom of the housing and the electrode terminals of the end cap assembly) through a current collector to complete the assembly of the secondary battery. However, in related art, the current collector connected to the positive tab is a flat plate structure and is completely fixed to the bottom of the housing. This allows the electrode assembly to move within the housing due to assembly tolerances. Consequently, when the secondary battery is transported or subjected to vibration, the shaking of the electrode assembly can easily cause the connection between the positive tab and the current collector to tear, resulting in secondary battery failure. Utility Model Content

[0005] A main purpose of the present application is to provide an energy storage device and an electrical device that can improve the power supply stability of the energy storage device.

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

[0007] According to one aspect of the present application, an energy storage device is provided, comprising: a shell having an open accommodating cavity; an electrode assembly accommodated in the accommodating cavity; an end cover assembly sealing the opening of the accommodating cavity; a current collecting member located between the electrode assembly and the bottom of the shell and having a welding area and an abutting area distributed in a corrugated shape, wherein the welding area is connected to the electrode assembly, and the abutting area abuts the bottom of the shell.

[0008] In the embodiment of the present application, the arrangement of the current collecting member facilitates the connection between the electrode assembly and the bottom of the shell. At the same time, by welding the welding area on the current collecting member to the electrode assembly, and by abutting the abutting area with the bottom of the shell, the electrode assembly is limited in the accommodating cavity of the shell along the center line direction of the energy storage device, thereby avoiding shaking of the electrode assembly in the accommodating cavity and ensuring the reliability of the connection between the electrode assembly and the current collecting member. In addition, when the energy storage device is subjected to external force and causes the electrode assembly to have a tendency to move toward the bottom of the shell, a buffer can be formed by the compression deformation of the welding area and the abutting area in the center line direction of the energy storage device to absorb the hard impact of the electrode assembly, while further ensuring the reliability of the connection between the electrode assembly and the current collecting member.

[0009] According to an embodiment of the present application, the welding area and the abutting area are both fan-shaped and are alternately arranged in the circumferential direction of the current collecting member.

[0010] According to an embodiment of the present application, the current collecting member has four welding areas that are spaced apart and centrally symmetrical, and an abutting area between every two adjacent welding areas.

[0011] According to one embodiment of the present application, the bottom of the shell has a central hole, the center of the current collector has a protrusion facing away from the electrode assembly, and the end of the protrusion is exposed at the opening of the central hole.

[0012] In the embodiments of the present application, a slit weld can be achieved between the exposed protrusion at the opening of the central hole and the bottom of the housing, thereby achieving a connection between the current collector and the bottom of the housing, while avoiding the occurrence of a cold weld between the bottom of the housing and the current collector. In addition, the weld area is directly connected to the protrusion, thereby shortening the current path between the electrode assembly and the bottom of the housing, reducing the problem of excessive heat generation on the current collector.

[0013] According to an embodiment of the present application, the welding area and the abutting area are both annular and are alternately arranged in the radial direction of the current collecting member.

[0014] According to an embodiment of the present application, the current collecting member has a welding area located in the center and an abutting area located outside the welding area.

[0015] According to an embodiment of the present application, the bottom of the shell has a central hole, the welding area has a protrusion facing away from the electrode assembly, and the end of the protrusion is exposed at the opening of the central hole.

[0016] In the embodiments of the present application, a slit weld can be achieved between the exposed protrusion at the opening of the central hole and the bottom of the housing, thereby achieving a connection between the current collector and the bottom of the housing, while avoiding the occurrence of a cold weld between the bottom of the housing and the current collector. In addition, the weld area is directly connected to the protrusion, thereby shortening the current path between the electrode assembly and the bottom of the housing, reducing the problem of excessive heat generation on the current collector.

[0017] According to an embodiment of the present application, the current collecting member has an abutting area located in the center and a welding area located at the periphery of the abutting area.

[0018] According to an embodiment of the present application, the bottom of the shell has a central hole, the abutment area has a protrusion facing away from the electrode assembly, and the end of the protrusion is exposed at the opening of the central hole.

[0019] In the embodiment of the present application, a convex column exposed at the orifice of the center hole can be used to achieve gap welding between the convex column and the bottom of the shell, thereby achieving connection between the current collecting part and the bottom of the shell, while avoiding the occurrence of cold welding between the bottom of the shell and the current collecting part.

[0020] According to one embodiment of the present application, in the centerline direction of the energy storage device, the distance between the bottom of the shell and the electrode assembly is smaller than the distance between the welding area and the abutment area when the current collector is in a natural state.

[0021] In the embodiment of the present application, the welding area of ​​the current collecting member is welded to the electrode assembly. After the electrode assembly is inserted into the shell and the end cover assembly seals the opening of the shell, the abutment area abuts against the bottom of the shell, and the current collecting member is in a compressed state in the direction of the center line of the energy storage device, thereby preventing the electrode assembly from shaking in the accommodating cavity of the shell based on the reverse action force of the current collecting member.

[0022] According to one embodiment of the present application, the current collecting member has a connection area, which connects the welding area and the abutment area in the circumferential direction of the current collecting member, and the connection area is an arc-shaped bending structure.

[0023] In the embodiment of the present application, by setting the connection area, direct connection between the welding area and the abutment area is achieved, thereby facilitating the increase of the flow area on the current collecting member and avoiding the problem of melting the connection between the welding area and the central area.

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

[0025] 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

[0026] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

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

[0028] Figure 2 is a schematic cross-sectional structural diagram of an energy storage device according to an exemplary embodiment.

[0029] Figure 3 FIG1 is a schematic diagram of a partial explosion structure of an energy storage device according to an exemplary embodiment.

[0030] Figure 4 yes Figure 3 A partially enlarged structural schematic diagram of the energy storage device shown.

[0031] Figure 5 It is a schematic diagram of the axial structure of a current collecting member according to an exemplary embodiment.

[0032] Figure 6 is a schematic cross-sectional structural diagram of another current collecting member according to an exemplary embodiment.

[0033] Figure 7 FIG. 1 is a schematic cross-sectional structural diagram of another current collecting member according to an exemplary embodiment.

[0034] Figure 8 FIG. 1 is a schematic cross-sectional structural diagram of another current collecting member according to an exemplary embodiment.

[0035] Figure 9 It is a schematic structural diagram of an electric device according to an exemplary embodiment.

[0036] The description of the accompanying drawings is as follows:

[0037] 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment;

[0038] 10. Housing; 20. Electrode assembly; 30. End cap assembly; 40. Current collector;

[0039] 11. Accommodating cavity; 12. Bottom; 13. Center hole;

[0040] 41. Welding area; 42. Abutment area; 43. Connection area; 44. Boss. DETAILED DESCRIPTION

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0042] Since the energy people need is highly temporal and spatial, in order to make rational use of energy and improve utilization rate, it is necessary to use a medium or equipment to store one form of energy in the same energy form, or convert it into another form of energy, and then release it in a specific energy form based on future applications.

[0043] At present, green energy mainly includes solar energy, wind energy, etc., which generally have the problems of strong intermittency and large volatility, which will cause the voltage of the green power grid to be unstable (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0044] To address the issue of insufficient electricity demand or insufficient grid capacity, energy storage devices are essential. These devices convert electrical energy into other forms of energy through physical or chemical means, storing it. When needed, the stored energy is converted back into electricity and released. Simply put, an energy storage device acts like a large "power bank," storing electricity when there's sufficient solar or wind energy and releasing it when needed.

[0045] Currently, energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0046] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0047] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period; during the peak electricity price period, the electricity in the energy storage device is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0048] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store or supply electric energy through the energy storage device.

[0049] 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 an embodiment of the present application is shown. The energy storage system includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, household appliance, etc.). The electric energy conversion device 200 is electrically connected to the energy storage device 100, and the energy storage device 100 is electrically connected to the user load 300. The energy storage device 100 is a small energy storage box that can be mounted on an outdoor wall by wall-mounting. Specifically, the electric energy conversion device 200 can convert solar energy into electrical energy and store it through the energy storage device 100, and then supply the user load 300 for use when the electricity price is peak, or supply the user load 300 for use when the power grid is outage / power outage.

[0050] The energy storage device 100 may be, but is not limited to, a single battery (secondary battery), as well as a battery module, battery pack, battery system, etc. composed of single batteries. Battery cells may be lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and may be cylindrical, flat, or rectangular, etc., which is not limited in the embodiments of this application.

[0051] Taking the energy storage device 100 as a cylindrical battery cell as an example, the energy storage device 100 can achieve charging and discharging through chemical reactions or changes in the energy storage medium (chemical elements). Simply put, the electrical energy generated by solar energy and wind energy is stored in the energy storage device 100 through chemical reactions or changes in the energy storage medium. When external power usage reaches a peak, the stored electrical energy in the energy storage device 100 is released for use or transferred for later use through chemical reactions or changes in the energy storage medium.

[0052] In some embodiments, as Figure 2 As shown, the energy storage device 100 includes: a shell 10, an electrode assembly 20 and an end cover assembly 30. The shell 10 has an open accommodating cavity 11, the electrode assembly 20 is accommodated in the accommodating cavity 11, and the end cover assembly 30 seals the opening of the accommodating cavity 11.

[0053] Among them, the shell 10 is a accommodating cavity 11 with an opening at one end. At this time, the shell 10 can be an integrated structure, that is, the bottom 12 of the shell 10 is the bottom plate on the shell 10 opposite to the end cover assembly 30, and the current collecting part 40 is located between the bottom plate and the electrode assembly 20; of course, the shell 10 can also be a accommodating cavity 11 with an opening at one end formed by welding the cylinder and the cover plate. At this time, the bottom 12 of the shell 10 is the cover plate included in the shell 10, and the current collecting part 40 is located between the cover plate and the electrode assembly 20.

[0054] Among them, the end cap assembly 30 includes a cover plate and an electrode terminal. The electrode terminal is inserted into the cover plate, and one end is connected to the electrode assembly 20, and the other end is exposed outside the shell 10 to serve as an output end of the energy storage device 100; the cover plate is also provided with an explosion-proof valve and a liquid injection hole. The explosion-proof valve is used to discharge the gas in the accommodating cavity of the battery shell 10 to improve the safety of the use of the energy storage device 100, and the liquid injection hole is used to inject electrolyte into the accommodating cavity 11 of the energy storage device 100.

[0055] The electrode assembly 20 includes a stacked positive electrode sheet, a negative electrode sheet, and a separator, with the separator positioned between the positive and negative electrode sheets. Both the positive and negative electrode sheets have tabs extending to the ends of the electrode assembly 20, forming the positive and negative tabs of the electrode assembly 20. The positive and negative tabs are located at different ends of the electrode assembly 20. One of the positive and negative tabs is connected to the electrode terminal included in the end cap assembly 30, and the other is connected to the bottom 12 of the housing 10, enabling electrical energy output through the electrode terminal and the bottom 12 of the housing 10.

[0056] In some embodiments, as Figure 2 、 Figure 3 and Figure 4 As shown, the energy storage device 100 also includes a current collecting member 40, which is located between the electrode assembly 20 and the bottom 12 of the shell 10, and has a welding area 41 and an abutting area 42 distributed in a corrugated shape. The welding area 41 is connected to the electrode assembly 20, and the abutting area 42 abuts against the bottom 12 of the shell 10.

[0057] In this way, the arrangement of the current collector 40 facilitates the connection between the electrode assembly 20 and the bottom 12 of the shell 10. At the same time, by welding the welding area 41 on the current collector 40 to the electrode assembly 20, and by abutting the abutment area 42 with the bottom 12 of the shell 10, the electrode assembly 20 is limited in the accommodating cavity 11 of the shell 10 along the center line direction of the energy storage device 100, thereby avoiding the shaking of the electrode assembly 20 in the accommodating cavity 11 and ensuring the reliability of the connection between the electrode assembly 20 and the current collector 40; in addition, when the energy storage device 100 is subjected to external force and causes the electrode assembly 20 to have a tendency to move toward the bottom 12 of the shell 10, a buffer can be formed by the compression deformation of the welding area 41 and the abutment area 42 in the center line direction of the energy storage device 100 to absorb the hard impact of the electrode assembly 20, while further ensuring the reliability of the connection between the electrode assembly 20 and the current collector 40; furthermore, the corrugated distribution of the welding area 41 and the abutment area 42 facilitates the simplification of the process and the improvement of the production efficiency.

[0058] The welding area 41 and the electrode assembly 20 may be in surface-to-surface contact to ensure sufficient welding area between the welding area 41 and the electrode assembly 20, thereby ensuring sufficient flow area between the current collector 40 and the electrode assembly 20. For example, the welding area 41 is a planar structure, such as a fan-shaped structure or an annular structure. The abutting area 42 and the bottom 12 of the housing 10 may be in line-surface contact or surface-to-surface contact, as long as abutment between the abutting area 42 and the bottom 12 of the housing 10 is achieved. For example, the abutting area 42 and the bottom 12 of the housing 10 are in line-surface contact.

[0059] Among them, taking the cylindrical energy storage device 100 described above as an example, the current collecting member 40 is a disc-shaped structure, and the centerline direction of the energy storage device 100 is the height direction of the energy storage device 100 when it is placed upright. In the centerline direction of the energy storage device 100, it can be that when the current collecting member 40 is in a natural state, the distance between the welding area 41 and the abutment area 42 is equal to the distance between the bottom 12 of the shell 10 and the electrode assembly 20. At this time, after the welding area 41 of the current collecting member 40 is welded to the electrode assembly 20, the electrode assembly 20 is inserted into the shell and the end cover assembly 30 seals the opening of the shell 10, the abutment area 42 just contacts the bottom 12 of the shell 10, thereby preventing the electrode assembly 20 from shaking in the accommodating cavity 11 of the shell 10; it can also be that when the current collecting member 40 is in a natural state, the distance between the welding area 41 and the abutment area 42 is greater than the distance between the bottom 12 of the shell 10. The distance between the bottom 12 and the electrode assembly 20 is greater than the sum of the distance between the bottom 12 of the shell 10 and the electrode assembly 20 and the movable distance of the electrode assembly 20 in the direction toward the end cover assembly 30. At this time, after the welding area 41 of the current collector 40 is welded to the electrode assembly 20, the electrode assembly 20 is inserted into the shell and the end cover assembly 30 seals the opening of the shell 10, the abutment area 42 abuts against the bottom 12 of the shell 10, and the current collector 40 is in a compressed state in the centerline direction of the energy storage device 100, thereby avoiding the shaking of the electrode assembly 20 in the accommodating cavity 11 of the shell 10 based on the reverse action force of the current collector 40.

[0060] In the embodiment of the present application, the welding area 41 and the contact area 42 on the current collecting member 40 may be as follows: Figure 5 As shown, the welding area 41 and the contact area 42 are both fan-shaped and are alternately arranged in the circumferential direction of the current collecting member 40; Figure 6 or Figure 7 As shown, the welding area 41 and the abutting area 42 are both annular and alternately arranged in the radial direction of the current collecting member 40 .

[0061] The number of welding areas 41 and abutment areas 42 on the current collector 40 can be equal or unequal, as long as the welding areas 41 on the current collector 40 are sufficiently large to ensure sufficient flow area after the welding areas 41 are welded to the electrode assembly 20. Furthermore, the current collector 40, including the welding areas 41 and abutment areas 42, can be formed by a stamping process, that is, by combining and extruding two contoured dies, thereby simplifying the manufacturing process of the current collector 40.

[0062] Taking the case where the welding areas 41 and the abutment areas 42 are alternately arranged in the circumferential direction of the current collecting member 40 as an example, the number of the welding areas 41 and the abutment areas 42 is equal, for example, the current collecting member 40 has two welding areas 41 spaced apart along the circumferential direction, and the abutment area 42 located between the two welding areas 41; or Figure 5As shown, the current collecting member 40 has four welding areas 41 spaced apart along the circumferential direction, and an abutting area 42 located between every two adjacent welding areas 41 .

[0063] Among them, the multiple welding areas 41 and the multiple abutment areas 42 on the current collecting part 40 are evenly distributed along the circumference of the current collecting part 40 to ensure the stability of the connection between the current collecting part 40 and the electrode assembly 20, and at the same time ensure the uniformity of the force when the current collecting part 40 abuts against the bottom 12 of the shell 10.

[0064] When the abutting area 42 of the current collecting member 40 abuts the bottom 12 of the housing 10, penetration welding can be performed on the bottom 12 of the housing 10 to achieve welding between the bottom 12 of the housing 10 and the abutting area 42. At this time, in order to ensure the stability of the welding between the current collecting member 40 and the bottom 12 of the housing 10 and to ensure the flow area between the current collecting member 40 and the bottom 12 of the housing 10, the abutting area 42 and the bottom 12 of the housing 10 can be in surface contact, that is, the abutting area 42 has a planar structure.

[0065] Of course, in addition to performing penetration welding on the bottom 12 of the shell 10 to connect the abutment area 42 to the bottom 12 of the shell 10, it is also possible to Figure 4 and Figure 5 As shown, the bottom 12 of the shell 10 has a central hole 13 , and the center of the current collector 40 has a protrusion 44 facing away from the electrode assembly 20 , with the end of the protrusion 44 exposed at the opening of the central hole 13 .

[0066] In this way, the exposed protrusion 44 at the opening of the central hole 13 can be used to achieve a gap weld between the protrusion 44 and the bottom 12 of the housing 10, thereby achieving a connection between the current collector 40 and the bottom 12 of the housing 10, while avoiding the occurrence of a cold weld between the bottom 12 of the housing 10 and the current collector 40. In addition, the welding area 41 is directly connected to the protrusion 44, thereby shortening the current path between the electrode assembly 20 and the bottom 12 of the housing 10 and reducing the problem of excessive heat generation on the current collector 40.

[0067] The current collector 40 includes a central area and a peripheral area located outside the central area. The peripheral area includes a welding area 41 and abutment area 42 arranged alternately along the circumferential direction. The central area of ​​the current collector 40 is the center position of the current collector 40, and the central area of ​​the current collector 40 has a boss 44 facing away from the electrode assembly 20. In addition, in addition to being able to pass through the center hole 13 and be fixedly connected to the bottom 12 of the shell 10, the boss 44 can also be provided with an injection hole sealed by a sealing nail on the boss 44, and the injection hole also passes through the central area of ​​the current collector 40 to facilitate the injection of liquid into the shell 10 along the injection hole on the boss 44.

[0068] In addition, the welding area 41 and the abutment area 42 can be a structure that is disconnected in the circumferential direction of the current collecting member 40 to reduce the resistance of the current collecting member 40 when elastically compressed in the center line direction of the energy storage device 100, while reducing the material used in the current collecting member 40 to achieve the purpose of cost saving.

[0069] Of course, it can also be Figure 5 As shown, the current collector 40 has a connection area 43, which connects the welding area 41 and the abutment area 42 in the circumferential direction of the current collector 40. In this way, the provision of the connection area 43 realizes a direct connection between the welding area 41 and the abutment area 42, thereby facilitating the increase of the flow area on the current collector 40 and avoiding the problem of melting the connection between the welding area 41 and the central area.

[0070] The connection area 43 connects the adjacent welding area 41 and the abutment area 42 in the circumferential direction, so that the current collecting member 40 is corrugated in the circumferential direction. The connection area 43 can be an inclined plane structure, an arc-shaped bending structure, a wavy structure, etc. When the connection area 43 is a planar structure, the plane where the connection area 43 is located intersects with the center line direction of the energy storage device 100 and is not perpendicular; when the connection area 43 is as follows Figure 5 When the arc-shaped bending structure is shown, the current collecting member 40 can reduce the resistance of the current collecting member 40 when it is elastically compressed in the direction of the center line of the energy storage device 100 in the circumferential direction.

[0071] Taking the case where the welding areas 41 and the abutting areas 42 are alternately arranged in the radial direction of the current collecting member 40 as an example, the number of the welding areas 41 and the abutting areas 42 can be equal, or the difference between the number of the two can be 1. Figure 6 or Figure 7 As shown, the current collecting member 40 has a welding area 41 and an abutting area 42 which are distributed at intervals along the radial direction and are both annular; or as shown in FIG. Figure 8 As shown, the current collecting member 40 has two annular welding areas 41 that are spaced apart in the radial direction, and an annular abutting area 42 that is located between the two welding areas 41 .

[0072] Alternatively, as Figure 6 As shown, the current collecting member 40 has a welding area 41 located in the center and an abutting area 42 located at the periphery of the welding area 41 .

[0073] In this case, penetration welding can be performed on the bottom 12 of the housing 10 to achieve welding between the bottom 12 of the housing 10 and the abutment area 42. At this time, in order to ensure the stability of the welding between the current collecting member 40 and the bottom 12 of the housing 10 and to ensure the flow area between the current collecting member 40 and the bottom 12 of the housing 10, the abutment area 42 and the bottom 12 of the housing 10 can be in surface contact, that is, the abutment area 42 is annular.

[0074] Of course, in addition to performing penetration welding on the bottom 12 of the shell 10 to achieve the connection between the abutment area 42 and the bottom 12 of the shell 10, the bottom 12 of the shell 10 can also have a center hole 13, and the welding area 41 can have a protrusion 44 facing away from the electrode assembly 20; the end of the protrusion 44 protrudes from the abutment area 42 and is exposed at the opening of the center hole 13.

[0075] In this way, the exposed protrusion 44 at the opening of the central hole 13 can be used to achieve a gap weld between the protrusion 44 and the bottom 12 of the housing 10, thereby achieving a connection between the current collector 40 and the bottom 12 of the housing 10, while avoiding the occurrence of a cold weld between the bottom 12 of the housing 10 and the current collector 40. In addition, the welding area 41 is directly connected to the protrusion 44, thereby shortening the current path between the electrode assembly 20 and the bottom 12 of the housing 10 and reducing the problem of excessive heat generation on the current collector 40.

[0076] Alternatively, as Figure 7 As shown, the current collecting member 40 has an abutting area 42 located in the center and a welding area 41 located at the periphery of the abutting area 42 .

[0077] In this case, penetration welding can be performed on the bottom 12 of the housing 10 to achieve welding between the bottom 12 of the housing 10 and the abutment area 42. At this time, in order to ensure the stability of the welding between the current collecting member 40 and the bottom 12 of the housing 10 and to ensure the flow area between the current collecting member 40 and the bottom 12 of the housing 10, the abutment area 42 and the bottom 12 of the housing 10 can be in surface contact, that is, the abutment area 42 is circular.

[0078] Of course, in addition to performing penetration welding on the bottom 12 of the shell 10 to achieve connection between the abutment area 42 and the bottom 12 of the shell 10, the bottom 12 of the shell 10 can also have a center hole 13, and the current collecting part 40 can have a boss 44 facing away from the electrode assembly 20, and the end of the boss 44 is exposed at the opening of the center hole 13.

[0079] In this way, the exposed boss 44 at the opening of the center hole 13 can be used to achieve gap welding between the boss 44 and the bottom 12 of the shell 10, thereby achieving connection between the current collecting part 40 and the bottom 12 of the shell 10, while avoiding the occurrence of cold welding between the bottom 12 of the shell 10 and the current collecting part 40.

[0080] It should be noted that if Figure 6 、 Figure 7 or Figure 8 As shown, the current collecting member 40 has a connecting area 43, which connects the welding area 41 and the abutting area 42. Thus, the connection area 43 realizes the integrated setting of the welding area 41 and the abutting area 42, while facilitating the increase of the flow area on the current collecting member 40.

[0081] The connection area 43 connects the adjacent welding area 41 and the abutment area 42 in the radial direction, so that the current collecting member 40 is corrugated in the radial direction. The connection area 43 can be a planar structure, an arc-shaped bending structure, a wavy structure, etc. When the connection area 43 is a planar structure, the plane where the connection area 43 is located intersects with the center line direction of the energy storage device 100 and is not perpendicular; when the connection area 43 is as follows Figure 6 or Figure 7 The arc-shaped bending structure shown can help reduce the resistance of the current collecting member 40 when it is elastically compressed in the direction of the center line of the energy storage device 100.

[0082] The embodiment of the present application also provides an electric device 400, which can be a user energy storage cabinet, an energy storage container, etc. Figure 9 As shown, the electrical device 400 includes the energy storage device 100 described in the above embodiment, and the energy storage device 100 supplies power to the electrical device 400. Thus, in combination with the above, the electrical device 400 of the present application can ensure the stability of the electrical device 400 during use based on the stability of the power supply of the energy storage device 100.

[0083] 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.

[0084] In the description of the embodiments of the present application, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present application.

[0085] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the implementation methods of this application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0086] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An energy storage device, characterized in that: include: A housing (10) having an open accommodating cavity (11); An electrode assembly (20) is accommodated in the accommodating cavity (11); an end cap assembly (30) for sealing the opening of the accommodating cavity (11); A current collecting member (40) is located between the electrode assembly (20) and the bottom (12) of the shell (10), and has a welding area (41) and an abutting area (42) distributed in a corrugated shape, wherein the welding area (41) is connected to the electrode assembly (20), and the abutting area (42) abuts against the bottom (12) of the shell (10).

2. The energy storage device according to claim 1, wherein The welding area (41) and the abutting area (42) are both fan-shaped and are alternately arranged in the circumferential direction of the current collecting member (40).

3. The energy storage device according to claim 2, characterized in that The current collecting member (40) has four welding areas (41) that are spaced apart and centrally symmetrical, and an abutting area (42) located between every two adjacent welding areas (41).

4. The energy storage device according to claim 2, characterized in that The bottom (12) of the shell (10) has a central hole (13), the center of the current collecting member (40) has a protrusion (44) facing away from the electrode assembly (20), and the end of the protrusion (44) is exposed at the opening of the central hole (13).

5. The energy storage device according to claim 1, wherein The welding area (41) and the abutting area (42) are both annular and are alternately arranged in the radial direction of the current collecting member (40).

6. The energy storage device according to claim 5, characterized in that The current collecting member (40) has a welding area (41) located in the center and an abutting area (42) located at the periphery of the welding area (41).

7. The energy storage device according to claim 6, characterized in that The bottom (12) of the shell (10) has a central hole (13), the welding area (41) has a protrusion (44) facing away from the electrode assembly (20), and the end of the protrusion (44) is exposed at the opening of the central hole (13).

8. The energy storage device according to claim 5, characterized in that The current collecting member (40) has an abutment area (42) located in the center and a welding area (41) located at the periphery of the abutment area (42).

9. The energy storage device according to claim 8, characterized in that The bottom (12) of the shell (10) has a central hole (13), the abutment area (42) has a protrusion (44) facing away from the electrode assembly (20), and the end of the protrusion (44) is exposed at the opening of the central hole (13).

10. The energy storage device according to any one of claims 1 to 9, characterized in that: In the centerline direction of the energy storage device (100), the distance between the bottom (12) of the shell (10) and the electrode assembly (20) is smaller than the distance between the welding area (41) and the abutment area (42) when the current collecting member (40) is in a natural state.

11. The energy storage device according to any one of claims 1 to 4, characterized in that: The current collecting member (40) has a connecting area (43), the connecting area (43) connects the welding area (41) and the abutting area (42) in the circumferential direction of the current collecting member (40), and the connecting area (43) is an arc-shaped bending structure.

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

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