CN116387765A

CN116387765A - Current collecting disc, end cover assembly, energy storage device and electric equipment

Info

Publication number: CN116387765A
Application number: CN202310487587.2A
Authority: CN
Inventors: 熊永锋; 陈志雄; 李奇
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-07-04
Also published as: WO2024222071A1

Abstract

The application provides a current collecting tray, end cover subassembly, energy memory and consumer, current collecting tray include first disk body portion and extension, extension and first disk body portion fixed connection, and extension and first disk body portion integrated into one piece.

Description

Current collecting disc, end cover assembly, energy storage device and electric equipment

Technical Field

The application relates to the technical field of energy storage devices, in particular to a current collecting disc, an end cover assembly, an energy storage device and electric equipment.

Background

The energy storage device generally comprises an electrode assembly, a shell and an end cover assembly, wherein the electrode assembly is arranged in the shell, and the end cover assembly is arranged in the shell to realize sealing. Wherein, the end cap assembly is electrically connected with the electrode assembly through the current collecting plate. In the existing collecting tray, the tray body and the handle body are often connected together through welding.

Disclosure of Invention

The applicant finds that metal burrs or fine scraps generated during welding of the disc body and the handle body easily cut the electrode lugs of the electrode assembly or enter the electrode assembly to cause short circuit, so that the use reliability of the energy storage device is reduced.

The purpose of this application is to provide a mass flow dish, end cover subassembly, energy memory and consumer for solve disk body and the welding of handle body in the current mass flow dish, reduce energy memory reliability's problem.

In a first aspect, embodiments of the present application provide a current collecting tray, including a first tray body portion and an extension portion, the extension portion with first tray body portion fixed connection, and the extension portion with first tray body portion integrated into one piece.

In one embodiment, the first disc portion includes a first face, a second face and a peripheral face, the first face and the second face are disposed opposite to each other along a thickness direction of the first disc portion, the peripheral face is connected between the first face and the second face, the first disc portion is provided with a notch, the notch is disposed at the peripheral face of the first disc portion and penetrates through the first face and the second face, the notch results in one main wall surface and two side wall surfaces formed on the first disc portion, and the two side wall surfaces are connected to opposite sides of the main wall surface;

the extension part is fixedly connected to the main wall surface and is arranged at intervals with the two side wall surfaces.

In one embodiment, the extension includes a bending section and a first extension section, the bending section being connected between the main wall and the first extension section, the bending section having a stress fatigue greater than a stress fatigue of the first disk portion and the first extension section;

the collecting tray has a folded state and an unfolded state, and when the collecting tray is in the folded state, the extension part is folded relative to the first tray body part; when the collecting tray is in the unfolding state, the extension part is unfolded relative to the first tray body, and the extension part and the first tray body are in the same plane.

When the collecting disc is in the folded state, the bending section bends, and the first extending section is spaced from and oppositely arranged with the first disc body; when the collecting disc is in an unfolding state, the bending section is unfolded relative to the first disc body and the first extension section.

In one embodiment, the width dimension W of the bending section is greater than or equal to 1.5mm and less than or equal to 3mm.

In one embodiment, the second surface is provided with a plurality of first reinforcing ribs, and the plurality of first reinforcing ribs are located at positions, adjacent to the notch, of the first disc body, are arranged at intervals, and extend along the direction of the first disc body towards the bending section;

the first extension section is provided with a plurality of second reinforcing ribs, and the second reinforcing ribs are positioned at one end of the first extension section facing the bending section and are arranged at intervals, and extend along the direction from the first extension section to the bending section.

In one embodiment, the end faces of the plurality of first reinforcing ribs facing the bending section are flush, and are coplanar with the end faces of the bending section connected with the first disc body; the second reinforcing ribs face the end face of the bending section in a flush mode and are coplanar with the end face of the bending section, connected with the first extending section.

In one embodiment, the first extension section includes a first surface and a second surface, and the first surface and the second surface are disposed opposite to each other along a thickness direction of the first extension section; the second reinforcing ribs protrude relative to the second surface;

when the collecting tray is in the folded state, the first surface is opposite to the first surface, and the second surface is opposite to the second surface.

In one embodiment, the distance between two adjacent first reinforcing ribs gradually increases along the direction from the notch to the center of the first disc portion.

In one embodiment, the extension part further comprises the second extension section, and the second extension section is connected to one end of the first extension section away from the bending section;

when the collecting disc is in the folded state, the part of the second extension section, which faces the first extension section, is bent, and the part of the second extension section, which is far away from the first extension section, is spaced from and oppositely arranged with the first extension section.

In one embodiment, the first surface of the first disc portion is provided with a first welding groove, and a groove bottom wall of the first welding groove protrudes relative to the second surface.

In one embodiment, the collecting tray further comprises a second tray body, wherein the second tray body is installed in the notch and is overlapped with the first tray body; the second tray body is arranged at intervals with the extension part.

In one embodiment, the second tray body includes a body and two overlapping members, the two overlapping members are disposed opposite to each other at two ends of the body and overlap the first tray body;

the body is relative first disk body portion protrusion, the body is equipped with the second welding groove, the mass flow disk is in when expanding the state, the body is located one side in extension thickness direction, and with extension interval setting, the tank bottom wall of second welding groove is relative the body deviates from the surface protrusion of extension.

In one embodiment, the distance D of the body protruding the first disc portion is greater than or equal to 0.2mm and less than or equal to 0.8mm.

In a second aspect, embodiments of the present application provide an end cap assembly, including an end cap and the current collecting plate, the current collecting plate is mounted on one side of the end cap in a thickness direction.

In a third aspect, an embodiment of the present application provides an energy storage device, which is characterized by comprising a housing, an electrode assembly and an end cover assembly, wherein the housing has an opening, a housing cavity is provided in the housing, the electrode assembly is housed in the housing cavity, the end cover assembly is mounted at the opening at one end of the housing, and the current collecting disc is electrically connected with the electrode assembly.

In a fourth aspect, an embodiment of the present application provides an electric apparatus, where the electric apparatus includes the energy storage device, and the energy storage device supplies power to the electric apparatus.

The embodiment of the application provides an integrated into one piece's current collecting tray, has avoided the influence of welding process to electrode assembly, simultaneously through setting up the breach, avoided buckling process to pull the utmost point ear, promoted the connection stability of current collecting tray and utmost point ear. Further, according to the embodiment of the application, the second tray body is welded with the electrode lugs, so that the contact area of the current collecting tray and the electrode lugs is further enlarged, and the uniformity of current collecting of the current collecting tray and the electrode assembly is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an application scenario diagram of an energy storage system provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of an energy storage device according to a first embodiment of the present disclosure;

FIG. 3 is a schematic view of an electrode assembly of the energy storage device shown in FIG. 2;

FIG. 4 is an exploded view of the end cap assembly of the energy storage device of FIG. 2;

FIG. 5 is a cross-sectional structural view of an end cap assembly of the energy storage device of FIG. 2;

FIG. 6 is a schematic view of the first insulating member of the end cap assembly of FIG. 4 from another perspective;

fig. 7 is a schematic view of the structure of the manifold plate of the end cap assembly of fig. 4;

fig. 8 is a schematic view of the current collecting tray of fig. 7 in an expanded state;

fig. 9 is a schematic view of the current collecting plate of fig. 8 from another view angle;

FIG. 10 is a schematic view of a portion of the energy storage device of FIG. 2 during assembly;

fig. 11 is a schematic structural view of a current collecting tray according to a second embodiment of the present application in an expanded state;

FIG. 12 is a schematic view of a second tray unit according to a second embodiment of the present disclosure;

fig. 13 is a cross-sectional view of the current collecting plate of fig. 11 taken along the direction A-A;

fig. 14 is a schematic view of a portion of an energy storage device in a partially bent state according to a second embodiment of the present disclosure.

Reference numerals: an energy storage system 1000; the power conversion device 600; a user load 500; an energy storage device 400; a housing 100; an end cap assembly 200; an electrode assembly 300; mandrel region 310; a negative electrode tab 330; an end cap 10; a fixing hole 12; a pressure relief vent 14; a mounting groove 15; an explosion-proof valve 20; a protector 21; a post 30; a column portion 31; a carrier portion 33; a first insulating member 40; an insulating body 41; a bump 42; a through hole 44; a conductive compact 50; a connection hole 53; a second insulating member 60; a mounting hole 63; a through hole 64; a collecting tray 80; a seal 90; a first tray portion 81; a through hole 811; notch 812; a first welding groove 813; a first face 814; a second face 815; a main wall 816; side wall faces 817; a first reinforcing rib 818; an extension 82; bending segment 821; a first extension 822; a second extension 823; a first surface 801; a second surface 802; second reinforcing ribs 824; a second tray portion 83; a body 830; a third face 831; fourth face 832; a bridge 834; a first section 835; a second segment 836; a second weld groove 837.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. As is well known, to achieve the great goal of carbon neutralization, the main approach to green electric energy generation is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources.

At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. I.e. the electric energy is converted into other forms of energy by physical or chemical means for storage, and the energy is converted into electric energy to be released when needed. In short, the energy storage is similar to a large-scale 'charge pal', when the photovoltaic and wind energy are sufficient, the electric energy is stored, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, an embodiment of the present application provides an energy storage device 400, in which a group of chemical batteries are disposed in the energy storage device 400, chemical elements in the chemical batteries are mainly utilized as energy storage media, and a charging and discharging process is accompanied with chemical reaction or change of the energy storage media, that is, electric energy generated by wind energy and solar energy is simply stored in the chemical batteries, and when the use of external electric energy reaches a peak, the stored electric quantity is released for use, or is transferred to a place where the electric quantity is short for reuse.

The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as power generation side energy storage, electric network side energy storage, renewable energy grid-connected energy storage, user side energy storage and the like, the types of corresponding energy storage devices include:

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;

(2) The main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.

Referring to fig. 1, fig. 1 is an application scenario diagram of an energy storage system 1000 according to an embodiment of the present application.

Referring to fig. 1, the embodiment of the present application is illustrated by taking a household energy storage scenario in a user side energy storage as an example, but it should be understood that the energy storage system 1000 provided in the present application is not limited to the household energy storage scenario. In this embodiment, the energy storage system 1000 may be a household storage system. The energy storage system 1000 includes an electrical energy conversion device 600, a user load 500, and an energy storage device 400. The energy storage device 400 is a small-sized energy storage box, and can be installed on an outdoor wall in a wall-hanging manner. For example, the power conversion device 600 may be a photovoltaic panel. The power conversion device 600 may convert solar energy into electric energy at a low electricity price period. The energy storage device 400 is used to store the electric energy and supply the electric energy to the consumer load 500 such as a street lamp and a household appliance for use at the time of peak electricity price, or to supply the electric energy at the time of power failure/power outage of the power grid. In this embodiment, the energy storage device 400 may be, but is not limited to, a single battery, a battery module, a battery pack, a battery system, and the like. For example, when the energy storage device 400 is a single battery, it may be a cylindrical battery or a prismatic battery.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an energy storage device 400 according to a first embodiment of the present disclosure.

In this embodiment, the energy storage device 400 is a cylindrical lithium-ion battery. The energy storage device 400 includes a case 100, an electrode assembly (not shown in fig. 2), and two end cap assemblies 200. The case 100 is a cylindrical case, the case 100 has two openings, the case 100 is provided with a receiving chamber, the openings are disposed at both sides of the receiving chamber, and the electrode assembly 300 is received in the receiving chamber. Along the height direction of the case 100, two end cap assemblies 200 are respectively mounted at the openings of opposite sides of the case 100, and are electrically connected to the electrode assemblies.

Specifically, the electrode assembly comprises a positive plate, a negative plate and a diaphragm, wherein the positive plate and the negative plate are arranged at intervals and are opposite to each other, and the diaphragm is positioned between the positive plate and the negative plate. The tab of the positive plate is a positive tab, the tab of the negative plate is a negative tab, and the positive tab and the negative tab are arranged opposite to each other. Of the two end cap assemblies 200, one end cap assembly 200 is a negative side end cap assembly and the other end cap assembly 200 is a positive side end cap assembly. The end cap assembly 200 on the negative side is electrically connected with the negative electrode tab in the electrode assembly, and the end cap assembly 200 on the positive side is electrically connected with the positive electrode tab in the electrode assembly, thereby achieving electrical connection between the two end cap assemblies 200 and the electrode assembly.

In this embodiment, the electrode assembly is placed in the case 100, two end cap assemblies 200 are respectively connected to both ends of the electrode assembly, and two end cap assemblies 200 are respectively mounted to opposite ends of the case 100, and then electrolyte is injected from the end cap assemblies 200 at the positive electrode side to assemble the energy storage device 400. The electrode assembly is immersed in the electrolyte, and an electrochemical reaction can occur between the electrode assembly and the electrolyte, and the chemical energy is converted into electric energy, so that the energy storage device 400 can store the electric energy and output the electric energy.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an electrode assembly 300 in the energy storage device 400 shown in fig. 2.

The electrode assembly 300 is generally cylindrical and is formed by sequentially stacking a positive electrode sheet, a separator, and a negative electrode sheet and then winding the stacked positive electrode sheet, separator, and negative electrode sheet. The electrode assembly 300 includes a mandrel region 310, and the mandrel region 310 is a hollow region of the electrode assembly 300 and is used to contain an electrolyte. The electrode assembly 300 may include a plurality of positive electrode tabs (not shown) and a plurality of negative electrode tabs 330, the plurality of positive electrode tabs and the plurality of negative electrode tabs 330 being respectively located at opposite ends of the electrode assembly 300. The plurality of negative electrode tabs 330 are all disposed around the central axis of the electrode assembly 300, and are all in a lodged state. The contact area of the negative electrode tab 330 in the lodged state is large, and electrical connection with the negative side end cap assembly 200 is easy to achieve. The plurality of positive electrode tabs are electrically connected to the positive side end cap assembly 200.

In other embodiments, the number of the negative electrode tabs 330 may be one, and the number of the positive electrode tabs and the negative electrode tabs 330 is not particularly limited in the embodiments of the present application.

In the embodiment of the present application, the specific structure of the end cap assembly 200 will be described by taking the end cap assembly 200 on the negative electrode side as an example.

Referring to fig. 4 and 5, fig. 4 is an exploded structure diagram of the end cap assembly 200 of the energy storage device 400 shown in fig. 2, and fig. 5 is a cross-sectional structure diagram of the end cap assembly 200 of the energy storage device 400 shown in fig. 2.

For convenience of description, the height direction of the end cap assembly 200 shown in fig. 4 is defined as a Z-axis direction, the length direction of the extension 82 of the current collecting plate 80 is defined as a Y-axis direction, the width direction of the extension 82 is defined as an X-axis direction, and the X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other.

The end cap assembly 200 includes an end cap 10, an explosion proof valve 20, a protector 21, a pole post 30, a first insulating member 40, a conductive compact 50, a second insulating member 60, a current collecting plate 80, and a seal 90. An explosion protection valve 20 is mounted to the end cap 10 for preventing the energy storage device 400 from exploding during use. The protection member 21 is mounted on the end cover 10, and is used for protecting the explosion-proof valve 20, and preventing the explosion-proof valve 20 from being damaged by external environment and external force. The second insulating member 60 is mounted on one side in the thickness direction (Z-axis direction) of the end cap 10. The conductive compact 50 is located on the side of the end cap 10 facing away from the second insulating member 60. The first insulating member 40 is disposed between the end cap 10 and the conductive compact 50 to insulate the end cap 10 from the conductive compact 50. The pole 30 passes through the second insulating member 60, the end cap 10, the first insulating member 40, and the conductive compact 50 in this order. The sealing member 90 is sleeved on the pole 30 and clamped between the pole 30 and the end cover 10 to insulate the pole 30 from the end cover 10. The current collecting plate 80 is connected to a side of the pole 30 facing away from the second insulating member 60. The collecting tray 80 is isolated and insulated from the end cap 10 by the second insulating member 60.

With continued reference to fig. 4, the end cap 10 is provided with a securing aperture 12, a pressure relief aperture 14 and a mounting slot 15. The fixing hole 12 and the pressure release hole 14 each penetrate the end cap 10 in the thickness direction (Z-axis direction) of the end cap 10. Wherein the fixing hole 12 is located at the middle of the end cap 10. In this embodiment, the fixing hole 12 is a circular hole. The pressure release hole 14 is located at one side of the fixing hole 12 and is spaced apart from the fixing hole 12. The opening of the mounting groove 15 is located at the surface of the end cap 10 facing away from the second insulating member 60. The mounting groove 15 is recessed from the surface of the end cap 10 facing away from the second insulating member 60 toward the surface facing the second insulating portion 60. The mounting groove 15 is provided around the fixing hole 12 and communicates with the fixing hole 12.

The explosion-proof valve 20 is mounted on the end cover 10 and covers the pressure relief hole 14 to block the pressure relief hole 14. Wherein the explosion proof valve 20 covers the opening of the pressure relief hole 14 towards the collecting tray 80. The protector 21 is mounted to the positive end cap 10 and covers the opening of the pressure relief hole 14 facing away from the current collecting tray 80.

The second insulating member 60 is provided with a mounting hole 63 and a through hole 64. The mounting hole 63 and the through hole 64 each penetrate the second insulating member 60 in the thickness direction (Z-axis direction) of the second insulating member 60. Specifically, the mounting hole 63 is located in the middle of the second insulating member 60, opposite to and communicating with the fixing hole 12. The through hole 64 is located on one side of the mounting hole 63 and is spaced apart from the mounting hole 63. Wherein the through hole 64 is provided opposite to the explosion-proof valve 20.

The conductive compact 50 is provided with a connection hole 53, and the connection hole 53 penetrates the conductive compact 50 in the thickness direction (Z-axis direction) of the conductive compact 50. The first insulating member 40 is disposed between the end cap 10 and the conductive compact 50. The first insulating member 40 is provided with a through hole 44. The through hole 44 is located in the middle of the first insulating member 40, penetrates the first insulating portion 40 in the thickness direction (Z-axis direction) of the first insulating member 40, and communicates the fixing hole 12 and the connection hole 53.

Referring now to fig. 6 in combination, fig. 6 is a schematic view of the first insulating member 40 of the end cap assembly 200 of fig. 4 from another perspective.

The first insulating member 40 includes an insulating body 41 and a bump 42, and the bump 42 is fixedly connected to the insulating body 41. In this embodiment, the insulating body 41 and the bump 42 are integrally formed, and are made of insulating materials. Specifically, the bump 42 is protruding from the surface of the insulating body 41 facing the end cap 10. The shape and size of the projection 42 are substantially the same as those of the mounting groove 15. Here, the through hole 44 penetrates the insulating body 41 and the bump 42 in the thickness direction (Z-axis direction) of the first insulating member 40.

Referring to fig. 5, the protrusion 42 of the first insulating member 40 is mounted in the mounting groove 15 of the end cap 10 to increase the contact area between the first insulating member 40 and the end cap 10, increase the connection stability between the first insulating member 40 and the end cap 10, and further increase the assembly stability between the conductive press block 50 and the end cap 10.

The post 30 is sequentially inserted through the mounting hole 63 of the second insulating member 60, the fixing hole 12 of the cap 10, the through hole 44 of the first insulating member 40, and the connection hole 53 of the conductive block 50. The pole 30 includes a cylindrical portion 31 and a carrier portion 33. In the present embodiment, the carrier portion 33 is connected to one end of the column portion 31 in the height direction (Z-axis direction) of the pole 30. In this embodiment, the column portion 31 is substantially cylindrical. The carrier portion 33 has a substantially circular plate shape and protrudes with respect to the peripheral side surface of the column portion 31. One end of the pole 30 is fixed to the connection hole 53 and is exposed to the connection hole 53. The carrier portion 33 abuts against the surface of the second insulating member 60 facing away from the end cap 10.

With continued reference to fig. 4, the sealing member 90 is sleeved on the circumferential side surface of the cylindrical portion 31 in the pole 30, penetrates through the fixing hole 12 of the end cover 10, and is clamped between the pole 30 and the hole wall of the fixing hole 12, so that not only can the end cover 10 and the pole 30 be insulated, but also the installation tightness between the end cover 10 and the pole 30 can be improved, and the tightness of the end cover assembly 200 after assembly is improved. Illustratively, the seal 90 is a seal ring made of an insulating material such as plastic.

Referring to fig. 7 and 8 in combination, fig. 7 is a schematic structural view of the current collecting plate 80 of the end cap assembly 200 shown in fig. 4, and fig. 8 is a schematic structural view of the current collecting plate 80 shown in fig. 7 in an unfolded state. The current collecting plate 80 shown in fig. 7 is in a folded state, and the dotted lines in fig. 8 are only used to illustrate the areas of the respective portions of the current collecting plate 80, and do not represent the actual structure.

The current collecting plate 80 is fixedly attached to the surface of the carrier portion 33 of the post 30 facing away from the second insulating member 60. The collecting tray 80 includes a first tray body 81 and an extension portion 82, and the extension portion 82 is fixedly connected to the first tray body 81. In the embodiment of the present application, the extension 82 and the first disk portion 81 are integrally formed. Compared with the welded extension part 82 and the first disc body 81 in the prior art, the integrally formed extension part 82 and the first disc body 81 save one welding process, improve the production efficiency, and prevent metal burrs or fine scraps generated in the welding process from cutting tabs lodged on the electrode assembly 300 or from entering the electrode assembly 300 to cause short circuit.

In this embodiment, the manifold tray 80 has a collapsed state and an expanded state. As shown in fig. 7, when the collecting tray 80 is in the folded state, the first tray portion 81 and the extension portion 82 are folded relatively. As shown in fig. 8, when the current collecting tray 80 is in the unfolded state, the first tray body 81 and the extension 82 are unfolded relatively, and the first tray body 81 and the extension 82 are flush toward the same surface.

In this embodiment, the first disk 81 has a substantially disk shape. The first disk portion 81 includes a first face 814 and a second face 815, the first face 814 being a surface of the first disk portion 81 facing the second insulating member 60. Along the thickness direction (Z-axis direction) of the first disk portion 81, the second surface 815 is disposed opposite to the first surface 814. The first disk portion 81 is provided with a through hole 811 and a first welding groove 813. The through hole 811 is located in the middle of the first disk portion 81, and penetrates the first disk portion 81 in the thickness direction (Z-axis direction) of the first disk portion 81. Wherein the through hole 811 communicates with the mandrel region 310 (shown in fig. 3) of the electrode assembly 300. The first land 813 is located at one side of the through hole 811 and is spaced apart from the through hole 811. The opening of the first welding groove 813 is located at the first face 814, and the first welding groove 813 is recessed from the first face 814 toward the second face 815. The bottom wall of the first welding groove 813 protrudes with respect to the second face 815 and is used to electrically connect with a tab (shown in fig. 3) in the electrode assembly 300 to electrically connect between the current collecting plate 80 and the electrode assembly 300, thereby electrically connecting the end cap assembly 200 and the electrode assembly 300. Two first bonding grooves 813 are formed, and the two first bonding grooves 813 are located on two opposite sides of the through hole 811 and are spaced from the through hole 811. Illustratively, the first weld groove 813 is formed by a stamping process.

The first tray portion 81 is further provided with a notch 812, and the notch 812 is located at one side of the through hole 811, located between the two first welding grooves 813, and disposed at intervals from both the through hole 811 and the two first welding grooves 813. The notch 812 is provided at the peripheral surface of the first disk portion 81, and penetrates the first disk portion 81 in the thickness direction (Z-axis direction) of the first disk portion 81. The notch 812 results in the formation of a main wall 816 and two opposite side walls 817 on the first tray portion 81, the main wall 816 being connected between the two side walls 817.

Referring to fig. 8 and 9, fig. 9 is a schematic structural diagram of the current collecting plate 80 shown in fig. 8 in another view.

The first disk portion 81 is further provided with a plurality of first reinforcing ribs 818, and the plurality of first reinforcing ribs 818 are located on one side of the through hole 811 facing the notch 812 (Y-axis direction), located between the two first welding grooves 813, and are disposed at intervals from both the notch 812 and the two first welding grooves 813. The plurality of first reinforcing ribs 818 are spaced apart from each other. The strength of the first disk body 81 in the thickness direction (the Z-axis direction) can be enhanced by the plurality of first reinforcing ribs 818, the electrode lugs which are lodged can be abutted, the warping of the electrode lugs is avoided, the contact area between the first disk body 81 and the electrode lugs can be increased, and the current collecting effect of the current collecting disk 80 is improved.

In this embodiment, the first ribs 818 are flush with the end face of the notch 812 (in the Y-axis direction) and coplanar with the main wall 816 of the notch 812 (allowing for a certain error). The plurality of first ribs 818 extend generally along the notch 812 toward the through hole 811. Illustratively, the first reinforcing ribs 818 are formed by a stamping process, with the first reinforcing ribs 818 being recessed from the first face 814 toward the second face 815. In addition, the plurality of first reinforcing ribs 818 are radially distributed, and the distance between two adjacent first reinforcing ribs 818 gradually increases along the direction of the notch 812 toward the through hole 811. The radiation distribution of the plurality of first reinforcing ribs 818 can further increase the contact area of the first disk body 81 and the lugs, improve the current collecting effect, increase the number of the lugs abutted by the plurality of first reinforcing ribs 818, improve the abutting effect and prevent the lugs from warping.

The extension 82 is fixedly connected to the main wall 816 of the notch 812, and is spaced apart from the two side walls 817. The extension 82 includes a bending section 821, a first extension 822, and a second extension 823. The bending section 821 is fixedly connected to the main wall 816 of the notch 812 and is spaced from the two side walls 817. Wherein, the width dimension W of the bending section 821 is more than or equal to 1.5mm and less than or equal to 3mm. The first extension 822 is connected between the bending 821 and the second extension 823. When the collecting tray 80 is in the unfolded state, the extension 82 is in a strip shape, and the bending section 821, the first extension 822 and the second extension 823 are substantially in the same plane.

The first extension 822 is connected to an end of the bending portion 821 away from the first disk 81. The first extension 822 includes a first surface 801 and a second surface 802, the first surface 801 being flush with the first face 814 when the manifold plate 80 is in the expanded state. The second surface 802 is disposed opposite to the first surface 801 in the thickness direction (Z-axis direction) of the first extension 822. The first extension 822 is provided with a plurality of second reinforcing ribs 824, and the plurality of second reinforcing ribs 824 are located at one end of the first extension 822 facing the bending section 821 and are disposed at intervals along the width direction (X-axis direction) of the first extension 822. The plurality of second reinforcing ribs 824 each extend along a length direction (Y-axis direction) of the first extension 822. The plurality of second reinforcing ribs 824 may enhance the strength of the first extension 822 in the thickness direction (Z-axis direction). The exemplary second stiffener 824 is formed by a stamping process. The second ribs 824 are recessed from the first surface 801 toward the second surface 802.

Referring to fig. 7, in the energy storage device 400, the current collecting plate 80 is in a folded state, the bending section 821 bends, the first extending section 822 is spaced from and opposite to the first plate 81 along the thickness direction (Z-axis direction) of the first extending section 822, the portion of the second extending section 823 facing the first extending section 822 bends, and the portion of the second extending section 823 away from the first extending section 822 is spaced from and opposite to the first extending section. At this time, the second reinforcing ribs 824 protrude with respect to the second surface 802. When the energy storage device 400 falls, the electrolyte in the mandrel region 310 can pass through the through hole 811 to impact the first extension 822, and when the electrolyte impacts the second surface 802, the electrolyte can flow back to the electrode assembly 300 along the channel between the adjacent second reinforcing ribs 824, without being stopped on the second surface 802 to cause waste.

In this embodiment, the end surfaces of the second reinforcing ribs 824 facing the first disc 81 are flush, and coplanar with the end surfaces of the bending segments 821 connecting the first extending segments 822 (allowing for a certain error). It will be appreciated that the plurality of second ribs 824 and the plurality of first ribs 818 together define a bending section 821, and that the distance between the end surface of the plurality of second ribs 824 facing the first disk portion 81 and the surface of the plurality of first ribs 818 facing the notch 812 is the width dimension W of the bending section 821.

Referring to fig. 7 and fig. 10 together, fig. 10 is a schematic view of a portion of the energy storage device 400 shown in fig. 2 during an assembly process.

In assembling the energy storage device 400, the electrode assembly 300 is mounted inside the case 100, and then the assembled end cap assembly 200 is coupled to one end of the electrode assembly 300. Specifically, the second extension 823 of the current collecting tray 80 in the unfolded state is welded to the pole 30, and then the bottom wall of the first welding groove 813 is welded to the tab of the electrode assembly 300, so as to realize electrical connection between the end cap assembly 200 and the electrode assembly 300. At this time, the plurality of first ribs 818 of the first disk portion 81 abut against the plurality of tabs, and the through holes 811 of the current collecting disk 80 are disposed opposite to the mandrel region 310 of the electrode assembly 300. The bending of the manifold plate 80 then continues until in the collapsed condition.

As shown in fig. 10, in the embodiment of the present application, since the stress fatigue of the bending section 821 is significantly higher than the first disc portion 81 provided with the first reinforcing rib 818 and the first extending section 822 provided with the second reinforcing rib 824, when the extending portion 82 is bent relative to the first disc portion 81, the crease between the extending portion 82 and the first disc portion 81 must be located in the bending section 821 with higher stress fatigue, and the distribution range of the crease is more determined. Since the width W of the bending portion 821 is 1.5mm or more, it is possible to ensure that the first reinforcing ribs 818 and the second reinforcing ribs 824 do not contact or squeeze each other when the extending portion 82 is bent with respect to the first disk portion 81, thereby avoiding affecting the folding of the collecting tray 80. The width dimension W is smaller than or equal to 3mm, so that the bending section 821 can be ensured to be narrow enough, the crease distribution range between the extension part 82 and the first disc body 81 is ensured to be sufficiently determined, the actual bending direction of the extension part 82 is ensured to be consistent with the preset bending direction, the consistency of the bending direction of the current collecting disc 80 in the assembly process is improved, and the consistency of different energy storage devices 400 when leaving factories is further improved; meanwhile, bending stress generated by first bending of the extension part 82 is also approximately concentrated on the bending section 821, and the first welding groove 813 arranged at intervals with the bending section 821 is not driven to warp upwards, so that the possibility that the first welding groove 813 pulls the tab welded with the first welding groove 813 is reduced, the stability of connection between the current collecting disc 80 and the tab is improved, and the welding stability and the overcurrent effect of the current collecting disc 80 and the tab are ensured.

Referring to fig. 11 to 13, fig. 11 is a schematic structural view of a current collecting plate 80 according to a second embodiment of the present application in an unfolded state, fig. 12 is a schematic structural view of a second plate body 83 according to the second embodiment of the present application, and fig. 13 is a cross-sectional structural view of the current collecting plate 80 shown in fig. 11 along A-A direction.

As shown in fig. 11, the energy storage device 400 of the second embodiment is identical to the energy storage device 400 of the first embodiment in that the collecting tray 80 of the energy storage device 400 of the second embodiment further includes a second tray portion 83. The second disk portion 83 is mounted in the notch 812 of the first disk portion 81, and can form a substantially complete disk together with the first disk portion 81, and the second disk portion 83 is provided at a distance from the extension portion 82.

As shown in fig. 12, the second tray 83 includes a body 830 and two tabs 834, the two tabs 834 being disposed opposite each other at both ends of the body 830. The body 830 is sheet-like, the body 830 including a third face 831 and a fourth face 832. The third surface 831 is oriented in the same direction as the first surface 814, and is disposed opposite the fourth surface 832 in the thickness direction (Z-axis direction) of the body 830. The body 830 is provided with a second welding groove 837. The opening of the second welding groove 837 is located at the third face 831, and the second welding groove 837 is recessed from the third face 831 toward the fourth face 832. The groove bottom wall of the second welding groove 837 protrudes with respect to the fourth surface 832 and is used for electrical connection with a tab (shown in fig. 3) in the electrode assembly 300 to achieve electrical connection between the current collecting plate 80 and the electrode assembly 300, thereby achieving electrical connection between the end cap assembly 200 and the electrode assembly. Illustratively, the second weld recess 837 is formed by a stamping process. The bridge 834 is generally L-shaped and includes a first section 835 and a second section 836. The first section 835 is protruded from the third face 831 of the body 830, the second section 836 is connected to an end of the first section 835 away from the third face 831, and the first section 835 and the second section 836 are disposed at an included angle. The first sections 835 of the two bridge pieces 834 extend in the same direction (Z-axis direction) and the second sections 836 of the two bridge pieces 834 extend opposite (X-axis direction).

With continued reference to fig. 11, the second disc portion 83 overlaps the first disc portion 81 by two overlap members 834. The first section 835 of the bridge 834 is disposed opposite the sidewall of the gap 812, and the surface of the second section 836 facing the third face 831 overlaps the first face 814 of the first disk portion 81. The body 830 of the second tray portion 83 is located on a side of the first extension 822 facing away from the first surface 801, the body 830 and the extension 82 are opposite and spaced apart in the thickness direction (Z-axis direction) of the current collecting tray 80, and the bridge 834 is spaced apart from the extension 82 in the width direction (X-axis direction) of the extension 82.

Referring to fig. 13 in combination, the body 830 protrudes from the first tray 81 by a distance D of 0.2mm or more and 0.8mm or less. The distance D is a distance between the fourth face 832 of the second tray portion 83 and the second face 815 of the first tray portion 81. The protruding body 830 of the first tray 81 can limit the movement space of the negative electrode tab 330 located at the notch 812 in the height direction (Z-axis direction) of the electrode assembly 300, and prevent the negative electrode tab 330 corresponding to the notch 812 from warping, and even from being turned outwards to overlap the inner wall of the case 100 through the notch 812 to form a short circuit.

In the process of assembling the energy storage device 400, after the bottom wall of the first welding groove 813 of the first disk portion 81 is welded with the tab of the electrode assembly 300, the second disk portion 83 is mounted on the notch 812 of the first disk portion 81, the second disk portion 83 is lapped with the first disk portion 81 through two lap joint pieces 834, and then the bottom wall of the second welding groove 837 is welded with the tab corresponding to the notch 812, so that the second disk portion 83 is fixedly connected with the tab, and the second disk portion 83 is electrically connected with the first disk portion 81 through lap joint. The contact area between the current collecting disc 80 and the electrode lugs is increased by the arrangement of the second disc body 83, the current collecting effect of current is improved, the uniformity of the current collected by the current collecting disc 80 in the electrode assembly 300 is improved, and the consistency of delivery among different energy storage devices 400 is improved.

Referring to fig. 14, fig. 14 is a schematic view of a portion of an energy storage device 400 in a partially bent state according to a second embodiment of the present disclosure.

In this embodiment, when the extension portion 82 bends relative to the first disc portion 81, since the second disc portion 83 is only overlapped with the first disc portion 81 by the overlap joint member 834, the bending stress near the bending section 821 will not affect the second disc portion 83, and the second welding slot 837 will not be driven to tilt up, so that the possibility that the second welding slot 837 pulls the negative electrode tab 330 located at the notch 812 is reduced. Therefore, the second disk body portion 83 and the tab welding, the first disk body portion 81 and the tab welding scheme adopted by the application improve the stability of connection between the second disk body portion 83 and the tab, and further guarantee the welding effect and the overcurrent effect of the current collecting disk 80 and the tab.

The embodiment of the application provides an integrated into one piece's current collecting plate 80, has avoided the influence of welding process to electrode assembly 300, and the section 821 of buckling is defined through setting up first strengthening rib 818 and second strengthening rib 824 simultaneously, makes the current collecting plate concentrate in the section 821 of buckling at the bending stress when bending, has avoided driving first welding groove 813 and has pulled the utmost point ear, has promoted the connection stability of current collecting plate 80 and utmost point ear. Further, in the embodiment of the application, the second disc body 83 is further welded with the tab, so that the contact area between the current collecting disc 80 and the tab is further enlarged, and the uniformity of the current collected by the current collecting disc 80 in the electrode assembly 300 is improved.

The foregoing disclosure is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the claims hereof, as it is to be understood by those skilled in the art that all or part of the procedures described herein may be performed and that equivalent changes may be made thereto without departing from the scope of the claims.

Claims

1. The utility model provides a current collection dish (80), its characterized in that, current collection dish (80) include first disk body (81) and extension (82), extension (82) with first disk body (81) fixed connection, just extension (82) with first disk body (81) integrated into one piece.

2. The collecting tray (80) according to claim 1, wherein the first tray body (81) comprises a first face (814), a second face (815) and a peripheral face, the first face (814) and the second face (815) being disposed opposite each other in a thickness direction of the first tray body (81), the peripheral face being connected between the first face (814) and the second face (815), the first tray body (81) being provided with a notch (812), the notch (812) being provided at the peripheral face of the first tray body (81) and penetrating the first face (814) and the second face (815), the notch (812) resulting in the formation of one main wall face (816) and two side wall faces (817) on the first tray body (81), the two side wall faces (817) being connected to opposite sides of the main wall face (816);

the extension portion (82) is fixedly connected to the main wall surface (816) and is arranged at intervals from two side wall surfaces (817).

3. The collector plate (80) of claim 2, wherein the extension (82) includes a bent segment (821) and a first extension (822), the bent segment (821) being connected between the main wall (816) and the first extension (822), the bent segment (821) having a stress fatigue greater than that of the first plate body (81) and the first extension (822);

the collecting tray (80) has a folded state and an unfolded state, when the collecting tray (80) is in the folded state, the extension part (82) is folded relative to the first tray body (81), the bending section (821) is bent, and the first extension section (822) is spaced from and arranged opposite to the first tray body (81); when the collecting tray (80) is in the unfolding state, the extension portion (82) is unfolded relative to the first tray body (81) and the first extension section (822), and the extension portion (82) and the first tray body (81) are in the same plane.

4. A collecting tray (80) according to claim 3, wherein the width dimension W of said bending section (821) is greater than or equal to 1.5mm and less than or equal to 3mm.

5. A collecting tray (80) according to claim 3, wherein said second face (815) is provided with a plurality of first ribs (818), said plurality of first ribs (818) being located adjacent to said notch (812) of said first tray body (81) and spaced apart from each other and extending in a direction of said first tray body (81) towards said bending section (821);

the first extending section (822) is provided with a plurality of second reinforcing ribs (824), and the plurality of second reinforcing ribs (824) are located at one end of the first extending section (822) facing the bending section (821) and are arranged at intervals, and extend along the direction from the first extending section (822) to the bending section (821).

6. The collecting tray (80) according to claim 5, wherein a plurality of said first ribs (818) are flush towards an end face of said bending section (821) and coplanar with an end face of said bending section (821) connecting said first tray body (81); the second reinforcing ribs (824) are flush with the end face of the bending section (821) and coplanar with the end face of the bending section (821) connected with the first extension section (822).

7. The current collecting plate (80) according to claim 5, wherein the first extension (822) comprises a first surface (801) and a second surface (802), the first surface (801) and the second surface (802) being disposed opposite each other in a thickness direction of the first extension (822); -the second ribs (824) are protruding with respect to the second surface (802);

when the collecting tray (80) is in the folded state, the first surface (801) is opposite to the first surface (814), and the second surface (802) is opposite to the second surface (815).

8. The collecting tray (80) according to claim 5, wherein a distance between adjacent two of said first reinforcing ribs (818) becomes gradually larger in a direction from said notch (812) toward a center of said first tray body (81).

9. The current collecting plate (80) according to any of claims 3-8, wherein the extension (82) further comprises the second extension (823), the second extension (823) being connected to an end of the first extension (822) remote from the bending section (821);

when the collecting tray (80) is in the folded state, the second extension section (823) bends towards the part of the first extension section (822), and the part of the second extension section (823) away from the first extension section (822) is spaced from and arranged opposite to the first extension section (822).

10. The collecting tray (80) according to claim 2, wherein a first welding groove (813) is provided on the first face (814) of the first tray body (81), and a groove bottom wall of the first welding groove (813) protrudes with respect to the second face (815).

11. A collecting tray (80) according to claim 3, wherein the collecting tray (80) further comprises a second tray body (83), the second tray body (83) being mounted in the gap (812) and overlapping the first tray body (81); the second tray body (83) is arranged at intervals from the extension portion (82).

12. The collecting tray (80) according to claim 11, wherein the second tray body (83) comprises a body (830) and two tabs (834), the two tabs (834) being disposed opposite each other at both ends of the body (830) and each overlapping the first tray body (81);

the body (830) is relative first disk body portion (81) protrusion, body (830) are equipped with second welding groove (837), current collection dish (80) are in when expanding the state, body (830) are located one side in extension (82) thickness direction, and with extension (82) interval sets up, the tank bottom wall of second welding groove (837) is relative body (830) deviates from the surface protrusion of extension (82).

13. The collecting tray (80) according to claim 12, wherein the distance D by which the body (830) protrudes from the first tray body (81) is 0.2mm or more and 0.8mm or less.

14. An end cap assembly (200) comprising an end cap (10) and a collector plate (80) according to any of claims 1-13, said collector plate (80) being mounted to one side of said end cap (10) in the thickness direction.

15. The energy storage device (400) is characterized by comprising a shell (100), an electrode assembly (300) and the end cover assembly (200) according to claim 14, wherein the shell (100) is provided with an opening, the shell (100) is provided with a containing cavity, the electrode assembly (300) is contained in the containing cavity, the end cover assembly (200) is mounted at the opening at one end of the shell (100), and the current collecting disc (80) is electrically connected with the electrode assembly (300).

16. A powered device, the powered device comprising the energy storage device (400) of claim 15, the energy storage device (400) powering the powered device.