CN116315481A - Energy storage device and electric equipment - Google Patents

Abstract

The application provides an energy memory and consumer, energy memory includes electrode assembly and current collecting disc, the current collecting disc includes disk body portion and extension, disk body portion is connected with the electrode assembly electricity, disk body portion is equipped with the through-hole, the through-hole runs through disk body portion along the thickness direction of disk body portion, the through-hole is located the center of disk body portion, extension and disk body portion fixed connection, and include with disk body portion interval and the relative middle extension that sets up, middle extension includes towards the first surface of disk body portion and the side of being connected with first surface, middle extension is equipped with at least one guiding gutter, the opening of guiding gutter is located first surface, the guiding gutter runs through the side. The energy storage device formed by using the current collecting disc can carry out secondary distribution on electrolyte in the use process of the energy storage device, and the problem that the performance of the energy storage device is affected due to uneven distribution of the electrolyte in the energy storage device is solved.

Description

Energy storage device and electric equipment

Technical Field

The application relates to the technical field of energy storage devices, in particular to an energy storage device and electric equipment.

Background

When the energy storage device such as the secondary battery is charged and discharged in a circulating way or stored for a long time, electrolyte in the energy storage device can be gradually decomposed and gas is generated, so that the problem of uneven distribution of the electrolyte in the energy storage device is caused, and the performance of the energy storage device is affected, for example, the problem of lithium precipitation of the energy storage device caused by uneven distribution of the electrolyte is solved.

Disclosure of Invention

The utility model aims at providing an energy storage device and consumer, this energy storage device can carry out the secondary distribution to electrolyte in the use, has solved the inhomogeneous problem that causes that influences energy storage device performance of electrolyte distribution among the energy storage device.

An energy storage device comprises an electrode assembly and a current collecting disc, wherein the current collecting disc comprises a disc body part and an extension part, the disc body part is electrically connected with the electrode assembly, the disc body part is provided with a through hole, the through hole penetrates through the disc body part along the thickness direction of the disc body part, the through hole is positioned at the center of the disc body part,

the extension portion is fixedly connected with the disc body portion, and comprises a middle extension section which is arranged at intervals with the disc body portion and is opposite to the disc body portion, the middle extension section comprises a first surface facing the disc body portion and a side surface connected with the first surface, the middle extension section is provided with at least one diversion trench, an opening of the diversion trench is positioned on the first surface, and the diversion trench penetrates through the side surface.

During actual use of the energy storage device, such as during transportation, electrolyte in the energy storage device can impact from the electrode assembly towards the current collecting disc due to vibration. The embodiment of the application provides an energy storage device, through set up the middle extension section that sets up relatively with disk body portion at the mass flow dish, and set up the guiding gutter towards the first surface of disk body portion at the middle extension section, can make the electrolyte in the energy storage device can strike the first surface towards disk body portion to the middle extension section through the through-hole of disk body portion, this part electrolyte can flow under the guide of guiding gutter, and fall back to disk body portion, in order to realize utilizing disk body portion to carry out secondary distribution to the electrolyte that falls back, thereby do benefit to the inhomogeneous problem of electrolyte distribution that solves energy storage device and appear, and then do benefit to the performance of guaranteeing energy storage device, avoid energy storage device to take place the lithium problem of separating.

In one possible embodiment, at least a portion of the first surface is disposed opposite the through hole, so that the electrolyte passing through the through hole impinges on the first surface and flows along the first surface to the diversion trench, thereby facilitating diversion of the electrolyte.

In one possible implementation, at least a portion of the diversion trench and the through hole are disposed opposite to each other along the axial direction of the collecting tray, so that the electrolyte passing through the through hole can directly impact into the diversion trench, thereby facilitating diversion of the electrolyte by the diversion trench.

In one possible embodiment, the side surface comprises a first face and a second face, the first face and the second face being arranged opposite each other in the width direction of the intermediate extension;

the middle extension section is provided with a plurality of guiding gutters, and a plurality of guiding gutters include at least one first groove and at least one second groove, and first groove and second groove interval set up, and first groove runs through first face, and the second groove runs through the second face. Through setting up first groove and second groove to realize guiding the electrolyte to flow to the opposite both sides of width direction from the centre of middle extension section, promoted the efficiency that the guide electrolyte flowed, can also evenly disperse the electrolyte simultaneously.

In one possible embodiment, the angle between the length direction of the diversion trench and the extending direction of the middle extension section is alpha, and alpha is an obtuse angle or an acute angle, so that the extending length of the diversion trench can be increased, thereby being beneficial to increasing the flow rate of the electrolyte guided by the diversion trench.

In one possible embodiment, the middle extension section further comprises a second surface, wherein the second surface is arranged opposite to the first surface and is connected with the side surface, and the groove bottom wall of the diversion trench protrudes opposite to the second surface;

the middle extension section is provided with a plurality of diversion trenches, the diversion trenches are arranged at intervals along the extension direction of the middle extension section, and diversion flow passages are formed between the tank bottom walls of two adjacent diversion trenches. The bottom walls of the diversion trenches are protruded relative to the second surface, so that diversion channels can be formed between the bottom walls of two adjacent diversion trenches, and the diversion channels are beneficial to guiding the flow of electrolyte.

In one possible embodiment, the extension includes a first extension, an intermediate extension, and a second extension, the first extension being fixedly connected to the tray portion, the intermediate extension being connected between the first extension and the second extension.

In one possible implementation manner, the tray body is further provided with a plurality of first communication holes, the plurality of first communication holes penetrate through the tray body along the thickness direction of the tray body, the plurality of first communication holes are arranged at intervals, and are arranged at intervals with the through holes, the sum of the areas of the plurality of first communication holes is S1, and the area of the through holes is S2, wherein S1 is greater than S2. Through set up first communication hole and through-hole at the disk body portion of mass flow dish for energy storage device is in the transportation, strikes the middle extension and at guiding gutter guide whereabouts electrolyte to disk body portion, can pass first communication hole and through-hole and carry out secondary distribution. In the process of secondary distribution of the electrolyte, since the total area S1 of the first communication holes is larger than the area S2 of the through holes, the flow rate of the electrolyte falling back through the first communication holes is larger than that of the electrolyte falling back through the through holes, so that the content of the electrolyte falling back to the position, far away from the central axis, of the electrode assembly is larger than that of the electrolyte falling back to the central axis of the electrode assembly, and the content of the electrolyte falling back to the position, far away from the central axis, of the electrode assembly is guaranteed, and the performance of the energy storage device is guaranteed.

In one possible embodiment, 21% or less S2/S1 or less 52% can ensure that the electrode assembly has a sufficient electrolyte content to be consumed at both the central spindle and the peripheral position of the electrode assembly away from the spindle.

In one possible embodiment, the tray body is further provided with a plurality of second communication holes, each of the plurality of second communication holes penetrates the tray body along the thickness direction of the tray body, the plurality of second communication holes are arranged at intervals, each of the plurality of second communication holes is arranged at intervals with the through hole and the plurality of first communication holes, and the plurality of second communication holes and the plurality of first communication holes are respectively located at two sides of the through hole. Through set up first communication hole and second intercommunicating pore simultaneously in the both sides of through-hole for the electrolyte that falls back can be distributed to the circumference side position department of keeping away from the dabber both sides of electrode assembly, does benefit to evenly distributed electrolyte.

In one possible embodiment, the sum of the areas of the plurality of second communication holes is S3, S3 > S2, so that the flow rate of the electrolyte falling back through the second communication holes is greater than the flow rate of the electrolyte falling back through the through holes, to achieve secondary distribution of the electrolyte, and simultaneously ensure that the flow rate of the electrolyte falling back to the peripheral position of the electrode assembly is greater than the flow rate of the electrolyte falling back to the central position of the electrode assembly in the secondary distribution process, thereby ensuring the content of the electrolyte at the peripheral position of the electrode assembly far away from the mandrel, and further ensuring the performance of the energy storage device.

In one possible embodiment, 21% S2/S3% S52% can ensure that the electrode assembly has a sufficient electrolyte consumption at both the central spindle and the peripheral position of the electrode assembly away from the spindle.

In one possible embodiment, s1=s3, so that the fallen electrolyte can be uniformly distributed to the circumferential positions of the electrode assembly, which are far from both sides of the mandrel, to avoid the occurrence of the lithium precipitation phenomenon.

In one possible embodiment, the electrode assembly has a mandrel, the mandrel of the electrode assembly being disposed opposite the through hole.

The embodiment of the application also provides electric equipment, which comprises the energy storage device, wherein the energy storage device supplies power for the electric equipment.

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 device provided in an embodiment of the present application applied to an energy storage system;

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

FIG. 3 is an exploded view of the end cap assembly of the energy storage device of FIG. 2;

FIG. 4 is a schematic view of the first insulating member of the end cap assembly of FIG. 3 from another perspective;

FIG. 5 is a schematic view of the manifold disk of the end cap assembly of FIG. 3 in an expanded configuration;

fig. 6 is a schematic view of the structure of the middle extension of the collecting tray shown in fig. 5;

fig. 7 is a schematic view of the current collecting tray of fig. 5 in a folded state;

FIG. 8 is a schematic view of a partial cross-sectional structure of the end cap assembly of FIG. 3;

fig. 9 is a schematic structural view of a current collecting disc in an expanded state in an energy storage device according to a second embodiment of the present application;

fig. 10 is a schematic structural view of a current collecting tray in a folded state in the energy storage device according to the third embodiment of the present application.

Reference numerals: 1. an electric energy conversion device; 2. user load; 1000. an energy storage device; 100. a housing; 200. an end cap assembly; 10. an end cap; 12. a fixing hole; 14. a pressure relief hole; 15. a mounting groove; 20. an explosion-proof valve; 21. a protective member; 30. a pole; 31. a column portion; 32. a protruding portion; 33. a carrier portion; 40. a first insulating member; 41. an insulating body; 42. a bump; 43. a caulking groove; 44. a through hole; 50. a conductive compact; 53. a connection hole; 60. a second insulating member; 63. a mounting hole; 64. a through hole; 80. a collecting tray; 81. a tray body; 811. a through hole; 812. a first communication hole; 813. a welding groove; 814. a second communication hole; 82. an extension; 821. a first extension; 822. a middle extension section; 823. a second extension; 801. a first surface; 802. a second surface; 803. a side surface; 803a, a first face; 803b, a second face; 83. a diversion trench; 831. a first groove; 831a, a first sidewall; 831b, a second sidewall; 831c, third side wall; 832. a second groove; 832a, a fourth side wall; 832b, fifth side wall; 832c, sixth side wall; 833. a first notch; 834. a second notch; 84. a fixing groove; 86. a diversion flow passage; 90. and a seal.

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, embodiments of the present application provide an energy storage device. The energy storage device is internally provided with a group of chemical batteries, chemical elements in the chemical batteries are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media, namely, the electric energy generated by wind energy and solar energy is 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 use.

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 device 1000 applied to an energy storage system according to an embodiment of the present application.

As shown in fig. 1, the embodiment of the present application is illustrated by taking a household energy storage scenario in the user side energy storage as an example, but it should be understood that the energy storage system provided in the present application is not limited to the household energy storage scenario. In this embodiment, the energy storage system may be a household storage system. The energy storage system comprises an electrical energy conversion device 1, a consumer load 2 and an energy storage device 1000. The energy storage device 1000 is a small-sized energy storage box, and can be installed on an outdoor wall in a wall-hanging manner. The electrical energy conversion device 1 may be a photovoltaic panel, for example. The power conversion device 1 can convert solar energy into electric energy at the electricity price off-peak period. The energy storage device 1000 is used for storing the electric energy and supplying the electric energy to the consumer load 2 such as a street lamp and a household appliance at the time of peak of electricity price or supplying the electric energy at the time of power failure/power failure of the electric network. In this embodiment, the energy storage device 1000 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 1000 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 1000 according to a first embodiment of the present disclosure.

In this embodiment, the energy storage device 1000 is a cylindrical lithium-ion battery. Wherein the length and width of the energy storage device 1000 are approximately equal. The energy storage device 1000 includes a case 100, an electrode assembly (not shown in fig. 2), and two end cap assemblies 200. The housing 100 is a cylindrical housing. The case 100 has an opening, and the electrode assembly is mounted at the inside of the case 100. Along the Z-axis direction, two end cap assemblies 200 are respectively mounted on opposite sides of the case 100, close the opening 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. Illustratively, the positive electrode sheet, separator, and negative electrode sheet are sequentially stacked and wound to form an electrode assembly. The middle part of the wound electrode assembly forms a mandrel which is hollow and can contain electrolyte. The tab of the positive plate is a positive tab, and the tab of the negative plate is a negative tab.

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 assemblies fixedly connected to the two end cap assemblies 200 are placed in the case 100, and the end caps of the two end cap assemblies 200 are respectively fixedly connected to the case 100, and then the electrolyte is injected from the end cap assemblies 200 on the positive electrode side, so as to assemble and form the energy storage device 1000. The electrode assembly is immersed in the electrolyte, and an electrochemical reaction can occur between the electrode assembly and the electrolyte, and chemical energy is converted into electric energy, so that the energy storage device 1000 can output electric energy.

In the present embodiment, the end cap assembly 200 is illustrated as a negative side end cap assembly. Referring specifically to fig. 3, fig. 3 is a schematic diagram illustrating an exploded structure of the end cap assembly 200 of the energy storage device 1000 shown in fig. 2.

The end cap assembly 200 includes an end cap 10, an explosion proof valve 20, a protector 21, a pole 30, a first insulating member 40, a conductive compact 50, a second insulating member 60, and a current collecting plate 80. An explosion protection valve 20 is mounted to the end cap 10 for preventing the energy storage device 1000 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 pole 30 is inserted into the end cap 10 and protrudes in the positive Z-axis direction relative to the end cap 10. The first insulating member 40 is installed at a side of the end cap 10 facing away from the positive direction of the Z-axis and between the end cap 10 and the pole 30 to insulate the end cap 10 from the pole 30. The conductive pressing block 50 is mounted on a side of the first insulating member 40 facing away from the end cap 10, and is sleeved on a circumferential side surface of the pole 30, and is used for pressing and fixing the pole 30. The second insulating member 60 is installed at one side of the end cap 10 facing the negative Z-axis direction and between the end cap 10 and the current collecting plate 80 to insulate the end cap 10 from the current collecting plate 80. The current collecting plate 80 is mounted to a side of the second insulating member 60 facing away from the end cap 10 and is electrically connected to the pole 30.

When the energy storage device 1000 is assembled, the current collecting disc 80 in the end cover assembly 200 and the negative electrode tab in the electrode assembly are welded and fixed to realize electrical connection between the end cover assembly 200 and the electrode assembly.

With continued reference to fig. 3, 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 penetrate through the end cap 10 in the thickness direction of the end cap 10, i.e., in the Z-axis direction. Wherein the fixing hole 12 is located at the center of the end cap 10. In this embodiment, the fixing hole 12 is a circular hole. The pressure relief hole 14 is spaced from the fixing hole 12. The mounting groove 15 opens in the positive Z-axis direction, and is recessed from the surface of the cap 10 in the positive Z-axis direction toward the surface in the negative Z-axis direction. The mounting groove 15 is provided around the fixing hole 12 and communicates with the fixing hole 12.

The explosion-proof valve 20 is installed on the positive end cap 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 protection piece 21 is installed on the positive end cover 10 and covers the opening of the pressure relief hole 14, which is away from the current collecting disc 80, so as to protect the explosion-proof valve 20 and prevent the explosion-proof valve 20 from being damaged by external environment and external force.

The post 30 includes a cylindrical portion 31, a protruding portion 32, and a carrier portion 33. In the present embodiment, the height direction of the pole 30 is the Z-axis direction, and the protruding portion 32 and the mount portion 33 are connected to opposite ends of the column portion 31 in the height direction. In this embodiment, the column portion 31 is substantially cylindrical. The protruding portion 32 protrudes with respect to the peripheral side face of the column portion 31. The carrier portion 33 has a substantially circular plate shape and protrudes with respect to the peripheral side surface of the column portion 31.

Referring now to fig. 4 in combination, fig. 4 is a schematic view of the first insulating member 40 of the end cap assembly 200 of fig. 3 from another perspective. The first insulating member 40 includes an insulating body 41 and a bump 42, and the bump 42 is protruded from the surface of the insulating body 41. 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. In this embodiment, the insulating body 41 and the bump 42 are integrally formed, and are made of insulating materials.

Further, the first insulating member 40 is provided with a caulking groove 43 and a through hole 44. The thickness direction of the first insulating member 40 is a Z-axis direction. The opening of the caulking groove 43 is located on the surface of the insulating body 41 facing away from the end cap 10. The caulking groove 43 is recessed from the surface of the insulating body 41 facing away from the end cap 10 toward the surface facing the end cap 10. The opening of the through hole 44 is provided in the bottom wall of the insertion groove 43, and the through hole 44 penetrates the insulating body 41 and the bump 42 in the thickness direction of the first insulating member 40.

With continued reference to fig. 3, the conductive compact 50 is shaped and sized substantially the same as the shape and size of the caulking groove 43. 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 of the conductive compact 50.

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 of the second insulating member 60. The second insulating member 60 is substantially circular, and the mounting hole 63 is located at the center of the second insulating member 60, and the through hole 64 is provided at a distance from the mounting hole 63.

Referring now to fig. 5 in combination, fig. 5 is a schematic illustration of the structure of the manifold plate 80 of the end cap assembly 200 of fig. 3 in an expanded configuration. The dashed lines in fig. 5 are only used to illustrate the areas of the respective portions of the extension 82, and do not represent the actual structure.

The current collecting plate 80 includes a plate body 81 and an extension 82, and the extension 82 is fixedly connected to the plate body 81. In this embodiment, the disk portion 81 is substantially disk-shaped, the extension portion 82 is substantially elongated, and the extension portion 82 and the disk portion 81 are welded.

The tray body 81 is provided with a through hole 811, a plurality of first communication holes 812, and a solder groove 813. The through hole 811 and the plurality of first communication holes 812 each penetrate the disk body 81 in the thickness direction of the disk body 81. Specifically, the through hole 811 is located at the center of the disk body 81. The plurality of first communication holes 812 are provided at intervals from each other, are located at one side of the through hole 811, and are each provided at intervals from the through hole 811. The area of the first communication holes 812 is S1, and the area of the through holes 811 is S2, S1 > S2. In some embodiments, 21% S2/S1% S52%. In this application, the "area" of a hole refers to the cross-sectional area of the hole, e.g., the area of the through hole 811 refers to the cross-sectional area of the through hole 811.

The opening of the welding groove 813 is located at the surface of the tray portion 81 facing the end cap 10, and the welding groove 813 is recessed from the surface of the tray portion 81 facing the end cap 10 in a direction away from the surface of the end cap 10. The bottom wall of the welding groove 813 protrudes with respect to the surface of the disk portion 81 facing away from the end cap 10 and is used for electrical connection with the negative electrode tab in the electrode assembly to achieve electrical connection between the current collecting disk 80 and the electrode assembly, thereby achieving electrical connection between the end cap assembly 200 and the electrode assembly. Illustratively, there are two bond grooves 813, with two bond grooves 813 on opposite sides of the via 811, respectively, and each spaced from the via 811.

The extension 82 is elongated. The extension 82 includes a first extension 821, an intermediate extension 822, and a second extension 823. The first extension 821 is fixedly connected with the disk portion 81 to achieve a fixed connection between the extension 82 and the disk portion 81. The intermediate extension 822 is connected between the first extension 821 and the second extension 823. In this embodiment, the first extension 821, the intermediate extension 822, and the second extension 823 are integrally formed.

Referring to fig. 6 in combination, fig. 6 is a schematic view of the middle extension 822 of the current collecting plate 80 shown in fig. 5. Wherein intermediate extension 822 comprises a first surface 801, a second surface 802, and sides 803. Specifically, the first surface 801 and the second surface 802 are disposed opposite to each other in the thickness direction of the intermediate extension 822, that is, opposite to each other in the Z-axis direction. Side 803 is connected between first surface 801 and second surface 802. Specifically, the side 803 includes a first face 803a and a second face 803b, and the first face 803a and the second face 803b are disposed opposite to each other in the width direction of the intermediate extension 822 and are connected between the first surface 801 and the second surface 802.

The collecting tray 80 is also provided with a flow guide groove 83. The opening of the flow guide groove 83 is provided on the first surface 801 of the middle extension 822. The diversion trench 83 is recessed from the first surface 801 toward the second surface 802, penetrates the side 803, and can be used to guide the flow of the electrolyte. For example, the plurality of flow guiding grooves 83 may be plural, and the plurality of flow guiding grooves 83 are disposed at intervals along the extending direction of the middle extending section 822. In this embodiment, the groove bottom walls of the diversion grooves 83 protrude relative to the second surface 802, and a diversion channel 86 is formed between the groove bottom walls of two adjacent diversion grooves 83, and the diversion channel 86 is used for guiding the flow of the electrolyte. For example, the flow guide grooves 83 may be formed by a stamping process.

The included angle between the length direction of the diversion trench 83 and the extending direction of the middle extending section 822 is alpha, and alpha is an obtuse angle or an acute angle, so that the extending length of the diversion trench 83 can be increased, thereby being beneficial to increasing the flow rate of the electrolyte guided by the diversion trench 83. Illustratively, α is an obtuse angle as shown in FIG. 4, and in other embodiments α may be an acute angle.

In this embodiment, the plurality of diversion trenches 83 includes at least one first trench 831 and at least one second trench 832, and the plurality of first trenches 831 and the plurality of second trenches 832 are spaced apart. The plurality of first grooves 831 and the plurality of second grooves 832 are each disposed at intervals along the extending direction of the intermediate extension 822. In this embodiment, the number of the first grooves 831 and the second grooves 832 is three. In other embodiments, the number of the first grooves 831 and the second grooves 832 may be one, two, four, etc., and the embodiments of the present application do not limit the number of the first grooves 831 and the second grooves 832. The number of the first grooves 831 and the second grooves 832 may be equal or unequal.

Wherein the first grooves 831 penetrate the first face 803a. The first recess 831 includes a first notch 833 located on the first side 803a. Specifically, the groove sidewalls of the first groove 831 include a first sidewall 831a, a second sidewall 831b, and a third sidewall 831c. The first and second sidewalls 831a and 831b are oppositely disposed in the width direction of the first groove 831. The third sidewall 831c is connected between the first sidewall 831a and the second sidewall 831b, and is disposed opposite to the first notch 833. The electrolyte within the first tank 831 may flow toward the first notch 833 in the length direction of the first tank 831 (i.e., in the direction of the third side wall 831c toward the first notch 833) and flow out of the first notch 833.

In this embodiment, the angle between the length direction of the first groove 831 and the extending direction of the middle extending section 822 is α1, and α1 is an obtuse angle, so that the extending length of the first groove 831 can be increased, thereby facilitating to increase the flow rate of the electrolyte guided by the first groove 831.

A second slot 832 extends through second face 803b. Second slot 832 includes a second notch 834 located on second face 803b. Specifically, the slot sidewalls of the second slot 832 include a fourth sidewall 832a, a fifth sidewall 832b, and a sixth sidewall 832c. The fourth side wall 832a and the fifth side wall 832b are disposed opposite to each other in the width direction of the second groove 832. The sixth side wall 832c is connected between the fourth side wall 832a and the fifth side wall 832b and disposed opposite to the second notch 834. The electrolyte in the second tank 832 may flow toward the second gap 834 along the length direction of the second tank 832 (i.e., the direction from the fifth side wall 832b toward the second gap 834) and out of the second gap 834.

In the present embodiment, the included angle between the length direction of the second groove 832 and the extending direction of the middle extending section 822 is α2, and α2 is an obtuse angle, so that the extending length of the second groove 832 can be increased, thereby facilitating to increase the flow rate of the electrolyte guided by the second groove 832. In this embodiment, the second grooves 832 are symmetrically disposed with the first grooves 831. The embodiment of the application improves the efficiency of guiding the flow of the electrolyte and simultaneously can uniformly disperse the electrolyte by arranging the first tank 831 and the second tank 832 to realize the flow of the guided electrolyte from the middle of the middle extension section 822 to the opposite sides of the width direction.

With continued reference to fig. 5, the manifold plate 80 is also provided with a retaining slot 84. The fixing groove 84 is provided in the second extension 823, and penetrates the second extension 823 in the thickness direction of the second extension 823.

Referring to fig. 5 and 7 in combination, fig. 7 is a schematic view of the current collecting plate 80 shown in fig. 5 in a folded state.

The manifold tray 80 has an expanded state and a collapsed state. When the current collecting plate 80 is in the unfolded state, the surface of the plate body 81 is substantially parallel to the surface of the extension 82, and the first extension 821, the middle extension 822 and the second extension 823 of the extension 82 are substantially in the same plane.

When the current collecting plate 80 is in the folded state, the first extension 821 is folded toward a portion of the intermediate extension 822, the second extension 823 is folded toward a portion of the intermediate extension 822, and the intermediate extension 822 is spaced apart from and disposed opposite to the plate body 81. Wherein the first surface 801 of the intermediate extension 822 faces towards the disc portion 81, i.e. the opening of the flow guiding groove 83 faces towards the disc portion 81, and the second surface 802 faces away from the disc portion 81. In this embodiment, at least part of the first surface 801 is disposed opposite to the through hole 811, so that the electrolyte passing through the through hole 811 is impacted onto the first surface 801 and flows along the first surface 801 to the diversion trench 83, thereby facilitating diversion of the electrolyte. At least a part of the diversion trench 83 and the through hole 811 are oppositely arranged along the axial direction of the flow collecting disc 80, so that the electrolyte passing through the through hole 811 can directly impact into the diversion trench 83, and the diversion trench 83 is used for diversion of the electrolyte.

With continued reference to FIG. 3, in this embodiment, the end cap assembly 200 further includes a seal 90. Specifically, the sealing member 90 is sleeved on the circumferential side surface of the pole 30 and is clamped between the end cover 10 and the pole 30, so that not only can the end cover and the pole 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. In this embodiment, the sealing member 90 is a sealing ring.

Referring to fig. 3 and 8 in combination, fig. 8 is a schematic view of a partial cross-sectional structure of the end cap assembly 200 of fig. 3.

In the assembled end cap assembly 200, the explosion protection valve 20 is mounted to the end cap 10 and covers the pressure relief hole 14. The protrusion 42 of the first insulating member 40 is mounted in the mounting groove 15 of the end cap 10, and the conductive compact 50 is mounted in the insertion groove 43 of the first insulating member 40, so that the first insulating member 40 and the conductive compact 50 are stacked and mounted on one side of the end cap 10 in the thickness direction. At this time, the connection hole 53 of the conductive compact 50, the through hole 44 of the first insulating member 40, and the fixing hole 12 of the cap 10 communicate. The second insulating member 60 is mounted to the side of the end cap 10 facing away from the first insulating member 40. The collecting tray 80 is mounted to the side of the second insulating member 60 facing away from the end cap 10. At this time, the mounting hole 63 of the second insulating member 60, the fixing hole 12 of the end cap 10, and the fixing groove 84 of the second extension 823 in the current collecting plate 80 communicate. The through hole 64 of the second insulating member 60 communicates with the pressure release hole 14 of the end cap 10.

The post 30 is sequentially inserted into the connection hole 53 of the conductive block 50, the through hole 44 of the first insulating member 40, the fixing hole 12 of the end cap 10, the mounting hole 63 of the second insulating member 60, and the fixing groove 84 of the current collecting plate 80. The protruding portion 32 of the pole 30 abuts against and is fixed to the inner wall of the connecting hole 53, and is exposed to the connecting hole 53. The carrier portion 33 abuts against the surface of the second extension 823 of the current collecting tray 80 facing away from the end cap 10. The sealing member 90 is sleeved on the circumferential side surface of the cylindrical body part 31 in the pole 30, so that the sealing member 90 is sleeved on the circumferential side surface of the pole 30. The seal 90 is mounted against the first insulator component 40 between the boss 42 and the carrier portion 33 of the post 30 to effect mounting of the seal 90 between the first insulator component 40 and the carrier portion 33.

At least one first communication hole 812 among the plurality of first communication holes 812 of the collecting tray 80 is disposed opposite to the through hole 64 of the second insulating member 60, so that gas generated from the electrode assembly can be rapidly collected to the pressure release hole 14 through the first communication hole 812 and the through hole 64 in sequence, and the explosion-proof valve covered on the pressure release hole 14 is facilitated to open. The bottom wall of the welding groove 813 of the plate body 81 of the current collecting plate 80 is welded to the electrode assembly, and the through hole 811 of the current collecting plate 80 is disposed opposite to the mandrel of the electrode assembly.

It will be appreciated that in the energy storage device 1000, the central axis of the middle position of the electrode assembly is filled with a large amount of electrolyte, the middle positions of the positive electrode sheet and the negative electrode sheet, which are close to the central axis, in the electrode assembly have the highest degree of infiltration in the electrolyte, and the positions of the circumference sides, which are far from the middle positions, have lower degree of infiltration in the electrolyte. The electrolyte in the energy storage device 1000 is gradually consumed during the use process, such as the cyclic charge and discharge process or the long-term storage process, so that the problem of uneven electrolyte distribution of the energy storage device 1000 after long-term use is more obvious. To ensure electrolyte content at the peripheral locations of the electrode assembly away from the mandrel, secondary distribution of electrolyte within the energy storage device 1000 is required such that more electrolyte is distributed to the peripheral locations of the electrode assembly away from the mandrel, i.e., such that more electrolyte is distributed to locations of the electrode assembly where electrolyte is scarce.

During actual use of the energy storage device 1000, such as during transportation, electrolyte within the energy storage device 1000 may be impacted from the mandrel of the electrode assembly toward the current collecting plate 80 due to vibration. In this embodiment, the middle extension 822 is disposed on the current collecting tray 80, and the diversion trench 83 is disposed on the first surface 801 of the middle extension 822, so that a portion of the electrolyte may impact the first surface 801 of the tray body 81 facing the middle extension 822, and the portion of the electrolyte may flow under the guidance of the diversion trench 83 and fall back to the first communication hole 812 and the through hole 811 disposed on the tray body 31 for secondary distribution of the electrolyte. Specifically, a portion of the electrolyte may impact the first groove 831 in the diversion trench 83, flow from the length direction of the first groove 831 to the first notch 833, flow out of the first notch 833 and drop to the tray 31, and fall back to the inside of the energy storage device 1000 through the first communication hole 812 and the through hole 811, so as to complete secondary distribution of the electrolyte. A portion of the electrolyte may impinge on the second groove 832 in the flow guide groove 83, flow from the fifth side wall 832b of the second groove 832 toward the second notch 834, and flow out of the second notch 834 and drop into the first communication hole 812 and the through hole 811 of the tray 31 to complete the secondary distribution of the electrolyte.

Meanwhile, a portion of the electrolyte may strike the second surface 802 of the intermediate extension 822 facing away from the tray body 81, and the portion of the electrolyte may flow along the diversion channels 86 formed between the portions of the bottom walls of the plurality of diversion trenches 83 protruding with respect to the second surface 802, and fall back to the first communication holes 812 and the through holes 811 for secondary distribution of the electrolyte. In this embodiment, the concave portion formed by the diversion trench 83 opposite to the first surface 801 and the convex portion formed by the trench bottom wall opposite to the second surface 802 are used to guide the electrolyte to flow, so that the content of the electrolyte at the position of the electrode assembly, which is far away from the periphery of the mandrel, is ensured, the performance of the energy storage device 1000 is further ensured, and the problem of lithium precipitation of the energy storage device is avoided.

In addition, in the present embodiment, by providing the first communication hole 812 and the through hole 811 in the tray body 81 of the current collecting tray 80, the electrolyte that has impacted the intermediate extension 822 and fallen back down to the tray body 81 under the guidance of the diversion trench during transportation of the energy storage device 1000 can be secondarily distributed through the first communication hole 812 and the through hole 811. In the process of secondary distribution of the electrolyte, since the total area S1 of the first communication hole 812 is set to be larger than the area S2 of the through hole 811, the flow rate of the electrolyte falling back through the first communication hole 812 is larger than the flow rate of the electrolyte falling back through the through hole 811, so that the content of the electrolyte falling back to the peripheral position of the electrode assembly, which is far from the mandrel, is larger than the content of the electrolyte falling back to the mandrel at the central position of the electrode assembly, thereby ensuring the content of the electrolyte at the peripheral position of the electrode assembly, which is far from the mandrel, further ensuring the performance of the energy storage device 1000, and avoiding the lithium precipitation problem of the energy storage device.

In operation of the electrode assembly of the energy storage device 1000, more electrolyte is consumed at the central spindle of the electrode assembly, and in some embodiments, 21% S2/S1% or less than 52% may be set to ensure that the electrode assembly has a sufficient electrolyte consumption at both the central spindle and the peripheral position of the electrode assembly away from the spindle.

The embodiment of the application also provides electric equipment, which comprises the energy storage device 1000, wherein the energy storage device 1000 supplies power for the electric equipment.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a current collecting plate 80 in an expanded state in an energy storage device 1000 according to a second embodiment of the present application.

The energy storage device 1000 of the second embodiment is the same as the energy storage device 1000 of the first embodiment in that the tray body 81 of the collecting tray 80 of the energy storage device 1000 of the second embodiment is further provided with a second communication hole 814.

Specifically, there are a plurality of second communication holes 814, and the plurality of second communication holes 814 are each provided to penetrate the disk portion 81 in the thickness direction of the disk portion 81 at intervals. The plurality of second communication holes 814 and the through holes 811 and the plurality of first communication holes 812 are arranged at intervals, and the plurality of second communication holes 814 and the plurality of first communication holes 812 are respectively positioned at opposite sides of the through holes 811. The sum of the areas of the second communication holes 814 is S3, and S3 > the area S2 of the through hole 811.

In operation of the electrode assembly of the energy storage device 1000, more electrolyte is consumed at the central spindle of the electrode assembly, and in some embodiments, 21% S2/S3% or less than 52% may be provided to ensure that the electrode assembly has a sufficient electrolyte consumption at the central spindle and at the peripheral of the electrode assembly away from the spindle.

In actual use, for example, during transportation, the electrolyte may impact in the direction of the current collecting tray 80 through the through hole 811 of the current collecting tray 80, impact to the middle extension 822 and fall back to the tray body 81 under the guidance of the diversion trench 83, and can fall back and pass through the first communication hole 812, the through hole 811 and the second communication hole 814 for secondary distribution of the electrolyte. Since the sum S3 of the areas of the second communication holes 814 is also larger than the area S2 of the through holes 811, the flow rate of the electrolyte falling back through the second communication holes 814 is larger than the flow rate of the electrolyte falling back through the through holes 811 to achieve secondary distribution of the electrolyte, and simultaneously, the flow rate of the electrolyte falling back to the peripheral position of the electrode assembly is ensured to be larger than the flow rate of the electrolyte falling back to the central position of the electrode assembly in the secondary distribution process, so that the content of the electrolyte at the peripheral position of the electrode assembly far away from the mandrel is ensured, and the performance of the energy storage device 1000 is ensured.

Further, by providing the first communication hole 812 and the second communication hole 814 at the both sides of the through hole 811 at the same time, the fallen electrolyte can be distributed to the circumferential side positions of the electrode assembly, which are away from the both sides of the mandrel, facilitating uniform distribution of the electrolyte. In this embodiment, the sum S1 of the areas of the first communication holes 812 and the sum S3 of the areas of the second communication holes 814 are equal, so that the fallen electrolyte can be uniformly distributed to the peripheral positions of the electrode assembly far from the two sides of the mandrel, which can effectively avoid the occurrence of the lithium precipitation phenomenon and ensure the performance of the energy storage device 1000.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a current collecting plate 80 in a folded state in an energy storage device 1000 according to a third embodiment of the present disclosure.

The energy storage device 1000 of the third embodiment has the same structure as the energy storage device 1000 of the first embodiment, except that the flow guide grooves 83 of the collecting tray 80 in the energy storage device 1000 of the third embodiment are different from the flow guide grooves 83 of the collecting tray 80 in the energy storage device 1000 of the first embodiment.

Specifically, the bottom wall of the flow guiding groove 83 in this embodiment is not protruded with respect to the second surface 802, i.e. the surface of the bottom wall of the flow guiding groove 83 facing away from the opening of the flow guiding groove 83 is substantially flush with the second surface 802. At this time, the electrolyte passing through the through hole 811 of the collecting plate 80 may be impacted to the diversion trench 83 provided on the first surface 801 under the action of vibration, diversion is performed to the plate body 81 along the diversion trench 83, and secondary distribution of the electrolyte is performed again through the first communication hole 812 and the through hole 811, so that the flow rate of the electrolyte falling back to the peripheral position of the electrode assembly is ensured to be greater than the flow rate of the electrolyte falling back to the central position of the electrode assembly in the secondary distribution process, thereby ensuring the content of the electrolyte at the peripheral position of the electrode assembly far away from the mandrel, and further ensuring the performance of the energy storage device 1000.

It is understood that the second communication holes 814 may be provided in the current collecting tray 80 of the present embodiment, and the second communication holes 814 are identical to the second communication holes 814 provided in the second embodiment.

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 (15)

1. An energy storage device (1000) is characterized by comprising an electrode assembly and a current collecting disc (80), wherein the current collecting disc (80) comprises a disc body part (81) and an extension part (82), the disc body part (81) is electrically connected with the electrode assembly, the disc body part (81) is provided with a through hole (811), the through hole (811) penetrates through the disc body part (81) along the thickness direction of the disc body part (81), the through hole (811) is positioned at the center of the disc body part (81),

extension (82) with disk body portion (81) fixed connection, and include with disk body portion (81) interval and relative middle extension (822) that set up, middle extension (822) including orientation first surface (801) of disk body portion (81) and with side (803) that first surface (801) are connected, middle extension (822) are equipped with at least one guiding gutter (83), the opening of guiding gutter (83) is located first surface (801), guiding gutter (83) run through side (803).

2. The energy storage device (1000) according to claim 1, wherein at least part of the first surface (801) is arranged opposite the through hole (811).

3. The energy storage device (1000) according to claim 2, wherein at least a portion of the flow guide groove (83) is disposed opposite the through hole (811) in the axial direction of the collecting tray (80).

4. A power storage device (1000) according to any of claims 1-3, wherein the side surface (803) comprises a first face (803 a) and a second face (803 b), the first face (803 a) and the second face (803 b) being arranged opposite each other in the width direction of the intermediate extension (822);

the middle extension section (822) is provided with a plurality of guide grooves (83), the guide grooves (83) comprise at least one first groove (831) and at least one second groove (832), the first groove (831) and the second groove (832) are arranged at intervals, the first groove (831) penetrates through the first surface (803 a), and the second groove (832) penetrates through the second surface (803 b).

5. A device (1000) according to any of claims 1-3, characterized in that the angle between the length direction of the channel (83) and the extension direction of the intermediate extension (822) is α, α being an obtuse or an acute angle.

6. A power storage device (1000) according to any of claims 1-3, wherein the intermediate extension (822) further comprises a second surface (802), the second surface (802) being arranged opposite to the first surface (801) and being connected to the side surface (803), the groove bottom wall of the flow guiding groove (83) protruding relative to the second surface (802);

the middle extension section (822) is provided with a plurality of diversion trenches (83), the diversion trenches (83) are arranged at intervals along the extension direction of the middle extension section (822), and diversion flow passages (86) are formed between the tank bottom walls of two adjacent diversion trenches (83).

7. The energy storage device (1000) according to claim 1, wherein the extension (82) comprises a first extension (821), the intermediate extension (822) and a second extension (823), the first extension (821) being fixedly connected with the tray body (81), the intermediate extension (822) being connected between the first extension (821) and the second extension (823).

8. The energy storage device (1000) according to claim 1, wherein the tray body (81) is further provided with a plurality of first communication holes (812), the plurality of first communication holes (812) each penetrate through the tray body (81) in a thickness direction of the tray body (81), the plurality of first communication holes (812) are arranged at intervals from each other and each are arranged at intervals from the through hole (811), a sum of areas of the plurality of first communication holes (812) is S1, and an area of the through hole (811) is S2, S1 > S2.

9. The energy storage device (1000) of claim 8, wherein 21% to 52% S2/S1.

10. The energy storage device (1000) according to claim 8, wherein the tray body (81) is further provided with a plurality of second communication holes (814), the plurality of second communication holes (814) each penetrate the tray body (81) in a thickness direction of the tray body (81), the plurality of second communication holes (814) are disposed at intervals from each other and from the through hole (811) and the plurality of first communication holes (812), and the plurality of second communication holes (814) and the plurality of first communication holes (812) are located on both sides of the through hole (811), respectively.

11. The energy storage device (1000) according to claim 10, wherein a sum of areas of the plurality of second communication holes (814) is S3, S3 > S2.

12. The energy storage device (1000) of claim 11, wherein 21% S2/S3% or less than 52%.

13. The energy storage device (1000) according to claim 11, wherein s1=s3.

14. The energy storage device (1000) according to any of claims 1 to 3, 7 to 13, wherein the electrode assembly has a mandrel, the mandrel of the electrode assembly being arranged opposite the through hole (811).

15. A powered device, characterized in that the powered device comprises an energy storage device (1000) as claimed in any of claims 1 to 14, the energy storage device (1000) powering the powered device.

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