Current collector plate, end cover assembly, energy storage device and electric equipment

Abstract

A current collecting plate, an end cover assembly, an energy storage device and an electrical equipment, the current collecting plate comprises a main body part and at least three first protruding parts; the at least three first protruding parts are uniformly distributed on the outer peripheral edge of the main body part at intervals, the first protruding part is bent relative to the main body part, and the extension direction of the first protruding part is the direction from the outer peripheral edge of the main body part to the central axis of the main body part. The current collecting plate, the end cover assembly, the energy storage device and the electrical equipment provided by the embodiment of the application are convenient for abutting the first protruding part against the side wall at the side opening of the shell of the energy storage device, the bent first protruding part is used to guide the coaxial insertion of the current collecting plate into the shell of the energy storage device, so that the current collecting plate is quickly assembled into the shell, the coaxial center welding of the current collecting plate and the shell in the subsequent process is realized, welding misalignment is avoided, the precision requirement of the operator during assembly is reduced, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a current collector plate, an end cover assembly, an energy storage device and an electric equipment. BACKGROUND

[0002] The energy storage device mainly uses chemical elements in the battery as energy storage medium. The charging and discharging process is accompanied by chemical reaction or change of the energy storage medium. In simple terms, the energy storage device stores the wind energy and solar energy in the chemical battery, and releases the stored energy for use when the external power use reaches the peak, or transfers the stored energy to places where the power is in short supply for use.

[0003] Taking a cylindrical battery in the energy storage device as an example, the cylindrical battery includes a shell, a cover plate and an electrode assembly. The electrode assembly has two current collector plates welded at both ends. The cover plate is fixedly connected with the open end of the shell to form a sealed cavity. The electrode assembly is located in the sealed cavity. The current collector plate located at the bottom is welded with the bottom of the shell, and the current collector plate located at the top is electrically connected with the pole column on the cover plate. The current collector plate located at the top usually extends a bent end at one side to form a gap between the current collector plate and the cover plate. The gap is used for the electrolyte to fill and infiltrate the electrode assembly downward. However, it is difficult to align the current collector plate and the electrode assembly during the assembly of the energy storage device, and it is difficult to ensure the coaxiality of the current collector plate, the electrode assembly and the shell. Therefore, the welding is not good, which affects the production efficiency of the energy storage device. SUMMARY

[0004] The purpose of the present application is to provide a current collector plate, an end cover assembly, an energy storage device and an electric equipment, which solves the technical problem that the current collector plate of the battery is difficult to align in the prior art.

[0005] In order to achieve the purpose of the present application, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a current collector plate, comprising:

[0007] a main body portion;

[0008] At least three first protrusions are evenly distributed on the outer periphery of the main body part at intervals, the first protrusions are bent relative to the main body part, and the extension direction of the first protrusions is from the outer periphery of the main body part to the central axis of the main body part. In this embodiment, the bent end of the main body part does not need to extend on one side, the processing procedure is saved, and the production efficiency is improved. By arranging the first protrusions to be bent relative to the main body part and the extension direction of the first protrusions to be from the outer periphery of the main body part to the central axis of the main body part, the first protrusions are convenient to abut against the side wall at the side opening of the shell of the energy storage device, the first protrusions are used to guide the coaxial insertion of the current collector plate into the shell of the energy storage device, so that the current collector plate is quickly assembled into the shell, the coaxial welding of the current collector plate and the shell in the subsequent process is realized, welding misalignment is avoided, the precision requirement of the operator during assembly is reduced, and the production cost is reduced.

[0009] In an embodiment, the main body part has a first surface and a second surface arranged opposite to each other, and the first protrusions are bent toward the side where the first surface is located.

[0010] The current collector plate further comprises a second protrusion, the second protrusion is located on the outer periphery of the main body part, and the second protrusion is protruded relative to the second surface. In this embodiment, the second protrusion is used to be clamped on the outer periphery of the electrode assembly, the positioning of the electrode assembly and the current collector plate is realized, the coaxial welding of the electrode assembly and the current collector plate is ensured, and the welding misalignment of the electrode assembly and the current collector plate is avoided.

[0011] In an embodiment, the first protrusion is at a preset angle α with the first surface, and the preset angle α satisfies the relationship: 60°≤α≤85°. In this embodiment, the first protrusion can have an inclined surface, the positioning and assembly are realized during the assembly of the current collector plate and the electrode assembly into the shell of the energy storage device, and the production efficiency of the energy storage device is improved.

[0012] In an embodiment, the second protrusion is perpendicular to the second surface, the second protrusion is convenient to be clamped on the outer periphery of the wound electrode assembly, and the coaxial welding of the current collector plate and the electrode assembly is facilitated.

[0013] In an embodiment, the number of the second protrusions is multiple, and the multiple second protrusions are arranged at intervals along the circumference of the main body part, the guiding effect of the first protrusions at multiple positions of the main body part and the positioning effect of the second protrusions at multiple positions of the main body part are ensured.

[0014] In one embodiment, the first and second protrusions are alternately distributed along the circumference of the main body, which is beneficial for saving the forming process and improving the production efficiency, and forms a uniform distribution of guiding and limiting structure.

[0015] In one embodiment, the current collector further comprises an insulating mounting member, which is sleeved on the main body and in contact with the first surface, and the second protrusion is arranged on the outer peripheral edge of the insulating mounting member. In this embodiment, during the processing of the current collector, after the main body is punched, it only needs to be bent once to form the first protrusion, and does not need to be bent again in the opposite direction to form the second protrusion, thereby reducing the sheet metal forming steps of the current collector and improving the production efficiency of the current collector; the insulating mounting member can avoid scratching the outer peripheral wall of the wound electrode assembly during assembly alignment, causing internal short circuit of the battery due to electrical connection with the negative electrode sheet.

[0016] In one embodiment, the second protrusion is in the form of a continuous ring, and the extension length of the second protrusion in the thickness direction of the main body is greater than the thickness of the main body. In this embodiment, the second protrusion can cover the outer peripheral surface of the electrode assembly, avoiding the burrs formed by mechanical cutting processing at the abutting part of the cover plate and the shell during assembly of the positive electrode cover plate, which fall into the wound electrode assembly and cause internal short circuit of the energy storage device.

[0017] In one embodiment, the number of insulating mounting members is multiple, and each insulating mounting member is in the form of a circular arc and is sleeved on a part of the outer peripheral edge of the main body. The extension length of the second protrusion in the thickness direction of the main body is greater than the thickness of the main body. In this embodiment, the flexibility and freedom of the insulating mounting member are increased, and the weight of the insulating mounting member is reduced.

[0018] In one embodiment, the main body is recessed with a groove region, and the groove region extends from the center axis of the main body to the edge of the main body. In this embodiment, the lower surface of the groove region can tightly abut the bent tab of the electrode assembly, making the laser welding more firm and reliable.

[0019] In one embodiment, the groove region is multiple, and the multiple groove regions are uniformly and spacedly distributed along the circumference of the main body to divide the main body into multiple main body regions. In this embodiment, by arranging multiple groove regions, multiple welding positions are provided for the current collector and the electrode assembly, thereby ensuring the stability and reliability of the connection between the current collector and the electrode assembly.

[0020] In one embodiment, each of the body regions comprises at least one first protrusion and at least one second protrusion. In this embodiment, the positioning and guiding effects of the first protrusions and the second protrusions in each body region are ensured.

[0021] In one embodiment, the number of the groove regions is three, and the number of the second protrusions is at least three. In this embodiment, the positioning and guiding effects of the first protrusions and the second protrusions on the body part are ensured.

[0022] In one embodiment, the heat sink further comprises insulating mounting members, the insulating mounting members are sleeved on the body part and in contact with the side surface of the body part on which the first protrusions are located, and the second protrusions are arranged on the outer peripheral edges of the insulating mounting members.

[0023] The number of the insulating mounting members is plural, and each of the insulating mounting members is arranged on the outer peripheral edge of each of the body regions. In this embodiment, the flexibility and freedom of the mounting members are increased, and the mounting members can be conveniently installed, disassembled or replaced, thereby improving the maintenance efficiency of the mounting members.

[0024] In one embodiment, each of the insulating mounting members has a groove region between any two adjacent insulating mounting members, and the distance between the two adjacent insulating mounting members is greater than the width of the groove region. In this embodiment, the interference of the mounting members with the groove region can be avoided, the welding area of the heat sink and the electrode assembly can be reduced, and the effects of the heat sink and the connection between the heat sink and the electrode assembly can be prevented from being affected.

[0025] In one embodiment, the mounting members comprise clearance holes for exposing the first protrusions. In this embodiment, the clearance holes provide clearance positions for the first protrusions, and the working effects of the first protrusions are ensured.

[0026] In one embodiment, each of the first protrusions and each of the second protrusions on the body part is provided with a notch on both sides. In this embodiment, the notches on both sides of the first protrusions and the second protrusions can form a gas flow channel, so that the gas in the shell passes through the clearance holes and is collected below the explosion-proof valve of the cover plate, thereby improving the gas gathering effect and ensuring the safety of the energy storage device.

[0027] In one embodiment, the first protruding portion is arc-shaped at the end of the main body portion. In this embodiment, during assembly of the current collector plate and the energy storage device shell, the friction between the first protruding portion and the inner wall of the energy storage device shell is reduced, the first protruding portion is guided along the inner wall of the energy storage device shell, and metal debris generated by scratching between the first protruding portion and the inner wall of the energy storage device shell is prevented from falling into the wound electrode assembly to cause internal short circuit of the battery.

[0028] In a second aspect, the application provides an end cover assembly, comprising a cover plate and the current collector plate according to any one of the embodiments of the first aspect, and the current collector plate is connected to the cover plate.

[0029] In a third aspect, the application provides an energy storage device, comprising: a shell having openings on both sides in the length direction; an electrode assembly accommodated in a space enclosed by the shell; and the end cover assembly according to the second aspect, wherein the current collector plate of the end cover assembly is fixedly connected to the electrode assembly, the current collector plate is accommodated in the space enclosed by the shell, the cover plate of the end cover assembly is connected to the shell to close the first side opening of the shell, and the first protruding portion of the current collector plate is used to abut the side wall of the second side opening of the shell to assemble the current collector plate and the electrode assembly into the space enclosed by the shell.

[0030] In a fourth aspect, the application provides an electric device, comprising the energy storage device according to the third aspect, and the energy storage device is used to supply power to the electric device.

[0031] The current collector plate, the end cover assembly, the energy storage device and the electric device provided by the embodiments of the application do not need to extend a bent end from one side of the main body portion, thereby saving the processing procedure and improving the production efficiency. By arranging the first protruding portion to be bent relative to the main body portion and arranging the extension direction of the first protruding portion to be from the outer periphery of the main body portion to the central axis of the main body portion, the first protruding portion is abutted with the side wall at one side opening of the shell of the energy storage device, the bent first protruding portion is used to guide the current collector plate to be coaxially inserted into the shell of the energy storage device, the current collector plate is quickly assembled into the shell, the coaxial welding of the current collector plate and the shell in the subsequent procedure is realized, the welding misalignment is avoided, the precision requirement of the operator during assembly is reduced, and the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0033] Figure 1 is a structural schematic diagram of a household energy storage system according to an embodiment;

[0034] Figure 2 is a structural schematic diagram of a current collector plate according to an embodiment;

[0035] Figure 3 is Figure 2 is an enlarged view of A in FIG. 1;

[0036] Figure 4 is one of the perspective views of a current collector plate according to an embodiment;

[0037] Figure 5 is another of the perspective views of a current collector plate according to an embodiment;

[0038] Figure 6 is a perspective view of a current collector plate according to another embodiment;

[0039] Figure 7 is a perspective view of a current collector plate according to yet another embodiment;

[0040] Figure 8 is a structural schematic diagram of a mounting member according to an embodiment;

[0041] Figure 9 is a structural schematic diagram of a mounting member according to another embodiment.

[0042] BRIEF DESCRIPTION OF DRAWINGS

[0043] 100 - energy storage device; 200 - electric energy conversion device; 300 - user load; 10 - main body; 11 - first surface; 12 - second surface; 13 - recessed area; 14 - main body area; 20 - first protrusion; 21 - notch; 30 - insulating mounting member; 31 - second protrusion; 32 - clearance hole; 33 - main plate; 34 - side wall; 40 - first vent hole; 50 - second vent hole. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0045] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be an intervening component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be an intervening component.

[0046] In this application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0047] Unless otherwise defined, all technical and scientific terms used in the application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing the specific embodiments of the application, and are not intended to limit the application. The term "and / or" used in the application includes any and all combinations of one or more related listed items.

[0048] In the description of the embodiments of the application, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "inner", "outer" and the like is based on the orientation or positional relationship described in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0049] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can include at least one of the features explicitly or implicitly. In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited.

[0050] Some embodiments of the application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0051] Since the energy required by people has strong time and space, in order to reasonably use energy and improve the utilization rate of energy, it is necessary to store one form of energy into the same form or convert into another form of energy through a medium or device, and release it in a specific energy form based on future application needs. It is well known that the main way to generate green electricity at present is to develop photovoltaic, wind power and other green energy to replace fossil energy.

[0052] At present, the generation of green electricity generally depends on photovoltaic, wind power, water potential, etc., and wind power and solar energy generally have strong intermittency and large volatility, which can cause unstable power grid, insufficient electricity at peak power consumption, too much electricity at low power consumption, and unstable voltage can also cause damage to electricity, therefore, due to insufficient electricity demand or insufficient grid accommodation capacity, the problem of "abandoning wind and light" may occur, and to solve these problems, energy storage is needed, that is, the electricity is stored in other forms of energy through physical or chemical means, and the energy is released as electricity when needed. In short, energy storage is like a large "power bank", which stores electricity when photovoltaic and wind power is sufficient, and releases stored electricity when needed.

[0053] Taking electrochemical energy storage as an example, an energy storage device 100 is provided in the embodiment of the present application, which is provided with a group of energy storage batteries inside, mainly using chemical elements in the battery as energy storage medium, and the charging and discharging process is accompanied by chemical reaction or change of the energy storage medium. In short, the electricity generated by wind and solar energy is stored in a chemical battery, and the stored electricity is released for use when the use of external electricity reaches the peak, or is transferred to a place where electricity is in short supply for use.

[0054] At present, the application scenarios of energy storage (i.e. energy storage) are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage and user side energy storage, and the corresponding types of energy storage devices 100 include:

[0055] (1) Large energy storage containers applied in power grid side energy storage scenarios, which can be used as high-quality active and reactive power regulation power sources in the power grid, realize load matching of electricity in time and space, enhance renewable energy consumption capacity, and are of great significance in power grid system backup, relieving peak load power supply pressure and peak regulation;

[0056] (2) Small and medium-sized energy storage cabinets applied in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and household small energy storage boxes applied in household energy storage scenarios on the user side, the main operation mode of which is "peak clipping and valley filling". Because there is a large price difference in electricity charges at peak and valley positions according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinet / box during the low electricity price period; and release the electricity in the energy storage equipment for use during the high electricity price period, so as to achieve the purpose of saving electricity charges. In addition, in remote areas and areas where natural disasters such as earthquakes and hurricanes are prone to occur, the existence of household energy storage devices is equivalent to that the users provide backup power for themselves and the power grid, and avoid the inconvenience caused by frequent power outages due to disasters or other reasons.

[0057] The embodiment of the present application takes the household energy storage scenario in the user side energy storage as an example for description, and the energy storage device provided in the embodiment of the present application is not limited to the household energy storage scenario.

[0058] The embodiments of the present application provide a household energy storage system, as shown in the accompanying drawings, which comprises an electric energy conversion device 200, a user load 300, and an energy storage device 100. The energy storage device 100 is a small energy storage box which can be installed on an outdoor wall by a wall hanging method. The user load 300 can be a street lamp or a household appliance. Specifically, the electric energy conversion device 200 can be a photovoltaic panel which can convert solar energy into electric energy during a low electricity price period. The energy storage device 100 is used to store the electric energy and supply the street lamp and the household appliance for use during a high electricity price period or during a power grid outage. Figure 1

[0059] It can be understood that the energy storage device 100 can include, but is not limited to, a single battery, a battery module, a battery pack, a battery system, etc. When the energy storage device is a single battery, it can be a cylindrical battery or a square battery.

[0060] The present application provides a power consumption device comprising an energy storage device 100 for supplying power to the power consumption device. The power consumption device can include a user load 300 or a vehicle, an electronic device, a household appliance, etc.

[0061] Specifically, the energy storage device 100 provided by the embodiments of the present application comprises a shell, an electrode assembly, and an end cover assembly. The shell has openings on both sides in the length direction, the electrode assembly is accommodated in the space enclosed by the shell, the current collector disc of the end cover assembly is fixedly connected with the electrode assembly, the current collector disc is accommodated in the space enclosed by the shell, the cover plate of the end cover assembly is connected with the shell to close the first side opening of the shell, and the first protruding part 20 of the current collector disc is used to abut and match with the side wall of the second side opening of the shell to assemble the current collector disc and the electrode assembly into the space enclosed by the shell.

[0062] The present application provides an end cover assembly comprising a cover plate and a current collector disc, and the current collector disc is connected with the cover plate. The end cover assembly is installed on the energy storage device 100 to close the shell of the energy storage device 100. As shown in the accompanying drawings, the current collector disc provided by the embodiments of the present application comprises a main body part 10 and at least three first protruding parts 20. The at least three first protruding parts 20 are uniformly distributed on the outer peripheral edge of the main body part 10 at intervals, the first protruding part 20 is bent relative to the main body part 10, and the extension direction of the first protruding part 20 is from the outer peripheral edge of the main body part 10 to the central axis of the main body part 10. It should be noted that the at least three first protruding parts 20 uniformly distributed on the outer peripheral edge of the main body part 10 at intervals means that the plurality of first protruding parts 20 can be uniformly distributed one by one, or at least two uniformly distributed first protruding parts 20 form a group, and the plurality of groups of first protruding parts 20 are uniformly distributed at intervals. Figures 2 to 7 Figure 7 ​​As shown, every three first protrusions 20 form a group, and the three groups are evenly spaced apart, with the three first protrusions 20 in each group being evenly spaced apart.

[0063] like Figure 4 As shown, the main body 10 of the current collector can be in the shape of a circular flat plate, which allows the current collector to be adapted to the cross-sectional shape of the cylindrical battery casing. This enables it to be widely used in cylindrical batteries and facilitates the attachment between the wound electrode assembly and the current collector, as well as between the cover plate and the current collector, ensuring a sealed connection between the current collector and the cylindrical battery casing.

[0064] For example, the current collector provided in this application embodiment is used in a cylindrical battery. The cylindrical battery includes a casing, a cover plate, and an electrode assembly. Current collectors are welded to both ends of the electrode assembly. The cover plate is fixedly connected to the open end of the casing to form a sealed cavity. The electrode assembly is located inside the sealed cavity. One current collector is welded to the bottom of the casing, and the other current collector is electrically connected to the electrode post on the cover plate. The current collector provided in this application embodiment can be a positive current collector or a negative current collector, which can be flexibly selected according to actual needs. For example, when the current collector is made of aluminum, it can be used as a positive current collector and welded to an aluminum cover plate.

[0065] In one specific embodiment, the processing of the manifold is as follows: the main body 10 is punched, material for the first protrusion 20 is reserved at the edge of the main body 10, and the first protrusion 20 is bent relative to the main body 10, with the extension direction of the first protrusion 20 being from the outer periphery of the main body 10 to the central axis of the main body 10. It is understood that the first protrusion 20 can be an integral part of the main body 10 or a separate part, and the choice can be made according to specific requirements in practical applications.

[0066] In a specific embodiment, the current application provides a current collecting plate, which is a positive current collecting plate. The first protruding part 20 is located on the side of the housing of the energy storage device 100, which is away from the electrode assembly. After the current collecting plate and the positive side tab of the electrode assembly are welded, the current collecting plate and the electrode assembly need to be inserted into the other opening from the one side opening of the housing. During the process of assembling the current collecting plate and the electrode assembly into the housing, the assembly needs to be very accurate because there is only a small fitting gap (generally ±0.25mm) between the electrode assembly and the inner wall of the housing. The first protruding part 20 is bent relative to the main body part 10. The first protruding part 20 is abutted to the side wall of the one side opening of the housing. The current collecting plate and the electrode assembly are inserted into the housing through the slope of the first protruding part 20. Then, the current collecting plate and the electrode assembly are swung to the direction of the other opening. As a result, the current collecting plate and the electrode assembly are successfully assembled into the housing. The precision requirement of the operator is reduced. The production efficiency of the energy storage device 100 is improved. The production cost of the energy storage device 100 is reduced.

[0067] At least three first protruding parts 20 are arranged. The center of the circle is determined by at least three points. The coaxial assembly effect of the current collecting plate and the housing is improved. The first protruding parts 20 are uniformly distributed on the outer circumferential edge of the main body part 10. The fitting effect of the plurality of first protruding parts 20 and the side wall of the opening of the housing of the energy storage device 100 is ensured. The positioning and guiding effects of the fast assembly are achieved.

[0068] In addition, the current application provides a current collecting plate. The side edge of the current collecting plate does not need to be provided with a bent end. Therefore, the laser spot welding reinforcement does not need to be added to the bent end. The production efficiency of the current collecting plate and the energy storage device 100 is improved. The current collecting plate does not need to extend the bent end on one side of the main body part 10. The machining process is saved. The production efficiency is improved. The first protruding part 20 is bent relative to the main body part 10. The extension direction of the first protruding part 20 is from the outer circumferential edge of the main body part 10 to the center axis of the main body part 10. The first protruding part 20 is abutted to the side wall of the one side opening of the housing of the energy storage device 100. The current collecting plate is coaxially inserted into the housing of the energy storage device 100 through the bent first protruding part 20. As a result, the current collecting plate is quickly assembled into the housing. The coaxial welding of the current collecting plate and the housing in the subsequent process is achieved. The welding misalignment is avoided. The precision requirement of the operator during the assembly is reduced. The production cost is reduced.

[0069] Optionally, the end of the first protruding portion 20 away from the main body portion 10 is arc-shaped. By setting the end of the first protruding portion 20 away from the main body portion 10 to be arc-shaped, the friction between the first protruding portion 20 and the inner wall of the energy storage device 100 shell before the current collector plate and the energy storage device 100 shell are assembled is reduced, the first protruding portion 20 is conveniently installed and guided along the inner wall of the energy storage device 100 shell, and metal debris generated by scratching between the first protruding portion 20 and the inner wall of the energy storage device 100 shell is avoided from falling into the inside of the electrode assembly, thereby causing internal short circuit of the energy storage device 100.

[0070] Further, the main body portion 10 has a first surface 11 and a second surface 12 arranged opposite to each other, and the first protruding portion 20 is bent towards the side where the first surface 11 is located. The current collector plate further comprises a second protruding portion 31, which is located at the outer circumferential edge of the main body portion 10 and protrudes relative to the second surface 12.

[0071] The second protruding portion 31 is used for clamping the outer circumferential edge of the electrode assembly, so as to position the electrode assembly and the current collector plate, ensure coaxial welding of the electrode assembly and the current collector plate, and avoid mispositioning of the electrode assembly and the current collector plate during welding, which makes it difficult to assemble the electrode assembly and the current collector plate into the shell of the energy storage device 100, thereby reducing the production yield of the energy storage device 100.

[0072] Specifically, the second protruding portion 31 is clamped to the outer circumferential edge of the electrode assembly, so that the current collector plate is located on the upper surface of the positive electrode tab, the electrode assembly is positioned, the current collector plate is welded to the positive electrode tab of the electrode assembly, coaxial welding of the current collector plate and the electrode assembly is achieved, and mispositioning of the current collector plate and the electrode assembly during welding is avoided.

[0073] In a specific embodiment, as shown in Figure 3 the first protruding portion 20 and the first surface 11 form a preset angle a, and the preset angle a satisfies the relationship: 60°≤a≤85°. By setting the included angle a between the first protruding portion 20 and the first surface 11 to be between 60° and 85°, the first protruding portion 20 can have an inclined surface, so that the current collector plate and the electrode assembly can be quickly positioned and assembled during assembly into the shell of the energy storage device 100, thereby improving the production efficiency of the energy storage device 100.

[0074] In a specific embodiment, as shown in Figure 2 the second protruding portion 31 is perpendicular to the second surface 12, so that the second protruding portion 31 is perpendicular to the radial direction of the main body portion 10. The second protruding portion 31 is used for connecting the electrode assembly, and by setting the second protruding portion 31 to be perpendicular to the second surface 12, the second protruding portion 31 is conveniently clamped to the outer circumferential edge of the wound electrode assembly, which is conducive to coaxial welding of the current collector plate and the electrode assembly.

[0075] In a further embodiment, there are multiple second protrusions 31, which are spaced apart circumferentially along the main body 10. For example, the multiple second protrusions 31 are evenly distributed on the main body 10 to ensure the connection effect of the second protrusions 31 at the outer periphery of the electrode assembly.

[0076] Furthermore, multiple first protrusions 20 and multiple second protrusions 31 are alternately distributed along the circumferential interval of the main body 10. In this embodiment, a second protrusion 31 is provided between any two adjacent first protrusions 20, and the first protrusions 20 and second protrusions 31 are alternately distributed along the outer periphery of the main body 10, forming a uniform guiding and limiting structure. Moreover, in this embodiment, the manifold can be formed by cutting the sheet material once and bending it twice, saving forming steps and improving production efficiency.

[0077] Optionally, such as Figure 4 or Figure 5 As shown, each first protrusion 20 and each second protrusion 31 on the main body 10 has a notch 21 on both sides. By creating notches 21 on both sides of the first protrusion 20 and the second protrusion 31, a gas flow channel can be formed, allowing the gas inside the outer casing to pass through the relief hole 32 and collect below the explosion-proof valve of the cover plate, thereby improving the gas collection effect and ensuring the safety of the energy storage device 100.

[0078] In an optional embodiment, the current collector further includes an insulating mounting member 30, which is sleeved on the main body 10 and contacts the first surface 11. A second protrusion 31 is disposed on the outer periphery of the insulating mounting member 30. In this embodiment, the first protrusion 20 and the main body 10 are an integral structure, while the second protrusion 31 and the main body 10 are separate structures. During the processing of the current collector, after the main body 10 is punched, it only needs to be bent once to form the first protrusion 20, without needing to be bent again in the opposite direction to form the second protrusion 31. This reduces the sheet metal forming steps of the current collector and helps to improve the production efficiency of the current collector. Furthermore, the insulating mounting member 30 can prevent the second protrusion 31 from scratching the outer peripheral wall of the electrode assembly during assembly and alignment, thus avoiding electrical connection with the negative electrode sheet and causing an internal short circuit in the battery. Understandably, the shape and size of the insulating mounting part 30 match the main body 10, which helps to improve the adaptability of the insulating mounting part 30, facilitates the replacement of the insulating mounting part 30, and improves the maintenance efficiency of the manifold.

[0079] The insulating mounting element 30 can be made of metal, alloy, or plastic. For example, in one embodiment, the insulating mounting element 30 is made of plastic, which can prevent the second protrusion 31 from scratching the insulating film on the top of the electrode assembly during the engagement with the electrode assembly, thereby reducing the risk of thermal runaway caused by short circuit inside the energy storage device 100.

[0080] In an optional embodiment, the second protrusion 31 is in a continuous ring shape, and specifically, the insulating mounting member 30 comprises a main plate 33 and a side wall 34, the main plate 33 is in a circular flat shape or a circular ring flat shape, and the side wall 34 is arranged at the outer circumferential edge of the main plate 33 and protrudes outward relative to the main plate 33 to form the second protrusion 31. The side wall 34 is continuously distributed along the circumference of the main plate 33 to form the second protrusion 31 in a continuous ring shape.

[0081] For example, the side wall 34 is perpendicular to the main plate 33 to form the second protrusion 31 perpendicular to the main body 10. Further, the extension length of the second protrusion 31 in the thickness direction of the main body 10 is greater than the thickness of the main body 10, that is, the length of the side wall 34 of the insulating mounting member 30 is greater than the thickness of the main body 10, so that the second protrusion 31 protrudes outward relative to the second surface 12, and the positioning clamping of the second protrusion 31 and the electrode assembly is achieved. Moreover, the second protrusion 31 can be arranged on the outer circumferential surface of the electrode assembly, so as to avoid that the burrs formed after the abutting part of the cover plate and the shell is mechanically cut during the assembly of the positive electrode cover plate are scraped off and fall into the wound electrode assembly, thereby causing internal short circuit of the energy storage device 100.

[0082] In an optional embodiment, the main plate 33 of the insulating mounting member 30 is in a circular flat shape and covers the first surface 11 of the main body 10, the main body 10 is located in the space surrounded by the main plate 33 and the side wall 34, and the main plate 33 is attached to the first surface 11 of the main body 10.

[0083] In another optional embodiment, as shown in Figure 6 The insulating mounting member 30 is annularly arranged on the outer circumferential edge of the main body 10. Specifically, the main plate 33 of the insulating mounting member 30 is in a circular ring shape and covers the outer circumferential edge of the main body 10, the main body 10 is located in the space surrounded by the main plate 33 and the side wall 34, and the main plate 33 is attached to part of the first surface 11 of the main body 10. By arranging the main plate 33 of the insulating mounting member 30 in a ring shape, the processing difficulty and manufacturing cost of the insulating mounting member 30 are reduced, and the installation, disassembly and replacement of the insulating mounting member 30 are facilitated.

[0084] In yet another optional embodiment, the number of the insulating mounting members 30 is multiple, and the insulating mounting members 30 are in a circular arc shape, each of the insulating mounting members 30 is arranged on part of the outer circumferential edge of the main body 10. Specifically, the main plate 33 of the insulating mounting member 30 is in a circular arc shape and covers part of the outer circumferential edge of the main body 10, each of the insulating mounting members 30 has one or more second protrusions 31. Among them, the insulating mounting member 30 can be one or more, and multiple insulating mounting members 30 can be continuously or intermittently distributed on the outer circumferential edge of the main body 10, thereby increasing the flexibility and freedom of the insulating mounting member 30 and reducing the weight of the insulating mounting member 30. For example Figure 7As shown, the three insulating mounting parts 30 are evenly spaced along the circumference of the main body 10.

[0085] Optionally, the insulating mounting component 30 is connected to the main body 10 via a snap-fit ​​connection. The insulating mounting component 30 is provided with a snap-fit ​​element, and the main body 10 is provided with a snap-fit ​​groove. The snap-fit ​​connection between the insulating mounting component 30 and the main body 10 is achieved by embedding the snap-fit ​​element into the snap-fit ​​groove. Alternatively, the insulating mounting component 30 is provided with a snap-fit ​​groove, and the main body 10 is provided with a snap-fit ​​element. The snap-fit ​​connection between the insulating mounting component 30 and the main body 10 is achieved by embedding the snap-fit ​​element into the snap-fit ​​groove. By providing a detachable connection between the insulating mounting component 30 and the main body 10, the flexibility and freedom of the insulating mounting component 30 are increased, facilitating the installation, disassembly, or replacement of the insulating mounting component 30 and improving the efficiency of maintenance or repair of the insulating mounting component 30.

[0086] Optionally, the insulating mounting component 30 and the main body 10 are fixedly connected by welding, bonding or other methods to ensure the installation strength between the insulating mounting component 30 and the main body 10.

[0087] The main body 10 has a recessed groove area 13, which extends from the central axis of the main body 10 toward the edge of the main body 10. Specifically, as shown in... Figure 4 , Figure 6 or Figure 7 As shown, the groove region 13 is recessed relative to the first surface 11 of the main body 10 and extends in the radial direction of the main body 10. The groove region 13 can be obtained by stamping the first surface 11 of the main body 10 and correspondingly forming a protrusion on the second surface 12.

[0088] The bottom wall of the recessed area 13 can tightly abut against the overturned tabs on the electrode assembly, preventing incomplete welding caused by the tabs not fitting properly with the current collector during laser welding. The recessed area 13 also defines the welding position, facilitating laser head alignment and welding. Furthermore, the recessed area 13 provides space to accommodate small metal particles generated during welding, preventing them from splashing into the electrode assembly and causing a short circuit inside the energy storage device 100. Specifically, after the positive electrode cover of the energy storage device 100 is welded, the metal particles are all contained within the recessed space of the recessed area 13. After liquefaction is completed, the energy storage device 100 is flipped to form a module fixture. At this time, the current collector is flipped, and the metal particles fall into the bottom of the outer shell of the energy storage device 100 under gravity. Throughout the entire process, the metal particles will not fall into the electrode assembly and cause a short circuit.

[0089] Furthermore, there are multiple groove areas 13, which are evenly spaced along the circumference of the main body 10 to divide the main body 10 into multiple main body regions 14. For example... Figure 4As shown, the groove area 13 is three, which divides the main body 10 into three main body areas 14. By setting multiple groove areas 13, multiple welding positions are provided for the current collector plate and the electrode assembly, ensuring the uniformity and reliability of the connection force between the current collector plate and the electrode assembly.

[0090] For example Figure 4 As shown, the three groove areas 13 are centrally symmetrically distributed about the center axis of the main body 10, and the distance between any two adjacent groove areas 13 is the same.

[0091] Each main body area 14 includes at least one first protruding part 20 and at least one second protruding part 31, for example Figure 4 As shown, each main body area 14 includes three first protruding parts 20 and two second protruding parts 31. In a specific embodiment, the groove area 13 is three, and the number of first protruding parts 20 and second protruding parts 31 is at least three, to ensure the positioning and guiding effect of the first protruding part 20 and the second protruding part 31 in each main body area 14.

[0092] In a further embodiment, the current collector plate includes a plurality of insulating mounting parts 30, which are arranged one by one on the outer peripheral edge of the plurality of main body areas 14. For example Figure 7 As shown, one arc-shaped insulating mounting part 30 is mounted on the edge of each main body area 14, and the plurality of insulating mounting parts 30 are distributed with intervals, and the interval area between adjacent insulating mounting parts 30 forms a gas flow channel, so that the gas in the shell flows through the gas flow channel and collects under the explosion-proof valve of the cover plate, improving the gas gathering effect, timely relieving the pressure of the energy storage device 100, and ensuring the safety of the energy storage device 100.

[0093] It can be understood that, on the basis of any of the above embodiments, the insulating mounting part 30 includes a relief hole 32, which is used to expose the first protruding part 20 and provide a relief position for the first protruding part 20, to ensure the working effect of the first protruding part 20. The relief hole 32 can be arranged only on the main plate 33, for example Figure 8 As shown, the side wall 34 is continuously distributed on the outer peripheral edge of the main plate 33, presenting a complete ring shape; the relief hole 32 can also extend from the main plate 33 to the side wall 34, for example Figure 9 As shown, the side wall 34 is discontinuously distributed on the outer peripheral edge of the main plate 33, and has an interval between adjacent second protruding parts 31, which can form a gas flow channel, so that the gas in the shell passes through the relief hole 32 and collects under the explosion-proof valve of the cover plate, improving the gas gathering effect, timely relieving the pressure of the energy storage device 100, and ensuring the safety of the energy storage device 100. The relief hole 32 can be circular, rectangular, elliptical or any other shape, as long as it can completely expose the first protruding part 20.

[0094] The distance between the two adjacent insulating mounting pieces 30 is greater than the width of the groove area 13, which can avoid the interference of the insulating mounting piece 30 to the groove area 13, reduce the welding area of the current collecting plate and the electrode assembly, prevent the influence on the current collecting effect of the current collecting plate and the firmness of the connection between the current collecting plate and the electrode assembly.

[0095] The central region of the main body part 10 is coaxially provided with a first air vent 40, and each main body region 14 of the main body part 10 is provided with a second air vent 50. The second air vent 50 is multiple, and the multiple air vents can be distributed at intervals along the circumference of the main body part 10. By arranging the first air vent 40 and the second air vent 50, the gas pressure relief channel is increased, which is beneficial to guide the gas out when the electrode assembly is out of control, timely gas pressure relief, prevent the internal gas pressure of the energy storage device 100 from being too high, and improve the safety and reliability of the energy storage device 100.

[0096] Each main body region 14 is provided with multiple second air vents 50, which increases the area of the gas pressure relief channel and improves the safety and reliability of the energy storage device 100. As shown in Figures 4 to 7 Each main body region 14 is provided with eight second air vents 50.

[0097] Further, the multiple second air vents 50 can be arrayed on each main body region 14, which improves the uniformity and timeliness of the gas pressure relief. For example, the multiple second air vents 50 are annularly distributed on each main body region 14. For another example, the multiple second air vents 50 are distributed in rows along the radial direction of the main body part 10 on each main body region 14.

[0098] In the description of the present specification, the description of the terms "embodiment", "specific embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the characteristics of the different embodiments or examples without contradiction, and the equivalent changes made in accordance with the claims of the present application still belong to the scope covered by the present application.

[0099] The above disclosure is only a preferred embodiment of the present application, and of course cannot limit the scope of the rights of the present application. The person skilled in the art can understand that all or part of the above-mentioned embodiments can be implemented, and equivalent changes made in accordance with the claims of the present application still belong to the scope covered by the present application.

Claims

1. A current collector plate, characterized by, The application is applied to a cylindrical battery, the cylindrical battery comprises a shell and an electrode assembly, and the current collector plate comprises: a main body part (10) in a circular flat plate shape; at least three first protruding parts (20) uniformly distributed on the outer periphery of the main body part (10) at intervals, the first protruding part (20) is bent relative to the main body part (10), and the extension direction of the first protruding part (20) is from the outer periphery of the main body part (10) to the central axis of the main body part (10); the surface of the first protruding part (20) facing away from the central axis of the current collector plate is a bevel surface; wherein the first protruding part (20) is arranged on the side away from the electrode assembly, the first protruding part (20) is abutted at the side wall of the side opening of the shell, and the current collector plate and the electrode assembly are inserted into the shell through the bevel surface of the first protruding part (20); the main body part (10) has a first surface (11) and a second surface (12) arranged oppositely, and the first protruding part (20) is bent towards the side where the first surface (11) is located; the current collector plate further comprises a second protruding part (31), the second protruding part (31) is located on the outer periphery of the main body part (10), and the second protruding part (31) is protruded relative to the second surface (12); the current collector plate further comprises an insulating mounting member (30), the insulating mounting member (30) is sleeved on the main body part (10) and in contact with the first surface (11); the insulating mounting member (30) comprises a main plate (33) and a side wall (34), the main plate (33) is in contact with the first surface (11), the side wall (34) is arranged on the outer periphery of the main plate (33) and protruded relative to the main plate (33), the extension length of the side wall (34) in the thickness direction of the main body part (10) is greater than the thickness of the main body part (10), and the side wall (34) forms the second protruding part (31).

2. The current plate of claim 1, wherein the first protruding part (20) and the first surface (11) form a preset angle α, and the preset angle α satisfies the relationship: 60°≤α≤85°.

3. The current plate of claim 1, wherein the second protruding part (31) is perpendicular to the second surface (12).

4. The current plate of claim 3, wherein the number of the second protruding part (31) is multiple, and the multiple second protruding parts (31) are arranged at intervals along the circumference of the main body part (10).

5. The current plate of claim 4, wherein, the multiple first protruding parts (20) and the multiple second protruding parts (31) are alternately distributed at intervals along the circumference of the main body part (10).

6. The current plate of claim 1, wherein the second protruding part (31) is in a continuous ring shape.

7. The current plate of claim 1, wherein the number of the insulating mounting member (30) is multiple, the insulating mounting member (30) is in a circular arc shape, and each insulating mounting member (30) is sleeved on part of the outer periphery of the main body part (10).

8. The current plate of claim 4, wherein, the main body part (10) is recessed with a groove area (13), and the groove area (13) extends from the central axis of the main body part (10) to the edge of the main body part (10).

9. The current plate of claim 8, wherein, The plurality of groove regions (13) are evenly spaced along the circumference of the main body (10) to divide the main body (10) into a plurality of main body regions (14).

10. The current plate of claim 9, wherein, Each of the main body regions (14) comprises at least one first protrusion (20) and at least one second protrusion (31).

11. The current plate of claim 10, wherein, The number of the groove regions (13) is three, and the number of the second protrusions (31) is at least three.

12. The current plate of claim 9, wherein, The plurality of insulating mounting members (30) are provided on the outer periphery of the plurality of main body regions (14) one-to-one.

13. The current plate of claim 12, wherein, Any two adjacent insulating mounting members (30) have one groove region (13) therebetween, and the distance between the two adjacent insulating mounting members (30) is greater than the width of the groove region (13).

14. The current plate of any one of claims 1-7, 12, and 13, wherein, The insulating mounting member (30) comprises a clearance hole (32) for exposing the first protrusion (20).

15. The current plate of claim 1, wherein, The main body (10) is provided with a notch (21) on both sides of each of the first protrusions (20) and each of the second protrusions (31).

16. The current plate of claim 1, wherein, The end of the first protrusion (20) away from the main body (10) is arc-shaped.

17. An end cap assembly characterized by, The current collecting plate according to any one of claims 1 to 16 is connected to a cover plate.

18. An energy storage device, characterized by, The current collecting plate according to any one of claims 1 to 16 is connected to a cover plate. The housing has openings on both sides in the length direction; The electrode assembly is accommodated in the space surrounded by the housing; The end cover assembly according to claim 17, wherein the current collecting plate of the end cover assembly is fixedly connected to the electrode assembly, the current collecting plate is accommodated in the space surrounded by the housing, the cover plate of the end cover assembly is connected to the housing to close the first side opening of the housing, and the first protrusion of the current collecting plate is used to abut against the side wall of the second side opening of the housing to assemble the current collecting plate and the electrode assembly into the space surrounded by the housing. The energy storage device according to claim 18 is used to supply power to the electric device.

19. An electrical device, comprising: ​

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