Current collecting components, energy storage devices and electrical equipment

Abstract

The present application provides a current collecting assembly, an energy storage device and an electrical device. The current collecting assembly includes a cover plate, an explosion-proof valve and a current collecting plate. The cover plate includes a main body and a first stopper. The explosion-proof valve is arranged on the main body. The current collecting plate includes a main body and a first protrusion, the main body is arranged opposite to the main body, the main body is provided with a welding groove and a vent hole outside the welding groove; the first protrusion is fixedly connected to the main body, and is used to stop with the first stopper, so as to limit the movement of the first protrusion along the circumferential direction of the current collecting assembly through the first stopper, and make the welding groove at least partially arranged opposite to the explosion-proof valve part along the axial direction of the current collecting assembly, so that when the energy storage device is impacted by external force, the electrolyte will be stopped by the welding groove, and the electrolyte will not directly impact the explosion-proof valve, thereby avoiding the explosion-proof valve from being triggered by mistake.

Description

Technical Field

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

[0002] As environmental issues become increasingly prominent, low-carbon economy has become the mainstream of future economic development. The increasingly severe air situation has further promoted the rise and development of energy storage devices. Energy storage devices with high energy density, high power density, high number of cycles and long storage time have become the key to solving global problems such as energy crisis and environmental pollution.

[0003] Usually, in order to ensure the safety of the energy storage device, an explosion-proof valve is provided on the cover plate of the energy storage device. When an unexpected situation occurs in the energy storage device (such as overcharging, thermal runaway, shell damage, etc.), a large amount of gas will be generated inside the energy storage device, and the internal pressure of the energy storage device will increase. When the internal pressure of the energy storage device is greater than a predetermined value, the internal gas will break open the explosion-proof valve, thereby reducing the internal pressure of the energy storage device, thereby ensuring the safety of the energy storage device. However, when an existing energy storage device is impacted by an external force (such as an accidental fall), the electrolyte inside the energy storage device will directly impact the explosion-proof valve upward, causing the explosion-proof valve to be triggered incorrectly, thereby resulting in poor reliability and a short service life of the energy storage device. Summary of the invention

[0004] The embodiments of the present application provide a current collecting assembly, an energy storage device, and an electrical equipment to solve the problem that explosion-proof valves are easily triggered by mistake.

[0005] In a first aspect, the present application provides a current collecting assembly, which includes a cover plate, an explosion-proof valve and a current collecting plate. The cover plate includes a main body and a first stopper connected to the main body. The explosion-proof valve is arranged on the main body. The current collecting plate includes a main body and a first protrusion, the main body is arranged opposite to the main body, the main body is provided with a welding groove and a vent hole located outside the welding groove; the first protrusion is fixedly connected to the main body, and is used to stop with the first stopper, so as to limit the movement of the first protrusion along the circumferential direction of the current collecting assembly through the first stopper, and make the welding groove at least partially arranged opposite to the explosion-proof valve along the axial direction of the current collecting assembly.

[0006] In combination with the first aspect, in certain implementations of the first aspect, a first limiting space is formed between the first stop portion and the main body portion, the first protrusion portion extends from the main body portion toward the main body portion, and one end of the first protrusion portion away from the main body portion is located in the first limiting space, and is spaced apart from the main body portion and the first stop portion, respectively, so that the part of the main body portion corresponding to the welding groove and the part of the main body portion corresponding to the explosion-proof valve are arranged relative to each other.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the orthographic projection of the welding groove along the axial direction of the current collecting assembly overlaps with the orthographic projection of the explosion-proof valve along the axial direction of the current collecting assembly, the area of ​​the overlapping area of ​​the orthographic projection of the welding groove and the orthographic projection of the explosion-proof valve is a first area, the area of ​​the orthographic projection of the explosion-proof valve is a second area, and the ratio of the first area to the second area is 0.8-1, thereby avoiding direct impact of the electrolyte on the explosion-proof valve, causing the explosion-proof valve to be erroneously triggered.

[0008] In combination with the first aspect, in certain implementations of the first aspect, the orthographic projection of the vent hole on the main body is located outside the orthographic projection of the explosion-proof valve on the main body, so that the electrolyte cannot directly impact the explosion-proof valve, thereby further avoiding the explosion-proof valve from being triggered incorrectly.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the first stop portion is configured as a first limiting groove opened in the main body, and the first limiting space is formed in the first limiting groove; the first protrusion extends into the first limiting groove at one end away from the main body, and is spaced apart from the groove wall of the first limiting groove, thereby reducing the axial length of the current collecting assembly and making the structure of the energy storage device more compact.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the first stop portion is configured as a first stop protrusion and a second stop protrusion protruding from the side of the main body portion facing the main body portion, the first stop protrusion and the second stop protrusion are spaced apart along the circumferential direction of the current collecting assembly, and the first limiting space is formed between the first stop protrusion, the second stop protrusion and the main body portion; along the circumferential direction of the current collecting assembly, the first protrusion is located between the first stop protrusion and the second stop protrusion, and is spaced apart from the first stop protrusion and the second stop protrusion, respectively, thereby reducing the processing difficulty of the first stop portion and avoiding reducing the structural strength of the main body portion.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the first stop portion also includes a third stop protrusion protruding from the side of the main body portion toward the body portion, and the third stop protrusion is respectively connected to the first stop protrusion and the second stop protrusion at both ends along the circumferential direction of the current collecting assembly, and the third stop protrusion is located on the side of the first protrusion portion away from the center of the main body portion, and is spaced apart from the first protrusion portion, and the third stop protrusion is used to limit the movement of the first protrusion portion along the radial direction of the current collecting assembly, so that when the energy storage device is overcharged, thermally runaway or mechanically vibrates, the third stop protrusion can limit the first protrusion portion from folding in a direction away from the center of the main body portion and pressing against the outer shell, thereby avoiding the problem of unreliable welding at the welding seal between the cover plate and the outer shell, thereby ensuring the welding yield at the welding seal and extending the service life of the energy storage device.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the central angle corresponding to the circumferential length of the first stop portion along the circumferential direction of the current collecting assembly is 5°-20°; the radial length of the first stop portion along the radial direction of the current collecting assembly is 0.3mm-3.5mm; the axial length of the first stop portion along the axial direction of the current collecting assembly is 1.5mm-3.5mm; along the axial direction of the current collecting assembly, the axial length of the first protrusion extending into the first limiting space is 0.5mm-2.54mm, thereby facilitating the first protrusion to extend into the first limiting space, and further facilitating the installation of the current collecting plate and the cover plate, and making the welding groove at least partially arranged relative to the explosion-proof valve.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the circumferential length of the first stop portion along the circumferential direction of the current collecting assembly is 4.5 mm-7.5 mm, thereby facilitating the first protrusion to extend into the first limiting space, thereby facilitating the installation of the collecting plate and the cover plate.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the first protrusion is movable in the first limiting space, thereby facilitating the first protrusion to extend into the first limiting space, thereby facilitating the installation of the collecting plate and the cover plate.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the first protrusion is fixedly connected to the first stop portion, so that on the one hand, the first protrusion is fixedly connected to the first stop portion, so that when the cover plate and the outer shell are welded, the collecting plate can fix and roughly position the cover plate, so that the cover plate and the outer shell can be better welded; on the one hand, it can avoid the first protrusion and the groove wall of the first limiting groove from scratching to generate metal debris; on the other hand, it can enable the welding groove and the explosion-proof valve to be better aligned.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the first stop portion is configured as a first limiting groove opened on the main body, the first limiting groove is provided with a clamping hole along the side wall of the current collecting assembly in the circumferential direction, and the first protrusion is provided with a buckle for engaging with the clamping hole along the side wall of the current collecting assembly in the circumferential direction, thereby fixing the first protrusion to the first stop portion.

[0017] In combination with the first aspect, in certain implementations of the first aspect, an end of the first protrusion away from the main body is spaced apart from the main body to avoid scratches between the first protrusion and the main body to generate metal debris when installing the collecting plate and the cover plate.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the first protrusion is located at the outer peripheral edge of the main body, and bending grooves are provided on both sides of the first protrusion along the circumferential direction of the current collecting assembly, and the bending grooves are opened along the radial direction of the main body to avoid cracks at the connection between the first protrusion and the main body when the first protrusion is bent, thereby improving the connection strength between the first protrusion and the main body.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the current collecting assembly also includes an insulating member, the first stop portion has a stop surface arranged toward the first protrusion, and the insulating member is located between the first protrusion and the stop surface. On the one hand, it avoids the first protrusion and the first stop portion from directly contacting each other to cause scratches and generate debris, thereby causing a short circuit; on the other hand, the insulating member can also absorb the bending deformation of the first protrusion, thereby avoiding the problem of the first protrusion crushing the outer shell.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the insulating part includes an isolating portion located within the first limiting space and a bending portion located outside the first limiting space, and in the radial direction of the current collecting assembly, a welding portion is convexly provided on the outer periphery of the main body, one end of the bending portion is connected to the isolating portion, and the other end extends toward the welding portion and is located between the welding portion and the first protruding portion, thereby avoiding scratches and debris between the outer shell and the main body when the outer shell and the cover plate are assembled, thereby causing a short circuit.

[0021] In combination with the first aspect, in certain implementations of the first aspect, along the radial direction of the current collecting assembly, the bent portion extends to the welding portion, and a receiving groove is provided at one end of the bent portion close to the welding portion, and the opening direction of the receiving groove is set toward the main body. The receiving groove is used to receive welding chips generated when the outer shell is welded to the welding portion, thereby improving the safety of the energy storage device.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the cover plate also includes a second stop portion, and a second limiting space is formed between the second stop portion and the main body; the current collecting plate also includes a second protrusion fixedly connected to the main body, and the second protrusion is spaced apart from the first protrusion; one end of the second protrusion away from the main body is located in the second limiting space, and the second stop portion limits the movement of the second protrusion along the radial direction of the current collecting assembly, so that when the energy storage device is overcharged, thermally runaway or mechanically vibrates, the second stop portion can limit the second protrusion from folding in a direction away from the center of the main body.

[0023] In combination with the first aspect, in certain implementations of the first aspect, the second stop portion is configured as a second limit groove opened from the side of the main body toward the main body in a direction away from the main body, and the second limit space is formed in the second limit groove; one end of the second protrusion away from the main body extends into the second limit groove; or, the second stop portion is configured as a fourth stop protrusion and a fifth stop protrusion protruding from the side of the main body toward the main body, the fourth stop protrusion and the fifth stop protrusion are spaced apart along the circumferential direction of the current collecting assembly, and the second limit space is formed between the fourth stop protrusion, the fifth stop protrusion and the main body; along the circumferential direction of the current collecting assembly, the second protrusion is located between the fourth stop protrusion and the fifth stop protrusion, thereby reducing the axial length of the current collecting assembly, making the structure of the energy storage device more compact, or reducing the processing difficulty of the first stop portion, and avoiding reducing the structural strength of the main body.

[0024] In combination with the first aspect, in certain implementations of the first aspect, a plurality of second protrusions are provided; along the circumferential direction of the current collecting assembly, the first protrusion is located between two adjacent second protrusions, thereby enhancing the structural strength of the main body and preventing the main body from being accidentally bent during transportation or installation.

[0025] In a second aspect, the present application provides an energy storage device, which includes a shell and a current collecting assembly as described in any one of the above items, wherein the cover plate is fixedly connected to the shell, and the current collecting plate is accommodated in the shell.

[0026] In a third aspect, the present application provides an electrical device, wherein the electrical device comprises the energy storage device described in any one of the above embodiments, and the energy storage device provides electrical energy for the electrical device.

[0027] In the current collecting assembly, energy storage device and electrical equipment provided by the present application, the first stopper is used to limit the movement of the first protrusion along the circumferential direction of the current collecting assembly, and the welding groove is at least partially arranged relative to the explosion-proof valve along the axial direction of the current collecting assembly. In this way, in the current collecting assembly, energy storage device and electrical equipment provided by the present application, on the one hand, when the energy storage device is impacted by external force (such as accidental falling), the electrolyte inside the energy storage device will be stopped by the welding groove on the main body, and the electrolyte will not directly impact the explosion-proof valve on the main body, thereby avoiding the explosion-proof valve from being triggered by mistake, thereby improving the reliability and service life of the energy storage device; on the other hand, when the energy storage device encounters an unexpected situation (such as overcharging, thermal runaway, shell damage, etc.), the gas generated inside the energy storage device can reach the position of the explosion-proof valve through the vent hole on the main body, so that the explosion-proof valve can be triggered, thereby ensuring the safety of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 This is a household energy storage scenario diagram of the energy storage device provided in an embodiment of the present application.

[0030] Figure 2 It is an exploded diagram of the energy storage device provided in an embodiment of the present application.

[0031] Figure 3 It is a schematic diagram of the structure of the current collecting assembly provided in the first embodiment of the present application.

[0032] Figure 4 yes Figure 3 Exploded view of the current collector component in .

[0033] Figure 5 yes Figure 3 Schematic diagram of the structure of the middle cover.

[0034] Figure 6 yes Figure 3 Schematic diagram of the structure of the central collecting plate.

[0035] Figure 7 It is a schematic diagram of the orthographic projection of the explosion-proof valve and the welding groove along the axial direction of the current collecting assembly provided in the embodiment of the present application.

[0036] Figure 8 yes Figure 3 Cross-sectional view of the current collecting assembly along line AA.

[0037] Fig. 9 yes Figure 8 Enlarged view of part I.

[0038] Fig.10 It is a cross-sectional view of the buckle and the hole provided in some embodiments of the present application.

[0039] Fig.11 yes Figure 3 Cross-sectional view of the current collecting assembly along line BB.

[0040] Fig.12 yes Fig.11 Enlarged view of part II.

[0041] Fig.13 It is a schematic diagram of the structure of the current collecting assembly provided in the second embodiment of the present application.

[0042] Fig.14 yes Fig.13 Schematic diagram of the structure of the middle cover.

[0043] Fig.15 yes Fig.13 Schematic diagram of the structure of the central collecting plate.

[0044] Fig.16 yes Fig.13 Cross-sectional view of the current collecting assembly along line CC.

[0045] Fig.17 yes Fig.16 Enlarged view of point III in the middle.

[0046] Fig.18 It is a cross-sectional view of the current collecting assembly of the energy storage device provided in the third embodiment of the present application.

[0047] Fig.19 It is a cross-sectional view of the current collecting assembly of the energy storage device provided in the fourth embodiment of the present application.

[0048] Main component symbols: energy storage device 1000; power conversion device 2000; street lamp 410; household appliance 420; current collecting assembly 100; current collecting assembly 200; current collecting assembly 300; current collecting assembly 400; housing 110; opening 111; electrode assembly 120; receiving cavity 130; cover plate 10; main body 12; welding part 121; first chamfer structure 122; explosion-proof valve 13; first stopper 14; first limit Positioning space 1401; stop surface 1402; first limiting groove 141; first stopping wall 1411; second stopping wall 1412; third stopping wall 1413; first bottom wall 1414; first stopping protrusion 1421; second stopping protrusion 1422; third stopping protrusion 1423; clamping hole 15; second stopping portion 16; second limiting space 1601; second limiting groove 161; fourth stopping wall 1611; second bottom wall 1612 ; Fourth stop protrusion 1621; Fifth stop protrusion 1622; Sixth stop protrusion 1623; Collecting plate 30; Main body 32; Welding groove 321; Vent 322; First protrusion 34; Bending groove 341; Buckle 35; Second protrusion 36; Insulator 40; Isolation portion 41; Bending portion 42; Second chamfered structure 43; Receiving groove 401; First area S1; Second area S2; Center angle φ1; Center angle φ2; Center angle φ3; Radial length W1; Radial length W2; Radial length W3; Radial length W4; Radial length R1; Axial length H1; Axial length H2; Axial length H4; Axial length H5; Axial length H7; Axial length H8; Overlap length H3; Overlap length H10; Axial distance H6; Axial distance H9; Circumferential length L1; Circumferential length L2; First gap D1; Second gap D2; Third gap D3.

[0049] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments in the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] Reference to "embodiment" or "implementation" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] It should be noted that the terms in the specification and claims of this application and the above-mentioned drawings are only for describing specific embodiments and are not intended to limit this application. The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. The term "and / or" used in the specification and claims of this application refers to any combination of one or more of the associated listed items and all possible combinations, including these combinations.

[0053] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, in order to achieve the goal of carbon neutrality, the main way to generate green electricity is to develop green energy such as photovoltaics and wind power to replace fossil energy. At present, the generation of green electricity generally relies on photovoltaics, wind power, water potential, etc., while wind and solar energy generally have strong intermittent and volatile problems, which will cause instability in the power grid, insufficient electricity during peak hours, too much electricity during low hours, and unstable voltage will also cause damage to electricity. Therefore, insufficient electricity demand or insufficient grid acceptance capacity may cause the problem of "abandoning wind and light". To solve these problems, energy storage must be relied on. That is, electrical energy is converted into other forms of energy through physical or chemical means and stored, and then the energy is converted into electrical energy and released when needed. Simply put, energy storage is like a large "power bank". When photovoltaic and wind energy are sufficient, electrical energy is stored, and the stored electricity is released when needed.

[0054] Taking electrochemical energy storage as an example, this solution provides an energy storage device 1000, which is equipped with a chemical battery. The chemical elements in the chemical battery are mainly used as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage medium. Simply put, the electricity generated by wind energy and solar energy is stored in the chemical battery. When the use of external electricity reaches a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0055] At present, energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage. The corresponding types of energy storage devices 1000 include:

[0056] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0057] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage equipment during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0058] The present application embodiment takes the household energy storage scenario in the user side energy storage as an example to illustrate. Figure 1 This is a diagram of a household energy storage scenario of the energy storage device 1000 provided in an embodiment of the present application. The energy storage device 1000 of the present application is not limited to household energy storage scenarios.

[0059] The present application provides a household energy storage system, which includes an energy conversion device 2000, a user load and an energy storage device 1000. Among them, the energy conversion device 2000 can be a photovoltaic panel. The user load is an electrical device, and the energy storage device 1000 provides electrical energy for the electrical device. The user load can be a street lamp 410, a household appliance 420, etc. The energy storage device 1000 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the photovoltaic panel can convert solar energy into electrical energy during the period of low electricity prices, and the energy storage device 1000 is used to store the electrical energy and supply the street lamp 410 and the household appliance 420 for use during the peak electricity price, or to supply power when the power grid is off / power outage.

[0060] It is understandable that the energy storage device 1000 may include but is not limited to a single cell, a battery module, a battery pack, a battery system, etc. When the energy storage device 1000 is a single cell, it may be a cylindrical battery.

[0061] See also Figure 2 , Figure 2: is an exploded view of the energy storage device 1000 provided in an embodiment of the present application. The energy storage device 1000 includes a housing 110, an electrode assembly 120 and a current collecting assembly 100. The housing 110 has an opening 111, and the current collecting assembly 100 is arranged at the opening 111 and covers the opening 111. The current collecting assembly 100 is sealed and fixedly connected to the housing 110, and is enclosed with the housing 110 to form a receiving cavity 130. The electrode assembly 120 is received in the receiving cavity 130. The current collecting assembly 100 includes a cover plate 10, an explosion-proof valve 13, and a current collecting disc 30. The cover plate 10 covers the opening 111. The explosion-proof valve 13 is arranged on the cover plate 10. The current collecting disc 30 is received in the receiving cavity 130, and the current collecting disc 30 is located between the electrode assembly 120 and the cover plate 10. It can be understood that the receiving cavity 130 also contains an electrolyte, and the electrolyte infiltrates the electrode assembly 120.

[0062] It should be noted that Figure 2 The purpose is only to schematically describe the arrangement of the current collecting assembly 100, the housing 110 and the electrode assembly 120, and it is not to specifically limit the connection position, connection relationship and specific structure of each component. Figure 2 The structure of the energy storage device 1000 is only shown in the embodiment of the present application, and does not constitute a specific limitation on the energy storage device 1000. In other embodiments of the present application, the energy storage device 1000 may include Figure 2 More or fewer components, or a combination of certain components, or different components, such as the energy storage device 1000 may also include but are not limited to seals, tabs, and the like.

[0063] It should be noted that the term "axial direction X" used in the embodiments and claims herein refers to a direction parallel to the central axis P of the energy storage device 1000. The term "radial direction Y" refers to a direction perpendicular to the central axis P of the energy storage device 1000, that is, a radial direction along the cross section of the energy storage device 1000. The term "circumferential direction Z" refers to the circumferential direction of the energy storage device 1000, that is, a direction surrounding the central axis P of the energy storage device 1000, wherein the axial direction X, the radial direction Y and the circumferential direction Z together constitute three orthogonal directions of the energy storage device 1000. The axial direction of the current collecting assembly 100 is parallel to the axial direction X, the radial direction of the current collecting assembly 100 is parallel to the radial direction Y, and the circumferential direction of the current collecting assembly 100 is parallel to the circumferential direction Z.

[0064] Please also read Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 3 is a schematic structural diagram of a current collecting assembly 100 provided in the first embodiment of the present application; Figure 4 yes Figure 3An exploded view of the middle current collecting assembly 100; Figure 5 yes Figure 3 A schematic structural diagram of the middle cover plate 10;

[0065] Figure 6 yes Figure 3 Schematic diagram of the structure of the collecting plate 30. The cover plate 10 includes a main body 12 and a first stopper 14 connected to the main body 12. The explosion-proof valve 13 is arranged on the main body 12. A first limiting space 1401 is formed between the main body 12 and the first stopper 14. The collecting plate 30 includes a main body 32 and a first protrusion 34. The main body 32 is arranged opposite to the main body 12. The main body 32 is provided with a welding groove 321 and a vent hole 322 located outside the welding groove 321. The first protrusion 34 is fixedly connected to the main body 32, and the first protrusion 34 extends from the main body 32 toward the main body 12 (i.e., in a direction away from the main body 32). One end of the first protrusion 34 away from the main body 32 (i.e., the end of the first protrusion 34) is located in the first limiting space 1401, and the first protrusion 34 is spaced from the main body 12 and the first stopper 14. The first protrusion 34 is used to stop with the first stopper 14, so as to limit the movement of the first protrusion 34 along the circumferential direction of the current collecting assembly 100 through the first stopper 14, and make the welding groove 321 at least partially arranged relative to the main body 12 along the axial direction of the current collecting assembly 100, so that when the energy storage device 1000 is impacted by external force (such as accidental drop), the electrolyte inside the energy storage device 1000 will be stopped by the welding groove 321 on the main body 32, and the electrolyte will not directly impact the main body 12. The explosion-proof valve 13 on the body 12 causes direct impact, thereby preventing the explosion-proof valve 13 from being triggered by mistake, thereby improving the reliability and service life of the energy storage device 1000. On the other hand, when the energy storage device 1000 encounters an unexpected situation (such as overcharging, thermal runaway, shell damage, etc.), the gas generated inside the energy storage device 1000 can reach the position of the explosion-proof valve 13 through the vent hole 322 on the main body 32, so that the explosion-proof valve 13 can be triggered, thereby ensuring the safety of the energy storage device 1000. It should be noted that when the energy storage device 1000 is in normal use, the first protrusion 34 is spaced from the main body 12 and the first stopper 14, respectively. When the energy storage device 1000 is impacted by external force, the first stopper 14 can stop with the first protrusion 34 to limit the movement of the first protrusion 34 along the circumferential direction of the current collecting assembly 100.

[0066] See also Figure 7 , Figure 7It is a schematic diagram of the orthographic projection of the explosion-proof valve 13 and the welding groove 321 along the axial direction of the current collecting assembly 100 provided in the embodiment of the present application. The orthographic projection of the welding groove 321 along the axial direction of the current collecting assembly 100 overlaps with the orthographic projection of the explosion-proof valve 13 along the axial direction of the current collecting assembly 100. The area of ​​the overlapping area of ​​the orthographic projection of the welding groove 321 and the orthographic projection of the explosion-proof valve 13 is the first area S1, the orthographic projection area of ​​the explosion-proof valve 13 is the second area S2, and the ratio of the first area S1 to the second area S2 is 0.3-1. It can be understood that when the energy storage device 1000 is impacted by an external force (such as an accidental fall), the electrolyte in the energy storage device 1000 will impact the explosion-proof valve 13 under the action of inertia. When the impact force of the electrolyte is greater than the opening pressure of the explosion-proof valve 13, the explosion-proof valve 13 will be opened by the electrolyte, thereby causing the explosion-proof valve 13 to be triggered incorrectly. In the present application, based on the fact that at least part of the welding groove 321 is arranged relative to the main body 12 along the axial direction of the current collecting assembly 100, and the ratio of the first area S1 to the second area S2 is 0.3-1, on the one hand, the shielding degree of the welding groove 321 for the explosion-proof valve 13 in the axial direction of the current collecting assembly 100 can be in the best state. When the energy storage device 1000 is impacted by external force (such as accidental falling), the welding groove 321 can stop and buffer the electrolyte, thereby reducing the impact force of the electrolyte on the explosion-proof valve 13, thereby preventing the explosion-proof valve 13 from being opened by the electrolyte and being triggered incorrectly; on the other hand, when the energy storage device 1000 encounters an unexpected situation (such as overcharging, thermal runaway, shell damage, etc.), the gas generated in the energy storage device 1000 can quickly reach the position of the explosion-proof valve 13 through the vent 322 and open the explosion-proof valve 13, so that the explosion-proof valve 13 is normally triggered, thereby ensuring the safety of the energy storage device 1000.

[0067] It is understandable that the specific ratio of the first area S1 to the second area S2 can be specifically set according to actual needs, and is not specifically limited in the present application. For example, the ratio of the first area S1 to the second area S2 may be associated with factors such as the opening pressure of the explosion-proof valve 13 and the density of the electrolyte. For example, when the opening pressure of the explosion-proof valve 13 is large and the density of the electrolyte is small, those skilled in the art may reduce the ratio of the first area S1 to the second area S2. When the opening pressure of the explosion-proof valve 13 is small and the density of the electrolyte is large, those skilled in the art may increase the ratio of the first area S1 to the second area S2. In some embodiments, the ratio of the first area S1 to the second area S2 may be 0.3, 0.4, 0.5, 0.7, 0.8, 0.9, 1, and the like.

[0068] In this embodiment, along the axial direction of the current collecting assembly 100, the orthographic projection of the vent hole 322 on the main body 12 is located outside the orthographic projection of the explosion-proof valve 13 on the main body 12, so that the explosion-proof valve 13 and the electrode assembly 120 are completely blocked, so that the electrolyte cannot directly impact the explosion-proof valve 13, so as to further prevent the explosion-proof valve 13 from being triggered by mistake. In some embodiments, a through hole can be opened on the welding groove 321, and the through hole is opened along the axial direction of the current collecting assembly 100 and passes through the main body 32. The through hole can provide a flow path for the electrolyte and the gas to improve the filling efficiency of the electrolyte, thereby improving the production efficiency of the energy storage device 1000, and when an accident occurs in the energy storage device 1000, the gas can reach the explosion-proof valve 13 faster. Among them, along the axial direction of the current collecting assembly 100, the orthographic projection of the through hole on the main body 12 can be located outside the orthographic projection of the explosion-proof valve 13 on the main body 12.

[0069] Please also read Figure 3 , Figure 4 , Figure 5 and Figure 6, the first stopper 14 is configured as a first limiting groove 141 provided in the main body 12. A first limiting space 1401 is formed in the first limiting groove 141. The first protrusion 34 extends from the main body 32 toward the main body 12, and one end of the first protrusion 34 away from the main body 32 extends into the first limiting groove 141. The first protrusion 34 is spaced apart from the groove wall of the first limiting groove 141, that is, the first protrusion 34 is spaced apart from the main body 12. The first limiting groove 141 is used to limit the movement of the first protrusion 34 along the circumferential direction of the current collecting assembly 100, so that at least part of the welding groove 321 is arranged opposite to the explosion-proof valve 13 along the axial direction of the current collecting assembly 100. The first limiting groove 141 is formed by a concave surface from the main body 12 toward one side of the main body 32, thereby reducing the axial length of the current collecting assembly 100 and making the structure of the energy storage device 1000 more compact. The first limiting groove 141 includes a first stop wall 1411 and a second stop wall 1412 which are arranged opposite to each other along the circumference of the current collecting assembly 100. The first stop wall 1411, the second stop wall 1412 and the main body 12 are enclosed together to form a first limiting space 1401. Along the circumferential direction of the current collecting assembly 100, the first protrusion 34 is located between the first stop wall 1411 and the second stop wall 1412. The first protrusion 34 is spaced from the first stop wall 1411 and the second stop wall 1412 to avoid the problem of metal debris being generated by the first protrusion 34 and the first stop wall 1411 or the second stop wall 1412 when the current collecting plate 30 and the cover plate 10 are installed, thereby causing a short circuit. The first stop wall 1411 and the second stop wall 1412 are used to limit the movement of the first protrusion 34 along the circumferential direction of the current collecting assembly 100, so that the welding groove 321 is at least partially arranged relative to the main body 12 along the axial direction of the current collecting assembly 100, and the ratio of the first area S1 to the second area S2 is 0.3-1.

[0070] In this embodiment, the first stopper 14 and the first protrusion 34 are respectively provided in plurality, and the number of the first stopper 14 corresponds to the number of the first protrusion 34. The plurality of first stoppers 14 are arranged at intervals along the circumference of the main body 12, and the plurality of first protrusions 34 are arranged at intervals along the circumference of the main body 32, so that the first protrusions 34 can evenly support the surroundings of the main body 32, and facilitate the installation of the collecting plate 30 and the cover plate 10.

[0071] In this embodiment, the first protrusion 34 is located at the outer peripheral edge of the body 32. The first protrusion 34 and the body 32 can be integrally formed, and the first protrusion 34 can be configured as a folding structure that bends from the outer peripheral edge of the body 32 toward the main body 12 to facilitate the processing of the first protrusion 34. Among them, along the circumferential direction of the current collecting assembly 100, bending grooves 341 can be provided on both sides of the first protrusion 34, and the bending grooves 341 are opened along the radial direction of the body 32 to avoid cracks at the connection between the first protrusion 34 and the body 32 when the first protrusion 34 is bent, thereby improving the connection strength between the first protrusion 34 and the body 32. In some cases, the bending groove 341 can also prevent the first protrusion 34 from cracking at the connection between the body 32 when the energy storage device 1000 is overcharged, thermally runaway or subjected to mechanical vibration, thereby improving the support capacity of the first protrusion 34 for the body 32. The side wall of the bending groove 341 along the circumferential direction of the current collecting assembly 100 and the bottom wall along the axial direction of the current collecting assembly 100 may be in an arc transition to further avoid cracks at the connection between the first protrusion 34 and the main body 32. The bending groove 341 is arranged along the axial direction of the current collecting assembly 100 and penetrates the main body 32, thereby providing a flow channel for the electrolyte or gas in the energy storage device 1000 to flow, so that the electrolyte can flow into the receiving cavity 130 more quickly when the electrolyte is added, thereby improving the production efficiency of the energy storage device 1000, and when an unexpected situation occurs in the energy storage device 1000, the gas can reach the position of the explosion-proof valve 13 more quickly, thereby improving the safety of the energy storage device 1000. In some embodiments, the first protrusion 34 and the main body 32 can be manufactured separately, and the first protrusion 34 is fixedly connected to the side of the main body 32 facing the main body 12, or fixedly connected to the outer peripheral edge of the main body 32 by welding, bonding, clamping, screwing, etc.

[0072] The central angle φ1 corresponding to the circumferential length of the first stopper 14 along the circumferential direction of the current collecting assembly 100 is 5°-20°. The central angle φ1 of the first stopper 14 can be the angle formed between the first stopper wall 1411 and the second stopper wall 1412. The central angle φ2 corresponding to the circumferential length of the first protrusion 34 along the circumferential direction of the current collecting assembly 100 is 10°-15°. The central angle φ2 of the first protrusion 34 is less than or equal to the central angle φ1 of the first stopper 14. The first protrusion 34 is movable in the first limiting space 1401, so as to facilitate the first protrusion 34 to extend into the first limiting space 1401, thereby facilitating the installation of the current collecting plate 30 and the cover plate 10, and avoiding the first protrusion 34 from interfering with or scratching the first stopper 14 or the main body 12 to generate debris, thereby causing a short circuit problem. For example, in some embodiments, the central angle φ1 of the first stop portion 14 can be 5°, 10°, 15°, 20°, etc.; the central angle φ2 of the first protrusion 34 can be 10°, 11°, 12°, 13°, 14°, 15°, etc.

[0073] In this embodiment, the radial length R1 of the main body 12 along the radial direction of the current collecting assembly 100 can be 20.5mm-29.5mm. The circumferential length L1 of the first stopper 14 along the circumferential direction of the current collecting assembly 100 is 4.5mm-7.5mm. Among them, the circumferential length L1 of the first stopper 14 can be the distance between the first stopper wall 1411 and the second stopper wall 1412 along the circumferential direction of the current collecting assembly 100. The circumferential length L2 of the first protrusion 34 along the circumferential direction of the current collecting assembly 100 is 4.5mm-6mm. The circumferential length L1 of the first stopper 14 is greater than or equal to the circumferential length L2 of the first protrusion 34, so as to facilitate the first protrusion 34 to extend into the first limiting space 1401, thereby facilitating the installation of the collecting plate 30 and the cover plate 10. For example, in some embodiments, the radial length R1 of the main body 12 can be 20.5 mm, 21 mm, 25 mm, 29.5 mm, etc.; the circumferential length L1 of the first stop portion 14 can be 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, etc.; the circumferential length L2 of the first protrusion 34 can be 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc.

[0074] Please also read Figure 8 and Fig. 9 , Figure 8 yes Figure 3 A cross-sectional view of the current collecting assembly 100 along line AA; Fig. 9 yes Figure 8The first limiting groove 141 also includes a third stop wall 1413. The third stop wall 1413 is connected to the first stop wall 1411 and the second stop wall 1412 on both sides along the circumferential direction of the current collecting assembly 100. The third stop wall 1413 is located outside the first protrusion 34 away from the center of the main body 12. The center of the main body 12 is located at a position where the main body 12 is close to the central axis P of the energy storage device 1000 along the radial direction of the current collecting assembly 100. The third stop wall 1413 is used to stop the first protrusion 34 and to limit the movement of the first protrusion 34 along the radial direction of the current collecting assembly 100, so that when the energy storage device 1000 is overcharged, thermally runaway or mechanically vibrates, the third stop wall 1413 can limit the first protrusion 34 from folding in a direction away from the center of the main body 12, thereby avoiding the first protrusion 34 pressing against the shell 110 and causing unreliable welding at the welding seal between the shell 110 and the main body 12, thereby ensuring the welding yield at the welding seal and extending the service life of the energy storage device.

[0075] In this embodiment, the first protrusion 34 and the third stop wall 1413 are spaced apart to form a first gap D1. The radial length W1 of the first stop 14 along the radial direction of the current collecting assembly 100 is 0.3mm-3.5mm, the radial length W2 of the first protrusion 34 along the radial direction of the current collecting assembly 100 is 0.2mm-2mm, and the radial length of the first gap D1 along the radial direction of the current collecting assembly 100 is 0.1mm-3.3mm, so that when the energy storage device 1000 is overcharged, thermally runaway or mechanically vibrated, a certain buffer space is provided between the first protrusion 34 and the third stop wall 1413, so as to further avoid the first protrusion 34 from pressing against the housing 110, and facilitate the first protrusion 34 to extend into the first limiting groove 141, thereby improving the assembly efficiency between the cover plate 10 and the current collecting plate 30. For example, in some embodiments, the radial length W1 of the first stop portion 14 can be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc.; the radial length W2 of the first protrusion 34 can be 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc.; the radial length of the first gap D1 can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.3mm, etc.

[0076] The first limiting groove 141 also includes a first bottom wall 1414 arranged opposite to the main body 32. The first protrusion 34 is spaced apart from the first bottom wall 1414 at one end away from the main body 32 to avoid the first protrusion 34 and the main body 12 from being scratched and generating metal debris when the collector plate 30 and the cover plate 10 are installed. It can be understood that in some cases, when manufacturing the cover plate 10 and the collector plate 30, there will be differences in the axial lengths between different first limiting grooves 141, and there will be differences in the axial lengths between different first protrusions 34. After the first protrusion 34 is spaced apart from the first bottom wall 1414, the first protrusion 34 and the first limiting groove 141 can be better assembled to avoid the problem of unevenness after the collector plate 30 is installed on the cover plate 10.

[0077] The axial length H1 of the first stopper 14 along the axial direction of the current collecting assembly 100 is 1.5mm-3.5mm. Among them, the axial length H1 of the first stopper 14 can be the distance between the first bottom wall 1414 and the surface of the main body 12 on the side facing the main body 32. Along the axial direction of the current collecting assembly 100, the axial length H2 of the first protrusion 34 extending into the first limiting space 1401 is 0.2mm-2.54mm, thereby improving the connection stability between the first protrusion 34 and the first limiting groove 141 and preventing the first protrusion 34 from escaping from the first limiting groove 141. For example, in some embodiments, the axial length H1 of the first stopper 14 can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc.; the axial length H2 of the first protrusion 34 extending into the first limiting space 1401 can be 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 2.54mm.

[0078] The overlapping length H3 of the first protrusion 34 and the first stop wall 1411 or the second stop wall 1412 in the axial direction of the current collecting assembly 100 is 0.2 mm-1 mm, so as to facilitate the first protrusion 34 to stop with the first stop wall 1411 or the second stop wall 1412, and prevent the first protrusion 34 from escaping from the first limiting groove 141. For example, in some embodiments, the overlapping length H3 of the first protrusion 34 and the first stop wall 1411 or the second stop wall 1412 in the axial direction of the current collecting assembly 100 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0079] See also Fig.10 , Fig.10: is a cross-sectional view of the buckle 35 and the clamping hole 15 provided in some embodiments of the present application. In some embodiments, the first protrusion 34 is fixedly connected to the first stopper 14. The first stopper 14 is configured as a first limiting groove 141 provided in the main body 12, and a first limiting space 1401 is formed in the first limiting groove 141. The first limiting groove 141 is provided with a clamping hole 15 on the side wall along the circumferential direction of the current collecting assembly 100, and the first protrusion 34 is provided with a buckle 35 for clamping with the clamping hole 15 on the side wall along the circumferential direction of the current collecting assembly 100. Specifically, the first stopper wall 1411 or the second stopper wall 1412 of the first limiting groove 141 is provided with a clamping hole 15, and the clamping hole 15 is extended along the circumferential direction of the current collecting assembly 100. When the current collecting plate 30 and the cover plate 10 are installed, after the first protrusion 34 extends into the first limiting groove 141, the buckle 35 can be snapped into the clamping hole 15 by rotating the current collecting plate 30, so that on the one hand, the first protrusion 34 is fixedly connected with the first stopper 14, so that when the cover plate 10 and the shell 110 are welded, the current collecting plate 30 can fix and roughly position the cover plate 10, so that the cover plate 10 and the shell 110 can be better welded; on the one hand, it can prevent the first protrusion 34 from rubbing against the groove wall of the first limiting groove 141 to produce metal debris; on the other hand, it can make the welding groove 321 and the explosion-proof valve 13 better aligned. It can be understood that when the buckle 35 is buckled with the clamping hole 15, a "clang" sound is generated, so that the technicians in this field can judge whether the current collecting plate 30 and the cover plate 10 are installed in place by the sound, thereby improving the assembly efficiency of the current collecting plate 30 and the cover plate 10. In some embodiments, the buckle 35 may also be provided on other side walls of the first limiting groove 141 (eg, the third stop wall 1413 ), and the buckle 35 is provided at other positions corresponding to the first protrusion 34 .

[0080] Please also read Figure 4 , Figure 5 , Fig.11 and Fig.12 , Fig.11 yes Figure 3 A cross-sectional view of the current collecting assembly 100 along line BB; Fig.12 yes Fig.11An enlarged view of part II in the figure. In some embodiments, the cover plate 10 further includes a second stopper 16, and a second limiting space 1601 is formed between the second stopper 16 and the main body 12. The current collecting plate 30 further includes a second protrusion 36 fixedly connected to the main body 32. The second protrusion 36 is spaced apart from the first protrusion 34. One end of the second protrusion 36 away from the main body 32 is located in the second limiting space 1601. The second protrusion 36 is used to stop with the second stopper 16, so as to limit the movement of the second protrusion 36 along the radial direction of the current collecting assembly 100 by the second stopper 16, so that when the energy storage device 1000 is overcharged, thermally runaway or mechanically vibrates, the second stopper 16 can limit the second protrusion 36 from folding in a direction away from the center of the main body 12, thereby avoiding the second protrusion 36 from pressing against the shell 110 and causing the welding seal between the shell 110 and the main body 12 to have an unreliable welding problem.

[0081] The second protrusion 36 is arranged at the outer peripheral edge of the main body 32. The second protrusion 36 and the main body 32 can be integrally formed, and the second protrusion 36 can be configured as a folded edge structure bent from the outer peripheral edge of the main body 32 toward the main body 12 to facilitate the processing of the second protrusion 36. Among them, along the circumferential direction of the current collecting assembly 100, bending grooves 341 can be arranged on both sides of the second protrusion 36 to avoid cracks at the connection between the second protrusion 36 and the main body 32 when the second protrusion 36 is bent, thereby improving the connection strength between the second protrusion 36 and the main body 32. In some cases, the bending groove 341 can also prevent the second protrusion 36 from cracking at the connection between the main body 32 when the energy storage device 1000 is overcharged, thermally runaway or subjected to mechanical vibration, thereby improving the supporting capacity of the second protrusion 36 for the main body 32.

[0082] The second stopper 16 can be configured as a second limiting groove 161 provided in the main body 12, and a second limiting space 1601 is formed in the second limiting groove 161. One end of the second protrusion 36 away from the main body 32 extends into the second limiting groove 161, and is spaced apart from the groove wall of the second limiting groove 161. The second limiting groove 161 includes a fourth stopping wall 1611 located on a side of the second protrusion 36 away from the center of the main body 12. The fourth stopping wall 1611 and the second protrusion 36 can be spaced apart to form a second gap D2. The radial length W3 of the second stop portion 16 along the radial direction of the current collecting assembly 100 is 0.3mm-3.5mm, the radial length W4 of the second protrusion 36 along the radial direction of the current collecting assembly 100 is 0.2mm-2mm, and the radial length of the second gap D2 along the radial direction of the current collecting assembly 100 is 0.1mm-3.3mm. Therefore, when the energy storage device 1000 is overcharged, thermally runaway or subjected to mechanical vibration, a certain buffer space is provided between the second protrusion 36 and the fourth stop wall 1611, thereby further avoiding the second protrusion 36 from pressing against the outer shell 110, and facilitating the second protrusion 36 to extend into the second limiting groove 161, thereby improving the assembly efficiency between the cover plate 10 and the current collecting plate 30. For example, in some embodiments, the radial length W3 of the second limiting space 1601 can be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc.; the radial length W4 of the second protrusion 36 can be 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc.; the radial length of the second gap D2 can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.3mm, etc.

[0083] The second limiting groove 161 also includes a second bottom wall 1612 arranged opposite to the main body 32. The second protrusion 36 can be spaced apart from the second bottom wall 1612 to avoid the generation of metal debris due to the scratches between the second protrusion 36 and the second bottom wall 1612 when the current collecting plate 30 and the cover plate 10 are installed. The axial length H4 of the second stopper 16 along the axial direction of the current collecting assembly 100 is 0.5mm-2.5mm. Along the axial direction of the current collecting assembly 100, the axial length H5 of the second protrusion 36 extending into the second limiting space 1601 is 0.3mm-1.54mm, thereby improving the connection stability between the second protrusion 36 and the second limiting groove 161 and preventing the second protrusion 36 from coming out of the second limiting groove 161. The axial distance H6 between the second protrusion 36 and the second bottom wall 1612 can be 0.2mm-1mm. For example, in some embodiments, the axial length H4 of the second stop portion 16 can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc.; the axial length H5 of the second protrusion 36 extending into the second limiting space 1601 can be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 2.54mm, etc.; the axial distance H6 between the second protrusion 36 and the second bottom wall 1612 can be 0.2mm, 0.3mm, 0.5mm, 1mm, etc.

[0084] The second limiting groove 161 can be configured as an annular groove opened on the main body 12, so as to facilitate the processing of the second limiting groove 161. Along the axial direction of the current collecting assembly 100, the groove depth of the first limiting groove 141 is greater than the groove depth of the second limiting groove 161. The axial length H7 of the first protrusion 34 is greater than the axial length H8 of the second protrusion 36. When the current collecting plate 30 is installed on the cover plate 10, the second limiting groove 161 can guide the first protrusion 34, so as to facilitate the first protrusion 34 to extend into the first limiting groove 141. Among them, the axial length H7 of the first protrusion 34 along the axial direction of the current collecting assembly 100 is 5.5mm-8.5mm; the axial length H8 of the second protrusion 36 along the axial direction of the current collecting assembly 100 is 4.5mm-7.5mm. For example, in some embodiments, the axial length H7 of the first protrusion 34 may be 5.5 mm, 6 mm, 6.5 mm, 7 mm, 8 mm, 8.5 mm, etc.; the axial length H8 of the second protrusion 36 may be 4.5 mm, 5 mm, 5.5 mm, 6 mm, 7 mm, 7.5 mm, etc. The central angle φ3 corresponding to the circumferential length of the second protrusion 36 along the circumferential direction of the current collecting assembly 100 is 10°-15°. For example, the central angle φ3 of the second protrusion 36 may be 10°, 11°, 12°, 13°, 14°, 15°, etc. In some embodiments, the central angle φ3 corresponding to the circumferential length of the second protrusion 36 may be the same as the central angle φ2 corresponding to the circumferential length of the first protrusion 34.

[0085] Among them, the second protrusion 36 can be provided in plurality. Along the circumferential direction of the current collecting assembly 100, the first protrusion 34 is located between two adjacent second protrusions 36. For example, the first protrusion 34 can be provided in three numbers, and the second protrusion 36 can be provided in six numbers, and along the circumferential direction of the current collecting assembly 100, the second protrusions 36 are provided on both sides of each first protrusion 34. It can be understood that the body part 32 is configured as a thin sheet structure, and the structural strength of the body part 32 can be enhanced by providing a plurality of first protrusions 34 and a plurality of second protrusions 36 on the outer peripheral edge of the body part 32, so as to prevent the body part 32 from being accidentally bent during transportation or installation. It is understandable that when an unexpected situation (such as overcharging, thermal runaway, etc.) occurs in the energy storage device 1000, the electrode assembly 120 will expand. The first protrusion 34 and the second protrusion 36 provided on the main body 32 can also provide a certain buffer space between the main body 32 and the main body 12, thereby preventing the electrode assembly 120 from blocking the explosion-proof valve 13 after expansion, causing the explosion-proof valve 13 to be unable to be opened normally, thereby ensuring the safety of the energy storage device 1000. The axial distance H9 between the main body 32 and the main body 12 along the axial direction of the current collecting assembly 100 is 3.5mm-7mm. Among them, the axial length H7 of the first protrusion 34 is greater than the sum of the axial length H4 of the second limiting space 1601 and the axial distance H9 between the main body 32 and the main body 12, so that the first protrusion 34 extends into the first limiting space 1401. 3.98mm. In some embodiments, the axial distance H9 between the body portion 32 and the main body portion 12 may be 3.5 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc.

[0086] Please also read Fig.13 , Fig.14 and Fig.15 , Fig.13 is a structural schematic diagram of a current collecting assembly 200 provided in a second embodiment of the present application; Fig.14 yes Fig.13 A schematic structural diagram of the middle cover plate 10; Fig.15 yes Fig.13Schematic diagram of the structure of the current collecting plate 30. In the second embodiment, the structure of the current collecting assembly 200 is similar to that of the current collecting assembly 100 of the first embodiment. For details, please refer to the introduction of the current collecting assembly 100 of the first embodiment, which will not be repeated here. The difference is that the first stop portion 14 is configured as a first stop protrusion 1421 and a second stop protrusion 1422 protruding from the side of the main body 12 facing the main body 32, thereby reducing the processing difficulty of the first stop portion 14 and avoiding reducing the structural strength of the main body 12. The first stop protrusion 1421 and the second stop protrusion 1422 are spaced apart along the circumferential direction of the current collecting assembly 200. A first limiting space 1401 is formed between the first stop protrusion 1421, the second stop protrusion 1422 and the main body 12. Along the circumferential direction of the current collecting assembly 200, the first protrusion 34 is located between the first stop protrusion 1421 and the second stop protrusion 1422, and the first protrusion 34 is spaced apart from the first stop protrusion 1421 and the second stop protrusion 1422. The first stop protrusion 1421 and the second stop protrusion 1422 are used to limit the rotation of the first protrusion 34 along the circumferential direction of the current collecting assembly 200, so that the welding groove 321 is at least partially arranged relative to the main body 12 along the axial direction of the current collecting assembly 100, thereby preventing the explosion-proof valve 13 from being triggered by mistake when the energy storage device 1000 is impacted by external force (such as accidental falling). The circumferential length L1 of the first stop portion 14 along the current collecting assembly 100 can be the distance between the first stop protrusion 1421 and the second stop protrusion 1422 along the circumferential direction of the current collecting assembly 100. It should be noted that, when the energy storage device 1000 is in normal use, the first protrusion 34 and the first stop protrusion 1421 and the second stop protrusion 1422 are spaced apart from each other, and when the energy storage device 1000 is impacted by external force, the first stop protrusion 1421 or the second stop protrusion 1422 can stop the first protrusion 34 to limit the movement of the first protrusion 34 along the circumferential direction of the current collecting assembly 100.

[0087] The first stopper 14 also includes a third stopper protrusion 1423 protruding from the side of the main body 12 facing the main body 32. The third stopper protrusion 1423 is connected to the first stopper protrusion 1421 and the second stopper protrusion 1422 at two ends along the circumferential direction of the current collecting assembly 200. The third stopper protrusion 1423 is located on the side of the first protrusion 34 away from the center of the main body 12. The first stopper protrusion 1421, the second stopper protrusion 1422, the third stopper protrusion 1423 and the main body 12 together enclose a first limiting space 1401. The third stop protrusion 1423 is used to limit the movement of the first protrusion 34 along the radial direction of the current collecting assembly 200, so that when the energy storage device 1000 is overcharged, thermally runaway or mechanically vibrates, the third stop protrusion 1423 can limit the first protrusion 34 from folding in a direction away from the center of the main body 12 and pressing against the shell 110, thereby avoiding the first protrusion 34 pressing against the shell 110 and causing unreliable welding at the welding seal between the shell 110 and the cover plate 10, thereby ensuring the welding yield at the welding seal and extending the service life of the energy storage device 1000.

[0088] Please also read Fig.16 and Fig.17 , Fig.16 yes Fig.13 A cross-sectional view of the current collecting assembly 200 along line CC; Fig.17 yes Fig.16 Enlarged view of point III in the figure. A third gap D3 is formed between the first protrusion 34 and the main body 12, so that there is a certain buffer space between the first protrusion 34 and the main body 12, so that when the energy storage device 1000 is overcharged, thermally runaway or subjected to mechanical vibration, the expansion of the electrode assembly 120 is absorbed, and the first protrusion 34 is prevented from pressing against the housing 110, and when the collecting plate 30 and the cover plate 10 are installed, the first protrusion 34 and the main body 12 are prevented from being scratched and generating metal debris. Among them, the third gap D3 can be 0.2mm-1mm. For example, in some embodiments, the third gap D3 can be 0.2mm, 0.3mm, 0.5mm, 1mm, etc.

[0089] In the second embodiment, the overlapping length H10 between the first protrusion 34 and the first stop protrusion 1421 or the second stop protrusion 1422 in the axial direction of the current collecting assembly 200 may be the same as the axial length H2 of the first protrusion 34 extending into the first limiting space 1401 in the first embodiment, or the same as the overlapping length H3 between the first protrusion 34 and the first stop wall 1411 or the second stop wall 1412 in the axial direction of the current collecting assembly 100.

[0090] The first protrusion 34 and the third stop protrusion 1423 may be spaced apart so that when the energy storage device 1000 is overcharged, thermally runaway, or mechanically vibrated, there is a certain buffer space between the first protrusion 34 and the third stop protrusion 1423, thereby further preventing the first protrusion 34 from pressing against the housing 110, and facilitating the first protrusion 34 to extend into the first limiting space 1401, thereby improving the assembly efficiency between the cover plate 10 and the current collecting plate 30. The spacing distance between the first protrusion 34 and the third stop protrusion 1423 may be the same as the radial length of the first gap D1 formed between the first protrusion 34 and the third stop wall 1413 in the first embodiment.

[0091] In some embodiments, the second stopper 16 may be configured as a fourth stopper protrusion 1621 and a fifth stopper protrusion 1622 protruding from the side of the main body 12 facing the body 32. The fourth stopper protrusion 1621 and the fifth stopper protrusion 1622 are arranged at intervals along the circumferential direction of the current collecting assembly 200, and a second limiting space 1601 is formed between the fourth stopper protrusion 1621, the fifth stopper protrusion 1622 and the main body 12. Along the circumferential direction of the current collecting assembly 200, the second protrusion 36 is located between the fourth stopper protrusion 1621 and the fifth stopper protrusion 1622, and the second protrusion 36 is arranged at intervals from the fourth stopper protrusion 1621 and the fifth stopper protrusion 1622. The fourth stop protrusion 1621 and the fifth stop protrusion 1622 are used to limit the rotation of the second protrusion 36 along the circumferential direction of the current collecting assembly 200, so that the welding groove 321 and the main body 12 are arranged relative to each other along the axial direction of the current collecting assembly 100, thereby preventing the explosion-proof valve 13 from being triggered by mistake when the energy storage device 1000 is subjected to external force impact (such as accidental fall). In some embodiments, the second stopper 16 also includes a sixth stop protrusion 1623 convexly arranged on the side of the main body 12 facing the main body 32. The two ends of the sixth stop protrusion 1623 along the circumferential direction of the current collecting assembly 200 are respectively connected to the fourth stop protrusion 1621 and the fifth stop protrusion 1622. The sixth stop protrusion 1623 is located on the side of the second protrusion 36 away from the center of the main body 12, and is spaced apart from the second protrusion 36. The sixth stop protrusion 1623 is used to limit the movement of the second protrusion 36 in the radial direction of the current collecting assembly 200, so that when the energy storage device 1000 is overcharged, thermally runaway or mechanically vibrates, the sixth stop protrusion 1623 can limit the second protrusion 36 from folding in a direction away from the center of the main body 12, thereby avoiding the second protrusion 36 pressing against the shell 110 and causing unreliable welding at the welding seal between the shell 110 and the main body 12.

[0092] The structure of the second stopper 16 may be similar to that of the first stopper 14 in the second embodiment, thereby facilitating the processing of the second stopper 16. The structure of the second protrusion 36 may be similar to that of the first protrusion 34 in the second embodiment, thereby facilitating the processing of the first protrusion 34 and the second protrusion 36, and reducing the processing steps of the current collecting plate 30. In the second embodiment, the specific structural parameters of the first protrusion 34 and the second protrusion 36 may be the same as the structural parameters of the second protrusion 36 or the first protrusion 34 in the first embodiment.

[0093] See also Figure 1 , Fig. 9 and Fig.18 , Fig.18 It is a cross-sectional view of the current collecting assembly 300 of the energy storage device 1000 provided in the third embodiment of the present application. In the third embodiment, the structure of the current collecting assembly 300 is similar to the structure of the current collecting assembly 100 of the first embodiment. For details, please refer to the introduction of the current collecting assembly 100 of the first embodiment, which will not be repeated here. The difference is that the current collecting assembly 300 also includes an insulating member 40. The first stop portion 14 has a stop surface 1402 arranged toward the first protrusion 34. The insulating member 40 is located between the first protrusion 34 and the stop surface 1402. Thus, on the one hand, the first protrusion 34 is prevented from directly contacting with the first stop portion 14 to cause scratches and generate debris, thereby causing a short circuit; on the other hand, the insulating member 40 can also absorb the bending deformation of the first protrusion 34, thereby avoiding the problem of the first protrusion 34 pressing the outer shell 110.

[0094] In this embodiment, the insulating member 40 is accommodated in the first limiting space 1401. Specifically, the first stopper 14 is configured as a first limiting groove 141 opened in the main body 12, and the first protrusion 34 extends into the first limiting groove 141 and is spaced apart from the groove wall of the first limiting groove 141. Along the radial direction of the current collecting assembly 300, the groove wall of the first limiting groove 141 located on the side of the first protrusion 34 away from the center of the main body 12 is configured as a stop surface 1402. The insulating member 40 is located in the first limiting groove 141. Along the radial direction of the current collecting assembly 300, the first protrusion 34 and the stop surface 1402 are spaced apart by the insulating member 40, so as to avoid the first protrusion 34 directly contacting the stop surface 1402 and causing scratches and debris, thereby causing a short circuit problem, and the insulating member 40 has a simple structure, is convenient for processing and molding, and reduces the amount, saving production costs.

[0095] In some embodiments, the first stopper 14 is configured as a first stopper protrusion 1421, a second stopper protrusion 1422, and a third stopper protrusion 1423 protruding from the side of the main body 12 facing the main body 32. The first stopper protrusion 1421 and the second stopper protrusion 1422 are arranged at intervals along the circumferential direction of the current collecting assembly 200. The third stopper protrusion 1423 is connected to the first stopper protrusion 1421 and the second stopper protrusion 1422 at both ends along the circumferential direction of the current collecting assembly 200. The third stopper protrusion 1423 is located on the side of the first protrusion 34 away from the center of the main body 12. The side surface of the third stopper protrusion 1423 facing the first protrusion 34 is configured as a stopper surface 1402. Along the radial direction of the current collecting assembly 300 , the first protrusion 34 and the third stop protrusion 1423 are spaced apart by the insulating member 40 , thereby preventing the first protrusion 34 and the third stop protrusion 1423 from directly contacting each other and causing scratches and debris, thereby causing a short circuit.

[0096] Exemplarily, in the present embodiment, the insulating member 40 is fixed to the stop surface 1402 by gluing. In some embodiments, the insulating member 40 and the stop surface 1402 may also be fixed by, but not limited to, snap-fitting. The material of the insulating member 40 includes, but is not limited to, polypropylene (PP), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), polyimide (PI), polystyrene (PS), cast polypropylene (CPP), polyethylene naphthalate diformicacid glycol ester (PEN), polyvinyl chloride (PVC), polyether-ether-ketone (PEEK), polyethersulfone resin (PES), polyphenylene sulfone resin (PES), polyphenylene sulfone In some embodiments, the insulating member 40 is a PET film. The PET film is a glossy plastic film with excellent physical properties, high rigidity, strength and ductility, puncture resistance, abrasion resistance, heat resistance and ultra-low temperature resistance, chemical resistance, wear resistance, sealing and fragrance retention. Of course, the insulating member 40 can also be replaced by other materials such as PPS, PE, PVC, etc. according to actual needs.

[0097] See also Figure 1 , Fig. 9 and Fig.19 , Fig.19 It is a cross-sectional view of the current collecting assembly 400 of the energy storage device 1000 provided in the fourth embodiment of the present application. In the fourth embodiment, the structure of the current collecting assembly 400 is similar to the structure of the current collecting assembly 300 of the third embodiment. For details, please refer to the introduction of the current collecting assembly 300 of the third embodiment, which will not be repeated here. The difference is that the insulating member 40 includes an isolating portion 41 located in the first limiting space 1401 and a bending portion 42 located outside the first limiting space 1401. In the radial direction of the current collecting assembly 400, a welding portion 121 is convexly provided on the outer periphery of the main body 12. One end of the bending portion 42 is connected to the isolating portion 41, and the other end extends toward the welding portion 121 and is located between the welding portion 121 and the first protrusion 34. Among them, the bending portion 42 and the main body 12 can be arranged in contact with each other to improve the connection strength between the insulating member 40 and the main body 12, without the need to set an additional fixing structure, and to make the structure of the current collecting assembly 400 more compact.

[0098] The welding part 121 is used for welding with the shell 110. A step is formed between the welding part 121 and the main body 12, and the shell 110 abuts on the step. Specifically, the end face of the shell 110 along the axial direction of the current collecting assembly 300 is welded to the surface of the welding part 121 along the axial direction of the current collecting assembly 300. After the shell 110 is welded to the welding part 121, the inner side wall of the shell 110 is arranged in contact with the outer peripheral wall of the main body 12.

[0099] In some embodiments, along the radial direction of the current collecting assembly 400, the bent portion 42 extends to the welding portion 121, so as to avoid the problem of the shell 110 and the main body 12 being scratched and generating debris when the shell 110 and the cover plate 10 are assembled, thereby causing a short circuit. A receiving groove 401 is provided at one end of the bent portion 42 close to the welding portion 121, and the opening direction of the receiving groove 401 is set toward the main body 12. The receiving groove 401 is used to receive welding debris generated when the shell 110 and the welding portion 121 are welded, thereby improving the safety of the energy storage device 1000. Among them, the receiving groove 401 can be formed when the shell 110 and the welding portion 121 are welded. When the shell 110 and the welding portion 121 are welded, the welding temperature is greater than the melting point of the insulating member 40, and the bent portion 42 can be melted at a position close to the welding portion 121 to form the receiving groove 401, and the processing technology of the receiving groove 401 is simple. In some other embodiments, the receiving groove 401 may also be pre-formed on the insulating member 40 by other means, which is not specifically limited in the present application.

[0100] In some embodiments, in the radial direction of the current collecting assembly 400, a first chamfered structure 122 is provided on the side of the main body 12 away from the first protrusion 34. The first chamfered structure 122 is located on the side of the cover plate 10 close to the current collecting plate 30, so that the cover plate 10 can be quickly installed in the housing 110 of the energy storage device 1000, thereby improving the assembly efficiency and processing speed, and reducing the risk of scratches between the cover plate 10 and the housing 110, thereby improving the safety of the energy storage device 1000. The bent portion 42 extends from the isolation portion 41 toward the first chamfered structure 122 and is attached to the first chamfered structure 122. A second chamfered structure 43 corresponding to the first chamfered structure 122 is provided on the side of the insulating member 40 away from the main body 12. On the one hand, based on the setting of the first chamfered structure 122 and the second chamfered structure 43, the cover plate 10 can be quickly installed in the shell 110 of the energy storage device 1000, thereby improving the assembly efficiency and the processing speed. On the other hand, the bending portion 42 extends from the isolation portion 41 toward the first chamfered structure 122 to avoid the problem of short circuit caused by the friction between the shell 110 and the cover plate 10 to generate fine chips.

[0101] It should be noted that the structure of the insulating member 40 of the third embodiment and the fourth embodiment is applicable to the current collecting assembly 100 of the first embodiment and the current collecting assembly 200 of the second embodiment, and the present application does not make any specific limitation thereto.

[0102] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A current collecting assembly (100, 200, 300, 400), It is characterized in that include: A cover plate (10) comprising a main body (12) and a first stopper (14) connected to the main body (12); An explosion-proof valve (13) is arranged on the main body (12); as well as A current collecting plate (30), comprising a main body (32) and a first protruding portion (34); the main body (32) is arranged opposite to the main body (12); the main body (32) is provided with a welding groove (321) and a vent hole (322) located outside the welding groove (321); the first protruding portion (34) is fixedly connected to the main body (32) and is used to stop the first stop portion (14), so as to limit the movement of the first protruding portion (34) along the circumferential direction of the current collecting assembly (100, 200, 300, 400) through the first stop portion (14), and to make the welding groove (321) at least partially arranged opposite to the explosion-proof valve (13) along the axial direction of the current collecting assembly (100, 200, 300, 400); An insulating member (40), wherein the first stop portion (14) has a stop surface (1402) disposed toward the first protruding portion (34), and the insulating member (40) is located between the first protruding portion (34) and the stop surface (1402).

2. The current collecting assembly (100, 200, 300, 400) according to claim 1, It is characterized in that A first limiting space (1401) is formed between the first stop portion (14) and the main body portion (12); the first protrusion (34) is extended from the main body portion (32) toward the main body portion (12); an end of the first protrusion (34) away from the main body portion (32) is located in the first limiting space (1401) and is spaced apart from the main body portion (12) and the first stop portion (14), respectively.

3. The current collecting assembly (100, 200, 300, 400) according to claim 1, It is characterized in that The orthographic projection of the welding groove (321) along the axial direction of the current collecting assembly (100, 200, 300, 400) overlaps with the orthographic projection of the explosion-proof valve (13) along the axial direction of the current collecting assembly (100, 200, 300, 400), the area of ​​the overlapping region of the orthographic projection of the welding groove (321) and the orthographic projection of the explosion-proof valve (13) is a first area (S1), the area of ​​the orthographic projection of the explosion-proof valve (13) is a second area (S2), and the ratio of the first area (S1) to the second area (S2) is 0.3-1.

4. The current collecting assembly (100, 200, 300, 400) according to claim 1, It is characterized in that The orthographic projection of the vent hole (322) on the main body (12) is located outside the orthographic projection of the explosion-proof valve (13) on the main body (12).

5. The current collecting assembly (100, 200, 300, 400) according to claim 2, It is characterized in that The first stopper (14) is configured as a first limiting groove (141) opened in the main body (12), and the first limiting space (1401) is formed in the first limiting groove (141); one end of the first protrusion (34) away from the main body (32) extends into the first limiting groove (141) and is spaced apart from the groove wall of the first limiting groove (141).

6. The current collecting assembly (100, 200, 300, 400) according to claim 2, It is characterized in that The first stop portion (14) is configured as a first stop protrusion (1421) and a second stop protrusion (1422) which are protruded on a side of the main body (12) facing the body portion (32); the first stop protrusion (1421) and the second stop protrusion (1422) are arranged at intervals along the circumferential direction of the current collecting assembly (100, 200, 300, 400); the first limit space (1401) is formed between the first stop protrusion (1421), the second stop protrusion (1422) and the main body (12); along the circumferential direction of the current collecting assembly (100, 200, 300, 400), the first protrusion (34) is located between the first stop protrusion (1421) and the second stop protrusion (1422), and is arranged at intervals with the first stop protrusion (1421) and the second stop protrusion (1422), respectively.

7. The current collecting assembly (100, 200, 300, 400) according to claim 6, It is characterized in that The first stop portion (14) further comprises a third stop protrusion (1423) protruding from a side of the main body (12) facing the body portion (32); the third stop protrusion (1423) is respectively connected to the first stop protrusion (1421) and the second stop protrusion (1422) at two ends along the circumferential direction of the current collecting assembly (100, 200, 300, 400); the third stop protrusion (1423) is located on a side of the first protrusion (34) away from the center of the main body (12) and is spaced apart from the first protrusion (34); the third stop protrusion (1423) is used to limit the movement of the first protrusion (34) along the radial direction of the current collecting assembly (100, 200, 300, 400).

8. The current collecting assembly (100, 200, 300, 400) according to claim 2, It is characterized in that The central angle (φ1) corresponding to the circumferential length of the first stop portion (14) along the circumferential direction of the current collecting assembly (100, 200, 300, 400) is 5°-20°; the radial length (W1) of the first stop portion (14) along the radial direction of the current collecting assembly (100, 200, 300, 400) is 0.3mm-3.5mm; the axial length (H1) of the first stop portion (14) along the axial direction of the current collecting assembly (100, 200, 300, 400) is 1.5mm-3.5mm; and the axial length (H2) of the first protrusion (34) extending into the first limiting space (1401) along the axial direction of the current collecting assembly (100, 200, 300, 400) is 0.5mm-2.54mm.

9. The current collecting assembly (100, 200, 300, 400) according to claim 2, It is characterized in that The circumferential length (L1) of the first stopper (14) along the circumferential direction of the current collecting assembly (100, 200, 300, 400) is 4.5 mm to 7.5 mm.

10. The current collecting assembly (100, 200, 300, 400) according to claim 2, It is characterized in that The first protrusion (34) is movable within the first limiting space (1401).

11. The current collecting assembly (100, 200, 300, 400) according to claim 1, It is characterized in that The first protruding portion (34) is fixedly connected to the first stop portion (14).

12. The current collecting assembly (100, 200, 300, 400) according to claim 11, It is characterized in that The first stopper (14) is configured as a first limiting groove (141) provided on the main body (12); a clamping hole (15) is provided on the side wall of the first limiting groove (141) along the circumferential direction of the current collecting assembly (100, 200, 300, 400); and a buckle (35) for clamping with the clamping hole (15) is provided on the side wall of the first protrusion (34) along the circumferential direction of the current collecting assembly (100, 200, 300, 400).

13. The current collecting assembly (100, 200, 300, 400) according to claim 1, It is characterized in that One end of the first protrusion (34) away from the main body (32) is spaced apart from the main body (12).

14. The current collecting assembly (100, 200, 300, 400) according to claim 1, It is characterized in that The first protrusion (34) is located at the outer peripheral edge of the main body (32), and along the circumferential direction of the current collecting assembly (100, 200, 300, 400), bending grooves (341) are provided on both sides of the first protrusion (34), and the bending grooves (341) are opened along the radial direction of the main body (32).

15. The current collecting assembly (100, 200, 300, 400) according to claim 2, It is characterized in that The insulating member (40) comprises an isolating portion (41) located in the first limiting space (1401) and a bent portion (42) located outside the first limiting space (1401); in the radial direction of the current collecting assembly (100, 200, 300, 400), a welding portion (121) is protrudingly provided on the outer periphery of the main body (12); one end of the bent portion (42) is connected to the isolating portion (41), and the other end extends toward the welding portion (121) and is located between the welding portion (121) and the first protruding portion (34).

16. The current collecting assembly (100, 200, 300, 400) according to claim 15, It is characterized in that Along the radial direction of the current collecting assembly (100, 200, 300, 400), the bent portion (42) extends to the welding portion (121), and a receiving groove (401) is provided at one end of the bent portion (42) close to the welding portion (121), and the opening direction of the receiving groove (401) is arranged toward the main body (12).

17. The current collecting assembly (100, 200, 300, 400) according to claim 1, It is characterized in that The cover plate (10) further comprises a second stopper (16), a second limiting space (1601) being formed between the second stopper (16) and the main body (12); the current collecting plate (30) further comprises a second protruding portion (36) fixedly connected to the main body (32), the second protruding portion (36) being spaced apart from the first protruding portion (34); an end of the second protruding portion (36) away from the main body (32) is located in the second limiting space (1601), and the second stopper (16) limits the movement of the second protruding portion (36) in the radial direction of the current collecting assembly (100, 200, 300, 400).

18. The current collecting assembly (100, 200, 300, 400) according to claim 17, It is characterized in that The second stop portion (16) is configured as a second limiting groove (161) opened from a side of the main body (12) toward the main body (32) in a direction away from the main body (32), and the second limiting space (1601) is formed in the second limiting groove (161); one end of the second protrusion (36) away from the main body (32) extends into the second limiting groove (161); or, The second stop portion (16) is configured as a fourth stop protrusion (1621) and a fifth stop protrusion (1622) which are protruded on a side of the main body (12) facing the body portion (32); the fourth stop protrusion (1621) and the fifth stop protrusion (1622) are arranged at intervals along the circumferential direction of the current collecting assembly (100, 200, 300, 400); the second limiting space (1601) is formed between the fourth stop protrusion (1621), the fifth stop protrusion (1622) and the main body (12); along the circumferential direction of the current collecting assembly (100, 200, 300, 400), the second protrusion (36) is located between the fourth stop protrusion (1621) and the fifth stop protrusion (1622).

19. The current collecting assembly (100, 200, 300, 400) according to claim 17, It is characterized in that The second protrusions (36) are arranged in plurality; along the circumferential direction of the current collecting assembly (100, 200, 300, 400), the first protrusion (34) is located between two adjacent second protrusions (36).

20. An energy storage device (1000), It is characterized in that The invention comprises a housing (110), an electrode assembly (120), and a current collecting assembly (100, 200, 300, 400) according to any one of claims 1 to 19; the current collecting assembly (100, 200, 300, 400) is sealed and fixedly connected to the housing (110) to form a receiving cavity (130); the electrode assembly (120) is received in the receiving cavity (130).

21. An electrical device, It is characterized in that It comprises the energy storage device (1000) as claimed in claim 20, wherein the energy storage device (1000) provides electrical energy for the electrical equipment.

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