CN116154183A - Current collecting assembly, energy storage device and electric equipment - Google Patents

Abstract

The application provides a current collecting assembly, an energy storage device and electric equipment. The current collecting assembly comprises a cover plate, an explosion-proof valve and a current collecting disc. The cover plate includes a main body portion and a first stopper portion. The explosion-proof valve is arranged on the main body part. The collecting disc comprises a body part and a first bulge part, the body part is arranged opposite to the body part, and the body part is provided with a welding groove and a vent hole positioned outside the welding groove; the first protruding portion is fixedly connected to the body portion and is used for being stopped by the first stopping portion, so that the first protruding portion is limited to move along the circumferential direction of the current collecting assembly through the first stopping portion, and the welding groove and the explosion-proof valve portion are arranged oppositely along the axial direction of the current collecting assembly, so that when the energy storage device is impacted by external force, electrolyte can be stopped by the welding groove, the electrolyte can not directly impact the explosion-proof valve, and the explosion-proof valve is prevented from being triggered by errors.

Description

Current collecting assembly, energy storage device and electric equipment

Technical Field

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

Background

With the increasing prominence of environmental problems, low carbon economy has become the mainstay of future economic development. The increasingly severe air situation has further prompted the rise and development of energy storage devices. The energy storage device with high energy density, high power density, multiple recycling times and long storage time becomes a key for solving the global problems of energy crisis, environmental pollution and the like.

In general, in order to ensure the safety of the energy storage device, an explosion-proof valve is disposed on a cover plate of the energy storage device, when the energy storage device is in an unexpected situation (such as overcharge, thermal runaway, shell breakage, etc.), a large amount of gas is generated in the energy storage device, the internal pressure of the energy storage device is increased, and when the internal pressure of the energy storage device is greater than a predetermined value, the internal gas can rush open the explosion-proof valve, so that the internal pressure of the energy storage device is reduced, and the safety of the energy storage device is ensured. However, when the existing energy storage device is impacted by external force (if the existing energy storage device falls off unexpectedly), electrolyte in the energy storage device can directly impact the explosion-proof valve upwards, so that the explosion-proof valve is triggered by mistake, and the reliability of the energy storage device is poor and the service life of the energy storage device is low.

Disclosure of Invention

The embodiment of the application provides a current collecting assembly, an energy storage device and electric equipment, so as to solve the problem that an explosion-proof valve is easy to be triggered by errors.

In a first aspect, the present application provides a manifold assembly comprising a cover plate, an explosion-proof valve, and a manifold disc. The cover plate comprises a main body part and a first stop part connected with the main body part. The explosion-proof valve is arranged on the main body part. The current collecting disc comprises a body part and a first protruding part, the body part is arranged opposite to the body part, and the body part is provided with a welding groove and a vent hole positioned outside the welding groove; the first protruding portion is fixedly connected to the body portion and is used for being stopped by the first stopping portion, so that the first protruding portion is limited to move along the circumferential direction of the current collecting assembly through the first stopping portion, and the welding groove is at least partially arranged opposite to the explosion-proof valve along the axial direction of the current collecting assembly.

With reference to the first aspect, in certain implementation manners of the first aspect, a first limiting space is formed between the first stop portion and the main body portion, the first protruding portion extends from the main body portion towards the main body portion, one end, away from the main body portion, of the first protruding portion is located in the first limiting space and is respectively spaced from the main body portion and the first stop portion, so that a portion, corresponding to the welding groove, of the main body portion is arranged opposite to a portion, corresponding to the explosion-proof valve, of the main body portion.

With reference to the first aspect, in certain implementation manners of the first aspect, an orthographic projection of the welding groove along an axial direction of the current collecting assembly overlaps with an orthographic projection of the explosion-proof valve along the axial direction of the current collecting assembly, an area of an overlapping region of the orthographic projection of the welding groove and the orthographic projection of the explosion-proof valve is a first area, an area of the orthographic projection of the explosion-proof valve is a second area, and a ratio of the first area to the second area is 0.8-1, so that direct impact of electrolyte on the explosion-proof valve is avoided, and the explosion-proof valve is prevented from being triggered by errors.

With reference to the first aspect, in certain implementation manners of the first aspect, an orthographic projection of the vent hole on the main body portion is located outside an orthographic projection of the explosion-proof valve on the main body portion, so that the electrolyte cannot directly impact the explosion-proof valve, and further, the explosion-proof valve is prevented from being triggered by errors.

With reference to the first aspect, in certain implementation manners of the first aspect, the first stop portion is configured as a first limit groove that is opened in the main body portion, and the first limit space is formed in the first limit groove; the one end that first bellying kept away from body portion stretches into to in the first spacing groove, and with the cell wall interval setting of first spacing groove to reduce the axial length of mass flow subassembly, make energy memory's structure compacter.

With reference to the first aspect, in certain implementation manners of the first aspect, the first stop portion is configured to be a first stop protrusion and a second stop protrusion that are protruding from a side of the main body portion facing the main body portion, the first stop protrusion and the second stop protrusion are disposed at intervals along a circumferential direction of the current collecting assembly, and the first limit space is formed between the first stop protrusion, the second stop protrusion and the main body portion; along the circumference direction of mass flow subassembly, first bellying is located first backstop protruding with between the second backstop is protruding, and with first backstop protruding with the second backstop protruding interval sets up respectively to reduce the processing degree of difficulty of first backstop portion, and avoid reducing the structural strength of main part.

In combination with the first aspect, in certain implementation manners of the first aspect, the first stop portion further includes a third stop protrusion protruding from one side of the main body portion towards the main body portion, two ends of the third stop protrusion along a circumferential direction of the current collecting assembly are respectively connected with the first stop protrusion and the second stop protrusion, the third stop protrusion is located on one side of the first protrusion away from a center of the main body portion and is spaced from the first protrusion, and the third stop protrusion is used for limiting movement of the first protrusion along a radial direction of the current collecting assembly, so that when the energy storage device is overcharged, thermally uncontrolled or mechanically vibrated, the third stop protrusion can limit the first protrusion to be folded in a direction away from the center of the main body portion and be pressed against the housing, thereby avoiding a problem that welding is unreliable at a welding seal between the cover plate and the housing, further ensuring a welding yield of the welding seal, and prolonging a service life of the energy storage device.

With reference to the first aspect, in certain implementation manners of the first aspect, a central angle corresponding to a circumferential length of the first stop portion along a circumferential direction of the current collecting assembly is 5 ° -20 °; the radial length of the first stop part along the radial direction of the current collecting assembly is 0.3mm-3.5mm; the axial length of the first stop part 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 protruding part extending into the first limiting space is 0.5mm-2.54mm, so that the first protruding part extends into the first limiting space conveniently, the current collecting disc and the cover plate are convenient to install, and the welding groove is at least partially arranged opposite to the explosion-proof valve.

With reference to the first aspect, in certain implementation manners of the first aspect, a circumferential length of the first stop portion along a circumferential direction of the current collecting assembly is 4.5mm to 7.5mm, so that the first protruding portion is convenient to extend into the first limiting space, and installation of the current collecting disc and the cover plate is convenient.

With reference to the first aspect, in certain implementation manners of the first aspect, the first protruding portion is movable in the first limiting space, so that the first protruding portion is convenient to extend into the first limiting space, and further installation of the current collecting disc and the cover plate is convenient.

With reference to the first aspect, in certain implementation manners of the first aspect, the first protruding portion is fixedly connected with the first stopping portion, so that the first protruding portion is fixedly connected with the first stopping portion, and therefore when the cover plate and the shell are welded, the current collecting disc can play a role in fixing and coarsely positioning the cover plate, and therefore the cover plate and the shell can be welded better; on one hand, the first bulge part and the groove wall of the first limit groove can be prevented from being scratched to generate metal scraps; on the other hand, the welding groove and the explosion-proof valve can be better aligned.

With reference to the first aspect, in certain implementation manners of the first aspect, the first stop portion is configured as a first limit groove that is opened in the main body portion, a clamping hole is opened in a side wall of the first limit groove along a circumferential direction of the current collecting assembly, and a buckle that is used for being clamped with the clamping hole is provided in a side wall of the first protruding portion along the circumferential direction of the current collecting assembly, so that the first protruding portion is fixedly connected with the first stop portion.

With reference to the first aspect, in certain implementation manners of the first aspect, an end of the first protruding portion, which is far away from the body portion, is disposed at a distance from the main body portion, so as to avoid that when the current collecting disc and the cover plate are installed, a scratch occurs between the first protruding portion and the main body portion to generate metal chips.

With reference to the first aspect, in some implementations of the first aspect, the first protruding portion is located at an outer peripheral edge of the body portion, along a circumferential direction of the current collecting assembly, bending grooves are formed in two sides of the first protruding portion, and the bending grooves are formed in a radial direction of the body portion, so that cracks are formed at a connection position between the first protruding portion and the body portion when the first protruding portion is bent, and connection strength between the first protruding portion and the body portion is improved.

With reference to the first aspect, in certain implementation manners of the first aspect, the current collecting assembly further includes an insulating member, the first stop portion has a stop surface disposed towards the first protrusion, and the insulating member is located between the first protrusion and the stop surface, so that on one hand, the problem that the first protrusion directly contacts with the first stop portion to scratch and generate chips and further cause a short circuit is avoided; on the other hand, the insulator can also absorb the bending deformation of the first protruding part, so that the problem that the first protruding part bends the shell is avoided.

In combination with the first aspect, in certain implementation manners of the first aspect, the insulating member includes an isolation portion located in the first limiting space and a bending portion located outside the first limiting space, in a radial direction of the current collecting assembly, a welding portion is convexly arranged on an outer periphery of the main body portion, one end of the bending portion is connected with the isolation portion, the other end of the bending portion faces the welding portion to extend and be located between the welding portion and the first protruding portion, so that when the casing and the cover plate are assembled, the casing and the main body portion are prevented from being scratched and chippings are generated, and a short circuit is caused.

With reference to the first aspect, in some implementations of the first aspect, along a radial direction of the current collecting assembly, the bending portion extends to the welding portion, an accommodating groove is formed at an end, close to the welding portion, of the bending portion, an opening direction of the accommodating groove is set towards the main body portion, and the accommodating groove is used for accommodating welding scraps generated when the shell is welded to the welding portion, so that safety of the energy storage device is improved.

With reference to the first aspect, in certain implementation manners of the first aspect, the cover plate further includes a second stop portion, and a second limiting space is formed between the second stop portion and the main body portion; the current collecting disc further comprises a second protruding part fixedly connected to the body part, and the second protruding part is arranged at intervals with the first protruding part; the second protruding portion is far away from one end of body portion is located in the spacing space of second, the second backstop portion is spacing the second protruding portion is followed collector assembly's radial direction's removal to when energy storage device overcharge, thermal runaway or mechanical vibration, the second backstop portion can restrict second protruding portion to turn over to the direction of keeping away from the center of body portion.

With reference to the first aspect, in certain implementation manners of the first aspect, the second stop portion is configured as a second limit groove that is opened from a side of the main body portion toward the main body portion to a direction away from the main body portion, and the second limit groove is formed with the second limit space therein; one end of the second protruding part far away from the body part extends into the second limit groove; or, the second stopping part is configured to be a fourth stopping protrusion and a fifth stopping protrusion protruding from one side of the main body part facing the main body part, the fourth stopping protrusion and the fifth stopping protrusion are arranged at intervals along the circumferential direction of the current collecting assembly, and the second limiting space is formed among the fourth stopping protrusion, the fifth stopping protrusion and the main body part; along the circumference direction of the current collecting component, the second protruding part is positioned between the fourth stop protruding part and the fifth stop protruding part, so that the axial length of the current collecting component is reduced, the structure of the energy storage device is more compact, the processing difficulty of the first stop part is reduced, and the structural strength of the main body part is avoided.

With reference to the first aspect, in certain implementations of the first aspect, the second protrusion is provided in a plurality; along the circumferential direction of the current collecting assembly, the first protruding parts are positioned between two adjacent second protruding parts, so that the structural strength of the body part is enhanced, and the body part is prevented from being accidentally bent during transportation or installation.

In a second aspect, the present application provides an energy storage device, where the energy storage device includes a housing and a current collecting assembly according to any one of the foregoing, the cover plate is fixedly connected to the housing, and the current collecting disc is accommodated in the housing.

In a third aspect, the present application provides an electric device, where the electric device includes the energy storage device according to any one of the embodiments, and the energy storage device provides electric energy for the electric device.

In the mass flow component, the energy storage device and the electric equipment provided by the application, the first stop part is used for limiting the movement of the first protruding part along the circumferential direction of the mass flow component, and the welding groove is at least partially arranged opposite to the explosion-proof valve along the axial direction of the mass flow component. Therefore, in the current collecting assembly, the energy storage device and the electric equipment, on one hand, when the energy storage device is impacted by external force (falls off unexpectedly), electrolyte in the energy storage device can be stopped by the welding groove on the body part, and the electrolyte can not directly impact the explosion-proof valve on the body part, so that the explosion-proof valve is prevented from being triggered by mistake, and the reliability and the service life of the energy storage device are improved; on the other hand, when the energy storage device has unexpected conditions (such as overcharge, thermal runaway, shell breakage and the like), gas generated inside the energy storage device can reach the position of the explosion-proof valve through the vent hole on the body part, so that the explosion-proof valve can be triggered, and the safety of the energy storage device is further ensured.

Drawings

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

Fig. 1 is a household energy storage scene diagram of an energy storage device according to an embodiment of the present application.

Fig. 2 is an exploded view of an energy storage device provided in an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a current collecting assembly according to a first embodiment of the present application.

Fig. 4 is an exploded view of the header assembly of fig. 3.

Fig. 5 is a schematic view of the structure of the cover plate in fig. 3.

Fig. 6 is a schematic view of the structure of the collecting tray of fig. 3.

Fig. 7 is a schematic illustration of an orthographic projection of an explosion protection valve and weld groove provided in an embodiment of the present application along an axial direction of a header assembly.

Fig. 8 is a cross-sectional view of the manifold assembly of fig. 3 taken along line A-A.

Fig. 9 is an enlarged view of the portion I in fig. 8.

Fig. 10 is a cross-sectional view of a clasp and clasp aperture provided in some embodiments of the present application.

Fig. 11 is a cross-sectional view of the current collecting assembly of fig. 3 taken along line B-B.

Fig. 12 is an enlarged view of the portion II in fig. 11.

Fig. 13 is a schematic structural view of a current collecting assembly according to a second embodiment of the present application.

Fig. 14 is a schematic view of the structure of the cover plate in fig. 13.

Fig. 15 is a schematic view of the structure of the collecting tray of fig. 13.

Fig. 16 is a cross-sectional view of the manifold assembly of fig. 13 taken along line C-C.

Fig. 17 is an enlarged view at III in fig. 16.

Fig. 18 is a cross-sectional view of a current collecting assembly of an energy storage device according to a third embodiment of the present application.

Fig. 19 is a cross-sectional view of a current collecting assembly of an energy storage device according to a fourth embodiment of the present application.

Description of main reference numerals: an energy storage device 1000; an electric energy conversion device 2000; a street lamp 410; a home appliance 420; a current collecting assembly 100; a current collecting assembly 200; a current collecting assembly 300; a current collecting assembly 400; a housing 110; an opening 111; an electrode assembly 120; a housing chamber 130; a cover plate 10; a main body 12; a welded portion 121; a first chamfer structure 122; an explosion-proof valve 13; a first stopper 14; a first spacing space 1401; a stop surface 1402; a first limit groove 141; a first stopper wall 1411; a second stop wall 1412; a third stop wall 1413; a first bottom wall 1414; a first stop tab 1421; a second stop tab 1422; a third stop tab 1423; a clamping hole 15; a second stopper 16; a second limit space 1601; a second limit groove 161; a fourth stop wall 1611; a second bottom wall 1612; a fourth stop boss 1621; a fifth stop boss 1622; a sixth stop boss 1623; a collecting tray 30; a body portion 32; a welding groove 321; a vent 322; a first boss 34; a bending groove 341; a buckle 35; a second boss 36; an insulating member 40; a spacer 41; a bending portion 42; a second chamfer structure 43; a housing groove 401; a first area S1; a second area S2; central angle phi 1; central angle phi 2; central angle phi 3; a radial length W1; a radial length W2; a radial length W3; a radial length W4; a radial length R1; an axial length H1; an axial length H2; an axial length H4; an axial length H5; axial length H7; axial length H8; overlap length H3; overlap length H10; an axial distance H6; an axial distance H9; a circumferential length L1; a circumferential length L2; a first slit D1; a second slit D2; and a third slit D3.

The following detailed description will further illustrate the application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments in the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

It is noted that the terms in the specification and claims of the present application and the above-mentioned drawings are only for describing particular embodiments, and are not intended to limit the present application. The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. The term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. As is well known, in order to achieve the large goal of carbon neutralization, the current main way of generating green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources, the current generation of green electric energy generally depends on the problems of strong intermittence and large volatility of wind energy, solar energy and the like, the power grid is unstable, the electricity consumption is insufficient, the electricity consumption is too low, the unstable voltage also causes damage to the electric power, and therefore, the problem of 'wind abandoning and light abandoning' is possibly caused due to insufficient electricity consumption requirement or insufficient power grid receiving capability, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, the present solution provides an energy storage device 1000, in which a chemical battery is disposed in the energy storage device 1000, and chemical elements in the chemical battery are mainly used as an energy storage medium, and a charging and discharging process is accompanied with chemical reaction or change of the energy storage medium.

The present energy storage (i.e. energy storage) application scenario is wider, including aspects such as power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage, user side energy storage, etc., the types of the corresponding energy storage device 1000 include:

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

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

In this embodiment, a household energy storage scene in user side energy storage is taken as an example for illustration, fig. 1 is a household energy storage scene diagram of an energy storage device 1000 provided in this embodiment, and the energy storage device 1000 is not limited to the household energy storage scene.

The present application provides a household energy storage system comprising an electrical energy conversion device 2000, a user load and an energy storage device 1000. The power conversion device 2000 may be a photovoltaic panel. The consumer load is a consumer and the energy storage device 1000 provides electrical energy to the consumer. The user load may be a street lamp 410, a home appliance 420, or the like. The energy storage device 1000 is a small energy storage box and can be installed on an outdoor wall in a wall hanging manner. In particular, the photovoltaic panel may convert solar energy into electric energy during low electricity price periods, and the energy storage device 1000 is used to store the electric energy and supply the street lamp 410 and the household appliance 420 for use during electricity price peaks, or supply power during grid outage/outage.

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

Referring to fig. 2, fig. 2 is an exploded view of an energy storage device 1000 according to an embodiment of the present disclosure. The energy storage device 1000 includes a case 110, an electrode assembly 120, and a current collecting assembly 100. The housing 110 has an opening 111, the current collecting assembly 100 is disposed at the opening 111, and covers the opening 111. The current collecting assembly 100 is fixedly connected with the shell 110 in a sealing way, and forms a containing cavity 130 with the shell 110 in a surrounding way. The electrode assembly 120 is accommodated in the accommodating chamber 130. The current collecting assembly 100 includes a cap plate 10, an explosion-proof valve 13, and a current collecting tray 30. The cover plate 10 covers the opening 111. An explosion-proof valve 13 is provided on the cover plate 10. The current collecting plate 30 is received in the receiving chamber 130, and the current collecting plate 30 is positioned between the electrode assembly 120 and the cap plate 10. It is understood that the electrolyte is further contained in the containing chamber 130, and the electrolyte wets the electrode assembly 120.

It should be noted that fig. 2 is only for schematically describing the arrangement of the current collecting assembly 100, the case 110, and the electrode assembly 120, and is not intended to limit the connection positions, connection relationships, specific structures, and the like of the respective elements. Fig. 2 is merely a schematic structure of the energy storage device 1000 according to the embodiment of the present application, and does not constitute a specific limitation of the energy storage device 1000. In other embodiments of the present application, energy storage device 1000 may include more or fewer components than shown in fig. 2, or certain components may be combined, or different components, e.g., energy storage device 1000 may also include, but is not limited to, seals, tabs, etc.

It should be noted that, as used in the embodiments and the claims herein, the term "axial direction X" 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, i.e., along a radius of a cross-section of the energy storage device 1000. The term "circumferential direction Z" refers to a circumferential direction of the energy storage device 1000, i.e. a direction around 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 manifold assembly 100 is parallel to the axial direction X, the radial direction of the manifold assembly 100 is parallel to the radial direction Y, and the circumferential direction of the manifold assembly 100 is parallel to the circumferential direction Z.

Referring to fig. 2, fig. 3, fig. 4, fig. 5, and fig. 6, fig. 3 is a schematic structural diagram of a current collecting assembly 100 according to a first embodiment of the present disclosure; fig. 4 is an exploded view of the header assembly 100 of fig. 3; fig. 5 is a schematic view of the structure of the cover plate 10 in fig. 3;

fig. 6 is a schematic view of the structure of the collecting tray 30 of fig. 3. 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 provided in the main body 12. A first limiting space 1401 is formed between the main body 12 and the first stopper 14. The current collecting plate 30 includes a body portion 32 and a first boss 34. The body portion 32 is disposed opposite the body portion 12. The 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 body portion 32, and the first protruding portion 34 extends from the body portion 32 toward the main body portion 12 (i.e., away from the body portion 32). One end of the first protruding portion 34 away from the body portion 32 (i.e., the end of the first protruding portion 34) is located in the first limiting space 1401, and the first protruding portion 34 is spaced apart from the main body portion 12 and the first stop portion 14, respectively. The first protruding portion 34 is used for stopping with the first stopping portion 14, so that the first protruding portion 34 is limited by the first stopping portion 14 to move along the circumferential direction of the current collecting assembly 100, and the welding groove 321 is at least partially opposite to the main body portion 12 along the axial direction of the current collecting assembly 100, so that when the energy storage device 1000 is impacted by external force (if the energy storage device falls off unexpectedly), electrolyte in the energy storage device 1000 can be stopped by the welding groove 321 in the main body portion 32, the electrolyte can not directly impact the explosion-proof valve 13 in the main body portion 12, and accordingly the explosion-proof valve 13 is prevented from being triggered by mistake, reliability and service life of the energy storage device 1000 are improved, and on the other hand, when the energy storage device 1000 is in unexpected conditions (such as overcharging, thermal runaway, shell breakage and the like), gas generated in the energy storage device 1000 can reach the position of the explosion-proof valve 13 through the vent 322 in the main body portion 32, so that the explosion-proof valve 13 can be triggered, and safety of the energy storage device 1000 is ensured. It should be noted that, when the energy storage device 1000 is used normally, the first protruding portion 34 is disposed at intervals with the main body portion 12 and the first stopping portion 14, and when the energy storage device 1000 is impacted by an external force, the first stopping portion 14 can stop with the first protruding portion 34 to limit the movement of the first protruding portion 34 along the circumferential direction of the current collecting assembly 100.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating an orthographic projection of the explosion-proof valve 13 and the welding groove 321 along the axial direction of the current collecting assembly 100 according to the embodiment of the present application. The front projection of the welding groove 321 in the axial direction of the collecting assembly 100 overlaps with the front projection of the explosion-proof valve 13 in the axial direction of the collecting assembly 100. The area of the overlapping region of the front projection of the welding groove 321 and the front projection of the explosion-proof valve 13 is a first area S1, the front projection area 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. It will be appreciated that when the energy storage device 1000 is impacted by an external force (such as falling off), the electrolyte in the energy storage device 1000 will impact the explosion-proof valve 13 under the inertia effect, and 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 flushed away by the electrolyte, thereby causing the explosion-proof valve 13 to be triggered by mistake. In the application, based on the fact that the welding groove 321 is at least partially arranged opposite 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 one hand, the shielding degree of the welding groove 321 to the explosion-proof valve 13 in the axial direction of the current collecting assembly 100 can be in an optimal state, when the energy storage device 1000 is impacted by external force (such as unexpected falling), the welding groove 321 can stop and buffer electrolyte, so that the impact force of the electrolyte to the explosion-proof valve 13 is reduced, and further, the explosion-proof valve 13 is prevented from being flushed away by the electrolyte to be triggered by errors; on the other hand, when the energy storage device 1000 is in an unexpected situation (such as overcharge, thermal runaway, shell breakage, 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 flush the explosion-proof valve 13, so that the explosion-proof valve 13 is normally triggered, and the safety of the energy storage device 1000 is ensured.

It is understood that the specific ratio of the first area S1 to the second area S2 may be specifically set according to actual needs, which is not specifically limited in this application. For example, the ratio of the first area S1 to the second area S2 may be related to the opening pressure of the explosion-proof valve 13, the density of the electrolyte, and the like. For example, when the opening pressure of the explosion-proof valve 13 is large and the density of the electrolyte is small, the ratio of the first area S1 to the second area S2 may be decreased by a person skilled in the art, and when the opening pressure of the explosion-proof valve 13 is small and the density of the electrolyte is large, the ratio of the first area S1 to the second area S2 may be increased by a person skilled in the art. 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, etc.

In this embodiment, 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 along the axial direction of the current collecting assembly 100, so that the space between the explosion-proof valve 13 and the electrode assembly 120 is completely shielded, and thus the electrolyte cannot directly impact the explosion-proof valve 13, so as to further avoid the false triggering of the explosion-proof valve 13. In some embodiments, the welding groove 321 may be provided with a through hole, where the through hole is formed along the axial direction of the current collecting assembly 100 and penetrates the body portion 32, and the through hole may provide a flow path for the electrolyte and the gas, so as to improve the filling efficiency of the electrolyte, thereby improving the production efficiency of the energy storage device 1000, and enabling the gas to reach the explosion-proof valve 13 more quickly when the energy storage device 1000 is unexpected. Wherein, along the axial direction of the collecting assembly 100, the orthographic projection of the through hole on the main body 12 may be located outside the orthographic projection of the explosion-proof valve 13 on the main body 12.

Referring to fig. 3, 4, 5 and 6, the first stop portion 14 is configured as a first limiting groove 141 formed in the main body 12. A first stopper space 1401 is formed in the first stopper groove 141. The first protruding portion 34 extends from the body portion 32 toward the main body portion 12, and an end of the first protruding portion 34 away from the body portion 32 extends into the first limiting groove 141. The first protruding portion 34 is spaced from the groove wall of the first limiting groove 141, that is, the first protruding portion 34 is spaced from the main body 12. The first limiting groove 141 is used for limiting the movement of the first boss 34 along the circumferential direction of the current collecting assembly 100, so that the welding groove 321 is at least partially disposed opposite to the explosion proof valve 13 along the axial direction of the current collecting assembly 100. The first limiting groove 141 is formed in a recessed manner from a side surface of the body portion 12 facing the body portion 32, so that the axial length of the current collecting assembly 100 is reduced, and the structure of the energy storage device 1000 is more compact. The first limiting groove 141 includes a first stop wall 1411 and a second stop wall 1412 that are disposed opposite each other in the circumferential direction of the current collecting assembly 100. The first stop wall 1411, the second stop wall 1412 and the main body 12 together enclose a first limiting space 1401. In the circumferential direction of header assembly 100, first tab 34 is located between first stop wall 1411 and second stop wall 1412. The first protrusion 34 is spaced from the first blocking wall 1411 and the second blocking wall 1412, so as to avoid the problem of short circuit caused by metal chips generated by rubbing between the first protrusion 34 and the first blocking wall 1411 or the second blocking wall 1412 when the current collecting tray 30 and the cover plate 10 are mounted. The first stop wall 1411 and the second stop wall 1412 are used for limiting 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 opposite 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.

In the present embodiment, the first stopping portions 14 and the first protruding portions 34 are respectively provided in plural, and the number of the first stopping portions 14 corresponds to the number of the first protruding portions 34. The plurality of first stopping portions 14 are arranged at intervals along the circumferential direction of the main body portion 12, and the plurality of first protruding portions 34 are arranged at intervals along the circumferential direction of the main body portion 32, so that the first protruding portions 34 can uniformly support the periphery of the main body portion 32, and the current collecting disc 30 and the cover plate 10 can be conveniently installed.

In the present embodiment, the first boss 34 is located at the outer peripheral edge of the body portion 32. The first protruding portion 34 and the body portion 32 may be integrally formed, and the first protruding portion 34 may be configured as a folded structure that is folded from the peripheral edge of the body portion 32 toward the main body portion 12, so as to facilitate the processing of the first protruding portion 34. Wherein, along the circumferential direction of the current collecting assembly 100, two sides of the first protruding portion 34 may be provided with bending grooves 341, where the bending grooves 341 are formed along the radial direction of the body portion 32, so as to avoid cracking at the connection position of the first protruding portion 34 and the body portion 32 when the first protruding portion 34 is bent, thereby improving the connection strength of the first protruding portion 34 and the body portion 32. In some cases, the bending groove 341 may also avoid cracking at the connection between the first protruding portion 34 and the body portion 32 when the energy storage device 1000 is overcharged, thermally run away, or subjected to mechanical vibration, so as to improve the supporting capability of the first protruding portion 34 for the body portion 32. The side wall of the bending groove 341 along the circumferential direction of the current collecting assembly 100 and the bottom wall of the bending groove along the axial direction of the current collecting assembly 100 may have an arc transition, so as to further avoid the occurrence of cracks at the connection position of the first protruding portion 34 and the body portion 32. The bending groove 341 is disposed along the axial direction of the current collecting assembly 100 and penetrates through the body portion 32, so as to provide a flow channel for the electrolyte or gas in the energy storage device 1000, so that the electrolyte can flow into the accommodating cavity 130 more rapidly when the electrolyte is filled, the production efficiency of the energy storage device 1000 is improved, and the gas can reach the position of the explosion-proof valve 13 more rapidly when the energy storage device 1000 is in an accident, and the safety of the energy storage device 1000 is improved. In some embodiments, the first protruding portion 34 and the body portion 32 may be manufactured separately, and the first protruding portion 34 is fixedly connected to a side of the body portion 32 facing the main body portion 12, or fixedly connected to an outer peripheral edge of the body portion 32, through welding, bonding, clamping, screwing, or the like.

The first stopper 14 has a circumferential length in the circumferential direction of the header assembly 100 corresponding to a central angle phi 1 of 5 deg. -20 deg.. The central angle Φ1 of the first stop 14 may be an angle formed between the first stop wall 1411 and the second stop wall 1412. The circumferential length of the first boss 34 in the circumferential direction of the header assembly 100 corresponds to a central angle phi 2 of 10 deg. -15 deg.. The central angle phi 2 of the first protrusion 34 is less than or equal to the central angle phi 1 of the first stop 14. The first protruding portion 34 is movable in the first limiting space 1401, so that the first protruding portion 34 can conveniently extend into the first limiting space 1401, the current collecting disc 30 and the cover plate 10 can be conveniently installed, and the problem that chips are generated due to interference or scratch between the first protruding portion 34 and the first stop portion 14 or the main body portion 12, and short circuit is caused is avoided. For example, in some embodiments, the central angle Φ1 of the first stop 14 may be 5 °, 10 °, 15 °, 20 °, and so on; the central angle phi 2 of the first boss 34 may be 10 deg., 11 deg., 12 deg., 13 deg., 14 deg., 15 deg., etc.

In this embodiment, the radial length R1 of the body portion 12 in the radial direction of the header assembly 100 may be 20.5mm-29.5mm. The circumferential length L1 of the first stopper 14 in the circumferential direction of the current collecting assembly 100 is 4.5mm to 7.5mm. The circumferential length L1 of the first stopper 14 may be a distance between the first stopper wall 1411 and the second stopper wall 1412 in the circumferential direction of the current collecting assembly 100. The circumferential length L2 of the first bosses 34 in the circumferential direction of the header assembly 100 is 4.5mm-6mm. The circumferential length L1 of the first stop portion 14 is greater than or equal to the circumferential length L2 of the first protruding portion 34, so that the first protruding portion 34 can conveniently extend into the first limiting space 1401, and further, the current collecting tray 30 and the cover plate 10 can be conveniently installed. For example, in some embodiments, the radial length R1 of the body portion 12 may be 20.5mm, 21mm, 25mm, 29.5mm, etc.; the circumferential length L1 of the first stop 14 may be 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, etc.; the circumferential length L2 of the first boss 34 may be 4.5mm, 5mm, 5.5mm, 6mm, etc.

Referring to fig. 8 and 9, fig. 8 is a cross-sectional view of the manifold assembly 100 of fig. 3 taken along line A-A; fig. 9 is an enlarged view of the portion I in fig. 8. The first limiting groove 141 further includes a third stopper wall 1413. The third blocking wall 1413 is connected to the first blocking wall 1411 and the second blocking wall 1412 along both sides of the current collecting assembly 100 in the circumferential direction, respectively. The third stopper wall 1413 is located outside the center of the first boss 34 away from the main body 12. The center of the main body 12 is located at a position where the main body 12 approaches the central axis P of the energy storage device 1000 along the radial direction of the current collecting assembly 100. The third stopping wall 1413 is used for stopping the first protruding portion 34 and limiting the movement of the first protruding portion 34 along the radial direction of the current collecting assembly 100, so that when the energy storage device 1000 is overcharged, thermally uncontrolled or mechanically vibrated, the third stopping wall 1413 can limit the first protruding portion 34 to fold in a direction away from the center of the main body 12, thereby avoiding the problem that the welding is unreliable at the welding sealing position between the outer shell 110 and the main body 12 due to the fact that the first protruding portion 34 abuts against the outer shell 110, further ensuring the welding yield of the welding sealing position, and prolonging the service life of the energy storage device.

In the present embodiment, the first protrusion 34 is spaced apart from the third stopper wall 1413 to form a first gap D1. The radial length W1 of the first stopper 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 slit D1 along the radial direction of the current collecting assembly 100 is 0.1mm-3.3mm, so that a certain buffer space is provided between the first protrusion 34 and the third stopper wall 1413 when the energy storage device 1000 is overcharged, thermally uncontrolled or mechanically vibrated, 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 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 14 may be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and so forth; the radial length W2 of the first lobe 34 may be 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc.; the radial length of the first slit D1 may be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.3mm, etc.

The first limiting groove 141 further includes a first bottom wall 1414 disposed opposite the body portion 32. The end of the first protruding portion 34 away from the body portion 32 is spaced from the first bottom wall 1414 to avoid metal chips generated by scraping between the first protruding portion 34 and the main body portion 12 when the current collecting plate 30 and the cover plate 10 are mounted. It will be appreciated that in some cases, when the cover plate 10 and the current collecting plate 30 are manufactured, there may be a difference in axial length between the different first limiting grooves 141, and a difference in axial length between the different first protruding portions 34, so that after the first protruding portions 34 are spaced from the first bottom wall 1414, the first protruding portions 34 and the first limiting grooves 141 may be better assembled, so that the problem of unevenness occurring after the current collecting plate 30 is mounted on the cover plate 10 is avoided.

The axial length H1 of the first stopper 14 in the axial direction of the header assembly 100 is 1.5mm-3.5mm. The axial length H1 of the first stopper 14 may be a distance between the first bottom wall 1414 and a surface of the main body 12 facing the main body 32. Along the axial direction of the current collecting assembly 100, the axial length H2 of the first protruding portion 34 extending into the first limiting space 1401 is 0.2mm-2.54mm, so that the connection stability of the first protruding portion 34 and the first limiting groove 141 is improved, and the first protruding portion 34 is prevented from falling out of the first limiting groove 141. For example, in some embodiments, the axial length H1 of the first stop 14 may be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc.; the axial length H2 of the first protrusion 34 protruding into the first space 1401 may be 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 2.54mm.

The overlapping length H3 of the first protrusion 34 and the first or second blocking wall 1411 or 1412 in the axial direction of the current collecting assembly 100 is 0.2mm to 1mm, so that the first protrusion 34 is conveniently blocked by the first or second blocking wall 1411 or 1412 and the first protrusion 34 is prevented from being separated from the first limiting groove 141. For example, in some embodiments, the overlap length H3 of the first protrusion 34 with the first stop wall 1411 or the second stop wall 1412 in the axial direction of the header assembly 100 may be 0.2mm, 0.3mm, 0.4mm, 0.5mm, and so forth.

Referring to fig. 10, fig. 10 is a cross-sectional view of a clasp 35 and a clasp aperture 15 provided in some embodiments of the present application. In some embodiments, the first boss 34 is fixedly coupled to the first stop 14. The first stopper 14 is configured to be opened in a first limiting groove 141 of 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 along the side wall of the current collecting assembly 100 in the circumferential direction, and the first protruding portion 34 is provided with a buckle 35 for being clamped with the clamping hole 15 along the side wall of the current collecting assembly 100 in the circumferential direction. Specifically, the first stop wall 1411 or the second stop wall 1412 of the first limiting groove 141 is provided with a clamping hole 15, and the clamping hole 15 extends along the circumferential direction of the current collecting assembly 100. When the collecting disc 30 and the cover plate 10 are installed, after the first protruding part 34 stretches into the first limiting groove 141, the buckle 35 can be clamped into the clamping hole 15 by rotating the collecting disc 30, so that on one hand, the first protruding part 34 is fixedly connected with the first stopping part 14, and when the cover plate 10 and the shell 110 are welded, the collecting disc 30 can play a role in fixing and coarsely positioning the cover plate 10, so that the cover plate 10 and the shell 110 can be welded better; on one hand, the first bulge 34 and the groove wall of the first limit groove 141 can be prevented from being scratched to generate metal scraps; on the other hand, the welding groove 321 and the explosion-proof valve 13 can be aligned better. It can be appreciated that when the buckle 35 is buckled with the buckle hole 15, a "clawing" sound is generated, so that a person skilled in the art can determine whether the current collecting tray 30 and the cover plate 10 are mounted in place through the sound, thereby improving the assembly efficiency of the current collecting tray 30 and the cover plate 10. In some embodiments, the buckle 35 may also be formed on other side walls of the first limiting groove 141 (for example, the third stopping wall 1413), and the buckle 35 is disposed at other corresponding positions of the first protruding portion 34.

Referring to fig. 4, 5, 11 and 12, fig. 11 is a cross-sectional view of the current collecting assembly 100 of fig. 3 taken along line B-B; fig. 12 is an enlarged view of the portion II in fig. 11. In some embodiments, the cover plate 10 further includes a second stop portion 16, and a second limiting space 1601 is formed between the second stop portion 16 and the main body portion 12. The manifold disk 30 also includes a second boss 36 fixedly connected to the body portion 32. The second boss 36 is spaced apart from the first boss 34. One end of the second protruding portion 36 away from the body portion 32 is located in the second limiting space 1601. The second protruding portion 36 is configured to be stopped by the second stopping portion 16, so that the second protruding portion 36 is limited by the second stopping portion 16 to move along the radial direction of the current collecting assembly 100, so that when the energy storage device 1000 is overcharged, thermally uncontrolled or mechanically vibrated, the second stopping portion 16 can limit the second protruding portion 36 to fold away from the center of the main body 12, so that the problem that the welding is unreliable at the welding seal between the main body 12 and the outer casing 110 caused by the second protruding portion 36 pressing against the outer casing 110 is avoided.

The second boss 36 is provided at the outer peripheral edge of the body portion 32. The second protruding portion 36 and the body portion 32 may be integrally formed, and the second protruding portion 36 may be configured as a folded structure that is folded from the peripheral edge of the body portion 32 toward the main body portion 12, so as to facilitate processing of the second protruding portion 36. Wherein, along the circumferential direction of the current collecting assembly 100, bending grooves 341 may be formed on two sides of the second protruding portion 36, so as to avoid cracking at the connection position between the second protruding portion 36 and the body portion 32 when the second protruding portion 36 is bent, thereby improving the connection strength between the second protruding portion 36 and the body portion 32. In some cases, the bending groove 341 may also avoid cracking at the connection between the second protruding portion 36 and the body portion 32 when the energy storage device 1000 is overcharged, thermally run away, or subjected to mechanical vibration, so as to improve the supporting capability of the second protruding portion 36 for the body portion 32.

The second stopper 16 may be configured as a second limiting groove 161 formed in the main body 12, and a second limiting space 1601 is formed in the second limiting groove 161. One end of the second protruding portion 36 away from the body portion 32 extends into the second limiting groove 161, and is disposed at an interval with the groove wall of the second limiting groove 161. The second limit groove 161 includes a fourth stopper wall 1611 on a side of the second boss 36 away from the center of the main body 12. The fourth stopping wall 1611 and the second protrusion 36 may be spaced apart from each other, and form a second gap D2. The radial length W3 of the second stopper 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 slit D2 along the radial direction of the current collecting assembly 100 is 0.1mm-3.3mm, so that a certain buffer space is provided between the second protrusion 36 and the fourth stopper wall 1611 when the energy storage device 1000 is overcharged, thermally uncontrolled or mechanically vibrated, thereby further avoiding the second protrusion 36 from pressing against the housing 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 spacing space 1601 may be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and so on; the radial length W4 of the second boss 36 may be 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc.; the radial length of the second slit D2 may be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.3mm, etc.

The second limiting groove 161 further includes a second bottom wall 1612 disposed opposite the body portion 32. The second protruding portion 36 may be spaced from the second bottom wall 1612 to prevent metal chips from being generated due to scratch between the second protruding portion 36 and the second bottom wall 1612 when the current collecting tray 30 and the cover plate 10 are mounted. The axial length H4 of the second stopper 16 in the axial direction of the header assembly 100 is 0.5mm-2.5mm. Along the axial direction of the current collecting assembly 100, the axial length H5 of the second protruding portion 36 extending into the second limiting space 1601 is 0.3mm-1.54mm, so that the connection stability of the second protruding portion 36 and the second limiting groove 161 is improved, and the second protruding portion 36 is prevented from being separated from the second limiting groove 161. The axial distance H6 between the second boss 36 and the second bottom wall 1612 may be 0.2mm-1mm. For example, in some embodiments, the axial length H4 of the second stop 16 may be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc.; the axial length H5 of the second boss 36 extending into the second limiting space 1601 may be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 2.54mm, etc.; the axial distance H6 between the second boss 36 and the second bottom wall 1612 may be 0.2mm, 0.3mm, 0.5mm, 1mm, etc.

The second limit groove 161 may be configured to open an annular groove with the main body 12, thereby facilitating the processing of the second limit groove 161. The groove depth of the first limiting groove 141 is greater than the groove depth of the second limiting groove 161 in the axial direction of the current collecting assembly 100. The axial length H7 of the first protruding portion 34 is greater than the axial length H8 of the second protruding portion 36, and the second limiting groove 161 can guide the first protruding portion 34 when the current collecting plate 30 is mounted on the cover plate 10, so that the first protruding portion 34 can conveniently extend into the first limiting groove 141. Wherein the axial length H7 of the first boss 34 along the axial direction of the header assembly 100 is 5.5mm-8.5mm; the axial length H8 of the second boss 36 in the axial direction of the header assembly 100 is 4.5mm-7.5mm. For example, in some embodiments, the axial length H7 of the first lobe 34 may be 5.5mm, 6mm, 6.5mm, 7mm, 8mm, 8.5mm, etc.; the axial length H8 of the second boss 36 may be 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 7.5mm, etc. The circumferential length of the second boss 36 in the circumferential direction of the header assembly 100 corresponds to a central angle phi 3 of 10 deg. -15 deg.. For example, the central angle Φ3 of the second convex portion 36 may be 10 °, 11 °, 12 °, 13 °, 14 °, 15 °, and so on. In some embodiments, the central angle Φ3 corresponding to the circumferential length of the second lobe 36 may be the same as the central angle Φ2 corresponding to the circumferential length of the first lobe 34.

Wherein the second boss 36 may be provided in plurality. The first bosses 34 are located between two adjacent second bosses 36 in the circumferential direction of the current collecting assembly 100. For example, the first bosses 34 may be provided in 3, the second bosses 36 may be provided in 6, and the second bosses 36 are provided at both sides of each first boss 34, respectively, in the circumferential direction of the current collecting assembly 100. It will be appreciated that the body portion 32 is configured as a sheet structure, and that the structural strength of the body portion 32 can be enhanced by providing a plurality of first protrusions 34 and a plurality of second protrusions 36 on the peripheral edge of the body portion 32, so as to prevent the body portion 32 from being accidentally bent during transportation or installation. It can be appreciated that when an unexpected situation (such as overcharge, thermal runaway, etc.) occurs in the energy storage device 1000, the electrode assembly 120 expands, and a certain buffer space is provided between the body portion 32 and the main body portion 12 through the first protrusion portion 34 and the second protrusion portion 36 disposed on the body portion 32, so that the explosion-proof valve 13 is prevented from being normally opened due to the blockage of the explosion-proof valve 13 after the electrode assembly 120 expands, and the safety of the energy storage device 1000 is further ensured. The axial distance H9 between the body portion 32 and the main body portion 12 in the axial direction of the header assembly 100 is 3.5mm to 7mm. Wherein, the axial length H7 of the first protruding portion 34 is greater than the sum of the axial length H4 of the second limiting space 1601 and the axial distance H9 between the body portion 32 and the main body portion 12, so that the first protruding portion 34 protrudes 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 3.5mm, 4mm, 5mm, 6mm, 7mm, etc.

Referring to fig. 13, fig. 14 and fig. 15 together, fig. 13 is a schematic structural diagram of a current collecting assembly 200 according to a second embodiment of the present disclosure; fig. 14 is a schematic view of the structure of the cover plate 10 in fig. 13; fig. 15 is a schematic view of the structure of the collecting tray 30 of fig. 13. 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, and specific reference may be made to the description of the current collecting assembly 100 of the first embodiment, which is not repeated herein. In contrast, the first stopper portion 14 is configured as the first stopper projection 1421 and the second stopper projection 1422 protruding from the side of the main body portion 12 facing the main body portion 32, thereby reducing the difficulty of processing the first stopper portion 14 and avoiding reducing the structural strength of the main body portion 12. The first and second stop projections 1421 and 1422 are spaced apart in the circumferential direction of the current collecting assembly 200. A first limiting space 1401 is formed between the first stop projection 1421 and the second stop projection 1422 and the main body 12. In 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, respectively. The first stop projection 1421 and the second stop projection 1422 are used for limiting the rotation of the first projection 34 along the circumferential direction of the current collecting assembly 200, so that the welding groove 321 is at least partially opposite to the main body 12 along the axial direction of the current collecting assembly 100, and further, the explosion-proof valve 13 is prevented from being triggered by mistake when the energy storage device 1000 is impacted by external force (if the energy storage device falls off accidentally). The circumferential length L1 of the first stopper 14 along the current collecting assembly 100 may be a distance of the first and second stopper protrusions 1421 and 1422 in 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 respectively disposed at intervals, and when the energy storage device 1000 is impacted by an external force, the first stop protrusion 1421 or the second stop protrusion 1422 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.

The first stopping portion 14 further includes a third stopping protrusion 1423 protruding from a side of the main body portion 12 facing the main body portion 32. The third stopping protrusions 1423 are connected to the first stopping protrusions 1421 and the second stopping protrusions 1422, respectively, at both ends in the circumferential direction of the current collecting assembly 200. The third stopping projection 1423 is located on a side of the first projection 34 away from the center of the main body 12. The first stop projection 1421, the second stop projection 1422, the third stop projection 1423, and the main body 12 together enclose a first limiting space 1401. The third stop protrusion 1423 is used for limiting 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 uncontrolled or mechanically vibrated, the third stop protrusion 1423 can limit the first protrusion 34 to fold towards a direction away from the center of the main body 12 and press against the casing 110, thereby avoiding the problem that the welding is unreliable at the welding sealing position between the casing 110 and the cover plate 10 due to the pressing of the first protrusion 34 against the casing 110, further ensuring the welding yield at the welding sealing position, and prolonging the service life of the energy storage device 1000.

Referring to fig. 16 and 17, fig. 16 is a cross-sectional view of the manifold assembly 200 of fig. 13 taken along line C-C; fig. 17 is an enlarged view at III in fig. 16. The third gap D3 is formed between the first protrusion 34 and the main body 12 at an interval, so that a buffer space is formed between the first protrusion 34 and the main body 12, and thus, when the energy storage device 1000 is overcharged, thermally uncontrolled or mechanically vibrated, the expansion of the electrode assembly 120 is absorbed, the first protrusion 34 is prevented from pressing against the casing 110, and the metal chips generated by scraping and rubbing between the first protrusion 34 and the main body 12 when the current collecting plate 30 and the cover plate 10 are mounted are prevented. Wherein the third gap D3 may be 0.2mm-1mm. For example, in some embodiments, the third gap D3 may be 0.2mm, 0.3mm, 0.5mm, 1mm, and so forth.

In the second embodiment, the overlapping length H10 of 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 protruding into the first stopper space 1401 in the first embodiment, or 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.

The first protrusion 34 and the third stop protrusion 1423 may be disposed at intervals, so that a buffer space is provided between the first protrusion 34 and the third stop protrusion 1423 when the energy storage device 1000 is overcharged, thermally run away, or mechanically vibrated, 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, so as to improve the assembly efficiency between the cover plate 10 and the current collecting plate 30. The 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.

In some embodiments, the second stop portion 16 may be configured as a fourth stop boss 1621 and a fifth stop boss 1622 protruding from a side of the body portion 12 facing the body portion 32. The fourth and fifth stop protrusions 1621 and 1622 are disposed at intervals along the circumferential direction of the current collecting assembly 200, and a second limiting space 1601 is formed between the fourth and fifth stop protrusions 1621 and 1622 and the main body 12. The second boss 36 is located between the fourth and fifth stopping protrusions 1621 and 1622 in the circumferential direction of the current collecting assembly 200, and the second boss 36 is spaced apart from the fourth and fifth stopping protrusions 1621 and 1622, respectively. The fourth stop boss 1621 and the fifth stop boss 1622 are configured to limit the rotation of the second boss 36 along the circumferential direction of the current collecting assembly 200, so that the welding groove 321 and the main body 12 are disposed opposite to each other along the axial direction of the current collecting assembly 100, thereby preventing the explosion-proof valve 13 from being erroneously triggered when the energy storage device 1000 is impacted by an external force (e.g. falls off). In some embodiments, the second stop portion 16 further includes a sixth stop protrusion 1623 protruding from a side of the body portion 12 facing the body portion 32. The sixth stopping protrusions 1623 are connected with the fourth stopping protrusions 1621 and the fifth stopping protrusions 1622, respectively, at both ends in the circumferential direction of the current collecting assembly 200. The sixth stopper boss 1623 is located on a side of the second boss 36 away from the center of the main body 12, and is spaced apart from the second boss 36. The sixth stop protrusion 1623 is configured to limit movement of the second protrusion 36 along the radial direction of the current collecting assembly 200, so that the sixth stop protrusion 1623 can limit the second protrusion 36 from being folded away from the center of the main body 12 when the energy storage device 1000 is overcharged, thermally run away, or mechanically vibrated, thereby avoiding the problem that the welding at the welding seal between the outer casing 110 and the main body 12 is unreliable due to the second protrusion 36 pressing against the outer casing 110.

The structure of the second stopping portion 16 may be similar to that of the first stopping portion 14 in the second embodiment, so as to facilitate the processing of the second stopping portion 16. The structure of the second boss 36 may be similar to that of the first boss 34 in the second embodiment, thereby facilitating the processing of the first boss 34 and the second boss 36 and reducing the processing steps of the current collecting plate 30. In the second embodiment, the specific structural parameters of the first and second bosses 34, 36 may be the same as those of the second or first bosses 36, 34 in the first embodiment.

Referring to fig. 1, 9 and 18, fig. 18 is a cross-sectional view of a current collecting assembly 300 of an energy storage device 1000 according to a third embodiment of the present disclosure. In the third embodiment, the structure of the current collecting assembly 300 is similar to that of the current collecting assembly 100 of the first embodiment, and specific reference may be made to the description of the current collecting assembly 100 of the first embodiment, which is not repeated herein. Differently, the current collecting assembly 300 further includes an insulator 40. The first stopper 14 has a stopper surface 1402 provided toward the first boss 34. The insulator 40 is located between the first boss 34 and the stop surface 1402. On the one hand, the first bulge 34 is prevented from being directly contacted with the first stop part 14 to scratch and generate scraps, so that the problem of short circuit is further caused; on the other hand, the insulating member 40 can also absorb the bending deformation of the first protruding portion 34, so as to avoid the problem that the first protruding portion 34 bends the housing 110.

In this embodiment, the insulating member 40 is accommodated in the first limiting space 1401. Specifically, the first stop portion 14 is configured to be disposed in a first limiting groove 141 of the main body 12, and the first protruding portion 34 extends into the first limiting groove 141 and is disposed at a distance from a groove wall of the first limiting groove 141. In the radial direction of the current collecting assembly 300, a groove wall of the first limiting groove 141 on a side of the first boss 34 away from the center of the main body 12 is configured as a stopper surface 1402. The insulator 40 is located in the first limiting groove 141. Along the radial direction of the current collecting assembly 300, the first protruding portion 34 and the stop surface 1402 are arranged at intervals through the insulating piece 40, so that the first protruding portion 34 and the stop surface 1402 are prevented from being directly contacted and scraped and chippings are generated, the problem of short circuit is further caused, the insulating piece 40 is simple in structure, machining forming is facilitated, the consumption is reduced, and the production cost is saved.

In some embodiments, the first stopping portion 14 is configured as a first stopping protrusion 1421, a second stopping protrusion 1422, and a third stopping protrusion 1423 protruding from a side of the main body portion 12 facing the main body portion 32. The first and second stop projections 1421 and 1422 are spaced apart in the circumferential direction of the current collecting assembly 200. The third stopping protrusions 1423 are connected to the first stopping protrusions 1421 and the second stopping protrusions 1422, respectively, at both ends in the circumferential direction of the current collecting assembly 200. The third stopping projection 1423 is located on a side of the first projection 34 away from the center of the main body 12. The third stopper projection 1423 is configured as a stopper surface 1402 toward one side surface of the first projection 34. Along the radial direction of the current collecting assembly 300, the first protruding part 34 and the third stopping protruding part 1423 are arranged at intervals through the insulating piece 40, so that the problems that the first protruding part 34 and the third stopping protruding part 1423 are directly contacted to scratch and generate scraps, and then short circuit is caused are avoided.

Illustratively, in the present embodiment, the insulator 40 is adhesively secured to the stop surface 1402. In some embodiments, the insulator 40 and the stop surface 1402 may also be secured by, but not limited to, a snap fit. The material of the insulating member 40 includes, but is not limited to, one of Polypropylene (PP), polyphenylene sulfide (Polyphenylene sulfide, PPs), polyethylene terephthalate (Polyethylene terephthalate, PET), polyimide (Polyimide, PI), polystyrene (PS), cast Polypropylene film (CPP), polyethylene naphthalate (Polyethylene naphthalate two formicacid glycol ester, PEN), polyvinyl chloride (Polyvinyl chloride, PVC), polyether ether ketone (polyether-ether-ketone, PEEK), polyether sulfone resin (Polyethersulfone resin, PES), polyphenylene sulfone resin (Polyphenylene sulfone resins, PPSM), polyethylene (Polyethylene, PE), or a combination thereof in some embodiments, the insulating member 40 is a PET film, which is a plastic film having a glossiness, excellent physical properties, high rigidity, strength and ductility, puncture resistance, friction resistance, heat resistance and ultra low temperature, chemical resistance, wear resistance, sealing property and fragrance resistance, and the insulating member 40 may be replaced with other materials as actually required PPS, PE, PVC, etc. according to the actual need.

Referring to fig. 1, 9 and 19, fig. 19 is a cross-sectional view of a current collecting assembly 400 of an energy storage device 1000 according to a fourth embodiment of the present disclosure. In the fourth embodiment, the structure of the current collecting assembly 400 is similar to that of the current collecting assembly 300 of the third embodiment, and reference may be made to the description of the current collecting assembly 300 of the third embodiment, which is not repeated herein. Differently, the insulator 40 includes a partition 41 located inside the first limiting space 1401 and a bent portion 42 located outside the first limiting space 1401. The outer periphery of the body portion 12 is provided with a welded portion 121 protruding in the radial direction of the current collecting module 400. One end of the bent portion 42 is connected to the partition portion 41, and the other end extends toward the welded portion 121 and is located between the welded portion 121 and the first protruding portion 34. The bent portion 42 and the main body 12 may be attached to each other, so as to improve the connection strength between the insulating member 40 and the main body 12, and no additional fixing structure is required, and the structure of the current collecting assembly 400 is more compact.

Wherein the welding portion 121 is for welding with the case 110. A step is formed between the welded portion 121 and the main body 12, and the housing 110 abuts on the step. Specifically, the end surface of the case 110 in the axial direction of the current collecting assembly 300 is welded with the surface of the welding part 121 in the axial direction of the current collecting assembly 300. After the case 110 is welded to the welded portion 121, the inner wall of the case 110 is attached to the outer peripheral wall of the body 12.

In some embodiments, the bending portion 42 extends to the welding portion 121 along the radial direction of the current collecting assembly 400, so as to avoid the problem of short circuit caused by scraping and scraping of the casing 110 and the main body 12 when the casing 110 is assembled with the cover plate 10. The bending portion 42 has an accommodating groove 401 formed at an end thereof adjacent to the welding portion 121, the accommodating groove 401 being formed toward the main body 12 in an opening direction, and the accommodating groove 401 being configured to accommodate welding scraps generated when the casing 110 is welded to the welding portion 121, thereby improving safety of the energy storage device 1000. The accommodating groove 401 may be formed when the case 110 and the welded portion 121 are welded. When the case 110 is welded to the welding portion 121, the welding temperature is higher than the melting point of the insulating material 40, and the bent portion 42 can be melted to form the accommodating groove 401 at a position close to the welding portion 121, so that the processing process of the accommodating groove 401 is simple. In other embodiments, the accommodating groove 401 may be formed on the insulating member 40 in advance in other manners, which is not specifically limited herein.

In some embodiments, the side of the body portion 12 facing away from the first boss 34 in the radial direction of the header assembly 400 is provided with a first chamfer structure 122. The first chamfer structure 122 is located on one side of the cover plate 10 close to the current collecting disc 30, so that the cover plate 10 can be quickly installed in the housing 110 of the energy storage device 1000, the assembly efficiency and the processing rate are improved, the scraping risk between the cover plate 10 and the housing 110 is reduced, and the safety of the energy storage device 1000 is improved. The bending portion 42 extends from the isolation portion 41 toward the first chamfer structure 122, and is attached to the first chamfer structure 122. The insulating part 40 is provided with the second chamfer structure 43 that corresponds with first chamfer structure 122 on the side that deviates from main part 12, on the one hand, based on the setting of first chamfer structure 122 and second chamfer structure 43 to can make apron 10 install fast in the shell 110 of energy memory 1000, promote packaging efficiency and processing rate, on the other hand, kink 42 extends the setting from isolation part 41 towards first chamfer structure 122, avoids shell 110 and apron 10 friction to produce the problem of fine dust and initiation short circuit.

Note that, the structure of the insulator 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 is not limited specifically.

While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (22)

1. A current collecting assembly (100, 200, 300, 400) comprising:

a cover plate (10) comprising a main body (12) and a first stop (14) connected to the main body (12);

an explosion-proof valve (13) provided on the main body (12); and

the collecting disc (30) comprises a body part (32) and a first protruding part (34), wherein the body part (32) is arranged opposite to the body part (12), and the body part (32) is provided with a welding groove (321) and a vent hole (322) positioned outside the welding groove (321); the first protruding portion (34) is fixedly connected to the body portion (32) and is used for stopping with the first stopping portion (14), so that the first protruding portion (34) is limited to move along the circumferential direction of the current collecting assembly (100, 200, 300, 400) through the first stopping portion (14), and the welding groove (321) is at least partially opposite to the explosion-proof valve (13) along the axial direction of the current collecting assembly (100, 200, 300, 400).

2. The current collecting assembly (100, 200, 300, 400) according to claim 1, wherein a first limiting space (1401) is formed between the first stop portion (14) and the main body portion (12), the first protruding portion (34) extends from the main body portion (32) toward the main body portion (12), and one end of the first protruding portion (34) away from the main body portion (32) is located in the first limiting space (1401) and is spaced from the main body portion (12) and the first stop portion (14), respectively.

3. The header assembly (100, 200, 300, 400) of claim 1, wherein an orthographic projection of the weld groove (321) along an axial direction of the header assembly (100, 200, 300, 400) overlaps an orthographic projection of the explosion-proof valve (13) along an axial direction of the header assembly (100, 200, 300, 400), an area of an overlapping region of the orthographic projection of the weld groove (321) and the orthographic projection of the explosion-proof valve (13) is a first area (S1), an area of the orthographic projection of the explosion-proof valve (13) is a second area (S2), and a ratio of the first area (S1) to the second area (S2) is 0.3-1.

4. The header assembly (100, 200, 300, 400) of claim 1, wherein an orthographic projection of the vent (322) on the body portion (12) is located outside an orthographic projection of the explosion proof valve (13) on the body portion (12).

5. The current collecting assembly (100, 200, 300, 400) according to claim 2, wherein the first stopper portion (14) is configured as a first limit groove (141) opened in the main body portion (12), the first limit groove (141) having the first limit space (1401) formed therein; one end of the first protruding portion (34) far away from the body portion (32) stretches into the first limiting groove (141), and is arranged at intervals with the groove wall of the first limiting groove (141).

6. The current collecting assembly (100, 200, 300, 400) according to claim 2, wherein the first stopper portion (14) is configured as a first stopper projection (1421) and a second stopper projection (1422) that are provided protruding to a side of the main body portion (12) facing the main body portion (32), the first stopper projection (1421) and the second stopper projection (1422) being disposed at intervals along a circumferential direction of the current collecting assembly (100, 200, 300, 400), the first stopper projection (1421), the second stopper projection (1422) and the main body portion (12) forming the first stopper space (1401) therebetween; 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 respectively spaced from the first stop protrusion (1421) and the second stop protrusion (1422).

7. The current collecting assembly (100, 200, 300, 400) according to claim 6, wherein the first stopper portion (14) further comprises a third stopper protrusion (1423) protruding from a side of the main body portion (12) facing the main body portion (32), both ends of the third stopper protrusion (1423) in a circumferential direction of the current collecting assembly (100, 200, 300, 400) are connected with the first stopper protrusion (1421) and the second stopper protrusion (1422), respectively, the third stopper protrusion (1423) is located on a side of the first protrusion (34) away from a center of the main body portion (12) and is spaced apart from the first protrusion (34), and the third stopper protrusion (1423) is for limiting movement of the first protrusion (34) in a radial direction of the current collecting assembly (100, 200, 300, 400).

8. The header assembly (100, 200, 300, 400) of claim 2, wherein the first stop (14) corresponds to a central angle (Φ1) of 5 ° -20 ° along a circumferential length of the header assembly (100, 200, 300, 400) in a circumferential direction; -the radial length (W1) of the first stop (14) along the radial direction of the collecting assembly (100, 200, 300, 400) is 0.3mm-3.5mm; -the axial length (H1) of the first stop (14) along the axial direction of the collecting assembly (100, 200, 300, 400) is 1.5mm-3.5mm; along the axial direction of the current collecting assembly (100, 200, 300, 400), the axial length (H2) of the first protruding part (34) extending into the first limiting space (1401) is 0.5mm-2.54mm.

9. The header assembly (100, 200, 300, 400) of claim 2, wherein the first stop (14) has a circumferential length (L1) along a circumferential direction of the header assembly (100, 200, 300, 400) of 4.5mm to 7.5mm.

10. The header assembly (100, 200, 300, 400) of claim 2, wherein the first boss (34) is movable within the first spacing space (1401).

11. The header assembly (100, 200, 300, 400) of claim 1, wherein the first boss (34) is fixedly connected to the first stopper (14).

12. The current collecting assembly (100, 200, 300, 400) according to claim 11, wherein the first stop portion (14) is configured as a first limit groove (141) opened in the main body portion (12), a clamping hole (15) is opened along a side wall of the current collecting assembly (100, 200, 300, 400) in a circumferential direction, and a buckle (35) for being clamped with the clamping hole (15) is provided along a side wall of the first protruding portion (34) in 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, wherein an end of the first boss (34) remote from the body portion (32) is spaced from the body portion (12).

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

15. The header assembly (100, 200, 300, 400) of claim 2, wherein the header assembly (100, 200, 300, 400) further comprises an insulator (40), the first stop (14) having a stop surface (1402) disposed toward the first boss (34), the insulator (40) being located between the first boss (34) and the stop surface (1402).

16. The current collecting assembly (100, 200, 300, 400) according to claim 15, wherein the insulator (40) comprises a partition portion (41) located in the first limiting space (1401) and a bent portion (42) located outside the first limiting space (1401), a welding portion (121) is provided protruding from the outer periphery of the main body portion (12) in the radial direction of the current collecting assembly (100, 200, 300, 400), one end of the bent portion (42) is connected to the partition portion (41), and the other end is provided extending toward the welding portion (121) and located between the welding portion (121) and the first protruding portion (34).

17. The current collecting assembly (100, 200, 300, 400) according to claim 16, wherein the bending portion (42) extends to the welding portion (121) along a radial direction of the current collecting assembly (100, 200, 300, 400), a receiving groove (401) is formed at one end of the bending portion (42) close to the welding portion (121), and an opening direction of the receiving groove (401) is arranged towards the main body portion (12).

18. The header assembly (100, 200, 300, 400) of claim 1, wherein the cover plate (10) further includes a second stopper portion (16), a second spacing space (1601) being formed between the second stopper portion (16) and the body portion (12); the collecting disc (30) further comprises a second protruding part (36) fixedly connected to the body part (32), and the second protruding part (36) is arranged at intervals from the first protruding part (34); one end of the second protruding portion (36) away from the body portion (32) is located in the second limiting space (1601), and the second stopping portion (16) limits movement of the second protruding portion (36) along the radial direction of the current collecting assembly (100, 200, 300, 400).

19. The current collecting assembly (100, 200, 300, 400) according to claim 18, wherein the second stopper portion (16) is configured as a second limit groove (161) opened from a side of the main body portion (12) toward the main body portion (32) in a direction away from the main body portion (32), the second limit groove (161) having the second limit space (1601) formed therein; one end of the second protruding part (36) far away from the body part (32) stretches into the second limit groove (161); or alternatively, the process may be performed,

The second stopping part (16) is configured to be arranged to be protruded on a fourth stopping protrusion (1621) and a fifth stopping protrusion (1622) on one side of the main body part (12) facing the main body part (32), the fourth stopping protrusion (1621) and the fifth stopping protrusion (1622) are arranged at intervals along the circumferential direction of the current collecting assembly (100, 200, 300, 400), and the second limiting space (1601) is formed between the fourth stopping protrusion (1621), the fifth stopping protrusion (1622) and the main body part (12); the second boss (36) is located between the fourth stop boss (1621) and the fifth stop boss (1622) in a circumferential direction of the current collecting assembly (100, 200, 300, 400).

20. The header assembly (100, 200, 300, 400) of claim 18, wherein said second bosses (36) are provided in a plurality; the first bosses (34) are located between adjacent two of the second bosses (36) in a circumferential direction of the current collecting assembly (100, 200, 300, 400).

21. An energy storage device (1000) comprising a housing (110), an electrode assembly (120), and a current collecting assembly (100, 200, 300, 400) according to any one of claims 1-20; the current collecting assembly (100, 200, 300, 400) is fixedly connected with the shell (110) in a sealing way to form a containing cavity (130), and the electrode assembly (120) is contained in the containing cavity (130).

22. A powered device comprising the energy storage device (1000) of claim 21, the energy storage device (1000) providing electrical energy to the powered device.

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