End cover assembly, energy storage device and electrical equipment

Abstract

The present application discloses an end cover assembly, an energy storage device, and an electrical equipment. The end cover assembly includes a cover member and a current collecting member. The cover member includes a cover body and a stop portion provided at the edge portion of the cover body. The current collecting member includes a current collecting disk body and at least one flanging provided at the edge portion of the current collecting disk body. The current collecting disk body is convexly provided with a boss for supporting the cover body. The cover body and the current collecting disk body are spaced apart. The flanging extends from the current collecting disk body towards the cover member and extends into the limiting space. The flanging is spaced apart from the stop portion and is also spaced apart from the cover body. By using the end cover assembly of the present application, when the energy storage device is overcharged, thermally out of control, or mechanically vibrated, the stop portion can limit the deformation and expansion of the flanging, so as to avoid the problem that the flanging is pressed and folded towards the outer shell of the energy storage device, resulting in an unreliable welding seal between the cover member and the outer shell, and also avoid the interference problem between the flanging and the cover member during the assembly process, thereby ensuring the welding yield, prolonging the service life, improving the assembly efficiency, and enhancing the safety performance.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly relates to an end cover assembly, an energy storage device, and an electrical device. Background Art

[0002] Energy storage batteries have been widely used due to their advantages such as high energy density, high working voltage, and long service life. With the increasing development of electric devices, there are high requirements for the performance of energy storage batteries that provide energy for them, especially for the battery cycle performance. The welding yield of energy storage batteries is an important parameter to ensure the battery cycle performance. A low welding yield will cause the cycle attenuation to be too fast, resulting in the rapid attenuation of the service life of energy storage batteries.

[0003] An energy storage battery includes a housing, a current collecting component, and a cover component. The cover component is welded to the housing to encapsulate the current collecting component. However, when the energy storage battery is overcharged, thermally out of control, or mechanically vibrated, a huge impact force will be generated. Therefore, the current collecting component is prone to deformation, which affects the welding sealing yield between the cover component and the housing. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide an end cover assembly, an energy storage device, and an electrical device to solve the technical problem of low welding sealing yield in the prior art.

[0005] In a first aspect, an embodiment of the present application provides an end cover assembly, including a cover component and a current collecting component. The cover component includes a cover body and a stop portion provided at an edge portion of the cover body. The current collecting component includes a current collecting disk body and at least one folded edge provided at an edge portion of the current collecting disk body. The current collecting disk body is convexly provided with a boss for supporting the cover body. The cover body and the current collecting disk body are spaced apart. The folded edge extends from the current collecting disk body towards the cover component and extends into the limiting space. The folded edge is spaced apart from the stop portion and is also spaced apart from the cover body.

[0006] The end cap assembly provided by the embodiment of the present application, on the one hand, based on extending the flanging from the current collector body towards the cover component and extending it into the limiting space, so that when the energy storage device is overcharged, thermally out of control or mechanically vibrated, the stop portion can limit the flanging from being folded towards the outer shell of the energy storage device, so as to avoid the problem of unreliable welding at the welded seal between the cover component and the outer shell, thereby ensuring the welding yield of the welded seal and extending the service life of the energy storage device. On the second hand, based on arranging the flanging and the stop portion at intervals and arranging them at intervals with the cover body, so that when the energy storage device is overcharged, thermally out of control or mechanically vibrated, it is ensured that there is a certain buffer space for the deformation and expansion of the edge portion of the current collector body and the flanging, avoiding the interference problem between the flanging and the cover component during the assembly process, and avoiding the scraping between the flanging and the cover body to generate debris, thereby ensuring the welding yield of the welded seal, improving the assembly efficiency and improving the safety performance of the energy storage device. On the third hand, based on protruding a boss for supporting the cover body on the current collector body to form a gap between the cover component and the current collector component, so as to absorb the expansion generated by the battery cells of the energy storage device. On the fourth hand, based on arranging flanging at the edge portion of the current collector body, thereby improving the strength of the four peripheries of the current collector component, and further ensuring the flatness of the current collector component.

[0007] Combined with the first aspect, in some implementation manners of the first aspect, in the axial direction of the end cap assembly, the distance between the cover body and the flanging is a first distance, and the first distance is 0.01 mm - 0.31 mm, so as to avoid the scraping between the flanging and the cover body to generate debris, and avoid the interference problem between the flanging and the cover component during the assembly process, thereby improving the assembly efficiency and improving the safety performance of the energy storage device.

[0008] Combined with the first aspect, in some implementation manners of the first aspect, in the axial direction of the end cap assembly, the depth of the flanging extending into the limiting space is a second distance, and the second distance is 0.5 mm - 2.54 mm, so as to prevent the flanging from separating from the stop, so as to ensure that the stop portion can limit the flanging from being folded towards the outer shell, thereby ensuring the welding yield of the welded seal and extending the service life of the energy storage device.

[0009] Combined with the first aspect, in some implementation manners of the first aspect, along the radial direction of the end cap assembly, the distance between the stop portion and the flanging is a third distance, and the third distance is 0.15 mm - 0.5 mm. On the one hand, it ensures the strength of the four peripheries of the current collector body, and when the energy storage device is overcharged, thermally out of control or mechanically vibrated, there is a certain buffer space for the deformation and expansion of the flanging, so as to avoid the problem of the flanging folding the outer shell; on the other hand, it avoids the interference problem between the flanging and the stop portion during the assembly process and improves the assembly efficiency between the cover component and the current collector component.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the stop portion has a stop surface that is spaced apart from the folded edge, and the end cover assembly further includes an insulating member, which is located between the folded edge and the stop surface. On the one hand, the insulating member prevents the folded edge from directly contacting the stop portion to cause scratches and generate debris, thereby causing a short circuit; on the other hand, the insulating member can also absorb the bending deformation of the folded edge, thereby preventing the folded edge from crushing the outer shell.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the insulating part is accommodated in the limiting space, so as to avoid direct contact between the folded edge and the stop portion to cause scratches and debris, thereby causing a short circuit. The insulating part has a simple structure, is easy to process and shape, and reduces usage, thereby saving production costs.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the insulating member includes an isolating portion located within the limiting space and a bending portion located outside the limiting space, and a welding portion is convexly provided on the outer periphery of the cover body along the radial direction of the end cover assembly, one end of the bending portion is connected to the isolating portion, and the other end extends toward the welding portion, and the bending portion is located between the welding portion and the folded edge, thereby increasing the contact area between the insulating member and the stop portion, thereby improving the connection strength between the insulating member and the stop portion, and further avoiding direct contact between the stop portion and the outer shell to cause scratches and generate debris, thereby causing a short circuit.

[0013] In combination with the first aspect, in certain implementations of the first aspect, a first chamfer structure is provided on the side of the stop portion away from the folded edge along the radial direction of the end cover assembly, and the bent portion extends to the first chamfer structure along the radial direction of the end cover assembly. Based on the setting of the first chamfer structure, the contact area between the insulating part and the stop portion is further increased, the connection strength between the insulating part and the stop portion is provided, and the installation of the insulating part is facilitated.

[0014] In combination with the first aspect, in certain implementations of the first aspect, a second chamfer structure corresponding to the first chamfer structure along the axial direction of the end cover assembly is provided on the side of the insulating part facing away from the stop portion. On the one hand, based on the settings of the first chamfer structure and the second chamfer structure, the cover component can be quickly installed in the housing of the energy storage device, thereby improving assembly efficiency and processing speed. On the other hand, the bending portion extends from the isolation portion toward the first chamfer structure to avoid the problem of short circuit caused by friction between the housing and the cover component to generate fine chips.

[0015] In combination with the first aspect, in some implementations of the first aspect, a receiving groove is provided at one end of the bent portion close to the welding portion, and the opening direction of the receiving groove faces the cover body. On the one hand, when the cover component and the current collector component are sealed and welded, since the welding temperature is higher than the melting point of the insulating part, the bent portion of the insulating part can be melted at a position close to the welding portion to form a receiving groove for collecting welding chips, thereby improving the safety of the energy storage device. On the other hand, the insulating part is melted by the welding temperature to form a receiving groove, thereby simplifying the processing technology of the receiving groove of the insulating part and improving the production efficiency.

[0016] In combination with the first aspect, in some implementations of the first aspect, the stopping portion is configured as a flange provided on the surface of the cover body close to the current collector component, and the stopping surface is configured as the inner peripheral surface of the flange facing the folded edge. Thus, when the energy storage device is overcharged, thermally out of control or mechanically vibrated, the flange can limit the folded edge from being pressed and folded towards the housing, and ensure the structural strength of the edge portion of the cover component.

[0017] In combination with the first aspect, in some implementations of the first aspect, the stopping portion is configured as a stopping groove, the stopping groove is provided on the end surface of the cover body close to the current collector component, the folded edge extends into the stopping groove, the internal space of the stopping groove is the limiting space, and the stopping surface is configured as the outer groove wall of the stopping groove facing the folded edge. Thus, when the energy storage device is overcharged, thermally out of control or mechanically vibrated, the outer groove wall of the stopping groove can limit the folded edge from being pressed and folded towards the housing, and simplify the processing technology of the cover component.

[0018] In combination with the first aspect, in some implementations of the first aspect, the stopping groove is configured as an annular groove, and the annular groove is provided at the circumferential edge portion of the surface of the cover body facing the current collector component, thereby facilitating the processing and forming of the annular groove, facilitating the assembly of the cover component and the current collector component, and increasing the stopping range between the folded edge of the current collector component and the stopping portion.

[0019] In combination with the first aspect, in some implementations of the first aspect, the end cover assembly further includes an explosion-proof valve provided on the cover component, and the stopping groove is arranged around the explosion-proof valve, thereby simplifying the overall structure of the cover component.

[0020] In combination with the first aspect, in some implementations of the first aspect, rounded corners are formed at the edge sharp corners of the folded edge and / or the stopping portion, thereby avoiding the problem that the folded edge and / or the stopping portion are scratched to generate debris.

[0021] In combination with the first aspect, in some implementations of the first aspect, the current collecting component includes a plurality of the flanges, and the plurality of flanges are arranged on the current collecting disk body at intervals in the circumferential direction of the current collecting disk body, thereby saving costs and ensuring the structural strength of the four peripheral edges of the current collecting component.

[0022] In combination with the first aspect, in some implementations of the first aspect, the extending direction of the flange forms an angle with the extending direction of the current collecting disk body, and the angle is a right angle, thereby ensuring the structural strength of the four peripheral edges of the current collecting component, while being able to avoid the flange pressing and folding the outer shell, and further ensuring the welding yield at the welded seal; or, the angle is an acute angle. First, it ensures the structural strength of the four peripheral edges of the current collecting component. Second, it can further avoid the flange pressing and folding the outer shell, and can also reduce the risk of the flange rubbing against the cover component, thereby ensuring the welding yield at the welded seal and improving safety; Third, it avoids interference between the flange of the current collecting component and the cover component, and improves the assembly efficiency between the cover component and the current collecting component.

[0023] In the second aspect, an embodiment of the present application provides an energy storage device, including an outer shell, an electrode assembly, and the end cover assembly as described above; the end cover assembly is hermetically and fixedly connected to the outer shell to form a receiving cavity, and the electrode assembly is received in the receiving cavity, extending the service life of the energy storage device.

[0024] In the third aspect, an embodiment of the present application provides an electrical device, including the energy storage device as described above, and the energy storage device provides electrical energy for the electrical device, extending the service life of the energy storage device. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a household energy storage scenario diagram of the structural schematic diagram of the energy storage device provided by the embodiment of the present application.

[0027] Figure 2 It is the structural schematic diagram of the energy storage device provided by the embodiment of the present application.

[0028] Figure 3 Is Figure 2 The structural schematic diagram of the first embodiment of the end cover assembly of the energy storage device in

[0029] Figure 4 Is Figure 2Partial cross-sectional view of the energy storage device therein.

[0030] Figure 5 is Figure 4 An enlarged view of part I therein.

[0031] Figure 6 is Figure 3 Exploded view of the end cap assembly therein from the first perspective.

[0032] Figure 7 is Figure 3 Exploded view of the end cap assembly therein from the second perspective.

[0033] Figure 8 is Figure 2 Schematic structural diagram of the second embodiment of the end cap assembly of the energy storage device therein.

[0034] Figure 9 is Figure 8 Partial sectional view of the end cap assembly therein.

[0035] Figure 10 is Figure 2 Schematic structural diagram of the third embodiment of the end cap assembly of the energy storage device therein.

[0036] Figure 11 is Figure 2 Schematic structural diagram of the fourth embodiment of the end cap assembly of the energy storage device therein.

[0037] Figure 12 is Figure 2 Schematic structural diagram of the fifth embodiment of the end cap assembly of the energy storage device therein.

[0038] Description of main component symbols: User load 1; User load 2; Electric energy conversion device 3; Energy storage device 1000; End cover assembly 100; End cover assembly 200; End cover assembly 300; End cover assembly 400; End cover assembly 500; Housing 110; Connection surface 1101; Opening 111; Receiving groove 112; Electrode assembly 120; Receiving cavity 130; Cover component 10; Through hole 101; Mounting hole 102; Cover body 12; Surface 1201; Outer peripheral surface 1202; First convex part 121; Stopping part 14; Flange 140; First end face 1401; Inner peripheral surface 1402; Outer peripheral surface 1403; Stopping surface 144; First chamfer structure 145; Second convex part 146; Limiting space 16; Welding part 18; Welding surface 181; Stopping groove 150; Stopping groove 160; Inner groove wall 141; Inner groove wall 161; Outer groove wall 142; Outer groove wall 162; First wall 1621; Second wall 1622; Groove bottom wall 143; Groove bottom wall 163; Current collecting component 30; Current collecting disk body 32; First disk surface 3201; Second disk surface 3202; Edge surface 3203; Bending groove 3204; Welding groove 3205; Ventilation hole 3206; Welding protrusion 321; Flanging 34; Second end face 3401; Contact surface 3402; Boss 36; Support boss 361; Connection boss 362; Insulating part 40; Isolation part 41; Bent part 42; Second chamfer structure 43; Receiving groove 402; Explosion-proof valve 50; Central axis P; Axial direction X; Radial direction Y; Circumferential direction Z; First distance D1; Second distance D2; Third distance D3; First height L11; Second height L21; First thickness L12; Second thickness L22; First length L13; Second length L23; Groove width W; Depth H.

[0039] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific embodiments

[0040] 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. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0041] It should be understood that the terms in the specification, claims and the above-mentioned drawings of the present application are only for describing specific embodiments and are not intended to limit the present application. The terms "first", "second", etc. in the specification, claims and the above-mentioned drawings of the present application are used to distinguish different objects and are not used to describe a specific order. Unless otherwise clearly stated in the context, the singular forms "a" and "the" are also intended to include the plural forms. The term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. In addition, the present application can be implemented in many different forms and is not limited to the embodiments described in this embodiment. The purpose of providing the following specific embodiments is to facilitate a clearer and more thorough understanding of the disclosed content of the present application. The words indicating directions such as up, down, left, and right are only in terms of the positions of the shown structures in the corresponding drawings. In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set on..." should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0042] The subsequent description in the specification is for the preferred embodiments of implementing the present application. However, the above description is for the purpose of explaining the general principles of the present application and is not intended to limit the scope of the present application. The protection scope of the present application shall be determined by what is defined in the appended claims.

[0043] First, the basic concepts involved in the embodiments of the present application will be briefly introduced below.

[0044] The term "energy storage device" refers to a device that converts the chemical energy stored in itself into electrical energy, that is, a device that converts the pre-stored energy into externally available electrical energy.

[0045] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the energy utilization rate, it is necessary to store one form of energy in the same or converted into another form of energy through a medium or device, and then release it in a specific energy form based on future application needs. As is well known, the current main way to generate green electricity is to develop green energy such as photovoltaic and wind power to replace fossil energy. Currently, the generation of green electricity generally depends on photovoltaic, wind power, water potential, etc. However, wind energy and solar energy generally have problems such as strong intermittency and large volatility, which will cause the power grid to be unstable. There is not enough electricity during peak electricity consumption, and too much electricity during off-peak electricity consumption. The unstable voltage will also damage the electricity. Therefore, due to insufficient electricity demand or insufficient grid acceptance capacity, the problem of "abandoning wind and light" may occur. To solve these problems, energy storage is required. That is, the electric energy is converted into other forms of energy through physical or chemical means and stored, and the energy is converted into electric energy and released when needed. Simply put, energy storage is similar to a large "portable power bank". When photovoltaic and wind energy are sufficient, the electric energy is stored, and the stored electricity is released when needed.

[0046] Taking electrochemical energy storage as an example, this solution provides an energy storage device. There is a chemical battery in the energy storage device. It mainly uses the chemical elements in the chemical battery as the energy storage medium. The charge and discharge process is accompanied by chemical reactions or changes of the energy storage medium. Simply put, the electric energy generated by wind energy and solar energy is stored in the chemical battery, and the stored electricity is released when the external electricity usage reaches the peak, or transferred to places with a shortage of electricity for further use.

[0047] The current energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid connection energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0048] (1) The large energy storage container applied in the grid side energy storage scenario can be used as a high-quality active and reactive power regulation power source in the grid, realizing the load matching of electric energy in time and space, enhancing the consumption capacity of renewable energy, and being of great significance in the standby of the power grid system, relieving the power supply pressure during peak loads, and peak shaving and frequency modulation;

[0049] (2) Medium and small-sized energy storage cabinets applied to industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side and household small-sized energy storage boxes applied to household energy storage scenarios on the user side mainly operate in the mode of "peak shaving and valley filling". Due to the large price difference in electricity charges at peak and valley positions according to electricity consumption demands, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, they then discharge the electricity in the energy storage devices for use to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidences of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0050] The embodiments of the present application are described by taking the household energy storage scenario in user-side energy storage as an example. Figure 1 It is a household energy storage scenario diagram of the energy storage device 1000 provided by the embodiments of the present application. It should be noted that the energy storage device 1000 of the present application is not limited to the household energy storage scenario.

[0051] The present application provides a household energy storage system, which includes a user load 1 (such as but not limited to street lights), a user load 2 (such as but not limited to household appliances), an electric energy conversion device 3 (such as but not limited to photovoltaic panels), and an energy storage device 1000, etc. The energy storage device 1000 is a small-sized energy storage box and can be installed on an outdoor wall in a wall-mounted manner. Specifically, the photovoltaic panel can convert solar energy into electric energy during the low electricity price period, and the energy storage device 1000 is used to store the electric energy and supply it to street lights and household appliances for use during the peak electricity price period, or supply power when the power grid is powered off / out of power.

[0052] It can be understood that the energy storage device 1000 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. When the energy storage device 1000 is a single cell, it can be a square battery. The single cell includes at least one of but is not limited to power batteries, fuel cells, supercapacitors, etc. Power batteries include but are not limited to lithium-ion power batteries, nickel metal hydride power batteries, and supercapacitors, etc.

[0053] The electrical equipment in the embodiments of the present application includes but is not limited to portable devices such as Bluetooth headsets, mobile phones, digital devices, and tablet computers, as well as large equipment such as electric motorcycles, electric vehicles, and energy storage power stations. The embodiments of the present application do not make limitations. The energy storage device provides electric energy for the electrical equipment.

[0054] Understandably, in order for those skilled in the art to better understand the energy storage device, the energy storage device is described in detail by taking a single battery as an example. It should be noted that taking the energy storage device as a single battery is only for illustration, and the present application does not make specific limitations. For example, the product type of the energy storage device can also be set according to actual needs. Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the energy storage device 1000 provided by an embodiment of the present application. The energy storage device 1000 includes an end cover assembly 100, a housing 110, and an electrode assembly 120. The end cover assembly 100 is hermetically and fixedly connected to the housing 110 to form a receiving cavity 130. The electrode assembly 120 is received in the receiving cavity 130, thereby extending the service life of the energy storage device 1000. Understandably, by way of example, in the present embodiment, the energy storage device 1000 is a cylindrical battery. In some embodiments, the energy storage device 1000 can also be, but is not limited to, a square battery. The following takes the cylindrical battery as an example for detailed description.

[0055] The housing 110 has an opening 111 and a receiving groove 112 communicating with the opening 111, and the electrode assembly 120 is received in the receiving groove 112. The end cover assembly 100 covers the opening 111 of the housing 110 to form the receiving cavity 130. The end cover assembly 100 includes a cover member 10 and a current collector member 30. The current collector member 30 is also received in the receiving groove 112 and is located between the cover member 10 and the electrode assembly 120. The cover member 10 covers the opening 111 of the housing 110. By way of example, in the present embodiment, at least a part of the structure of the cover member 10 is inserted into the receiving groove 112 of the housing 110 and welded to the housing 110, thereby realizing the sealed connection between the cover member 10 and the housing 110. Understandably, the receiving cavity 130 is also used to store the electrolyte so that the electrolyte can infiltrate the electrode assembly 120. The electrode assembly 120 includes a battery cell and a tab.

[0056] It should be noted that Figure 2 the purpose is only to schematically describe the arrangement manner among the end cover assembly 100, the housing 110, and the electrode assembly 120, and does not specifically limit the connection positions, connection relationships, and specific structures of each component. Figure 1 is only the structure of the energy storage device 1000 schematically shown in the embodiment of the present application, and does not constitute a specific limitation on the energy storage device 1000. In other embodiments of the present application, the energy storage device 1000 may include more or fewer components than Figure 2 shown, or combine some components, or different components. For example, the energy storage device 1000 may also include, but is not limited to, a seal, etc.

[0057] It should be noted that the term "axial direction X" used in the embodiments and claims of this article refers to the direction parallel to the central axis P of the energy storage device 1000. The term "radial direction Y" refers to the direction perpendicular to the central axis P of the energy storage device 1000, that is, the radial direction along the cross-section of the energy storage device 1000. The term "circumferential direction Z" refers to the circumferential direction of the energy storage device 1000, that is, the direction surrounding the central axis P of the energy storage device 1000. Among them, 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 end cover assembly 100 is parallel to the axial direction X, the radial direction of the end cover assembly 100 is parallel to the radial direction Y, and the circumferential direction of the end cover assembly 100 is parallel to the circumferential direction Z.

[0058] Please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 is Figure 2 a schematic structural view of the first embodiment of the end cover assembly 100 of the energy storage device 1000 in Figure 4 is Figure 2 a partial cross-sectional view of the energy storage device 1000 in Figure 5 is Figure 4 an enlarged view of part I in . The end cover assembly 100 includes a cover member 10 and a current collecting member 30. The cover member 10 includes a cover body 12. A boss 36 for supporting the cover body 12 protrudes from the middle of the current collecting disk body 32. The cover body 12 is spaced apart from the current collecting disk body 32, so that the gap formed between the cover body 12 and the current collecting disk body 32 can absorb the expansion generated by the electrode assembly 120 of the energy storage device 1000.

[0059] It can be understood that when the energy storage device 1000 is overcharged, thermally out of control, or mechanically vibrated, a huge impact force will be generated, so that the strength of the four peripheral edges of the current collecting member 30 is insufficient and it folds towards the cover member 10. Optionally, in some embodiments, the current collecting member 30 includes a current collecting disk body 32 and at least one folded edge 34 provided at the edge portion of the current collecting disk body 32, so as to improve the strength of the four peripheral edges of the current collecting member 30, and further ensure the flatness of the current collecting member 30.

[0060] It can be understood that in the existing energy storage device, when it is overcharged, thermally out of control, or mechanically vibrated, the folded edge of the current collecting member is easily pressed and folded towards the inner wall of the outer shell of the energy storage battery, thus affecting the yield of the welding seal between the cover member and the outer shell. Therefore, a stop portion 14 is provided at the edge portion of the cover body 12 in this application. The folded edge 34 extends outward from the current collecting disk body 32 towards the cover member 10 and extends into the limiting space 16. The folded edge 34 is spaced apart from the stop portion 14 and is also spaced apart from the cover body 12.

[0061] For the end cap assembly 100 provided by the embodiments of the present application, on the first hand, based on the fact that the stop portion 14 of the cover member 10 is arranged on the outer side of the flange 34 of the current collector member 30 away from the boss 36 and is used to stop against the flange 34, when the energy storage device 1000 is overcharged, thermally out of control or mechanically vibrated, the stop portion 14 can limit the flange 34 from being folded towards the outer shell 110 of the energy storage device 1000, thereby avoiding the problem of unreliable welding at the welded seal between the cover member 10 and the outer shell 110, further ensuring the welding yield of the welded seal and extending the service life of the energy storage device 1000. On the second hand, based on the fact that in the axial direction of the end cap assembly 100, the flange 34 is suspended relative to the cover member 10, when the energy storage device 1000 is overcharged, thermally out of control or mechanically vibrated, it ensures that there is a certain buffer space for the deformation and expansion of the edge portion of the current collector disk body 32 and the flange 34, avoiding the interference problem between the flange 34 and the cover member 10 during the assembly process, and avoiding the scraping between the flange 34 and the cover body 12 to generate debris, further ensuring the welding yield of the welded seal, improving the assembly efficiency and improving the safety performance of the energy storage device 1000.

[0062] Along the radial direction Y of the end cap assembly 100, a welding portion 18 is convexly provided on the outer periphery of the cover body 12. Along the radial direction Y of the end cap assembly 100, the welding portion 18 is located outside the stop portion 14. The welding portion 18 stops against the opening 111 of the outer shell 110, thereby realizing the positioning and installation of the cover member 10, improving the installation efficiency, and further ensuring the sealing performance of the welded seal. The welding portion 18 includes a welding surface 181 in contact with the outer shell 110 along the axial direction X of the end cap assembly 100. The outer shell 110 includes a connection surface 1101 welded to the welding portion 18. Among them, the welding method between the outer shell 110 and the cover member 10 can be but is not limited to laser welding, ultrasonic welding, etc., and the present application does not make specific limitations. It can be understood that since the welding surface 181 of the cover member 10 and the connection surface 1101 of the outer shell 110 are welded in the radial direction Y of the energy storage device 1000, if the flange 34 is folded towards the outer shell 110, it is easy to appear the phenomenon of poor welding at the welded seal between the outer shell 110 and the cover member 10. Therefore, in the present application, a stop portion 14 is provided between the outer shell 110 and the flange 34 to ensure the welding yield of the welded seal between the outer shell 110 and the cover member 10.

[0063] Understandably, both the cover member 10 and the current collector member 30 are made of metal, and the materials of the cover member 10 and the current collector member 30 are independently but not limited to aluminum or aluminum alloy. Since the aluminum material is relatively soft, debris is likely to be generated after the cover member 10 and the current collector member 30 are scratched. Optionally, in some embodiments, the distance between the cover body 12 and the flanging 34 is the first distance D1, and the first distance D1 is 0.01 mm - 0.31 mm, so as to avoid scratching between the flanging 34 and the cover body 12 to generate debris, and to avoid interference between the flanging 34 and the cover member 10 during the assembly process, thereby improving the assembly efficiency and the safety performance of the energy storage device 1000. For example, in some embodiments, the first distance D1 can be 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm, etc. It should be noted that the distance between the cover body 12 and the flanging 34 is only for illustration and does not constitute a specific limitation. The distance between the cover body 12 and the flanging 34 needs to be designed according to the actual product design.

[0064] In the axial direction X of the end cover assembly 100, the depth of the flanging 34 extending into the limiting space 16 is the second distance D2, and the second distance D2 is 0.5 mm - 2.54 mm. By designing the depth of the flanging 34 extending into the limiting space 16, the flanging 34 can be prevented from disengaging from the stop of the stop portion 14, so as to ensure that the stop portion 14 can limit the flanging 34 from being folded towards the outer shell 110, thereby ensuring the welding yield of the welded seal and extending the service life of the energy storage device 1000. For example, in some embodiments, the second distance D2 can be 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm, etc. It should be noted that the second distance D2 is only for illustration and does not constitute a specific limitation. The second distance D2 needs to be designed according to the actual product design.

[0065] Specifically, in this embodiment, the stop portion 14 is configured as a flange 140 provided on the surface 1201 of the cover body 12 close to the current collector member 30. Thus, when the energy storage device 1000 is overcharged, thermally out of control or mechanically vibrated, the flange 140 can limit the flanging 34 from being folded towards the outer shell 110, and the structural strength of the edge portion of the cover member 10 is ensured. The flange 140 is configured as a closed-loop structure, which is convenient for the processing technology of the flange 140. In some embodiments, the flange 140 can also be configured as an open-loop structure, so as to save the amount of the flange 140 and reduce the production cost.

[0066] In the axial direction X of the end cap assembly 100, the height of the hem 34 is the first height L11, and the size of the flange 140 is the second height L21. The sum of the first height L11 and the second height L21 is greater than the first distance D1. Optionally, in some embodiments, the first height L11, the second height L21, and the first distance D1 satisfy the relationship: 2.54 ≥ L11 + L21 - D1 ≥ 0.5 mm. Specifically, the cover body 12 includes a surface 1201 facing the current collector member 30, and a flange 140 is provided at the edge portion of the surface 1201. The stop portion 14 includes a first end face 1401 facing away from the cover body 12, and the hem 34 includes a second end face 3401 facing away from the current collector disk body 32. The current collector disk body 32 includes a first disk surface 3201 facing the cover member 10. In the axial direction of the end cap assembly 100, the first end face 1401 is located between the second end face 3401 and the first disk surface 3201. The distance between the first end face 1401 and the second end face 3401 is the second distance D2.

[0067] In this embodiment, along the radial direction Y of the end cap assembly 100, the distance between the stop portion 14 and the hem 34 is the third distance D3, and the third distance D3 is 0.15 mm - 0.5 mm. On the one hand, it ensures the strength of the four peripheral edges of the current collector disk body 32, and when the energy storage device 1000 is overcharged, thermally out of control, or mechanically vibrated, there is a certain buffer space for the deformation and expansion of the hem 34, thus avoiding the problem of the hem 34 pressing and folding the outer shell 110; on the other hand, it avoids the interference problem between the hem 34 and the stop portion 14 during the assembly process, and improves the assembly efficiency between the cover member 10 and the current collector member 30. For example, in some embodiments, the third distance D3 can be 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, etc. It should be noted that the third distance D3 is only for illustration and does not constitute a specific limitation. The third distance D3 needs to be designed according to the actual product design.

[0068] Please refer to Figures 5 to 7 , Figure 6 is Figure 3 the exploded view of the end cap assembly 100 from the first perspective in Figure 7 is Figure 3 the exploded view of the end cap assembly 100 from the second perspective in. In this embodiment, the stop portion 14 is spaced from the outer shell 110, which facilitates assembly. The stop portion 14 has a stop surface 144 spaced from the hem 34. Specifically, in this embodiment, the flange 140 includes an inner peripheral surface 1402 and an outer peripheral surface 1403 arranged opposite to each other. The stop surface 144 is configured as the inner peripheral surface 1402 of the flange 140. The stop portion 14 is configured as the entire flange 140.

[0069] In this embodiment, the outer peripheral surface 1403 of the stop portion 14 is spaced from the connecting surface 1101 of the housing 110, thereby further avoiding the problem that the folded edge 34 presses and folds the outer wall, resulting in an unreliable connection between the cover member 10 and the housing 110 at the welded seal. Optionally, the sharp corners of the cover body 12 are rounded, thereby avoiding the problem of scraping between the cover member 10 and the housing 110 to generate debris, and improving safety and assembly efficiency.

[0070] Exemplarily, in this embodiment, the outer peripheral surface 1403 of the flange 140 is spaced from the outer peripheral surface 1202 of the cover body 12, that is, the folded edge 34 is spaced from the housing 110, thereby avoiding contact between the flange 140 and the housing 110, and further reducing the risk of short circuit caused by friction between the housing 110 and the cover member 10 to generate fine debris. A first chamfer structure 145 is provided on the side of the cover body 12 facing away from the folded edge 34, thereby enabling the cover member 10 to be quickly installed in the housing 110 of the energy storage device 1000, improving assembly efficiency and processing rate, and reducing the risk of scraping between the cover body 12 and the housing 110, and improving the safety of the energy storage device 1000.

[0071] In some embodiments, the outer peripheral surface 1403 of the flange 140 is coplanar with the outer peripheral surface 1202 of the cover body 12. Along the radial direction Y of the end cover assembly 100, a first chamfer structure 145 is provided on the side of the stop portion 14 facing away from the folded edge 34, thereby enabling the cover member 10 to be quickly installed in the housing 110 of the energy storage device 1000, improving assembly efficiency and processing rate, and reducing the friction area between the flange 140 and the housing 110, and further reducing the risk of short circuit caused by friction between the housing 110 and the cover member 10 to generate fine debris.

[0072] In some embodiments, rounded corners are formed at the sharp corners of the folded edge 34 and / or the stop portion 14, thereby avoiding the problem of scraping of the folded edge 34 and / or the stop portion 14 to generate debris. Specifically, at least one sharp corner of the folded edge 34 has a rounded corner, and / or at least one sharp corner of the stop portion 14 has a rounded corner. In some embodiments, rounded corners may also be provided at the abutting portion of the folded edge 34 and the stop portion 14. By providing rounded corners, the periphery of the folded edge 34 and / or the stop portion 14 is a smooth structure, avoiding the sharp corner structure from scraping the cover member 10 to generate metal debris, and the debris entering the battery cell will cause a short circuit problem, improving the use safety of the energy storage device 1000.

[0073] Optionally, in this embodiment, the current collector component 30 includes a plurality of flanges 34. The plurality of flanges 34 are arranged on the current collector disk body 32 at intervals along the circumferential direction of the current collector disk body 32, thereby saving costs and ensuring the structural strength of the four peripheral edges of the current collector component 30. Any two adjacent flanges 34 are arranged at intervals, thereby facilitating the processing and forming of the flanges 34. In some embodiments, the current collector component 30 includes a single flange 34, and the flange 34 is configured as an annular structure, thereby facilitating the processing technology of the flange 34.

[0074] The first height L11 of the flange 34 is 4.5 mm - 7.5 mm. Along the radial direction Y of the end cap assembly 100, L12 of the flange 34 is the first thickness L12, and the first thickness L12 is 0.5 mm - 2 mm. In the circumferential direction Z of the end cap assembly 100, the dimension of the flange 34 is the first length L13, and the first length L13 is 1.5 mm - 3.5 mm, thereby facilitating the processing and forming of the flange 34, ensuring the connection strength between the flange 34 and the current collector disk body 32, and achieving the enhancement of the structural strength of the four peripheral edges of the current collector component 30. For example, the first height L11 of the flange 34 can be 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, etc., the first thickness L12 of the flange 34 can be 0.5 mm, 1.0 mm, 2 mm, etc., and the first length L13 of the flange 34 can be 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, or 3.5 mm, etc. It should be noted that the first height L11, the first thickness L12, and the first length L13 of the flange 34 are only for illustration and do not constitute specific limitations. The first height L11, the first thickness L12, and the first length L13 of the flange 34 need to be designed according to the actual product design.

[0075] The second height L21 of the stop portion 14 is 0.2 mm - 3 mm. Along the radial direction Y of the end cap assembly 100, the dimension of the stop portion 14 is the second thickness L22, and the second thickness L22 is 0.2 mm - 2 mm, which facilitates the processing and forming of the stop portion 14 and ensures the connection strength between the stop portion 14 and the cover body 12, so that the stop area between the stop portion 14 and the flanging 34 is large enough, and further enables the stop portion 14 to better limit the flanging 34 from being pressed and folded towards the housing 110. For example, the second height L21 of the stop portion 14 can be 0.2 mm, 0.5 mm, 1.0 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc., and the second thickness L22 of the stop portion 14 can be 0.2 mm, 0.5 mm, 1.0 mm, 1.5 mm, 2 mm, etc. In the circumferential direction Z of the end cap assembly 100, the dimension of the stop portion 14 is the second length L23. It should be noted that the second height L21 and the second thickness L22 of the stop portion 14 are only for illustration and do not constitute specific limitations. The second height L21 and the second thickness L22 of the stop portion 14 need to be designed according to the actual product design. Optionally, the second length L23 of the stop portion 14 is greater than the first length L13 of the flanging 34, so as to ensure the structural strength of the stop portion 14 and increase the stop area of the stop portion 14.

[0076] Optionally, in some embodiments, the second thickness L22 of the stop portion 14 is greater than or equal to the first thickness L12 of the flanging 34, so as to ensure the structural strength of the stop portion 14, and further prevent the flanging 34 from pressing and folding the stop portion 14, and ensure the reliability of the welding yield at the welded seal.

[0077] In some embodiments, a bending groove 3204 is formed on the edge of the current collector disk body 32. Each flanging 34 is provided with a bending groove 3204 on both sides in the circumferential direction of the end cap assembly 100, so as to avoid cracks between the flanging 34 and the current collector disk body 32 during the forming process of the flanging 34, and further improve the connection strength between the flanging 34 and the current collector disk body 32. The current collector disk body 32 further includes a second disk surface 3202 opposite to the first disk surface 3201. It can be understood that the bending groove 3204 penetrates through the first disk surface 3201 and the second disk surface 3202 of the current collector disk body 32, so the bending groove 3204 can play a role in ventilation and liquid leakage.

[0078] It can be understood that a welding groove 3205 is provided on the first disk surface 3201 of the current collector disk body 32, and a welding protrusion 321 is formed on the second disk surface 3202 of the current collector disk body 32 at a position corresponding to the welding groove 3205. The welding groove 3205 or the welding protrusion 321 can play a role in positioning the current collector component 30 when welding the current collector component 30, thereby facilitating the welding of the current collector component 30 and the electrode assembly 120. The number of welding grooves 3205 corresponds to the number of welding protrusions 321 one by one. Exemplarily, in this embodiment, the number of welding grooves 3205 includes a plurality. The plurality of welding grooves 3205 are arranged radially around the center of the end cover assembly 100, and any two adjacent welding grooves 3205 are spaced apart. Thereby, the positioning accuracy of the current collector component 30 can be improved, and the welding quality can be ensured. Exemplarily, in this embodiment, the number of welding grooves 3205 includes three. In some other embodiments, the number of welding grooves 3205 can also be one, two, or more than three, and the present application does not make specific limitations.

[0079] It can be understood that an electrochemical reaction can occur between the current collector component 30 and the electrolyte, and the chemical energy is converted into electrical energy, so that the energy storage device 1000 can output electrical energy to the outside. However, when the energy storage device 1000 is charged and discharged cyclically or stored for a long time, the electrolyte in the housing 110 will gradually decompose and generate gas. The current collector disk body 32 is provided with a plurality of vent holes 3206 in a region outside the welding groove 3205. It should be noted that the vent holes 3206 can also be used to discharge the gas generated by the energy storage device 1000 to the explosion-proof valve 50, thereby ensuring the safety of the energy storage device 1000. It can be understood that during the transportation of the energy storage device 1000, the electrolyte will overflow between the guide cover component 10 and the current collector component 30, so the vent holes 3206 can also play a role in distributing the electrolyte flowing into the space between the cover component 10 and the current collector component 30.

[0080] The stop portion 14, the cover body 12, the folded edge 34 and the current collector disk body 32 are integrally formed, thereby improving the structural strength, and there is no need to provide other connection structures, which can save components, reduce costs, and facilitate management and assembly.

[0081] In this embodiment, the extending direction of the hem 34 forms an angle with the extending direction of the current collecting disk body 32, and the angle is a right angle, thereby ensuring the structural strength of the four peripheral edges of the current collecting component 30, while being able to avoid the hem 34 from pressing and folding the outer shell 110, and further ensuring the welding yield of the welded seal. In some embodiments, the angle can also be an acute angle, for example, the angle is 30 - 80 degrees. On the one hand, it ensures the structural strength of the four peripheral edges of the current collecting component 30. On the other hand, it can further avoid the hem 34 from pressing and folding the outer shell 110, and can also reduce the risk of the hem 34 rubbing against the cover component 10, thereby ensuring the welding yield of the welded seal and improving safety. On the third hand, it avoids interference between the hem 34 of the current collecting component 30 and the cover component 10, and improves the assembly efficiency between the cover component 10 and the current collecting component 30.

[0082] In this embodiment, the current collecting disk body 32 includes an edge surface 3203 away from the boss 36. The distance between the edge surface 3203 of the current collecting disk body 32 and the boss 36 is equal to the distance between the hem 34 and the boss 36, thereby ensuring the structural strength of the four peripheral edges of the current collecting disk body 32, avoiding the risk of collision between the current collecting disk body 32 and the cover component 10 due to irregular outer walls in a narrow and crowded space, or avoiding difficult installation due to irregular outer walls, and further providing the assembly efficiency and simplifying the processing technology of the current collecting component 30. In some embodiments, the distance between the edge surface 3203 of the current collecting disk body 32 and the boss 36 is greater than the distance between the hem 34 and the boss 36, thereby ensuring the structural strength of the four peripheral edges of the current collecting disk body 32, and further avoiding the hem 34 from pressing and folding the outer shell 110, and ensuring the welding yield of the welded seal.

[0083] In some embodiments, the cover body 12 is welded to the boss 36. Specifically, the boss 36 includes a supporting boss 361 and a connecting boss 362. The supporting boss 361 is located between the connecting boss 362 and the current collecting disk body 32. The cover body 12 is provided with a through hole 101 that is in interference fit with the connecting boss 362. The supporting boss 361 abuts against the through hole 101, thereby simplifying the structure of the current collecting component 30, improving the stability and reliability of the connection between the cover component 10 and the current collecting component 30, and ensuring a space is formed between the cover component 10 and the current collecting component 30 to absorb the expansion of the battery cells of the electrode assembly 120 of the energy storage device 1000.

[0084] The end cover assembly 100 further includes an explosion-proof valve 50 disposed on the cover member 10. Specifically, the cover member 10 is provided with an installation hole 102 for installing the explosion-proof valve 50. When the energy storage device 1000 is improperly charged, accidentally short-circuited, or damaged externally, the temperature of the energy storage device 1000 will rise sharply and a large amount of gas will be generated. When the internal pressure of the energy storage device 1000 is greater than a certain value, the explosion-proof valve 50 will be pushed open by the gas, causing the internal pressure of the energy storage device 1000 to drop, thereby ensuring the safety of the energy storage device 1000. Optionally, the explosion-proof valve 50 is disposed at a position corresponding to the welding groove 3205 of the cover member 10, so as to prevent the electrolyte in the energy storage device 1000 from flushing the explosion-proof valve 50 and accidentally triggering the opening of the explosion-proof valve 50, and improving the safety of the energy storage device 1000.

[0085] Please also refer to Figure 2 、 Figures 8 to 10 , Figure 8 is Figure 2 a schematic structural view of a second embodiment of the end cover assembly 200 of the energy storage device 1000 in Figure 10 is Figure 8 a partial sectional view of the end cover assembly 100 in

[0086] Specifically, in this embodiment, the stop groove 150 is configured as an annular groove, and the annular groove is opened at the circumferential edge portion of the surface 1201 of the cover body 12, so as to facilitate the processing and forming of the annular groove, facilitate the assembly of the cover member 10 and the current collector member 30, and increase the stop range between the folded edge 34 of the current collector member 30 and the stop portion 14.

[0087] The groove width W of the stop groove 150 is greater than the first thickness L12 of the folded edge 34, thereby avoiding interference between the current collector component 30 and the cover component 10 during the assembly process, and thus improving the assembly efficiency of the current collector component 30 and the cover component 10. The groove width W of the stop groove 150 is 0.3 mm - 3.5 mm. The depth H of the stop groove 150 is 1.0 mm - 4.0 mm. For example, the depth H of the stop groove 150 can be 1 mm, 1.2 mm, 1.8 mm, 2 mm, 2.5 mm, 3.0 mm, 3.5 mm or 4.0 mm, etc. It should be noted that the groove width W and the depth H of the stop groove 150 are only for illustration and do not constitute specific limitations. The groove width W and the depth H of the stop groove 150 need to be designed according to the actual product design.

[0088] The stop groove 150 includes an inner groove wall 141 and an outer groove wall 142 arranged oppositely and a groove bottom wall 143 connecting the inner groove wall 141 and the outer groove wall 142. The stop surface 144 of the stop portion 14 is configured as the outer groove wall 142 of the stop groove 150. In this embodiment, when the energy storage device 1000 is overcharged, thermally out of control or mechanically vibrated, after the folded edge 34 is deformed and expanded, the folded edge 34 abuts against the outer groove wall 142 of the stop groove 150, thereby preventing the folded edge 34 from affecting the welded seal between the cover component 10 and the outer shell 110 and improving the use safety of the energy storage device 1000. In this embodiment, the height of the outer groove wall 142 of the stop groove 150 is greater than the height of the inner groove wall 141, thereby increasing the abutting area between the folded edge 34 and the outer groove wall 142 of the stop groove 150 and ensuring the welding yield of the welded seal between the outer shell 110 and the cover component 10. In some embodiments, the height of the outer groove wall 142 of the stop groove 150 can also be equal to the height of the inner groove wall 141. The folded edge 34 is spaced from the groove bottom wall 143 of the stop groove 150, thereby preventing the folded edge 34 from rubbing against the cover body 12 to generate debris and preventing interference between the folded edge 34 and the cover component 10 during the assembly process, and thus improving the assembly efficiency and the safety performance of the energy storage device 1000.

[0089] Specifically, the stop groove 150 divides the cover body 12 to form a first convex portion 121 and a second convex portion 146. Along the radial direction Y of the end cover assembly 200, the folded edge 34 is located between the first convex portion 121 and the second convex portion 146, and is spaced apart from the first convex portion 121 and the second convex portion 146. The second convex portion 146 is located outside the first convex portion 121. An end portion on the side of the second convex portion 146 facing away from the first convex portion 121 is provided with a first chamfer structure 145, so that the cover member 10 can be quickly installed in the housing of the energy storage device, improving the assembly efficiency and the processing rate, reducing the risk of scratching between the cover body 12 and the housing, and enhancing the safety of the energy storage device. The second convex portion 146 can be used to stop against the folded edge 34, so as to prevent the folded edge 34 from being pressed and folded towards the housing 110 when the energy storage device 1000 is overcharged, in thermal runaway or mechanically vibrated, thereby ensuring the reliability of the welded seal between the cover member 10 and the housing 110 and improving the use safety of the energy storage device 1000. The second convex portion 146 is in a ring structure to ensure effective stopping against the folded edge 34.

[0090] Please refer to Figure 2 and Figure 10 , Figure 10 is Figure 2 a schematic structural view of a third embodiment of the end cover assembly 300 of the energy storage device 1000 in . In the third embodiment, the structure of the end cover assembly 300 is similar to the structure of the end cover assembly 200 in the second embodiment. Specifically, reference can be made to the introduction of the end cover assembly 200 in the second embodiment, which will not be elaborated here. The difference is that the stop groove 160 is arranged around the explosion-proof valve 50, thereby simplifying the overall structure of the cover member 10.

[0091] Optionally, in some embodiments, the stop groove 160 is configured as a welding mark groove for the explosion-proof valve 50. Specifically, a stop groove 160 is formed in a side portion of the edge of the surface 1201 of the cover body 12 close to the current collector member. The folded edge can extend into the stop groove 160 at the outer periphery of the explosion-proof valve 50. When the energy storage device 1000 is in thermal runaway, overcharged or mechanically vibrated, the folded edge abuts against the outer groove wall of the stop groove 160, preventing the outward flanging from affecting the welded seal between the cover member 10 and the housing 110, thereby ensuring the welding yield at the welded seal between the housing 110 and the cover member 10; at the same time, preventing interference between the folded edge of the positive current collector member and the cover member 10 during the assembly process.

[0092] The stop groove 160 includes an inner groove wall 161 and an outer groove wall 162 which are oppositely arranged, and a groove bottom wall 163 connecting the inner groove wall 161 and the outer groove wall 162. The outer groove wall 162 of the stop groove 160 includes a first wall 1621 relatively close to the hem and a second wall 1622 connected to the first wall 1621 and relatively far from the hem. The stop surface 144 of the stop portion 14 is configured as the first wall 1621 of the stop groove 150. In this embodiment, when the energy storage device 1000 is overcharged, thermally out of control or mechanically vibrated, after the hem deforms and expands, the hem abuts against the first wall 1621 of the stop groove 160, thereby preventing the hem from affecting the welded seal between the cover member 10 and the housing 110, and improving the use safety of the energy storage device 1000.

[0093] Specifically, the first wall 1621 of the stop groove 160 is close to the circumferential edge of the cover body 12 and serves as the stop surface 144. A first convex portion 121 is formed on the cover body 12 corresponding to the second wall 1622.

[0094] In some embodiments, in the axial direction X of the end cover assembly 300, the size of the hem extending into the stop groove 160 is greater than the size of the hem located outside the stop groove 160, thereby preventing the hem of the positive current collector component from interfering with the cover member 10. In some other embodiments, other limiting grooves may be provided in the area of the cover body 12 outside the welding mark groove. The limiting grooves are used to receive the hem, so as to ensure that the hem located at the peripheral edge of the current collector component can abut against the groove wall of the limiting groove. The depth of the limiting groove may be equal to the depth of the stop groove 160, so that the axial length of the hem can be set to be the same, simplifying the processing technology of the current collector component.

[0095] Please refer to Figure 2 、 Figure 9 and Figure 11 , Figure 11 is Figure 1 a partial sectional view of the fourth embodiment of the end cover assembly 400 of the energy storage device 1000 in

[0096] In this embodiment, the insulating member 40 is received in the limiting space 16. Specifically, the stop portion 14 is configured as a stop groove 150, and the insulating member 40 is located in the stop groove 150. Along the radial direction Y of the energy storage device 1000, the insulating member 40 is located between the folded edge 34 and the stop surface 144, that is, the insulating member 40 is located between the folded edge 34 and the second convex portion 146, so as to prevent the folded edge 34 from directly contacting the stop portion 14 and causing scraping and generating debris, thereby avoiding the problem of short circuit. In addition, the structure of the insulating member 40 is simple, which is convenient for processing and forming and reduces the usage amount, saving the production cost.

[0097] Exemplarily, in this embodiment, the insulating member 40 is fixed to the stop surface 144 by an adhesive method. In some embodiments, the insulating member 40 and the stop surface 144 can also be fixed by, but not limited to, a snap-fit method. The material of the insulating member 40 includes, but is not limited to, one or a combination of polypropylene (PP), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), polyimide (PI), polystyrene (PS), cast polypropylene (CPP), polyethylene naphthalate two formic acid glycol ester (PEN), polyvinyl chloride (PVC), poly(ether-ether-ketone) (PEEK), polyethersulfone resin (PES), polyphenylene sulfone resin (PPSM), polyethylene (PE). In some embodiments, the insulating member 40 is a PET film. The PET film is a plastic film with gloss, excellent physical properties, high rigidity, strength and ductility, puncture resistance, abrasion resistance, heat and cold resistance, and excellent chemical resistance, abrasion resistance, sealing and aroma retention. Of course, the insulating member 40 can also be replaced with other materials such as PPS, PE, PVC, etc. according to actual needs.

[0098] In some embodiments, along the radial direction Y of the end cap assembly 400, a first chamfer structure 145 is provided on the side of the stop portion 14 facing away from the folded edge 34, so that the cover member 10 can be quickly installed in the outer shell 110 of the energy storage device, improving the assembly efficiency and the processing rate, reducing the scraping risk between the cover member 10 and the outer shell 110, and improving the safety of the energy storage device.

[0099] Please refer to Figure 2 、 Figure 11 and Figure 12 , Figure 12 is Figure 1 a partial sectional view of the fifth embodiment of the end cover assembly 500 of the energy storage device 1000 in . In the fifth embodiment, the structure of the end cover assembly 400 is similar to that of the end cover assembly 400 in the fourth embodiment. For specific details, reference can be made to the description of the end cover assembly 400 in the fourth embodiment, which will not be elaborated here. The difference is that the insulating member 40 includes a separating portion 41 located within the limiting space 16 and a bending portion 42 located outside the limiting space 16. Along the radial direction Y of the end cover assembly 400, a welding portion 18 protrudes from the outer periphery of the cover body 12. One end of the bending portion 42 is connected to the separating portion 41, and the other end extends towards the welding portion 18. The bending portion 42 is located between the welding portion 18 and the folded edge 34, thereby increasing the contact area between the insulating member 40 and the stopping portion 14, further improving the connection strength between the insulating member 40 and the stopping portion 14, and further preventing the stopping portion 14 from directly contacting the outer shell 110 and causing abrasion and generating debris, thereby avoiding the problem of short circuit.

[0100] Specifically, in this embodiment, the insulating member 40 is sleeved outside the second convex portion 146 to cover the second convex portion 146, thereby preventing the cover body 12 from directly contacting the outer shell 110 and the folded edge 34 from directly contacting the stopping surface 144 and causing abrasion and generating debris, thereby avoiding the problem of short circuit.

[0101] Along the radial direction Y of the end cover assembly 400, a first chamfer structure 145 is provided on the side of the stopping portion 14 facing away from the folded edge 34. The bending portion 42 extends from the separating portion 41 towards the first chamfer structure 145 and covers the first chamfer structure 145, further increasing the contact area between the insulating member 40 and the stopping portion 14, providing the connection strength between the insulating member 40 and the stopping portion 14, and facilitating the installation of the insulating member 40.

[0102] Optionally, in some embodiments, a second chamfer structure 43 corresponding to the first chamfer structure 145 in the axial direction of the end cover assembly 400 is provided on the side of the insulating member 40 facing away from the stopping portion 14. On the one hand, due to the arrangement of the first chamfer structure 145 and the second chamfer structure 43, the cover component can be quickly installed within the outer shell 110 of the energy storage device, improving the assembly efficiency and the processing rate of the manufacturing process. On the other hand, the bending portion 42 extends from the separating portion 41 towards the first chamfer structure 145, preventing the outer shell 110 from rubbing against the cover component 10 and generating fine debris, thereby avoiding the problem of short circuit.

[0103] Specifically, along the axial direction X of the end cap assembly 500, the longitudinal cross-sectional shape of the stop portion 14 is trapezoidal. The longitudinal cross-sectional shape of the insulating member 40 is U-shaped. The outer shape of the insulating member 40 is matched with the outer shape of the stop portion 14 to enable the insulating member 40 to be sleeved outside the stop portion 14. The insulating member 40 is configured as an elastic structure, so that the insulating member 40 can absorb the deformation of the flanging 34 when the flanging 34 deforms, further preventing the flanging 34 from being folded towards the housing 110. The insulating member 40 can also be clamped to the stop portion 14 through frictional force, facilitating the disassembly and assembly of the insulating member 40 and improving the assembly efficiency.

[0104] In some embodiments, a receiving groove 402 is formed at one end of the bending portion 42 close to the welding portion 18, and the opening direction of the receiving groove 402 faces the cover body 12. On the one hand, when the cover component and the current collecting component are sealed and welded, since the welding temperature is higher than the melting point of the insulating member 40, the bending portion 42 of the insulating member 40 can be melted at a position close to the welding portion 18 to form the receiving groove 402 for collecting welding chips, thereby improving the safety of the energy storage device 1000. On the other hand, the insulating member 40 is melted by the welding temperature to form the receiving groove 402, thus simplifying the processing technology of the receiving groove 402 of the insulating member 40 and improving the production efficiency. In other embodiments, the receiving groove 402 can also be formed on the insulating member 40 by other means, and the present application does not make specific limitations.

[0105] It should be noted that the structure of the insulating member 40 in the fourth and fifth embodiments is applicable to the end cap assembly 100 in the first embodiment and the end cap assembly 200 in the second embodiment, and the present application does not make specific limitations.

[0106] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An end cap assembly (100, 200, 300, 400, 500), characterized in that, Comprising: A cover member (10), the cover member (10) includes a cover body (12) and a stop portion (14) provided at an edge portion of the cover body (12), and the stop portion (14) and the cover body (12) form a limit space (16); A current collecting member (30), the current collecting member (30) includes a current collecting disk body (32) and at least one flanging (34) provided at an edge portion of the current collecting disk body (32); The current collecting disk body (32) is convexly provided with a boss (36) for supporting the cover body (12), the cover body (12) and the current collecting disk body (32) are arranged at an interval, the flanging (34) extends from the current collecting disk body (32) towards the cover member (10) and extends into the limit space (16), the flanging (34) and the stop portion (14) are arranged at an interval and are arranged at an interval from the cover body (12).

2. The end cap assembly (100, 200, 300, 400, 500) according to claim 1, characterized in that, In the axial direction (X) of the end cover assembly (100, 200, 300, 400, 500), the distance between the cover body (12) and the flanging (34) is a first distance (D1), and the first distance (D1) is 0.01 mm - 0.31 mm.

3. The end cap assembly (100, 200, 300, 400, 500) according to claim 1, characterized in that, In the axial direction (X) of the end cover assembly (100, 200, 300, 400, 500), the depth of the flanging (34) extending into the limit space (16) is a second distance (D2), and the second distance (D2) is 0.5 mm - 2.54 mm.

4. The end cap assembly (100, 200, 300, 400, 500) according to claim 1, characterized in that Along the radial direction (Y) of the end cover assembly (100, 200, 300, 400, 500), the distance between the stop portion (14) and the flanging (34) is a third distance (D3), and the third distance (D3) is 0.15 mm - 0.5 mm.

5. The end cap assembly (100, 200, 300, 400, 500) according to claim 1, characterized in that, The stop portion (14) has a stop surface (144) arranged at an interval from the flanging (34), and the end cover assembly (100, 200, 300, 400, 500) further includes an insulating member (40), and the insulating member (40) is located between the flanging (34) and the stop surface (144).

6. The end cap assembly (100, 200, 300, 400, 500) according to claim 5, characterized in that, The insulating member (40) is accommodated in the limit space (16).

7. The end cap assembly (100, 200, 300, 400, 500) according to claim 5, characterized in that, The insulating member (40) includes a separating portion (41) located in the limit space (16) and a bent portion (42) located outside the limit space (16). Along the radial direction (Y) of the end cover assembly (100, 200, 300, 400, 500), a welding portion (18) is convexly provided on the outer periphery of the cover body (12), one end of the bent portion (42) is connected to the separating portion (41), and the other end extends towards the welding portion (18), and the bent portion (42) is located between the welding portion (18) and the flanging (34).

8. The end cap assembly (100, 200, 300, 400, 500) according to claim 7, characterized in that, In the radial direction (Y) of the end cover assemblies (100, 200, 300, 400, 500), a first chamfer structure (145) is provided on the side of the stop portion (14) facing away from the flanging (34). In the radial direction (Y) of the end cover assemblies (100, 200, 300, 400, 500), the bent portion (42) extends to the first chamfer structure (145).

9. The end cap assembly (100, 200, 300, 400, 500) according to claim 8, characterized in that, On the side of the insulating member (40) facing away from the stop portion (14), a second chamfer structure (43) corresponding to the first chamfer structure (145) in the axial direction of the end cover assemblies (100, 200, 300, 400, 500) is provided.

10. The end cap assembly (100, 200, 300, 400, 500) according to claim 7, characterized in that, One end of the bent portion (42) close to the welding portion (18) is provided with a receiving groove (402), and the opening direction of the receiving groove (402) faces the cover body (12).

11. The end cap assembly (100, 200, 300, 400, 500) according to any one of claims 5-10, characterized in that, The stop portion (14) is configured as a flange (140) provided on the surface (1201) of the cover body (12) close to the current collecting member (30), and the stop surface (144) is configured as the inner circumferential surface (1402) of the flange (140) facing the flanging (34).

12. The end cap assembly (100, 200, 300, 400, 500) according to any one of claims 5-10, characterized in that, The stop portion (14) is configured as a stop groove (150, 160). The stop grooves (150, 160) are provided on the surface (1201) of the cover body (12) close to the current collecting member (30). The flanging (34) extends into the stop grooves (150, 160), and the internal space of the stop grooves (150, 160) is the limiting space (16). The stop surface (144) is configured as the outer groove wall (142) of the stop grooves (150, 160) facing the flanging (34).

13. The end cap assembly (100, 200, 300, 400, 500) according to claim 12, wherein, The stop groove (150) is configured as an annular groove, and the annular groove is provided at the circumferential edge portion of the surface (1201) of the cover body (12) facing the current collecting member (30).

14. The end cap assembly (100, 200, 300, 400, 500) according to claim 12, characterized in that, The end cover assemblies (100, 200, 300, 400, 500) further include an explosion-proof valve provided on the cover member (10), and the stop groove (160) is arranged around the explosion-proof valve (50).

15. The end cap assembly (100, 200, 300, 400, 500) according to any one of claims 5-10, characterized in that, Round corners are formed at the edge sharp corners of the flanging (34) and / or the stop portion (14).

16. The end cap assembly (100, 200, 300, 400, 500) according to any one of claims 5-10, characterized in that, The current collecting member (30) includes a plurality of the flangings (34), and the plurality of the flangings (34) are arranged at intervals in the circumferential direction of the current collecting disc body (32) on the current collecting disc body (32).

17. The end cap assembly (100, 200, 300, 400, 500) according to any one of claims 5-10, characterized in that, The extending direction of the flanging (34) forms an angle with the extending direction of the current collecting disc body (32), and the angle is a right angle or an acute angle.

18. An energy storage device, characterized in that, It includes a housing, an electrode assembly (120) and the end cover assemblies (100, 200, 300, 400, 500) according to any one of claims 1-17; the end cover assemblies (100, 200, 300, 400, 500) are hermetically and fixedly connected to the housing (110) to form a receiving cavity (130), and the electrode assembly (120) is received in the receiving cavity (130).

19. An electrical device, characterized in that, Comprising an energy storage device (1000) as described in claim 18, the energy storage device (1000) providing electrical energy to the electrical equipment.

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