End cover assembly, energy storage device and electrical equipment

Abstract

The present invention provides an end cover assembly, an energy storage device, and an electrical equipment. The end cover assembly includes a current collector and a first insulating member formed with a receiving groove. The current collector includes a disk portion and a handle portion. The disk portion has a welding area for welding the tab of the energy storage device, and the welding area is recessed on the first surface of the disk portion facing the first insulating member. The handle portion has a first connection portion, a second connection portion, and a transition portion connected between the first connection portion and the second connection portion. The first connection portion connects the disk portion, and the second connection portion is disposed in the receiving groove. Wherein, the disk portion includes a first region located between two adjacent welding areas and close to the first connection portion. A first protrusion is provided on the second surface of the first region facing away from the first insulating member, and the first protrusion is used to abut against the tab. This end cover assembly can effectively ensure that the current collector and the tab have a large contact area, thereby ensuring sufficient electrical connection between the current collector and the tab.

Description

Technical Field

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

[0002] A secondary battery, also known as a rechargeable battery or a storage battery, refers to a battery in which the active substances can be activated by charging after the battery discharges and can be used continuously. The recyclable characteristic of the secondary battery has gradually made it the main power source of electrical equipment. With the increasing demand for secondary batteries, people have higher and higher requirements for various performances of them, especially for the battery cycle performance and safety performance.

[0003] Existing secondary batteries, such as cylindrical lithium-ion batteries, are composed of an end cover assembly, an electrode assembly, and a cylindrical housing. The actual production process of the secondary battery is to first separately manufacture the end cover assembly, the electrode assembly, and the cylindrical housing; then use a metal adapter to weld the pole column of the end cover assembly and the tab of the electrode assembly respectively to realize the conduction from the tab to the pole column; then place the electrode assembly into the cylindrical housing, and bend the metal adapter to align the end cover assembly and the cylindrical housing concentrically; after the end cover assembly covers the opening of the cylindrical housing, it is welded and sealed with the opening of the cylindrical housing to form the basic structure of the secondary battery. Among them, the quality of the electrical conductivity between the metal adapter and the tab is a key factor affecting the battery cycle performance and safety performance.

[0004] However, at present, in order to pursue the high energy density of secondary batteries, the wound electrode assembly is made as large as possible, resulting in the inability of the metal adapter to conduct electricity fully with the tab, leading to poor electrical conductivity of the tab, large internal resistance and high heat generation efficiency of the secondary battery, seriously affecting the safety performance of the battery and reducing the battery service life. Summary of the Invention

[0005] The present invention aims to solve at least one technical problem in the prior art. To this end, the present invention provides an end cover assembly, an energy storage device, and an electrical equipment. The current collector in the end cover assembly includes a disc portion provided with a welding area and a first protrusion. By welding with the tab through the welding area and abutting against the tab through the first protrusion, it can effectively ensure that there is a large contact area between the current collector and the tab, thereby ensuring the full electrical connection between the current collector and the tab, helping to improve the reliability of the electrical energy transmission of the battery cell, and effectively enhancing the safety performance of the battery cell.

[0006] To achieve the above object, in a first aspect, the present invention provides an end cover assembly applied to an energy storage device, where the energy storage device includes a tab, and the end cover assembly includes:

[0007] A first insulating member formed with a receiving groove;

[0008] Current collector, including a disk body part and a handle body part; the disk body part has a welding area, the welding area is recessed on the first surface of the disk body part facing the first insulating part, and the welding area is used for welding the tab; the handle body part has a first connection part, a second connection part and a transition part connected between the first connection part and the second connection part, the first connection part connects the disk body part, and the second connection part is arranged in the accommodation groove;

[0009] Wherein, the disk body part includes a first area located between two adjacent welding areas and close to the first connection part, and a first protrusion is provided on the second surface of the first area facing away from the first insulating part, and the first protrusion is used for abutting against the tab.

[0010] In one embodiment, the first protrusion includes at least one first boss, and the first boss extends in a straight line or in a curve.

[0011] In one embodiment, when the current collector is in a flattened state, the connection line direction of the first connection part and the second connection part is defined as the first direction; when the first boss extends in a straight line, the first boss extends along the radial direction of the disk body part, or along the first direction, or along a second direction perpendicular to the first direction.

[0012] In one embodiment, the welding area forms a protrusion on the second surface of the disk body part facing away from the first insulating part, and the height of the first protrusion is greater than the height of the protrusion.

[0013] In one embodiment, when the current collector is in a flattened state, the handle body part is in a sheet structure, and the first connection part and the second connection part are opposite ends of the handle body part in the length direction;

[0014] The welding area includes a first welding groove and a second welding groove, the first welding groove and the second welding groove are located on opposite sides of the central position of the disk body part, the first welding groove includes two first welding sub-grooves arranged at an angle, the second welding groove includes two second welding sub-grooves arranged at an angle, the included angle openings of the two first welding sub-grooves are opposite to the included angle openings of the two second welding sub-grooves, and the first area is located between the adjacent first welding sub-groove and the second welding sub-groove close to the first connection part.

[0015] In one embodiment, a second protrusion is further provided on the second surface of the disk body part facing away from the first insulating part, and the second protrusion is used for abutting against the tab;

[0016] Wherein, the second protrusion is arranged in other areas of the second surface except the areas corresponding to the first area and the welding area.

[0017] In one embodiment, the disc body portion further includes a second region at an included angle opening of the two first welding sub-grooves, and a third region at an included angle opening of the two second welding sub-grooves, and the second raised portion is provided on a second surface of the second region and / or the third region facing away from the first insulating member.

[0018] In one embodiment, the height of the second raised portion is less than the height of the first raised portion.

[0019] In one embodiment, the welding area forms a protrusion on a second surface of the disc body portion facing away from the first insulating member, and the height of the second raised portion is equal to the height of the protrusion.

[0020] In one embodiment, the second raised portion includes at least one second boss, and the second boss extends linearly or along a curve.

[0021] In one embodiment, when the current collector is in a flattened state, a connection line direction between the first connection portion and the second connection portion is defined as a first direction;

[0022] When the second boss extends linearly, the second boss extends along a radial direction of the disc body portion, or along the first direction, or along a second direction perpendicular to the first direction.

[0023] In one embodiment, the welding area forms a protrusion on a second surface of the disc body portion facing away from the first insulating member, and chamfers are provided at corners of at least one of the first raised portion, the second raised portion, and the protrusion.

[0024] In one embodiment, the transition portion includes a first bending area, a second bending area, and a connecting section connecting between the first bending area and the second bending area. The first bending area is located in a region of the transition portion close to the first connection portion, the second bending area is located in a region of the transition portion close to the second connection portion, and the first raised portion is adjacent to the first bending area; the current collector is arc-shaped in the first bending area and the second bending area respectively.

[0025] In a second aspect, the present invention provides an energy storage device, including an electrode assembly and an end cap assembly as described in any one of the above embodiments. The electrode assembly includes a tab, and the end cap assembly further includes a terminal post. The terminal post is inserted through the first insulating member and connected to the second connection portion, and the tab is welded to the welding area and abuts against the first raised portion.

[0026] In a third aspect, the present invention provides an electrical equipment, including the energy storage device as described above.

[0027] Compared with the prior art, the present invention has the following beneficial effects: the end cover assembly provided by the present invention includes a first insulating member and a current collecting member, the current collecting member includes a disk body portion and a handle body portion connected to each other, the handle body portion is used to connect the pole, the disk body portion is provided with a welding area and a first protrusion portion, the welding area is used to weld the pole ear, and the first protrusion portion is used to abut against the pole ear, which can effectively ensure that the current collecting member and the pole ear have a larger contact area, which helps to improve the reliability of power transmission of the battery cell, and when the disk body portion is bent relative to the handle body portion and is forced to warp toward the first insulating member, the first protrusion portion can also always ensure that the pole ear is effectively electrically connected to the disk body portion, ensure the conductive performance of the pole ear, and reduce the internal resistance of the battery cell, especially when the pole ear is an inverted pole ear, the first protrusion portion can effectively press the pole ear of the outer ring to avoid the warping of the pole ear and short-circuiting with the inner wall of the shell of the battery cell, thereby effectively improving the safety performance of the battery cell.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a diagram of an application scenario of the energy storage device provided in an embodiment of the present invention in user-side energy storage.

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of an end cover assembly provided by one embodiment of the present invention when the current collecting member is in a flattened state.

[0032] Figure 3 yes Figure 2 A schematic plan view of the end cap assembly shown from another perspective.

[0033] Figure 4 yes Figure 2 A schematic diagram of the three-dimensional exploded structure of the end cover assembly shown.

[0034] Figure 5 yes Figure 4 The three-dimensional structural schematic diagram of the end cover assembly shown in another viewing angle.

[0035] Figure 6 yes Figure 2The sectional view taken along the A-A direction as shown.

[0036] Figure 7 is Figure 2 The schematic three-dimensional structure diagram of the end cover assembly shown when the current collector is in the folded state.

[0037] Figure 8 is Figure 7 The schematic three-dimensional structure diagram of the end cover assembly shown from another perspective.

[0038] Figure 9 is Figure 7 The side view of the end cover assembly shown after removing the first insulating part.

[0039] Figure 10 is Figure 7 The sectional view taken along the B-B direction as shown.

[0040] Figure 11 is Figure 7 The sectional view taken along the C-C direction as shown.

[0041] Explanation of reference numerals:

[0042] 100 - energy storage device; 200 - electric energy conversion device; 300 - first user load; 400 - second user load; 1 - end cover assembly;

[0043] 11 - cover plate; 111 - first assembly hole; 112 - pressure relief hole; 1121 - first sink; 1122 - second sink; 113 - first positioning groove; 114 - positioning hole; 12 - first insulating part; 121 - body part; 1211 - anti-fooling rib; 122 - second assembly hole; 123 - hollow structure; 124 - positioning post; 125 - rib part; 126 - accommodating groove; 13 - pole; 131 - column part; 132 - flange part; 133 - assembly part; 14 - current collector; 141 - disc part; 1411 - welding area; 1412 - first area; 1413 - second area; 1414 - third area; 1415 - fourth area; 142 - handle part; 1421 - first connecting part; 1422 - second connecting part; 1423 - transition part; 1424 - first bending area; 1425 - second bending area; 1426 - first reinforcing rib; 1427 - second reinforcing rib; 1428 - anti-fooling notch; 143 - first protruding part; 144 - second protruding part; 145 - first through hole; 146 - second through hole; 15 - explosion-proof valve; 16 - explosion-proof valve protection piece; 17 - sealing ring; 18 - second insulating part; 181 - first positioning block; 182 - second positioning groove; 19 - riveting press block. Detailed implementation manners

[0044] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0045] To facilitate the understanding of the energy storage device provided by the embodiments of the present invention, some common knowledge in the field of energy storage will be described as follows first.

[0046] 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 electric energy is to develop green energy such as photovoltaic and wind power to replace fossil energy. Currently, the generation of green electric energy 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 there is too much electricity during low electricity consumption. The unstable voltage will also damage the power. Therefore, the problem of "abandoning wind and light" may be caused due to insufficient electricity demand or insufficient grid acceptance capacity. 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 charger". When photovoltaic and wind energy are sufficient, the electric energy is stored, and the stored electric energy is released when needed.

[0047] Taking electrochemical energy storage as an example, the embodiments of the present invention provide an energy storage device. A chemical battery is provided inside the energy storage device, which 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.

[0048] Currently, the application scenarios of energy storage (i.e., energy storage) are relatively wide, including power generation side energy storage, grid side energy storage, renewable energy grid connection energy storage, and user side energy storage, etc. The types of corresponding energy storage devices include:

[0049] (1) A large energy storage container applied to the grid side energy storage scenario, which can be used as a high-quality active and reactive power regulation power source in the grid, realize the load matching of electric energy in time and space, enhance the consumption capacity of renewable energy, and is of great significance in the grid system standby, alleviating the power supply pressure of peak loads, and peak shaving and frequency modulation;

[0050] (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 cabinet / box during the low electricity price period; during the peak electricity price period, they release the electricity stored in the energy storage device 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.

[0051] Please refer to Figure 1 , in the embodiments of the present invention, taking the household energy storage scenario in user-side energy storage as an example, the energy storage device 100 provided by the embodiments of the present invention will be described. Of course, the energy storage device 100 provided by the embodiments of the present invention is not limited to the household energy storage scenario.

[0052] As Figure 1 shown, the embodiments of the present invention provide a household energy storage system. The household energy storage system includes an electric energy conversion device 200 (photovoltaic panel), a first user load 300 (street lamp), a second user load 400 (such as household appliances like air conditioners), etc., and an energy storage device 100. The energy storage device 100 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 100 is used to store the electric energy and supply it to the street lamp and household appliances for use during the peak electricity price period, or supply power when the power grid is powered off / out of power.

[0053] It can be understood that in the embodiments of the present invention, the energy storage device 100 may include but is not limited to battery cells, battery modules, battery packs, battery systems, etc. Among them, the battery cells included in the energy storage device 100 can be cylindrical batteries. It should be noted that the battery cell includes a housing, an electrode assembly accommodated in the housing, and an end cap encapsulated at the opening of the housing. The end cap can adopt the end cap assembly 1 provided by the embodiments of the present invention.

[0054] Please combine with Figures 2 to 11 , the embodiments of the present invention provide an end cap assembly 1, which is applied to battery cells (not limited to lithium-ion secondary batteries). Among them, the end cap assembly 1 can be used as the positive end cap of the battery cell or the negative end cap of the battery cell, and this is not limited.

[0055] Specifically, as Figures 2 to 6As shown, in an embodiment of the present invention, the end cap assembly 1 includes a cover plate 11, a first insulating member 12, a pole column 13, and a current collector 14. The cover plate 11 is provided with a first assembly hole 111 penetrating through its opposite sides in the thickness direction; the first insulating member 12 includes a body portion 121 provided on one side of the cover plate 11 in the thickness direction. The body portion 121 is provided with a second assembly hole 122 penetrating through its opposite sides in the thickness direction, and the second assembly hole 122 is correspondingly communicated with the first assembly hole 111. In addition, as Figure 3 shown, a receiving groove 126 is formed on the side of the body portion 121 facing away from the cover plate 11; the pole column 13 is inserted into the communicated second assembly hole 122 and the first assembly hole 111 from the side of the body portion 121 facing away from the cover plate 11, that is, the pole column 13 is inserted into the cover plate 11 and the first insulating member 12, and one end of the pole column 13 away from the body portion 121 is fixed relative to the cover plate 11, and one end of the pole column 13 away from the cover plate 11 protrudes from the side of the body portion 121 facing away from the cover plate 11; the current collector 14 is provided on the side of the body portion 121 away from the cover plate 11 and is connected to one end of the pole column 13 away from the cover plate 11.

[0056] Among them, as Figures 2 to 5 shown, in an embodiment of the present invention, the current collector 14 includes a disk body portion 141 and a handle body portion 142. The disk body portion 141 is used for welding the tab (not shown in the figure) of the electrode assembly of the battery cell where the end cap assembly 1 is located, and the handle body portion 142 is connected to the pole column 13 to realize the electrical energy transmission of the electrode assembly. Specifically, the disk body portion 141 has a welding area 1411, and the welding area 1411 is recessed on the first surface of the disk body portion 141 facing the first insulating member 12, and the welding area 1411 is used for welding the tab; the handle body portion 142 has a first connection portion 1421, a second connection portion 1422, and a transition portion 1423 located between the first connection portion 1421 and the second connection portion 1422. The first connection portion 1421 is connected to the disk body portion 141, the second connection portion 1422 is disposed in the receiving groove 126 of the first insulating member 12, and the second connection portion 1422 is used for connecting one end of the pole column 13 away from the cover plate 11.

[0057] Specifically, when the end cap assembly 1 is applied to a battery cell, the current collector 14 is in a folded state. As Figures 7 to 11As shown, in an embodiment of the present invention, when the current collecting piece 14 is in a folded state, the current collecting piece 14 is bent at the transition portion 1423, so that there is a relative bend between the disk body portion 141 and the handle body portion 142 of the current collecting piece 14, thereby aligning the cover plate 11, the first insulating piece 12, the disk body portion 141 and the electrode assembly of the battery cell, and the disk body portion 141 is welded to the pole ear of the electrode assembly, and the cover plate 11 is sealed and welded to the shell of the battery cell.

[0058] It is important to note that if Figure 2 , Figure 3 and Figure 8 As shown, in an embodiment of the present invention, the disk body portion 141 includes a first area 1412 located between two adjacent welding areas 1411 and close to the first connecting portion 1421, and the first area 1412 is provided with a first protrusion 143 on the second surface facing away from the first insulating member 12, and the first protrusion 143 is used to abut against the pole ear when the welding area 1411 is welded to the pole ear. As such, in the end cover assembly 1 provided in the embodiment of the present invention, the current collector 14 is welded to the pole ear through the welding area 1411, and is abutted against the pole ear through the first protrusion 143, which can effectively ensure that the current collector 14 has a larger contact area with the pole ear, which helps to improve the reliability of power transmission of the battery cell, and when the disk body 141 is bent relative to the handle body 142 and is forced to warp toward the first insulating member 12, the first protrusion 143 can also always ensure that the pole ear is effectively electrically connected to the disk body 141, ensure the conductivity of the pole ear, and reduce the internal resistance of the battery cell. In particular, when the pole ear is an inverted pole ear, the first protrusion 143 can effectively press the outer ring of the pole ear to avoid the warping of the pole ear and the short circuit with the inner wall of the shell of the battery cell, thereby effectively improving the safety performance of the battery cell.

[0059] It should also be noted that, in an embodiment of the present invention, the end cover assembly 1 also includes other components such as an explosion-proof valve 15, an explosion-proof valve protection sheet 16, a sealing ring 17, a second insulating member 18 and a riveted pressure block 19; the end cover assembly 1 can be used in a cylindrical battery, and the cover plate 11 is correspondingly a disc-shaped cover plate; the end cover assembly 1 can also be applied to a square battery, and the cover plate 11 is correspondingly a rectangular plate-shaped cover plate.

[0060] The following takes the application of the end cover assembly 1 in a cylindrical battery as an example to describe in detail the structure and function of the end cover assembly 1 provided in the embodiment of the present invention.

[0061] Please combine Figure 4 , Figure 5 as well as Figure 10, in one embodiment of the present invention, the cover plate 11 of the disc structure is provided with a first assembly hole 111 for mounting the pole column 13 in the middle region, and a pressure relief hole 112 penetrating through the opposite sides of the cover plate 11 in the thickness direction is provided in the region near the edge. An explosion-proof valve 15 is provided on the side of the cover plate 11 facing the first insulating member 12, and the explosion-proof valve 15 covers the end hole of the pressure relief hole 112 near the first insulating member 12 for effective explosion when the battery cell of the end cover assembly 1 is thermally out of control, so as to prevent the battery cell from exploding. Preferably, in this embodiment, a first sink 1121 is provided on the side of the cover plate 11 facing the first insulating member 12 at a position adjacent to the edge of the pressure relief hole 112. The explosion-proof valve 15 is received and installed in the first sink 1121 and welded to the cover plate 11. The first insulating member 12 is located on the side of the explosion-proof valve 15 away from the pressure relief hole 112. Among them, it should be noted that a hollow structure 123 is provided at the position of the first insulating member 12 corresponding to the explosion-proof valve 15. The hollow structure 123 is used for gas to pass through and accumulate under the explosion-proof valve 15 when the battery cell is thermally out of control. When the air pressure of the accumulated gas reaches a preset air pressure value, the explosion-proof valve 15 can have an effective explosion. In this embodiment, by receiving and installing the explosion-proof valve 15 in the first sink 1121, the overall thickness and volume of the cover plate 11 and the explosion-proof valve 15 can be reduced. Moreover, the first insulating member 12 provided with the hollow structure 123 is arranged on the surface of the explosion-proof valve 15 away from the pressure relief hole 112, which can not only prevent the explosion-proof valve 15 from being scratched and damaged, but also prevent the electrolyte from directly impacting the explosion-proof valve 15 and avoid mis-triggering of the explosion-proof valve 15. In other embodiments, the explosion-proof valve 15 can also be directly welded and fixed to the side of the cover plate 11 facing the first insulating member 12, and a first sink 1121 for receiving the explosion-proof valve 15 is provided on the side of the first insulating member 12 facing the cover plate 11, which is not limited herein.

[0062] Further, in Figure 4 , Figure 5 and Figure 10In the example, an explosion-proof valve protection piece 16 is provided on the side of the cover plate 11 facing away from the first insulating member 12. The explosion-proof valve protection piece 16 covers the orifice of the pressure relief hole 112 away from the first insulating member 12, and the explosion-proof valve protection piece 16 is used to protect the side of the explosion-proof valve 15 facing away from the first insulating member 12. Preferably, in this embodiment, on the side of the cover plate 11 facing away from the first insulating member 12, a second sink 1122 is provided at the edge part adjacent to the orifice of the pressure relief hole 112 away from the first insulating member 12, and the explosion-proof valve protection piece 16 is received and installed in the second sink 1122. By receiving and installing the explosion-proof valve protection piece 16 in the second sink 1122, the thickness and volume of the end cover assembly 1 will not be increased, which helps to improve the energy density per unit volume of the battery cell applying the end cover assembly 1. Moreover, the explosion-proof valve protection piece 16 can also protect the surface of the explosion-proof valve 15 facing away from the first insulating member 12, so that both opposite sides of the explosion-proof valve 15 are protected, improving the safety of the explosion-proof valve 15. In other embodiments, the explosion-proof valve protection piece 16 can also be directly fixed to the side of the cover plate 11 facing away from the first insulating member 12, and this is not limited. It should be noted that there is a ventilation hole between the explosion-proof valve protection piece 16 and the edge of the pressure relief hole 112, and there is enough clearance between the explosion-proof valve protection piece 16 and the explosion-proof valve 15 to ensure that the explosion-proof valve 15 can explode normally. Among them, the explosion-proof valve 15 and the explosion-proof valve protection piece 16 can both adopt existing explosion-proof valves and protection pieces, and this will not be elaborated here.

[0063] Please refer to again Figure 4 、 Figure 5 and Figure 10 , in one embodiment of the present invention, the cover plate 11 is further provided with a first positioning groove 113 and at least one positioning hole 114. The first positioning groove 113 is opened on the side of the cover plate 11 facing away from the first insulating member 12 and surrounds and communicates with the first assembly hole 111. The positioning hole 114 is opened on the side of the cover plate 11 facing away from the first insulating member 12. The first positioning groove 113 is used for positioning and installing the second insulating member 18, and the positioning hole 114 is used for positioning and installing the first insulating member 12. There will be a detailed description later, so it will not be elaborated here.

[0064] Optionally, in the embodiment of the present invention, the cover plate 11 can be a conductive metal plate, and the conductive metal plate can be but not limited to a copper plate, an aluminum plate, a copper alloy plate or an aluminum alloy plate. Generally, when the end cover assembly 1 is used as the positive end cover of the battery cell, the cover plate 11 can be an aluminum plate; when the end cover assembly 1 is used as the negative end cover of the battery cell, the cover plate 11 can be a copper plate.

[0065] Please combine Figures 2 to 5 In one embodiment of the present invention, the main body 121 is a disc structure whose contour matches the contour of the cover plate 11. The middle area of the main body 121 is provided with the second assembly hole 122 corresponding to the first assembly hole 111 for passing the pole 13. The area near the edge of the main body 121 is provided with the hollow structure 123 corresponding to the explosion-proof valve 15, and the hollow structure 123 is used for gas to pass through to ensure that the explosion-proof valve 15 can be normally exploded, wherein the hollow structure 123 is composed of at least one of a hollow groove and a hollow hole, as long as it can allow gas to pass through, and this is not limited. Further, in this embodiment, at least one positioning column 124 is convexly provided on the side of the main body 121 facing the cover plate 11, and the positioning column 124 corresponds to the positioning hole 114 on the cover plate 11 one by one, and the main body 121 is installed on one side of the cover plate 11 through the cooperation of the positioning column 124 and the positioning hole 114. In other embodiments, the main body 121 may be provided with a positioning hole, and the cover plate 11 may be provided with a positioning post corresponding thereto, so that the main body 121 may be installed on one side of the cover plate 11 through the cooperation between the positioning hole and the positioning post. Of course, in other embodiments, the main body 121 may also be installed on one side of the cover plate 11 through the cooperation of other positioning structures (not limited to the cooperation between the card slot and the card block), which is not limited thereto.

[0066] Please also read Figure 3 and Figure 5 In one embodiment of the present invention, the first insulating member 12 further includes two ribs 125 disposed on opposite sides of the main body 121 in the radial direction, and the two ribs 125 are used to enhance the structural strength of the main body 121. Figure 3 and Figure 5 As shown, the pair of ribs 125 and the main body 121 define a receiving groove 126 for arranging the second connecting portion 1422 of the handle body 142, and the receiving groove 126 has a first opening facing away from the main body 121, and two second openings connected to the first opening and arranged relatively spaced apart in the radial direction of the main body 121, the spacing direction of the two second openings being perpendicular to the spacing direction of the two ribs 125, and the hollow structure 123 is arranged in a region of the main body 121 adjacent to one of the second openings. It should be noted that in the embodiment of the present invention, Figure 8As shown, when the current collector 14 is in the folded state, in the disk portion 141 that is aligned with the cover plate 11 and the first insulating member 12, at least a part of the region (specifically, the second region 1413 and the third region 1414 described later) is located on the side of the two rib portions 125 away from the body portion 121. Thus, when the disk portion 141 is subjected to a squeezing force (such as the squeezing force of the electrode assembly of the battery cell) towards the body portion 121, the two rib portions 125 can also abut against the disk portion 141, thereby preventing the disk portion 141 from being excessively deformed and contributing to improving the structural stability of the end cap assembly 1.

[0067] Optionally, in Figure 3 and Figure 5 example, each of the rib portions 125 includes an arc-shaped rib protruding from the side of the body portion 121 facing away from the cover plate 11 and extending a certain distance along the circumferential edge of the body portion 121, a first linear rib located on the side of the arc-shaped rib close to the second fitting hole 122, and a plurality of second linear ribs connected between the arc-shaped rib and the first linear rib. The extending direction of the first linear rib is perpendicular to the extending direction of the second linear rib. In other embodiments, the rib portion 125 may also be composed of multiple ribs in other forms, and this is not limited herein.

[0068] Please refer back to Figures 2 to 5 In one embodiment of the present invention, the disk portion 141 is a disk structure with a contour adapted to the contour of the cover plate 11, the handle portion 142 is a sheet-like structure, and the first connecting portion 1421 and the second connecting portion 1422 of the handle portion 142 are the opposite ends of the handle portion 142 in the length direction. As Figure 2 and Figure 4 shown, the first connecting portion 1421 is laminated on the side of the disk portion 141 facing the cover plate 11 (i.e., the side facing away from the tab when welding to the tab), and is welded to the disk portion 141. In other embodiments, the first connecting portion 1421 may also be directly welded to the outer peripheral wall of the disk portion 141, or the disk portion 141 and the handle portion 142 are integrally formed. As Figure 3 and Figure 5 shown, the second connecting portion 1422 is received in the receiving groove 126 between the two rib portions 125 of the first insulating member 12, and the second connecting portion 1422 is provided with a through hole (not labeled in the figure) corresponding to the second fitting hole 122. The pole column 13 is inserted through the communicating through hole, second fitting hole 122, and first fitting hole 111, and is welded to the second connecting portion 1422. Specifically, please refer to Figure 4 and Figure 6, the terminal post 13 includes a columnar portion 131, a flange portion 132 connected to one end of the columnar portion 131, and an assembly portion 133 protruding from a side of the flange portion 132 facing the columnar portion 131 and surrounding the columnar portion 131. One end of the columnar portion 131 away from the flange portion 132 sequentially passes through the through hole, the second assembly hole 122, and the first assembly hole 111 that are communicated, until the flange portion 132 abuts against a side of the second connection portion 1422 facing away from the cover plate 11. A portion of the columnar portion 131 close to the flange portion 132 is inserted into the second assembly hole 122 and the first assembly hole 111 that are communicated. The assembly portion 133 is received and installed in the through hole. The flange portion 132 is used for welding the second connection portion 1422.

[0069] As Figures 2 to 5 shown, in one embodiment of the present invention, the welding area 1411 includes a first welding groove (not labeled in the figure) and a second welding groove (not labeled in the figure) in a V shape. The first welding groove and the second welding groove are located on opposite sides of the center position of the disk portion 141, that is, on opposite sides of the center line in the width direction of the handle portion 142. The first welding groove includes two first welding sub-grooves arranged at an angle. The second welding groove includes two second welding sub-grooves arranged at an angle. The included angle openings of the two first welding sub-grooves face away from the included angle openings of the two second welding sub-grooves. It should be noted that in this embodiment, the welding area 1411 (i.e., the first welding groove and the second welding groove) is recessed on the side of the disk portion 141 facing the cover plate 11 (i.e., the side facing away from the ear when welding with the ear), and a protrusion is formed on the side of the disk portion 141 facing away from the cover plate 11 (i.e., the side facing the ear). Among them, as Figures 2 to 5 shown, a first region 1412 as described above is defined on the side facing the ear between one end of the first welding groove close to the handle portion 142 and one end of the second welding groove close to the handle portion 142, that is, the first region 1412 is located between the adjacent first welding sub-groove and the second welding sub-groove close to the first connection portion 1421. A first protrusion 143 for abutting against the ear is provided in the first region 1412. The first connection portion 1421 is laminated on the region of the disk portion 141 facing the cover plate 11 corresponding to the first region 1412, and the first connection portion 1421 is welded to the disk portion 141.

[0070] Optionally, in an embodiment of the present invention, the first convex portion 143 includes at least one first boss, and the first boss may extend linearly, for example, extend along the radial direction of the disk body portion 141, or extend along the first direction, or extend along the second direction, and the first boss may also extend along a curve. Wherein, the first direction is the direction of the line connecting the first connecting portion 1421 and the second connecting portion 1422 when the current collector 14 is in a flattened state, and the second direction is perpendicular to the first direction. Preferably, in Figures 2 to 5 In an example, the first convex portion 143 includes a plurality of first bosses extending along the radial direction of the disk body portion 141. By setting the first bosses to extend along the radial direction of the disk body portion 141, not only can the contact area between the first convex portion 143 and the tab be increased, but also the bending resistance of the disk body portion 141 in the radial direction can be enhanced, so that warping can be reduced or even avoided when the disk body portion 141 is bent relative to the handle body portion 142, thereby further improving the electrical connection reliability between the disk body portion 141 and the tab. Among them, the first boss is preferably integrally formed with the disk body portion 141 for easy processing.

[0071] Optionally, in an embodiment of the present invention, the first convex portion 143 forms a convex on the surface of the disk body portion 141 facing away from the cover plate 11, but a groove may or may not be formed on the surface of the disk body portion 141 facing the cover plate 11. Preferably, in Figures 2 to 5 In an example, the first convex portion 143 forms a groove on the surface of the disk body portion 141 facing the cover plate 11, which is beneficial to reducing the material consumption of the first convex portion 143 and lowering the cost. It should be noted that when the first convex portion 143 forms a groove on the surface of the disk body portion 141 facing the cover plate 11, preferably, the projections of the first convex portion 143 and the first connecting portion 1421 in the first region 1412 do not overlap each other. In this way, the surface of the disk body portion 141 facing the cover plate 11 for laminating the first connecting portion 1421 is a flat surface, which is beneficial to improving the welding reliability between the disk body portion 141 and the first connecting portion 1421.

[0072] Preferably, in Figures 2 to 5In the example, the protrusion formed by the welding area 1411 on the surface of the disk portion 141 facing the tab (i.e., the second surface of the welding area 1411 facing away from the first insulating member 12) has a height of the first protrusion portion 143 greater than that of the protrusion. By setting the height of the protrusion of the first protrusion portion 143 to be greater than the height of the protrusion of the welding area 1411, it can effectively ensure that when the disk portion 141 warps towards the first insulating member 12, the current collector 14 can still be in effective electrical contact connection with the tab through the first protrusion portion 143, and can further enhance the pressing effect on the outer-ring tabs, preventing the tabs from contacting and short-circuiting with the housing of the battery cell.

[0073] Please refer back to Figures 2 to 5 In the embodiment of the present invention, a second protrusion portion 144 is further provided on the second surface of the disk portion 141 facing away from the first insulating member 12, and the second protrusion portion 144 is used to abut against the tab. Among them, the second protrusion portion 144 is provided in other areas of the second surface except for the areas corresponding to the first area 1412 and the welding area 1411. It is not difficult to understand that by providing the second protrusion portion 144 for abutting against the tab in other areas of the second surface, the contact area between the current collector 14 and the tab can be further increased, thereby enhancing the conductive performance between the current collector 14 and the tab and improving the reliability of the electric energy transmission of the battery cell.

[0074] Specifically, in Figures 2 to 5 the example, the surface of the disk portion 141 facing the tab further includes a second area 1413 located at the included angle opening of the two first welding sub-grooves of the first welding groove, and a third area 1414 located at the included angle opening of the two second welding sub-grooves of the second welding groove. The second area 1413 and the third area 1414 are respectively located on opposite sides in the radial direction of the disk portion 141. Optionally, in one embodiment of the present invention, the second protrusion portion 144 is provided in the second area 1413 and / or the third area 1414, and the second protrusion portion 144 is used to abut against the tab when the welding area 1411 is welded to the tab. In Figures 2 to 5 the example, it is preferred that the second protrusion portion 144 is provided in both the second area 1413 and the third area 1414.

[0075] It can be understood that since both the second region 1413 and the third region 1414 are farther from the handle body portion 142 than the first region 1412, when the disc body portion 141 is bent relative to the handle body portion 142 and warps toward the first insulating member 12 under force, the warpage degrees of the second region 1413 and the third region 1414 are smaller than the warpage degree of the first region 1412. Preferably, in Figures 2 to 5 In the example of, the height of the second protrusion 144 is less than the height of the first protrusion 143, and the height of the second protrusion 144 is equal to or approximately equal to the height of the protrusion formed by the welding region 1411 on the surface of the disc body portion 141 facing away from the tab (i.e., the second surface facing away from the first insulating member 12). Thus, on the basis of ensuring effective electrical connection contact between the second protrusion 144 and the tab, the second protrusion 144 does not need to be made too high, which can reduce the material consumption of the second protrusion 144 and lower the cost.

[0076] Among them, similar to the first protrusion 143, in the embodiments of the present invention, the second protrusion 144 includes at least one second boss, and the second boss can extend in a straight line, such as extending along the radial direction of the disc body portion 141, or extending along the aforementioned first direction, or extending along a second direction perpendicular to the first direction, and the second boss can also extend in a curve. In Figures 2 to 5 In the example of, the second protrusion 144 includes a plurality of second bosses extending along the first direction, and the plurality of second bosses are preferably integrally formed with the disc body portion 141, which is convenient for processing. In addition, in the embodiments of the present invention, the second protrusion 144 forms a protrusion on the surface of the disc body portion 141 facing away from the cover plate 11, but a groove may or may not be formed on the surface of the disc body portion 141 facing the cover plate 11. Preferably, in Figures 2 to 5 In the example of, the second protrusion 144 forms a groove on the surface of the disc body portion 141 facing the cover plate 11, which is beneficial to further reduce the material consumption of the second protrusion 144 and lower the cost.

[0077] It should be noted that in Figures 2 to 5 In the example of, since the welding region 1411 adjacent to the second boss is welded to the tab, reliable contact between the disc body portion 141 and the tab can be achieved, and the warpage degrees of the second region 1413 and the third region 1414 where the second boss is provided are smaller than the warpage degree of the first region 1412. Therefore, the second boss can be made into a boss (which can also be called a rib) with a smaller width and smaller area than the first boss, which also helps to save materials and reduce the manufacturing difficulty.

[0078] Further, in Figures 2 to 5 In the example of Figures 2 to 5 , at least one of the first protrusion 143, the second protrusion 144, and the protrusion formed by the welding area 1411 on the side of the disk portion 141 facing the tab has a chamfer (bevel or fillet) at the corner, and preferably, the first protrusion 143, the second protrusion 144, and the corners of the protrusion are all provided with fillets. By providing chamfers at the corners of all the protrusions on the side of the disk portion 141 facing the tab, it is possible to prevent the tab from being scratched and damaged when the corners are sharp right angles.

[0079] Please refer to again Figure 3 , in one embodiment of the present invention, a first through hole 145 and a plurality of second through holes 146 are further provided on the disk portion 141. Among them, the first through hole 145 is provided between the first welding groove and the second welding groove, and the plurality of second through holes 146 are provided in a fourth area 1415 on the side of the welding area 1411 away from the handle portion 142. The fourth area 1415 is the area between the first welding sub-groove of the first welding groove away from the handle portion 142 and the second welding sub-groove of the second welding groove away from the handle portion 142, that is, the area corresponding to the explosion-proof valve 15. Both the first through hole 145 and the plurality of second through holes 146 can allow gas to pass through.

[0080] Please refer to again in combination with Figures 7 to 11 , as described above, when the current collector 14 is in the folded state, the current collector 14 bends in the bending area of the handle portion 142. Specifically, in Figures 7 to 11 In the example of Figures 7 to 11 , the transition portion 1423 includes a first bending area 1424, a second bending area 1425, and a connecting section (not labeled in the figure) connecting the first bending area 1424 and the second bending area 1425. The first bending area 1424 is located in the area of the transition portion 1423 close to the first connecting portion 1421, the second bending area 1425 is located in the area of the transition portion 1423 close to the second connecting portion 1422, and the first protrusion 143 is adjacent to the first bending area 1424. In Figures 7 to 11 In the example of Figures 7 to 11 , when the current collector 14 is in the folded state, the current collector 14 bends (see Figure 9 and Figure 10 ) into an arc shape at the first bending area 1424 and the second bending area 1425 respectively, and the cross-section along the thickness direction of the current collector 14 is in an S shape.

[0081] In other embodiments, the transition portion 1423 may only include a first bending area 1424 near the first connecting portion 1421, and the first protruding portion 143 is adjacent to the first bending area 1424; when the current collector 14 is in a folded state, the current collector 14 is bent into an arc shape at the first bending area 1424, and the cross-section along the thickness direction of the current collector 14 is U-shaped.

[0082] It can be understood that in the above two embodiments, the second connecting portion 1422 of the handle body portion 142 is fixed relative to the cover plate 11. After the current collector 14 is only bent at the first bending area 1424, the opposite two side surfaces of the disk body portion 141 can be considered to have been turned over once relative to the cover plate 11, and the disk body portion 141 needs to face the electrode assembly of the battery cell so that the disk body portion 141 is welded to the ear of the electrode assembly, and the first protruding portion 143 and the second protruding portion 144 in the first area 1412 are in contact with the ear. Therefore, when the current collector 14 is in a flattened state, the first area 1412 provided with the first protruding portion 143 and the second protruding portion 144 should face the cover plate 11, that is, face away from the ear. The difference is that in Figures 7 to 11 In the example of, after the current collector 14 is bent at the first bending area 1424 and the second bending area 1425, the opposite two side surfaces of the disk body portion 141 can be considered to have not been flipped relative to the cover plate 11. Therefore, when the current collector 14 is in a flattened state, the first area 1412 provided with the first protruding portion 143 and the second protruding portion 144 can directly face away from the cover plate 11, that is, directly face the ear.

[0083] Preferably, please refer to Figure 3 and Figure 5 , in the embodiments of the present invention, a first anti-fooling structure is provided in the accommodation groove 126 of the first insulating member 12, and the handle body portion 142 correspondingly is provided with a second anti-fooling structure. Through the cooperation of the first anti-fooling structure and the second anti-fooling structure, it is ensured that the handle body portion 142 of the current collector 14 in the flattened state is received and installed in the accommodation groove 126, and the disk body portion 141 of the current collector 14 faces the cover plate 11 correctly. Specifically, in Figure 3 and Figure 5In the example, the first anti-fooling structure is the anti-fooling rib 1211 provided in the accommodating groove 126, and the second anti-fooling structure is the anti-fooling notch 1428 provided in the second connecting portion 1422 of the handle body portion 142. The anti-fooling notch 1428 abuts against the anti-fooling rib 1211, indicating that the orientation of the disc body portion 141 relative to the cover plate 11 is correct. Of course, in other embodiments, the first anti-fooling structure and the second anti-fooling structure can also be other types of structural combinations, such as the cooperation of an anti-fooling post and an anti-fooling hole, as long as it can ensure that the orientation of the disc body portion 141 relative to the cover plate 11 is correct, and this is not limited thereto.

[0084] Preferably, as Figure 4 shown, in one embodiment of the present invention, notches are provided at opposite ends of the first bending region 1424 and the second bending region 1425 in the width direction of the handle body portion 142 to facilitate the bending of the first bending region 1424 and the second bending region 1425.

[0085] Optionally, as Figure 4 shown, in one embodiment of the present invention, reinforcing ribs can be provided on at least one side of the transition portion 1423 of the handle body portion 142 in the thickness direction to enhance the structural strength of the transition portion 1423. Specifically, in Figure 4 the example, a plurality of first reinforcing ribs 1426 are provided at a position near the first bending region 1424 on the side of the transition portion 1423 facing the cover plate 11, and a plurality of second reinforcing ribs 1427 are provided at a position near the second bending region 1425 on the side of the transition portion 1423 facing away from the cover plate 11. The plurality of first reinforcing ribs 1426 and the plurality of second reinforcing ribs 1427 both extend a certain distance along the length direction of the handle body portion 142 and are spaced apart in a colloidal manner along the width direction of the handle body portion 142, so that the structural strength of the transition portion 1423 can be significantly enhanced.

[0086] It should be noted that in the embodiments of the present invention, when the end cap assembly 1 serves as the positive end cap of the battery cell, the current collector 14 can be made of the same aluminum material as the cover plate 11; when the end cap assembly 1 serves as the negative end cap of the battery cell, the current collector 14 can be made of the same copper material as the cover plate 11.

[0087] Please refer back to Figures 4 to 6 , in the embodiments of the present invention, the end of the pole 13 far from the body portion 121 is fixed relative to the cover plate 11. Specifically, in Figures 4 to 6In the example, the end cap assembly 1 further includes a second insulating member 18, a riveting press block 19, and a sealing ring 17. Among them, the sealing ring 17 is sleeved on the outer wall of the column body portion 131 of the pole column 13 for filling between the outer wall of the column body portion 131 and the inner walls of the first assembly hole 111 and the second assembly hole 122, thereby improving the sealing performance between the pole column 13 and the cover plate 11 and the first insulating member 12; both the second insulating member 18 and the riveting press block 19 are provided with through holes for the end of the column body portion 131 away from the flange portion 132 to pass through. The second insulating member 18 is sleeved on the outer wall of the column body portion 131 to achieve insulation between the cover plate 11 and the pole column 13. The riveting press block 19 is arranged in the second positioning groove 182 of the second insulating member 18, and the riveting press block 19 is used for welding the end of the column body portion 131.

[0088] Among them, as Figures 4 to 6 shown, in one embodiment of the present invention, a first positioning block 181 corresponding to the first positioning groove 113 on the cover plate 11 protrudes from the side of the second insulating member 18 facing the cover plate 11, and a flange protrudes from the side of the first positioning block 181 facing the flange portion 132. The second insulating member 18 can be quickly positioned and installed on the cover plate 11 through the cooperation between the first positioning block 181 and the first positioning groove 113, and the flange fills between the inner wall of the first assembly hole 111 and the outer wall of the column body portion 131, thereby achieving insulation between the cover plate 11 and the pole column 13. In other embodiments, a first positioning groove may be opened on the side of the second insulating member 18 facing the cover plate 11, and the cover plate 11 is correspondingly provided with a first positioning block, and the second insulating member 18 can also be quickly positioned and installed on the cover plate 11.

[0089] Furthermore, as Figures 4 to 6 shown, in one embodiment of the present invention, a second positioning groove 182 is opened on the side of the second insulating member 18 facing away from the cover plate 11. The outer contour of the riveting press block 19 is adapted to the groove contour of the second positioning groove 182. The riveting press block 19 can be quickly positioned and installed in the second positioning groove 182, and it helps to reduce the thickness and volume of the end cap assembly 1. In other embodiments, a second positioning block may be opened on the side of the second insulating member 18 facing away from the cover plate 11, and the riveting press block 19 is correspondingly provided with a second positioning groove, and the riveting press block 19 can also be quickly positioned and installed in the second insulating member 18.

[0090] It should be noted that, in the embodiment of the present invention, the groove body contour of the first positioning groove 113 is adapted to the outer contour of the first positioning block 181, and is not limited to a cross shape or a straight shape; similarly, the groove body contour of the second positioning groove 182 is adapted to the outer contour of the riveted pressing block 19, and is not limited to a cross shape or a straight shape. Among them, the second insulating member 18 and the aforementioned first insulating member 12 can be made of plastic, and the first insulating member 12, the second insulating member 18 and the riveted pressing block 19 can respectively adopt the existing plastic under the cover plate, plastic on the cover plate and riveted pressing block, which will not be described in detail.

[0091] In summary, in the end cap assembly 1 provided in the embodiment of the present invention, the disc portion 141 of the current collector 14 is provided with a welding area 1411 and a first protrusion 143 facing the pole ear is provided at least in the first area 1412 close to the first connecting portion 1421. The welding area 1411 is welded to the pole ear, and the first protrusion 143 is abutted against the pole ear, which can effectively ensure that the current collector 14 has a larger contact area with the pole ear, which helps to improve the reliability of the power transmission of the battery cell, and When the disk body 141 is bent relative to the handle body 142 and is forced to warp toward the first insulating member 12, the first protrusion 143 can also always ensure that the pole ear is effectively electrically connected to the disk body 141, thereby ensuring the conductivity of the pole ear and reducing the internal resistance of the battery cell. In particular, when the pole ear is an inverted pole ear, the first protrusion 143 can effectively press down the outer ring of the pole ear to prevent the pole ear from warping and short-circuiting with the inner wall of the battery cell shell, thereby effectively improving the safety performance of the battery cell.

[0092] Furthermore, an embodiment of the present invention further provides an energy storage device 100, and the energy storage device 100 includes at least one battery cell. The battery cell includes a shell, an electrode assembly contained in the shell, and an end cap encapsulated at the opening of the shell, and the end cap can be the end cap assembly 1 provided in the embodiment of the present invention. Since the end cap in the battery cell includes all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0093] It should be noted that, similar to existing battery cells, the battery cell also includes other components, such as an electrolyte contained in the shell for soaking the electrode assembly, which will not be elaborated on; the electrode assembly has a pole ear, and the electrode assembly can be an existing wound electrode assembly or a laminated electrode assembly, which is not limited.

[0094] Further, an embodiment of the present invention further provides an electrical device, which includes an electrical device body and the energy storage device 100 provided by the embodiment of the present invention. The energy storage device 100 is used to supply power to the electrical device body. Since the energy storage device 100 includes all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0095] Among them, the electrical device may be, but is not limited to, electronic devices such as mobile phones, tablet computers, laptop computers, desktop computers, smart bracelets, smart watches, e-readers, game consoles, toys, etc., and the aforementioned household energy storage systems, and there is no limitation thereto.

[0096] In the description of the present invention, the descriptions referring to terms such as "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0097] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An end cap assembly (1), applied to an energy storage device (100), the energy storage device (100) including a tab, characterized in that, The end cap assembly (1) includes: A first insulating member (12) formed with a receiving groove (126); A current collector member (14) including a disk portion (141) and a handle portion (142); the disk portion (141) has a welding area (1411), and the welding area (1411) is recessed on a first surface of the disk portion (141) facing the first insulating member (12), and the welding area (1411) is used for welding the tab; the handle portion (142) has a first connecting portion (1421), a second connecting portion (1422), and a transition portion (1423) connected between the first connecting portion (1421) and the second connecting portion (1422), the first connecting portion (1421) connects the disk portion (141), and the second connecting portion (1422) is disposed in the receiving groove (126); Wherein, the disk portion (141) includes a first region (1412) located between two adjacent welding areas (1411) and close to the first connecting portion (1421), and a first protrusion (143) is provided on a second surface of the first region (1412) facing away from the first insulating member (12), and the first protrusion (143) is used for abutting against the tab; the welding area (1411) forms a protrusion on a second surface of the disk portion (141) facing away from the first insulating member (12), and the height of the first protrusion (143) is greater than the height of the protrusion.

2. The end cap assembly (1) according to claim 1, characterized in that, The first protrusion (143) includes at least one first boss, and the first boss extends linearly or curvilinearly.

3. The end cap assembly (1) according to claim 2, characterized in that, When the current collector member (14) is in a flattened state, the connecting line direction between the first connecting portion (1421) and the second connecting portion (1422) is defined as a first direction; When the first boss extends linearly, the first boss extends along the radial direction of the disk portion (141), or along the first direction, or along a second direction perpendicular to the first direction.

4. The end cap assembly (1) according to claim 1, characterized in that, When the current collector member (14) is in a flattened state, the handle portion (142) is in a sheet-like structure, and the first connecting portion (1421) and the second connecting portion (1422) are opposite ends of the handle portion (142) in the length direction; The welding area (1411) includes a first welding groove and a second welding groove, the first welding groove and the second welding groove are located on opposite sides of the center position of the disk portion (141), the first welding groove includes two first welding sub-grooves arranged at an angle, the second welding groove includes two second welding sub-grooves arranged at an angle, the included angle openings of the two first welding sub-grooves are opposite to the included angle openings of the two second welding sub-grooves, and the first region (1412) is located between the adjacent first welding sub-groove and the second welding sub-groove close to the first connecting portion (1421).

5. The end cap assembly (1) according to claim 4, characterized in that, A second protrusion (144) is further provided on a second surface of the disk portion (141) facing away from the first insulating member (12), and the second protrusion (144) is used for abutting against the tab; Wherein, the second protruding portion (144) is disposed in a region of the second surface other than the regions corresponding to the first region (1412) and the welding region (1411).

6. The end cap assembly (1) according to claim 5, characterized in that, The disk portion (141) further includes a second region (1413) at an included angle opening of the two first welding sub-grooves, and a third region (1414) at an included angle opening of the two second welding sub-grooves. The second protruding portion (144) is provided on the second surface of the second region (1413) and / or the third region (1414) facing away from the first insulating member (12).

7. The end cap assembly (1) according to claim 5, characterized in that, The height of the second protruding portion (144) is less than the height of the first protruding portion (143).

8. The end cap assembly (1) according to claim 5, characterized in that, The welding region (1411) forms a protrusion on the second surface of the disk portion (141) facing away from the first insulating member (12), and the height of the second protruding portion (144) is equal to the height of the protrusion.

9. The end cap assembly (1) according to claim 5, characterized in that, The second protruding portion (144) includes at least one second boss, and the second boss extends along a straight line or along a curve.

10. The end cap assembly (1) according to claim 9, characterized in that, When the current collector (14) is in a flattened state, the connection line direction of the first connecting portion (1421) and the second connecting portion (1422) is defined as the first direction; When the second boss extends along a straight line, the second boss extends along the radial direction of the disk portion (141), or along the first direction, or along a second direction perpendicular to the first direction.

11. The end cap assembly (1) according to claim 5, characterized in that, The welding region (1411) forms a protrusion on the second surface of the disk portion (141) facing away from the first insulating member (12), and chamfers are provided at the corners of at least one of the first protruding portion (143), the second protruding portion (144), and the protrusion.

12. The end cap assembly (1) according to claim 1, characterized in that, The transition portion (1423) includes a first bending region (1424), a second bending region (1425), and a connecting section connecting between the first bending region (1424) and the second bending region (1425). The first bending region (1424) is located in a region of the transition portion (1423) close to the first connecting portion (1421), the second bending region (1425) is located in a region of the transition portion (1423) close to the second connecting portion (1422), and the first protruding portion (143) is adjacent to the first bending region (1424); The current collector (14) is arc-shaped in the first bending region (1424) and the second bending region (1425) respectively.

13. An energy storage device (100), characterized in that, It includes an electrode assembly and the end cap assembly (1) according to any one of claims 1 to 12. The electrode assembly includes a tab. The end cap assembly (1) further includes a terminal post (13). The terminal post (13) is mounted through the first insulating member (12) and connected to the second connecting portion (1422). The tab is welded to the welding region (1411) and abuts against the first protruding portion (143).

14. An electrical device, characterized in that, It includes an energy storage device (100) according to claim 13.

Images