End cap assemblies, energy storage devices and electrical equipment

Abstract

This invention provides an end cap assembly, an energy storage device, and an electrical appliance. The end cap assembly includes: a cover plate with a first mounting hole; a first insulating member including a body portion disposed on one side of the cover plate and a receiving groove formed in the body portion, the receiving groove having a first opening penetrating the side of the body portion away from the cover plate and a second opening penetrating the outer peripheral wall of the body portion, the bottom wall of the receiving groove having a second mounting hole penetrating the body portion and communicating with the first mounting hole, and a protruding edge provided in the area of ​​the side wall of the receiving groove adjacent to the first opening, the protruding edge forming a slot with the side wall and bottom wall of the receiving groove; an electrode post including a column portion and a flange portion connected to one end of the column portion, the column portion passing through the first opening into the second mounting hole and the first mounting hole, the flange portion abutting against the bottom wall of the receiving groove; a current collector including a disc portion, an extension portion, and a bent portion connecting the disc portion and the extension portion; the extension portion being inserted into the slot from the second opening and connected to the flange portion; the bent portion being located at the second opening.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to an end cap assembly, an energy storage device, and an electrical appliance. Background Technology

[0002] Rechargeable batteries, also known as secondary batteries or storage batteries, are batteries that can be recharged after discharge to reactivate the active materials and continue to be used. Their recyclable nature has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, so do the performance requirements, especially for energy density per unit volume. The volume of the wound electrode assembly is a crucial parameter for improving this energy density. If the wound electrode assembly is too small, there is less active electrode material, resulting in wasted internal space and lower energy density. Conversely, if the wound electrode assembly is too large, it hinders electrolyte wetting, preventing some active materials from functioning effectively. Therefore, a balance must be struck between the volume of the wound electrode assembly and the effectiveness of electrolyte wetting when designing the battery structure.

[0003] To improve the overall wetting effect of the wound electrode assembly end face, an adapter end extends from one side of the positive electrode current collector to form a gap between the current collector body and the top cover. This gap is filled with electrolyte and wets the wound cell downwards. However, after welding the positive electrode current collector body and the tab, this design requires bending the adapter end of the current collector to align the top cover and the wound cell and weld them to the cylindrical shell for sealing. Because the current collector is made of metal (usually aluminum), it has a certain yield strength. During bending, it may pull up the tab on the bent side and break it. To improve the welding strength on the bent side, the existing process involves an additional laser spot welding on the welding groove. This additional laser spot welding step requires repositioning and repositioning the welding area, which becomes one of the limiting factors for improving the production efficiency of secondary batteries. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. To this end, this invention provides an end cap assembly, an energy storage device, and an electrical device. The end cap assembly can prevent the current collector contained therein from pulling on the tabs of the battery cells when bent, thereby preventing the tabs from being broken and helping to improve the production yield of the battery cells.

[0005] To achieve the above objectives, in a first aspect, the present invention provides an end cap assembly, comprising:

[0006] The cover plate has a first mounting hole that penetrates its opposite sides along the thickness direction;

[0007] The first insulating member includes a body portion disposed on one side of the cover plate in the thickness direction and a receiving groove formed in the body portion. The receiving groove extends outward from the middle of the body portion to penetrate the outer peripheral wall of the body portion. The receiving groove has a first opening penetrating the side of the body portion away from the cover plate and a second opening penetrating the outer peripheral wall of the body portion. The first opening, the receiving groove, and the second opening are connected. The bottom wall of the receiving groove is provided with a second mounting hole, and the side wall of the receiving groove is provided with a protruding edge. The second mounting hole penetrates the body portion along the thickness direction of the cover plate and is correspondingly connected to the first mounting hole. The protruding edge is disposed in the area of ​​the side wall of the receiving groove adjacent to the first opening, and a slot is formed between the protruding edge and the side wall and the bottom wall of the receiving groove.

[0008] The pole includes a column portion and a flange portion connected to one end of the column portion. The column portion passes through the first opening and is connected to the second assembly hole and the first assembly hole. The flange portion abuts against the bottom wall of the receiving groove.

[0009] A current collector includes a disc body, an extension, and a bent portion connecting the disc body and the extension;

[0010] The extension is inserted into and received in the slot through the second opening, the extension is connected to the flange, the bent portion is located at the second opening, and the disc portion is located on the side of the second opening away from the extension.

[0011] In one embodiment, the number of the protruding edges is one, the protruding edges extend along the edge extension direction of the first opening, and the opposite ends of the protruding edges in the extension direction are respectively located on opposite sides of the first opening in a first direction, the first direction being perpendicular to the extension direction of the receiving groove.

[0012] In one embodiment, the number of protrusions is at least two, and each sidewall of the receiving groove in a first direction is provided with at least one protrusion, and each protrusion extends along the extension direction of the receiving groove, the first direction being perpendicular to the extension direction of the receiving groove; wherein, all the protrusions are at the same distance from the bottom wall of the receiving groove, and when multiple protrusions are provided on any sidewall of the receiving groove, the multiple protrusions are distributed at intervals along the extension direction of the receiving groove.

[0013] In one embodiment, a first protrusion is provided on the side of the convex edge facing the bottom wall of the receiving groove. The first protrusion includes at least one arc-shaped rib, wherein one end of the arc-shaped rib is connected to the side of the convex edge facing the bottom wall of the receiving groove, and the other end of the arc-shaped rib is suspended and extends toward the middle of the body portion. The first protrusion abuts against the side of the extension portion facing away from the pole post.

[0014] In one embodiment, the first insulating member further includes a stop portion connected to the sidewalls of opposite sides of the receiving groove, and near the area of ​​the second opening away from the bottom of the receiving groove, and extending toward the center of the body portion in a direction parallel to the bottom wall of the receiving groove.

[0015] In one embodiment, the stop portion is fixed to the sidewalls on opposite sides of the receiving groove by welding.

[0016] In one embodiment, the first insulating member further includes a flexible sheet connected to one side of the stop portion adjacent to the second opening. The flexible sheet is configured to bend together with the disc portion when it is folded relative to the extension portion to form the bend portion, and to at least partially conform to the inner side of the formed bend portion.

[0017] In one embodiment, the ratio between the thickness of the flexible sheet and the thickness of the stop portion is 0.35-0.8.

[0018] In one embodiment, the first insulating member further includes a second protrusion disposed on the side of the stop portion facing away from the bottom wall of the receiving groove.

[0019] In one embodiment, the stop portion includes a baffle plate, the opposite ends of which are respectively connected to the sidewalls of opposite sides of the receiving groove;

[0020] Alternatively, the stop portion includes a pair of oppositely arranged lugs, with the two mutually distant ends of the pair of lugs respectively connected to the sidewalls on opposite sides of the receiving groove.

[0021] In a second aspect, the present invention provides an energy storage device, including an end cap assembly as described in any of the above embodiments.

[0022] Thirdly, the present invention provides an electrical device including the energy storage device described above.

[0023] In the end cap assembly provided by the present invention, the receiving groove is formed on the body portion of the first insulating member, and the protruding edge is provided on the side wall of the receiving groove, so that the slot is formed on the first insulating member. Thus, by inserting the extension portion of the current collector into the slot, when the disc portion of the current collector is welded to the tab of the battery cell, the disc portion can be fixed when the current collector is bent. Using the insertion port of the slot as the axis, the end cap assembly is driven to swing towards the disc portion from the end portion away from the insertion port, thus bending the bent portion of the current collector. At this time, the resistance to bending the bent portion will press against the electrode assembly of the battery cell. The bent portion is located at the insertion port and will not pull the disc portion, thereby preventing the tab welded to the disc portion from being pulled apart, which helps to improve the production yield of the battery cell. Furthermore, the bending portion formed at the second opening allows for positioning of the bending portion, enabling standardized design of the bending portion during the bending process of the battery cell. This facilitates automated production design and improves the consistency of battery cells produced in batches. Additionally, the extension portion inserted into the slot limits the current collector, preventing it from rotating relative to the first insulating member and improving the torsional resistance of the battery cell.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an application scenario diagram of the energy storage device provided in the embodiments of the present invention in user-side energy storage.

[0027] Figure 2 This is a three-dimensional structural diagram of the end cap assembly provided in one embodiment of the present invention when the current collector is in a flattened state.

[0028] Figure 3 yes Figure 2 The diagram shows a three-dimensional structure of the end cap assembly from another perspective.

[0029] Figure 4 yes Figure 2 The cross-sectional view shown is along the IV-IV direction.

[0030] Figure 5 yes Figure 2 The end cap assembly shown is a cross-sectional view of the manifold in the folded state.

[0031] Figure 6 yes Figure 2 The diagram shows an exploded three-dimensional structure of the end cap assembly.

[0032] Figure 7 yes Figure 6 The end cap assembly shown is a three-dimensional exploded view from another perspective.

[0033] Figure 8 yes Figure 3 The diagram shows a three-dimensional structure of the end cap assembly after omitting the current collector.

[0034] Figure 9 This is a cross-sectional view of the end cap assembly provided in another embodiment of the present invention when the current collector is in a folded state.

[0035] Figure 10 This is a three-dimensional structural diagram of the end cap assembly provided in another embodiment of the present invention when the current collector is in a flattened state.

[0036] Figure 11 yes Figure 10 The end cap assembly shown is a cross-sectional view of the manifold in the folded state.

[0037] Figure 12 This is a three-dimensional structural diagram of the end cap assembly provided in another embodiment of the present invention when the current collector is in a flattened state.

[0038] Figure 13 yes Figure 12 The end cap assembly shown is a cross-sectional view of the manifold in the folded state.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100. Energy storage device; 200. Power conversion device; 300. First user load; 400. Second user load; 1. End cap assembly; 11. Cover plate; 111. Pressure relief hole; 112. First liquid injection hole; 113. First assembly hole; 114. First positioning groove; 12. First insulating component; 121. Body part; 1211. Second assembly hole; 122. Receiving groove; 1221. First opening; 1222. Second opening; 123. Protruding edge; 124. Liquid injection groove; 1241. Second liquid injection hole; 125. Gas collection groove; 1251. Vent hole; 1 26. Hollowed-out groove; 127. First protrusion; 128. Stop; 1281. Second protrusion; 129. Flexible sheet; 13. Current collector; 131. Disc; 1311. Welding groove; 1312. Central through hole; 132. Extension; 133. Bending part; 14. Pole post; 141. Column; 142. Flange; 15. Second insulating component; 151. First positioning block; 1511. Flange; 152. Second positioning groove; 16. Riveting block; 161. Second positioning block; 17. Sealing ring; 18. Explosion-proof valve; 19. Protective plate. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] To facilitate understanding of the energy storage device provided in the embodiments of the present invention, some common knowledge in the field of energy storage technology will be explained as follows.

[0043] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form according to future application needs. As we all know, to achieve the grand goal of carbon neutrality, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels. Currently, the generation of green electricity generally relies on photovoltaics, wind power, and hydropower. However, wind and solar energy generally suffer from strong intermittency and large fluctuations, which can cause grid instability, insufficient electricity during peak demand periods, and excessive electricity during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. Energy storage involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, the stored energy is converted back into electrical energy and released. Simply put, energy storage is like a large "power bank". When there is sufficient solar and wind power, electrical energy is stored and the stored power is released when needed.

[0044] Taking electrochemical energy storage as an example, this embodiment of the invention provides an energy storage device. The energy storage device is equipped with a chemical battery, which mainly uses the chemical elements in the chemical battery as the energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical battery. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0045] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0046] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the capacity for renewable energy absorption, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0047] (2) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios primarily operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity consumption during peak and off-peak periods, users with energy storage devices typically charge the cabinets / boxes during off-peak hours to reduce costs; during peak hours, they release the stored electricity for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices effectively provides backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0048] Please see Figure 1 This embodiment of the invention uses a residential energy storage scenario in user-side energy storage as an example to illustrate the energy storage device 100 provided in this embodiment. Of course, the energy storage device 100 provided in this embodiment is not limited to residential energy storage scenarios.

[0049] like Figure 1 As shown, this embodiment of the invention provides a residential energy storage system. The system includes a power conversion device 200 (photovoltaic panel), a first user load 300 (streetlight), a second user load 400 (e.g., household appliances such as air conditioners), and an energy storage device 100. The energy storage device 100 is a small energy storage box that can be wall-mounted to an outdoor wall. Specifically, the photovoltaic panel converts solar energy into electrical energy during periods of low electricity prices. The energy storage device 100 stores this electrical energy and supplies it to streetlights and household appliances during peak electricity prices, or provides power during power outages / power interruptions.

[0050] It is 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. The battery cells included in the energy storage device 100 may be cylindrical batteries. It should be noted that the battery cell includes a housing, an electrode assembly housed within the housing, and an end cap encapsulated at the opening of the housing. The end cap may be the end cap assembly 1 provided in the embodiments of the present invention.

[0051] Please combine Figures 2 to 7 This invention provides an end cap assembly 1, which can be used, but is not limited to, in battery cells containing electrolyte, such as lithium-ion secondary batteries. The end cap assembly 1 can serve as the positive terminal cap of the battery cell or as the negative terminal cap of the battery cell.

[0052] Specifically, please refer to the following: Figures 2 to 7In an embodiment of the present invention, the end cap assembly 1 includes a cover plate 11, a first insulating member 12, a current collector 13, and a terminal post 14. The cover plate 11 has a first mounting hole 113 extending through its opposite sides along its thickness direction. The first insulating member 12 includes a body portion 121 disposed on one side of the cover plate 11 in the thickness direction and a receiving groove 122 formed on the side of the body portion 121 facing away from the cover plate 11. The receiving groove 122 extends outward from the middle of the body portion 121 to penetrate the outer peripheral wall of the body portion 121. Figure 7 As shown, the receiving groove 122 has a first opening 1221 that passes through the body portion 121 on the side away from the cover plate 11, and a second opening 1222 that passes through the outer peripheral wall of the body portion 121. The first opening 1221 and the second opening 1222 of the receiving groove 122 may or may not be connected; preferably, the first opening 1221 and the second opening 1222 are connected, which facilitates the processing of the receiving groove 122. The receiving groove 122 includes a bottom wall parallel to the cover plate 11 and a pair of side walls perpendicular to the cover plate 11 and spaced apart from each other along a first direction, where the first direction is perpendicular to the extending direction of the receiving groove 122. The bottom wall of the receiving groove 122 is provided with a second mounting hole 1211, and the side wall of the receiving groove 122 is provided with a protruding edge 123 (i.e., a thin-walled structure with thickness extending from the side wall of the receiving groove 122 toward the center of the first opening 1221). The second mounting hole 1211 passes through the body portion 121 along the thickness direction of the cover plate 11 and is correspondingly connected to the first mounting hole 113. The protruding edge 123 is provided in the area of ​​the side wall of the receiving groove 122 adjacent to the first opening 1221, and a slot (not labeled in the figure) is formed between the protruding edge 123, the side wall, and the bottom wall of the receiving groove 122. The pole post 14 includes a column portion 141 and a flange portion 142 connected to one end of the column portion 141. The column portion 141 passes through the first opening 1221 and is connected to the second mounting hole 1211 and the first mounting hole 113. The flange portion 142 abuts against the bottom wall of the receiving groove 122. The current collector 13 includes a disc body 131, an extension 132, and a bending portion 133. The bending portion 133 is connected between the outer peripheral wall of the disc body 131 and one end of the extension 132 in the length direction.

[0053] Among them, such as Figure 3 and Figure 4 As shown, the extension 132 extends from the second opening 1222 of the receiving groove 122 through the outer peripheral wall of the body portion 121 (see... Figure 7 The extension 132 is inserted into and received within the slot, and is connected to the flange 142 by welding or other means; Figure 3As shown, the bent portion 133 is located at the second opening 1222 (i.e., the insertion port of the slot), and the disc portion 131 is located on the side of the second opening 1222 away from the extension portion 132.

[0054] It will be understood by those skilled in the art that, as Figure 5 As shown, when the end cap assembly 1 is applied to a battery cell, after the disc portion 131 is welded to the tab of the battery cell, the current collector 13 needs to be bent so that the extension portion 132 is folded relative to the disc portion 131, the cover plate 11 and the first insulating member 12 are aligned with the disc portion 131, thereby aligning the end cap assembly 1 with the electrode assembly of the battery cell and welding and sealing it with the housing of the battery cell.

[0055] In the end cap assembly 1 provided in the embodiment of the present invention, the body portion 121 of the first insulating member 12 is provided with the receiving groove 122, and the side wall of the receiving groove 122 is provided with the protrusion 123, so that the slot is formed on the first insulating member 12. Thus, by inserting the extension 132 of the current collector 13 into the slot, after the disc portion 131 of the current collector 13 is welded to the tab of the battery cell, the disc portion 131 can be fixed when the current collector 13 is bent. With the insertion port of the slot (i.e., the second opening 1222) as the axis, the end cap assembly 1 is driven to swing towards the disc portion 131 and bend the bent portion 133 of the current collector 13. At this time, the resistance to bending the bent portion 133 will press against the electrode assembly of the battery cell. The bent portion 133 is formed at the insertion port and will not pull the disc portion 131, thus preventing the tab welded to the disc portion 131 from being pulled apart. This avoids the thin tab being broken and helps to improve the production yield of the battery cell. Furthermore, the bending portion 133 is formed at the insertion port, which allows for positioning of the bending portion 133. This standardizes the bending process of the battery cell by incorporating the bending portion 133, facilitating automated production design and improving the consistency of mass-produced battery cells. Additionally, the extension portion 132, inserted into the slot, limits the current collector 13, preventing it from rotating relative to the first insulating member 12 and improving the torsional resistance of the battery cell.

[0056] It should be noted that, in the embodiments of the present invention, the end cap assembly 1 further includes other components such as a second insulating member 15, a riveting block 16, a sealing ring 17, an explosion-proof valve 18, and a protective sheet 19. The end cap assembly 1 can be applied to cylindrical batteries, in which case the cover plate 11 is correspondingly a disc-shaped cover plate; the end cap assembly 1 can also be applied to prismatic batteries, in which case the cover plate 11 is correspondingly a rectangular plate-shaped cover plate. The structure and function of the end cap assembly 1 provided in the embodiments of the present invention will be described in detail below, taking the application of the end cap assembly 1 to a cylindrical battery as an example.

[0057] Please combine Figure 4 , Figure 6 as well as Figure 7 In one embodiment of the present invention, the disc-shaped cover plate 11 has a pressure relief hole 111 extending through the cover plate 11 near its edge, and an explosion-proof valve 18 is provided on the side of the cover plate 11 facing the first insulating member 12. The explosion-proof valve 18 covers the end opening of the pressure relief hole 111 near the first insulating member 12 to facilitate effective explosion in the event of thermal runaway of a battery cell using the end cap assembly 1, thereby preventing the battery cell from exploding. Preferably, in this embodiment, a first recess (not labeled in the figure) is provided on the side of the cover plate 11 facing the first insulating member 12 near the edge of the pressure relief hole 111. The explosion-proof valve 18 is housed and installed in the first recess and welded to the cover plate 11. By housing the explosion-proof valve 18 in the first recess, the overall thickness and volume of the cover plate 11 and the explosion-proof valve 18 can be reduced. In other embodiments, the explosion-proof valve 18 can also be directly welded and fixed to the side of the cover plate 11 facing the first insulating member 12, and the first insulating member 12 can be provided with a groove for receiving the explosion-proof valve 18, which is not limited.

[0058] Furthermore, in Figure 4 , Figure 6 and Figure 7In the example, a protective sheet 19 is provided on the side of the cover plate 11 facing away from the first insulator 12. The protective sheet 19 covers the end opening of the pressure relief hole 111 away from the first insulator 12. The protective sheet 19 is used to protect the side of the explosion-proof valve 18 facing away from the first insulator 12, preventing the explosion-proof valve 18 from being scratched or damaged. Preferably, in this embodiment, a second recess (not labeled in the figure) is formed on the side of the cover plate 11 facing away from the first insulator 12 near the edge of the end opening of the pressure relief hole 111 away from the first insulator 12. The protective sheet 19 is housed and installed in the second recess. Housed the protective sheet 19 in the second recess, it does not increase the thickness and volume of the end cap assembly 1, which helps to improve the unit volume energy density of the battery cell using the end cap assembly 1. In other embodiments, the protective sheet 19 can also be directly fixed to the side of the cover plate 11 facing away from the first insulator 12, which is not limited. It should be noted that a vent hole is provided between the edge of the protective plate 19 and the pressure relief hole 111, and a sufficient gap should be maintained between the protective plate 19 and the explosion-proof valve 18 to ensure that the explosion-proof valve 18 can burst normally. Both the explosion-proof valve 18 and the protective plate 19 can be existing explosion-proof valves and protective plates, which will not be elaborated further.

[0059] like Figure 4 , Figure 6 and Figure 7 As shown, in one embodiment of the present invention, the cover plate 11 is further provided with a first liquid injection hole 112 penetrating the cover plate 11 in the region near the edge. The first liquid injection hole 112 and the aforementioned pressure relief hole 111 are respectively located on opposite sides of the cover plate 11. The first liquid injection hole 112 is used to inject electrolyte into the housing of the battery cell where the end cap assembly 1 is located, and the hole is sealed after the electrolyte injection is completed. Preferably, in Figure 4 , Figure 6 and Figure 7 In the example, the side of the cover plate 11 facing the first insulator 12 has a ring-shaped protrusion (not labeled in the figure) at the edge of the first injection hole 112. The ring-shaped protrusion is used to allow the electrolyte injected through the first injection hole 112 to flow along the ring-shaped protrusion, so as to prevent the electrolyte from entering between the two surfaces of the cover plate 11 and the first insulator 12 that are in contact with each other.

[0060] Please refer to it again. Figure 4 , Figure 6 as well as Figure 7In one embodiment of the present invention, the cover plate 11 further includes the first mounting hole 113 and the first positioning groove 114. The first mounting hole 113 is located between the pressure relief hole 111 and the first injection hole 112 and penetrates the central portion of the cover plate 11. The first positioning groove 114 is located on the side of the cover plate 11 facing away from the first insulating member 12 and surrounds and communicates with the first mounting hole 113. The first mounting hole 113 is used to insert the column portion 141 of the electrode post 14; the first positioning groove 114 is used to position and install the second insulating member 15, which will be described in detail later and will not be repeated here.

[0061] Optionally, in embodiments of the present invention, the cover plate 11 may be a conductive metal plate, which may be, but is not limited to, a copper plate, an aluminum plate, a copper alloy plate, or an aluminum alloy plate. Generally, when the end cap assembly 1 serves as the positive terminal cover of the battery cell, the cover plate 11 may be an aluminum plate; when the end cap assembly 1 serves as the negative terminal cover of the battery cell, the cover plate 11 may be a copper plate.

[0062] Please combine Figure 4 , Figures 6 to 8In one embodiment of the present invention, the outline of the body portion 121 of the first insulating member 12 is adapted to the outline of the cover plate 11, and the body portion 121 is generally in the shape of a disc. A receiving groove 122 is provided on the side of the body portion 121 facing away from the cover plate 11, and the receiving groove 122 extends radially from the center portion of the body portion 121 outward to penetrate the outer peripheral wall of the body portion 121. A protruding edge 123 is provided on the side wall of the receiving groove 122 in the region adjacent to the first opening 1221 (i.e., the side away from the cover plate 11). Optionally, in one possible embodiment, the number of protruding edges 123 is one, and the protruding edge 123 extends along the edge extension direction of the first opening 1221, with the opposite ends of the protruding edge 123 located on opposite sides of the first opening 1221 in the aforementioned first direction. In another possible implementation, the number of protruding edges 123 can be at least two. The receiving groove 122 has at least one protruding edge 123 on each side wall in the first direction, and each protruding edge 123 extends toward the middle of the body portion 121 along the extending direction of the receiving groove 122. The distance between all the protruding edges 123 and the bottom wall of the receiving groove 122 is the same. When multiple protruding edges 123 are provided on any side wall of the receiving groove 122, the multiple protruding edges 123 are spaced apart along the extending direction of the receiving groove 122. For example, two, three or more protruding edges 123 can be symmetrically arranged at intervals on the side walls on opposite sides of the receiving groove 122. The symmetrical arrangement of multiple protruding edges 123 at intervals on the side walls on opposite sides of the receiving groove 122 can not only save manufacturing materials and reduce the overall weight, but also achieve the effect of dispersing stress. In both embodiments, the slot can be formed between the outer wall of the protruding edge 123 facing the cover plate 11 and the side wall and bottom wall of the receiving groove 122 for inserting the extension 132 of the current collector 13. It should be noted that the depth of the slot in the thickness direction of the body portion 121 is greater than or equal to the thickness of the extension 132, so that the extension 132 can be smoothly inserted into the slot.

[0063] Furthermore, in Figure 4 , Figures 6 to 8In the example, the bottom wall of the receiving groove 122 has a second mounting hole 1211 that extends to the side of the body portion 121 near the cover plate 11. The second mounting hole 1211 communicates with the first mounting hole 113 on the cover plate 11 to accommodate the column portion 141 of the pole post 14. Preferably, in this embodiment, the orthographic projection of the protrusion 123 on the bottom wall of the receiving groove 122 is located outside the orthographic projection of the pole post 14 on the bottom wall. Thus, the protrusion 123 does not prevent the pole post 14 from accommodating the column portion 141 through the first opening 1221 into the communicating first mounting hole 113 and second mounting hole 1211.

[0064] Furthermore, in Figure 4 , Figures 6 to 8 In the example, the body 121 has an injection groove 124 corresponding to the first injection hole 112 and a gas collection groove 125 corresponding to the pressure relief hole 111 on the side facing the cover plate 11. The injection groove 124 and the gas collection groove 125 are located on opposite sides of the second assembly hole 1211. The injection groove 124 has multiple second injection holes 1241 connected to the first injection hole 112 for injecting electrolyte. The gas collection groove 125 has multiple vent holes 1251 for allowing gas to pass through and accumulate in the gas collection groove 125 when the battery cell containing the end cap assembly 1 experiences thermal runaway. The explosion-proof valve 18 can rupture when the accumulated gas pressure reaches a preset pressure value, thereby preventing the battery cell from exploding.

[0065] Please refer to it again. Figure 7 and Figure 8 In one embodiment of the present invention, a plurality of hollow grooves 126 are provided on the side of the body portion 121 facing away from the cover plate 11. The plurality of hollow grooves 126 are located in the area of ​​the body portion 121 other than the receiving groove 122, the liquid injection groove 124 and the gas collecting groove 125. Specifically, the plurality of hollow grooves 126 are distributed on opposite sides of the liquid injection groove 124. By providing a plurality of hollow grooves 126 on the body portion 121, the material consumption for manufacturing the first insulating member 12 can be reduced, and the wall thickness of each area of ​​the first insulating member 12 can be made nearly uniform. This helps to avoid the shrinkage problem caused by uneven wall thickness when the first insulating member 12 is manufactured by injection molding.

[0066] Please combine Figure 3 , Figures 5 to 7In one embodiment of the present invention, the disk portion 131 of the current collector 13 has a disk structure, the extension portion 132 of the current collector 13 has a sheet-like structure, the bent portion 133 is connected between the outer peripheral wall of the disk portion 131 and one end of the extension portion 132 in the length direction (i.e., the end near the disk portion 131), and the current collector 13 is generally key-shaped. Figure 3 As shown, in the flattened state, the other end of the extension 132 in the length direction (i.e., the end away from the disk body 131) extends from the insertion port of the slot on the first insulating member 12 (i.e., Figure 7 The extension portion 133 is inserted into the slot at the second opening 1222 shown. The bent portion 133 is formed at the second opening 1222, and the disc portion 131 is located on the side of the second opening 1222 away from the extension portion 132. It is easy to understand that the surface of the disc portion 131 facing the cover plate 11 in the flattened state is used to weld the tab of the battery cell where the end cap assembly 1 is located. After the disc portion 131 is welded to the tab, bending the bent portion 133 can align the end cap assembly 1 with the electrode assembly of the battery cell and weld it to the housing of the battery cell for sealing. As mentioned above, by inserting the extension portion 132 into the slot, the tab can be prevented from being pulled when the disc portion 131 is folded relative to the extension portion 132, thereby helping to improve the production yield of the battery cell.

[0067] Preferably, such as Figure 6 and Figure 7 As shown, in one embodiment of the present invention, notches are provided on opposite sides of the bent portion 133 to facilitate bending of the bent portion 133.

[0068] like Figure 3 As shown, in one embodiment of the present invention, the disk body 131 is further provided with a central through hole 1312 and a plurality of welding grooves 1311 surrounding the central through hole 1312, the plurality of welding grooves 1311 being used for welding the electrode tabs. The specific structure and function of the current collector 13 are basically the same as those of existing current collectors, and will not be described in detail here.

[0069] It should be noted that, in the embodiments of the present invention, when the end cap assembly 1 serves as the positive terminal cap of the battery cell, the current collector 13 may be made of the same aluminum material as the cover plate 11; when the end cap assembly 1 serves as the negative terminal cap of the battery cell, the current collector 13 may be made of the same copper material as the cover plate 11.

[0070] Please combine Figure 4 , Figures 6 to 8In one embodiment of the present invention, the column portion 141 of the electrode post 14 enters the receiving groove 122 through the first opening 1221 of the receiving groove 122, and is sequentially inserted into the communicating second mounting hole 1211 and the first mounting hole 113. The flange portion 142 abuts against the bottom wall of the receiving groove 122, and the flange portion 142 is used to weld the extension portion 132 of the current collector 13, thereby realizing the power transmission of the battery cell through the electrically connected electrode post 14 and the current collector 13. It is easy to understand that after the electrode post 14 is inserted into the second mounting hole 1211 and the first mounting hole 113, the extension portion 132 can be inserted into the slot of the first insulating member 12. Furthermore, the insertion of the extension portion 132 into the slot can pre-position the extension portion 132, which facilitates the welding of the current collector 13 and the electrode post 14.

[0071] Please see Figure 9 Preferably, in another embodiment of the present invention, a first protrusion 127 is provided on the side of the flange 123 facing the bottom wall of the receiving groove 122. The first protrusion 127 is used to abut against the side of the extension 132 inserted into the slot that faces away from the pole post 14. In this embodiment, by having the first protrusion 127 abut against the extension 132, the extension 132 can be made to fit tightly against the flange 142 of the pole post 14. Therefore, when welding the flange 142 and the extension 132, there will be no incomplete weld due to loose welding material, which helps to improve the structural stability and conductivity between the current collector 13 and the pole post 14.

[0072] Optionally, in one possible implementation, the first protrusion 127 includes at least one arc-shaped rib. One end of the arc-shaped rib is connected to the side of the protrusion 123 facing the bottom wall of the receiving groove 122, and the other end of the arc-shaped rib is suspended and extends toward the middle of the body portion 121. That is, the side of the arc-shaped rib with a smaller bending radius faces the side of the protrusion 123 facing the bottom wall of the receiving groove 122. Thus, when the extension portion 132 is inserted into the slot, the arc-shaped rib is squeezed by the extension portion 132 and undergoes elastic deformation, thereby generating an elastic thrust to abut against the extension portion 132, so that the extension portion 132 is pressed against the flange portion 142. Preferably, the first protrusion 127 includes a plurality of arc-shaped ribs, which are evenly distributed in different areas of the side of the protrusion 123 facing the bottom wall of the receiving groove 122, thereby ensuring a uniform abutment effect on different areas of the extension 132. In another possible embodiment, the first protrusion 127 may also be, but is not limited to, a rib, protrusion, or other protrusion structure made of elastic material such as silicone or rubber that can provide abutment effect. The protrusion structure can be adhesively disposed on the side of the protrusion 123 facing the bottom wall of the receiving groove 122. When the extension 132 is inserted into the slot, the protrusion structure can also be squeezed by the extension 132 and undergo elastic deformation, thereby generating an elastic thrust to abut the extension 132. This will not be elaborated further.

[0073] Furthermore, please combine Figure 10 and Figure 11 In another embodiment of the present invention, the first opening 1221 and the second opening 1222 of the receiving groove 122 are connected, and the first insulating member 12 further includes a stop portion 128, which is connected to the sidewalls on opposite sides of the receiving groove 122 and is close to the second opening 1222 (see...). Figure 7The stop portion 128 extends towards the center of the body portion 121 in a direction parallel to the bottom wall of the receiving groove 122, away from the bottom wall of the receiving groove 122. In this embodiment, the stop portion 128 can enhance the positioning effect of the bent portion 133 of the current collector 13, and can also flatten the uneven parts of the extension portion 132 adjacent to the bent portion 133, reducing the structural accuracy requirements of the parts and reducing production costs. It should be noted that the stop portion 128 is located on the side of the protrusion 123 near the bottom wall of the receiving groove 122 to ensure that the stop portion 128 can stop the extension portion 132 and the bent portion 133. Furthermore, when the convex edge 123 is provided with the aforementioned first protrusion 127, the side of the stop portion 128 facing the extension portion 132 can be flush with the side of the first protrusion 127 facing the extension portion 132, or it can protrude from the side of the first protrusion 127 facing the extension portion 132, thereby ensuring that the stop portion 128 can stop the extension portion 132 and the bent portion 133. The stop portion 128 can be fixed to the sidewalls of the receiving groove 122 on both sides by injection molding, welding, snap-fitting, or adhesive bonding. Preferably, in... Figure 10 and Figure 11 In the example, the stop portion 128 is fixed to the side walls on both sides of the receiving groove 122 by welding, which is a simple manufacturing process.

[0074] Optionally, such as Figure 10 and Figure 11 As shown, in one possible embodiment, the stop portion 128 includes a baffle plate, the opposite ends of which are respectively connected to the sidewalls of opposite sides of the receiving groove 122. The entire surface of the baffle plate facing the bottom wall of the receiving groove 122 can be used to stop the extension portion 132 and the bent portion 133, resulting in a large stopping area. In another possible embodiment, the stop portion 128 may also include a pair of oppositely arranged lugs, the two far apart ends of which are respectively connected to the sidewalls of opposite sides of the receiving groove 122. The surface of each lug facing the bottom wall of the receiving groove 122 is used to stop the extension portion 132 and the bent portion 133. There is a gap between the two adjacent ends of the pair of lugs, which can reduce the material consumption of the stop portion 128.

[0075] It is understood that in other embodiments, when the first opening 1221 and the second opening 1222 of the receiving groove 122 are not connected, a portion of the edge of the body portion 121 may be located between the first opening 1221 and the second opening 1222, and this portion of the edge of the body portion 121 may also serve as the stop portion 128.

[0076] Further preferably, please refer to Figure 12 and Figure 13 In another embodiment of the present invention, the first insulating member 12 further includes a second protrusion 1281 and / or a flexible sheet 129. Preferably, in Figure 12 and Figure 13 In the example, the first insulating member 12 includes both the second protrusion 1281 and the flexible sheet 129.

[0077] Among them, such as Figure 12 and Figure 13 As shown, the second protrusion 1281 is disposed on the side of the bottom wall of the stop portion 128 facing away from the receiving groove 122. The second protrusion 1281 is used to abut against the side of the disc portion 131 facing the extension portion 132 after the disc portion 131 is folded relative to the extension portion 132, which can support the disc portion 131 and prevent the bending portion 133 from being excessively bent, causing the collector 13 to break. Optionally, the second protrusion 1281 can be, but is not limited to, a rib, a protrusion, or other protruding structure that can play a supporting role, and there is no limitation on this.

[0078] like Figure 12 and Figure 13 As shown, the flexible sheet 129 is connected to the second opening 1222 of the stop portion 128 adjacent to the receiving groove 122 (see...). Figure 7 On one side of the disk portion 131, the flexible sheet 129 is used to bend together with the bent portion 133 when the disk portion 131 is folded relative to the extension portion 132, and at least partially adheres to the inner side of the formed bent portion 133 (i.e., the side with the smaller bending radius). Thus, after bending, the flexible sheet 129 provides a restoring elastic force to prevent the bent portion 133 from being excessively bent and causing the current collector 13 to break. The flexible sheet 129 may be made of materials such as plastic, but is not limited to this.

[0079] It is understandable that if the flexible sheet 129 is too thin, the elasticity it provides after bending is insufficient to prevent the bending portion 133 from being over-bent; conversely, if the flexible sheet 129 is too thick, its structural strength and bending strength are too great, which will hinder the bending portion 133 from bending, and an excessively thick flexible sheet 129 may break during bending, reducing product yield; therefore, the thickness of the flexible sheet 129 needs to be designed reasonably. Specifically, in Figure 12 and Figure 13 In the example, the ratio between the thickness of the flexible sheet 129 and the thickness of the stop portion 128 is preferably designed to be in the range of 0.35-0.8, so that the flexible sheet 129 can provide appropriate elasticity after bending and prevent the bending portion 133 from being over-bent.

[0080] It should be noted that, in the embodiments of the present invention, the stop portion 128, the second protrusion portion 1281 and the flexible sheet 129 are preferably integrally formed, which facilitates processing.

[0081] Please see Figure 6 , Figure 7 and combined Figures 2 to 4 In one embodiment of the present invention, the end cap assembly 1 further includes a second insulating member 15, a riveting block 16, and a sealing ring 17. The sealing ring 17 is fitted onto the outer wall of the column portion 141 of the pole post 14 to fill the space between the pole post 14 and the cover plate 11, thereby improving the sealing performance between the pole post 14 and the cover plate 11. Both the second insulating member 15 and the riveting block 16 have through holes for the column portion 141 to pass through. The second insulating member 15 is fitted onto the outer wall of the column portion 141 to achieve insulation between the cover plate 11 and the pole post 14. The riveting block 16 is located on the side of the second insulating member 15 away from the flange portion 142 and fitted onto the end of the column portion 141 away from the flange portion 142. The riveting block 16 is used to weld the column portion 141.

[0082] Among them, such as Figure 4 , Figure 6 and Figure 7 As shown, in one embodiment of the present invention, the side of the second insulating member 15 facing the cover plate 11 has a first positioning block 151 corresponding to the first positioning groove 114 on the cover plate 11, and the side of the first positioning block 151 facing the flange portion 142 has a flange 1511. The second insulating member 15 can be quickly positioned and installed on the cover plate 11 through the cooperation between the first positioning block 151 and the first positioning groove 114, and the flange 1511 fills the space between the inner wall of the first assembly hole 113 and the outer wall of the column portion 141, thereby achieving insulation between the cover plate 11 and the pole post 14. In other embodiments, the side of the second insulating member 15 facing the cover plate 11 can have a first positioning groove, and the cover plate 11 is correspondingly provided with a first positioning block, which can also achieve quick positioning and installation of the second insulating member 15 on the cover plate 11.

[0083] Furthermore, such as Figure 4 , Figure 6 and Figure 7As shown, in one embodiment of the present invention, a second positioning groove 152 is provided on the side of the second insulating member 15 facing away from the cover plate 11, and a second positioning block 161 corresponding to the second positioning groove 152 is protruding on the side of the riveting block 16 facing the second insulating member 15. The riveting block 16 can be quickly positioned and installed on the second insulating member 15 through the cooperation between the second positioning block 161 and the second positioning groove 152. In other embodiments, a second positioning groove can be provided on the side of the second insulating member 15 facing away from the cover plate 11, and the riveting block 16 is correspondingly provided with a second positioning block, which can also achieve the quick positioning and installation of the riveting block 16 on the second insulating member 15.

[0084] It should be noted that, in the embodiments of the present invention, the groove outline of the first positioning groove 114 and the outer outline of the first positioning block 151 are adapted to each other, and are not limited to a cross shape or a straight line shape; similarly, the groove outline of the second positioning groove 152 and the outer outline of the second positioning block 161 are adapted to each other, and are not limited to a cross shape or a straight line shape. The second insulating member 15 and the riveting block 16 can respectively adopt existing plastic on the cover plate and riveting blocks, which will not be elaborated further.

[0085] In summary, in the end cap assembly 1 provided by the embodiments of the present invention, by inserting the extension 132 of the current collector 13 into the slot on the first insulating member 12, it is possible to avoid pulling on the tabs of the battery cell when the disc portion 131 of the current collector 13 is folded relative to the extension 132, thus preventing the thin tabs from being broken and helping to improve the production yield of the battery cell. Furthermore, the bending portion 133 is inserted into the opening of the slot, which can position the bending portion 133, so that the bending process of the battery cell can be standardized with the bending portion 133, which is convenient for automated production design. In addition, the extension 132 inserted into the slot can limit the current collector 13, preventing the current collector 13 from rotating relative to the first insulating member 12, thereby improving the torsional resistance of the battery cell.

[0086] Furthermore, this embodiment of the invention also provides an energy storage device 100, which includes at least one battery cell. The battery cell includes a housing, an electrode assembly housed within the housing, and end caps respectively encapsulated at openings in the housing. The end caps can be the end cap assembly 1 provided in this embodiment. Since the end caps in the battery cell encompass all the technical solutions of all the above embodiments, they possess at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.

[0087] It should be noted that, similar to existing battery cells, the battery cell also includes other components, such as an electrolyte housed in the housing for wetting the electrode assembly, which will not be elaborated upon; the electrode assembly can be an existing wound electrode assembly or a stacked electrode assembly, which is not limited thereto.

[0088] Furthermore, this embodiment of the invention also provides an electrical device, which includes an electrical device body and the energy storage device 100 provided in this embodiment of the 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 all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0089] The electrical equipment mentioned herein may include, but is not limited to, mobile phones, tablets, laptops, desktop computers, smart bracelets, smartwatches, e-readers, game consoles, toys, and other electronic devices, as well as the aforementioned household energy storage systems, without limitation.

[0090] In the description of this invention, the terms "embodiment," "specific embodiment," "example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An end cap assembly (1), characterized in that, include: The cover plate (11) has a first mounting hole (113) through its opposite sides along the thickness direction; The first insulating member (12) includes a body portion (121) disposed on one side of the cover plate (11) in the thickness direction and a receiving groove (122) formed in the body portion (121). The receiving groove (122) extends outward from the middle of the body portion (121) to penetrate the outer peripheral wall of the body portion (121). The receiving groove (122) has a first opening (1221) penetrating the side of the body portion (121) away from the cover plate (11) and a second opening (1222) penetrating the outer peripheral wall of the body portion (121). The first opening (1221) and the receiving groove ( The accommodating groove (122) and the second opening (1222) are connected. The bottom wall of the accommodating groove (122) is provided with a second mounting hole (1211). The side wall of the accommodating groove (122) is provided with a protruding edge (123). The second mounting hole (1211) passes through the body part (121) along the thickness direction of the cover plate (11) and is correspondingly connected to the first mounting hole (113). The protruding edge (123) is provided in the area of ​​the side wall of the accommodating groove (122) adjacent to the first opening (1221). The protruding edge (123) forms a slot with the side wall and the bottom wall of the accommodating groove (122). The pole (14) includes a pole body (141) and a flange (142) connected to one end of the pole body (141). The pole body (141) passes through the first opening (1221) into the communicating second assembly hole (1211) and the first assembly hole (113). The flange (142) abuts against the bottom wall of the receiving groove (122). The collector (13) includes a disc body (131), an extension (132), and a bent portion (133) connecting the disc body (131) and the extension (132); The extension (132) is inserted into and received in the slot through the second opening (1222), the extension (132) is connected to the flange (142), the bend (133) is located at the second opening (1222), and the disc (131) is located on the side of the second opening (1222) away from the extension (132).

2. The end cap assembly (1) as claimed in claim 1, characterized in that, The number of the protruding edge (123) is one. The protruding edge (123) extends along the edge extension direction of the first opening (1221), and the two opposite ends of the protruding edge (123) in the extension direction are respectively located on the opposite sides of the first opening (1221) in a first direction, which is perpendicular to the extension direction of the receiving groove (122).

3. The end cap assembly (1) as claimed in claim 1, characterized in that, The number of the protruding edges (123) is at least two. The receiving groove (122) is provided with at least one protruding edge (123) on each side wall in the first direction, and each protruding edge (123) extends along the extension direction of the receiving groove (122), the first direction being perpendicular to the extension direction of the receiving groove (122). Wherein, all of the protruding edges (123) are at the same distance from the bottom wall of the receiving groove (122), and when multiple protruding edges (123) are provided on any side wall of the receiving groove (122), the multiple protruding edges (123) are distributed at intervals along the extension direction of the receiving groove (122).

4. The end cap assembly (1) as claimed in claim 1, characterized in that, The convex edge (123) has a first protrusion (127) on the side facing the bottom wall of the receiving groove (122). The first protrusion (127) includes at least one arc-shaped rib. One end of the arc-shaped rib is connected to the side of the convex edge (123) facing the bottom wall of the receiving groove (122), and the other end of the arc-shaped rib is suspended and extends toward the middle of the body part (121). The first protrusion (127) abuts against the side of the extension part (132) facing away from the pole post (14).

5. The end cap assembly (1) as claimed in claim 1, characterized in that, The first insulating member (12) further includes a stop portion (128) which is connected to the sidewalls of opposite sides of the receiving groove (122), and is close to the area of ​​the second opening (1222) away from the bottom wall of the receiving groove (122), and extends toward the center of the body portion (121) in a direction parallel to the bottom wall of the receiving groove (122).

6. The end cap assembly (1) as claimed in claim 5, characterized in that, The stop (128) is fixed to the side walls of the receiving groove (122) on both sides by welding.

7. The end cap assembly (1) as claimed in claim 5, characterized in that, The first insulating member (12) further includes a flexible sheet (129) connected to the side of the stop portion (128) adjacent to the second opening (1222), the flexible sheet (129) being used to bend together with the disc portion (131) when it is folded relative to the extension portion (132) to form the bent portion (133), and at least partially adhering to the inside of the formed bent portion (133).

8. The end cap assembly (1) as claimed in claim 7, characterized in that, The ratio between the thickness of the flexible sheet (129) and the thickness of the stop portion (128) is 0.35-0.

8.

9. The end cap assembly (1) as claimed in claim 5, characterized in that, The first insulating member (12) further includes a second protrusion (1281), which is disposed on the side of the bottom wall of the stop (128) facing away from the receiving groove (122).

10. The end cap assembly (1) as claimed in claim 5, characterized in that, The stop (128) includes a baffle plate, and the two opposite ends of the baffle plate are respectively connected to the side walls of the opposite sides of the receiving groove (122); Alternatively, the stop (128) may include a pair of opposite lugs, the two ends of which are far apart from each other and are respectively connected to the sidewalls on opposite sides of the receiving groove (122).

11. An energy storage device (100), characterized in that, Includes the end cap assembly (1) as described in any one of claims 1 to 10.

12. An electrical appliance, characterized in that, Includes the energy storage device (100) as described in claim 11.

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