Top cover assembly, energy storage device, energy storage module and electric equipment

Abstract

The utility model relates to a top cover assembly, an energy storage device, an energy storage module and electric equipment. The top cover assembly comprises a flow collecting disc, a cover body and a folding tubular connecting component, wherein the flow collecting disc is of a disc-shaped structure. The cover body is of a disc-shaped structure, and a pole is arranged on the cover body in a penetrating mode. One end of the folded tubular connecting member is electrically welded with the collector plate, the other end of the folded tubular connecting member is welded with the pole, the folded tubular connecting member can be stretched, compressed and bent along the length direction, and when the folded tubular connecting member is in a compressed state, at least part of the folded tubular connecting member sections are mutually nested; the cover body and the flow collecting plate are oppositely arranged, and the projection of the cover body on the flow collecting plate and the flow collecting plate are concentrically arranged. The top cover assembly is easy to install, and the concentricity of the cover body and the shell can be guaranteed when the cover is covered.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a top cover assembly, an energy storage device, an energy storage module and electrical equipment. Background Art

[0002] With the development of new energy technology, the application of lithium batteries is becoming more and more extensive. The negative collector of existing cylindrical lithium batteries is connected to the negative pole through a long plate-shaped connecting piece. During assembly, the collector is put into the shell with the battery cell. The long plate-shaped connecting piece needs to be bent twice before the top cover can cover the shell opening. During the closing process, the bending position and angle of the long plate-shaped connecting piece cannot be accurately controlled, so it is difficult to ensure the concentricity of the top cover and the shell. There is a probability that the top cover and the shell will interfere and cannot accurately cover the shell opening. Not only is it inconvenient to operate, but it is also easy to cause damage to the top cover or shell, affecting the safety performance of the battery cell. Utility Model Content

[0003] Based on this, it is necessary to provide a top cover assembly, an energy storage device, an energy storage module and electrical equipment to reduce the difficulty of closing the cover.

[0004] A top cover assembly, comprising:

[0005] A current collecting disk, wherein the current collecting disk is a disc-shaped structure;

[0006] A cover body, the cover body is a disc-shaped structure, and a pole is provided on the cover body; and,

[0007] A folded tubular connecting member, one end of which is welded to the collecting disk, and the other end is welded to the pole, the folded tubular connecting member can be stretched, compressed and bent along its length direction, when the folded tubular connecting member is in a compressed state, at least part of the folded tubular connecting member segments are nested with each other, the cover body is arranged opposite to the collecting disk, and the projection of the cover body on the collecting disk is concentric with the collecting disk.

[0008] The technical solution is further described below:

[0009] In one embodiment, an end plate is provided at one end of the folded tubular connecting member welded to the pole, the end plate is provided with an embedding hole, the pole has a flange portion, and the pole is inserted into the flange portion of the pole by the other end of the folded tubular connecting member and clamped in the embedding hole.

[0010] In one of the embodiments, the foldable tubular connecting member includes a plurality of foldable tube segments connected in sequence, and the diameter of each foldable tube segment gradually increases along the direction from the collecting plate to the cover body. In the stretched state, each foldable tube segment is sequentially unfolded along the axial direction, and in the compressed state, each foldable tube segment is sequentially nested from the inside to the outside to form a plurality of concentric annular structures.

[0011] In one embodiment, the cover body is provided with a mounting hole, the pole is passed through the mounting hole, and a sealing ring is provided between the pole and the cover body.

[0012] In one embodiment, the top cover assembly further includes a pressing block, and one end of the pole away from the folded tubular connecting member passes through the mounting hole and is fixedly connected to the pressing block.

[0013] In one embodiment, the top cover assembly further includes a first insulating member and a second insulating member, wherein the first insulating member is disposed between the pressing block and the cover body, and the second insulating member is disposed between the cover body and the collecting plate, and the pole is electrically insulated from the cover body.

[0014] In one of the embodiments, the collecting plate is provided with an air vent, the cover body is provided with an explosion-proof valve, and when the folded tubular connecting member is in the compressed state, the air vent and the explosion-proof valve are arranged opposite to each other.

[0015] In one of the embodiments, a welding rib is protruded from a side of the current collecting plate away from the cover body, and the welding rib extends along the circumference of the current collecting plate.

[0016] On the other hand, the present application also provides an energy storage device, including an electrode assembly, a shell and the above-mentioned top cover assembly, wherein one end of the shell has an opening, the collecting plate is welded to one end of the electrode assembly, the electrode assembly is accommodated in the shell, and the top cover assembly is covered on the shell and closes the opening.

[0017] On the other hand, the present application also provides an energy storage module, comprising the above energy storage device

[0018] On the other hand, the present application also provides an electrical equipment, including the above-mentioned energy storage device.

[0019] In the above-mentioned top cover assembly, energy storage device, energy storage module and electrical equipment, the collector plate and the pole are welded by folding the tubular connecting member, thereby realizing the electrical connection between the collector plate and the pole. At the same time, by utilizing the characteristics of the folding tubular connecting member that can be stretched, compressed and bent along its length direction, before the collector plate is installed and the cover body is installed into the housing of the energy storage device, the folding tubular connecting member can be in an extended state, at which time the folding tubular connecting member can be bent at will, thereby facilitating the adjustment of the posture of the cover body. During the process of the cover body being installed into the shell of the energy storage device, the cover body gradually approaches the current collecting disk, so that the folded tubular connecting member is gradually compressed, and at least part of the folded tubular connecting member segments are nested with each other. At this time, the rigidity of the folded tubular connecting member is gradually increased. Since the folded tubular connecting member is completely compressed to a compressed state, the projection of the cover body on the current collecting disk is arranged concentrically with the current collecting disk. Therefore, during the process of the folded tubular connecting member being gradually compressed so that at least part of the folded tubular connecting member segments are nested with each other, the folded tubular connecting member can guide the cover body to align with the current collecting disk according to a predetermined trajectory, thereby ensuring the concentricity of the cover body with the shell during the process of entering the shell, thereby avoiding interference and scratching between the cover body and the inner wall of the shell, and improving the safety performance of the electrode assembly. At the same time, the process of bending the connecting sheet is omitted, the difficulty of operation is reduced, and the production efficiency and quality can be improved. In addition, the folded tubular connecting member structure has a large flow area, which can avoid the occurrence of overcurrent phenomenon, further improving the safety performance of the electrode assembly. In addition, when the top cover assembly is transported or stored, the folded tubular connecting member can be compressed to a compressed state, thereby reducing the space occupied by the top cover assembly and facilitating transportation or storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0023] Figure 1 Schematic diagram of the structure of a top cover assembly according to an embodiment.

[0024] Figure 2 for Figure 1The top cover assembly shown in FIG. 1 is a schematic structural diagram of the top cover assembly when the folded tubular connecting member is in a stretched state.

[0025] Figure 3 for Figure 2 A cross-sectional view of the top cover assembly is shown in FIG.

[0026] Figure 4 for Figure 1 The top cover assembly shown in FIG. 1 is a schematic structural diagram of the top cover assembly when the folded tubular connecting member is in a compressed state.

[0027] Figure 5 for Figure 4 A cross-sectional view of the top cover assembly shown in FIG.

[0028] Figure 6 It is a schematic structural diagram of a current collecting plate according to an embodiment.

[0029] Figure 7 Schematic diagram of the structure of an energy storage device according to an embodiment.

[0030] Figure 8 for Figure 7 A cross-sectional view of the energy storage device shown in FIG.

[0031] Description of reference numerals:

[0032] 10. Collecting plate; 11. Air vent; 12. Welding ribs; 20. Cover; 21. Explosion-proof valve; 30. Folding tubular connecting member; 31. Foldable pipe section; 32. End plate; 40. Pole; 41. Flange; 50. Press block; 60. Sealing ring; 70. First insulating member; 80. Second insulating member; 90. Shell. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0039] See also Figures 1 to 3 The top cover assembly of one embodiment includes a current collecting plate 10, a cover body 20 and a folded tubular connecting member 30, wherein the current collecting plate 10 is used to collect current and is a disc-shaped structure. The cover body 20 is used to seal the opening of the housing 90 and is also a disc-shaped structure. A pole 40 is penetrated through the cover body 20. One end of the folded tubular connecting member 30 is welded to the current collecting plate 10 and the other end is welded to the pole 40. The folded tubular connecting member 30 can be stretched, compressed and bent along its length direction. Figure 4 as well as Figure 5 When the folded tubular connecting member 30 is in a compressed state, at least some of the folded tubular connecting member segments are nested with each other, the cover body 20 is arranged opposite to the current collecting plate 10, and the projection of the cover body 20 on the current collecting plate 10 is arranged concentrically with the current collecting plate 10. The folded tubular connecting member segments refer to the foldable tube segments 31 in the folded tubular connecting member 30 that are sequentially connected along the length direction thereof.

[0040] In the above-mentioned top cover assembly, the collector plate 10 and the pole 40 are welded by the folded tubular connecting member 30, thereby realizing the electrical connection between the collector plate 10 and the pole 40. At the same time, by utilizing the characteristics of the folded tubular connecting member 30 that can be stretched, compressed and bent along its length direction, before the collector plate 10 is installed and the cover body 20 is installed into the housing 90 of the energy storage device, the folded tubular connecting member 30 can be in an extended state, and at this time, the folded tubular connecting member 30 can be bent at will, so as to facilitate the adjustment of the posture of the cover body 20. During the process of inserting the cover 20 into the shell 90 of the energy storage device, the cover 20 gradually approaches the current collecting plate 10, so that the folded tubular connecting member 30 is gradually compressed, and at least part of the folded tubular connecting member segments are nested with each other. At this time, the rigidity of the folded tubular connecting member 30 is gradually increased. Since the folded tubular connecting member 30 is completely compressed to the compressed state, the projection of the cover 20 on the current collecting plate 10 is arranged concentrically with the current collecting plate 10. Therefore, during the process of gradually compressing the folded tubular connecting member 30 so that at least part of the folded tubular connecting member segments are nested with each other, the folded tubular connecting member 30 can guide the cover 20 to align with the current collecting plate 10 according to a predetermined trajectory, ensuring the concentricity of the cover 20 with the shell 90 during the process of entering the shell 90, thereby avoiding interference and scratching between the cover 20 and the inner wall of the shell 90. At the same time, the process of bending the connecting sheet is omitted, the difficulty of operation is reduced, and the production efficiency and quality can be improved. Moreover, the folded tubular connecting member 30 has a large flow area, which can avoid the over-flow phenomenon, further improving the safety performance of the energy storage device. In addition, when the top cover assembly is transported or stored, the folded tubular connecting member 30 can be compressed to a compressed state, thereby reducing the space occupied by the top cover assembly and facilitating transportation or storage.

[0041] See also Figure 3 Optionally, in one embodiment, an end of the folded tubular connecting member 30 welded to the pole 40 is provided with an end plate 32, the end plate 32 is provided with an embedding hole, one end of the pole 40 has a flange portion 41, and the pole 40 is inserted into the flange portion of the pole from the other end of the folded tubular connecting member and is clamped in the embedding hole. Specifically, the end of the pole 40 away from the flange portion can pass through the embedding hole, and the flange portion 41 and the end plate 32 are mutually clamped, thereby preventing the pole 40 from falling out of the embedding hole, so that the subsequent welding of the pole 40 and the folded tubular connecting member 30 is facilitated, and the connection stability is improved, thereby ensuring the reliability of the electrical connection between the pole 40 and the folded tubular connecting member 30, and avoiding the occurrence of poor contact.

[0042] Further, one end of the folded tubular connecting member 30 connected to the current collecting plate 10 may be an open structure or a closed structure, and the folded tubular connecting member 30 is welded to the current collecting plate 10. In other embodiments, the folded tubular connecting member 30 may also be bonded to the current collecting plate 10 by conductive adhesive. Optionally, in one embodiment, the folded tubular connecting member 30 may be made of metal, so as to ensure the structural strength and conductive performance of the folded tubular connecting member 30.

[0043] Continue to see Figure 3 In one embodiment, the foldable tubular connecting member 30 includes a plurality of foldable tube segments 31 connected in sequence, and the diameter of each foldable tube segment 31 gradually increases along the direction from the collecting plate 10 to the cover body 20. In the stretched state, each foldable tube segment 31 is sequentially unfolded in the axial direction, so that the foldable tubular connecting member 30 is axially elongated and bendable, so as to adjust the posture of the cover body 20. Figure 5 In the compressed state, each foldable tube segment 31 is nested in sequence from the inside to the outside to form a plurality of concentric ring structures, which can greatly shorten the length of the foldable tubular connecting member 30 in the compressed state, reduce the space occupied by the tubular connecting member 30, and further reduce the distance between the cover body 20 and the collecting plate 10, thereby improving the energy density of the energy storage device.

[0044] See also Figure 1 In one embodiment, the collecting plate 10 is provided with a vent hole 11, and the cover body 20 is provided with an explosion-proof valve 21. When the folded tubular connecting member 30 is in a compressed state, the vent hole 11 and the explosion-proof valve 21 are arranged opposite to each other, and the vent hole 11 can ensure ventilation inside the energy storage device. When the air pressure inside the energy storage device rises to a threshold value, the explosion-proof valve 21 can be opened to release the pressure, thereby preventing the energy storage device from having safety accidents such as high-pressure explosion.

[0045] See also Figure 6 In one embodiment, a welding rib 12 is convexly provided on the side of the current collecting plate 10 facing away from the cover body 20. The welding rib 12 is used to be welded to the welding copper nozzle of the electrode assembly. The welding rib 12 extends along the circumference of the current collecting plate 10, that is, the welding rib 12 is an arc-shaped structure. Specifically, the welding ribs on the traditional current collecting plate are straight strip structures extending along the radial direction of the current collecting plate. In order to ensure that the welding ribs are aligned with the welding copper nozzle, the current collecting plate needs to be installed in the shell at a fixed phase, which makes positioning inconvenient. In the present application, by configuring the welding rib 12 as an arc-shaped structure concentric with the current collecting plate 10, it is ensured that after the current collecting plate 10 is installed in the shell 90 at different phases, the welding rib 12 can still be aligned with the welding copper nozzle, thereby improving the installation tolerance of the current collecting plate 10 and reducing the difficulty of installation.

[0046] Furthermore, the number of the welding ribs 12 can be multiple, such as two, three, four or more, so as to make the current output more uniform. Furthermore, the multiple welding ribs 12 are concentrically arranged and spaced in sequence along the radial direction of the current collecting plate 10 .

[0047] See also Figure 2 In one embodiment, the cover 20 is provided with a mounting hole, the pole 40 is inserted into the mounting hole, and a sealing ring 60 is provided between the pole 40 and the cover 20. The sealing ring 60 is used to seal the gap between the pole 40 and the cover 20, and can also isolate the pole 40 from the cover 20 to prevent the pole 40 from being electrically conductive with the cover 20.

[0048] Furthermore, the top cover assembly further includes a pressing block 50, and one end of the pole 40 away from the folded tubular connecting member 30 passes through the mounting hole and is fixedly connected to the pressing block 50. The pressing block 50 can limit the pole 40 in the mounting hole to prevent the pole 40 from coming out of the cover body 20.

[0049] Continue to see Figure 5 In one embodiment, the top cover assembly further includes a first insulating member 70, which is disposed between the pressing block 50 and the cover 20, and is used to further isolate the pole 40 from the cover 20 to prevent electrical conduction between the pole 40 and the cover 20. The first insulating member 70 may be made of a colloid material.

[0050] In one embodiment, the top cover assembly further includes a second insulating member 80, which is disposed between the cover body 20 and the current collecting plate 10, and the pole 40 is electrically insulated from the cover body 20. The second insulating member 80 is used to isolate the cover body 20 from the current collecting plate 10 to prevent the current collecting plate 10 from being electrically conductive with the cover body 20. The second insulating member 80 may be made of a colloid material.

[0051] See also Figure 7 as well as Figure 8 An embodiment of the present application further provides an energy storage device, including an electrode assembly (not shown), a shell 90 and a top cover assembly of any of the above embodiments, wherein one end of the shell 90 has an opening, the collecting plate 10 is welded to one end of the electrode assembly, the electrode assembly is disposed in the shell 90, and the top cover assembly is covered on the shell 90 and closes the opening of the shell 90.

[0052] An embodiment of the present application further provides an energy storage module, comprising an energy storage device according to any of the above embodiments. Specifically, there may be multiple energy storage devices, which are connected in series or in parallel.

[0053] Furthermore, another embodiment of the present application also provides an electrical device, including the energy storage device of any of the above embodiments, and the energy storage device is used to supply power to the electrical device.

[0054] In the above energy storage device, energy storage module and electrical equipment, the collector plate 10 and the pole 40 are welded by the folded tubular connecting member 30, thereby realizing the electrical connection between the collector plate 10 and the pole 40. At the same time, by utilizing the characteristics of the folded tubular connecting member 30 that can be stretched, compressed and bent along its length direction, before the collector plate 10 is installed and the cover body 20 is installed into the housing 90 of the energy storage device, the folded tubular connecting member 30 can be in an extended state, and at this time, the folded tubular connecting member 30 can be bent at will, so as to facilitate the adjustment of the posture of the cover body 20. During the process of inserting the cover 20 into the shell 90 of the energy storage device, the cover 20 gradually approaches the current collecting plate 10, so that the folded tubular connecting member 30 is gradually compressed, and at least part of the folded tubular connecting member segments are nested with each other. At this time, the rigidity of the folded tubular connecting member 30 is gradually increased. Since the folded tubular connecting member 30 is completely compressed to the compressed state, the projection of the cover 20 on the current collecting plate 10 is arranged concentrically with the current collecting plate 10. Therefore, during the process of gradually compressing the folded tubular connecting member 30 so that at least part of the folded tubular connecting member segments are nested with each other, the folded tubular connecting member 30 can guide the cover 20 to align with the current collecting plate 10 according to a predetermined trajectory, ensuring the concentricity of the cover 20 with the shell 90 during the process of entering the shell 90, thereby avoiding interference and scratching between the cover 20 and the inner wall of the shell 90. At the same time, the process of bending the connecting sheet is omitted, the difficulty of operation is reduced, and the production efficiency and quality can be improved. Moreover, the folded tubular connecting member 30 has a large flow area, which can avoid the over-flow phenomenon, further improving the safety performance of the energy storage device. In addition, when the top cover assembly is transported or stored, the folded tubular connecting member 30 can be compressed to a compressed state, thereby reducing the space occupied by the top cover assembly and facilitating transportation or storage.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A top cover assembly, characterized in that: include: A current collecting disk, wherein the current collecting disk is a disc-shaped structure; A cover body, the cover body is a disc-shaped structure, and a pole is provided on the cover body; as well as, A folded tubular connecting member, one end of which is welded to the collecting disk, and the other end is welded to the pole, the folded tubular connecting member can be stretched, compressed and bent along its length direction, when the folded tubular connecting member is in a compressed state, at least part of the folded tubular connecting member segments are nested with each other, the cover body is arranged opposite to the collecting disk, and the projection of the cover body on the collecting disk is concentric with the collecting disk.

2. The top cover assembly according to claim 1, characterized in that: One end of the folded tubular connecting member welded to the pole is provided with an end plate, the end plate is provided with an embedding hole, the pole has a flange portion, and the pole is inserted into the flange portion of the pole through the other end of the folded tubular connecting member and clamped in the embedding hole.

3. The top cover assembly according to claim 1, characterized in that: The foldable tubular connecting component includes a plurality of foldable tube segments connected in sequence, and along the direction from the collecting plate to the cover body, the diameter of each foldable tube segment gradually increases. In the stretched state, each foldable tube segment is sequentially unfolded along the axial direction. In the compressed state, each foldable tube segment is sequentially nested from the inside to the outside to form a plurality of concentric annular structures.

4. The top cover assembly according to claim 1, characterized in that: The cover body is provided with a mounting hole, the pole is passed through the mounting hole, and a sealing ring is provided between the pole and the cover body.

5. The top cover assembly according to claim 4, characterized in that: The top cover assembly also includes a pressing block, and one end of the pole away from the folded tubular connecting member passes through the mounting hole and is fixedly connected to the pressing block.

6. The top cover assembly according to claim 5, characterized in that: The top cover assembly further includes a first insulating member and a second insulating member, wherein the first insulating member is disposed between the pressing block and the cover body, and the second insulating member is disposed between the cover body and the current collecting plate, and the pole is electrically insulated from the cover body.

7. The top cover assembly according to claim 1, characterized in that: The collecting plate is provided with an air hole, and the cover body is provided with an explosion-proof valve. When the folded tubular connecting member is in the compressed state, the air hole and the explosion-proof valve are arranged opposite to each other.

8. The top cover assembly according to claim 1, characterized in that: A welding rib is protrudingly provided on a side of the current collecting plate away from the cover body, and the welding rib extends along the circumference of the current collecting plate.

9. An energy storage device, characterized in that: It comprises an electrode assembly, a shell and a top cover assembly according to any one of claims 1 to 8, wherein one end of the shell has an opening, the collecting plate is welded to one end of the electrode assembly, the electrode assembly is accommodated in the shell, and the top cover assembly is covered on the shell and closes the opening.

10. An energy storage module, characterized in that: Includes the energy storage device as described in claim 9.

11. An electrical device, characterized in that: Includes the energy storage device as described in claim 9.

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