Cover plate mechanism, battery and electric equipment

Abstract

The utility model provides a cover plate mechanism, a battery and electric equipment, and relates to the technical field of lithium ion batteries. According to the cover plate mechanism provided by the utility model, the cover plate assembly is fixedly mounted through the embedding fit of the ring-shaped concave part and the first through hole of the cover plate assembly, and the rod part of the pole is inserted into the second through hole of the press-riveting component, so that the assembly of the press-riveting component, the pole and the connecting piece can be completed. Compared with the prior art that the terminal post and the riveting block are riveted firstly, the cover plate mechanism provided by the invention fixes the cover plate assembly by utilizing the pressing riveting component, and meanwhile, the connecting piece and the terminal post are pre-formed into an integrated structure, so that the number of parts in the assembling process is reduced, and the assembling efficiency is improved. And the procedure of firstly riveting the pole in the prior art is also avoided, so that the production efficiency is improved, and the cost of the cover plate mechanism and the battery applying the cover plate mechanism is saved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a cover mechanism, a battery and an electrical device. Background Art

[0002] In lithium-ion batteries, especially blade batteries, in the prior art, the cover plate and the pole ears of the pole are mostly connected by connecting sheets, and the pole on the cover plate and the rivet block are first riveted and then welded for fixed connection. There are many parts and the process is complicated, resulting in high cost. Utility Model Content

[0003] In view of this, the present application provides a cover mechanism, a battery and an electrical device, the purpose of which is to solve the above technical problems to a certain extent.

[0004] In a first aspect, the present application provides a cover mechanism, the cover mechanism is used for a battery, the battery has a length direction, and the cover mechanism includes:

[0005] A cover plate assembly, wherein the cover plate assembly has a first through hole penetrating the cover plate assembly along the length direction;

[0006] A pressure riveting component, the pressure riveting component is inserted into the first through hole, the pressure riveting component includes an annular recess, the outer edge of the hole of the cover plate assembly used to define the first through hole is embedded in the annular recess, and the pressure riveting component has a second through hole that penetrates the pressure riveting component along the length direction;

[0007] A connecting piece and a pole, wherein the connecting piece and the pole are an integrated structure, and the pole comprises a rod portion, and the rod portion is inserted into the second through hole.

[0008] Preferably, the pole further comprises:

[0009] a plate portion, wherein the rod portion is connected to one side of the plate portion in the length direction;

[0010] a convex portion connected to a side of the plate portion opposite to a side where the rod portion is located;

[0011] The plate portion and the convex portion together with the connecting piece form an integral structure.

[0012] Preferably, the connecting piece comprises:

[0013] a first sheet, the first sheet having a receiving portion, the receiving portion being used to receive the convex portion, so that the first sheet is in contact with the side of the plate portion where the convex portion is located;

[0014] A first melt portion, the first melt portion is located between the first sheet body and the plate portion, the first melt portion is also located between the protrusion and the receiving portion, and the first melt portion is configured so that the plate portion and the protrusion together form an integral structure with the connecting sheet.

[0015] Preferably, the connecting piece comprises:

[0016] A first sheet body, wherein the first sheet body is used to be connected to the pole, so that the connecting sheet and the pole form an integrated structure;

[0017] The second sheet is connected to the first sheet, and the second sheet is closer to the cover plate assembly than the first sheet in the length direction.

[0018] Preferably, the connecting sheet further includes a transition portion, the transition portion is located between the first sheet body and the second sheet body, the transition portion connects the first sheet body and the second sheet body, and an extension direction of the transition portion includes the length direction.

[0019] Preferably, the riveting component includes a guide portion, which is used to define an opening of the second through hole on a side close to the connecting piece, and the guide portion is inclined outward from the second through hole relative to the length direction, so that the open area of ​​the opening gradually increases from the side away from the connecting piece to the side close to the connecting piece.

[0020] Preferably, the rod portion is fixedly connected to the second through hole;

[0021] The riveting component includes a second melt portion, which is connected between the inner side of the second through hole and the rod portion, so that the rod portion and the riveting component form an integral structure, and the second melt portion is also configured to seal the gap formed between the rod portion and the inner side of the second through hole.

[0022] In a second aspect, the present application provides a battery, comprising the cover mechanism as described above.

[0023] Preferably, the battery also includes a pole group, the pole group includes a pole ear, the pole ear is configured to be bent to include a first bending portion extending along the length direction and a second bending portion intersecting the length direction, the second bending portion is connected to the side of the connecting plate facing the cover plate assembly.

[0024] In a third aspect, the present application provides an electrical device, wherein the electrical device comprises the battery as described above.

[0025] According to the cover plate mechanism provided by the present application, the cover plate assembly is installed and fixed by the riveting component through the engagement of the annular recess with the first through hole of the cover plate assembly, and since the connecting piece and the pole are an integral structure, the pole of the pole is inserted into the second through hole of the riveting component to complete the assembly of the riveting component, the pole and the connecting piece. Compared with the prior art method of first riveting the pole with the riveting block, the cover plate mechanism provided by the present application uses the riveting component to fix the cover plate assembly, and pre-forms the connecting piece and the pole into an integral structure, which reduces the number of parts in the assembly process and avoids the prior art process of first riveting the pole, thereby improving production efficiency and saving the cost of the cover plate mechanism and the battery used therein.

[0026] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a three-dimensional diagram of a cover mechanism provided according to an embodiment of the present application is shown.

[0029] Figure 2 A schematic diagram of a plan view of a cover mechanism provided according to an embodiment of the present application is shown.

[0030] Figure 3 Shows Figure 2 Schematic diagram of the cross-sectional view of section AA in FIG.

[0031] Figure 4 Shows Figure 3 Schematic diagram of the enlarged view at B in the figure.

[0032] Figure 5 A schematic diagram of a three-dimensional diagram of a pole group and a connecting piece of a cover plate mechanism provided according to an embodiment of the present application is shown.

[0033] Figure 6 A schematic diagram of a cross-sectional view of a pole group and a connecting piece of a cover plate mechanism provided according to an embodiment of the present application is shown.

[0034] Figure 7 A schematic diagram showing the relative positional relationship between the pole group and the connecting piece and the pole group of the cover plate mechanism provided according to an embodiment of the present application is shown.

[0035] Figure 8 A schematic diagram showing the internal structure of a battery provided according to an embodiment of the present application is shown.

[0036] Reference numerals:

[0037] 10-battery; 100-cover mechanism; 110-cover assembly; 111-first through hole; 120-rivet member; 121-annular recess; 122-second through hole; 123-guide portion; 130-connecting sheet; 131-first sheet body; 132-accommodating portion; 133-second sheet body; 134-transition portion; 140-pole; 141-rod; 142-plate; 143-convex portion; 200-pole group; 210-pole ear; L-length direction. DETAILED DESCRIPTION

[0038] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] According to a first aspect of an embodiment of the present application, a cover mechanism 100 is provided. Figures 1 to 8 The structure and working principle of the cover mechanism 100 are described in detail.

[0043] According to a first aspect of an embodiment of the present application, a cover mechanism 100 is provided. The cover mechanism 100 is used for a battery 10. The battery 10 has a length direction L. The cover mechanism 100 includes a cover assembly 110, a rivet member 120, a connecting piece 130, and a pole 140. In the embodiment, the cover assembly 110 has a first through hole 111 that penetrates the cover assembly 110 along the length direction L. The rivet member 120 is inserted into the first through hole 111. The rivet member 120 includes an annular recess 121. The outer edge of the hole of the cover assembly 110 that is used to define the first through hole 111 is embedded in the annular recess 121. The rivet member 120 has a second through hole 122 that penetrates the rivet member 120 along the length direction L. In the embodiment, the connecting piece 130 and the pole 140 are an integrated structure. The pole 140 includes a rod 141. The rod 141 is inserted into the second through hole 122.

[0044] Thus, according to the cover plate mechanism 100 provided in the embodiment of the present application, the riveting component 120 is engaged with the first through hole 111 of the cover plate assembly 110 through the annular recess 121, so as to install and fix the cover plate assembly 110, and since the connecting piece 130 and the pole 140 are an integral structure, the rod 141 of the pole 140 is inserted into the second through hole 122 of the riveting component 120, so as to complete the assembly of the riveting component 120 with the pole 140 and the connecting piece 130. Compared with the prior art method of first riveting the pole 140 with the riveting block, the cover plate mechanism 100 provided in the embodiment of the present application uses the riveting component 120 to fix the cover plate assembly 110, and at the same time, the connecting piece 130 and the pole 140 are pre-formed into an integral structure, which reduces the number of parts in the assembly process, and also avoids the prior art process of first riveting the pole 140, thereby improving the production efficiency and saving the cost of the cover plate mechanism 100 and the battery 10 used therein.

[0045] In an embodiment, the cover plate assembly 110 may include a plurality of components sequentially arranged in the length direction L of the battery 10. For example, the cover plate assembly 110 may include components such as plastic parts and cover plate members sequentially arranged along the length direction L. More specifically, the plurality of components sequentially arranged along the length direction L may all have through holes corresponding to positions, and these through holes form the second through hole 122 of the cover plate assembly 110 after the aforementioned plurality of components are stacked together. Thus, when the riveting component 120 is inserted into the second through hole 122, the riveting component 120 is equivalent to being sequentially inserted through the aforementioned plurality of components.

[0046] In an embodiment, Figure 4As shown, the annular recess 121 of the riveting component 120 is substantially formed by two flanges spaced apart in the length direction L. Specifically, in combination with Figure 2 The flange located on the outer side of the cover plate assembly 110 in the length direction L (that is, the side of the cover plate assembly 110 facing away from the pole group 200) can be formed into a roughly rectangular shape, and the flange located on the inner side of the cover plate assembly 110 in the length direction L (that is, the side of the cover plate assembly 110 facing the pole group 200) can be formed into a sheet structure such as a rectangle or a circle.

[0047] In the embodiment, the riveting member 120 can be riveted in the first through hole 111 under pressure, for example, to form an interference fit with the first through hole 111 to fix the cover plate assembly 110. In other words, on the one hand, the penetration portion between the two flanges of the riveting member 120 is interference fit with the first through hole 111, and on the other hand, the two flanges can also respectively press the side surfaces of the cover plate assembly 110 where they are located.

[0048] In the embodiment, as mentioned in the above description, the connecting piece 130 and the pole 140 are formed into an integral structure, so that the two can be pre-assembled before the cover mechanism 100 is assembled. Therefore, the "connecting piece 130 and the pole 140 are formed into an integral structure" here should be understood to include the following meanings: before assembling the cover mechanism 100, the connecting piece 130 and the pole 140 are constructed as a part that can be transported and assembled by molding or mechanical connection, and the part is usually not separated into the connecting piece 130 and the pole 140, unless the assembler performs an operation such as cutting on the part in which he subjectively expects to separate the connecting piece 130 and the pole 140 into two parts.

[0049] As an example, in an embodiment, the connecting piece 130 and the pole 140 can be an integral structure obtained by machining the same metal, such as copper or aluminum. In other examples, the two can be produced separately and then connected by mechanical connection methods such as welding, which will be further explained in the subsequent description.

[0050] According to the cover plate mechanism 100 provided in the embodiment of the present application, the pole 140 may further include a plate portion 142 and a convex portion 143. In the embodiment, the rod portion 141 may be connected to one side of the plate portion 142 in the length direction L, and the convex portion 143 may be connected to the side of the plate portion 142 opposite to the side where the rod portion 141 is located. In the embodiment, the plate portion 142 and the convex portion 143 together form an integral structure with the connecting piece 130.

[0051] See also Figure 5 and Figure 6Thus, according to the cover mechanism 100 provided in the embodiment of the present application, the rod portion 141 and the convex portion 143 are substantially respectively arranged on both sides of the plate portion 142 in the length direction L. Due to the existence of the plate portion 142, the connection position of the plate portion 142 and the rod portion 141 forms a structure similar to a "shoulder" due to the difference in cross-sectional areas between the two. This structure is conducive to limiting the position of the pole 140 relative to the riveting component 120 by abutting against the riveting component 120 after the rod portion 141 is inserted into the second through hole 122. On the other hand, the plate portion 142 is used to connect with the connecting piece 130, which is conducive to providing a larger contact area to improve the reliability of the connection between the connecting piece 130 and the pole 140.

[0052] In an embodiment, as an example, the rod portion 141 can be formed into a roughly cylindrical structure, and the plate portion 142 can be formed into a circular plate structure with a larger diameter, and the two can be coaxially arranged, as an example, the axis extends along the length direction L.

[0053] In the embodiment, the protrusion 143 protrudes from the side of the plate portion 142 facing away from the rod portion 141, and its function is to cooperate with the plate portion 142 to form an integral structure with the connecting piece 130. In the embodiment, since the protrusion 143 protrudes from one side of the plate portion 142, it further increases the surface area of ​​this side of the plate portion 142, and the connection between the protrusion 143 and this side of the plate portion 142 and the connecting piece 130 is conducive to further increasing the reliability of such connection.

[0054] As an example, in the embodiment, the convex portion 143 can be formed as a circular sheet-shaped convex portion 143, and the sheet-shaped convex portion 143 can be coaxial with the plate portion 142 as above, so as to facilitate processing. In addition, in the embodiment, as an example, the diameter of the convex portion 143 can also be smaller than the diameter of the plate portion 142, so the connection position of the convex portion 143 and the plate portion 142 also substantially forms the above-mentioned "shaft shoulder", and the role of the "shaft shoulder" will be explained in the subsequent description.

[0055] According to the cover plate mechanism 100 provided in the embodiment of the present application, the connecting plate 130 may include a first plate body 131 and a first melting portion. In the embodiment, the first plate body 131 may have a receiving portion 132, and the receiving portion 132 may be used to receive the protrusion 143, so that the first plate body 131 is in contact with the side of the plate portion 142 where the protrusion 143 is located. In the embodiment, as Figure 6 As shown, Figure 6 The schematic diagram shows a cross-sectional view obtained by cutting the integral structure formed by the connecting piece 130 and the pole 140 with a plane passing through the axis of the rod 141. The matching relationship between the receiving portion 132 and the protrusion 143 is given in detail in the schematic diagram, which will be described in detail below.

[0056] Specifically, in the embodiment, the accommodating portion 132 can be formed as a groove opened on the side of the first sheet 131 facing the pole 140, and the groove can be used to receive the convex portion 143 of the pole 140, and the depth of the groove is to completely accommodate the convex portion 143, so that the shoulder between the plate portion 142 and the convex portion 143 plays a role, that is, the shoulder abuts against the side of the first sheet 131 facing the pole 140, and the plate portion 142 fits the first sheet 131. Figure 6 In the example given in , the accommodating portion 132 can also be formed as a through hole, which is easier to process. Since the through hole passes through the first sheet 131, even if the thickness of the first sheet 131 makes the depth of the through hole insufficient to completely accommodate the protrusion 143, the protrusion 143 can be partially exposed on the side of the first sheet 131 facing away from the plate portion 142, so that the plate portion 142 fits the first sheet 131.

[0057] In an embodiment, as described above, the connecting piece 130 may further include a first melt portion, which may be located between the first sheet body 131 and the plate portion 142, and the first melt portion may also be located between the protrusion 143 and the accommodating portion 132. The first melt portion may be configured such that the plate portion 142 and the protrusion 143 together form an integral structure with the connecting piece 130.

[0058] Here, "melt portion" means that it is formed after the metal is melted, and this melt portion can be obtained by welding. In other words, after the protrusion 143 of the pole 140 is inserted into the receiving portion 132 of the first sheet 131, the plate portion 142 and the first sheet 131, as well as the protrusion 143 and the receiving portion 132 can be connected by welding. For example, welding is performed on the outer edge of the plate portion 142, and on the side of the first sheet 131 facing away from the plate portion 142, the exposed protrusion 143 and the unsealing of the receiving portion 132 are welded.

[0059] According to the cover mechanism 100 provided in the embodiment of the present application, the connecting piece 130 may further include a second piece 133 , which may be connected to the first piece 131 , and the second piece 133 may be closer to the cover assembly 110 in the length direction L relative to the first piece 131 .

[0060] In the embodiment, the second sheet 133 provides an area for the connecting sheet 130 to connect with the tab 210 through the relative position relationship with the first sheet 131 as described above. That is, in the embodiment, Figure 7 As shown, the tab 210 is connected to the second sheet 133 , that is, the side of the second sheet 133 facing the cover plate assembly 110 .

[0061] According to the cover mechanism 100 provided in the embodiment of the present application, the connecting piece 130 may further include a transition portion 134. The transition portion 134 may be located between the first sheet 131 and the second sheet 133. The transition portion 134 may connect the first sheet 131 and the second sheet 133. The extension direction of the transition portion 134 includes the length direction L.

[0062] In an embodiment, the provision of the transition portion 134 allows the transition portion 134 to be used to obtain different distances between the first sheet 131 and the second sheet 133 in a direction perpendicular to the length direction L. As an example, in this embodiment, the extension direction of the transition portion 134 includes the length direction L, which means that the transition portion 134 extends along the length direction L, that is, the distance between the first sheet 131 and the second sheet 133 in a direction perpendicular to the length direction L is the thickness of the transition portion 134 in this direction.

[0063] In the embodiment, as an example, in combination with Figure 5 , the first sheet 131 , the transition portion 134 and the second sheet 133 may all be formed into a substantially rectangular plate-like structure.

[0064] According to the cover mechanism 100 provided in the embodiment of the present application, the riveted component 120 may further include a guide portion 123, which may be used to define an opening of the second through hole 122 on the side close to the connecting piece 130. The guide portion 123 extends outward from the second through hole 122 relative to the length direction L, so that the open area of ​​the opening gradually increases from the side away from the connecting piece 130 to the side close to the connecting piece 130.

[0065] In this way, according to the cover mechanism 100 provided in the embodiment of the present application, through the above-mentioned guide portion 123, the rod portion 141 of the pole 140 can move into the opening through the guidance of the guide portion 123 when abutting against the guide portion 123, and then be more easily inserted into the second through hole 122, thereby helping to improve assembly efficiency.

[0066] In the embodiment, as an example, the guide portion 123 may be a rounded structure opened at the edge of the opening, or may be a chamfered structure opened at the edge of the opening.

[0067] According to the cover mechanism 100 provided in the embodiment of the present application, the rod portion 141 can be fixedly connected to the second through hole 122. In the embodiment, the riveting component 120 can include a second melt portion, which can be connected between the inner side of the second through hole 122 and the rod portion 141, so that the rod portion 141 and the riveting component 120 form an integral structure, and the second melt portion is also configured to seal the gap formed between the rod portion 141 and the inner side of the second through hole 122.

[0068] In an embodiment, the second melt portion is formed in the same manner as the first melt portion above, such as Figure 8 As shown, Figure 8 The structure of the battery 10 is shown, and the assembly state after the rod portion 141 of the pole 140 is inserted into the first through hole 111 is also shown. In this assembly state, the joint between the riveted component 120 and the rod portion 141 can be welded on the side of the riveted component 120 facing away from the cover plate assembly 110 to form a second melt portion. In this way, the second melt portion can not only realize the fixed connection between the pole 140 and the riveted component 120, but also enable the two to achieve electrical connection, and can also seal the joint between the two to play a sealing role.

[0069] According to a second aspect of the embodiment of the present application, a battery 10 is provided. The battery 10 may include the cover mechanism 100 as described above. The battery 10 also includes the above beneficial effects, which will not be described in detail here. In addition, the battery 10 also includes a shell having openings on both sides. As an example, see Figure 8 The structure of the battery 10, in Figure 8 In the example given, the battery 10 may be, for example, a blade battery 10, Figure 8 The longitudinal direction L is also shown.

[0070] In an embodiment, the battery 10 may include two cover mechanisms 100 to respectively cover the openings on both sides of the shell in the length direction L, and the battery 10 may further include an electrode group 200, which is located in the shell.

[0071] According to the battery 10 provided in the embodiment of the present application, the electrode group 200 may include a pole ear 210, and the pole ear 210 may be configured to be bent to include a first bending portion extending along the length direction L and a second bending portion intersecting the length direction L, and the second bending portion is connected to the side of the connecting plate 130 facing the cover plate assembly 110.

[0072] See here Figure 7 , Figure 7 An example of the bending manner of the tab 210 is given above. In the embodiment, the tab 210 is bent in an "L" shape, that is, the first bending portion and the second bending portion may be vertical or approximately vertical. Figure 7 Due to the perspective, only the second bent portion of the tab 210 connected to the outer side of the second sheet 133 of the connecting sheet 130 is shown, and the grid-like structure schematically represents the welding mark of the tab 210 welded to the second sheet 133. The tab 210 extended in this way can occupy less internal space of the battery 10, increase the energy density of the battery 10, and reduce the difficulty of bending the tab 210.

[0073] According to the third aspect of the embodiment of the present application, an electric device is provided, the electric device includes the battery 10 as described above, and also includes the above beneficial effects, which will not be repeated here. In the embodiment, the electric device can be, for example, a vehicle, and the above battery 10 can be used as at least a partial power source of the vehicle to drive the vehicle. When the battery 10 is completely used as a power source to drive the vehicle, the vehicle can be a pure electric vehicle. When the battery 10 is partially used as a power source to drive the vehicle, another part of the power of the vehicle can also be provided by an internal combustion engine. In this case, the vehicle is a hybrid vehicle.

[0074] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. All equivalent structural changes made by using the contents of the present application specification and drawings under the innovative concept of the present application, or directly / indirectly applied in other related technical fields are included in the protection scope of the present application.

Claims

1. A cover mechanism, characterized in that: The cover mechanism is used for a battery, the battery has a length direction, and the cover mechanism comprises: A cover plate assembly, wherein the cover plate assembly has a first through hole penetrating the cover plate assembly along the length direction; A pressure riveting component, the pressure riveting component is inserted into the first through hole, the pressure riveting component includes an annular recess, the outer edge of the hole of the cover plate assembly used to define the first through hole is embedded in the annular recess, and the pressure riveting component has a second through hole that penetrates the pressure riveting component along the length direction; A connecting piece and a pole, wherein the connecting piece and the pole are an integrated structure, and the pole comprises a rod portion, and the rod portion is inserted into the second through hole.

2. The cover mechanism according to claim 1, characterized in that: The pole also includes: a plate portion, wherein the rod portion is connected to one side of the plate portion in the length direction; a convex portion connected to a side of the plate portion opposite to a side where the rod portion is located; The plate portion and the convex portion together with the connecting piece form an integral structure.

3. The cover mechanism according to claim 2, characterized in that: The connecting piece comprises: a first sheet, the first sheet having a receiving portion, the receiving portion being used to receive the convex portion, so that the first sheet is in contact with the side of the plate portion where the convex portion is located; A first melt portion, the first melt portion is located between the first sheet body and the plate portion, the first melt portion is also located between the protrusion and the receiving portion, and the first melt portion is configured so that the plate portion and the protrusion together form an integral structure with the connecting sheet.

4. The cover mechanism according to claim 1, characterized in that: The connecting piece comprises: A first sheet body, wherein the first sheet body is used to be connected to the pole, so that the connecting sheet and the pole form an integrated structure; The second sheet is connected to the first sheet, and the second sheet is closer to the cover plate assembly than the first sheet in the length direction.

5. The cover mechanism according to claim 4, characterized in that: The connecting sheet further includes a transition portion, the transition portion is located between the first sheet body and the second sheet body, the transition portion connects the first sheet body and the second sheet body, and an extending direction of the transition portion includes the length direction.

6. The cover mechanism according to claim 1, characterized in that: The riveting component includes a guide portion, which is used to define an opening of the second through hole on a side close to the connecting piece. The guide portion is inclined outward from the second through hole relative to the length direction, so that the open area of ​​the opening gradually increases from the side away from the connecting piece to the side close to the connecting piece.

7. The cover mechanism according to claim 1, characterized in that: The rod portion is fixedly connected to the second through hole; The riveting component includes a second melt portion, which is connected between the inner side of the second through hole and the rod portion, so that the rod portion and the riveting component form an integral structure, and the second melt portion is also configured to seal the gap formed between the rod portion and the inner side of the second through hole.

8. A battery, characterized in that: The battery comprises the cover mechanism according to any one of claims 1 to 7.

9. The battery according to claim 8, characterized in that The battery also includes a pole group, which includes a pole ear, and the pole ear is configured to be bent to include a first bending portion extending along the length direction and a second bending portion intersecting the length direction, and the second bending portion is connected to the side of the connecting plate facing the cover plate assembly.

10. An electrical device, characterized in that: The electrical device comprises the battery as claimed in claim 8 or 9.

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