Cover plate assembly, single battery and battery

Abstract

The utility model provides a cover plate assembly, a single battery and a battery, the cover plate assembly comprises: a cover plate body, which is provided with a first mounting through hole; the pole penetrates through the first mounting through hole and is connected with the cover plate body; and the connecting sheet is arranged on one surface, facing the shell, of the cover plate body, and a convex structure is arranged on one side, connected with the pole, of the connecting sheet and is matched with the groove in the bottom of the pole. The convex structure matched with the groove in the bottom surface of the pole is arranged on one surface, facing the cover plate body, of the connecting sheet, so that the convex structure is embedded into the groove in the bottom surface of the pole and is welded and fixed during mounting, the connecting sheet and the pole are more adaptive and are more reliably connected, and the connecting sheet is designed to be rectangular, so that the connecting sheet is more convenient to mount and dismount. The length of the connecting piece extends along the width direction of the cover plate body, and the connecting piece is provided with the tab welding areas at the two sides of the convex structure, so that the center distance of tabs is basically the same as the center distance of poles, the length of the connecting piece is effectively shortened, and the cost and the weight are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery cells, and particularly relates to a cover plate assembly, a single battery and a battery. Background Art

[0002] Lithium-ion batteries or sodium-ion batteries have the advantages of light weight, large energy storage, high power, no pollution, long life, small self-discharge coefficient, wide temperature adaptation range, etc., and are widely used in energy storage systems in new energy vehicles. In existing batteries, the tabs of the electrode group are usually first welded to the connecting piece, and then the connecting piece is welded to the pole column of the battery cover plate, so as to realize the electrical connection between the electrode group and the pole column and the transmission of electrical energy within the electrode group. The connection between the existing connecting piece and the pole column is mostly a planar connection. When there are grooves at the bottom of some pole columns, there will be a large hollow space when directly connecting with the existing connecting piece, which is likely to cause unreliable connection. Moreover, the center distance between the tabs and the center distance between the pole columns in existing batteries are basically not equal, and the distance between the tabs and the pole columns is relatively large, resulting in a relatively long connecting piece for connecting the pole column and the tab, leading to high cost and high weight. Summary of the Utility Model

[0003] In view of the above disadvantages of the prior art, the purpose of the present utility model is to provide a cover plate assembly, a single battery and a battery, so as to improve the problem that when there are grooves at the bottom of the existing pole column, there will be a large hollow space when the connecting piece is connected to it, which is likely to cause unreliable connection, and the center distance between the tabs and the center distance between the pole columns in existing batteries are basically not equal, and the distance between the tabs and the pole columns is relatively large, resulting in a relatively long connecting piece for connecting the pole column and the tab, leading to high cost and high weight.

[0004] To achieve the above purpose and other related purposes, the present utility model provides a cover plate assembly, including:

[0005] A cover plate body for connecting with a housing, and a first installation through hole is formed on the cover plate body;

[0006] A pole column, the pole column passes through the first installation through hole and is connected to the cover plate body;

[0007] A connecting piece, the connecting piece is arranged on the side of the cover plate body facing the housing, and a convex structure is arranged on the side of the connecting piece connected to the pole column, and the convex structure is adapted to the groove at the bottom of the pole column.

[0008] In an embodiment of the present utility model, a back groove is further formed on the bottom surface of the connecting piece, and the back groove corresponds to the convex structure.

[0009] In an embodiment of the present utility model, the cross sections of the back groove and the convex structure are circular.

[0010] In an embodiment of the present utility model, the connecting piece further includes tab welding areas which are distributed on both sides of the protruding structure, and the tab is fixedly welded to a surface of the tab welding area facing away from the pole column.

[0011] In an embodiment of the present utility model, the protruding direction of the protruding structure is perpendicular to the plane where the tab welding area is located.

[0012] In an embodiment of the present utility model, the connecting piece is of a rectangular structure, and the length direction of the connecting piece extends along the thickness direction of the cover plate body.

[0013] In an embodiment of the present utility model, a chamfer structure is provided at a corner of the rectangular structure.

[0014] In an embodiment of the present utility model, the protruding structure is arranged at the center position of the rectangular structure, and the tab welding areas are symmetrically distributed along the length direction on both sides of the protruding structure.

[0015] The present utility model further provides a single cell, including:

[0016] A housing having an opening;

[0017] An electrode assembly installed in the housing, the electrode assembly including tabs;

[0018] The cover plate assembly as described in any one of the above embodiments, the cover plate assembly is located at the opening and fixedly connected to the housing, and the connecting piece in the cover plate assembly is fixedly welded to the tab.

[0019] The present utility model further provides a battery including at least one single cell as described in the above embodiments.

[0020] The present utility model provides a cover plate assembly, a single cell and a battery. By providing a protruding structure on a surface of the connecting piece facing the cover plate body that matches the groove on the bottom surface of the pole column, during installation, the protruding structure is embedded into the groove on the bottom surface of the pole column and fixedly welded, so that the connecting piece and the pole column are more adaptable and the connection is more reliable; also by designing the connecting piece as a rectangle, its length extends along the width direction of the cover plate body, and at the same time, tab welding areas are provided on both sides of the protruding structure, and the tabs are connected to the tab welding areas, so that the center distance between the tabs is basically the same as the center distance between the pole columns, effectively shortening the length of the connecting piece, reducing costs and weight. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the description of the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic structural diagram of a single battery in an embodiment of the present utility model.

[0023] Figure 2 This is a schematic structural diagram of a connecting piece in an embodiment of the present utility model.

[0024] Figure 3 This is a schematic cross-sectional structural diagram of a connecting piece in an embodiment of the present utility model.

[0025] Figure 4 This is a schematic structural diagram of a housing in an embodiment of the present utility model.

[0026] Label description:

[0027] 10. Cover plate assembly; 11. Cover plate body; 12. Terminal post; 13. Connecting piece; 131. Protrusion structure; 132. Back groove; 133. Ear welding area; 134. Chamfer structure; 20. Housing; 201. Opening; 100. Single battery. Specific embodiments

[0028] The following uses specific specific examples to illustrate the embodiments of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0029] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present utility model. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0030] Please refer to Figures 1 to 4As shown in the figure, the present utility model proposes a cover plate assembly, a single cell and a battery to improve the problem that when there is a groove on the bottom surface of the existing pole column, there will be a large hollow space when the connecting piece is connected to it, which is likely to cause unreliable connection. Moreover, the center distance between the pole ears in the existing battery is basically not equal to the center distance of the pole column, and the distance between the pole ear and the pole column is relatively large, resulting in a relatively long connecting piece for connecting the pole column and the pole ear, leading to high cost and high weight. Specifically, the cover plate assembly 10 includes a cover plate body 11, a pole column 12 and a connecting piece 13. The cover plate body 11 is used to connect with the housing 20 of the single cell 100. A first installation through hole is provided on the cover plate body 11. The pole column 12 passes through the first installation through hole and is connected to the cover plate body 11. The connecting piece 13 is arranged on the side of the cover plate body 11 facing the housing 20, and the connecting piece 13 is fixedly welded to the pole column 12.

[0031] Please refer to Figures 1 to 3 As shown in the figure, in this embodiment, a convex structure 131 is provided on the surface of the connecting piece 13 connected to the pole column 12. Correspondingly, a groove structure is provided on the bottom surface of the pole column 12. The convex structure 131 is adapted to the groove structure on the bottom surface of the pole column 12. During installation, the convex structure 131 is embedded into the groove on the bottom surface of the pole column 12 and fixedly welded, so that the connecting piece 13 and the pole column 12 are more adapted and the connection is more reliable. In this embodiment, a back groove 132 is further formed on the bottom surface of the connecting piece 13. The back groove 132 corresponds to the convex structure 131. The design of the back groove 132 can effectively reduce the thickness and weight of the connecting piece 13. It can be understood that the cross-sections of the back groove 132 and the convex structure 131 are circular to facilitate the connection between the connecting piece 13 and the pole column 12. Of course, in some other embodiments, the cross-sections of the back groove 132 and the convex structure 131 can also be set to other shapes.

[0032] Please refer to Figures 1 to 3 As shown in the figure, in this embodiment, the connecting piece 13 further includes a pole ear welding area 133. The pole ear welding areas 133 are distributed on both sides of the convex structure 131, and the pole ear is fixedly welded to the side of the pole ear welding area 133 facing away from the pole column 12. In this embodiment, the protruding direction of the convex structure 131 is perpendicular to the plane where the pole ear welding area 133 is located, so that after the convex structure 131 is embedded into the groove on the bottom surface of the pole column 12 and fixedly welded to the pole column 12, the heights of the pole ear welding areas 133 on both sides of the pole column 12 from the pole ear are basically the same, facilitating the connection and fixation between the pole ear and the connecting piece 13.

[0033] Please refer to Figures 1 to 3As shown, in this embodiment, the connecting piece 13 has a rectangular structure. The length direction of the connecting piece 13 extends along the thickness direction of the cover plate body 11. The convex structure 131 is arranged at the center of the rectangular structure, and the tab welding areas 133 are symmetrically arranged on both sides of the convex structure 131 along the length direction of the rectangular structure. Thus, when the tabs are welded and fixed to the tab welding areas 133, the distances between the tabs on both sides of the convex structure 131 and the pole column 12 are basically the same, effectively reducing the power transmission path between the tabs and the pole column 12. At the same time, the connecting piece 13 is designed to be rectangular, and its length extends along the width direction of the cover plate body 11. At the same time, tab welding areas 133 are provided on both sides of the convex structure 131 on the connecting piece 13, and the tabs are connected to the tab welding areas 133, making the center distance between the positive and negative tabs on both sides of the single cell 100 basically the same as the center distance between the positive and negative pole columns, effectively shortening the length of the connecting piece, reducing costs and weight at the same time. At the same time, the connecting piece 13 is an integral structure, solving the problem of the design of the integral connecting piece when the center distance of the tabs is equal to or approximately equal to the center distance of the pole columns.

[0034] Please refer to Figures 1 to 3 As shown, in this embodiment, a chamfer structure 134 is provided at a corner of the connecting piece 13 designed to be a rectangular structure. The chamfer structure 134 can play a role in direction discrimination and positioning when the connecting piece 13 is connected and installed to the cover plate body 11 and the pole column 12, facilitating the installation and use of the connecting piece 13. Of course, in other embodiments, other identification structures or markings can also be designed on the connecting piece 13 for direction discrimination and positioning.

[0035] Please refer to Figures 1 to 4 As shown, the present utility model also proposes a single cell 100, which includes a housing 20, an electrode assembly, and a cover plate assembly 10. The electrode assembly is installed in the accommodation cavity formed by the housing 20. The electrode assembly includes tabs. The housing 20 has an opening 201. The cover plate assembly 10 is installed at the opening 201 and is fixedly connected to the housing 20. The connecting piece 13 in the cover plate assembly 10 is welded and fixed to the tabs. It can be understood that the cover plate assembly 10 has the same or similar structure as the cover plate assembly 10 described in the above embodiment. To avoid repetition, it will not be elaborated here. It should be noted that in this application, the single cell 100 can include a lithium-ion secondary single cell 100, a lithium-ion primary single cell 100, a lithium-sulfur single cell 100, a sodium-lithium-ion single cell 100, a sodium-ion single cell 100, or a magnesium-ion single cell 100, etc. The embodiments of this application are not limited thereto.

[0036] Please refer to Figures 1 to 4As shown in the figure, this embodiment also provides a battery, which includes at least one single battery as described in the above embodiment. It should be noted that the battery mentioned in the embodiments of this application refers to a single physical module that includes one or more single batteries to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc. Generally, a battery includes a housing for encapsulating one or more single batteries. The housing can prevent liquids or other foreign objects from affecting the charging or discharging of the single battery. For example, the battery can be a battery module formed by connecting multiple single batteries in series, in parallel, or in a combination of series and parallel; or it can be a battery pack assembled from multiple such battery modules, or directly formed by combining the single batteries into a battery pack and a battery module.

[0037] The present utility model proposes a cover plate assembly, a single battery and a battery. By providing a convex structure on the surface of the connecting piece facing the cover plate body that matches the groove on the bottom surface of the pole column, during installation, the convex structure is embedded into the groove on the bottom surface of the pole column and welded and fixed, so that the connecting piece and the pole column are more adapted and the connection is more reliable; also, by designing the connecting piece as a rectangle, its length extends along the width direction of the cover plate body, and at the same time, pole ear welding areas are provided on both sides of the convex structure, and the pole ears are connected to the pole ear welding areas, so that the center distance between the pole ears is basically the same as the center distance between the pole columns, effectively shortening the length of the connecting piece, reducing costs and weight.

[0038] The above-described embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be included within the protection scope of the present utility model.

[0039] Except for the technical features described in the specification, the remaining technical features are known to those skilled in the art. To highlight the innovative features of the present utility model, the remaining technical features are not described herein again.

Claims

1. A cover plate assembly, characterized in that: include: The cover body is used to be connected with the housing, and a first mounting through hole is formed on the cover body; A pole, the pole is passed through the first mounting through hole and connected to the cover plate body; A connecting piece is arranged on a side of the cover body facing the shell, a protruding structure is arranged on the side of the connecting piece connected to the pole, and the protruding structure is matched with the groove at the bottom of the pole.

2. The cover plate assembly according to claim 1, characterized in that: A back groove is also formed on the bottom surface of the connecting piece, and the back groove corresponds to the protruding structure.

3. The cover plate assembly according to claim 2, characterized in that: The cross sections of the back groove and the protruding structure are circular.

4. The cover plate assembly according to claim 1, characterized in that: The connecting piece further comprises a pole lug welding area, the pole lug welding area is distributed on both sides of the protruding structure, and the pole lug is welded and fixed to a side of the pole lug welding area away from the pole column.

5. The cover plate assembly according to claim 4, characterized in that: The protruding direction of the protruding structure is perpendicular to the plane where the tab welding area is located.

6. The cover plate assembly according to claim 4, characterized in that: The connecting piece is a rectangular structure, and the length direction of the connecting piece is extended along the thickness direction of the cover plate body.

7. The cover plate assembly according to claim 6, characterized in that: A chamfered structure is arranged at a corner of the rectangular structure.

8. The cover plate assembly according to claim 6, characterized in that: The protruding structure is arranged at the center of the rectangular structure, and the tab welding areas are symmetrically distributed on both sides of the protruding structure along the length direction.

9. A single cell battery, characterized in that: include: a housing having an opening; An electrode assembly, the electrode assembly being installed in the housing, the electrode assembly comprising a tab; The cover plate assembly according to any one of claims 1 to 8, wherein the cover plate assembly is located at the opening and is fixedly connected to the shell, and the connecting piece in the cover plate assembly is fixedly welded to the pole ear.

10. A battery, characterized in that: The invention comprises at least one single battery cell as claimed in claim 9.

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