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; the connecting piece is arranged on one side, facing the shell, of the cover plate body, the connecting piece comprises a pole welding area and tab welding areas located on two sides of the pole welding area, the tab welding areas are bent and protruded towards one side, deviating from the cover plate body, relative to the pole welding area, and the tabs are connected to one side, facing the cover plate body, of the tab welding areas. According to the utility model, the tab welding area of the connecting piece is bent and protruded relative to one side, deviating from the cover plate body, of the pole column welding area, and the tab is welded and fixed with one side, facing the cover plate body, of the tab welding area after being turned over, so that the connecting piece can play a role in supporting the tab, the sagging risk of the tab is effectively reduced, and the service life of the tab is prolonged. And the connection reliability between the tab and the connecting sheet is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric cores, and specifically relates to a cover plate assembly, a single cell 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, and wide temperature adaptability. They are widely used in energy storage systems in new energy vehicles. In existing batteries, the pole ears of the electrode group are usually welded to the connecting pieces first, and then the connecting pieces are welded to the poles of the battery cover, so as to achieve electrical connection between the electrode group and the poles, and realize the transmission of electrical energy within the electrode group. When the existing connecting pieces are connected to the pole ears, the pole ears are generally bent and connected to the bottom surface of the connecting pieces. There is a risk of sagging under the long-term bending state and the action of gravity, which may cause unreliable connection between the pole ears and the connecting pieces, and even cause a short circuit to be formed when the pole ears are inserted, thereby affecting the transmission of electrical energy. Utility Model Content

[0003] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a cover plate assembly, a single cell and a battery, so as to improve the problem that when the existing connecting piece is connected to the pole ear, the pole ear is generally bent and connected to the bottom surface of the connecting piece, and there is a risk of sagging under the bending state for a long time and the action of gravity, which may cause unreliable connection between the pole ear and the connecting piece, and even cause a short circuit to be formed by the insertion of the pole ear, thereby affecting the transmission of electric energy.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a cover plate assembly, comprising:

[0005] The cover body is used to be connected with the housing, and a first mounting through hole is formed on the cover body;

[0006] A pole, the pole is passed through the first mounting through hole and connected to the cover plate body;

[0007] A connecting piece, wherein the connecting piece is arranged on a side of the cover body facing the shell, the connecting piece includes a pole welding area and a pole lug welding area located on both sides of the pole welding area, the pole lug welding area is bent and protruded relative to the pole welding area toward a side away from the cover body, and the pole lug is connected to a side of the pole lug welding area facing the cover body.

[0008] In an embodiment of the present invention, the tab welding area and the pole welding area are connected via a transition section.

[0009] In one embodiment of the present utility model, the transition section is an arc section or the transition section is a straight section, and an angle greater than 90 degrees is formed between the straight section and the tab welding area or the terminal welding area.

[0010] In one embodiment of the present utility model, the terminal welding area, the tab welding area and the transition section are of an integrally formed structure.

[0011] In one embodiment of the present utility model, the two tab welding areas on both sides of the terminal welding area are located on the same plane.

[0012] In one embodiment of the present utility model, a knurled structure is provided on the surface of the terminal welding area facing away from the cover body.

[0013] In one embodiment of the present utility model, the connecting piece is of a rectangular structure, the length direction of the connecting piece extends along the thickness direction of the cover body, and the tab welding areas are symmetrically distributed on both sides of the terminal welding area along the length direction.

[0014] In one embodiment of the present utility model, a chamfer structure is provided at one corner of the rectangular structure.

[0015] The present utility model also provides a single cell, comprising:

[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 also 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 bending and protruding the tab welding area of the connecting piece relative to the terminal welding area toward the side away from the cover body, folding the tab and fixedly welding it to the surface of the tab welding area facing the cover body, the connecting piece can support the tab, effectively reducing the risk of tab sagging and ensuring the connection reliability between the tab and the connecting piece. Also, by designing the connecting piece as a rectangle with its length extending along the width direction of the cover body and arranging tab welding areas on both sides of the terminal welding area, and connecting the tab to the tab welding area, the center distance between the tabs is basically the same as the center distance between the terminals, effectively shortening the length of the connecting piece, reducing costs and weight. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 It is a schematic structural diagram of a single battery in an embodiment of the present invention.

[0023] Figure 2 It is a schematic structural diagram of a connecting piece in an embodiment of the present invention.

[0024] Figure 3 It is a schematic connection diagram of a connecting piece and a pole column in an embodiment of the present invention.

[0025] Figure 4 It is a schematic cross-sectional structural diagram of a connecting piece in an embodiment of the present invention.

[0026] Figure 5 It is a schematic structural diagram of a housing in an embodiment of the present invention.

[0027] Reference numeral description:

[0028] 10. Cover assembly; 11. Cover body; 12. Pole column; 13. Connecting piece; 131. Pole column welding area; 132. Tab welding area; 133. Transition section; 134. Chamfer structure; 20. Housing; 201. Opening; 100. Single battery. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. 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 invention.

[0030] It should be noted that the drawings provided in this embodiment only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0031] Please refer to Figures 1 to 5As shown, the utility model proposes a cover plate assembly, a single cell and a battery to improve the problem that when the existing connecting piece is connected to the pole ear, the pole ear is generally bent and connected to the bottom surface of the connecting piece. There is a risk of sagging under the bending state for a long time and under the action of gravity, which may cause unreliable connection between the pole ear and the connecting piece, and even cause the pole ear to be inserted into the short circuit, thereby affecting the problem of power transmission. Specifically, the cover plate assembly 10 includes a cover plate body 11, a pole 12 and a connecting piece 13. The cover plate body 11 is used to connect with the shell 20 of the single cell 100. There is a first mounting through hole on the cover plate body 11. The pole 12 is penetrated through the first mounting through hole and connected to the cover plate body 11. The connecting piece 13 is arranged on the side of the cover plate body 11 facing the shell 20, and the connecting piece 13 is welded and fixed to the pole 12.

[0032] See also Figures 2 to 4 As shown, in this embodiment, the connecting piece 13 includes a pole welding area 131 and a tab welding area 132. The tab welding area 132 is located on both sides of the pole welding area 131. The pole welding area 131 is used to be welded and fixed to the pole 12, and the tab welding area 132 is used to be welded and fixed to the tab of the electrode assembly. In this embodiment, the pole lug welding area 132 is bent and protruded relative to the pole welding area 131 toward the side away from the cover body 11. For example, the side of the connecting piece 13 facing the cover body 11 is defined as the upper surface, and the side away from the cover body 11 is defined as the lower surface. The distance between the upper surface of the pole lug welding area 132 and the cover body 11 is greater than the distance between the upper surface of the pole welding area 131 and the cover body 11, so that when the connecting piece 13 is welded and fixed to the pole 12, there is a sufficient gap between the pole lug welding area 132 and the cover body 11, so as to facilitate accommodating the folded pole lug, so that the pole lug can be welded and fixed to the side of the pole lug welding area 132 facing the cover body 11, that is, the upper surface of the pole lug welding area 132, so that the pole lug welding area 132 of the connecting piece 13 also plays a role in supporting the pole lug, effectively reducing the risk of the pole lug sagging, and ensuring the connection reliability between the pole lug and the connecting piece 13.

[0033] See also Figures 2 to 4As shown, in this embodiment, the connecting piece 13 is arranged in a rectangular structure. Among them, the tab welding area 132 and the terminal welding area 131 are located on different planes. The length direction of the rectangular connecting piece 13 extends along the thickness direction of the cover body 11. The tab welding areas 132 are symmetrically distributed on both sides of the terminal welding area 131 along the length direction, and the terminal welding area 131 is basically located at the center position of the rectangular structure. Thus, when the tabs are welded and fixed to the tab welding areas 132, the distances between the tabs on both sides of the terminal welding area 131 and the terminal 12 are basically the same, effectively reducing the power transmission path between the tabs and the terminal 12. At the same time, the connecting piece 13 is designed as a rectangle, and its length extends along the width direction of the cover body 11. At the same time, tab welding areas 133 are arranged on both sides of the terminal welding area 131 on the connecting piece 13, and the tabs are connected to the tab welding areas 133, so that the center distance between the positive and negative tabs on both sides of the single cell 100 is basically the same as the center distance between the positive and negative terminals, effectively shortening the length of the connecting piece, and at the same time reducing costs and weight.

[0034] Please refer to Figures 2 to 4 As shown, in this embodiment, an embossed structure is provided on the side of the terminal welding area 131 facing away from the cover body 11. The embossing can help remove the oxide layer or other impurities in the welding area, reducing the risk of welding defects such as pores and slag inclusions. At the same time, by applying the embossing, it can ensure that the welding material is more evenly distributed in the welding area, improving the welding quality of the connecting piece 13 and ensuring the connection reliability of the connecting piece 13.

[0035] Please refer to Figures 2 to 4 As shown, in this embodiment, the two tab welding areas 132 on both sides of the terminal welding area 131 are located on the same plane, so that when the tabs are welded and fixed, it can ensure that the pressing force applied during the welding process is evenly distributed, thus avoiding welding defects caused by uneven pressure, and making the tabs basically located on the same plane. The tabs located on the same plane can achieve a more symmetrical welding structure, which can reduce the stress concentration problem caused by asymmetry. At the same time, the same plane design makes the alignment and positioning between the tabs and the terminal more convenient, improving the production efficiency and welding accuracy.

[0036] Please refer to Figures 2 to 4As shown, in this embodiment, a transition section 133 is provided between the tab welding area 132 and the terminal welding area 131. The transition section 133 is an arc section or a straight section. The straight section forms an angle greater than 90 degrees with the tab welding area 132 or the terminal welding area 131, avoiding the occurrence of an angle that is too small in the bending area, which may cause stress concentration and thus affect the service life of the connecting piece 13. In this embodiment, the terminal welding area 131, the tab welding area 132, and the transition section 133 are an integrally formed structure to ensure the structural strength. For example, they can be integrally formed by stamping or other methods.

[0037] Please refer to Figures 2 to 4 As shown, in this embodiment, a chamfer structure 134 is provided at a corner of the connecting piece 13 designed as a rectangular structure. This chamfer structure 134 can play a role in direction identification and positioning when the connecting piece 13 is connected and installed with the cover body 11 and the terminal 12, facilitating the installation and use of the connecting piece 13. Of course, in other embodiments, other identification structures or marks can also be designed on the connecting piece 13 for direction identification and positioning.

[0038] Please refer to Figures 1 to 5 As shown, the present utility model also proposes a single cell 100, which includes a housing 20, an electrode assembly, and a cover 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, and the cover assembly 10 is installed at the opening 201 and fixedly connected to the housing 20. The connecting piece 13 in the cover assembly 10 is welded and fixed to the tab. It can be understood that the cover assembly 10 has the same or similar structure as the cover 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, a magnesium-ion single cell 100, etc. The embodiments of this application are not limited thereto.

[0039] Please refer to Figures 1 to 5As shown, this embodiment also provides a battery, which includes at least one single cell as in the above embodiment. It should be noted that the battery mentioned in the embodiment of the present application refers to a single physical module including one or more single cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. The battery generally includes a shell for encapsulating one or more single cells. The shell can prevent liquid or other foreign matter from affecting the charging or discharging of the single cell. For example, the battery can be a battery module formed by connecting multiple single cells in series or in parallel, or a mixture of series and parallel; or a battery pack can be assembled from multiple such battery modules, or a battery pack and a battery module can be directly formed by combining the single cells.

[0040] The utility model proposes a cover plate assembly, a single cell and a battery, wherein a connecting piece pole ear welding area is bent and protruded relative to a pole column welding area toward a side away from a cover plate body, and the pole ear is folded and welded and fixed to a side of the pole ear welding area facing the cover plate body, so that the connecting piece can play a role in supporting the pole ear, effectively reducing the risk of the pole ear sagging and ensuring the connection reliability between the pole ear and the connecting piece; the connecting piece is also designed to be rectangular, and its length is extended along the width direction of the cover plate body, and pole ear welding areas are arranged on both sides of the connecting piece located at the pole column welding area, and the pole ears are connected to the pole ear welding areas, so that the pole ear center distance is basically the same as the pole column center distance, which effectively shortens the length of the connecting piece and reduces the cost and weight.

[0041] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

[0042] Except for the technical features described in the specification, the other technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present utility model, the other technical features will not be described in detail here.

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, wherein the connecting piece is arranged on a side of the cover body facing the shell, the connecting piece includes a pole welding area and a pole lug welding area located on both sides of the pole welding area, the pole lug welding area is bent and protruded relative to the pole welding area toward a side away from the cover body, and the pole lug is connected to a side of the pole lug welding area facing the cover body.

2. The cover plate assembly according to claim 1, characterized in that: The tab welding area and the pole welding area are connected via a transition section.

3. The cover plate assembly according to claim 2, characterized in that: The transition section is an arc section or a straight section, and an angle greater than 90 degrees is formed between the straight section and the electrode lug welding area or the electrode column welding area.

4. The cover plate assembly according to claim 2, characterized in that: The pole welding area, the pole tab welding area and the transition section are an integrally formed structure.

5. The cover plate assembly according to claim 1, characterized in that: The two pole tab welding areas on both sides of the pole welding area are located on the same plane.

6. The cover plate assembly according to claim 1, characterized in that: A side of the pole welding area facing away from the cover plate body is provided with an embossing structure.

7. The cover plate assembly according to claim 1, characterized in that: The connecting piece is a rectangular structure, the length direction of the connecting piece extends along the thickness direction of the cover plate body, and the pole tab welding area is symmetrically distributed on both sides of the pole welding area along the length direction.

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

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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