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 sheet is arranged on one surface, facing the shell, of the cover plate body, the connecting sheet comprises a pole welding area and tab welding areas positioned on two sides of the pole welding area, the tab welding areas and the pole welding area are positioned on different planes, and the distance between the tab welding areas and the cover plate body is smaller than that between the pole welding area and the cover plate body; the tab is connected to one surface, deviating from the cover plate body, of the tab welding area. According to the utility model, the tab welding area and the pole welding area are positioned on different planes, and the distance between the tab welding area and the cover plate body is smaller than that between the pole welding area and the cover plate body, so that enough bending space is reserved between the tab welding area and the electrode assembly, and the tab can be conveniently bent and connected with a connecting sheet; and the connection quality of the tab and the connecting sheet is improved.

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, a certain height of the pole ear bending space needs to be left in the shell. It is precisely because a certain height of the pole ear bending space needs to be left in the shell that a certain height of the pole ear bending space needs to be left. When the existing connecting pieces are installed, the bending space of the pole ears is insufficient, which affects the bending of the pole ears and the connection and installation with the connecting pieces. 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, a certain height of the pole ear bending space needs to be left in the shell. When the existing connecting piece is installed, the bending space of the pole ear is insufficient, which affects the bending of the pole ear and the connection and installation with the connecting piece.

[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 and the pole welding area are located in different planes, and the distance between the pole lug welding area and the cover body is smaller than the distance between the pole welding area and the cover body, and the pole lug is connected to a side of the pole lug welding area away from 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 an 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 an 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 an 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 an 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 an 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 an embodiment of the present utility model, a chamfer structure is provided at a corner of the rectangular structure.

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

[0016] A housing having an opening;

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

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

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

[0020] The present utility model provides a cover assembly, a single cell battery and a battery. The tab welding area and the terminal welding area are located on different planes, and the distance between the tab welding area and the cover body is less than the distance between the terminal welding area and the cover body, so as to leave sufficient bending space between the tab welding area and the electrode assembly, facilitating the bending of the tab and connecting it to the connecting piece, and improving the connection quality between the tab and the connecting piece; also, by designing the connecting piece as a rectangle, its length extends along the width direction of the cover body, and at the same time, tab welding areas are provided on both sides of the terminal welding area, and the tab is connected to the tab welding area, so that the tab center distance is basically the same as the terminal center distance, 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 invention, the following will briefly introduce the drawings required for describing 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 be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a single cell 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 plate assembly; 11. Cover plate 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 cell. Specific embodiments

[0029] The following illustrates the embodiments of the present invention through specific examples. 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 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 invention.

[0030] It should be noted that the drawings provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. 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. When the existing connecting piece is connected to the pole ear, a certain height of the pole ear bending space needs to be left in the shell. It is necessary to leave a certain height of the pole ear bending space in the shell. When the existing connecting piece is installed, the bending space of the pole ear is insufficient, which affects the bending of the pole ear and the connection and installation of the connecting piece. For example, when the bending space of the pole ear is insufficient, the pole ear needs to be bent to a greater extent to accommodate the same number of pole ears, which is not conducive to the use of the pole ear and is not convenient for the pole ear. Welding with the connecting piece, therefore, the utility model proposes a cover assembly to solve the above problem. Specifically, the cover assembly 10 includes a cover body 11, a pole 12 and a connecting piece 13. The cover body 11 is used to connect with the shell 20 of the single battery 100. A first mounting through hole begins to be provided on the cover body 11. The pole 12 is passed through the first mounting through hole and is connected to the cover body 11. The connecting piece 13 is provided on the side of the cover 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, and 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 tab welding area 132 and the pole welding area 131 are located in different planes, and the distance between the tab welding area 132 and the cover body 11 is smaller than the distance between the pole welding area 131 and the cover body 11, that is, the tab welding area 132 is bent and protruded toward the side close to the cover body 11 relative to the pole welding area 131, so that when the cover assembly 10 and the shell 20 of the single battery 100 are installed, there is enough bending space between the connecting piece 13 and the electrode assembly, so that the tab is convenient for bending in the space and being welded and fixed to the side of the tab welding area 132 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 smaller than the distance between the upper surface of the pole welding area 131 and the cover body 11. The distance between the lower surface of the pole lug welding area 132 and the electrode assembly is larger than the distance between the pole welding area 131 and the electrode assembly. 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 electrode assembly, which is conducive to the bending of the pole lug and the welding and fixing with the lower surface of the pole lug welding area 132. At the same time, it can also reduce the overall height of the battery to a certain extent and improve the energy density.

[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 plate body 11. The tab welding areas 132 are symmetrically distributed on both sides of the terminal welding area 131 along the length direction. 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 plate 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 surface of the terminal welding area 131 facing away from the cover plate body 11. The embossing can help remove the oxide layer or other impurities in the welding area, reducing the risk of welding defects. 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 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 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 identifying the direction 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 identifying structures or marks can also be designed on the connecting piece 13 for identifying the direction and positioning.

[0038] Please refer to Figures 1 to 5 As shown, the present utility model further provides 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. The cover assembly 10 is installed at the opening 201 and is 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 structure of the cover assembly 10 is the same as or similar to that 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 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 by multiple such battery modules, or it can also be a battery pack and a battery module directly formed by combining the single batteries.

[0040] The present utility model provides a cover plate assembly, a single battery and a battery. The ear welding area and the pole welding area are located on different planes, and the distance between the ear welding area and the cover plate body is less than the distance between the pole welding area and the cover plate body, so as to leave enough bending space between the ear welding area and the electrode assembly, facilitating the bending of the ear and its connection with the connecting piece, and improving the connection quality between the ear and the connecting piece. 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, the ear welding areas are arranged on both sides of the pole welding area, and the ears are connected to the ear welding areas, making the center distance between the ears basically the same as the center distance between the poles, effectively shortening the length of the connecting piece, reducing costs and weight.

[0041] 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. 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.

[0042] Except for the technical features described in the specification, the remaining technical features are well-known to those skilled in the art. To highlight the innovative features of the present utility model, the remaining technical features will not be elaborated herein.

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 and the pole welding area are located in different planes, and the distance between the pole lug welding area and the cover body is smaller than the distance between the pole welding area and the cover body, and the pole lug is connected to a side of the pole lug welding area away from 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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