Top cover assembly, battery and electric equipment

Abstract

The utility model relates to the technical field of lithium batteries, and provides a top cover assembly, a battery and electric equipment, the top cover assembly comprises a cover plate and a sealing structure, one side of the cover plate in the thickness direction is provided with a liquid injection hole, and the other side of the cover plate in the thickness direction is provided with a through hole communicated with the liquid injection hole; the wall surface of the liquid injection hole is an arc surface and / or an inclined surface, the inclined surface is inclined to the thickness direction of the cover plate, one part of the sealing structure is hermetically connected with the through hole, and the other part of the sealing structure is welded with the liquid injection hole. Under the structure, overflowed electrolyte is difficult to hide on the surface of the liquid injection hole, and meanwhile, the structure is more convenient for workers to wipe residual liquid or crystals on the surface of the liquid injection hole, so that the risk of bad problems such as welding air holes and cracks after the liquid injection hole is welded with the sealing structure can be effectively reduced, the risk of liquid leakage of the battery is reduced, and the service life of the battery is prolonged. And the safety performance of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a top cover assembly, a battery, and an electrical device. Background Technology

[0002] The new energy market is becoming increasingly competitive, and companies are raising their requirements for battery manufacturing processes and costs. As a crucial component of the battery, the airtightness of the top cover directly affects the safety of the entire battery or battery module. Existing top cover electrolyte injection hole structures are generally countersunk groove structures. During battery manufacturing, especially in the electrolyte injection process (including the first and second injections), large injection volumes, inadequate battery transfer before sealing, and insufficient cleaning can easily lead to overflow. Once overflow occurs, the countersunk groove of the injection hole can easily trap electrolyte, which is difficult to clean thoroughly using conventional injection hole structures. This can cause residual electrolyte in the countersunk groove to generate gas when it encounters high temperatures during the welding of the top cover to the sealing aluminum nail, resulting in pinholes and cracks in the weld, ultimately leading to battery leakage and compromising battery safety. Utility Model Content

[0003] The purpose of this utility model is to provide a top cover assembly, a battery, and an electrical device, which aims to solve the technical problem that existing batteries are prone to leakage, resulting in low battery safety performance.

[0004] In a first aspect, this application provides a top cover assembly, which includes a cover plate and a sealing structure. The cover plate has an injection hole on one side in its thickness direction and a through hole communicating with the injection hole on the other side in its thickness direction. The wall surface of the injection hole is an arc surface and / or an inclined surface, wherein the inclined surface is inclined to the thickness direction of the cover plate. A part of the sealing structure is sealed to the through hole, and another part of the sealing structure is welded to the injection hole.

[0005] The beneficial effects of the top cover assembly provided by this utility model are as follows: Compared with the countersunk groove structure, the wall surface of the liquid injection hole of this cover plate is only an arc surface and / or an inclined surface. For example, the wall surface of the liquid injection hole of this cover plate is only an arc surface; or, for another example, the wall surface of the liquid injection hole of this cover plate is only an inclined surface; or, for yet another example, the wall surface of the liquid injection hole of this cover plate has both an arc surface and an inclined surface. The inclined surface mentioned in this application refers to a surface inclined in the thickness direction of the cover plate. With this structure, overflowing electrolyte is less likely to accumulate on the surface of the liquid injection hole. At the same time, this structure makes it easier for workers to wipe away residual liquid or crystals on the surface of the liquid injection hole, effectively reducing the risk of welding defects such as porosity and cracks after the liquid injection hole is welded to the sealing structure, thereby reducing the risk of battery leakage and improving battery safety performance.

[0006] Optionally, the injection hole includes a first hole section and a second hole section. The first hole section is located on the side of the second hole section away from the through hole. The wall surface of the first hole section is an arc surface and / or an inclined surface, and the wall surface of the second hole section is an arc surface and / or an inclined surface. A portion of the sealing structure is welded to the second hole section.

[0007] Optionally, the first hole segment and the second hole segment are connected by a circular arc transition.

[0008] Optionally, the second hole segment is connected to the through hole by a circular arc transition.

[0009] Optionally, the sealing structure includes a first seal and a second seal. The first seal is welded to the second hole section, and the second seal is sealed to the through hole. A receiving groove is formed on the surface of the first seal near the second seal, and the receiving groove is used to receive the second seal.

[0010] Optionally, a groove is formed on the surface of the first seal away from the second seal.

[0011] Optionally, the end of the first seal away from the second seal is clearance-fitted with the first bore section.

[0012] Optionally, the first seal is fully contained within the injection hole.

[0013] Secondly, this application provides a battery including the aforementioned top cover assembly.

[0014] Thirdly, this application provides an electrical device including the aforementioned battery. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the battery structure provided in an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the top cover assembly provided in an embodiment of the present utility model;

[0018] Figure 3 Another structural schematic diagram of the top cover assembly provided in this embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the first sealing element provided in an embodiment of the present utility model.

[0020] The following are the labeling elements in the figure:

[0021] 100. Top cover assembly; 10. Cover plate; 20. Sealing structure;

[0022] 11. Injection hole; 12. Through hole; 111. First hole section;

[0023] 112. Second hole section; 21. First seal; 22. Second seal;

[0024] 211. Receiving slot; 212. Groove; 200. Battery;

[0025] 210. Shell. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0028] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Please refer to Figures 1 to 4 The top cover assembly 100, battery 200 and electrical equipment in the embodiments of this utility model will now be described.

[0032] Please refer to Figures 1 to 3 The top cover assembly 100 provided in this application includes a cover plate 10 and a sealing structure 20. The cover plate 10 has an injection hole 11 on one side in its thickness direction, and a through hole 12 communicating with the injection hole 11 on the other side in its thickness direction. The wall surface of the injection hole 11 is an arc surface and / or an inclined surface, wherein the inclined surface is inclined to the thickness direction of the cover plate 10. A portion of the sealing structure 20 is sealed to the through hole 12, and another portion of the sealing structure 20 is welded to the injection hole 11. The thickness direction of the cover plate 10 is parallel to the vertical direction. The injection hole 11 is located on the upper surface of the cover plate 10, and the through hole 12 is located on the lower surface of the cover plate 10.

[0033] During electrolyte injection, the electrolyte passes sequentially through the injection hole 11 and the through hole 12. Compared to the countersunk groove structure, the wall surface of the injection hole 11 of this cover plate 10 is only an arc surface and / or an inclined surface. For example, the wall surface of the injection hole 11 of this cover plate 10 is only an arc surface; another example is that the wall surface of the injection hole 11 of this cover plate 10 is only an inclined surface; yet another example is that the wall surface of the injection hole 11 of this cover plate 10 has both an arc surface and an inclined surface. Among them, the inclined surface mentioned in this application is the surface inclined in the thickness direction of the cover plate 10. With this structure, it is difficult for overflowing electrolyte to be trapped on the surface of the injection hole 11. At the same time, this structure makes it easier for workers to wipe clean the residual liquid or crystals on the surface of the injection hole 11. This can effectively reduce the risk of welding porosity, cracks and other defects after the injection hole 11 is welded to the sealing structure 20, thereby reducing the risk of battery 200 leakage and improving the safety performance of battery 200.

[0034] In another embodiment of this application, please refer to Figure 2 and Figure 3The injection hole 11 includes a first hole segment 111 and a second hole segment 112. The first hole segment 111 is located on the side of the second hole segment 112 away from the through hole 12. The wall surface of the first hole segment 111 is an arc surface and / or an inclined surface, and the wall surface of the second hole segment 112 is an arc surface and / or an inclined surface. A portion of the sealing structure 20 is welded to the second hole segment 112. Specifically, the first hole segment 111 is located above the second hole segment 112. In this embodiment, the injection hole 11 is a circular hole, and the walls of both the first hole segment 111 and the second hole segment 112 are arc surfaces. The wall surface of the first hole segment 111 unfolds into a fan shape, and the wall surface of the second hole segment 112 also unfolds into a fan shape.

[0035] In some other embodiments, if the injection hole 11 is a square hole, then the wall surface of the first hole segment 111 and the wall surface of the second hole segment 112 are both inclined surfaces.

[0036] In some other embodiments, the wall surface of the first hole segment 111 may be an inclined surface, while the wall surface of the second hole segment 112 may be an arc surface.

[0037] In another embodiment of this application, the first hole segment 111 and the second hole segment 112 are connected by an arc transition. This configuration can further reduce the possibility of electrolyte accumulating on the surface of the injection hole 11, thereby further reducing the risk of battery 200 leakage and further improving the safety performance of battery 200.

[0038] In another embodiment of this application, the second hole segment 112 and the through hole 12 are connected by an arc transition. This configuration can further reduce the possibility of electrolyte accumulating on the surface of the injection hole 11, thereby further reducing the risk of battery 200 leakage and further improving the safety performance of battery 200.

[0039] In another embodiment of this application, please refer to Figure 2 and Figure 3 The sealing structure 20 includes a first sealing element 21 and a second sealing element 22. The first sealing element 21 is welded to the second hole segment 112, and the second sealing element 22 is sealed to the through hole 12. A receiving groove 211 is formed on the surface of the first sealing element 21 near the second sealing element 22 to receive the second sealing element 22. Specifically, the first sealing element 21 is a sealing metal nail, wherein the material of the sealing metal nail can be aluminum. The second sealing element 22 is a sealing rubber nail. The first sealing element 21 is located above the second sealing element 22. After the second sealing element 22 is inserted into the through hole 12, the first sealing element 21 is placed into the injection hole 11, and finally the first sealing element 21 is welded to the second hole segment 112.

[0040] In another embodiment of this application, please refer to Figure 3 and Figure 4A groove 212 is formed on the surface of the first seal 21 away from the second seal 22. Specifically, the groove 212 is annular in shape and located in the edge region of the first seal 21. After the first seal 21 is welded to the injection hole 11, there will be welding stress. The presence of the groove 212 makes the outer side of the first seal 21 form a thin-walled structure, which can release welding stress and reduce the possibility of stress concentration causing cracks in the weld.

[0041] In another embodiment of this application, please refer to Figure 2 and Figure 3 The end of the first sealing element 21 furthest from the second sealing element 22 is clearance-fitted with the first hole segment 111. Specifically, the upper end of the first sealing element 21 corresponds to the first hole segment 111, and the lower end of the second sealing element 22 corresponds to the second hole segment 112. The diameter of the upper end of the first sealing element 21 is larger than the diameter of the lower end of the second sealing element 22. The shape of the lower end of the second sealing element 22 is the same as the shape of the wall surface of the second hole segment 112. For example, when the wall surface of the second hole segment 112 is curved, the shape of the lower end of the second sealing element 22 is also curved. This increases the contact area between the second sealing element 22 and the second hole segment 112, thereby improving the welding quality. By configuring the upper end of the first sealing element 21 to be clearance-fitted with the first hole segment 111, i.e., the diameter of the upper end of the first sealing element 21 is smaller than the diameter of the first hole segment 111, the assembly of the first sealing element 21 with the injection hole 11 is facilitated.

[0042] In another embodiment of this application, please refer to Figure 2 and Figure 3 The first sealing element 21 is completely contained within the injection hole 11, that is, the upper surface of the first sealing element 21 is lower than the upper surface of the injection hole 11. This arrangement can protect the first sealing element 21, reduce the possibility of the first sealing element 21 colliding with foreign objects, and thus ensure the stable welding of the first sealing element 21 and the injection hole 11.

[0043] This application also provides a battery 200, which includes a housing 210, a battery cell, and the aforementioned top cover assembly 100.

[0044] This application also provides an electrical device including the aforementioned battery 200. The electrical device may include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A top cover assembly, characterized in that, include: A cover plate (10) has an injection hole (11) on one side of its thickness direction and a through hole (12) communicating with the injection hole (11) on the other side of its thickness direction. The wall surface of the injection hole (11) is an arc surface and / or an inclined surface, wherein the inclined surface is inclined to the thickness direction of the cover plate (10). A sealing structure (20) is provided, a part of which is sealed to the through hole (12), and another part of which is welded to the injection hole (11).

2. The roof assembly of claim 1, wherein: The injection hole (11) includes a first hole segment (111) and a second hole segment (112). The first hole segment (111) is located on the side of the second hole segment (112) away from the through hole (12). The wall surface of the first hole segment (111) is an arc surface and / or an inclined surface. The wall surface of the second hole segment (112) is an arc surface and / or an inclined surface. A portion of the sealing structure (20) is welded to the second hole segment (112).

3. The roof assembly of claim 2, wherein: The first hole segment (111) and the second hole segment (112) are connected by a circular arc transition.

4. The roof assembly of claim 2, wherein: The second hole segment (112) is connected to the through hole (12) by a circular arc transition.

5. The roof assembly of claim 2, wherein: The sealing structure (20) includes a first sealing element (21) and a second sealing element (22). The first sealing element (21) is welded to the second hole segment (112), and the second sealing element (22) is sealed to the through hole (12). The first sealing element (21) has a receiving groove (211) on its surface near the second sealing element (22), and the receiving groove (211) is used to receive the second sealing element (22).

6. The roof assembly of claim 5, wherein: The surface of the first seal (21) away from the second seal (22) has a groove (212).

7. The roof assembly of claim 5, wherein: The end of the first seal (21) away from the second seal (22) is clearance-fitted with the first hole section (111).

8. The roof assembly of claim 5, wherein: The first seal (21) is completely contained within the injection hole (11).

9. A battery, characterized by: Includes the top cover assembly (100) as described in any one of claims 1 to 8.

10. An electrical device, characterized by: Includes the battery (200) as described in claim 9.

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