Top cover, battery cover cap and battery

Abstract

The utility model provides a top cover, a battery cover cap and a battery. The top cover comprises a first cover body, a second cover body, a first cover cap, a second cover cap, a first cover cap and a second cover cap, the multiple connecting parts are arranged between the first cover body and the second cover body, the first ends of the connecting parts are connected with the first cover body, the second ends of the connecting parts are connected with the second cover body, and the multiple connecting parts are arranged in the circumferential direction of the second cover body at intervals; the plurality of bonding wires are arranged on the second cover body, the bonding wires are arranged in one-to-one correspondence with the second ends, and the top cover is connected with the explosion-proof sheet in a welding manner through the bonding wires; wherein in the radial direction of the second cover body, the center line of the bonding wire coincides with the center line of the corresponding second end, and / or, in the radial direction of the second cover body, the projection of the second end is located in the projection area of the corresponding bonding wire. According to the technical scheme, the technical problem that the resistance value of the cap is high can be solved.

Description

Technical Field

[0001] This utility model relates to the field of top cover technology, specifically to a top cover, a battery cap, and a battery. Background Technology

[0002] The cap of a lithium battery is one of the key components of a power lithium battery. It is responsible for issues such as the safety and reliability of the battery, and directly affects the personal safety and property safety in production and daily life.

[0003] Existing cap assemblies include a top cover and an explosion-proof plate. The top cover and the explosion-proof plate are welded together. Typically, a welding wire is set on the top cover, and then the top cover and the explosion-proof plate are welded together by the welding wire. In related technologies, the welding wire between the top cover and the explosion-proof plate adopts a segmented arc. The diameter, angle, and width of the welding wire are determined, but the relative position of the welding wire and the top cover is randomly set. That is, the angle between the center line of the top cover and the center line of the welding wire is uncertain. This will result in a high resistance value of the top cover and a large resistance tolerance, thus failing to meet the user's needs. Utility Model Content

[0004] The embodiments of this utility model provide a top cover, a battery cap, and a battery, which can improve the technical problem of high resistance in the cap.

[0005] In a first aspect, an embodiment of the present invention provides a top cover, the top cover comprising: a first cover body, a second cover body, spaced apart from the first cover body, the axis of the first cover body being parallel to the axis of the second cover body; a plurality of connecting parts, disposed between the first cover body and the second cover body, the first end of the connecting parts being connected to the first cover body, the second end of the connecting parts being connected to the second cover body, the plurality of connecting parts being arranged at intervals along the circumference of the second cover body; a plurality of welding lines, disposed on the second cover body, the welding lines being disposed one-to-one with the second ends, the top cover being welded to the explosion-proof sheet by welding lines; wherein, in the radial direction of the second cover body, the center line of the welding line coincides with and / or the center line of the corresponding second end is located within the projection area of ​​the corresponding welding line in the radial direction of the second cover body.

[0006] In one embodiment, the bonding wire includes an arcuate structure, with multiple arcuate structures located on the same circumference, and the circumference being concentric with the second cover.

[0007] In one embodiment, the multiple arc structures have the same curvature and are evenly distributed on the circumference.

[0008] In one embodiment, the arc length of the arc structure is between 5 mm and 7.6 mm.

[0009] In one embodiment, the curvature of the arc structure is between 40° and 60°.

[0010] In one embodiment, the radial extension length of the arcuate structure in the second cover is between 0.2 mm and 0.3 mm.

[0011] In one embodiment, a plurality of connecting portions are evenly arranged along the circumference of the second cover.

[0012] In one embodiment, the first cover, the second cover, and the plurality of connecting parts are integrally formed.

[0013] In one embodiment, the axis of the first cover coincides with the axis of the second cover.

[0014] In one embodiment, the second end of the connector is located near the center of the second cover, and the welding line is located near the edge of the second cover.

[0015] In one embodiment, the bonding wire includes three arc-shaped structures.

[0016] In one embodiment, the bonding wire also includes a straight structure.

[0017] Secondly, an embodiment of the present invention provides a battery cap, which includes: the aforementioned top cover; and an explosion-proof sheet, which is welded to the top cover by a welding wire, and the explosion-proof sheet is located on the side of the second cover away from the first cover.

[0018] Thirdly, embodiments of this utility model provide a battery, which includes the aforementioned battery cap.

[0019] By applying the technical solution of this utility model, multiple welding lines are provided on the second cover, with the center line of the welding line coinciding with and / or the center line of the corresponding second end coinciding with the center line of the second end in the radial direction of the second cover, and the projection of the second end located within the projection area of ​​the corresponding welding line. By setting the above structure, the resistance of the top cover can be reduced, and the resistance tolerance of the top cover can also be reduced to meet the user's needs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0021] Figure 1 This is a schematic diagram of the top cover provided in an embodiment of the present invention.

[0022] The above figures include the following reference numerals:

[0023] 1. Top cover; 2. Explosion-proof sheet;

[0024] 10. First cover body;

[0025] 20. Second cover;

[0026] 30. Connecting part;

[0027] 40. Solder wire. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1 As shown, in a first aspect, an embodiment of the present invention provides a top cover 1, the top cover 1 comprising: a first cover body 10 and a second cover body 20, which are spaced apart from the first cover body 10, the axis of the first cover body 10 being parallel to the axis of the second cover body 20; a plurality of connecting parts 30, which are disposed between the first cover body 10 and the second cover body 20, the first end of the connecting part 30 being connected to the first cover body 10 and the second end of the connecting part 30 being connected to the second cover body 20, the plurality of connecting parts 30 being arranged at intervals along the circumference of the second cover body 20; and a plurality of welding lines 40, which are disposed on the second cover body 20, the welding lines 40 being disposed one-to-one with the second ends, the top cover 1 being welded to the explosion-proof sheet 2 through the welding lines 40; wherein, in the radial direction of the second cover body 20, the center line of the welding line 40 coincides with the center line of its corresponding second end and / or, in the radial direction of the second cover body 20, the projection of the second end is located within the projection area of ​​its corresponding welding line 40.

[0030] By applying the technical solution of this utility model, multiple welding lines 40 are provided on the second cover 20. The center line of the welding line 40 coincides with the center line of its corresponding second end, and / or, in the radial direction of the second cover 20, the projection of the second end is located within the projection area of ​​its corresponding welding line 40. By setting the above structure, when current is present in the top cover 1, because the welding lines are located close to the second end of the connecting part 30, the flow path of the current on the top cover 1 can be reduced, thereby reducing current loss during flow. This is equivalent to reducing the resistance of the top cover 1, and simultaneously reducing the resistance tolerance of the top cover 1 to meet the user's needs.

[0031] In one embodiment, the bonding wire 40 includes an arc-shaped structure, with multiple arc-shaped structures located on the same circumference, and the circumference being concentric with the second cover 20. By setting the above structure so that the circumference of the bonding wire 40 is concentric with the second cover 20, it not only facilitates the processing of the bonding wire 40 and reduces the processing difficulty of the bonding wire 40, thereby reducing the processing cost of the bonding wire 40, but also effectively enables batch processing to improve the processing efficiency of the bonding wire 40.

[0032] In one embodiment, multiple arc-shaped structures have the same curvature and are evenly distributed on the circumference. The arc-shaped structures are typically designed and manufactured with stability in mind, thus offering better safety performance. When the welding wire 40 is subjected to external force, the arc-shaped structures can better disperse pressure, reducing localized stress concentration and lowering the risk of damage to the welding wire 40. Simultaneously, the arc-shaped design can fully utilize the space of the second cover 20; the layout of the arc-shaped structures can create a more rational use space, improving the space utilization rate of the second cover 20.

[0033] In one embodiment, the arc length of the arc structure is between 5mm and 7.6mm. When the arc length of the arc structure is greater than 7.6mm, it will occupy too much space. Since the area of ​​the second cover 20 is fixed, the number of arc structures required is reduced, but the material required for production will also increase. When the arc length is less than 5mm, the arc structure is too small, which is not conducive to its processing and increases the processing difficulty, thus increasing the processing cost. Therefore, setting the arc length between 5mm and 7.6mm not only ensures the structural strength and stability of the arc structure and minimizes material waste, but also allows for the use of less material to achieve the desired effect, and enables a compact layout, thereby saving space and improving the integration of the overall design. In this application, the arc length can be set to 5mm, 6mm, or 7.6mm, etc. The specific setting is not limited here, as long as it meets the welding requirements of the top cover 1 and the explosion-proof sheet 2, thus improving the applicability and scope of application of the top cover 1.

[0034] In one embodiment, the curvature of the arc structure is between 40° and 60°. When the curvature of the arc structure is greater than 60°, it may lead to a decrease in the stability of the arc structure, increasing the risk of deformation and damage under external forces, thereby reducing the service life of the welding wire 40. When the curvature of the arc structure is less than 40°, the curvature is too small, which is not conducive to the processing of the arc structure, increases the processing difficulty, and thus increases the processing cost. Therefore, setting the curvature of the arc structure between 40° and 60° can not only ensure the structural strength and stability of the arc structure and reduce the risk of deformation and damage under external forces, thereby increasing the service life of the welding wire 40, but also facilitate the processing of the arc structure, reduce the processing difficulty, and thus reduce the processing cost. In this application, the curvature can be set to 40°, 50°, or 60°, etc., and the specific setting is not limited here, as long as it can meet the welding requirements of the top cover 1 and the explosion-proof sheet 2, thereby improving the applicability and scope of application of the top cover 1.

[0035] In one embodiment, the radial extension length of the arc-shaped structure on the second cover 20 is between 0.2mm and 0.3mm. When the radial extension length of the arc-shaped structure on the second cover 20 is greater than 0.3mm, the arc-shaped structure occupies too much space. Since the area of ​​the second cover 20 is fixed, this reduces the number of arc-shaped structures required, while also increasing the material required for their production. When the radial extension length of the arc-shaped structure on the second cover 20 is less than 0.2mm, the arc-shaped structure is too small, which is not conducive to its processing and increases the processing difficulty, thus increasing the processing cost. Therefore, setting the radial extension length of the arc-shaped structure on the second cover 20 between 0.2mm and 0.3mm not only ensures the structural strength and stability of the arc-shaped structure and minimizes material waste, but also allows for the use of less material to achieve the desired effect, and enables a compact layout, thereby saving space and improving the overall design integration. In this application, the arc length can be set to 0.2mm, 0.25mm or 0.3mm, etc. The specific setting is not limited here, as long as it can meet the welding requirements of the top cover 1 and the explosion-proof sheet 2, which can improve the applicability and scope of application of the top cover 1.

[0036] In this application, the radial extension length of the arc-shaped structure in the second cover 20 specifically refers to the distance between the side of the arc-shaped structure near the connecting portion 30 and the side of the arc-shaped structure away from the connecting portion 30, which can be understood as the thickness of the arc-shaped structure.

[0037] In one embodiment, a plurality of connecting portions 30 are evenly arranged along the circumference of the second cover 20. This arrangement allows the plurality of connecting portions 30 to be subjected to force evenly, and also facilitates the connection of the connecting portions 30 with the first cover 10 and the second cover 20, thereby improving the overall structural strength of the top cover 1.

[0038] In one embodiment, the first cover 10, the second cover 20, and the multiple connecting parts 30 are integrally formed. The integral molding process integrates multiple processes into one operation, significantly shortening the production cycle and improving production efficiency. Furthermore, the automated integral molding technology utilizes automated equipment and process control systems to achieve full automation from raw material processing to finished product output, further enhancing production efficiency. Moreover, the integral molding process employs advanced mold design and manufacturing technology, ensuring that the material accurately fills every detail of the mold during the molding process, thereby improving the dimensional and shape accuracy of the product.

[0039] Furthermore, unibody molding eliminates secondary processing steps found in traditional methods, reducing surface imperfections and defects, and improving overall product quality. In addition, appropriate heat treatment during unibody molding helps increase the material's hardness and strength, thereby extending the product's lifespan and reliability.

[0040] In one embodiment, the axis of the first cover 10 coincides with the axis of the second cover 20. This makes the first cover 10 and the second cover 20 concentrically arranged. Concentric arrangement allows the two components to share the same central axis radially, thereby reducing their space occupation in the plane and making the overall structure more compact. This compact design not only benefits the overall layout of the equipment but also reduces the size and weight of the equipment, facilitating installation and transportation. Furthermore, since the two components are arranged around the same central axis, their relative positions are fixed and stable. Moreover, the two concentrically arranged components are structurally relatively independent but interconnected. This design makes it easier to disassemble and replace damaged parts during maintenance without requiring large-scale disassembly of the entire system.

[0041] In one embodiment, the second end of the connecting portion 30 is positioned near the center of the second cover 20, and the welding wire 40 is positioned near the edge of the second cover 20. This facilitates the processing of the welding wire 40 and also facilitates the welding of the second cover 20 and the explosion-proof sheet 2, improving the welding efficiency. Of course, in other embodiments of this application, the second end of the connecting portion 30 can be positioned near the edge of the second cover 20, and the welding wire 40 can be positioned near the center of the second cover 20, as long as the welding requirements of both can be met.

[0042] In one embodiment, the bonding wire 40 includes three arc-shaped structures. Optionally, the number of bonding wires 40 is not specifically limited, and the number should be selected according to the usage environment of the top cover 1, so as to improve the applicability and suitability of the top cover 1.

[0043] In one embodiment, the bonding wire 40 further includes a straight structure. Optionally, the shape of the bonding wire 40 is not specifically limited, and the shape should be selected according to the usage environment of the top cover 1, so as to improve the applicability and suitability of the top cover 1.

[0044] Secondly, an embodiment of the present invention provides a battery cap, which includes: the aforementioned top cover 1; and an explosion-proof sheet 2, which is welded to the top cover 1 via a welding wire 40, wherein the explosion-proof sheet 2 is located on the side of the second cover 20 away from the first cover 10.

[0045] Thirdly, embodiments of this utility model provide a battery, which includes the aforementioned battery cap.

[0046] By applying the technical solution of this utility model, the welding line 40 on the second cover 20 is positioned radially on the second cover 20, with the center line of the welding line 40 coinciding with the center line of its corresponding second end, and / or the projection of the second end is located within the projection area of ​​its corresponding welding line 40 radially on the second cover 20. By setting the above structure, the resistance of the top cover 1 can be reduced, and the resistance tolerance of the top cover 1 can also be reduced to meet the user's needs.

[0047] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0049] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0050] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0051] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cap, characterized in that, The top cover includes: First cover, The second cover is disposed at a distance from the first cover, and the axis of the first cover is parallel to the axis of the second cover. Multiple connecting parts are disposed between the first cover and the second cover. The first end of each connecting part is connected to the first cover, and the second end of each connecting part is connected to the second cover. The multiple connecting parts are arranged at intervals along the circumference of the second cover. Multiple welding lines are set on the second cover, and each welding line is set one-to-one with the second end. The top cover is welded to the explosion-proof sheet through the welding lines. Wherein, in the radial direction of the second cover, the centerline of the welding wire coincides with and / or the centerline of its corresponding second end. In the radial direction of the second cover, the projection of the second end lies within the projection area of ​​the corresponding weld line.

2. The cap of claim 1, wherein The welding line includes an arc-shaped structure, and multiple arc-shaped structures are located on the same circumference, with the circumference being concentric with the second cover.

3. The cap of claim 2, wherein The multiple arc-shaped structures have the same curvature and are evenly distributed on the circumference.

4. The cap of claim 2, wherein The arc length of the arc structure is between 5mm and 7.6mm.

5. The cap of claim 2, wherein The arc of the arc structure is between 40° and 60°.

6. The cap of claim 2, wherein The radial extension length of the arc-shaped structure in the second cover is between 0.2 mm and 0.3 mm.

7. The cap of any one of claims 1-6, wherein, The plurality of connecting portions are evenly arranged along the circumference of the second cover.

8. The cap of any one of claims 1-6, wherein, The first cover, the second cover, and the plurality of connecting parts are integrally formed.

9. The cap of any one of claims 1-6, wherein, The axis of the first cover coincides with the axis of the second cover.

10. The cap of any one of claims 1-6, wherein, The second end of the connecting part is located near the center of the second cover, and the welding line is located near the edge of the second cover.

11. The cap of any one of claims 2-6, wherein, The welding wire includes three of the aforementioned arc-shaped structures.

12. The cap of any one of claims 1-6, wherein, The welding wire also includes a straight structure.

13. A battery cap, characterized by The battery cap includes: Top cover as described in any one of claims 1-12; An explosion-proof sheet is welded to the top cover via the welding line, and the explosion-proof sheet is located on the side of the second cover away from the first cover.

14. A battery, characterized by The battery includes the battery cap as described in claim 13.

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