A kind of flattening tooling of circular battery top cover connecting piece

Abstract

The utility model discloses a kind of flattening tool of circular battery top cover connecting piece, it is related to power battery manufacturing technical field, the flattening tool of this circular battery top cover connecting piece includes: first template and second template, first template and second template are mutually embedded, between first template and second template, there are several groups of concave-convex structure, concave-convex structure is used to press together to strengthen rib for product.The flattening tool of this circular battery top cover connecting piece, product before flattening is placed on second template, first template is made to move downward by external driving mechanism, until first template and second template are embedded, first template and second template are effectively flattened by embedding curved connecting piece, concave-convex structure is pressed out reinforcing rib for connecting piece, reinforcing rib can effectively reduce the deformation bending condition of subsequent connecting piece due to external force, improve the strength of connecting piece, on the connecting piece after flattening, tab is welded, can improve the yield of both welding.

Description

Technical Field

[0001] This utility model relates to the field of power battery manufacturing technology, and in particular to a flattening tool for a circular battery top cover connecting piece. Background Technology

[0002] Power batteries are batteries used to provide electricity and are widely used in electric vehicles, energy storage systems, and other devices requiring high power output. Compared to traditional small electronic batteries, power batteries have higher capacity and power output, enabling them to support longer operating times. The battery cover connector in a power battery is typically a component used for the electrical connection between the battery cover and the internal battery cells. It is part of the battery module design, serving to connect the battery circuitry and the internal battery management system (BMS). Because the connector provides electrical connection, safety assurance, and protection, it is an indispensable part of the power battery.

[0003] In existing technologies, during the manufacturing of power batteries, the connecting pieces need to be welded to the cover plate rivets. The welding method is usually laser welding. However, the welding process inevitably involves high temperatures, which cause the connecting pieces to bend and deform due to heat, affecting the yield of subsequent welding of tabs onto the connecting pieces. Utility Model Content

[0004] This invention provides a flattening fixture for a circular battery top cover connecting piece, which can solve the problem mentioned in the background art where the connecting piece is deformed by heat, affecting the yield of subsequent welding tabs on the connecting piece.

[0005] A leveling fixture for a circular battery top cover connecting piece includes: a first template and a second template, wherein the first template and the second template are interlocked. Several sets of concave and convex structures are provided between the first template and the second template. The concave and convex structures are used to press the product to form reinforcing ribs.

[0006] Preferably, each set of the concave-convex structure includes multiple grooves, which are formed on the top of the first template.

[0007] Preferably, each set of the concave-convex structure includes multiple punches, which are disposed at the bottom of the second template.

[0008] Preferably, the position of the groove corresponds one-to-one with the position of the punch.

[0009] Preferably, in each set of the concave and convex structures, a positioning post is provided between two adjacent grooves.

[0010] Preferably, the positioning column is fixedly installed on the first template.

[0011] Preferably, the second template has several clearance grooves.

[0012] Preferably, in each set of the concave-convex structure, a clearance groove is provided between two adjacent punches.

[0013] Preferably, the position of the positioning post corresponds one-to-one with the position of the avoidance groove.

[0014] Preferably, the shape of the positioning post is adapted to the shape of the positioning hole on the product.

[0015] The beneficial effects of this utility model are: In use, the leveling fixture for the circular battery top cover connecting piece has a first template on top and a second template on the bottom. The product (connecting piece) before leveling is placed on the second template. Then, the first template can be moved downward by an external drive mechanism until the first template and the second template are engaged. The engagement of the first template and the second template effectively leveles the bent connecting piece. Furthermore, the concave and convex structure presses out reinforcing ribs on the leveled connecting piece. The reinforcing ribs can effectively reduce the deformation and bending of the connecting piece caused by external forces, thereby improving the strength of the connecting piece. Welding the tabs onto the leveled connecting piece can improve the welding yield. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a flattening tool for a circular battery top cover connecting piece provided by this utility model; Figure 2 Exploded view of a flattening fixture for a circular battery top cover connecting piece provided by this utility model; Figure 3 for Figure 2 A schematic diagram of the structure of the first template; Figure 4 for Figure 2 The bottom view of the second template in the middle; Figure 5 This is a structural diagram of the product before leveling; Figure 6 This is a schematic diagram of the product structure after leveling.

[0017] Explanation of reference numerals in the attached figures: 1. First template; 2. Second template; 3. Groove; 4. Positioning pin; 5. Punch; 6. Recessed groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", 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.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0023] The battery top cover connector serves multiple functions, including electrical connection, safety assurance, and protection. It provides a conductive path between the battery cover and the internal electrical system of the battery, ensuring smooth signal transmission and energy exchange between the battery cells and the battery management system. In the high-current and high-voltage environment of the battery, the connector is typically made of a material with good conductivity to ensure the stability and safety of current flow. The design of the battery top cover connector usually needs to consider the protection of internal battery components, preventing short circuits in case of increased internal battery temperature or other problems. Therefore, as an indispensable part of the power battery, the connector requires strict quality control during manufacturing.

[0024] The inventors discovered that the connecting piece is prone to deformation under high temperatures during welding. This bending deformation makes it difficult to ensure precise contact between the connecting piece and the electrode during welding, thus affecting welding quality. Specifically, bending deformation of the connecting piece can lead to uneven contact surfaces in the welding area, creating gaps and resulting in poor contact. Poor contact leads to uneven heat distribution, resulting in weak or incomplete welds, thus affecting connection quality. Furthermore, bending deformation of the connecting piece changes the relative position between the electrode and the connecting piece, making precise positioning impossible. Inaccurate positioning of the connecting piece and electrode during welding can cause weld point misalignment, leading to unsatisfactory welding results and affecting yield. Additionally, high temperatures cause uneven heating of the bent connecting piece, further exacerbating bending deformation and resulting in uneven heat conduction at the welding point with the electrode. This leads to improper temperature control during welding, further affecting weld quality. Bending deformation of the connecting piece also causes uneven contact pressure during welding. This uneven pressure inevitably affects weld strength, and unstable weld strength reduces the success rate of welding. Therefore, bending and deformation of the connecting piece can lead to problems such as poor contact, positioning errors, and uneven heat sources during the subsequent welding of the tabs, thereby reducing the yield of the welded tabs and affecting the final battery performance and safety.

[0025] like Figure 1 As shown, this utility model proposes a leveling fixture for a circular battery top cover connecting piece, comprising: a first template 1 and a second template 2, which are interlocked for leveling the product (i.e., the connecting piece). The product's circumferential array before leveling has several positioning holes; in this embodiment, each product has three positioning holes.

[0026] like Figure 2 , Figures 5-6As shown, several sets of concave and convex structures are provided between the first template 1 and the second template 2. The concave and convex structures are used to press the product to form reinforcing ribs, and the positioning holes are located on the reinforcing ribs.

[0027] Specifically, such as Figures 3-4 As shown, each set of concave-convex structures includes multiple grooves 3 and multiple punches 5, and the number of grooves 3 and punches 5 is the same as the number of positioning holes in a single product. The grooves 3 are formed on the top of the first template 1, and the punches 5 are located on the bottom of the second template 2, with the positions of the grooves 3 and punches 5 corresponding one-to-one. It should be noted that in each set of concave-convex structures, the multiple grooves 3 are arranged circumferentially, forming a shape approximately similar to the product shape. Correspondingly, the multiple punches 5 in each set of concave-convex structures are also arranged circumferentially.

[0028] In each set of concave-convex structures, a positioning post 4 is provided between two adjacent grooves 3. The positioning post 4 is fixedly installed on the first template 1, and the shape of the positioning post 4 matches the shape of the positioning hole on the product, which facilitates positioning of the product before leveling. The second template 2 has several clearance grooves 6. In each set of concave-convex structures, a clearance groove 6 is provided between two adjacent punches 5 to prevent product damage. The positions of the positioning posts 4 correspond one-to-one with the positions of the clearance grooves 6.

[0029] In this embodiment, during use, the first template 1 is positioned above and the second template 2 is positioned below. The product before leveling is placed on the second template 2, and the positioning pin 4 passes through the positioning hole of the product, fixing the product at the first template 1. At this time, the product covers the groove 3. An external driving mechanism (including but not limited to a cylinder) moves the first template 1 downward until the first template 1 and the second template 2 are engaged. The punch 5 presses the product down towards the groove 3. At this time, the product changes shape, and the product partially fits into the groove 3. A reinforcing rib is formed between two adjacent engaged parts, and the product leveling is completed. Welding tabs onto the leveled connecting piece can effectively reduce problems such as poor contact, positioning error, and uneven heat source, thereby improving the yield of welding tabs onto the connecting piece and improving battery performance and safety. The first template 1 and the second template 2 effectively level the bent connecting piece through engagement, and at the same time press out the reinforcing ribs into the connecting piece. The reinforcing ribs can effectively reduce the deformation and bending of the connecting piece caused by external force, and improve the strength of the connecting piece.

[0030] Working principle: In use, the first template 1 is located above and the second template 2 is located below. The product before leveling is placed on the second template 2. The positioning pin 4 passes through the positioning hole of the product, fixing the product at the first template 1. At this time, the product covers the groove 3. The first template 1 is driven downward by an external cylinder until the first template 1 and the second template 2 are engaged. The punch 5 presses the product down towards the groove 3. At this time, the product changes shape and partially fits into the groove 3. Reinforcing ribs are formed between two adjacent fitting parts, and the product leveling is completed.

[0031] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A leveling fixture for a circular battery top cover connecting piece, characterized in that, include: The first template (1) and the second template (2) are interlocked. A plurality of concave and convex structures are provided between the first template (1) and the second template (2), the concave and convex structures being used to press the product to form reinforcing ribs.

2. The leveling fixture for the circular battery top cover connecting piece as described in claim 1, characterized in that, Each set of the concave-convex structure includes multiple grooves (3), which are formed on the top of the first template (1).

3. The leveling fixture for the circular battery top cover connecting piece as described in claim 2, characterized in that, Each set of the concave-convex structure includes multiple punches (5), which are disposed at the bottom of the second template (2).

4. The leveling fixture for the circular battery top cover connecting piece as described in claim 3, characterized in that, The position of the groove (3) corresponds one-to-one with the position of the punch (5).

5. The leveling fixture for the circular battery top cover connecting piece as described in claim 3, characterized in that, In each set of the concave and convex structures, a positioning post (4) is provided between two adjacent grooves (3).

6. The leveling fixture for the circular battery top cover connecting piece as described in claim 5, characterized in that, The positioning column (4) is fixedly installed on the first template (1).

7. The leveling fixture for the circular battery top cover connecting piece as described in claim 5, characterized in that, The second template (2) has several clearance slots (6).

8. The leveling fixture for the circular battery top cover connecting piece as described in claim 7, characterized in that, In each set of the concave and convex structures, the clearance groove (6) is provided between two adjacent punches (5).

9. The leveling fixture for the circular battery top cover connecting piece as described in claim 7, characterized in that, The position of the positioning post (4) corresponds one-to-one with the position of the clearance groove (6).

10. The leveling fixture for the circular battery top cover connecting piece as described in claim 5, characterized in that, The shape of the positioning post (4) is adapted to the shape of the positioning hole on the product.

Images