Electrode lug embossing roller and embossing mechanism

Abstract

The utility model discloses a tab embossing roller and an embossing mechanism, and relates to the technical field of lithium battery manufacturing. Comprising an embossing roller body, a plurality of strip-shaped embossing protruding strips and a plurality of embossing protruding points are arranged on the outer circumferential face of the embossing roller body, the embossing protruding strips are all arranged in the middle of the embossing roller body, and the embossing protruding points are divided into two parts and are arranged at the two ends of the outer circumferential face of the embossing roller body respectively. According to the electrode lug embossing roller and the embossing mechanism, the plurality of strip-shaped embossing convex strips are arranged at the middle position of the outer circumferential surface of the embossing roller, the plurality of embossing convex points are arranged at the two ends of the outer circumferential surface of the embossing roller, the embossing convex strips are in contact with the root part and the middle part of the electrode lug, and the embossing convex points are in concentrated contact with the vertex angle part of the electrode lug; roll pressing with different uniform stress is carried out on the middle root part and the vertex angle of the tab at the same time to improve the bending strength of the tab, so that the problems that the tab is folded and the vertex angle of the tab is easy to collapse and warp due to insufficient toughness of the root part of the tab are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to an ear embossing roller and an embossing mechanism for a lithium battery. Background Art

[0002] During the production process of batteries, due to their unique geometric shape and material properties, the ears are prone to deformation phenomena such as wrinkling, sagging, and bending when slightly disturbed by the outside world, resulting in reduced production efficiency and yield, and even having an adverse impact on the safety performance of the batteries. Therefore, improving the bending strength of the ears is of great significance for the production of wound lithium batteries.

[0003] At present, most manufacturers add an embossing roller at the roller position of the winding machine to alleviate this problem. However, since there are many types of battery products trial-produced on the pilot line, there are some differences in the thickness of the foil materials of different types of pole pieces. Using a common single-striped embossing roller device for embossing will cause problems such as ear bending and breakage, as well as sagging or flanging of the top corners, resulting in battery short circuits and reducing the production yield of the batteries. Summary of the Utility Model

[0004] The utility model provides an ear embossing roller and an embossing mechanism. By arranging a plurality of strip-shaped embossing ridges at the middle position of the outer circumferential surface of the embossing roller and a plurality of embossing bumps at both ends of the outer circumferential surface of the embossing roller, and making the embossing ridges contact the root and middle parts of the ears, and the embossing bumps concentrate on contacting the top corner parts of the ears, the ears are roll-pressed with different uniform forces at the root position and the top corner position at the same time to improve their bending strength, so as to solve the above technical problems.

[0005] The technical solution of the utility model to solve the above problems is: to provide an ear embossing roller, including an embossing roller, on which a plurality of strip-shaped embossing ridges and a plurality of embossing bumps are arranged on the outer circumferential surface. A plurality of embossing ridges are all arranged in the middle of the embossing roller, and a plurality of embossing bumps are divided into two parts and are respectively arranged at both ends of the outer circumferential surface of the embossing roller.

[0006] Further, the thickness of the embossing ridges is the same as that of the embossing bumps.

[0007] Further, a plurality of the embossing ridges are all axially arranged on the outer circumferential surface of the embossing roller.

[0008] Further, a plurality of the embossing ridges are equidistantly arranged on the outer circumferential surface of the embossing roller.

[0009] Further, a plurality of embossing bumps are evenly arranged on both sides of the embossing ridges.

[0010] Further, the embossing roller includes a roller barrel and a main shaft. The roller barrel is fixedly sleeved on the main shaft, and the embossing bumps and embossing ribs are correspondingly arranged on the outer circumferential surface of the roller barrel; the main shaft is in transmission connection with a driving device to drive the roller barrel to rotate.

[0011] Further, bearings are also arranged at both ends of the main shaft.

[0012] Further, the embossing bumps are spherical protrusions or cylindrical protrusions.

[0013] The present utility model also provides an embossing mechanism, which includes at least one of the tab embossing rollers described in any one of the above, and a driving device for rotating the at least one tab embossing roller.

[0014] Further, the embossing ribs are used to contact the root and middle part of the tab, and the embossing bumps are used to contact the top corner part of the tab.

[0015] Advantages of the present utility model:

[0016] For the tab embossing roller and the embossing mechanism of the present utility model, by combining vertical strip-shaped embossing ribs and circular or spherical embossing bumps and arranging them evenly in the middle part and both side parts of the outer circumferential surface of the roller barrel of the embossing roller, the embossing roller with this new structure not only solves the problem of folding of the tab root due to insufficient toughness, but also solves the problems of caving and curling of the tab top corner, and also saves the time required for repeatedly debugging and frequently disassembling and replacing the appropriate embossing roller during battery type change, greatly improving the production yield and efficiency. Description of the Drawings

[0017] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present utility model and are used together with the description to explain the principles of the present utility model. In these drawings, like reference numerals are used to represent like elements. The following drawings are some embodiments of the present utility model, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a front view schematic diagram of the overall structure of the tab embossing roller of this embodiment;

[0019] Figure 2 It is a top view schematic diagram of the overall structure of the tab embossing roller of this embodiment;

[0020] 1 - embossing rib, 2 - embossing bump, 3 - roller barrel, 4 - main shaft, 5 - bearing. Detailed Embodiment

[0021] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0022] See also Figure 1 and Figure 2 A specific embodiment of the utility model is an embossing roller for a pole ear. The embossing roller is a conventional cylinder. The embossing roller includes a roller 3 and a main shaft 4. The roller 3 is sleeved on the main shaft 4. Both ends of the main shaft 4 are sleeved with bearings 5. The main shaft 4 can be rotatably mounted on a mounting bracket of a related device through the bearings 5, so that when the main shaft 4 is correspondingly connected to the driving device for transmission, the driving device can easily drive the entire embossing roller to rotate, thereby shaping the pole ear.

[0023] In this embodiment, the driving device is a motor.

[0024] Furthermore, in the present embodiment, a plurality of embossed ridges 1 are provided in the middle region of the outer circumferential surface of the roller 3, the embossed ridges 1 are rectangular protrusions, and the plurality of embossed ridges 1 are integrally provided on the outer surface of the roller 3 along the central axis direction of the roller 3, and the spacing between any two adjacent embossed ridges 1 is equal; in addition, a plurality of embossed convex points 2 are provided at the two end regions of the outer circumferential surface of the roller 3, and the plurality of embossed convex points 2 are evenly distributed on the outer circumferential surface of the roller 3.

[0025] Correspondingly, when the driving device drives the embossing roller of this embodiment to rotate and transmit the pole ear to the embossing roller position, the embossing ridge 1 in the middle of the roller 3 directly contacts the root and the middle of the pole ear, and the embossing ridge 2 contacts the top corner of the pole ear, so as to release pressure to two different degrees and shape the root and top corner of the pole ear in two different shapes, respectively, so as to effectively improve the structural strength of the pole ear, thereby solving the problem of the pole ear folding and the top corner of the pole ear easily collapsing and warping during embossing due to insufficient toughness of the root of the pole ear.

[0026] In this embodiment, the embossed protrusions 2 are configured as spherical protrusions; however, in other embodiments, the embossed protrusions 2 may also be configured as cylindrical protrusions.

[0027] In addition, in order to ensure that both the embossed convex strips 1 and the embossed convex points 2 can be formed into tabs, the convex thickness of the embossed convex strips 1 on the roller 3 and the convex thickness of the embossed convex points 2 on the roller 3 are the same.

[0028] In addition, a specific embodiment of the present utility model further includes an embossing mechanism, which includes an ear embossing roller described in any section of the above embodiments and a driving device for driving the ear embossing roller to rotate around the axis of the main shaft 4.

[0029] In this embodiment, the driving device is a motor.

[0030] In addition, in other embodiments, the number of ear embossing rollers provided in the embossing mechanism can be two or even more. Each embossing roller can be driven to rotate by a motor respectively, or can be driven to rotate by one or a few motors, and power is transmitted between the embossing rollers through a transmission mechanism such as a gear transmission mechanism or a belt pulley transmission mechanism, so that each embossing roller can perform embossing operations on multiple ears at different positions respectively, thereby improving the embossing operation efficiency of the ears.

[0031] Matters not mentioned above are all applicable to the prior art.

[0032] Finally, it should be noted that the above 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 recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A tab embossing roller, characterized in that: The invention comprises an embossing roller, wherein a plurality of strip-shaped embossing convex strips (1) and a plurality of embossing convex points (2) are arranged on the outer circumferential surface of the embossing roller, wherein the plurality of embossing convex strips (1) are arranged in the middle of the embossing roller, and the plurality of embossing convex points (2) are divided into two parts and are respectively arranged at the two ends of the outer circumferential surface of the embossing roller.

2. The tab embossing roller according to claim 1, characterized in that: The thickness of the embossed convex strip (1) is the same as the thickness of the embossed convex point (2).

3. The tab embossing roller according to claim 1, characterized in that: The plurality of embossing convex strips (1) are all axially arranged on the outer circumferential surface of the embossing roller.

4. The tab embossing roller according to claim 3, characterized in that: A plurality of the embossing convex strips (1) are arranged at equal intervals on the outer circumferential surface of the embossing roller.

5. The tab embossing roller according to claim 1, characterized in that: A plurality of embossed convex points (2) are evenly arranged on both sides of the embossed convex strip (1).

6. The tab embossing roller according to claim 1, characterized in that: The embossing roller comprises a roller (3) and a main shaft (4); the roller (3) is fixedly sleeved on the main shaft (4); the embossing convex points (2) and the embossing convex strips (1) are correspondingly arranged on the outer circumferential surface of the roller (3); and the main shaft (4) is transmission-connected to a driving device to drive the roller (3) to rotate.

7. The tab embossing roller according to claim 6, characterized in that: Bearings (5) are also provided at both ends of the main shaft (4).

8. The tab embossing roller according to claim 1, characterized in that: The embossed convex points (2) are spherical convexities or cylindrical convexities.

9. An embossing mechanism, characterized in that: The method comprises at least one tab embossing roller according to any one of claims 1 to 8, and a driving device for rotating the at least one tab embossing roller.

10. The embossing mechanism according to claim 9, characterized in that: The embossed convex strip (1) is used to contact the root and middle of the pole lug, and the embossed convex point (2) is used to contact the top corner of the pole lug.

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