Tab welding tool for direct welding process

Abstract

The utility model discloses a pole lug welding tool for a direct welding process, which comprises two battery cell feeding platforms, a pole lug shaping structure and a welding protection module, and the two battery cell feeding platforms are respectively positioned on two sides of the pole lug shaping structure; the welding protection module is located above the tab shaping structure and is a set distance away from the tab shaping structure, a battery cell is placed on the battery cell feeding platform, a tab on the battery cell is placed towards the tab shaping structure, and the tab shaping structure shapes the tab on the battery cell; the tab welding tool provided by the utility model can be used in a straight welding process, the tab can be compacted and shaped to an optimal state before laser welding through the tab shaping structure, and compared with the prior art, the process of ultrasonic pre-welding and shaping is omitted, the cost of the whole line equipment is reduced, and the production efficiency is improved. Meanwhile, states such as the eccentric distance of the tabs can be adjusted according to needs, and the device is suitable for various types of battery cells.

Description

Technical Field

[0001] The utility model belongs to the technical field of pole tab welding auxiliary devices, and in particular relates to a pole tab welding tool used in a direct welding process. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In the current production process of lithium batteries, welding is an indispensable part of the assembly process. Different forms of welding are used in different processes. Ultrasonic and laser welding have derived a new welding process in the welding of the tabs, called direct welding. In the direct welding process, the tabs need to be ultrasonically pre-welded before they can be laser-welded with the adapter. This step will increase the production cycle and reduce production capacity in the production process. If the pre-welding and shaping are cancelled and laser welding is performed directly, the initial state of the tabs will be very strict. Due to multiple processing in the previous process, the tabs may be skewed, twisted and other undesirable conditions. If the initial state of the tabs is not good, it is very easy to have poor eccentricity, misaligned tabs, large tab gaps and other defects after welding. In the subsequent core assembly and shelling, the tabs will tear, and the pole pieces will be bent and exceed the cover plate to cause short circuits, which seriously affect the performance of the battery and increase the process loss. Utility Model Content

[0004] The utility model aims to provide a tab welding tool for direct welding process, which can compact and shape the tab to an optimal state before laser welding, and can also adjust the tab eccentricity and other states as needed, and is suitable for various types of battery cells.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] In the first aspect, an embodiment of the utility model provides a tab welding tool for a direct welding process, comprising a battery cell loading platform, a tab shaping structure and a welding protection module, wherein two battery cell loading platforms are provided, respectively located on both sides of the tab shaping structure, the welding protection module is located above the tab shaping structure and at a set distance from the tab shaping structure, the battery cell is placed on the battery cell loading platform, the tabs on the battery cell are placed toward the tab shaping structure, and the tab shaping structure shapes the tabs on the battery cell.

[0007] As a further technical solution, the battery cell loading platform is a rectangular plate, and a groove is provided on the upper surface of the battery cell loading platform, and the size of the groove matches the size of the battery cell.

[0008] As a further technical solution, the tab shaping structure is a rectangular plate, and two pressing knives are provided on the two side surfaces of the tab shaping structure adjacent to the battery cell loading platform.

[0009] As a further technical solution, the two pressing knives are spaced a certain distance apart, and each pressing knife corresponds to the position of a tab on the battery cell.

[0010] As a further technical solution, the pressing knife is detachably mounted on the tab shaping structure.

[0011] As a further technical solution, the welding protection module is an I-shaped plate, and the upper surface of the welding protection module is connected to the cylinder through a connecting rod and a connecting plate.

[0012] As a further technical solution, the welding protection module is provided with a long hole.

[0013] As a further technical solution, four elongated holes are provided, and each elongated hole corresponds to the position of a pole ear.

[0014] As a further technical solution, after the battery cell is placed on the battery cell loading platform, a pressing plate is used above the battery cell to press and fix the battery cell.

[0015] As a further technical solution, the battery cell loading platform, the tab shaping structure and the welding protection module have the same length.

[0016] The beneficial effects of the above-mentioned embodiments of the utility model are as follows:

[0017] The pole ear welding tool provided by the utility model can be used in the direct welding process. The pole ear shaping structure provided can compact and shape the pole ear to an optimal state before laser welding. Compared with the prior art, the process of ultrasonic pre-welding and shaping is omitted, and the cost of the whole line equipment is reduced. At the same time, the eccentricity of the pole ear and other states can be adjusted according to needs, and it is suitable for various types of battery cells.

[0018] The pole lug welding tool provided by the utility model can prevent the pole lug from shifting during the pole lug shaping process by arranging a groove on the battery cell feeding platform so that the battery cell is fixed in the groove, thereby improving the pole lug welding quality; in addition, by arranging battery cell feeding platforms on both sides of the pole lug shaping structure, the pole lugs on two battery cells can be welded simultaneously, thereby improving work efficiency.

[0019] The utility model provides a tab welding tool, in which the welding protection module is driven by a cylinder to move up and down, and the cylinder controls the welding protection module to press the tab up and down, and a certain distance is retained between the press margin and the pressing knife, so that the rounded corner of the tab can be retained when the tab is pressed, thereby preventing the tab from being crushed and affecting the performance of the battery; in addition, the long strip holes arranged on the welding protection module can provide a welding path for the laser, thereby preventing the battery cell from being burned when the laser path is offset. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of the tab welding tooling used in the direct welding process of the utility model;

[0022] Figure 2 It is a schematic diagram of the battery cell loading platform of the utility model;

[0023] Figure 3 It is a schematic diagram of the tab shaping structure of the utility model;

[0024] Figure 4 It is a schematic diagram of the welding protection module of the utility model;

[0025] Figure 5 It is a schematic diagram of the tab welding tool of the utility model when in use.

[0026] The schematic diagram is for illustrative purposes only;

[0027] Among them, 1. Battery cell loading platform; 2. Tab shaping structure; 201. First pressing knife; 202. Second pressing knife; 203. Third pressing knife; 204. Fourth pressing knife; 3. Welding protection module; 4. Cylinder. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] Example 1

[0030] In a typical implementation of the present invention, Figure 1As shown, a tab welding tool for a direct welding process is provided, including a battery cell feeding platform 1, a tab shaping structure 2 and a welding protection module 3, wherein two battery cell feeding platforms 1 are provided, respectively located on both sides of the tab shaping structure 2, the welding protection module 3 is located above the tab shaping structure and at a set distance from the tab shaping structure 2, a battery cell is placed on the battery cell feeding platform 1, and the tabs on the battery cell are placed toward the tab shaping structure 2, and the tab shaping structure shapes the tabs on the battery cell.

[0031] like Figure 1 As shown, the battery cell loading platform 1 is a rectangular plate, and a groove is provided on the upper surface of the battery cell loading platform 1. The size of the groove matches the size of the battery cell. After the battery cell is placed on the battery cell loading platform, the battery cell is pressed and fixed by a pressure plate above the battery cell to prevent the battery cell from moving during welding.

[0032] like Figure 2 As shown, the pole ear shaping structure 2 is a rectangular plate, and the pole ear shaping structure also serves as a pole ear welding platform. Two pressing knives are arranged on the two sides of the pole ear shaping structure 2 adjacent to the battery cell loading platform, specifically, including a first pressing knife 201, a second pressing knife 202, a third pressing knife 203 and a fourth pressing knife 204, wherein the first pressing knife 201 and the second pressing knife 202 are located on the same side, and the third pressing knife 203 and the fourth pressing knife 204 are located on the same side, further, the first pressing knife 201 and the second pressing knife 202 are separated by a certain distance, the third pressing knife 203 and the fourth pressing knife 204 are separated by a certain distance, and each pressing knife corresponds to the position of the pole ear on the battery cell, and the pole ear on the battery cell is shaped by the set pressing knife, and the pressing knife adopts the existing structure.

[0033] Furthermore, the pressing tool is detachably mounted on the tab shaping structure, and the distance between the pressing tool and the battery cell can be changed by changing the type of the pressing tool. The eccentricity of the tab can be adjusted by changing the position of the pressing tool, which is suitable for tabs of different lengths, widths and thicknesses.

[0034] like Figure 4 As shown, the welding protection module 3 is an I-shaped plate, and the upper surface of the welding protection module is connected to the cylinder through a connecting rod and a connecting plate. An important reason why the tabs need to be pre-shaped by ultrasonic welding in the direct welding process is that the gap between the tabs is required to be high, so in the embodiment Figure 5 The welding protection module is provided with a cylinder-controlled up and down pressing function for the pole ear. The pressing margin is kept at a certain distance from the pressing knife in order to retain the rounded corners of the pole ear when the pole ear is pressed, so as to prevent the pole ear from being crushed.

[0035] Furthermore, the welding protection module 3 is provided with a long strip hole. Since a long strip welding mark is used during direct welding, a long strip hole for the laser path during tab welding is also reserved on the welding protection module in this embodiment to prevent the battery cell from being burned when the laser path is offset.

[0036] Furthermore, four elongated holes are provided, and each elongated hole corresponds to the position of a pole lug.

[0037] In this embodiment, the cell loading platform 1 , the tab shaping structure 2 and the welding protection module 3 are of the same length.

[0038] When using, Figure 5 As shown, two battery cells are placed on two battery cell loading platforms respectively by means of clamps, and the battery cells are pressed and fixed by a pressing plate to prevent the battery cells from shifting during the shaping of the tabs. A suitable pressing knife model is selected and the position of the pressing knife is adjusted as needed, and the tabs on the battery cells are pressed down by the pressing knife to deform them; the cylinder drives the welding protection module to move down to a suitable position to compact the tabs, and the laser passes through the long holes on the welding protection module to weld the tabs.

[0039] The tab welding tooling provided in this embodiment compacts and shapes the tab to an optimal state before laser welding, eliminating the ultrasonic pre-welding shaping process compared to the prior art, reducing the cost of the entire line equipment, and can also adjust the tab eccentricity and other states as needed, and is suitable for various types of battery cells.

[0040] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tab welding tool for direct welding process, characterized in that: It includes a battery cell loading platform, a pole lug shaping structure and a welding protection module. Two battery cell loading platforms are provided, which are respectively located on both sides of the pole lug shaping structure. The welding protection module is located above the pole lug shaping structure and is a set distance away from the pole lug shaping structure. The battery cell is placed on the battery cell loading platform, and the pole lug on the battery cell is placed toward the pole lug shaping structure. The pole lug shaping structure shapes the pole lug on the battery cell.

2. The tab welding tool for direct welding process according to claim 1, characterized in that: The battery cell loading platform is a rectangular plate, and a groove is arranged on the upper surface of the battery cell loading platform, and the size of the groove matches the size of the battery cell.

3. The tab welding tool for direct welding process according to claim 1, characterized in that: The tab shaping structure is a rectangular plate, and two pressing knives are arranged on two side surfaces of the tab shaping structure adjacent to the battery cell loading platform.

4. The tab welding tool for direct welding process according to claim 3, characterized in that: The two pressing knives are spaced a certain distance apart, and each pressing knife corresponds to the position of a tab on the battery cell.

5. The tab welding tool for direct welding process according to claim 3, characterized in that: The pressing knife is detachably mounted on the tab shaping structure.

6. The tab welding tool for direct welding process according to claim 1, characterized in that: The welding protection module is an I-shaped plate, and the upper surface of the welding protection module is connected to the cylinder through a connecting rod and a connecting plate.

7. The tab welding tool for direct welding process according to claim 6, characterized in that: The welding protection module is provided with a long hole.

8. The tab welding tool for direct welding process according to claim 7, characterized in that: There are four elongated holes, each of which corresponds to the position of a pole ear.

9. The tab welding tool for direct welding process according to claim 1, characterized in that: After the battery cell is placed on the battery cell loading platform, the battery cell is pressed and fixed by a pressing plate above the battery cell.

10. The tab welding tool for direct welding process according to claim 1, characterized in that: The battery cell loading platform, the tab shaping structure and the welding protection module have the same length.

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