Tab welding device

Abstract

The utility model belongs to the technical field of battery cell manufacturing, and discloses a pole lug welding device which comprises a battery cell conveying assembly, a welding assembly and a guiding piece, and the battery cell conveying assembly is used for conveying a battery cell to a welding station; the guiding part and the welding assembly are located on the same side of the battery cell conveying assembly and distributed in the conveying direction of the battery cell conveying assembly, the guiding part is located in front of the welding assembly, and the thickness of the guiding part is increased in the conveying direction of the battery cell conveying assembly. A battery cell is placed on the battery cell conveying assembly, a pole lug on the battery cell extends out of the battery cell conveying assembly, the pole lug passes through the guide part in the process that the battery cell conveying assembly moves the battery cell to a welding station, the pole lug is folded upwards under the guide of the guide part, and the phenomenon that the pole lug is dispersed due to drooping under the action of gravity is avoided; and therefore, the tab is prevented from being folded in the welding process, and the welding quality of the tab is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery cell manufacturing technology, and in particular to a tab welding device. Background Technology

[0002] Multi-tab cells are a common type of battery cell with relatively low internal resistance. One type of multi-tab cell has an electrode structure consisting of foil electrodes and metal strip electrodes. Taking a wound multi-tab cell as an example, the electrode sheet includes a main body and multiple foil electrodes. The foil electrodes are connected to the same end of the main body and spaced apart along the length of the electrode sheet. After the electrode sheet is wound, the multiple foil electrodes on the electrode sheet are stacked on top of each other. After the multiple foil electrodes are stacked, the metal strip electrodes and foil electrodes can be welded together, as well as the stacked foil electrodes can be welded together, using welding methods such as ultrasonic welding and laser welding.

[0003] The materials of battery cell tabs are generally copper foil and aluminum foil, and there are many layers of tabs. Before entering the welding station, the multi-layer tabs of the battery cell sag due to gravity, causing the multi-layer tabs to be too scattered. They are prone to deformation and folding during the welding process, thus affecting the welding quality of the tabs. Utility Model Content

[0004] The purpose of this invention is to provide a tab welding device that can prevent the tab from folding during the welding process and ensure the welding quality of the tab.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Electrode welding apparatus, comprising:

[0007] A cell delivery assembly is used to deliver battery cells to the welding station;

[0008] A welding assembly is located on one side of the cell delivery assembly;

[0009] A guide member is located on the same side of the cell delivery assembly as the welding assembly. The guide member and the welding assembly are distributed sequentially along the delivery direction of the cell delivery assembly. The thickness of the guide member increases along the delivery direction of the cell delivery assembly. The guide member includes a first surface and a second surface that are arranged opposite to each other along the thickness direction. The second surface is located on the side of the first surface away from the cell delivery assembly. Along the delivery direction of the cell delivery assembly, at least a portion of the second surface is a first inclined surface that is inclined in a direction away from the first surface.

[0010] The beneficial effects of this utility model are:

[0011] The electrode welding device provided by this utility model has the battery cell placed on the battery cell conveying assembly, and the electrode tabs on the battery cell extending beyond the battery cell conveying assembly. During the process of the battery cell conveying assembly moving the battery cell to the welding station, the electrode tabs pass through the guide member. Under the guidance of the guide member, the electrode tabs are brought together upwards, avoiding the electrode tabs from sag due to gravity and thus preventing the electrode tabs from folding during the welding process, ensuring the welding quality of the electrode tabs. Attached Figure Description

[0012] Figure 1 This is a first-view structural schematic diagram of the electrode welding device provided in an embodiment of the present invention;

[0013] Figure 2 This is a second-view structural schematic diagram of the electrode welding device provided in this embodiment of the utility model;

[0014] Figure 3 This is a first-view structural schematic diagram of the electrode welding device provided in this embodiment of the utility model, with some parts of the structure hidden.

[0015] Figure 4 This is a second-view structural schematic diagram of the electrode welding device provided in this embodiment of the present invention, with some parts of the structure hidden.

[0016] Figure 5 This is a schematic diagram of the structure of the guide component, welding assembly, and clamping assembly involved in the embodiments of this utility model;

[0017] Figure 6 This is a schematic diagram of the structure of the guide component involved in the embodiments of this utility model;

[0018] Figure 7 This is a top view of the guide component involved in the embodiments of this utility model;

[0019] Figure 8 This is a top view of the guide, welding seat, and lower pressure plate involved in the embodiments of this utility model.

[0020] In the picture:

[0021] 10. Cell delivery assembly; 21. Welding base; 22. Welding head; 30. Guide component; 31. First side; 32. Second side; 321. Inclined section; 322. Straight section; 33. Fixing component; 40. Mounting base; 51. Upper pressure plate; 511. Boss part; 5111. Clearance notch; 512. Upper clamping part; 52. Lower pressure plate; 521. Lower clamping part; 60. Control box; 70. Mounting bracket; 80. Drive mechanism; 91. Slide rail; 92. Sliding component;

[0022] 100. Battery cell; 101. Electrode. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] like Figures 1 to 8 As shown, this embodiment of the utility model provides a tab welding device, including a cell conveying assembly 10, a welding assembly, and a guide 30. The cell conveying assembly 10 is used to convey the cell 100 to the welding station. The conveying direction of the cell conveying assembly 10 is referenced to... Figure 1 and Figure 3As indicated by the arrows in the diagram; the welding assembly is located on one side of the cell delivery assembly 10; the guide 30 and the welding assembly are located on the same side of the cell delivery assembly 10, and the guide 30 and the welding assembly are distributed sequentially along the delivery direction of the cell delivery assembly 10. The thickness of the guide 30 increases along the delivery direction of the cell delivery assembly 10. The guide 30 includes a first surface 31 and a second surface 32 that are arranged opposite to each other along the thickness direction. The second surface 32 is located on the side of the first surface 31 that is away from the cell delivery assembly 10. Along the delivery direction of the cell delivery assembly 10, at least a portion of the second surface 32 is a first inclined surface that is inclined in the direction away from the first surface 31. The battery cell 100 is placed on the battery cell conveying assembly 10, and the tabs 101 on the battery cell 100 extend beyond the battery cell conveying assembly 10. During the process of moving the battery cell 100 to the welding station, the tabs 101 pass through the guide member 30. Under the guidance of the guide member 30, the tabs 101 are brought together upward, which avoids the tabs 101 from sag due to gravity and thus avoids the tabs 101 from folding during the welding process, ensuring the welding quality of the tabs 101.

[0028] In this embodiment, refer to Figure 6 and Figure 7 The second surface 32 of the guide member 30 includes an inclined section 321 and a straight section 322, with the straight section 322 connected to the end of the inclined section 321 near the welding assembly. The portion of the guide member 30 corresponding to the inclined section 321 forms a closing section, which is used to close the tab 101. The portion of the guide member 30 corresponding to the straight section 322 forms a guide section, which is used to guide the closed tab 101, so that the dispersed tab 101 is smoothly closed and moves smoothly to the welding station.

[0029] In this embodiment, we continue to refer to... Figure 6 and Figure 7 The portion of the upper surface of the guide member 30 corresponding to the inclined section 321 is a second inclined surface. The height of the second inclined surface gradually increases along the conveying direction of the cell conveying assembly 10. The portion of the upper surface of the guide member 30 corresponding to the straight section 322 is a plane parallel to the conveying direction of the cell conveying assembly 10. The guide member 30 gradually increases in height along the conveying direction of the cell conveying assembly 10. The end of the guide member 30 that first contacts the tab 101 is positioned lower, making it easier to extend under the tab 101 and less likely to interfere with the drooping and dispersed tab 101, thus facilitating the gathering of the tab 101.

[0030] In this embodiment, refer to Figures 3 to 5 and combined Figure 8 The welding assembly includes a welding base 21 and a welding head 22. The electrode tab 101 moves onto the welding base 21 after passing through the guide member 30. The welding head 22 is used to weld the electrode tab 101 on the welding base 21. Figure 8As shown, along the conveying direction perpendicular to the cell conveying assembly 10, the distance A from the straight section 322 protruding from the outer side of the solder pad 21 is denoted as A. The distance B between the straight section 322 and the solder pad 21 along the conveying direction of the cell conveying assembly 10 is denoted as B. The ratio of A to B ranges from 0.5 to 1. If the ratio of A to B is too small, the tab 101 is prone to colliding with the solder pad 21, potentially causing the tab 101 to fold. If the ratio of A to B is too large, the tab 101 may wobble due to the large drop when moving onto the solder pad 21, still posing a risk of folding. Therefore, by setting the ratio of A to B to 0.5-1, the folding of the tab 101 can be effectively prevented.

[0031] In this embodiment, the range of A is 0-2.5mm. When the tab 101 moves from the guide 30 to the soldering base 21, if the straight section 322 is concave to the outer side of the soldering base 21, the tab 101 is prone to colliding with the soldering base 21 during its movement, which may cause the tab 101 to fold. If the straight section 322 is flush with the outer side of the soldering base 21, there is still a risk of collision due to the gap between them. Therefore, by setting the straight section 312 to protrude from the outer side of the soldering base 21, and setting the protrusion distance range A to 0-2.5mm, the collision between the tab 101 and the soldering base 21 during its movement can be effectively avoided. The range of B is 0-3mm, which can effectively prevent the tab 101 from colliding with the soldering base 21 during its movement.

[0032] In this embodiment, the distance between the two ends of the first inclined surface along the thickness direction of the guide member 30 is 2.5mm-8mm. In this embodiment, the length of the first inclined surface is greater than 30mm. In this embodiment, the inclination angle of the first inclined surface is less than 60 degrees. With the above settings, the tab 101 can be retracted at a suitable speed, and the retraction effect is good.

[0033] In this embodiment, the upper surface of the guide member 30 is 0-2mm above the upper surface of the solder base 21. If the height of the upper surface of the guide member 30 is lower than the height of the upper surface of the solder base 21, the tab 101 is prone to collide with the solder base 21 during its movement, which may cause the tab 101 to fold over. Therefore, by setting the upper surface of the guide member 30 to be 0-2mm above the upper surface of the solder base 21, the folding of the tab 101 can be avoided.

[0034] In this embodiment, a fixing member 33 is provided at the lower end of the guide member 30, and the fixing member 33 is connected to the mounting base 40. With the above arrangement, the shape of the fixing member 33 is not affected by the guide member 30, and the fixing member 33 can be set as a conventional structure of uniform thickness to facilitate the connection between the fixing member 33 and the mounting base 40.

[0035] Furthermore, referring to Figures 3 to 5The electrode welding device provided in this embodiment also includes a clamping assembly, which includes an upper pressure plate 51 and a lower pressure plate 52. The lower pressure plate 52 is fixedly disposed between the welding seat 21 and the cell delivery assembly 10, and the upper pressure plate 51 is movably disposed above the lower pressure plate 52. The upper pressure plate 51 is used to press the electrode 101 between the upper pressure plate 51 and the lower pressure plate 52. By setting the clamping assembly, the electrode 101 can be further gathered and fixed, which facilitates the welding head 22 to weld the electrode 101.

[0036] In this embodiment, the upper pressure plate 51 includes a boss portion 511 and an upper clamping portion 512. The upper clamping portion 512 is disposed at the lower end of the boss portion 511 and is used to fix the electrode tab 101 together with the lower pressure plate 52. The boss portion 511 is provided with an avoidance notch 5111, which is used to avoid the welding head 22. By providing the boss portion 511 and the avoidance notch 5111 on the boss portion 511, it is possible to ensure that the welding head 22 is aligned with the welding position, and the weight of the upper pressure plate 51 is increased, thereby increasing the downward pressure of the upper pressure plate 51 to more firmly clamp the electrode tab 101.

[0037] In this embodiment, the lower pressure plate 52 includes a lower clamping part 521, which together with the upper clamping part 512 fixes the tab 101. Both the upper clamping part 512 and the lower clamping part 521 are designed with pointed tips to precisely press the root of the tab 101.

[0038] In this embodiment, refer to Figure 1 and Figure 2 The upper pressure plate 51 is driven to rise and fall by a drive mechanism 80, which is mounted on a mounting frame 70. The mounting frame 70 is mounted on a control box 60, which controls the cell delivery assembly 10, the welding assembly, and the clamping assembly. The overall structure is simple and compact. Furthermore, the electrode welding device also includes a guide assembly for guiding the rising and falling of the upper pressure plate 51. In this embodiment, the guide assembly includes a slide rail 91 and a sliding member 92. The slide rail 91 is mounted on the mounting frame 70, and the sliding member 92 is slidably mounted on the slide rail 91. The sliding member 92 is connected to the upper pressure plate 51 to make the rising and falling of the upper pressure plate 51 more stable.

[0039] The working principle of the electrode welding device provided in this embodiment is as follows: the battery cell 100 is placed on the battery cell conveying assembly 10, and the battery cell conveying assembly 10 moves with the battery cell 100. The electrode 101 on the battery cell 100 first passes through the guide member 30, and is then gathered upward by the gathering part of the guide member 30 and then guided by the guide part to the welding seat 21. After that, the upper pressure plate 51 moves down and together with the lower pressure plate 52 clamps the root of the electrode 101. After clamping, the welding head 22 welds the electrode 101.

[0040] In this embodiment, the welding assembly, the guide 30 and the clamping assembly constitute the tab welding assembly. There are two tab welding assemblies, which are symmetrically arranged on both sides of the cell delivery assembly 10 to improve the welding efficiency of the tab 101.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A tab welding apparatus characterized by, include: A cell delivery assembly (10) is used to deliver the cell (100) to the welding station; A welding assembly is located on one side of the cell delivery assembly (10); The guide (30) is located on the same side of the cell delivery assembly (10) as the welding assembly. The guide (30) and the welding assembly are distributed sequentially along the delivery direction of the cell delivery assembly (10). The thickness of the guide (30) increases along the delivery direction of the cell delivery assembly (10). The guide (30) includes a first surface (31) and a second surface (32) arranged opposite to each other along the thickness direction. The second surface (32) is located on the side of the first surface (31) away from the cell delivery assembly (10) along the delivery direction of the cell delivery assembly (10). At least a portion of the second surface (32) is a first inclined surface that is inclined in a direction away from the first surface (31).

2. The tab welding apparatus of claim 1, wherein The second surface (32) includes an inclined section (321) and a straight section (322), the straight section (322) being connected to one end of the inclined section (321) near the welding assembly.

3. The tab welding apparatus of claim 2, wherein The portion of the upper surface of the guide member (30) corresponding to the inclined section (321) is a second inclined surface. The height of the second inclined surface gradually increases along the conveying direction of the cell conveying assembly (10). The portion of the upper surface of the guide member (30) corresponding to the straight section (322) is a plane.

4. The tab welding apparatus according to claim 2 or 3, characterized by The welding assembly includes a welding base (21) and a welding head (22). Along the conveying direction perpendicular to the cell conveying assembly (10), the straight section (322) protrudes from the outer side of the welding base (21) by a distance A. Along the conveying direction of the cell conveying assembly (10), the distance between the straight section (322) and the welding base (21) is B. The ratio of A to B is in the range of 0.5-1.

5. The tab welding apparatus of claim 4, wherein The range of A is 0-2.5mm, and the range of B is 0-3mm.

6. The tab welding apparatus according to any one of claims 1 to 3, characterized by Along the thickness direction of the guide (30), the distance between the two ends of the first inclined surface is 2.5mm-8mm.

7. The tab welding apparatus of claim 4, wherein The distance between the upper surface of the guide (30) and the upper surface of the welding base (21) is 0-2 mm.

8. The tab welding apparatus according to any one of claims 1 to 3, characterized by The electrode welding device also includes a mounting base (40), and a fixing member (33) is provided at the lower end of the guide member (30), and the fixing member (33) is installed on the mounting base (40).

9. The tab welding apparatus of claim 4, wherein The electrode welding device further includes a clamping assembly, which includes an upper pressure plate (51) and a lower pressure plate (52). The lower pressure plate (52) is fixedly disposed between the welding base (21) and the cell delivery assembly (10). The upper pressure plate (51) is vertically disposed above the lower pressure plate (52). The upper pressure plate (51) is used to press the electrode (101) between the upper pressure plate (51) and the lower pressure plate (52).

10. The tab welding apparatus of claim 9, wherein The upper pressure plate (51) includes a boss (511) and an upper clamping part (512). The upper clamping part (512) is disposed at the lower end of the boss (511). The upper clamping part (512) is used to fix the electrode tab (101) together with the lower pressure plate (52). The boss (511) is provided with a clearance notch (5111). The clearance notch (5111) is used to avoid the welding head (22) in the welding assembly.

11. The tab welding apparatus of claim 9, wherein The welding assembly, the guide (30) and the clamping assembly constitute a tab welding assembly. There are two tab welding assemblies, which are symmetrically arranged on both sides of the cell delivery assembly (10).

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