Tab structure and welding tool

Abstract

The utility model provides a pole lug structure and welding frock, pole lug structure includes a plurality of pole lug units that stack up pre-welded together, pole lug structure includes first end face and second end face that sets up oppositely, first end face is used for connecting with the welding head, second end face is connected with the welding station, and the first end face is used for connecting with the welding station. The difference value between the highest point and the lowest point of the metallographic section of the first end face in the first direction is H1, the difference value between the highest point and the lowest point of the metallographic section of the second end face in the first direction is H2, and H1 is smaller than or equal to H2. By means of the technical scheme, the technical problems in the prior art during prewelding can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tab structures, and particularly relates to a tab structure and a welding tooling. Background Art

[0002] During the battery production and manufacturing process, the welding of multiple tabs is an important process in the battery production process, and the welding process of multiple tabs is particularly important. In the traditional welding process, multiple tabs are pre-welded by ultrasonic welding first. However, during the pre-welding process, the welding head of ultrasonic welding is usually a sharp-tooth structure, which will damage the surface of the tab structure after welding, resulting in poor flatness of the tab structure surface, thus being not conducive to subsequent welding of the tab with other components and unable to meet the welding requirements of the tab. Summary of the Utility Model

[0003] An embodiment of the utility model provides a tab structure and a welding tooling, which can improve the technical problems during pre-welding in the related art.

[0004] In a first aspect, an embodiment of the utility model provides a tab structure. The tab structure includes a plurality of tab units stacked and pre-welded together. The tab structure includes a first end face and a second end face arranged oppositely. The difference between the highest point and the lowest point of the metallographic cross-section of the first end face in the first direction is H1, and the difference between the highest point and the lowest point of the metallographic cross-section of the second end face in the first direction is H2, and H1≤H2.

[0005] In one embodiment, H1≤0.11mm.

[0006] In one embodiment, 0.05mm≤H2≤0.3mm.

[0007] In a second aspect, an embodiment of the utility model provides a welding tooling. The welding tooling is used to stack and weld a plurality of tab units into the tab structure as described above. The first end face of the tab structure is used to abut against the welding head, and the second end face of the tab structure is used to abut against the welding table.

[0008] In one embodiment, the welding tooling includes: a welding head having welding teeth for connecting with the first end face of the tab structure; a welding table for connecting with the second end face of the tab structure; wherein, the welding teeth are flat-tooth structures.

[0009] In one embodiment, the surface roughness of the welding teeth is Sa, and 10μm≤Sa≤85μm.

[0010] In one embodiment, the height of the welding teeth in the first direction is H3, and H3≤100μm.

[0011] In one embodiment, the area of the region of the welding head is S1, and the area of the region of the welding teeth is S2, and 60%≤S2∶S1≤90%.

[0012] In one embodiment, 15 mm2 ≤ S2 ≤ 600 mm 2 .

[0013] In one embodiment, 24 mm2 ≤ S1 ≤ 780 mm 2 .

[0014] Applying the technical solution of the present utility model, the first end face of the tab structure is connected to the welding head, and the second end face of the tab structure is connected to the welding table. After welding, due to the high flatness of the welding table, and the difference between the highest point and the lowest point of the metallographic cross-section of the first end face in the first direction is smaller than the difference between the highest point and the lowest point of the metallographic cross-section of the second end face in the first direction, this can ensure the flatness of the first end face of the tab structure as much as possible, thereby facilitating the welding of the tab structure and other components to meet the welding requirements of the tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is a schematic diagram of the metallographic cross-section of the tab structure provided by the embodiment of the present utility model;

[0017] Figure 2 is a three-dimensional structural diagram of the welding tooling provided by the embodiment of the present utility model;

[0018] Figure 3 is a top view structural diagram of the welding tooling provided by the embodiment of the present utility model;

[0019] Figure 4 is a side view structural diagram of the tab structure provided by the embodiment of the present utility model;

[0020] Figure 5 is Figure 4 an enlarged view of part A in

[0021] Among them, the above-mentioned drawings include the following reference numerals:

[0022] 1. Tab structure; 11. First end face; 12. Second end face;

[0023] 20. Welding head; 21. Welding teeth;

[0024] X. First direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, in combination with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model.

[0026] As Figures 1 to 5 shown, in a first aspect, an embodiment of the present utility model provides a tab structure 1. The tab structure 1 is formed by stacking and pre-welding a plurality of tab units. The tab structure 1 includes a first end face 11 and a second end face 12 arranged opposite to each other. The first end face 11 is used to connect with a welding head 20, and the second end face 12 is used to connect with a welding table. The difference between the highest point and the lowest point of the metallographic cross-section of the first end face 11 in the first direction is H1, and the difference between the highest point and the lowest point of the metallographic cross-section of the second end face 12 in the first direction is H2, and H1 ≤ H2.

[0027] When H1 > H2, the difference between the highest point and the lowest point of the metallographic cross-section of the first end face 11 in the first direction is greater than the difference between the highest point and the lowest point of the metallographic cross-section of the second end face 12 in the first direction. In this way, the flatness of the first end face 11 cannot be guaranteed, thus unable to meet the subsequent welding of the tab structure 1 with other components. In this application, the subsequent welding includes final welding, and the final welding is to directly weld the tab structure with the terminal post.

[0028] Furthermore, the final welding is specifically laser welding. In laser welding, an appropriate material needs to be selected so that the number of electrons in the high (sub-) energy level is more than that in the low energy level, that is, population inversion is formed, so that stimulated emission can be more than absorption, thus generating laser. After the electrons are excited to the high energy level, the residence time of the electrons in the high energy level needs to be long enough to form a strong laser energy. At the same time, the operating temperature of the precision laser welding processing equipment needs to be maintained within a certain range to ensure the stability and service life of the equipment. At the same time, in order to avoid thermal deformation of the tab structure 1 and affect the welding quality, the indoor temperature also needs to be kept stable. Too high humidity will cause condensation inside the equipment, affecting the normal operation of the equipment. Therefore, the relative humidity needs to be controlled at a lower level. And during the laser welding process, impurities such as dust and smoke will affect the transmission and focusing of the light beam, thus affecting the welding quality. Therefore, the workplace should be kept clean, and dust removal and cleaning should be carried out regularly. At the same time, in order to prevent external dust from entering, the windows should be closed or dust-proof curtains should be installed. Moreover, the laser welding equipment is sensitive to vibration, so the workplace needs to have good anti-vibration measures to ensure the stability and precision of the welding process.

[0029] In addition, the air pressure control in laser welding is also very important. Air pressure is a key parameter in laser welding, which can affect multiple factors during the welding process, such as weld quality, molten pool morphology, porosity formation, welding speed, etc. The control standard of air pressure needs to be determined according to the specific welding material and thickness, and is generally controlled within the range of 0.1 - 1 MPa.

[0030] In this application, the surface flatness of the tab structure 1 is relatively good, so it is relatively friendly to the laser beam, and there will be no phenomenon that the gap between the tab units is too large, resulting in the laser reflecting and burning through the tab. In this way, the stability during final welding can be ensured.

[0031] Applying the technical solution of the present utility model, the first end face 11 of the tab structure 1 is connected to the welding head 20, and the second end face 12 of the tab structure 1 is connected to the welding table. After welding is completed, due to the high flatness of the welding table, through the analysis and comparison of the metallographic cross-section, the difference between the highest point and the lowest point of the metallographic cross-section of the first end face 11 in the first direction is smaller than the difference between the highest point and the lowest point of the metallographic cross-section of the second end face 12 in the first direction. In this way, the flatness of the first end face 11 of the tab structure 1 can be ensured as much as possible, which is beneficial to welding the tab structure 1 with other components to meet the welding requirements of the tab.

[0032] In an embodiment, H1 ≤ 0.11 mm. When H1 > 0.11 mm, the difference between the highest point and the lowest point of the metallographic cross-section of the first end face 11 in the first direction is too large, which makes the flatness of the first end face 11 poor. Thus, in the subsequent welding process, there will be no phenomenon that the gap between the tab units is too large, resulting in the laser reflecting and burning through the tab, and in this way, the stability during final welding cannot be improved. Therefore, setting 0 ≤ H1 ≤ 0.11 mm can not only make the flatness of the first end face 11 better, but also in the subsequent welding process, there will be no phenomenon that the gap between the tab units is too large, resulting in the laser reflecting and burning through the tab, and in this way, the stability during final welding can be improved. Optionally, H1 can be set to values such as 0.05 mm, 0.08 mm, or 0.11 mm, etc. The specific setting should be selected according to the usage environment of the tab structure 1, and no specific limitation is made here.

[0033] In one embodiment, 0.05 mm ≤ H2 ≤ 0.3 mm. When H2 > 0.3 mm, the difference between the highest point and the lowest point of the metallographic cross-section of the second end face 12 in the first direction is too large. After the tab structure 1 contacts the soldering station, the soldering station will damage the structure of the second end face 12 of the tab structure 1, thus affecting the flatness of the second end face 12 of the tab structure 1, and making it inconvenient for subsequent welding with other components. When H2 < 0.05 mm, the difference between the highest point and the lowest point of the metallographic cross-section of the second end face 12 in the first direction is too small, which requires a higher flatness requirement for the soldering station, thus increasing the welding cost and being not conducive to the mass production of the tab structure 1. Therefore, 0.05 mm ≤ H2 ≤ 0.3 mm, so that after the tab structure 1 contacts the soldering station, the soldering station will not damage the structure of the second end face 12 of the tab structure 1, thus preventing the flatness of the second end face 12 of the tab structure 1 from being affected, facilitating subsequent welding with other components, and not increasing the welding cost, which is conducive to the mass production of the tab structure 1. Optionally, H2 can be set to values such as 0.05 mm, 0.08 mm or 0.3 mm, etc. The specific setting should be selected according to the use environment of the valve body 10, and no specific limitation is made here.

[0034] In one embodiment, the tab structure 1 includes a plurality of tab units stacked along the first direction. One side of the tab unit at the highest position away from the tab unit at the lowest position forms the first end face 11, and one side of the tab unit at the lowest position away from the tab unit at the highest position forms the second end face 12. Such a setting can meet the requirement of stacking and connecting multiple tab units, thereby reducing the overall volume of multiple tab units to achieve the miniaturization development of the tab structure 1.

[0035] In a second aspect, an embodiment of the present invention provides a welding tooling. The welding tooling is used to stack and weld a plurality of tab units into the tab structure 1 as described above. The first end face 11 of the tab structure 1 is used to abut against the welding head 20, and the second end face 12 of the tab structure 1 is used to abut against the soldering station.

[0036] In one embodiment, the welding tooling includes: a welding head 20 having welding teeth 21 for connecting with the first end face 11 of the tab structure 1; a welding table (not shown in this application) for connecting with the second end face 12 of the tab structure 1; wherein, the welding teeth 21 are flat tooth structures, and the surface roughness of the welding teeth 21 is Sa, 10 μm ≤ Sa ≤ 85 μm. When Sa > 85 μm, the surface roughness of the welding teeth 21 is too large. When the surface roughness is too large, the effective contact area between the welding head 20 and the workpiece to be welded will decrease, resulting in an increase in the pressure at the contact point, thereby accelerating the wear of the workpiece to be welded. This is because the micro-protrusions on the rough surface are more likely to cause stress concentration during friction, leading to increased wear. When Sa < 10 μm, the surface roughness is too small, and the requirements for processing equipment and processes are higher. More precise machine tools, cutting tools and stricter processing parameters need to be adopted, which will increase the processing cost and processing time. Therefore, setting 10 μm ≤ Sa ≤ 85 μm can not only increase the effective contact area between the welding head 20 and the workpiece to be welded, reduce the pressure at the contact point, thus not accelerating the wear of the workpiece to be welded, but also not having too high requirements for processing equipment and processes, so the processing cost and processing time will not increase. Optionally, Sa can be set to values such as 10 μm, 50 μm or 85 μm, etc. The specific setting should be selected according to the use environment of the welding teeth 21, and no specific limitation is made here.

[0037] In one embodiment, the height of the welding teeth 21 in the first direction is H3, H3 ≤ 100 μm. When H3 > 100 μm, the height of the welding teeth 21 in the first direction is too large, which will increase the production cost of the welding teeth 21. Therefore, setting H3 ≤ 100 μm cannot reduce the processing cost of the welding teeth 21. Optionally, H3 can be set to values such as 50 μm, 80 μm or 100 μm, etc. The specific setting should be selected according to the use environment of the welding teeth 21, and no specific limitation is made here.

[0038] In this application, the welding teeth 21 are processed by chemical etching or electrical discharge machining.

[0039] In one embodiment, the area of the welding head 20 is S1, and the area of the welding teeth 21 is S2, where 60% ≤ S2:S1 ≤ 90%. When S2:S1 > 90%, the ratio of the area of the welding head 20 to the area of the welding teeth 21 is too large, indicating that the area of the welding teeth 21 is too large. Since the area of the welding head 20 is a fixed value and there will be a caulking part around the welding teeth 21, the area of the caulking part will be reduced, which will decrease the contact area between the caulking part and the non-welded area of the tab structure 1, thus unable to ensure the effective pressing of the caulking part on the non-welded area of the tab. When S2:S1 < 60%, the ratio of the area of the welding head 20 to the area of the welding teeth 21 is too small, indicating that the area of the welding teeth 21 is too small. Since the area of the welding head 20 is a fixed value, the area of the welding teeth 21 is reduced, which will decrease the welding efficiency. Therefore, 60% ≤ S2:S1 ≤ 90% is beneficial not only to ensure the effective pressing of the caulking part on the non-welded area of the tab structure 1 but also to ensure the area of the welding teeth 21, thus improving the welding efficiency. Optionally, S2:S1 can be set to values such as 60%, 80%, or 90%. The specific setting should be selected according to the usage environment of the ultrasonic welding head 20 and is not specifically limited here.

[0040] In one embodiment, 15 mm² ≤ S2 ≤ 600 mm 2 . When S2 > 600 mm 2 , the area of the welding teeth 21 is too large. Since the area of the welding head 20 is a fixed value and there will be a caulking part around the welding teeth 21, the area of the caulking part will be reduced, which will decrease the contact area between the caulking part and the non-welded area of the tab structure 1, thus unable to ensure the effective pressing of the caulking part on the non-welded area of the tab. When S2 < 15 mm 2 , the area of the welding teeth 21 is too small. Since the area of the welding head 20 is a fixed value, the area of the welding teeth 21 is reduced, which will decrease the welding efficiency. Therefore, 15 mm² ≤ S2 ≤ 600 mm 2 , is beneficial not only to ensure the effective pressing of the caulking part on the non-welded area of the tab structure 1 but also to ensure the area of the welding teeth 21, thus improving the welding efficiency. Optionally, S2 can be set to 15 mm 2 , 100 mm 2 or 600 mm 2 and other values. The specific setting should be selected according to the usage environment of the first caulking sub-part 31 and is not specifically limited here.

[0041] In one embodiment, 24 mm² ≤ S1 ≤ 780 mm 2 . When S1 > 780 mm 2When S1 is less than 24 mm, the area of ​​the welding head 20 is too large, so it is not convenient to accurately align the welding head 20 with the workpiece to be welded, thereby reducing the welding efficiency and increasing the production cost of the welding head 20, which is not conducive to the mass production of the welding head 20. 2 When the welding head 20 is too small, it cannot meet the welding requirements of larger parts to be welded. Therefore, 24mm2≤S1≤780mm 2 , which not only facilitates the precise alignment of the welding head 20 and the workpiece to be welded, thereby improving the welding efficiency, but also does not increase the production cost of the welding head 20, thereby facilitating the mass production of the welding head 20 and also meeting the welding requirements of larger workpieces to be welded. Optionally, S1 can be set to 24mm 2 , 200mm 2 or 780mm 2 The specific setting should be selected according to the use environment of the welding head 20, and no specific limitation is made here.

[0042] By applying the technical solution of the utility model, the first end face 11 of the pole lug structure 1 is connected to the welding head 20, and the second end face 12 of the pole lug structure 1 is connected to the welding platform. After the welding is completed, after analysis and comparison of the metallographic cross-section, due to the high flatness of the welding platform, the difference between the highest point and the lowest point of the metallographic cross-section of the first end face 11 in the first direction is smaller than the difference between the highest point and the lowest point of the metallographic cross-section of the second end face 12 in the first direction. In this way, the flatness of the first end face 11 of the pole lug structure 1 can be guaranteed as much as possible, which is conducive to welding the pole lug structure 1 with other components to meet the welding requirements of the pole lug.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0045] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0046] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationships of a device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0047] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0048] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tab structure, comprising a plurality of tab units stacked and pre-welded together, characterized in that: The tab structure includes a first end face and a second end face arranged opposite to each other, the difference between the highest point and the lowest point of the metallographic cross-section of the first end face in the first direction is H1, and the difference between the highest point and the lowest point of the metallographic cross-section of the second end face in the first direction is H2, H1≤H2.

2. The tab structure according to claim 1, characterized in that: H1≤0.11mm.

3. The tab structure according to claim 1, characterized in that: 0.05mm≤H2≤0.3mm.

4. A welding tool, characterized in that: The welding tool is used to stack and weld a plurality of tab units into a tab structure as described in any one of claims 1 to 3, wherein the first end surface of the tab structure is used to abut against a welding head, and the second end surface of the tab structure is used to abut against a welding platform.

5. The welding tool according to claim 4, characterized in that: The welding tool comprises: A welding head having welding teeth, wherein the welding teeth are used to connect with the first end surface of the pole lug structure; A welding platform, connected to the second end surface of the tab structure; Wherein, the welding teeth are flat tooth structures.

6. The welding tool according to claim 5, characterized in that: The surface roughness of the welding tooth is Sa, 10μm≤Sa≤85μm.

7. The welding tool according to claim 6, characterized in that: A height of the welding tooth in the first direction is H3, and H3≤100 μm.

8. The welding tool according to claim 6, characterized in that: The area of ​​the welding head is S1, the area of ​​the welding teeth is S2, and 60%≤S2:S1≤90%.

9. The welding tool according to claim 6, characterized in that: 15mm≤S2≤600mm2.

10. The welding tool according to claim 6, characterized in that: 24mm≤S1≤780mm 2 。

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