Welding seat structure and ultrasonic welding device with same

Abstract

The utility model provides a welding seat structure and an ultrasonic welding device with the same. The welding seat structure disclosed by the utility model is used for ultrasonic welding of a tab, and comprises a base and supporting teeth, the base can be assembled on an ultrasonic welding device; the supporting teeth are arranged on the base at intervals, and each supporting tooth comprises a supporting part arranged on the base and an abutting part arranged on the supporting part; the abutting part is arranged in a spherical shape, and when the tab abuts against the abutting part, the spherical surface of the abutting part abuts against the tab. According to the welding seat structure, the spherical abutting part is arranged, so that the contact surface of the abutting part and the tab is a smooth spherical surface, abrasion caused by contact of the supporting teeth and the tab can be reduced, and the supporting teeth are not easy to adhere to the tab during ultrasonic welding due to the spherical abutting part, so that the welding seat structure is simple in structure and convenient to use. The effect of improving the quality of ultrasonic welding products is achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery processing technology, and in particular to a welding base structure. This utility model also relates to an ultrasonic welding device equipped with the above-mentioned welding base structure. Background Technology

[0002] In the emerging automotive power battery industry, ultrasonic welding has become an indispensable part of the battery manufacturing process. Ultrasonic metal welding technology utilizes the mechanical vibration energy generated by ultrasound. Under pressure, the welding head transmits energy to the interface between the workpieces through high-frequency vibration, causing high-frequency friction between the workpiece interfaces. This is converted into frictional work, deformation energy, and temperature rise between the workpiece interfaces, thereby destroying the oxide layer on the workpiece surface and causing plastic deformation of the interface between the workpieces. This results in pure metal bonding and atomic diffusion, ultimately achieving solid-phase connection of the metal workpieces. Ultrasonic welding is commonly used for welding the tabs of the battery's internal electrode assembly and for welding the tabs to the connecting pieces.

[0003] In related technologies, ultrasonic welding devices used in ultrasonic welding have a welding base, which includes multiple support teeth fixed to a base. These support teeth are arranged on the base. During welding, the workpiece to be welded is placed on the welding base, and ultrasonic welding is completed with the assistance of a welding head. Currently, the support teeth on welding bases are mostly sharp-toothed, which can easily scratch the electrode plates and cause them to stick together during ultrasonic welding, thus hindering the improvement of the quality of the ultrasonic welding device and the welded products. Utility Model Content

[0004] In view of this, the present invention aims to propose a welding base structure to improve the quality of ultrasonic welding products.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A welding base structure for ultrasonic welding tabs, comprising:

[0007] A base that can be mounted on an ultrasonic welding device;

[0008] Support teeth are spaced apart on the base, and each support tooth includes a support portion on the base and an abutment portion on the support portion.

[0009] The abutting part is spherical, and when the electrode tab presses against the abutting part, the spherical surface of the abutting part abuts against the electrode tab.

[0010] Furthermore, adjacent support teeth are evenly arranged on the base at a distance a.

[0011] Furthermore, the spacing a ranges from 1mm to 1.4mm.

[0012] Furthermore, the support portion is shaped like a frustum, and the larger diameter end of the support portion is located on the base. The diameter b of the larger diameter end of the support portion ranges from 0.7mm to 0.9mm.

[0013] Furthermore, the angle α between the side peripheral surface of the support and the bottom surface of the support is in the range of 50°-70°.

[0014] Furthermore, the diameter φ of the abutment portion ranges from 0.3mm to 0.5mm.

[0015] Furthermore, the height h of the support tooth ranges from 0.8 mm to 1 mm.

[0016] Furthermore, the base includes a top plate and a bottom plate disposed below the top plate; the top plate is arranged in the shape of a truncated pyramid, and the lower surface of the top plate is disposed on the bottom plate, and each of the supporting teeth is arranged at intervals on the upper surface of the top plate.

[0017] Furthermore, a recessed groove is provided between the top plate and the bottom plate, and the recessed groove is arranged along the circumference of the base.

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] The welding base structure described in this utility model, by setting a spherical abutment part, makes the contact surface between the abutment part and the electrode tab a smooth spherical surface, which can reduce the wear caused by the contact between the support teeth and the electrode tab; and by setting the spherical abutment part, the support teeth are less likely to stick to the electrode tab during ultrasonic welding, and compared with toothed support teeth, the above-mentioned setting is less likely to stick to the electrode tab and cause electrode tab tearing, which helps to improve the quality of ultrasonic welding products.

[0020] Meanwhile, by setting the support teeth at equal intervals on the base, the ultrasonic welding points are evenly distributed across the welding area of ​​the electrode tabs. Since ultrasonic welding utilizes high-frequency vibration to generate heat, the evenly distributed support teeth on the base further help to evenly distribute the heat generated by the high-frequency vibration, making the welding points stronger and less prone to phenomena such as incomplete welds or false welds. Moreover, compared to a tightly arranged support tooth without spacing, the evenly spaced support teeth can also prevent the weld points from burning or melting through due to excessive weld point density.

[0021] Secondly, by designing the support portion in a frustoconical shape, the pressure of the support portion is concentrated on the abutment portion, which helps to ensure welding strength. The combination of the spherical abutment portion and the frustoconical support portion not only helps to improve the welding strength of the electrode tab, but also prevents the support teeth from sticking to the electrode tab and causing tearing. Compared with the existing sharp-toothed support teeth, it can not only meet the welding requirements of ultra-thick electrode tabs and avoid the incomplete weld caused by insufficient welding strength, but also solve the problem of electrode tab tearing caused by adhesion between the electrode tab and the base.

[0022] Secondly, the top-narrow, bottom-wide support section helps concentrate pressure on the abutment part, amplifying the welding pressure and providing greater welding pressure to improve welding strength, which is beneficial for welding ultra-thick tabs. During welding, the abutment part is inserted into the tab by the pressure provided by the support section. During ultrasonic vibration, the spherical abutment part has less friction with the tab and does not stick to the tab during the back-and-forth vibration. After welding, the abutment part withdraws from the tab, and the friction during withdrawal is less than that of the pointed tooth support teeth, making it less likely to stick to the tab compared to the pointed tooth support teeth.

[0023] In addition, the top plate, which is shaped like a truncated quadrangular pyramid, has a cross-sectional area that gradually decreases from bottom to top. Furthermore, by setting a sink groove, the top surface area of ​​the base is smaller than its own bottom surface area, thereby increasing the welding pressure transmitted between the bottom plate and the top plate, which is beneficial for welding multi-layer tabs.

[0024] Another objective of this invention is to provide an ultrasonic welding device, which has a welding seat structure as described above.

[0025] The ultrasonic welding device described in this utility model, by assembling the welding base structure as described above, helps to reduce wear caused by contact between the welding base structure and the electrode tab; and during ultrasonic welding, it makes the welding base structure less likely to stick to the electrode tab, thus helping to improve the quality of ultrasonic welded products. Attached Figure Description

[0026] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of the support tooth described in an embodiment of the present utility model;

[0028] Figure 2 This is a front view of the welding base structure described in an embodiment of the present utility model;

[0029] Figure 3 This is a side view of the welding base structure described in an embodiment of the present utility model;

[0030] Figure 4 This is a top view of the welding base structure described in an embodiment of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Base; 101. Top plate; 102. Bottom plate; 103. Sinking groove;

[0033] 2. Support tooth; 201. Support part; 202. Abutment part;

[0034] 3. Polar ears;

[0035] a. Spacing; b. Diameter of the large circle end of the support; α. Angle; φ. Diameter of the contact part; h. Height. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] Taking the welding base structure described in this utility model as an example, the directional terms used in the embodiments, such as "up," "down," "left," "right," "front," and "back," are defined based on the vertical direction (also known as the height direction), horizontal direction (also known as the width direction), and front-back direction (also known as the length direction) of the welding base structure. "Inner" and "outer" are defined based on the outline of the corresponding component. For example, "inner" and "outer" are defined based on the outline of the welding base structure. The side of the welding base structure outline closer to the middle of the welding base structure is "inner," and the opposite side is "outer."

[0039] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] This embodiment relates to a welding base structure to improve the quality of ultrasonic welding products.

[0043] In terms of overall structure, such as Figures 1 to 4 As shown, the welding base structure is used for ultrasonic welding of electrode tabs 3. The welding base structure includes a base 1 and support teeth 2. The base 1 can be mounted on an ultrasonic welding device. The support teeth 2 are arranged at intervals on the base 1, and each support tooth 2 includes a support portion 201 provided on the base 1 and an abutment portion 202 provided on the support portion 201. The abutment portion 202 is spherically arranged, and when the electrode tab 3 presses against the abutment portion 202, the spherical surface of the abutment portion 202 abuts against the electrode tab 3.

[0044] As described above, by setting a spherical abutment part 202, the contact surface between the abutment part 202 and the electrode tab 3 is a smooth spherical surface, which can reduce the wear caused by the contact between the support tooth 2 and the electrode tab 3; and by setting a spherical abutment part 202, the support tooth 2 is less likely to stick to the electrode tab 3 during ultrasonic welding. Compared with the sharp tooth-shaped support tooth 2, the above-mentioned setting is less likely to stick to the electrode tab 3 and cause the electrode tab 3 to tear, which helps to improve the quality of ultrasonic welding products.

[0045] Specifically, in this embodiment, as an exemplary structure, the spherical abutment portion 202 is a complete sphere. As other optional feasible structures, the abutment portion 202 may also be hemispherical, or the sphere may be cut to form a quasi-spherical structure with a plane, and the diameter of the plane is smaller than the diameter of the sphere. Based on this, the abutment portion 202 is connected to the support portion 201 through the plane.

[0046] As an optional implementation of the support 201, such as Figures 1 to 4 As shown, the support portion 201 is shaped like a frustum, with its larger diameter end resting on the base 1, and the abutment portion 202 resting on its smaller diameter end. When the abutment portion 202 is a solid sphere, after fixing it to the support portion 201, the axial extension line of the support portion 201 passes through the center of the abutment portion 202. When the abutment portion 202 is a hemisphere or near-hemisphere with a flat surface, the flat surface of the abutment portion 202 is fixedly connected to the smaller diameter end of the frustum-shaped support portion 201, and the diameter of the smaller diameter end is not greater than the diameter of the flat surface. More preferably, the flat surface is the same size as the end face of the smaller diameter end of the support portion 201.

[0047] By setting the support part 201 to a frustum shape, the pressure of the support part 201 is concentrated on the abutment part 202, which helps to ensure the welding strength.

[0048] Currently, to improve the energy density of lithium batteries, the thickness of the electrode assembly and the number of stacked or wound layers are continuously increased. By increasing the number of negative and positive electrode layers, the capacity and energy density of a single cell are improved. This leads to an increase in the number of tab 3 layers and the thickness of tab 3. The above-mentioned spherical abutment part 202 and frustoconical support part 201, in combination, not only help improve the welding strength of tab 3, but also prevent the support teeth 2 from sticking to tab 3 and causing tearing. Compared with the existing sharp-toothed support teeth 2, it can not only meet the welding requirements of ultra-thick tab 3 and avoid the problem of insufficient welding strength causing poor welding, but also solve the problem of tab 3 tearing caused by sticking to base 1.

[0049] To improve the strength of ultrasonic welding, such as Figure 1 and Figure 4 As shown, adjacent support teeth 2 are evenly arranged on the base 1 at a spacing of a. By setting the support teeth 2 at equal intervals a on the base 1, the ultrasonic welding points are evenly distributed on the welding area of ​​the electrode tab 3. Since ultrasonic welding uses high-frequency vibration to generate heat for welding, the equal intervals a of the support teeth 2 on the base 1 also help to evenly distribute the heat generated by the high-frequency vibration, making the welding points stronger and less prone to phenomena such as incomplete welding or false welding. Moreover, compared with the close arrangement of support teeth 2 without spacing a, the support teeth 2 with equal intervals a can also avoid the situation where the welding points are charred or melted through due to excessive welding point density.

[0050] Based on this, as an example distance of spacing a, the range of spacing a is 1mm-1.4mm. For example, spacing a can be 1mm, 1.1mm, 1.2mm and 1.35mm, etc. Preferably, spacing a is 1.2mm, so that the electrode tab 3 is welded firmly and helps to avoid melting and penetration caused by overheating.

[0051] To enable this welding base structure to be suitable for ultra-thick electrode tabs 3 formed by stacking multiple layers of electrode tabs 3, as an implementable method for the support tooth 2, the specific range of the height h of the support tooth 2 is set to 0.8mm-1mm. For example, the height h of the support tooth 2 can be 0.8mm, 0.85mm, 0.9mm, and 1mm, etc., with a preferred height h of 0.9mm. This setting allows the support tooth 2 to weld the multilayer electrode tabs 3.

[0052] Based on this, and based on the spherical abutment portion 202 and the frustum-shaped support portion 201 as described above, in specific implementations, the diameter φ of the abutment portion 202 is set to be in the range of 0.3mm-0.5mm. For example, the diameter φ of the abutment portion 202 can be 0.35mm, 0.4mm, 0.45mm, etc., and preferably the diameter φ of the abutment portion 202 is 0.4mm.

[0053] As the support part 201 that supports the abutment part 202, the diameter b of the large diameter end of the support part 201 is set to be in the range of 0.7mm-0.9mm, that is, the diameter of the end face of the support part 201 connected to the base 1 is 0.7mm-0.9mm, and for example, the diameter b of the large diameter end of the support part 201 can be 0.7mm, 0.75mm, 0.8mm and 0.85mm, etc. Preferably, the diameter b of the large diameter end of the support part is 0.8mm.

[0054] Based on the set total height h of the support tooth 2, the diameter φ of the abutment portion 202, and the diameter b of the large-diameter end of the support portion 201, to improve the structural strength of the support tooth 2 and increase the welding pressure of the support tooth 2 on the electrode tab 3, the angle α between the side circumferential surface and the bottom surface of the support portion 201 is set to be in the range of 50°-70°. For example, the angle α between the side circumferential surface and the bottom surface of the support portion 201 can be 50°, 55°, 60°, or 65°, etc., and preferably the angle α between the side circumferential surface and the bottom surface of the support portion 201 is 60°. With this setting, the support portion 201, which is narrower at the top and wider at the bottom, helps to concentrate the pressure on the abutment portion 202, which can amplify the welding pressure, help to provide greater welding pressure to improve welding strength, and is beneficial for welding ultra-thick electrode tabs 3.

[0055] When configured as described above, during welding, the abutment part 202 is inserted into the tab 3 by the pressure provided by the support part 201. During ultrasonic vibration, the spherical abutment part 202 has less friction with the tab 3 and does not stick to the tab 3 during the back-and-forth vibration. After welding, the abutment part 202 exits from the tab 3. During the exit process, the friction is less than that of the toothed support tooth 2, and therefore it is less likely to stick to the tab 3 than the toothed support tooth 2.

[0056] To increase the pressure in ultrasonic welding, such as Figures 2 to 4 As shown, the base 1 includes a top plate 101 and a bottom plate 102 located below the top plate 101. The top plate 101 is shaped like a frustum, and its lower surface rests on the bottom plate 102. The support teeth 2 are spaced apart on the upper surface of the top plate 101. Specifically, the area of ​​the upper surface of the frustum-shaped top plate 101 is smaller than that of the lower surface of the top plate 101. Depending on the required welding area, the top plate 101 can be a long strip-shaped frustum.

[0057] Based on this, as a preferred embodiment, the base plate 102 has a rectangular plate structure, and the top plate 101 is fixed to the upper surface of the base plate 102. A recess 103 is provided between the top plate 101 and the base plate 102, and the recess 103 is arranged along the circumference of the base 1. That is, the recess 103 is formed on the circumferential sidewall of the base plate 102 near the top plate 101, so that the contact area between the base plate 102 and the top plate 101 is smaller than the cross-sectional area of ​​the base plate 102.

[0058] The top plate 101, which is arranged in the shape of a quadrangular frustum, gradually decreases in cross-sectional area from bottom to top. Based on the setting of the sink 103, the top surface area of ​​the base 1 is smaller than its own bottom surface area, thereby increasing the welding pressure under the transmission of the bottom plate 102 and the top plate 101, which is beneficial for welding the multi-layer tabs 3.

[0059] The welding base structure described in this embodiment, by providing a spherical abutment portion 202, ensures that the contact surface between the abutment portion 202 and the electrode tab 3 is a smooth spherical surface, which reduces wear caused by the contact between the support teeth 2 and the electrode tab 3. Furthermore, by providing a spherical abutment portion 202, the support teeth 2 are less likely to stick to the electrode tab 3 during ultrasonic welding. Compared to toothed support teeth 2, this design is less likely to cause the electrode tab 3 to tear due to adhesion, thus improving the quality of ultrasonically welded products. Compared to existing sharp-toothed support teeth 2, this design not only meets the welding requirements of ultra-thick electrode tabs 3, avoiding insufficient welding strength and resulting in incomplete welds, but also solves the problem of the electrode tab 3 tearing due to adhesion between it and the base 1.

[0060] Example 2

[0061] This embodiment relates to an ultrasonic welding apparatus, which has a welding seat structure as described above.

[0062] Specifically, during implementation, when connecting the welding base structure to the ultrasonic welding device, the welding base structure is securely connected to the body of the ultrasonic welding device via the base plate 102. The connection method can be either welding the base plate 102 to the body of the ultrasonic welding device or using bolts for fixing. This ultimately achieves a stable connection between the welding base structure and the body of the ultrasonic welding device, preventing relative vibration between them.

[0063] The ultrasonic welding apparatus of this embodiment, by assembling the welding base structure as described above, helps to reduce wear caused by contact between the welding base structure and the electrode 3; and during ultrasonic welding, it makes the welding base structure less likely to stick to the electrode 3, which helps to improve the quality of ultrasonic welded products.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A weld pad structure for ultrasonic welding of tabs, characterized by, The application relates to an ultrasonic welding device, which comprises a base capable of being assembled on the ultrasonic welding device; support teeth arranged on the base at intervals, each of the support teeth comprising a support part arranged on the base and an abutting part arranged on the support part; the abutting part is arranged in a spherical shape, and when the tab is pressed against the abutting part, the spherical surface of the abutting part abuts against the tab.

2. The welding seat structure according to claim 1, wherein: adjacent two support teeth are arranged on the base at an interval a.

3. The welding seat structure according to claim 2, wherein: the interval a is 1mm-1.4mm.

4. The welding seat structure according to claim 1, wherein: the support part is arranged in a frustum shape, and a large-diameter end of the support part is arranged on the base, and the diameter b of the large-diameter end is 0.7mm-0.9mm.

5. The welding seat structure according to claim 4, wherein: the angle alpha between the side surface of the support part and the bottom surface of the support part is 50-70 degrees.

6. The welding seat structure according to claim 1, wherein: the diameter phi of the abutting part is 0.3mm-0.5mm.

7. The welding seat structure according to claim 1, wherein: the height h of the support tooth is 0.8mm-1mm.

8. The welding seat structure according to any one of claims 1-7, wherein: the base comprises a top plate and a bottom plate arranged below the top plate; the top plate is arranged in a quadrangular frustum shape, and the lower surface of the top plate is arranged on the bottom plate, and each of the support teeth is arranged on the upper surface of the top plate at intervals.

9. The welding seat structure according to claim 8, wherein: a sink is arranged between the top plate and the bottom plate, and the sink is arranged along the circumference of the base.

10. An ultrasonic welding device, comprising: the welding seat structure according to any one of claims 1-9. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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