Welding assembly and ultrasonic welding device

Abstract

The utility model relates to the technical field of welding, and provides a welding assembly and an ultrasonic welding device.The welding assembly comprises a welding head and a welding base, the welding head is provided with a first welding face, the first welding face comprises a main welding area and an auxiliary welding area, the auxiliary welding area is located on the peripheral side of the main welding area, the main welding area is provided with main welding teeth, and the auxiliary welding area is provided with auxiliary welding teeth; the tooth depth of the main welding teeth is larger than that of the auxiliary welding teeth. The welding base is used for bearing a to-be-welded tab, and a second welding face matched with the first welding face is formed at the end, facing the welding head, of the welding base. According to the welding assembly and the ultrasonic welding device, the cracking probability of the tabs can be reduced.

Description

Technical Field

[0001] This application relates to the field of welding technology, and more particularly to a welding assembly and an ultrasonic welding apparatus. Background Technology

[0002] Ultrasonic welding is commonly used to weld multi-layer tabs in batteries. The principle involves placing the multi-layer tabs between a welding socket and a welding head, then using the high-frequency vibrations generated by the welding teeth on the welding head during the welding process to melt and weld the parts to be welded. However, in related technologies, the welding head's downward pressure on the tabs during welding can easily cause cracking. Utility Model Content

[0003] In view of this, embodiments of this application aim to provide a welding assembly and an ultrasonic welding apparatus that can reduce the probability of electrode tab cracking.

[0004] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0005] This application discloses a welding assembly in an ultrasonic welding apparatus, the welding assembly comprising:

[0006] The welding head has a first welding surface, which includes a main welding area and an auxiliary welding area. The auxiliary welding area is located around the main welding area. The main welding area is provided with main welding teeth, and the auxiliary welding area is provided with auxiliary welding teeth. The tooth depth of the main welding teeth is greater than the tooth depth of the auxiliary welding teeth.

[0007] A welding base is used to support the electrode tab to be welded, and a second welding surface is formed at one end of the welding base facing the welding head, which mates with the first welding surface.

[0008] In one embodiment, the width direction of the electrode tab to be welded is a first direction, and the auxiliary welding area and the main welding area are arranged along the first direction.

[0009] In one embodiment, there are two auxiliary soldering areas, which are disposed on both sides of the main soldering area along the first direction.

[0010] In one embodiment, there are multiple main welding teeth and multiple auxiliary welding teeth. The multiple main welding teeth are arranged at intervals along the first direction to form a main welding tooth group. The multiple welding tooth groups are arranged at intervals along the second direction to form a main welding tooth portion. The multiple auxiliary welding teeth on each auxiliary welding area are arranged at intervals along the second direction to form an auxiliary welding tooth group. The first direction and the second direction intersect.

[0011] In one embodiment, the dimension of the main soldering area along the first direction is between 15 mm and 22 mm, and the dimension of the main soldering area along the second direction is between 5 mm and 7 mm;

[0012] The dimensions of each of the auxiliary soldering areas along the first direction are between 3 mm and 5 mm, and the dimensions of each of the auxiliary soldering areas along the second direction are between 5 mm and 7 mm, wherein the first direction and the second direction intersect.

[0013] In one embodiment, the main welding tooth is frustum-shaped, having a first circular surface and a second circular surface. The first circular surface is located on the side of the main welding tooth closest to the welding seat, and the second circular surface is located on the other side of the main welding tooth opposite to the first circular surface. The diameter of the first circular surface is between 0.2 mm and 0.5 mm, and the diameter of the second circular surface is between 0.6 mm and 0.9 mm; and / or,

[0014] The main welding tooth has a first spherical structure on the side near the welding seat. The first spherical structure is a structure that is less than or equal to 1 / 2 of a sphere.

[0015] In one embodiment, the auxiliary welding tooth is frustum-shaped, and the main welding tooth has a third circular surface and a fourth circular surface. The third circular surface is located on the side of the auxiliary welding tooth near the welding seat, and the fourth circular surface is located on the other side of the auxiliary welding tooth opposite to the third circular surface. The diameter of the third circular surface is between 0.08 mm and 0.15 mm, and the diameter of the fourth circular surface is between 0.2 mm and 0.3 mm; and / or,

[0016] The auxiliary welding tooth has a second spherical structure on the side near the welding seat. The second spherical structure is a structure that is less than or equal to 1 / 2 of a sphere.

[0017] In one embodiment, the electrode tab to be welded is provided with double solder marks, and the spacing between two adjacent solder marks is between 5 mm and 10 mm.

[0018] In one embodiment, the tooth depth of the main welding tooth is between 1 mm and 1.25 mm; and / or,

[0019] The depth of the auxiliary welding teeth is between 0.3 mm and 0.5 mm.

[0020] In one embodiment, the second welding surface is provided with a plurality of protrusions protruding toward the electrode tab to be welded, the height of the protrusions being between 0.2 mm and 0.3 mm.

[0021] In one embodiment, the welding head is made of high-speed steel.

[0022] In one embodiment, the thickness of each tab layer in the tab to be welded is between 8 μm and 15 μm, and the number of tab layers in the tab to be welded is between 100 and 120.

[0023] Another aspect of this application discloses an ultrasonic welding apparatus, including the welding components in any of the above embodiments.

[0024] This application discloses a welding assembly and an ultrasonic welding device. During the welding process, since the tooth depth of the auxiliary welding teeth on the periphery is smaller than that of the main welding teeth, the auxiliary welding teeth can buffer the tearing force generated by the main welding teeth during welding of the electrode tab to be welded, thereby reducing the pulling of the main welding teeth on the electrode tab to be welded. In this way, not only can the cracking of the electrode tab to be welded be reduced, the DC resistance can be reduced, the overcurrent capacity can be improved, the electrical performance can be ensured and the risk of power failure can be reduced, but the yield can also be improved. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the welding head provided in the embodiments of this application;

[0026] Figure 2 This is a schematic diagram of the structure of a welding socket provided in another embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the main welding tooth and the first spherical structure provided in another embodiment of this application.

[0028] Explanation of reference numerals in the attached figures

[0029] 1. Welding head; 1a. Main welding tooth; 1a1. Main welding tooth group; 1a2. First circular surface; 1a3. Second circular surface; 1b. Auxiliary welding tooth; 1b1. Auxiliary welding tooth part; 1c. First spherical structure; 2. Welding seat; 2a. Second welding surface; 2b. Protrusion. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0031] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "first," "second," etc., used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] As the public's reliance on new energy vehicles gradually increases, their use has shifted from urban driving to long-distance travel. This has placed higher demands on long driving range and fast charging performance. For example, more and more car manufacturers have explicitly proposed a 5C12min charging requirement to meet the public's fast charging needs for new energy vehicles. However, this places higher demands on battery cell design and manufacturing processes.

[0033] The main challenge lies in meeting the requirements of fast charging. Most car manufacturers often use a stacking method to form groups of electrodes. To effectively reduce the DC resistance of the cells, the coating of the electrode is becoming thinner and thinner, which allows the number of electrode layers to increase to more than 100 layers. However, as the number of electrode layers increases, welding heads with shorter tooth depth are prone to poor welding during ultrasonic welding, which leads to increased DC resistance of the battery, reduced overcurrent capacity, and affects battery performance. On the other hand, using welding heads with longer tooth depth during ultrasonic welding will result in greater tearing force at the edge of the electrode, which can easily cause the electrode to crack.

[0034] One embodiment of this application provides a welding assembly applied to an ultrasonic welding device. Please refer to [link to relevant documentation]. Figures 1 to 3 The welding assembly includes a welding head 1 and a welding base 2. The welding head 1 has a first welding surface, which includes a main welding area and an auxiliary welding area. The auxiliary welding area is located around the main welding area. The main welding area is provided with main welding teeth 1a, and the auxiliary welding area is provided with auxiliary welding teeth 1b. The tooth depth of the main welding teeth 1a is greater than the tooth depth of the auxiliary welding teeth 1b. The welding base 2 is used to support the electrode tab to be welded. The end of the welding base 2 facing the welding head 1 has a second welding surface 2a that mates with the first welding surface.

[0035] It should be noted that when ultrasonic welding is used on the electrode tab to be welded, the welding teeth of welding head 1 will transfer the stress on the electrode tab to the edge to generate a certain tear on the edge of the electrode tab to be welded. If the tooth depth of the welding teeth located at the edge is the same as the tooth depth of other welding teeth, the tearing force on the edge will be increased, eventually leading to cracking.

[0036] The welding assembly provided in this application divides the first welding surface of the welding head 1 into two areas: a main welding area and an auxiliary welding area. The main welding area is provided with main welding teeth 1a, and the auxiliary welding area is provided with auxiliary welding teeth 1b. The auxiliary welding area is located on the periphery of the main welding area, such that the auxiliary welding teeth 1b are located on the periphery of the main welding teeth 1a. The welding base 2 forms a second welding surface 2a for supporting the electrode tab to be welded. Here, when welding the electrode tab to be welded, the electrode tab to be welded can be placed on the second welding surface 2a of the welding base 2 firstly, and then the side of the welding head 1 with the first welding surface is pressed against the electrode tab to be welded. In this way, during the welding process, since the tooth depth of the auxiliary welding teeth 1b on the periphery is smaller than the tooth depth of the main welding teeth 1a, the auxiliary welding teeth 1b can buffer the tearing force generated by the main welding teeth 1a during welding of the electrode tab to be welded, reducing the pulling of the main welding teeth 1a on the electrode tab to be welded. In this way, not only can the cracking of the electrode tab to be welded be reduced, the DC resistance can be lowered, the overcurrent capacity can be improved, the electrical performance can be ensured, and the risk of power failure can be reduced, but the yield can also be improved.

[0037] For example, the first direction can be the width direction of the electrode tab to be welded, the second direction can be the length direction of the electrode tab to be welded, and the third direction can be the thickness direction of the electrode tab to be welded.

[0038] For example, please refer to Figure 1 and Figure 3 , Figure 1 R1 in the equation can be the first direction. Figure 1 R2 in the equation can be the second direction. Figure 3 R3 in the equation can be a third party.

[0039] For example, in one embodiment, the location of the auxiliary soldering area and the main soldering area is not limited. For example, the auxiliary soldering area and the main soldering area can be arranged along a first direction and / or a second direction.

[0040] Specifically, the width direction of the electrode tab to be welded is the first direction, and the auxiliary welding area and the main welding area are arranged along the first direction.

[0041] It should be noted that when ultrasonic welding is performed on the electrode tabs to be welded, most of the stress generated by the welding teeth will be transmitted along the width direction of the electrode tab, which can easily lead to edge cracking along the width direction.

[0042] Here, by arranging the main welding area and the auxiliary welding area along the width direction of the electrode tab to be welded, i.e., the first direction, the auxiliary welding tooth 1b with a smaller tooth depth can release the stress caused by the main welding tooth 1a on one side of its width direction to provide a buffering effect. In this way, the probability of cracking on both sides of the electrode tab to be welded along its thickness direction can be reduced, the yield rate and production efficiency can be improved, and the manufacturing cost can be reduced.

[0043] In one embodiment, there are two auxiliary soldering areas, which are located on both sides of the main soldering area along the first direction.

[0044] In other words, the main welding area is located in the middle of the two auxiliary welding areas along the first direction, that is, there are auxiliary welding teeth 1b on both sides of the main welding tooth 1a along the first direction. In this way, the auxiliary welding teeth 1b on the two auxiliary welding areas can release the stress caused by the main welding tooth 1a on both sides of its first direction, further reducing the probability of cracking of the electrode tab to be welded.

[0045] In one embodiment, please refer to Figure 1 There are multiple main welding teeth 1a and multiple auxiliary welding teeth 1b. Multiple main welding teeth 1a are arranged at intervals along a first direction to form a main welding tooth group 1a1. Multiple welding tooth groups are arranged at intervals along a second direction to form a main welding tooth section. Multiple auxiliary welding teeth 1b on each auxiliary welding area are arranged at intervals along a second direction to form an auxiliary welding tooth group 1b. The first direction and the second direction intersect.

[0046] For example, every 10 main welding teeth 1a can be arranged at intervals along a first direction to form a main welding tooth group 1a1, and then 3 main welding tooth groups 1a1 can be arranged at intervals along a second direction to form a main welding tooth portion, and 4 auxiliary welding teeth 1b on the two auxiliary welding areas along the first direction can be arranged at intervals along the second direction to form an auxiliary welding tooth group 1b.

[0047] In this way, the main welding teeth located in the main welding area can weld the electrode lugs to be welded using their longer welding teeth, reducing the occurrence of incomplete welds. Meanwhile, the auxiliary welding teeth 1b group located on both sides of the main welding area along the first direction can release the transmitted stress to a certain extent using shorter welding teeth, buffer the tearing force, and reduce the occurrence of cracks.

[0048] In one embodiment, the dimension of the first welding surface along the first direction is between 21 mm and 32 mm, and the dimension of the first welding surface along the second direction is between 5 mm and 7 mm.

[0049] For example, the dimension of the first welding surface along the first direction can be 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm or 32mm, etc., and the dimension of the first welding surface along the second direction can be 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm or 7mm.

[0050] In one embodiment, the size of the main soldering area along the first direction is between 15 mm and 22 mm, and the size of the main soldering area along the second direction is between 5 mm and 7 mm.

[0051] For example, the dimensions of the main solder area along the first direction can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm or 22mm, etc.; the dimensions of the main solder area along the second direction can be 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm or 7mm.

[0052] Here, by setting appropriate dimensions along the first direction and along the second direction, the proportion of the main welding area on the first welding surface can be increased, thereby increasing the number of main welding teeth 1a, which can reduce the probability of incomplete welding and improve the welding quality.

[0053] In one embodiment, the dimension of each auxiliary soldering area along the first direction is between 3 mm and 5 mm, and the dimension of each auxiliary soldering area along the second direction is between 5 mm and 7 mm, wherein the first direction and the second direction intersect.

[0054] For example, the dimensions of each auxiliary soldering area along the first direction can be 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, or 5mm, etc.; the dimensions of each auxiliary soldering area along the second direction can be 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, or 7mm, etc.

[0055] Here, by setting appropriate dimensions along the first and second directions, it is possible to reduce the tearing force while also reducing the area occupied by the auxiliary soldering area, thereby increasing the proportion of the main soldering area and reducing the probability of cold solder joints.

[0056] In one embodiment, please refer to Figure 3 The main welding tooth 1a is truncated cone in shape. The main welding tooth 1a has a first circular surface 1a2 and a second circular surface 1a3. The first circular surface 1a2 is located on the side of the main welding tooth 1a close to the welding seat 2, and the second circular surface 1a3 is located on the other side of the main welding tooth 1a opposite to the first circular surface 1a2. The diameter L2 of the first circular surface 1a2 is between 0.2 mm and 0.5 mm, and the diameter L3 of the second circular surface 1a3 is between 0.6 mm and 0.9 mm.

[0057] For example, the diameter L2 of the first circular surface 1a2 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, or 0.5mm, etc.; the diameter L3 of the second circular surface 1a3 can be 0.6mm, 0.62mm, 0.64mm, 0.66mm, 0.68mm, 0.7mm, 0.72mm, 0.74mm, 0.76mm, 0.78mm, 0.8mm, 0.82mm, 0.84mm, 0.86mm, 0.88mm, or 0.9mm, etc.

[0058] Here, by setting a frustum-shaped main welding tooth 1a of appropriate size, on the one hand, the second circular surface 1a3, due to its planar structure and larger diameter, can increase the connection area between the main welding tooth 1a and the welding head 1, thereby improving the connection stability of the main welding tooth 1a; on the other hand, the first circular surface 1a2 utilizes its circular planar structure to better press against the electrode tab to be welded, thereby improving the welding quality.

[0059] In one embodiment, please refer to Figure 3 The main welding tooth 1a is provided with a first spherical structure 1c on the side near the welding seat 2. The first spherical structure 1c is a structure that is less than or equal to 1 / 2 of its sphere.

[0060] Here, by setting a first spherical structure 1c on the side of the main welding tooth 1a near the electrode tab to be welded, the spherical shape of the first spherical structure 1c can reduce the contact stress of the electrode tab to be welded when the electrode tab to be welded is pressed down, thereby reducing the damage to the workpiece to be welded.

[0061] In one embodiment, the auxiliary welding tooth 1b is truncated cone-shaped, and the main welding tooth 1a has a third circular surface and a fourth circular surface. The third circular surface is located on the side of the auxiliary welding tooth 1b close to the welding seat 2, and the fourth circular surface is located on the other side of the auxiliary welding tooth 1b opposite to the third circular surface. The diameter of the third circular surface is between 0.08 mm and 0.15 mm, and the diameter of the fourth circular surface is between 0.2 mm and 0.3 mm.

[0062] For example, the diameter of the third circular surface can be 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, or 0.15mm, etc.; the diameter of the fourth circular surface can be 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.3mm, etc.

[0063] Here, by setting a frustum-shaped auxiliary welding tooth 1b of appropriate size, on the one hand, the fourth circular surface, due to its planar structure and larger diameter, can increase the connection area between the auxiliary welding tooth 1b and the welding head 1, thereby improving the connection stability of the auxiliary welding tooth 1b; on the other hand, the third circular surface utilizes its circular planar structure to better press against the electrode tab to be welded, so as to better release stress and improve the welding quality.

[0064] In one embodiment, a second spherical structure is provided on the side of the auxiliary welding tooth 1b near the welding seat 2. The second spherical structure is a structure that is less than or equal to 1 / 2 of its sphere.

[0065] Here, by setting a second spherical structure on the side of the auxiliary welding tooth 1b near the electrode tab to be welded, the spherical shape of the second spherical structure can reduce the contact stress of the electrode tab to be welded when the electrode tab to be welded is pressed down, thereby reducing the damage to the workpiece to be welded.

[0066] For example, in one embodiment, the electrode tab to be welded can be a positive electrode tab, and the material of the positive electrode tab can be aluminum. In this way, the welding component provided by this application can effectively solve the problem that aluminum positive electrode tabs are easy to become brittle and difficult to weld. This reduces the possibility of additional tearing of the positive electrode tab due to external gripping and the occurrence of cell power failure in the stacked structure during the transition from ultrasonic welding to laser welding.

[0067] In one embodiment, the thickness of each tab layer in the tab to be welded is between 8 μm and 15 μm, and the number of tab layers in the tab to be welded is between 100 and 120.

[0068] For example, the thickness of each tab layer can be 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, or 15μm, etc. The number of tab layers can be 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, or 120, etc. The thickness of the tab to be soldered is the product of the number of tab layers and the tab thickness; for example, the thickness of the tab to be soldered is between 0.8mm and 18mm.

[0069] By setting appropriate thickness and number of layers, the energy density of the battery can be increased, thereby improving the vehicle's range.

[0070] In one embodiment, please refer to Figure 3 The tooth depth L1 of the main welding tooth 1a is between 1mm and 1.25mm.

[0071] For example, the tooth depth L1 of the main welding tooth 1a can be 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, or 1.25mm, etc. Here, by setting the main welding tooth 1a with an appropriate tooth depth, the occurrence of incomplete welds can be reduced when welding multi-layer electrode tabs, thereby improving the welding strength and quality.

[0072] It should be noted that the tooth depth direction mentioned above and the height direction mentioned below can both refer to a third direction.

[0073] In one embodiment, the tooth depth of the auxiliary welding tooth 1b is between 0.3 mm and 0.5 mm.

[0074] For example, the tooth depth of the auxiliary welding tooth 1b can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm, etc. Here, by setting the auxiliary welding tooth 1b with an appropriate tooth depth, the probability of cracking caused by the tearing force at the edge of the main welding tooth 1a when the electrode tab is pressed down during welding can be effectively reduced, thereby further improving the welding quality and yield.

[0075] In one embodiment, please refer to Figure 2 The second welding surface 2a is provided with multiple protrusions 2b that protrude towards the electrode tab to be welded, and the height of the protrusions 2b is between 0.2mm and 0.3mm.

[0076] For example, the height of the bump 2b can be 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.3mm, etc. Here, by setting multiple bumps 2b of appropriate height, on the one hand, it can facilitate the bearing of the electrode tab to be welded, reducing the possibility of the electrode tab moving during the welding process; on the other hand, it can reduce the contact between the bump 2b and the main welding tooth 1a and the auxiliary welding tooth 1b, thereby reducing over-welding; furthermore, it can improve the welding flatness of the entire electrode tab to be welded when the welding head 1 is pressed down, reduce the gap between adjacent layers in the electrode tab to be welded, and facilitate the uniform transmission of amplitude along the stacking direction of the electrode tab to be welded, thereby improving the welding strength and quality.

[0077] In one embodiment, the shape of the bump 2b is not limited. For example, the shape of the bump 2b is rhomboid when projected along a third direction. This can reduce the adhesion of the electrode tab to be welded to the solder pad 2 to a certain extent.

[0078] In one embodiment, a plurality of bumps 2b are spaced apart on the second welding surface 2a to form a bump portion, the bump portion being serrated.

[0079] For example, multiple bumps 2b can be arranged at intervals along a first direction to form bump groups, and multiple bump groups can be arranged at intervals along a second direction to form bump portions. Here, the bump portions are serrated due to the spacing of the bumps 2b and their diamond shape.

[0080] In one embodiment, the welding head 1 is made of high-speed steel. Using high-speed steel as the material for the welding head 1 allows it to meet the larger amplitude and energy requirements of the electrode to be welded to a certain extent, thereby improving welding stability.

[0081] In one embodiment, the high-speed steel is heat-treated. This heat treatment further increases the hardness of the high-speed steel, better meeting the amplitude and energy requirements of the thick-welded tabs, reducing the likelihood of weld head cracking, improving the stability of amplitude and energy transmission, thereby reducing the occurrence of incomplete welds and increasing weld strength.

[0082] In one embodiment, the electrode tab to be welded is provided with a double solder mark, and the spacing between two adjacent solder marks is between 5 mm and 10 mm.

[0083] It should be noted that the dual soldering setting here refers to the use of two steps to solder the electrode tab to be soldered. For example, one side of the electrode tab to be soldered can be soldered first along the width direction of the electrode tab to be soldered, i.e., the first direction. Then, the soldering base 2 and the probe can be moved to solder the other side of the electrode tab to be soldered along the first direction.

[0084] For example, the spacing between two adjacent solder marks along the first direction can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.

[0085] Here, by using double solder marks to weld the tabs to be welded, and by setting an appropriate spacing between two adjacent solder marks, the connection strength between the tabs to be welded can be improved, thereby improving the welding quality.

[0086] Another aspect of this application provides an ultrasonic welding apparatus, including the welding components in any of the above embodiments.

[0087] For example, the ultrasonic welding device includes a drive unit, a power supply, and wires. The positive and negative terminals of the power supply are connected to the welding head 1 and the welding base 2 respectively via wires. The drive unit is used to drive the welding head 1 to move closer to or away from the welding base 2 in a third direction.

[0088] The ultrasonic welding apparatus provided in this application, based on the advantages of the welding components, also reduces the occurrence of cracks in the electrode tabs to be welded.

[0089] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. All modifications, equivalent substitutions, improvements, etc., within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A welding assembly used in an ultrasonic welding apparatus, characterized in that, The welding assembly includes: The welding head has a first welding surface, which includes a main welding area and an auxiliary welding area. The auxiliary welding area is located around the main welding area. The main welding area is provided with main welding teeth, and the auxiliary welding area is provided with auxiliary welding teeth. The tooth depth of the main welding teeth is greater than the tooth depth of the auxiliary welding teeth. A welding base is used to support the electrode tab to be welded, and a second welding surface is formed at one end of the welding base facing the welding head, which mates with the first welding surface.

2. The welding assembly according to claim 1, characterized in that, The width direction of the electrode tab to be welded is the first direction, and the auxiliary welding area and the main welding area are arranged along the first direction.

3. The welding assembly according to claim 2, characterized in that, The number of auxiliary welding areas is two, and the two auxiliary welding areas are arranged on both sides of the main welding area along the first direction.

4. The welding assembly according to claim 3, characterized in that, The number of main welding teeth and auxiliary welding teeth is multiple. Multiple main welding teeth are arranged at intervals along the first direction to form a main welding tooth group. Multiple welding tooth groups are arranged at intervals along the second direction to form a main welding tooth section. Multiple auxiliary welding teeth on each auxiliary welding area are arranged at intervals along the second direction to form an auxiliary welding tooth group. The first direction and the second direction intersect.

5. The welding assembly according to claim 3, characterized in that, The dimension of the main welding area along the first direction is between 15mm and 22mm, and the dimension of the main welding area along the second direction is between 5mm and 7mm; The dimensions of each of the auxiliary soldering areas along the first direction are between 3 mm and 5 mm, and the dimensions of each of the auxiliary soldering areas along the second direction are between 5 mm and 7 mm, wherein the first direction and the second direction intersect.

6. The welding assembly according to claim 1, characterized in that, The main welding tooth is frustum-shaped, having a first circular surface and a second circular surface. The first circular surface is located on the side of the main welding tooth closest to the welding seat, and the second circular surface is located on the other side of the main welding tooth opposite to the first circular surface. The diameter of the first circular surface is between 0.2 mm and 0.5 mm, and the diameter of the second circular surface is between 0.6 mm and 0.9 mm; and / or, The main welding tooth has a first spherical structure on the side near the welding seat. The first spherical structure is a structure that is less than or equal to 1 / 2 of a sphere.

7. The welding assembly according to claim 1, characterized in that, The auxiliary welding tooth is frustum-shaped, and the main welding tooth has a third circular surface and a fourth circular surface. The third circular surface is located on the side of the auxiliary welding tooth closest to the welding seat, and the fourth circular surface is located on the other side of the auxiliary welding tooth opposite to the third circular surface. The diameter of the third circular surface is between 0.08 mm and 0.15 mm, and the diameter of the fourth circular surface is between 0.2 mm and 0.3 mm; and / or, The auxiliary welding tooth has a second spherical structure on the side near the welding seat. The second spherical structure is a structure that is less than or equal to 1 / 2 of a sphere.

8. The welding assembly according to claim 1, characterized in that, The electrode tab to be welded adopts a double solder mark setting, and the distance between two adjacent solder marks is between 5mm and 10mm.

9. The welding assembly according to claim 1, characterized in that, The tooth depth of the main welding tooth is between 1 mm and 1.25 mm; and / or, The depth of the auxiliary welding teeth is between 0.3 mm and 0.5 mm.

10. The welding assembly according to claim 1, characterized in that, The second welding surface is provided with a plurality of protrusions that protrude toward the electrode tab to be welded, and the height of the protrusions is between 0.2 mm and 0.3 mm.

11. The welding assembly according to claim 1, characterized in that, The welding head is made of high-speed steel.

12. The welding assembly according to claim 1, characterized in that, The thickness of each tab layer in the tab to be welded is between 8 μm and 15 μm, and the number of tab layers in the tab to be welded is between 100 and 120.

13. An ultrasonic welding apparatus, characterized in that, Includes the welding assembly as described in any one of claims 1 to 12.

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