Ultrasonic welding device

Abstract

The invention provides an ultrasonic welding device which can solve the problem that a lug and a connecting piece are extruded and raised in the welding process, so that the welding surface is smooth, the abrasion of welding teeth of the ultrasonic welding device is reduced, and the service life of the ultrasonic welding device is prolonged. The ultrasonic welding device comprises a welding head and a welding seat, the welding head comprises a welding head body and a plurality of first welding teeth, the welding head body comprises a first welding face and is provided with a plurality of first grooves, openings of the first grooves are all located in the first welding face, and the first welding teeth are all arranged on the first welding face in a protruding mode and are arranged at intervals. The first grooves and the second grooves are arranged at intervals; the welding seat comprises a welding seat body and second welding teeth, the welding seat body comprises a second welding face and is provided with a plurality of second grooves, openings of the second grooves are located in the second welding face, the second welding teeth are arranged on the second welding face in a protruding mode and arranged at intervals, and the second welding teeth and the second grooves are arranged at intervals.

Description

Technical Field

[0001] This application relates to the technical field of tab welding, and particularly to an ultrasonic welding device. Background Art

[0002] During the production of energy storage batteries or power batteries, an ultrasonic welding device is usually used to fix the plural stacked tabs of the core and the connecting piece. When welding the plural stacked tabs and the connecting piece, under the action of ultrasonic waves, the welding teeth on the ultrasonic welding device will vibrate at high frequency, and form solder joints with a certain depth on the plural stacked tabs and the connecting piece respectively, so that the plural stacked tabs and the connecting piece are welded together. However, the parts of the plural stacked tabs and the connecting piece where no solder joints are formed are usually pressed together, causing bulges on the welding surface, resulting in an uneven welding surface, increasing the wear of the welding teeth on the ultrasonic welding device, and shortening the service life of the ultrasonic welding device. Summary of the Invention

[0003] This application provides an ultrasonic welding device, which can solve the problem of extrusion bulging that occurs during the welding of plural stacked tabs and the connecting piece, make the welding surface flat, thereby reducing the wear of the welding teeth on the ultrasonic welding device and helping to extend the service life of the ultrasonic welding device.

[0004] This application provides an ultrasonic welding device, including a welding head and a welding base. The welding head includes a welding head body and a plurality of first welding teeth. The welding head body includes a first welding surface. The welding head body is provided with a plurality of first grooves, and the openings of the plurality of first grooves are all located on the first welding surface. The plurality of first welding teeth protrude from the first welding surface in a direction away from the welding head body, and are spaced apart from each other and are spaced apart from the plurality of first grooves; the welding base includes a welding base body and a plurality of second welding teeth. The welding base body includes a second welding surface. The welding base body is provided with a plurality of second grooves, and the openings of the plurality of second grooves are all located on the second welding surface. The plurality of second welding teeth protrude from the second welding surface in a direction away from the welding base body, and are spaced apart from each other and are spaced apart from the plurality of second grooves.

[0005] Wherein, along the direction of the welding head body towards the first welding teeth, the size of each first welding tooth gradually decreases; along the direction of the welding base body towards the second welding teeth, the size of each second welding tooth gradually decreases.

[0006] Among them, the multiple first grooves include multiple third grooves, multiple fourth grooves, and multiple fifth grooves. The multiple third grooves and the multiple fifth grooves are both located outside the multiple first welding teeth. Along the width direction of the welding head body, the multiple third grooves and the multiple fifth grooves are respectively located on opposite sides of the multiple first welding teeth. The multiple fourth grooves are located inside the multiple third grooves, and each fourth groove is located between two first welding teeth. The multiple second grooves include multiple sixth grooves and multiple seventh grooves. The multiple sixth grooves are all located outside the multiple second welding teeth and surround the multiple second welding teeth. The multiple seventh grooves are all located inside the multiple fifth grooves, and each seventh groove is located between two second welding teeth.

[0007] Among them, the multiple first welding teeth are arranged in a matrix, and the multiple first grooves are arranged in a matrix; the multiple second welding teeth are arranged in a matrix, and the multiple second grooves are arranged in a matrix.

[0008] Among them, along the length direction of the welding head body, the distance l1 between the centers of two adjacent first grooves is between 6 mm and 8 mm. Along the width direction of the welding head body, the distance l2 between the centers of two adjacent first grooves is between 6 mm and 8 mm. The distance l3 between the center of each first groove and an adjacent first welding tooth is between 0.6 mm and 3 mm. The diameter d1 of each first groove is between 2.5 mm and 3.5 mm. The depth h1 of each first groove is between 2.5 mm and 3.5 mm. Along the length direction of the welding seat body, the distance l4 between the centers of two adjacent second grooves is between 5 mm and 9 mm. Along the width direction of the welding seat body, the distance l5 between the centers of two adjacent second grooves is between 5 mm and 9 mm. The distance l6 between the center of each second groove and the end of an adjacent second welding tooth close to the second welding surface is between 0.6 mm and 3 mm. The diameter d2 of each second groove is between 2 mm and 3 mm. The depth h2 of each second groove is between 1.5 mm and 2.5 mm.

[0009] Among them, the multiple first welding teeth include a first welding tooth group, a second welding tooth group, and a third welding tooth group. The first welding tooth group, the second welding tooth group, and the third welding tooth group each include at least one of the first welding teeth. Along the length direction of the welding head, the first welding tooth group, the second welding tooth group, and the third welding tooth group are arranged at intervals in sequence; the multiple first grooves are all located between the first welding tooth group and the third welding tooth group; the multiple second welding teeth include a fourth welding tooth group, a fifth welding tooth group, and a sixth welding tooth group. The fourth welding tooth group, the fifth welding tooth group, and the sixth welding tooth group each include at least one of the second welding teeth. Along the length direction of the welding base, the fourth welding tooth group, the fifth welding tooth group, and the sixth welding tooth group are arranged at intervals in sequence; the multiple second grooves are all located between the fourth welding tooth group and the sixth welding tooth group.

[0010] Among them, along the length direction of the welding head body, the distance L1 between the centers of two adjacent first grooves is between 4 mm and 9 mm. Along the width direction of the welding head body, the distance L2 between the centers of two adjacent first grooves is between 4 mm and 9 mm. The distance L3 between the center of each first groove and one end of the adjacent first welding tooth close to the first welding surface is between 0.6 mm and 3 mm. The diameter D1 of each first groove is between 2 mm and 4 mm. The depth H1 of each first groove is between 2 mm and 4 mm; along the length direction of the welding base body, the distance L4 between the centers of two adjacent second grooves is between 3 mm and 10 mm. Along the width direction of the welding base body, the distance L5 between the centers of two adjacent second grooves is between 3 mm and 10 mm; the distance L6 between the center of each second groove and one end of the adjacent second welding tooth close to the second welding surface is between 0.5 mm and 3.5 mm. The diameter D2 of each second groove is between 2 mm and 4.5 mm. The depth H2 of each second groove is between 2 mm and 3.5 mm.

[0011] Among them, when the ultrasonic welding device welds the tab and the connecting piece, the welding head is located on one side of the welding base. The first welding surface and the second welding surface are arranged at intervals and oppositely. Along the height direction of the ultrasonic welding device, the orthographic projection of the first welding surface on the welding base is located within the second welding surface.

[0012] Among them, along the length direction of the welding head, the length a1 of the welding head body is between 18 mm and 22 mm, and along the width direction of the welding head, the width b1 of the welding head body is between 8 mm and 12 mm; along the length direction of the welding base, the length a2 of the welding base body is between 22 mm and 26 mm, and along the width direction of the welding base, the length b2 of the welding base body is between 12 mm and 16 mm.

[0013] Among them, the welding head further includes a connecting arm, the connecting arm is fixedly connected to one side of the welding head body and intersects with the welding head body; along the height direction of the welding head, the first welding surface protrudes relative to the connecting arm.

[0014] In the ultrasonic welding device provided by the embodiment of the present application, by providing a first groove on the welding head and a second groove on the welding base, an expansion space can be provided for the parts of the plurality of stacked tab ears and connecting pieces where no solder joints are formed, so that the stress generated by extrusion on the parts of the plurality of stacked tab ears and connecting pieces where no solder joints are formed can be released through the first groove and the second groove. Under this setting, it is possible to avoid additional stress concentration problems inside the plurality of stacked tab ears and connecting pieces due to extrusion, ensure that the welding surface is flat, reduce the wear of the first welding teeth and the second welding teeth during the welding process of the plurality of stacked tab ears and connecting pieces, thereby helping to extend the service life of the ultrasonic welding device, and also improving the appearance effect of the plurality of stacked tab ears and connecting pieces after welding. At the same time, the risk of rupture of the plurality of stacked tab ears during the welding process can also be eliminated, which is beneficial to ensuring the use performance of the wound core in the energy storage battery or the power battery, achieving the purpose of cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments of the present application will be described below.

[0016] Figure 1 is a partial structural schematic diagram of an ultrasonic welding device provided by an embodiment of the present application;

[0017] Figure 2 is Figure 1 a structural schematic diagram of the welding head in the first embodiment of the ultrasonic welding device shown;

[0018] Figure 3 is Figure 2 a structural schematic diagram of the welding head shown from another angle;

[0019] Figure 4 is Figure 2 a partial cross-sectional structural schematic diagram of the welding head shown after being cut along A-A;

[0020] Figure 5 is Figure 1 The schematic structural diagram of the welding base in the first embodiment of the ultrasonic welding device shown;

[0021] Figure 6 is Figure 5 The schematic structural diagram of the welding base shown from another angle;

[0022] Figure 7 is Figure 5 The partial sectional structural diagram of the welding base shown after being cut along B-B;

[0023] Figure 8 is Figure 1 The schematic structural diagram of the welding head in the second embodiment of the ultrasonic welding device shown;

[0024] Figure 9 is Figure 8 The schematic structural diagram of the welding head shown from another angle;

[0025] Figure 10 is Figure 8 The partial sectional structural diagram of the welding head shown after being cut along C-C;

[0026] Figure 11 is Figure 1 The schematic structural diagram of the welding base in the second embodiment of the ultrasonic welding device shown;

[0027] Figure 12 is Figure 11 The schematic structural diagram of the welding base shown from another angle;

[0028] Figure 13 is Figure 11 The partial sectional structural diagram of the welding head shown after being cut along D-D;

[0029] Figure 14 It is the schematic flow diagram of the welding method of the ultrasonic welding device provided by the embodiment of the present application.

[0030] The names corresponding to the reference numerals in the figure are as follows:

[0031] Ultrasonic welding device 100, welding head 110, welding base 120, welding head body 10, first welding teeth 20, connecting arm 30, first welding surface 101, first groove 11, third groove 11a, fourth groove 11b, fifth groove 11c, base 40, welding base body 50, second welding teeth 60, second welding surface 501, second groove 51, sixth groove 51a, seventh groove 51b, first welding tooth group 20a, second welding tooth group 20b, third welding tooth group 20c, fourth welding tooth group 60a, fifth welding tooth group 60b, sixth welding tooth group 60c. Detailed implementation manners

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0033] Please refer to Figure 1 , Figure 1 , which is a partial structural schematic diagram of an ultrasonic welding device 100 provided by an embodiment of the present application. Among them, for the convenience of description, the length direction of the ultrasonic welding device 100 is defined as the X-axis direction, the width direction of the ultrasonic welding device 100 is defined as the Y-axis direction, and the height direction of the ultrasonic welding device 100 is defined as the Z-axis direction, and the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other in pairs.

[0034] In this embodiment, the ultrasonic welding device 100 can be used to weld the tabs (not shown in the figure) and connecting pieces (not shown in the figure) of the winding core in a storage battery or a power battery. In this embodiment, the ultrasonic welding device 100 includes a base (not shown in the figure), a welding head 110, and a welding seat 120, and both the welding head 110 and the welding seat 120 are installed on the base. When the ultrasonic welding device 100 welds the tabs and the connecting pieces, the welding head 110 is located on one side of the welding seat 120 and is spaced apart and oppositely arranged with the welding seat 120. Along the height direction (the Z-axis direction shown in the figure) of the ultrasonic welding device 100, the orthographic projection of the welding head 110 on the welding seat 120 is located within the end face of the welding seat 120 facing the welding head 110. Among them, the welding seat 120 can play a supporting role for the tabs and the connecting pieces.

[0035] Please refer to in combination Figure 2 , Figure 3 and Figure 4 , Figure 2 is Figure 1 a structural schematic diagram of the welding head 110 in the first embodiment of the ultrasonic welding device 100 shown, Figure 3 is Figure 2 a structural schematic diagram of the welding head 110 shown from another angle, Figure 4 is Figure 2 a partial sectional structural schematic diagram of the welding head 110 after being cut along the A-A position. Among them, "cut along the A-A position" means cutting along the plane where the A-A line is located, and similar descriptions in the following can be understood in the same way.

[0036] The welding head 110 includes a welding head body 10, a first welding tooth 20, and a connecting arm 30. The first welding tooth 20 is fixedly connected to the welding head body 10. The welding head body 10 is fixedly connected to one side of the connecting arm 30 and intersects with the connecting arm 30. Exemplarily, the connecting arm 30 is perpendicularly arranged with respect to the welding head body 10. In this embodiment, the connecting arm 30 is generally cylindrical. One end of the connecting arm 30 away from the welding head body 10 can be connected to other components such as the base of the ultrasonic welding device 100. The connecting arm 30 can fix and support the welding head body 10. Exemplarily, the connecting arm 30 and the welding head body 10 can be integrally formed, which is convenient for processing and manufacturing. In some other embodiments, the welding head body 10 and the connecting arm 30 can also be separately formed.

[0037] In this embodiment, along the length direction of the welding head 110 (the X-axis direction shown in the figure), the length a1 of the welding head body 10 is between 18 mm and 22 mm. Along the width direction of the welding head 110 (the X-axis direction shown in the figure), the width b1 of the welding head body 10 is between 8 mm and 12 mm. Among them, the welding head body 10 includes a first welding surface 101. The first welding surface 101 is used to fix the first welding tooth 20. Along the height direction of the welding head body 10 (the Z-axis direction shown in the figure), the first welding surface 101 protrudes relative to the connecting arm 30, so that the first welding tooth 20 arranged on the first welding surface 101 can weld a plurality of stacked tabs and connecting pieces. Exemplarily, there are two first welding surfaces 101. Along the height direction of the welding head body 10 (the Z-axis direction shown in the figure), the two first welding surfaces 101 are arranged back to back and both protrude relative to the connecting arm 30. In some other embodiments, the number of the first welding surfaces 101 can also be one, three or more than three.

[0038] In this embodiment, the welding head body 10 is further provided with a first groove 11. The opening of the first groove 11 is located on the first welding surface 101. The first groove 11 is recessed from the first welding surface 101 towards the inside of the welding head body 10. Exemplarily, the first groove 11 is a circular groove. Among them, the diameter d1 of the first groove 11 is between 2.5 mm and 3.5 mm, and the depth h1 of the first groove 11 is between 2.5 mm and 3.5 mm.

[0039] In this embodiment, there are multiple first grooves 11. The multiple first grooves 11 are arranged at intervals from each other. Exemplarily, the multiple first grooves 11 are arranged in a matrix. In this embodiment, multiple first grooves 11 are provided at both ends in the length direction (the illustrated Z-axis direction) of the welding head body 10. Among them, along the length direction (the illustrated X-axis direction) of the welding head body 10, the distance l1 between the centers of two adjacent first grooves 11 is between 6 mm and 8 mm. Along the width direction (the illustrated Y-axis direction) of the welding head body 10, the distance l2 between the centers of two adjacent first grooves 11 is between 6 mm and 8 mm. Herein, the center of the first groove 11 refers to the opening at the center of the first groove 11, and the same understanding can be made for similar descriptions hereinafter.

[0040] The multiple first grooves 11 include multiple third grooves 11a, multiple fourth grooves 11b, and multiple fifth grooves 11c. The multiple third grooves 11a and the multiple fifth grooves 11c are both located outside the first welding teeth 20. Along the width direction of the welding head body 10, the multiple third grooves 11a and the multiple fifth grooves 11c are respectively located on opposite sides of the first welding teeth 20. The multiple fourth grooves 11b are located inside the multiple third grooves 11a.

[0041] In this embodiment, the first welding teeth 20 protrude from the first welding surface 101 of the welding head body 10 in a direction away from the welding head body 10, and are arranged at intervals from the first grooves 11 of the welding head body 10. When there are two first welding surfaces 101, each first welding surface 101 is provided with first welding teeth 20. With this arrangement, when the first welding teeth 20 on one first welding surface 101 are worn during use, the first welding teeth 20 on the other first welding surface 101 can be continued to be used for welding without replacing the new welding head 110, thereby helping to extend the service life of the welding head 110.

[0042] In this embodiment, the first welding teeth 20 are frustum-shaped. Among them, the tooth height f1 of the first welding teeth 20 is between 0.2 mm and 1.5 mm. Along the direction from the welding head body 10 to the first welding teeth 20, the size of the first welding teeth 20 gradually decreases. Among them, the diameter c1 of the end of the first welding teeth 20 close to the first welding surface 101 is between 1 mm and 1.6 mm, and the diameter c2 of the end of the first welding teeth 20 far from the first welding surface 101 is between 0.3 mm and 0.6 mm. Exemplarily, the end surface of the end of the first welding teeth 20 far from the first welding surface 101 is a plane to prevent the first welding teeth 20 from piercing the tab and the connecting piece.

[0043] In this embodiment, there are multiple first welding teeth 20. The multiple first welding teeth 20 are spaced apart from each other and are also spaced apart from the multiple first grooves 11. Exemplarily, the multiple first welding teeth 20 are arranged in a matrix. Among them, the distance l3 between one end of each first welding tooth 20 close to the first welding surface 101 and the center of an adjacent first groove 11 is between 0.6 mm and 3 mm. In addition, the multiple first welding teeth 20 are located between the multiple third grooves 11a and the multiple fifth grooves 11c. In other words, the multiple third grooves 11a and the multiple fifth grooves 11c are both located outside the multiple first welding teeth 20. Along the width direction of the welding head body 10, the multiple third grooves 11a and the multiple fifth grooves 11c are respectively located on opposite sides of the multiple first welding teeth 20, so that the stress generated during the welding of the plural stacked tabs and the connecting pieces can be released to the outside of the welding head 110 through the multiple third grooves 11a. There is one fourth groove 11b between two first welding teeth 20. In other words, each fourth groove 11b is located between two first welding teeth 20.

[0044] Please refer to Figure 5 、 Figure 6 and Figure 7 , Figure 5 is Figure 1 the schematic structural diagram of the welding base 120 in the first embodiment in the ultrasonic welding device 100 shown in Figure 6 is Figure 5 the schematic structural diagram of the welding base 120 shown in another angle, Figure 7 is Figure 5 the partial sectional structural diagram of the welding base 120 shown in the section along B - B.

[0045] The welding base 120 includes a base 40, a welding base body 50 and second welding teeth 60. The second welding teeth 60 are fixedly connected to the welding base body 50, and the welding base body 50 is fixedly connected to the base 40. Among them, the base 40 can support and fix the welding base body 50, so as to facilitate the fixed installation of the welding base body 50.

[0046] In this embodiment, along the length direction of the welding base 120 (the X-axis direction shown in the figure), the length a2 of the welding base body 50 is between 22 mm and 26 mm. Along the width direction of the welding base 120 (the X-axis direction shown in the figure), the length b2 of the welding base body 50 is between 12 mm and 16 mm. Under this setting, when the ultrasonic welding device 100 welds the plural stacked tabs and the connecting pieces, along the height direction of the ultrasonic welding device 100, it can be ensured that the orthographic projection of the first welding surface 101 of the welding head body 10 on the welding base 120 is located within the second welding surface 501, so as to ensure that one end of the welding head body 10 facing the welding base body 50 can fully act on the welding base body 50 during the welding process, ensuring better welding effect.

[0047] The socket body 50 includes a second welding surface 501. Exemplarily, the second welding surface 501 is arranged facing the welding head 110. The second welding surface 501 is used to fix the second welding teeth 60. The socket body 50 is further provided with a second groove 51. The opening of the second groove 51 is located on the second welding surface 501, and the second groove 51 is recessed from the second welding surface 501 towards the inside of the socket body 50. Exemplarily, the second groove 51 is a circular groove. Wherein, the diameter d2 of the opening of the second groove 51 is between 2 mm and 3 mm, and the depth h2 of the second groove 51 is between 1.5 mm and 2.5 mm.

[0048] In this embodiment, there are multiple second grooves 51. The multiple second grooves 51 are arranged at intervals from each other. Exemplarily, the multiple second grooves 51 are arranged in a matrix. Wherein, along the length direction of the socket body 50 (the X-axis direction shown in the figure), the distance l4 between the centers of two adjacent second grooves 51 is between 5 mm and 9 mm. Along the width direction of the socket body 50 (the Y-axis direction shown in the figure), the distance l5 between the centers of two adjacent second grooves 51 is between 5 mm and 9 mm. In addition, the multiple second grooves 51 include multiple sixth grooves 51a and multiple seventh grooves 51b. The multiple sixth grooves 51a are located outside the second welding teeth 60 and surround the second welding teeth 60. The multiple seventh grooves 51b are located inside the multiple second welding teeth 60.

[0049] In this embodiment, the second welding teeth 60 protrude from the second welding surface 501 in a direction away from the socket body 50 and are arranged at intervals from the second groove 51 of the welding head body 10. Exemplarily, the second welding teeth 60 are in a square pyramid shape. Wherein, the tooth height f2 of the second welding teeth 60 is between 0.6 mm and 1.3 mm. Along the direction from the socket body 50 to the second welding teeth 60, the dimension in the length direction (the X-axis direction shown in the figure) of the second welding teeth 60 gradually decreases. Wherein, along the length direction of the socket 120 (the Y-axis direction shown in the figure), the length c3 of the end of the second welding teeth 60 close to the second welding surface 501 is between 1.2 mm and 2 mm, and the length c4 of the end of the second welding teeth 60 far from the second welding surface 501 is between 0.2 mm and 0.4 mm. Exemplarily, the end surface of the end of the second welding teeth 60 far from the second welding surface 501 is a square plane to prevent the second welding teeth 60 from piercing the tab and the connecting piece.

[0050] In this embodiment, there are multiple second welding teeth 60. The multiple second welding teeth 60 are arranged at intervals from each other and are arranged at intervals from the multiple second grooves. Exemplarily, the multiple second welding teeth 60 are arranged in a matrix. Wherein, the distance l6 between the end of each second welding tooth 60 close to the second welding surface 501 and the center of the opening of an adjacent second groove 51 is between 0.6 mm and 3 mm.

[0051] In addition, multiple second welding teeth 60 are all located inside multiple sixth grooves 51a. In other words, multiple sixth grooves 51a are all located outside multiple second welding teeth 60 and are arranged around multiple second welding teeth 60, so that the stress generated during the welding process of the tab and the connecting piece can be released to the outside of the welding seat 120 through multiple sixth grooves 51a. A seventh groove 51b is provided between two second welding teeth 60. In other words, each seventh groove 51b is located between two second welding teeth 60.

[0052] It can be understood that during the welding process of the tab and the connecting piece by the ultrasonic welding device 100, the first welding teeth 20 of the welding head 110 and the second welding teeth 60 of the welding seat 120 press the tab and the connecting piece tightly, and form multiple welding spots on the tab and the connecting piece respectively. Under the action of pressure, the tab and the connecting piece form a stable and reliable connection, thus realizing a fixed connection. During this process, the parts of the tab and the connecting piece where no welding spots are formed are usually pressed together. In this embodiment, by providing the first groove 11 on the welding head 110 and the second groove 51 on the welding seat 120, it is possible to provide a stretching space for the parts of the tab and the connecting piece where no welding spots are formed, so that the stress generated by the extrusion of the parts of the tab and the connecting piece where no welding spots are formed can be released through the first groove 11 and the second groove 51. In this setting, it is possible to avoid additional stress concentration problems inside the tab and the connecting piece due to extrusion, ensure the flatness of the welding surface, reduce the wear of the first welding teeth 20 and the second welding teeth 60 during the welding process of the tab and the connecting piece, thereby helping to extend the service life of the ultrasonic welding device 100, and also improving the appearance effect of the tab and the connecting piece after welding. At the same time, it is also possible to eliminate the risk of the tab in the tab and the connecting piece breaking during the welding process, which is beneficial to ensuring the use performance of the core in the energy storage battery or the power battery, and achieving the purpose of cost reduction and efficiency improvement.

[0053] Please refer to Figure 8 、 Figure 9 and Figure 10 , Figure 8 is Figure 1 the schematic structural diagram of the welding head 110 in the ultrasonic welding device 100 shown in the second embodiment, Figure 9 is Figure 8 the schematic structural diagram of the welding head 110 shown in another angle, Figure 10 is Figure 8 the partial sectional structural diagram of the welding head 110 shown after being cut along C-C.

[0054] The difference between the welding head 110 of the ultrasonic welding device 100 shown in this embodiment and the welding head 110 of the ultrasonic welding device 100 shown in the first embodiment above is that the plurality of first welding teeth 20 include a first welding tooth group 20a, a second welding tooth group 20b, and a third welding tooth group 20c. The first welding tooth group 20a, the second welding tooth group 20b, and the third welding tooth group 20c each include at least one first welding tooth 20. Along the length direction of the welding head 110, the first welding tooth group 20a, the second welding tooth group 20b, and the third welding tooth group 20c are arranged at intervals in sequence.

[0055] In this embodiment, the plurality of first welding teeth 20 are all frustum-shaped. The tooth height F1 of each first welding tooth 20 is between 0.4 mm and 1.8 mm. Along the direction from the welding head body 10 to the first welding teeth 20, the size of each first welding tooth 20 gradually decreases. Among them, the diameter C1 of one end of each first welding tooth 20 close to the first welding surface 101 is between 1.2 mm and 1.8 mm, and the diameter C2 of one end of each first welding tooth 20 far from the first welding surface 101 is between 0.4 mm and 0.8 mm.

[0056] In this embodiment, the first grooves 11 are all circular grooves. Among them, the diameter D1 of each first groove 11 is between 2.5 mm and 3.5 mm, and the depth H1 of each first groove 11 is between 2.5 mm and 3.5 mm. Exemplarily, there are a plurality of first grooves 11. The plurality of first grooves 11 are arranged at intervals from each other, and are all located between the first welding tooth group 20a and the third welding tooth group 20c, so that the stress generated by the tab and the connecting piece during the welding process is released to the inside of the welding head body 10 through the plurality of first grooves 11. Among them, along the length direction (the illustrated X-axis direction) of the welding head body 10, the distance L1 between the centers of two adjacent first grooves 11 is between 4 mm and 9 mm. Along the width direction (the illustrated Y-axis direction) of the welding head body 10, the distance L2 between the centers of the openings of two adjacent first grooves 11 is between 4 mm and 9 mm. The distance L3 between the center of each first groove 11 and one end of an adjacent first welding tooth 20 close to the first welding surface 101 is between 0.6 mm and 3 mm.

[0057] Please refer to Figure 11 、 Figure 12 and Figure 13 , Figure 11 is Figure 1 the schematic structural diagram of the welding base 120 in the second embodiment in the ultrasonic welding device 100 shown, Figure 12 is Figure 11 the schematic structural diagram of the welding base 120 shown from another angle, Figure 13 is Figure 11 the partial sectional structural diagram of the welding head 110 shown after being cut along D-D.

[0058] The difference between the welding base 120 of the ultrasonic welding device 100 shown in this embodiment and the welding base 120 of the ultrasonic welding device 100 shown in the first embodiment above is that the multiple second welding teeth 60 include a fourth welding tooth group 60a, a fifth welding tooth group 60b, and a sixth welding tooth group 60c. The fourth welding tooth group 60a, the fifth welding tooth group 60b, and the sixth welding tooth group 60c each include at least one second welding tooth 60. Along the length direction of the welding base 120, the fourth welding tooth group 60a, the fifth welding tooth group 60b, and the sixth welding tooth group 60c are arranged at intervals in sequence.

[0059] In this embodiment, the multiple second welding teeth 60 are all in the shape of a square pyramid. The tooth height F2 of each second welding tooth 60 is between 0.5 mm and 1.5 mm. Along the direction from the welding base body 50 to the second welding teeth 60, the size of each second welding tooth 60 gradually decreases. Among them, along the length direction of the welding base 120 (the X-axis direction shown in the figure), the length L1 of one end of each second welding tooth 60 close to the second welding surface 501 is between 1.3 mm and 1.9 mm, and the length L2 of one end of each second welding tooth 60 far from the second welding surface 501 is between 0.3 mm and 0.9 mm.

[0060] In this embodiment, the second grooves 51 are all circular grooves. Among them, the diameter D2 of the second grooves 51 is between 2 mm and 3 mm, and the depth H1 of the first groove 11 is between 1.5 mm and 2.5 mm. Exemplarily, there are multiple second grooves 51. The multiple second grooves 51 are arranged at intervals with each other, and are all located between the fourth welding tooth group 60a and the sixth welding tooth group 60c, so that the stress generated during the welding process of the tab and the connecting piece is released to the inside of the welding base body 50 through the multiple second grooves 51. Among them, along the length direction of the welding base body 50 (the X-axis direction shown in the figure), the distance L4 between the centers of two adjacent second grooves 51 is between 3 mm and 10 mm. Along the width direction of the welding base body 50 (the Y-axis direction shown in the figure), the distance L5 between the centers of the openings of two adjacent second grooves 51 is between 3 mm and 10 mm. The distance L6 between the center of each second groove 51 and one end of an adjacent second welding tooth 60 close to the second welding surface 501 is between 0.5 mm and 3.5 mm.

[0061] In this embodiment, by optimizing the arrangement of the first welding teeth 20 and the second welding teeth 60 in the ultrasonic welding device 100, the plurality of first grooves 11 are all located between the first welding tooth group 20a and the third welding tooth group 20c, and the plurality of second grooves 51 are all located between the fourth welding tooth group 60a and the sixth welding tooth group 60c, so that the stress generated by the extrusion of the part of the pole ear and the connecting sheet where the welding point is not formed can be released toward the inside of the ultrasonic welding device 100. Under this setting, it is possible to avoid the problem of additional stress concentration inside the pole ear and the connecting sheet due to extrusion, ensure the flatness of the welding surface, reduce the wear of the pole ear and the connecting sheet on the first welding teeth 20 and the second welding teeth 60 during the welding process, thereby helping to extend the service life of the ultrasonic welding device 100, and also improve the appearance of the pole ear and the connecting sheet after welding. At the same time, it is also possible to eliminate the risk of the pole ear in the pole ear and the connecting sheet breaking during the welding process, which is conducive to ensuring the performance of the energy storage battery and achieving the purpose of reducing costs and increasing efficiency.

[0062] See also Figure 14 , Figure 14 It is a schematic flow chart of a welding method of the ultrasonic welding device 100 provided in an embodiment of the present application.

[0063] The present application also provides a welding method of an ultrasonic welding device 100 for welding a plurality of stacked tabs and connecting sheets.

[0064] Step S1, providing an ultrasonic welding device 100, a plurality of stacked tabs and a connecting sheet. The ultrasonic welding device 100 includes a welding head 110 and a welding seat 120. The welding head 110 is located on one side of the welding seat 120, and is spaced and arranged opposite to the welding seat 120. The welding head 110 includes a welding head body 10 and a first welding tooth 20. Specifically, the welding head body 10 includes a first welding surface 101 facing the welding seat 120, and the first welding tooth 20 is arranged on the first welding surface 101, and the welding seat 120 includes a welding seat body 50 and a second welding tooth 60. Specifically, the welding seat body 50 includes a second welding surface 501 facing the welding head 110, and the second welding tooth 60 is arranged on the second welding surface 501.

[0065] Step S2 , stacking a plurality of electrode tabs and connecting sheets between the first welding teeth 20 and the second welding teeth 60 .

[0066] In step S2 , the connecting piece is located on the side of the second welding tooth 60 away from the second welding surface 501 . The plurality of stacked tabs are located on the surface of the connecting piece away from the second welding tooth 60 and on the side of the first welding tooth 20 away from the first welding surface 101 .

[0067] Step S3, the first welding teeth 20 and the second welding teeth 60 press the plurality of stacked electrode tabs and the connecting sheet to weld the plurality of stacked electrode tabs and the connecting sheet together.

[0068] In the above step S3, the first welding teeth 20 of the welding head 110 are in contact with a plurality of stacked tab ears, and the second welding teeth 60 of the welding base 120 are in contact with the connecting piece, so as to clamp the plurality of stacked tab ears and the connecting piece between the first welding teeth 20 and the second welding teeth 60. Under the action of ultrasonic waves, the first welding teeth 20 and the second welding teeth 60 vibrate at high frequency. The plurality of stacked tab ears and the connecting piece vibrate reciprocally under the drive of the first welding teeth 20 and the second welding teeth 60. At this time, the molecules at the interface where the plurality of stacked tab ears are in contact with the connecting piece penetrate each other, so that the plurality of stacked tab ears and the connecting piece are firmly welded together.

[0069] The above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should be covered by the protection scope of the present application; without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An ultrasonic welding device, characterized in that, It includes a welding head and a welding seat. The welding head includes a welding head body and a plurality of first welding teeth. The welding head body includes a first welding surface. The welding head body is provided with a plurality of first grooves, and the openings of the plurality of first grooves are all located on the first welding surface. The plurality of first welding teeth are all protruded from the first welding surface in a direction away from the welding head body, and are spaced from each other and spaced from the plurality of first grooves. The welding seat includes a welding seat body and a plurality of second welding teeth. The welding seat body includes a second welding surface. The welding seat body is provided with a plurality of second grooves, and the openings of the plurality of second grooves are all located on the second welding surface. The plurality of second welding teeth are all protruded from the second welding surface in a direction away from the welding seat body, and are spaced from each other and spaced from the plurality of second grooves.

2. The ultrasonic welding device according to claim 1, wherein In the direction of the first welding teeth along the welding head body, the size of each of the first welding teeth gradually decreases. In the direction of the second welding teeth along the welding seat body, the size of each of the second welding teeth gradually decreases.

3. The ultrasonic welding device according to claim 1 or 2, characterized in that The plurality of first grooves include a plurality of third grooves, a plurality of fourth grooves and a plurality of fifth grooves. The plurality of third grooves and the plurality of fifth grooves are both located outside the plurality of first welding teeth. In the width direction of the welding head body, the plurality of third grooves and the plurality of fifth grooves are respectively located on opposite sides of the plurality of first welding teeth. The plurality of fourth grooves are located inside the plurality of third grooves, and each of the fourth grooves is located between two of the first welding teeth. The plurality of second grooves include a plurality of sixth grooves and a plurality of seventh grooves. The plurality of sixth grooves are all located outside the plurality of second welding teeth and surround the plurality of second welding teeth. The plurality of seventh grooves are all located inside the plurality of sixth grooves, and each of the seventh grooves is located between two of the second welding teeth.

4. The ultrasonic welding device according to claim 3, wherein, The plurality of first welding teeth are arranged in a matrix, and the plurality of first grooves are arranged in a matrix. The plurality of second welding teeth are arranged in a matrix, and the plurality of second grooves are arranged in a matrix.

5. The ultrasonic welding device according to claim 4, characterized in that, In the length direction of the welding head body, the distance l1 between the centers of two adjacent first grooves is between 6 mm and 8 mm. In the width direction of the welding head body, the distance l2 between the centers of two adjacent first grooves is between 6 mm and 8 mm. The distance l3 between the center of each first groove and an adjacent first welding tooth is between 0.6 mm and 3 mm. The diameter d1 of each first groove is between 2.5 mm and 3.5 mm. The depth h1 of each first groove is between 2.5 mm and 3.5 mm. In the length direction of the welding seat body, the distance l4 between the centers of two adjacent second grooves is between 5 mm and 9 mm. In the width direction of the welding seat body, the distance l5 between the centers of two adjacent second grooves is between 5 mm and 9 mm. The distance l6 between the center of each second groove and one end of an adjacent second welding tooth close to the second welding surface is between 0.6 mm and 3 mm. The diameter d2 of each second groove is between 2 mm and 3 mm. The depth h2 of each second groove is between 1.5 mm and 2.5 mm.

6. The ultrasonic welding device according to claim 1 or 2, characterized in that, The multiple first welding teeth include a first welding tooth group, a second welding tooth group, and a third welding tooth group. The first welding tooth group, the second welding tooth group, and the third welding tooth group each include at least one first welding tooth. In the length direction of the welding head, the first welding tooth group, the second welding tooth group, and the third welding tooth group are arranged at intervals in sequence. The multiple first grooves are all located between the first welding tooth group and the third welding tooth group. The multiple second welding teeth include a fourth welding tooth group, a fifth welding tooth group, and a sixth welding tooth group. The fourth welding tooth group, the fifth welding tooth group, and the sixth welding tooth group each include at least one second welding tooth. In the length direction of the welding seat, the fourth welding tooth group, the fifth welding tooth group, and the sixth welding tooth group are arranged at intervals in sequence. The multiple second grooves are all located between the fourth welding tooth group and the sixth welding tooth group.

7. The ultrasonic welding device according to claim 6, wherein, In the length direction of the welding head body, the distance L1 between the centers of two adjacent first grooves is between 4 mm and 9 mm. In the width direction of the welding head body, the distance L2 between the centers of two adjacent first grooves is between 4 mm and 9 mm. The distance L3 between the center of each first groove and one end of an adjacent first welding tooth close to the first welding surface is between 0.6 mm and 3 mm. The diameter D1 of each first groove is between 2 mm and 4 mm. The depth H1 of each first groove is between 2 mm and 4 mm. In the length direction of the welding seat body, the distance L4 between the centers of two adjacent second grooves is between 3 mm and 10 mm. In the width direction of the welding seat body, the distance L5 between the centers of two adjacent second grooves is between 3 mm and 10 mm. The distance L6 between the center of each second groove and one end of an adjacent second welding tooth close to the second welding surface is between 0.5 mm and 3.5 mm. The diameter D2 of each second groove is between 2 mm and 4.5 mm. The depth H2 of each second groove is between 2 mm and 3.5 mm.

8. The ultrasonic welding device according to claim 1, characterized in that, When the ultrasonic welding device welds the tab and the connecting piece, the welding head is located on one side of the welding seat. The first welding surface and the second welding surface are arranged at intervals and opposite to each other. In the height direction of the ultrasonic welding device, the orthographic projection of the first welding surface on the welding seat is located within the second welding surface.

9. The ultrasonic welding device according to claim 8, characterized in that, In the length direction of the welding head, the length a1 of the welding head body is between 18 mm and 22 mm, and in the width direction of the welding head, the width b1 of the welding head body is between 8 mm and 12 mm; In the length direction of the welding base, the length a2 of the welding base body is between 22 mm and 26 mm, and in the width direction of the welding base, the length b2 of the welding base body is between 12 mm and 16 mm.

10. The ultrasonic welding device according to claim 1, characterized in that, The welding head further includes a connecting arm, which is fixedly connected to one side of the welding head body and intersects with the welding head body; In the height direction of the welding head, the first welding surface protrudes relative to the connecting arm.

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