Welding head, welding device and battery production system

Abstract

The utility model relates to a welding head, a welding device and a battery production system.The welding head is used for welding tabs and comprises a body and main welding teeth, the body is provided with a welding area, and the main welding teeth are arranged in the welding area in a protruding mode; wherein the number of the main welding teeth is at least two, all the main welding teeth form at least two rows, and the main welding teeth in the two adjacent rows are distributed in a staggered mode. The welding device comprises a mounting frame and the welding head, wherein the welding head is fixed on the mounting frame. The battery production system comprises the welding device. According to the welding head, the welding device and the battery production system, the number of the main welding teeth can be increased in an effective space, when the welding head is used for conducting ultrasonic welding on a tab, the contact area between the welding head and the tab can be increased, the welding effect of the tab is enhanced, the situation that stress on the side edge of the tab is concentrated in the ultrasonic welding process can be improved, and the production efficiency is improved. And the cracking probability of the tabs during welding is reduced, and the welding quality of the tabs is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a welding head, a welding device and a battery production system. Background Art

[0002] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance, etc. of new energy vehicles are increasingly attracting people's attention and attention. Batteries, as the power energy of new energy vehicles, are widely used.

[0003] Currently, the tab is the core current collector component of a power battery, playing an important role in current transfer and diversion. Typically, the multi-layer tabs of a power battery are first connected to the adapter using an ultrasonic welding head, and then the adapter is connected to the top cover using laser welding, thereby effectively connecting the tab and the top cover. When welding the tab with an ultrasonic welding head, the high vibration and friction of the welding teeth often cause excessive local stress in the tab, causing the tab to deform, resulting in damage or breakage, and a high probability of the tab cracking during welding. Utility Model Content

[0004] Based on this, it is necessary to provide a welding head, a welding device and a battery production system to address the problem that the tabs are prone to cracking when the existing welding heads are used to weld the tabs.

[0005] A welding head for welding a tab, comprising a main body and main welding teeth, the main body having a welding area, the main welding teeth protruding from the welding area; wherein the number of main welding teeth is at least two, all of which form at least two rows, and the main welding teeth in two adjacent rows are staggered. In the welding head described above, all of the main welding teeth form at least two rows, and the main welding teeth in two adjacent rows are staggered, which can increase the number of main welding teeth within the effective space. When the welding head is used to ultrasonically weld the tab, not only can the contact area between the welding head and the tab be increased, thereby enhancing the welding effect of the tab, but also stress concentration on the side of the tab during ultrasonic welding can be improved, thereby reducing the probability of cracking during tab welding and effectively improving the welding quality of the tab.

[0006] In some embodiments, all main welding teeth are formed into at least two rows in a first direction, where the first direction is the width direction of the welding head; the main welding teeth in the same row are equally spaced along a second direction, where the second direction is the length direction of the welding head; the width of the welding area is b, the diameter of each main welding tooth is d, the spacing between two adjacent main welding teeth in the same row is c, the position offset of the main welding teeth in two adjacent rows in the second direction is B=(d+c) / 2, and the spacing between the main welding teeth in two adjacent rows in the first direction is A=3. 1 / 2 / 2*(d+c); where the total number of rows of main welding teeth in the first direction, M, is equal to (bB) / A+1, with M rounded down. In this way, the main welding teeth in the same row are evenly spaced along the second direction, while the main welding teeth in two adjacent rows are staggered. By setting the above parameters, the total number of rows of main welding teeth, M, in the first direction can be determined. This allows the number of main welding teeth to be increased as much as possible within the available space, thereby increasing the contact area between the welding head and the tab and enhancing the tab welding effect.

[0007] In some embodiments, the length of the welding zone is a, and the number of main welding teeth in each row is N = a / (d + c). When the total number of rows of main welding teeth M is an odd number, the total number of main welding teeth Q = MN + (M - 1) / 2; when the total number of rows of main welding teeth M is an even number, the total number of main welding teeth Q = MN + M / 2. Thus, by setting the above parameters, the total number of main welding teeth can be determined, and the number of main welding teeth can be increased as much as possible within the available space, which helps to increase the contact area between the welding head and the tab, thereby enhancing the tab welding effect.

[0008] In some embodiments, each main welding tooth is configured as a hemispherical structure protruding from the welding area. Thus, when ultrasonically welding the tab using the welding head, the protruding tip of each main welding tooth will first contact the tab, which can provide more deformation space for the tab, effectively reducing the pulling force on the tab and lowering the probability of the tab cracking during welding.

[0009] In some embodiments, the welding head further includes auxiliary welding teeth, with at least one auxiliary welding tooth protruding from the outer surface of any main welding tooth. Thus, by protruding the auxiliary welding teeth from the outer surfaces of the main welding teeth, when the welding head ultrasonically welds the tab, the contact between the outer surfaces of the auxiliary welding teeth and the tab can provide the tab with more deformation space, increase the deformation margin of the tab, provide the tab with deformation space, effectively reduce the pulling force on the tab, and further reduce the probability of the tab cracking during welding.

[0010] In some embodiments, the secondary welding teeth are configured as spherical structures protruding from the outer surfaces of the primary welding teeth. By configuring each secondary welding tooth as a protruding spherical structure, when ultrasonically welding a tab using a welding head, the protruding tip of each secondary welding tooth will first contact the tab, giving the tab more room to deform, further effectively reducing the pulling force on the tab and lowering the probability of tab cracking during welding.

[0011] In some embodiments, the diameter of the secondary welding teeth is h, the diameter of the main welding teeth is d, and 0.2d≤h≤0.5d. Thus, by limiting the ratio of the diameter of the secondary welding teeth to the diameter of the main welding teeth, the diameter of the secondary welding teeth can be restricted to a predetermined range, which helps increase the deformation margin of the tab, provides more deformation space for the tab, effectively reduces the pulling force on the tab, and further reduces the probability of tab cracking during welding.

[0012] In some embodiments, the number of auxiliary welding teeth per main welding tooth is 1 to 8. By limiting the number of auxiliary welding teeth per main welding tooth, the distribution of the auxiliary welding teeth can be controlled within a predetermined range, thereby optimizing the deformation margin imparted by the welding head to the tab, further optimizing the pulling force on the tab, and further reducing the probability of tab cracking during welding.

[0013] In some embodiments, at least two auxiliary welding teeth are protruding from the outer surface of each main welding tooth. Each main welding tooth includes a central region and an edge region surrounding the central region. The number of auxiliary welding teeth in the edge region is greater than the number of auxiliary welding teeth in the central region. Thus, when the welding head ultrasonically welds the tab, the edge region of each main welding tooth exerts the most severe pull on the tab. By increasing the number of auxiliary welding teeth in the edge region of each main welding tooth, the pulling force on the tab by the edge region of the main welding tooth can be effectively reduced, increasing the tab deformation margin, and reducing the probability of tab cracking during welding.

[0014] In some embodiments, the welding head includes a mounting end and a welding end disposed opposite each other, the welding end having a working end surface, and a welding zone disposed on the working end surface; the welding zone has two first edges disposed opposite each other along a second direction, and the working end surface has two second edges disposed opposite each other along the second direction, where the second direction is the length direction of the welding head; and the spacing between any first edge and its corresponding second edge in the second direction is 0.5 mm to 0.7 mm. This provides sufficient spacing between the welding zone of the welding head and the edges of the welding head in the length direction, thereby alleviating the risk of tab cracking caused by stress concentration at the edges of the welding head, and thereby reducing the probability of tab cracking during welding.

[0015] In some embodiments, the welding area has two third edges disposed opposite each other along a first direction, and the working end surface has two fourth edges disposed opposite each other along the first direction. In the first direction, the spacing between any third edge and its corresponding fourth edge is 0.5 mm to 0.7 mm. This provides sufficient spacing between the welding area of ​​the welding head and the edges in the width direction of the welding head, thereby alleviating the risk of tab cracking caused by stress concentration at the edges of the welding head and reducing the probability of tab cracking during welding.

[0016] A welding device includes a mounting frame and the aforementioned welding head, which is fixed to the mounting frame. In the welding head of the aforementioned welding device, all main welding teeth form at least two rows, and the main welding teeth in two adjacent rows are staggered. This can increase the number of main welding teeth within the available space. When using the welding head to ultrasonically weld a tab, not only can the contact area between the welding head and the tab be increased, thereby enhancing the welding effect of the tab, but it can also improve the stress concentration on the side of the tab during ultrasonic welding, thereby reducing the probability of cracking during tab welding and effectively improving the welding quality of the tab.

[0017] A battery production system includes the aforementioned welding device. In the aforementioned battery production system, all main welding teeth in the welding device are arranged in at least two rows, and the main welding teeth in two adjacent rows are staggered. This increases the number of main welding teeth within the available space. When ultrasonically welding a tab using a welding head, this not only increases the contact area between the welding head and the tab, enhancing the tab welding effect, but also reduces stress concentration on the tab side during ultrasonic welding, reducing the probability of tab cracking during welding and effectively improving the tab welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a welding head in some embodiments of the present application.

[0019] Figure 2 for Figure 1 A partial enlarged view of the welding head shown.

[0020] Figure 3 for Figure 1 Top view of the welding head shown without dimensions.

[0021] Figure 4 for Figure 1 Top view of the welding head shown with dimensions indicated.

[0022] Figure 5 for Figure 1 Front view of the welding head shown.

[0023] Reference numerals:

[0024] 100. Main body; 101. Welding area; 101a. First edge; 101b. Third edge; 102. Mounting end; 103. Welding end; 104. Working end face; 104a. Second edge; 104b. Fourth edge; 200. Main welding tooth; 210. Center area; 220. Edge area; 300. Secondary welding tooth. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0027] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0028] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0030] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0031] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0032] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0033] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance, etc. of new energy vehicles are increasingly attracting people's attention and attention. Batteries, as the power energy of new energy vehicles, are widely used.

[0034] Currently, the tab is the core current collector component of a power battery, playing an important role in current transfer and diversion. Typically, the multi-layer tabs of a power battery are first connected to the adapter using an ultrasonic welding head, and then the adapter is connected to the top cover using laser welding, thereby effectively connecting the tab and the top cover. When welding the tab with an ultrasonic welding head, the high vibration and friction of the welding teeth often cause excessive local stress in the tab, causing the tab to deform, resulting in damage or breakage, and a high probability of the tab cracking during welding.

[0035] Based on the above considerations, after in-depth research, the present application has designed a welding head, a welding device and a battery production system. In the welding head, all the main welding teeth form at least two rows, and the main welding teeth of the two adjacent rows are staggered, which can increase the number of main welding teeth in the effective space. When using the welding head to perform ultrasonic welding on the pole tab, it can not only increase the contact area between the welding head and the pole tab and enhance the welding effect of the pole tab, but also improve the stress concentration on the side of the pole tab during ultrasonic welding, which is beneficial to reduce the probability of cracking during welding of the pole tab and effectively improve the welding quality of the pole tab.

[0036] Please refer to Figures 1 to 3 In one embodiment, a welding head is used for welding a tab. The welding head includes a main body 100 and main welding teeth 200. The main body 100 has a welding area 101. The main welding teeth 200 are protruding from the welding area 101. The number of the main welding teeth 200 is at least two, and all the main welding teeth 200 form at least two rows, and the main welding teeth 200 in two adjacent rows are staggered.

[0037] It should be noted that the main welding teeth 200 of two adjacent rows are staggered, which can be understood as: the main welding teeth 200 of two adjacent rows are staggered. Figure 3 The main welding teeth 200 of two adjacent rows are staggered in the Y direction as shown, so that the main welding teeth 200 of two adjacent rows are staggered in the Y direction as shown. Figure 3 There is a certain position offset in the Y direction as shown.

[0038] For example, Figure 3 As shown, the first row has 11 main welding teeth 200, and the second row has 10 main welding teeth 200; compared with the first main welding tooth 200 in the first row, the first main welding tooth 200 in the second row is along Figure 3 The Y direction shown is shifted to the right, so that the first main welding tooth 200 in the first row and the first main welding tooth 200 in the second row do not belong to the same column; compared with the second main welding tooth 200 in the first row, the second main welding tooth 200 in the second row is along Figure 3The Y direction shown is shifted to the right, so that the second main welding tooth 200 in the first row and the second main welding tooth 200 in the second row do not belong to the same column, and so on.

[0039] In the embodiments of the present application, the main body 100 is a component that provides a mounting space for the main welding tooth 200 or other components. The main body 100 can adopt various structural forms. For example, the main body 100 can be a one-piece structure or a composite structure composed of multiple parts. The overall shape of the main body 100 can be a rectangular parallelepiped, cylindrical, or other shape. The structural form of the main body 100 is not specifically limited herein.

[0040] In the embodiments of the present application, the main welding teeth 200 are components that protrude from the welding area 101 of the main body 100 and are used to contact the tab. The main welding teeth 200 can adopt various structural forms. Specifically, the welding area 101 is a planar structure, and the main welding teeth 200 protrude from the surface of the welding area 101. The main welding teeth 200 can be spherical, square, or other shapes. The main welding teeth 200 and the main body 100 can be an integral structure (e.g., integrally molded by casting) or a separate structure (e.g., fixedly connected by welding).

[0041] In the above-mentioned welding head, all the main welding teeth 200 form at least two rows, and the main welding teeth 200 in two adjacent rows are staggered, which can increase the number of main welding teeth 200 in the effective space. When using the welding head to ultrasonically weld the tab, it can not only increase the contact area between the welding head and the tab and enhance the welding effect of the tab, but also improve the stress concentration on the side of the tab during ultrasonic welding, which is beneficial to reduce the probability of cracking during tab welding and effectively improve the welding quality of the tab.

[0042] According to some embodiments of this application, please refer to Figure 3 and Figure 4 , all main welding teeth 200 form at least two rows in the first direction, the first direction being the width direction of the welding head; the main welding teeth 200 in the same row are equally spaced along the second direction, the second direction being the length direction of the welding head; the width of the welding area 101 is b, the diameter of each main welding tooth 200 is d, the spacing between two adjacent main welding teeth 200 in the same row is c, the position offset of the main welding teeth 200 in two adjacent rows in the second direction is B=(d+c) / 2, and the spacing between the main welding teeth 200 in two adjacent rows in the first direction is A=3 1 / 2 / 2*(d+c); wherein the total number of rows of the main welding teeth 200 in the first direction M=(bB) / A+1, and M is rounded down.

[0043] It should be noted that the first direction is Figure 3 In the X direction shown, all the main welding teeth 200 form at least two rows in the first direction, that is, all the main welding teeth 200 are arranged in the Figure 3At least two rows are formed in the X direction. The second direction is Figure 4 The Y direction is the length direction of the welding head. The width b of the welding area 101 is the width of the welding area 101. Figure 4 The size in the X direction shown; the spacing c between two adjacent main welding teeth 200 located in the same row, that is, the two adjacent main welding teeth 200 in Figure 4 The size in the Y direction shown; the position offset B of the two adjacent rows of main welding teeth 200 in the second direction, that is, the position offset B of the two adjacent rows of main welding teeth 200 in the second direction Figure 4 Dimensions in the Y direction are shown.

[0044] For example, in Figure 4 In the illustrated embodiment (i.e., the embodiment in which the main welding teeth 200 in two adjacent rows are staggered), the width b of the welding area 101 is 5 mm, the length a of the welding area 101 is 6 mm, the diameter d of each main welding tooth 200 is 1 mm, the spacing c between two adjacent main welding teeth 200 in the same row is 0.2 mm, the position offset of the main welding teeth 200 in two adjacent rows in the second direction is B=(1+0.2) / 2=0.6 mm, and the spacing A between the main welding teeth 200 in the first direction is 3 mm. 1 / 2 / 2*(1+0.2)=3 1 / 2 *0.6; wherein the total number of rows of the main welding teeth 200 in the first direction is M = (5-0.6) / (3 1 / 2 *0.6) + 1 = 5 (rounded);

[0045] In other embodiments (i.e., embodiments in which all main welding teeth 200 are distributed at equal intervals), the total number of rows of main welding teeth 200 in the first direction is 5 / 1.2=4 (rounded);

[0046] From the above, it can be seen that when the area of ​​the welding zone 101 is equal, in the embodiment where all the main welding teeth 200 are distributed at equal intervals, the total number of rows of main welding teeth 200 is 4, and in the embodiment where the main welding teeth 200 in two adjacent rows are staggered, the total number of rows of main welding teeth 200 is 5. The staggered distribution of the main welding teeth 200 in two adjacent rows can increase the number of main welding teeth 200 in the effective space.

[0047] In the embodiment of the present application, the main welding teeth 200 in two adjacent rows are staggered, and the position offsets B of the main welding teeth 200 in any two adjacent rows in the second direction may be equal or unequal.

[0048] Through the above settings, the main welding teeth 200 located in the same row are distributed at equal intervals along the second direction, and the main welding teeth 200 in two adjacent rows are staggered. Through the above parameter settings, the total number of rows M of the main welding teeth 200 in the first direction can be obtained, and the number of main welding teeth 200 can be increased as much as possible within the effective space, which is beneficial to increase the contact area between the welding head and the tab, so as to enhance the welding effect of the tab.

[0049] According to some embodiments of this application, please refer to Figure 4 , the length of the welding area 101 is a, and the number of main welding teeth 200 in each row is N=a / (d+c); when the total number of rows M of the main welding teeth 200 is an odd number, the total number of main welding teeth 200 is Q=MN+(M-1) / 2; when the total number of rows M of the main welding teeth 200 is an even number, the total number of main welding teeth 200 is Q=MN+M / 2.

[0050] It should be noted that since the main welding teeth 200 located in the same row are distributed at equal intervals along the second direction, the number N of the main welding teeth 200 in each row can be obtained by dividing the length of the welding area 101 by the diameter of each main welding tooth 200 and the sum of the intervals between two adjacent main welding teeth 200 located in the same row.

[0051] For example, in Figure 4 In the illustrated embodiment (i.e., the embodiment in which the main welding teeth 200 in two adjacent rows are staggered), the width b of the welding area 101 is 5 mm, the length a of the welding area 101 is 6 mm, the diameter d of each main welding tooth 200 is 1 mm, the spacing c between two adjacent main welding teeth 200 in the same row is 0.2 mm, the position offset of the main welding teeth 200 in two adjacent rows in the second direction is B=(1+0.2) / 2=0.6 mm, and the spacing A between the main welding teeth 200 in the first direction is 3 mm. 1 / 2 / 2*(1+0.2)=3 1 / 2 *0.6; wherein the total number of rows of the main welding teeth 200 in the first direction is M = (5-0.6) / (3 1 / 2 *0.6) + 1 = 5 (rounded to the nearest integer), the number of main welding teeth 200 in each row N = 6 / (1+0.2) = 5, the total number of rows M of main welding teeth 200 is an odd number, and the total number of main welding teeth 200 Q = 5*5+(5-1) / 2 = 27;

[0052] In other embodiments (i.e., embodiments in which all main welding teeth 200 are distributed at equal intervals), the total number of rows of main welding teeth 200 in the first direction is 5 / 1.2=4 (rounded to the nearest integer), the number of main welding teeth 200 in each row is N=6 / (1+0.2)=5, and the total number of main welding teeth 200 is Q=4*5+(5-1) / 2=20;

[0053] From the above, it can be seen that when the area of ​​the welding zone 101 is equal, in the embodiment where all the main welding teeth 200 are distributed at equal intervals, the total number of the main welding teeth 200 is 27, and in the embodiment where the main welding teeth 200 in two adjacent rows are staggered, the total number of the main welding teeth 200 is 20. The staggered distribution of the main welding teeth 200 in two adjacent rows can increase the number of main welding teeth 200 within the effective space.

[0054] Through the above settings, the total number of main welding teeth 200 can be obtained through the above parameter settings, and the number of main welding teeth 200 can be increased as much as possible within the effective space, which is beneficial to increase the contact area between the welding head and the tab, so as to enhance the welding effect of the tab.

[0055] According to some embodiments of this application, please refer to Figure 5 Each main welding tooth 200 is constructed as a hemispherical structure protruding from the welding area 101.

[0056] It should be noted that when the welding head is used to ultrasonically weld the pole tab, the welding area 101 of the main body 100 is pressed on the pole tab of the electrode unit, and the main welding teeth 200 located in the welding area 101 can contact the pole tab. Since the main welding teeth 200 are hemispherical structures, the protruding top of each main welding tooth 200 will first contact the pole tab.

[0057] In the embodiment of the present application, each main welding tooth 200 is a hemispherical structure protruding from the welding area 101. The hemispherical structure is a solid structure, and the outer contour of the hemispherical structure can be a semi-sphere, a semi-ellipsoid, or other shapes. The diameters of all main welding teeth 200 can be equal or unequal, depending on the actual design requirements.

[0058] Through the above-mentioned setting, each main welding tooth 200 is set as a protruding hemispherical structure. When the pole tab is ultrasonically welded using the welding head, the protruding top of each main welding tooth 200 will first contact the pole tab, which can give the pole tab more deformation space, effectively reduce the pulling force of the pole tab, and reduce the probability of the pole tab cracking during welding.

[0059] According to some embodiments of this application, please refer to Figure 5 The welding head also includes auxiliary welding teeth 300, and at least one auxiliary welding tooth 300 is protruded from the outer surface of any main welding tooth 200.

[0060] It should be noted that when the welding head is used to ultrasonically weld the electrode tab, the main welding teeth 200 of the main body 100 are pressed on the electrode tab of the electrode unit. Since the outer surface of the main welding teeth 200 is protruding with auxiliary welding teeth 300, the auxiliary welding teeth 300 of each main welding tooth 200 will contact the electrode tab, so that the stress can be dispersed along the auxiliary welding teeth 300, thereby reducing the stress concentration of the welding head.

[0061] In the embodiment of the present application, the auxiliary welding teeth 300 are components that protrude from the welding area 101 of the main body 100 and are used to contact the tab. The auxiliary welding teeth 300 can adopt various structural forms. Among them, the welding area 101 is a planar structure, and the main welding teeth 200 are protruding from the surface of the welding area 101. The auxiliary welding teeth 300 are integrally formed with the outer surface of the main welding teeth 200. For example, each auxiliary welding tooth 300 is integrally formed with the outer surface of the main welding tooth 200 by casting or other methods. The integral forming method of each auxiliary welding tooth 300 is not limited here.

[0062] In the embodiment of the present application, at least one auxiliary welding tooth 300 is protruding from the outer surface of any main welding tooth 200. That is, the outer surface of each main welding tooth 200 can be provided with one auxiliary welding tooth 300, or at least two auxiliary welding teeth 300. When at least two auxiliary welding teeth 300 are provided on the outer surface of a main welding tooth 200, the size and shape of all auxiliary welding teeth 300 of the same main welding tooth 200 can be the same or different.

[0063] Through the above-mentioned arrangement, by protruding the auxiliary welding teeth 300 on the outer surface of the main welding teeth 200, when the welding head performs ultrasonic welding on the tab, the contact between the outer surface of the auxiliary welding teeth 300 and the tab can give the tab more deformation space, increase the deformation margin of the tab, give the tab deformation space, effectively reduce the pulling force of the tab, and further reduce the probability of the tab cracking during welding.

[0064] According to some embodiments of this application, please refer to Figure 5 The auxiliary welding tooth 300 is constructed as a spherical structure protruding from the outer surface of the main welding tooth 200.

[0065] In the embodiment of the present application, the auxiliary welding teeth 300 are spherical structures protruding from the main welding teeth 200. The spherical structure is a solid structure, and the outer contour of the spherical structure can be a sphere, an ellipsoid, or other shapes. The diameters of all auxiliary welding teeth 300 can be equal or unequal, depending on the actual design requirements.

[0066] Through the above-mentioned setting, each auxiliary welding tooth 300 is set as a protruding spherical structure. When the pole tab is ultrasonically welded using the welding head, the protruding top of each auxiliary welding tooth 300 will first contact the pole tab, giving the pole tab more deformation space, further effectively reducing the pulling force of the pole tab, and reducing the probability of the pole tab cracking during welding.

[0067] According to some embodiments of this application, please refer to Figure 5 The diameter of the auxiliary welding tooth 300 is h, the diameter of the main welding tooth 200 is d, and 0.2d≤h≤0.5d.

[0068] It can be understood that the larger the diameter h of the auxiliary welding tooth 300 is, the more space the auxiliary welding tooth 300 occupies. When the welding head performs ultrasonic welding on the tab, the auxiliary welding tooth 300 will squeeze the tab space and is not easily subjected to force; the smaller the diameter h of the auxiliary welding tooth 300 is, the smaller the space the auxiliary welding tooth 300 occupies, and the effect of increasing the deformation margin of the tab is not obvious.

[0069] In the embodiment of the present application, the ratio of the diameter h of the auxiliary welding tooth 300 to the diameter d of the main welding tooth 200 may be 0.2, 0.3, 0.4 or 0.5.

[0070] Through the above-mentioned setting, by limiting the ratio of the diameter of the auxiliary welding tooth 300 to the diameter of the main welding tooth 200, the diameter of the auxiliary welding tooth 300 can be limited to a preset range, which is conducive to increasing the deformation margin of the tab, giving the tab more deformation space, and effectively reducing the pulling force of the tab, further reducing the probability of the tab cracking during welding.

[0071] According to some embodiments of this application, please refer to Figure 5 The number of auxiliary welding teeth 300 of any main welding tooth 200 is 1 to 8.

[0072] In the embodiment of the present application, the number of auxiliary welding teeth 300 of any main welding tooth 200 can be 1, 2, 3, 4, 5, 6, 7 or 8.

[0073] Through the above-mentioned setting, by limiting the number of auxiliary welding teeth 300 on each main welding tooth 200, the distribution of the auxiliary welding teeth 300 can be controlled within a preset range, which is conducive to optimizing the deformation margin of the welding head to the tab, further optimizing the pulling force on the tab, and further reducing the probability of the tab cracking during welding.

[0074] According to some embodiments of this application, please refer to Figure 5 At least two auxiliary welding teeth 300 are protruding from the outer surface of any main welding tooth 200. Each main welding tooth 200 includes a central area 210 and an edge area 220 surrounding the central area 210. The number of auxiliary welding teeth 300 in the edge area 220 is greater than the number of auxiliary welding teeth 300 in the central area 210.

[0075] It should be noted that, since the main welding tooth 200 is a hemispherical structure, the central area 210 of the main welding tooth 200 is the middle area distributed around the center of the sphere, and the edge area 220 is the outer area surrounding the outer periphery of the central area 210 .

[0076] For example, each main welding tooth 200 has a total of 8 auxiliary welding teeth 300, wherein 5 auxiliary welding teeth 300 are arranged in the edge area 220 of each main welding tooth 200, and 3 auxiliary welding teeth 300 are arranged in the central area 210.

[0077] Through the above-mentioned arrangement, when the welding head performs ultrasonic welding on the tab, the edge area 220 of each main welding tooth 200 pulls the tab most severely. By increasing the number of auxiliary welding teeth 300 in the edge area 220 of each main welding tooth 200, the pulling force of the edge area 220 of the main welding tooth 200 on the tab can be effectively reduced, the deformation margin of the tab can be increased, and the probability of the tab cracking during welding can be reduced.

[0078] According to some embodiments of this application, please refer to Figure 3 and Figure 4The welding head includes a mounting end 102 and a welding end 103 arranged opposite to each other, the welding end 103 has a working end surface 104, and the welding area 101 is arranged on the working end surface 104; the welding area 101 has two first edges 101a arranged opposite to each other along the second direction, and the working end surface 104 has two second edges 104a arranged opposite to each other along the second direction, where the second direction is the length direction of the welding head; in the second direction, the distance between any first edge 101a and a corresponding second edge 104a is 0.5 mm to 0.7 mm.

[0079] It should be noted that the welding end 103 of the welding head refers to an end of the main body 100 for contacting and welding the tab, and the mounting end 102 refers to the other end of the main body 100 away from the welding end 103 .

[0080] In the embodiment of the present application, in the second direction, the distance between any first edge 101 a and a corresponding second edge 104 a may be 0.5 mm, 0.6 mm, or 0.7 mm.

[0081] Through the above arrangement, there is sufficient spacing between the welding area 101 of the welding head and the edge in the longitudinal direction of the welding head, which can improve the situation where the edge stress concentration of the welding head causes the tab to crack, and is conducive to reducing the probability of the tab cracking during welding.

[0082] According to some embodiments of this application, please refer to Figure 3 and Figure 4 The welding area 101 has two third edges 101b arranged opposite to each other along the first direction, and the working end surface 104 has two fourth edges 104b arranged opposite to each other along the first direction; in the first direction, the distance between any third edge 101b and a corresponding fourth edge 104b is 0.5mm~0.7mm.

[0083] In the embodiment of the present application, in the first direction, the distance between any third edge 101b and a corresponding fourth edge 104b may be 0.5 mm, 0.6 mm, or 0.7 mm.

[0084] Through the above arrangement, there is sufficient space between the welding area 101 of the welding head and the edge in the width direction of the welding head, which can improve the situation where the edge stress concentration of the welding head causes the tab to crack, and is conducive to reducing the probability of the tab cracking during welding.

[0085] Please refer to Figure 1 In one embodiment, the welding device includes a mounting frame and the welding head mentioned above, and the welding head is fixed on the mounting frame.

[0086] It should be noted that, in addition to the above-mentioned welding head, the welding device also includes components such as a mobile platform. The mobile platform is connected to the mounting frame. The mobile platform can drive the mounting frame to move, thereby driving the welding head to move to change the position of the welding head.

[0087] In the above-mentioned welding device, in the welding head, all the main welding teeth 200 form at least two rows, and the main welding teeth 200 in two adjacent rows are staggered, which can increase the number of main welding teeth 200 in the effective space. When using the welding head to ultrasonically weld the tab, it can not only increase the contact area between the welding head and the tab and enhance the welding effect of the tab, but also improve the stress concentration on the side of the tab during ultrasonic welding, which is beneficial to reduce the probability of cracking during tab welding and effectively improve the welding quality of the tab.

[0088] Please refer to Figure 1 , a battery production system in one embodiment includes the above-mentioned welding device.

[0089] It should be noted that, in addition to the aforementioned welding device, the battery production system also includes an assembly device, which is located downstream of the welding device and is used to further process the battery cells.

[0090] In the above-mentioned battery production system, in the welding device, all the main welding teeth 200 form at least two rows, and the main welding teeth 200 in two adjacent rows are staggered, which can increase the number of main welding teeth 200 in the effective space. When using the welding head to ultrasonically weld the pole tab, it can not only increase the contact area between the welding head and the pole tab and enhance the welding effect of the pole tab, but also improve the stress concentration on the side of the pole tab during ultrasonic welding, which is beneficial to reduce the probability of cracking during the welding of the pole tab and effectively improve the welding quality of the pole tab.

[0091] According to some embodiments of this application, see Figures 1 to 5 A welding head for welding tabs, comprising a main body 100, main welding teeth 200 and auxiliary welding teeth 300. The main body 100 has a welding area 101, the main welding teeth 200 are protruding from the welding area 101, and at least one auxiliary welding tooth 300 is protruding from the outer surface of any main welding tooth 200; wherein, the number of main welding teeth 200 is at least two, and all the main welding teeth 200 form at least two rows in the first direction, and the main welding teeth 200 in two adjacent rows are staggered. The main welding teeth 200 in the same row are equally spaced along the second direction, which is the length direction of the welding head; the width of the welding area 101 is b, the length of the welding area 101 is a, the diameter of each main welding tooth 200 is d, the spacing between two adjacent main welding teeth 200 in the same row is c, the position offset of the main welding teeth 200 in two adjacent rows in the second direction is B=(d+c) / 2, and the spacing between the main welding teeth 200 in two adjacent rows in the first direction is A=3 1 / 2 / 2*(d+c); wherein, the total number of rows of the main welding teeth 200 in the first direction M=(bB) / A+1, and M is rounded down; the number of main welding teeth 200 in each row N=a / (d+c); when the total number of rows of the main welding teeth 200 M is an odd number, the total number of the main welding teeth 200 Q=MN+(M-1) / 2; when the total number of rows of the main welding teeth 200 M is an even number, the total number of the main welding teeth 200 Q=MN+M / 2.

[0092] Among them, each main welding tooth 200 is constructed as a hemispherical structure protruding from the welding area 101, and the auxiliary welding tooth 300 is constructed as a spherical structure protruding from the outer surface of the main welding tooth 200. The diameter of the auxiliary welding tooth 300 is h, and the diameter of the main welding tooth 200 is d, 0.2d≤h≤0.5d, and the number of auxiliary welding teeth 300 of any main welding tooth 200 is 1 to 8.

[0093] According to some embodiments of this application, see Figure 1 , a welding device in one embodiment includes the above-mentioned welding head.

[0094] According to some embodiments of this application, see Figure 1 , a battery production system in one embodiment includes the above-mentioned welding device.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A welding head for welding a tab, characterized in that: The welding head comprises: a main body having a welding area; Main welding teeth, convexly arranged on the welding area; There are at least two main welding teeth, all of which form at least two rows, and the main welding teeth in two adjacent rows are staggered.

2. The welding head according to claim 1, characterized in that All the main welding teeth form at least two rows in a first direction, the first direction being the width direction of the welding head; the main welding teeth in the same row are equally spaced along a second direction, the second direction being the length direction of the welding head; The width of the welding area is b, the diameter of each main welding tooth is d, the distance between two adjacent main welding teeth in the same row is c, the position offset of the main welding teeth in two adjacent rows in the second direction is B=(d+c) / 2, and the distance between the main welding teeth in two adjacent rows in the first direction is A=3 1 / 2 / 2*(d+c); The total number of rows of the main welding teeth in the first direction is M=(bB) / A+1, where M is rounded down.

3. The welding head according to claim 2, characterized in that The length of the welding zone is a, and the number of the main welding teeth in each row is N=a / (d+c); When the total number of rows M of the main welding teeth is an odd number, the total number of the main welding teeth Q=MN+(M-1) / 2; When the total number of rows M of the main welding teeth is an even number, the total number of the main welding teeth Q=MN+M / 2.

4. The welding head according to claim 1, characterized in that Each of the main welding teeth is constructed as a hemispherical structure protruding from the welding area.

5. The welding head according to claim 1, characterized in that The welding head further comprises auxiliary welding teeth, and at least one auxiliary welding tooth is protruded from the outer surface of any one of the main welding teeth.

6. The welding head according to claim 5, characterized in that The auxiliary welding tooth is constructed as a spherical structure protruding from the outer surface of the main welding tooth.

7. The welding head according to claim 5, characterized in that The diameter of the auxiliary welding tooth is h, the diameter of the main welding tooth is d, and 0.2d ≤ h ≤ 0.5d.

8. The welding head according to claim 5, characterized in that The number of the auxiliary welding teeth of any one of the main welding teeth is 1 to 8.

9. The welding head according to claim 5, characterized in that: At least two auxiliary welding teeth are protruding from the outer surface of any main welding tooth, and each main welding tooth includes a central area and an edge area surrounding the central area, and the number of the auxiliary welding teeth in the edge area is greater than the number of the auxiliary welding teeth in the central area.

10. The welding head according to claim 2, characterized in that: The welding head comprises a mounting end and a welding end which are arranged opposite to each other, the welding end has a working end surface, and the welding area is arranged on the working end surface; The welding area has two first edges arranged opposite to each other along a second direction, and the working end surface has two second edges arranged opposite to each other along the second direction, wherein the second direction is the length direction of the welding head; In the second direction, a distance between any first edge and a corresponding second edge is 0.5 mm to 0.7 mm.

11. The welding head according to claim 10, characterized in that: The welding area has two third edges arranged opposite to each other along the first direction, and the working end surface has two fourth edges arranged opposite to each other along the first direction; In the first direction, a distance between any one of the third edges and a corresponding one of the fourth edges is 0.5 mm to 0.7 mm.

12. A welding device, characterized in that: It comprises a mounting frame and a welding head as described in any one of claims 1 to 11, wherein the welding head is fixed on the mounting frame.

13. A battery production system, characterized in that: Comprising the welding device as claimed in claim 12.

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