Battery and ultrasonic welding head

Abstract

The utility model relates to the field of battery manufacturing, in particular to a battery and an ultrasonic welding head. The battery comprises a tab; a first welding printing groove and a second welding printing groove are formed in the welded surface of the tab; the number of the first welding printing grooves is multiple, and the multiple first welding printing grooves are arranged on the welded face in an array mode. A preset number of adjacent first welding printing grooves are formed in the circumferential direction of the second welding printing groove in a surrounding manner; and the depth of the second welding printing groove is smaller than that of the first welding printing groove. According to the battery provided by the invention, the tab region between the large welding teeth is subjected to welding pressure action along the vertical direction through the small welding teeth, so that the first welding print groove and the second welding print groove are correspondingly formed in the tabs, and the longitudinal size difference of the uppermost tab in the welding print is reduced; therefore, the problems of poor welding, poor fusion effect, welding tearing, welding cracking and the like of the tabs are solved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing, and in particular to a battery and an ultrasonic welding head. Background Art

[0002] During the assembly process of lithium battery cells, an ultrasonic welder is used to weld the tabs and adapters together. As the capacity and safety performance of lithium batteries continue to increase, the number of cell layers and tab layers also increase accordingly. After the number of tab layers increases, the tabs are prone to cold welding, which in turn causes the tab welding strength and welding effect to fail to meet the requirements. Utility Model Content

[0003] The purpose of the present application is to provide a battery and an ultrasonic welding head for improving problems such as poor tab welding, poor fusion effect, welding tearing and welding cracking.

[0004] The present application provides a battery, including a tab;

[0005] The welding surface of the electrode tab is formed with a first welding mark groove and a second welding mark groove;

[0006] The number of the first welding grooves is multiple, and the multiple first welding grooves are arranged in an array on the welding surface;

[0007] A preset number of adjacent first weld imprint grooves are arranged around the circumference of the second weld imprint groove; the groove depth of the second weld imprint groove is smaller than the groove depth of the first weld imprint groove.

[0008] In the above technical solution, further, the plurality of first weld imprint grooves are arranged in a rectangular array, and the lateral spacing and the longitudinal spacing between the first weld imprint grooves are equal;

[0009] The four adjacent first welding imprint grooves are arranged to form a square area.

[0010] In the above technical solution, further, in the direction from the groove bottom to the groove opening of the first weld mark groove, the cross section of the first weld mark groove gradually expands;

[0011] In a direction from the groove bottom to the groove opening of the second weld mark groove, the cross section of the second weld mark groove gradually expands.

[0012] In the above technical solution, further, the first welding mark groove is in a truncated cone shape;

[0013] The second welding mark groove is in a truncated cone shape.

[0014] The present application also provides an ultrasonic welding head, comprising a first welding part;

[0015] The first welding portion is provided with a plurality of first welding teeth, and the plurality of first welding teeth include main welding teeth and auxiliary welding teeth;

[0016] The number of the main welding teeth is multiple, and the multiple main welding teeth are arranged in an array;

[0017] A preset number of adjacent main welding teeth are arranged around the auxiliary welding teeth; the height of the auxiliary welding teeth is smaller than the height of the main welding teeth.

[0018] In the above technical solution, further, the plurality of main welding teeth are arranged in a rectangular array, and the lateral spacing and the longitudinal spacing between the main welding teeth are equal;

[0019] The four adjacent main welding teeth are arranged to form a square welding area.

[0020] In the above technical solution, further, the cross section of the main welding tooth gradually expands from the end to the root of the main welding tooth;

[0021] The cross section of the auxiliary welding tooth gradually expands from the end to the root of the auxiliary welding tooth.

[0022] In the above technical solution, further, the main welding tooth is in a truncated cone shape;

[0023] The auxiliary welding tooth is in the shape of a welding tooth frustum.

[0024] In the above technical solution, further, the first welding portion is also provided with a second welding tooth;

[0025] The second welding teeth are arranged around the circumference of the plurality of the first welding teeth; the height of the second welding teeth is lower than the height of the main welding teeth;

[0026] The second welding teeth are flat teeth.

[0027] In the above technical solution, further, the height difference between the second welding tooth and the main welding tooth is half the thickness of the electrode tab to be welded.

[0028] In the above technical solution, further, it also includes a second welding part;

[0029] The second welding portion is arranged around the circumference of the first welding portion. The second welding portion is provided with a third welding tooth. The third welding tooth is a flat tooth. The third welding tooth has the same height as the second welding tooth.

[0030] In the above technical solution, further, a dust removal gap is provided between the second welding part and the first welding part;

[0031] The first welding portion is provided with a communication pipe, one end of the communication pipe is communicated with the dust removal gap, and the other end of the communication pipe is connected to the negative pressure device.

[0032] Compared with the prior art, the beneficial effects of this application are:

[0033] The battery provided in the present application uses small welding teeth to weld and press the pole ear area between large welding teeth in the vertical direction to form a first weld mark groove and a second weld mark groove on the pole ear correspondingly, thereby reducing the longitudinal size difference of the uppermost pole ear in the weld mark, thereby improving the problems of poor welding of the pole ear, poor fusion effect, welding tearing and welding cracking.

[0034] The present application also provides an ultrasonic welding head, which uses small welding teeth to weld and press the pole ear area between large welding teeth in the vertical direction to form a first weld mark groove and a second weld mark groove on the pole ear accordingly, thereby reducing the longitudinal size difference of the uppermost pole ear in the weld mark, thereby improving problems such as poor welding of the pole ear, poor fusion effect, welding tearing and welding cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 A schematic diagram of the welding structure of the tab provided in this application;

[0037] Figure 2 A first structural schematic diagram of the ultrasonic welding head provided in this application;

[0038] Figure 3 A second structural schematic diagram of the ultrasonic welding head provided in this application;

[0039] Figure 4 A third structural schematic diagram of the ultrasonic welding head provided in this application;

[0040] Figure 5 This is a schematic diagram of the structure of the connecting pipe of the ultrasonic welding head provided in this application.

[0041] In the figure: 101-ear; 102-first weld mark groove; 103-second weld mark groove; 104-first welding part; 105-main welding tooth; 106-secondary welding tooth; 107-second welding tooth; 108-second welding part; 109-dust removal gap; 110-connecting pipe; 111-third welding tooth. DETAILED DESCRIPTION

[0042] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0043] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] Embodiment 1

[0046] See also Figure 1 As shown, the battery provided in the present application includes a tab 101, which is formed by stacking a plurality of tab single sheets, and a welding head welds the plurality of tab single sheets from one side of the tab 101, so that the plurality of tab single sheets are connected as one. A first welding mark groove 102 and a second welding mark groove 103 are formed on the welding surface of the tab 101 (the side of the tab single sheet closest to the welding head facing the welding head); the number of the first welding mark grooves 102 is multiple, and the plurality of first welding mark grooves 102 are arranged in an array on the welding surface; a preset number of adjacent first welding mark grooves 102 are arranged around the circumference of the second welding mark groove 103; the groove depth of the second welding mark groove 103 is less than the groove depth of the first welding mark groove 102.

[0047] Specifically, during the manufacturing process of the battery, in the initial state, each layer of the tab sheets is separated and not connected to each other. The tab 101 and the adapter are also separated and not connected. During manufacturing, the multiple layers of tab sheets can be stacked and fitted together, and the tab sheet closest to the adapter sheet is fitted to the adapter sheet. Then a welding head is used to press against the surface of the tab sheet farthest from the adapter sheet of the tab 101. Start the welding head, the multiple layers of tab sheets are melted together and fixed together, and the tab sheet closest to the adapter sheet is welded and fixed to the adapter sheet.

[0048] In the above welding process, the side of the tab piece closest to the welding head is the first side of the tab 101, and the tab piece on the first side has the largest deformation during the welding process. The side of the tab piece farthest from the welding head is the second side of the tab 101, and the tab piece farthest from the welding head has the smallest deformation.

[0049] The first side of the tab 101 is welded to form a deformation that is concave in the direction of the adapter, and the shape of the deformation corresponds to the shape of the welding tooth on the welding head. When welding a tab 101 with a large number of layers, the length of the welding tooth needs to be greater than the thickness of the tab 101. However, due to the excessive number of layers of the tab single sheet and the large thickness of the tab 101, the overly thick tab 101 will cause most of the welded area of ​​the upper tab single sheet to contact and weld with the tail of the welding tooth, causing the tab single sheet to receive the weakened amplitude and welding energy, resulting in poor welding and poor fusion effect. At the same time, the excessive longitudinal weld mark change makes the pulling depth of the surface tab 101 too large, causing tearing and welding cracking problems.

[0050] The present application forms a first welding mark groove 102 and a second welding mark groove 103 which are recessed in the direction of the adapter sheet by welding on the first side of the pole tab 101. The welding teeth corresponding to the first welding mark groove 102 are large welding teeth, and the welding teeth corresponding to the second welding mark groove 103 are small welding teeth. The large welding teeth and the small welding teeth are interlaced and matched, and a gradient change of welding depth is presented in the stacking direction of the pole tab 101. In the process of welding the pole tab 101 with a large number of layers, when the large welding teeth are welded to a certain depth, the small welding teeth contact the pole tab 101 and begin to play an auxiliary welding role, and the pole tab 101 area between the large welding teeth is welded and pressed in the vertical direction, thereby reducing the longitudinal size difference of the topmost pole tab 101 in the weld mark, thereby improving the problems of poor welding, poor fusion effect, welding tearing and welding cracking of the pole tab 101.

[0051] In the optional solution of this embodiment, Figure 1 As shown, a plurality of first weld stamp grooves 102 are arranged in a rectangular array, and the lateral spacing and the longitudinal spacing between the first weld stamp grooves 102 are equal; any four adjacent first weld stamp grooves 102 are arranged to form a square area, and a second weld stamp groove 103 is formed at the center of each square area.

[0052] In this embodiment, four large welding teeth surround a small welding tooth as a unit, wherein the four large welding teeth can melt through the welding portion of the pole ear 101 to form a first weld mark groove 102 with a relatively deep groove; when welding the pole ear 101 with a larger thickness, the middle small welding tooth can play a role of compensating welding, thereby forming a second weld mark groove 103 with a relatively shallow groove depth.

[0053] Optionally, in actual production, three, five, six or other large welding teeth may be provided according to actual conditions, and the plurality of large welding teeth may be arranged to form a regular polygon structure, and the small welding teeth may be provided at the center of the regular polygon structure. Correspondingly, the first welding mark groove 102 and the second welding mark groove 103 corresponding to the arrangement form are formed on the tab 101.

[0054] In an optional solution of this embodiment, the cross section of the first weld mark groove 102 gradually expands from the groove bottom to the groove opening of the first weld mark groove 102; the cross section of the second weld mark groove 103 gradually expands from the groove bottom to the groove opening of the second weld mark groove 103. Optionally, the first weld mark groove 102 is in a truncated cone shape; the second weld mark groove 103 is in a truncated cone shape.

[0055] In this embodiment, on the cross section of the tab 101 in the stacking direction, the first weld mark groove 102 and the second weld mark groove 103 are shaped as gradually smaller inverted trapezoidal grooves, and the inverted trapezoidal groove-shaped weld marks corresponding to the large weld teeth and the inverted trapezoidal groove-shaped weld marks corresponding to the small weld teeth are alternately arranged to connect the multi-layer tabs together. When welding the tab 101 with a thicker foil, the penetration depth is also similar to the height of the weld teeth and is stepped, the penetration depth of the large weld teeth is less than 1.56 mm, and the penetration depth of the small weld teeth is less than 1.3 mm.

[0056] In actual production, the shapes of the large welding teeth and the small welding teeth can be set to conical teeth, circular teeth or a mixture of large and small teeth, trapezoidal teeth, hemispherical teeth, truncated cone teeth or a truncated cone base plus hemispherical teeth on the top according to actual conditions. Correspondingly, a first welding print groove 102 and a second welding print groove 103 corresponding to the shape are formed on the pole ear 101.

[0057] Embodiment 2

[0058] See also Figures 2 to 5 As shown, embodiment 2 of the present application provides an ultrasonic welding head, including a first welding part 104; the first welding part 104 is provided with a plurality of first welding teeth, and the plurality of first welding teeth include a main welding tooth 105 and an auxiliary welding tooth 106; the number of the main welding teeth 105 is multiple, and the plurality of main welding teeth 105 are arranged in an array; a preset number of adjacent main welding teeth 105 are arranged around the auxiliary welding teeth 106; the height of the auxiliary welding teeth 106 is less than the height of the main welding teeth 105.

[0059] Specifically, during the manufacturing process of the battery, in the initial state, each layer of the tab sheets is separated and not connected to each other. The tab 101 and the adapter are also separated and not connected. During manufacturing, the multiple layers of tab sheets can be stacked and bonded to each other, and the tab sheet closest to the adapter sheet is bonded to the adapter sheet. Then the ultrasonic welding head is placed against the surface of the tab sheet farthest from the adapter sheet. The ultrasonic welding head is started to melt and connect the multiple layers of tab sheets together, and the tab sheet closest to the adapter sheet can be welded and fixed to the adapter sheet.

[0060] In the above welding process, the side of the tab sheet closest to the ultrasonic welding head is the first side of the tab 101, and the tab sheet on the first side has the largest deformation during the welding process. The side of the tab sheet farthest from the ultrasonic welding head is the second side of the tab 101, and the tab sheet farthest from the ultrasonic welding head has the smallest deformation.

[0061] The first side of the pole tab 101 is welded to form a deformation that is concave in the direction of the adapter, and the shape of the deformation corresponds to the shape of the welding teeth on the ultrasonic welding head. When welding a pole tab 101 with a large number of layers, the length of the welding teeth needs to be greater than the thickness of the pole tab 101. However, due to the excessive number of layers of the pole tab single sheet and the large thickness of the pole tab 101, the overly thick pole tab 101 will cause most of the welded area of ​​the upper pole tab single sheet to contact and weld with the tail of the welding teeth, causing the pole tab single sheet to receive the weakened amplitude and welding energy, resulting in poor welding and poor fusion effect. At the same time, the excessive longitudinal weld mark change makes the pulling depth of the surface pole tab 101 too large, causing tearing and welding cracking problems.

[0062] The ultrasonic welding head of the present application is provided with a main welding tooth 105 and an auxiliary welding tooth 106. The main welding tooth 105 is a large welding tooth, which can be welded on the first side of the pole lug 101 to form a first welding mark groove 102; the auxiliary welding tooth 106 is a small welding tooth, which can be welded on the first side of the pole lug 101 to form a second welding mark groove 103. The large welding teeth and the small welding teeth are interlaced and matched, and a gradient change of welding depth is presented in the stacking direction of the pole lug 101. In the process of welding the pole lug 101 with a large number of layers, when the large welding teeth are welded to a certain depth, the small welding teeth contact the pole lug 101 and begin to play an auxiliary welding role, and the pole lug 101 area between the large welding teeth is welded and pressed in the vertical direction, reducing the longitudinal size difference of the uppermost pole lug 101 in the weld mark, thereby improving the poor welding and poor fusion effect of the upper pole lug 101, and repairing the welding tear and welding crack.

[0063] It should be noted that when the ultrasonic welding head is welding different foils, the height of the welding teeth is different, and the groove depths of the first welding groove 102 and the second welding groove 103 are also different. When welding the copper foil tab 101, since the copper foil is thin, the height difference between the two welding teeth is also small to ensure the participation of the auxiliary welding teeth 106. According to the thickness of the foil, the height difference between the main welding teeth 105 and the auxiliary welding teeth 106 is between 0.05mm and 0.15mm. Specifically, the height difference between the main welding teeth 105 and the auxiliary welding teeth 106 can be 0.05mm, 0.1mm or 0.15mm. When welding the tab 101 of aluminum foil, the height difference between the main welding teeth 105 and the auxiliary welding teeth 106 is between 0.2 mm and 0.4 mm. Specifically, the height difference between the main welding teeth 105 and the auxiliary welding teeth 106 can be 0.2 mm, 0.3 mm or 0.4 mm. By designing the height dimensions of the two welding teeth in this way, it can be ensured that the welding marks of the main welding teeth 105 and the auxiliary welding teeth 106 do not overlap during welding, and there is no need to consider the gap between the welding marks of the two welding teeth. In this way, the tab 101 with a thickness range of less than 1.6 mm can be welded using the ultrasonic welding head.

[0064] In an optional scheme of this embodiment, multiple main welding teeth 105 are arranged in a rectangular array, and the lateral spacing and longitudinal spacing between the main welding teeth 105 are equal; four adjacent main welding teeth 105 are arranged to form a square welding area, and an auxiliary welding tooth 106 is arranged in the center of each square welding area.

[0065] In this embodiment, the number of main welding teeth 105 and auxiliary welding teeth 106 is set in accordance with the principle of 1 to 4, and the position distribution follows the principle of square arrangement, that is, one auxiliary welding tooth 106 is set at the center of the square welding area, and four main welding teeth 105 are at the four end positions of the square. That is, four main welding teeth 105 (large welding teeth) surround one auxiliary welding tooth 106 (small welding tooth) as a unit, wherein the four main welding teeth 105 can melt through the welding area of ​​the tab 101 and form a first welding mark groove 102 with a relatively deep groove; when welding the tab 101 with a larger thickness, the middle auxiliary welding tooth 106 can play a role in compensating welding, thereby forming a second welding mark groove 103 with a relatively shallow groove depth. The height of the auxiliary welding tooth 106 is lower than that of the main welding tooth 105, and plays a role in enhancing the welding strength when welding a multi-layer tab single piece.

[0066] Optionally, in actual production, three, five, six or other large welding teeth may be provided according to actual conditions, and a plurality of large welding teeth may be arranged to form a regular polygon structure, and the small welding teeth may be arranged at the center of the regular polygon structure.

[0067] In an optional solution of this embodiment, the cross section of the main welding tooth 105 gradually expands from the end to the root of the main welding tooth 105; the cross section of the auxiliary welding tooth 106 gradually expands from the end to the root of the auxiliary welding tooth 106. Optionally, the main welding tooth 105 is truncated cone-shaped; the auxiliary welding tooth 106 is truncated cone-shaped.

[0068] In this embodiment, the main welding teeth 105 are truncated cone-shaped, and the auxiliary welding teeth 106 are truncated cone-shaped. After welding the pole tab 101, a truncated cone-shaped first welding mark groove 102 and a second welding mark groove 103 can be formed on the pole tab 101. Specifically, in the cross section of the pole tab 101 in the stacking direction, the first welding mark groove 102 and the second welding mark groove 103 are shaped as gradually smaller inverted trapezoidal grooves, and the inverted trapezoidal groove-shaped weld marks corresponding to the main welding teeth 105 and the inverted trapezoidal groove-shaped weld marks corresponding to the auxiliary welding teeth 106 are alternately arranged to connect the multi-layer pole tabs together. When welding the pole tab 101 with a larger foil thickness, the penetration depth is also similar to the height size of the welding teeth and is stepped. The penetration depth of the main welding teeth 105 is less than 1.56 mm, and the penetration depth of the auxiliary welding teeth 106 is less than 1.3 mm.

[0069] It should be noted that the tooth shapes of the main welding teeth 105 and the auxiliary welding teeth 106 can also be designed as conical teeth, circular teeth or a mixture of large and small teeth, trapezoidal teeth, hemispherical teeth, truncated cone teeth or a truncated cone base plus a hemispherical top tooth, etc. according to needs.

[0070] In an optional solution of this embodiment, the first welding portion 104 is further provided with a second welding tooth 107; the second welding tooth 107 is arranged around the circumference of the plurality of first welding teeth; the height of the second welding tooth 107 is lower than the height of the main welding tooth 105; the second welding tooth 107 is a flat tooth. Optionally, the height difference between the second welding tooth 107 and the main welding tooth 105 is half the thickness of the electrode tab 101 to be welded.

[0071] In this embodiment, the second welding teeth 107 are annular flat welding teeth, and surround the circumference of the plurality of first welding teeth. The second welding teeth 107 are lower in height than the main welding teeth 105, and are close in height to the auxiliary welding teeth 106 and are welded in cooperation, which can stabilize the welding state of the main welding teeth 105 and the auxiliary welding teeth 106 on the tab 101, play a role in reducing the welding cracks of the tab 101, and play a role in pressing the outer periphery of the tab 101 during the welding process, and control the extension range of the welding cracks of the tab 101.

[0072] Embodiment 3

[0073] The ultrasonic welding head in the third embodiment is an improvement on the above embodiment, and the technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in the third embodiment.

[0074] In an optional solution of this embodiment, the ultrasonic welding head also includes a second welding part 108; the second welding part 108 is arranged around the circumference of the first welding part 104, and the second welding part 108 is provided with a third welding tooth 111, the third welding tooth 111 is a flat tooth, and the third welding tooth 111 is at the same height as the second welding tooth 107.

[0075] In this embodiment, the third welding teeth 111 are external welding teeth surrounding the first welding portion 104, and have the same height as the internal second welding teeth 107. The thickness of the third welding teeth 111 can be directly adjusted according to the welding area of ​​the tab 101. During the welding process, the third welding teeth 111 play a role in pressing the area outside the welding area of ​​the tab 101, reducing welding cracks, crack extension, and preventing welding joints from sticking.

[0076] In an optional solution of this embodiment, a dust removal gap 109 is arranged between the second welding part 108 and the first welding part 104; a connecting pipe 110 is opened in the first welding part 104, one end of the connecting pipe 110 is connected to the dust removal gap 109, and the other end of the connecting pipe 110 is connected to the negative pressure device.

[0077] In this embodiment, the dust removal gap 109 is connected to the negative pressure device, and the air duct for welding dust removal and the air duct for circulating heat dissipation are combined with each other to increase the contact area between the welding head and the circulating dust removal air, thereby achieving enhanced heat dissipation of the welding part of the welding head, improving the welding head welding sticking to the pole ear 101, increasing the life of the welding head, increasing the welding efficiency, and increasing the number of welding layers of the pole ear 101 matched by the welding head. The circulating air of the negative pressure dust removal directly acts on the inside of the welding head, enhancing the dust removal effect on the spatter generated by welding, and cooperating with the external third welding tooth 111 to control the range of welding spatter, so as to achieve the purpose of improving the production yield of the battery cell. At the same time, the number of the internal negative pressure dust removal connecting pipes 110 can be increased or decreased as needed, and the internal connecting pipes 110 can also be increased with a one-way valve to control the fall of foreign matter.

[0078] Furthermore, according to the need for dust removal effect, the size of the welding area, and the actual welding effect of the welding process, the external third welding tooth 111 can be modified, and other energy-absorbing or flexible materials with good sealing properties can be coated or tightened on the surface, or replaced, so that before welding, a low vacuum effect is formed in the super-welding area in combination with the internal negative pressure, thereby increasing the improvement of welding quality and enhancing the dust removal effect inside the welding; with the energy-absorbing material, the vibration of the pole ear 101 during the welding process can be controlled within the welding area corresponding to the welding head, thereby reducing the welding cracks of the pole ear 101 caused by vibration and controlling the extension of the welding cracks on the pole ear 101.

[0079] 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 is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In addition, a person skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present application and forming different embodiments.

Claims

1. A battery, characterized in that: Including a tab (101); The welding surface of the electrode tab (101) is formed with a first welding mark groove (102) and a second welding mark groove (103); The number of the first welding imprint grooves (102) is multiple, and the multiple first welding imprint grooves (102) are arranged in an array on the welded surface; A preset number of adjacent first weld imprint grooves (102) are arranged around the circumference of the second weld imprint groove (103); the groove depth of the second weld imprint groove (103) is smaller than the groove depth of the first weld imprint groove (102).

2. The battery according to claim 1, characterized in that The plurality of first welding imprint grooves (102) are arranged in a rectangular array, and the lateral spacing and the longitudinal spacing between the first welding imprint grooves (102) are equal; The four adjacent first welding imprint grooves (102) are arranged to form a square area.

3. The battery according to claim 1, characterized in that From the bottom of the first weld imprint groove (102) to the groove opening, the cross section of the first weld imprint groove (102) gradually expands; In a direction from the groove bottom to the groove opening of the second weld imprint groove (103), the cross section of the second weld imprint groove (103) gradually expands.

4. The battery according to claim 3, characterized in that The first welding groove (102) is in the shape of a truncated cone; The second welding mark groove (103) is in the shape of a truncated cone.

5. An ultrasonic welding head, characterized in that: comprising a first welding portion (104); The first welding portion (104) is provided with a plurality of first welding teeth, and the plurality of first welding teeth include main welding teeth (105) and auxiliary welding teeth (106); The number of the main welding teeth (105) is multiple, and the multiple main welding teeth (105) are arranged in an array; A preset number of adjacent main welding teeth (105) are arranged around the auxiliary welding teeth (106); the height of the auxiliary welding teeth (106) is smaller than the height of the main welding teeth (105).

6. The ultrasonic welding head according to claim 5, characterized in that: The plurality of main welding teeth (105) are arranged in a rectangular array, and the transverse spacing and the longitudinal spacing between the main welding teeth (105) are equal; The four adjacent main welding teeth (105) surround and form a square welding area.

7. The ultrasonic welding head according to claim 5, characterized in that: From the end to the root of the main welding tooth (105), the cross section of the main welding tooth (105) gradually expands; The cross section of the auxiliary welding tooth (106) gradually expands from the end to the root of the auxiliary welding tooth (106).

8. The ultrasonic welding head according to claim 7, characterized in that: The main welding tooth (105) is in a truncated cone shape; The auxiliary welding tooth (106) is in the shape of a welding tooth truncated cone.

9. The ultrasonic welding head according to claim 5, characterized in that: The first welding portion (104) is further provided with a second welding tooth (107); The second welding teeth (107) are arranged around the circumference of the plurality of first welding teeth; the height of the second welding teeth (107) is lower than the height of the main welding teeth (105); The second welding teeth (107) are flat teeth.

10. The ultrasonic welding head according to claim 9, characterized in that: The height difference between the second welding tooth (107) and the main welding tooth (105) is half the thickness of the electrode tab (101) being welded.

11. The ultrasonic welding head according to claim 9, characterized in that: Also comprising a second welding portion (108); The second welding portion (108) is arranged around the first welding portion (104), and the second welding portion (108) is provided with a third welding tooth (111). The third welding tooth (111) is a flat tooth, and the third welding tooth (111) is at the same height as the second welding tooth (107).

12. The ultrasonic welding head according to claim 11, characterized in that: A dust removal gap (109) is provided between the second welding portion (108) and the first welding portion (104); The first welding portion (104) is provided with a communication pipe (110), one end of the communication pipe (110) is connected to the dust removal gap (109), and the other end of the communication pipe (110) is connected to a negative pressure device.

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