Battery monomer and ultrasonic welding head structure

Abstract

The utility model relates to a single battery and an ultrasonic welding head structure. The single battery comprises a battery cell body, the tab is connected with the battery cell body, and the tab comprises a first area and a second area; the second area comprises a transition area and a welding mark pit area, and the transition area is located between the welding mark pit area and the first area; the welding mark pit area comprises a plurality of first concave parts and at least one second concave part, the plurality of first concave parts are arranged on at least two opposite edges on the welding mark pit area at intervals, and the plurality of first concave parts are arranged along a first direction of the welding mark pit area at intervals to form a first concave row and a second concave row. According to the ultrasonic welding head structure, better welding quality can be achieved, better welding precision can be achieved, in the welding process, the tabs can be effectively prevented from being penetrated by welding, the welding head structure is prevented from cracking, the welding quality is improved, and the service life of the ultrasonic welding head structure is prolonged. And therefore, the production efficiency and the production yield of the welding assembly line body are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is a kind of battery monomer and ultrasonic welding head structure. BACKGROUND

[0002] Ultrasonic welding is mainly through the high frequency mechanical vibration to the welding of two metal workpieces, usually one metal workpiece is relatively fixed, another metal workpiece is driven by ultrasonic welding equipment and reciprocating friction on its surface at high frequency, while applying certain pressure to the two metal workpieces, so that the workpiece forms a firm combination, to achieve the effect of welding. In the processing of battery monomer, the tab of battery monomer and adapter piece are welded and fixed by ultrasonic welding.

[0003] However, the deficiency of prior art is that the tab of battery monomer and adapter piece are easily welded in the welding process, which affects the production efficiency and production yield of normal welding assembly line. UTILITY MODEL CONTENT

[0004] Therefore, the utility model wants to overcome the deficiency in the prior art, provide a kind of battery monomer and ultrasonic welding head structure, can prevent tab from being welded in the welding process, and can improve welding production efficiency and welding quality, improve the service life of welding head.

[0005] To solve the above technical problems, the utility model provides a kind of battery monomer, including,

[0006] Battery core body;

[0007] Tab, which is connected with the battery core body, the tab includes first area and second area;The second area includes transition zone and welding mark pit area, the transition zone is located between the welding mark pit area and the first area;The welding mark pit area includes a plurality of first inner recesses and at least one second inner recess, a plurality of the first inner recesses are arranged at least on opposite edges of the welding mark pit area, a plurality of the first inner recesses are arranged in the first direction of the welding mark pit area to form first concave row and second concave row, and the second inner recess is located between the first concave row and the second concave row;The depth of the first inner recess is less than the depth of the second inner recess.

[0008] In an embodiment of the utility model, the welding mark pit area includes a plurality of second inner recesses, a plurality of the second inner recesses are arranged in the first direction to form third concave row, and a plurality of the first inner recesses and a plurality of the second inner recesses are respectively corresponding in the second direction, and the second direction is perpendicular to the first direction.

[0009] In an embodiment of the utility model, the welding mark pit area includes a plurality of second inner recesses, a plurality of the second inner recesses are sequentially arranged along the first direction to form a third concave row, there is a gap between adjacent first inner recesses, a plurality of the second inner recesses and a plurality of the gaps are respectively corresponding one by one along the second direction.

[0010] In an embodiment of the utility model, the first inner recess gap is arranged at the four edges of the welding mark pit area, a plurality of the second inner recesses are arranged in the area surrounded by the plurality of first inner recesses, a third inner recess is arranged between the two adjacent second inner recesses, and the structure of the third inner recess is the same as that of the first inner recess.

[0011] In an embodiment of the utility model, the depth of the first inner recess is a, 0.2 mm≤a≤0.4 mm, and the depth of the second inner recess is a+b, 0.1 mm≤b≤1.5 mm.

[0012] In an embodiment of the utility model, the bottom surface of the first inner recess is a circular arc, and the bottom surface of the second inner recess is a rectangular surface.

[0013] In an embodiment of the utility model, the gap between the two adjacent first inner recesses along the first direction is 0.2-0.4 mm, the gap between the two adjacent first inner recesses along the second direction is 0.1-0.3 mm, and / or the gap between the two adjacent second inner recesses along the first direction is 0.2-0.4 mm, the gap between the two adjacent second inner recesses along the second direction is 0.1-0.3 mm, and / or the gap between the adjacent first inner recess and the second inner recess along the first direction is 0.2-0.4 mm, and the gap between the adjacent first inner recess and the second inner recess along the second direction is 0.2-0.4 mm.

[0014] In an embodiment of the utility model, the side length of the rectangular surface is 0.2-0.5 mm.

[0015] In an embodiment of the utility model, the diameter of the projection of the first inner recess along the thickness direction of the tab is consistent with the side length of the bottom surface of the second inner recess.

[0016] The utility model also provides an ultrasonic welding head structure, which comprises,

[0017] a base;

[0018] The crimping portion comprises a tooth-shaped structure protruding from the surface of the base, the tooth-shaped structure comprises a plurality of first welding teeth and at least one second welding tooth, the plurality of first welding teeth are arranged at intervals on at least two opposite edges of the base, the plurality of first welding teeth are arranged at intervals in a first direction of the base to form a first tooth row and a second tooth row, and the second welding tooth is arranged between the first tooth row and the second tooth row; the height of the first welding tooth is less than the height of the second welding tooth.

[0019] In an embodiment of the utility model, the tooth-shaped structure comprises a plurality of second welding teeth, the plurality of second welding teeth are arranged in sequence in the first direction to form a third tooth row, the plurality of first welding teeth and the plurality of second welding teeth correspond to each other in a second direction, and the second direction is perpendicular to the first direction.

[0020] In an embodiment of the utility model, the tooth-shaped structure comprises a plurality of second welding teeth, the plurality of second welding teeth are arranged in sequence in the first direction to form a third tooth row, there is an interval between adjacent first welding teeth, and the plurality of second welding teeth and the plurality of intervals correspond to each other in a second direction.

[0021] In an embodiment of the utility model, the first welding teeth are arranged at intervals on four edges of the base, the second welding tooth is provided with a plurality of second welding teeth, the plurality of second welding teeth are located in the region surrounded by the plurality of first welding teeth, a third welding tooth is arranged between adjacent two second welding teeth, and the third welding tooth has the same structure as the first welding tooth.

[0022] In an embodiment of the utility model, the height of the first welding tooth is c, 0.2 mm≤c≤0.4 mm, the height of the second welding tooth is c+d, and 0.1 mm≤d≤1.5 mm.

[0023] In an embodiment of the utility model, the surface of the first welding tooth in contact with the tab is a circular arc, and the surface of the second welding tooth in contact with the tab is a rectangular surface.

[0024] In an embodiment of the utility model, the interval between two adjacent first welding teeth in the first direction is 0.2-0.4 mm, the interval between two adjacent first welding teeth in the second direction is 0.1-0.3 mm, the interval between two adjacent second welding teeth in the first direction is 0.2-0.4 mm, the interval between two adjacent second welding teeth in the second direction is 0.1-0.3 mm, the interval between the first welding tooth and the second welding tooth in the first direction is 0.2-0.4 mm, and the interval between the first welding tooth and the second welding tooth in the second direction is 0.2-0.4 mm.

[0025] In one embodiment of the utility model, the edge length of the rectangular face is 0.2-0.5mm.

[0026] In one embodiment of the utility model, the diameter of the first welding tooth along the height direction projection is consistent with the edge length of the second welding tooth bottom face.

[0027] The above technical scheme of the utility model has the following advantages compared with the prior art:

[0028] The battery monomer provided by the utility model has the following advantages: the first inner recess and the at least one second inner recess are formed in the welding mark pit area under the mutual contact of the welding head structure and the tab during the welding process, so that better welding quality is achieved, better welding precision is achieved, the tab is effectively prevented from being welded through, the welding head structure is prevented from cracking, the welding quality is improved, and the service life of the ultrasonic welding head structure is prolonged.

[0029] The ultrasonic welding head structure comprises a base and a crimping portion arranged on the base, the crimping portion comprises a tooth-shaped structure arranged protruding along the surface of the base, the tooth-shaped structure comprises a plurality of first welding teeth and at least one second welding tooth, the plurality of first welding teeth are arranged in gaps on the base and form a first tooth row and a second tooth row, the at least one second welding tooth is arranged between the first tooth row and the second tooth row, the first welding tooth and the second welding tooth have a height difference, the first welding tooth is lower than the height of the second welding tooth, so that a combined tooth-shaped structure is formed, the first welding tooth located in the peripheral area can effectively prevent the cracking of the four-corner foil caused by uneven amplitude pressure during the welding process, and the welding quality is improved; the height of the welding tooth is designed to be different, so that the welding tooth located in the middle is higher than the peripheral welding tooth, the wear degree of the peripheral welding tooth is effectively reduced, and the service life of the welding head structure is improved; the plurality of first welding teeth and the at least one second welding tooth are arranged in gaps, so that the deformation of the welding head structure during the welding process can be effectively reduced, and the service life of the welding head is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to make the content of the utility model more easily understood clearly, the utility model will be further explained in detail in the following according to the specific embodiment of the utility model and combining with the drawings, wherein.

[0031] Figure 1 It is the partial structure schematic view of the tab on the battery monomer of the first kind of implementation mode of the utility model.

[0032] Figure 2 It is the partial structure schematic view of the tab on the battery monomer of the second kind of implementation mode of the utility model.

[0033] Figure 3 Figure 3 is a partial structure schematic diagram of the tab on the battery monomer of the third embodiment of the utility model.

[0034] Figure 4 Figure 5 is the overall structure schematic diagram of the ultrasonic welding head structure of the utility model.

[0035] Figure 5 Figure 6 is the overhead structure schematic diagram of the first specific embodiment of the ultrasonic welding head structure of the utility model.

[0036] Figure 6 Figure 7 is the overhead schematic diagram of the second specific embodiment of the ultrasonic welding head structure of the utility model.

[0037] Figure 7 Figure 8 is the three-dimensional structure schematic diagram of Figure 6 Figure 9 is the three-dimensional structure schematic diagram of

[0038] Figure 8 Figure 10 is the three-dimensional structure schematic diagram of the third specific embodiment of the ultrasonic welding head structure of the utility model.

[0039] Figure 9 Figure 11 is the overhead schematic diagram of the fourth specific embodiment of the ultrasonic welding head structure of the utility model.

[0040] Figure 10 Figure 12 is the cross-sectional structure schematic diagram of the first specific embodiment of the utility model in overhead.

[0041] Description of the Drawings: 10, welding mark pit area; 101, first inner recess; 102, second inner recess; 103, third inner recess; 1, base; 2, first welding tooth; 20, third welding tooth; 3, second welding tooth. DETAILED DESCRIPTION

[0042] The utility model will be further described below in conjunction with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model. Example One

[0043] Referring to Figure 1 The utility model discloses a kind of battery monomer, including battery core body;

[0044] The battery monomer further includes tab, the tab is connected with the battery core body.

[0045] The tab includes a first region and a second region, the first region does not deform during the tab welding process, for example, at least part of the first region is connected with the battery body, and the second region is a region in contact with the welding head during the welding process. The second region includes a transition region and a welding indentation region 10, and the transition region is located between the welding indentation region 10 and the first region. The tab includes at least one tab sheet, and during the manufacturing process of the battery monomer, the tab sheets are separated from each other and are not connected with each other, and the tab sheets are melted and integrated by welding.

[0046] Specifically, the welding indentation region 10 includes a plurality of first inner recesses 101 and at least one second inner recess 102, the plurality of first inner recesses 101 are arranged at least on opposite edges of the welding indentation region 10, the plurality of first inner recesses 101 are arranged in a first direction of the welding indentation region 10 to form a first recess row and a second recess row, and the second inner recess 102 is located between the first recess row and the second recess row. The depth of the first inner recess 101 is less than the depth of the second inner recess 102.

[0047] Therefore, it can be known that the battery monomer to be protected by the utility model includes a battery body and a tab connected to the battery body, the tab has a welding indentation region 10, and during the welding process, under the mutual contact action of the welding head structure and the tab, the welding indentation region 10 can form a plurality of first inner recesses 101 and at least one second inner recess 102. By such arrangement, better welding quality can be achieved, better welding precision can be achieved, and during the welding process, the tab can be effectively prevented from being welded through, the welding head structure can be prevented from cracking, the welding quality can be improved, and the service life of the ultrasonic welding head structure can be prolonged. Further, the production efficiency and production yield of the welding assembly line body can be ensured.

[0048] Specifically, the battery monomer further includes a conversion sheet, and the conversion sheet is welded and fixed with the tab. When the tab and the conversion sheet are welded, the welding head structure, the tab and the conversion sheet are sequentially arranged in the welding direction. In some embodiments, in order to improve the stability of the conversion sheet during the welding process, a support body can be arranged to support the conversion sheet.

[0049] The first embodiment is as follows:

[0050] Reference Figure 1 And Figure 4 It should be noted that during the welding process, Figure 1 The tab structure shown in the middle adopts the structure as shown in the left part of Figure 4In detail, the welding pit area 10 of the tab includes a plurality of second inner recesses 102, which are arranged in sequence along the first direction to form a third row of recesses. The plurality of first inner recesses 101 and the plurality of second inner recesses 102 correspond one to one along the second direction.

[0051] The second direction is perpendicular to the first direction.

[0052] The second implementation method is as follows:

[0053] refer to Figure 2 as well as Figure 6 It should be noted that during the welding process, Figure 2 The tab structure shown in FIG is as follows: Figure 6 Specifically, the weld impression pit area 10 includes a plurality of second inner recesses 102, which are sequentially arranged along the first direction to form a third row of recesses. Gaps 101 exist between adjacent first inner recesses, and the plurality of second inner recesses correspond to the plurality of gaps along the second direction.

[0054] The third implementation method is as follows:

[0055] refer to Figure 3 as well as Figure 9 As shown, it needs to be explained that during the welding process, Figure 3 The tab structure shown in FIG is as follows: Figure 9 In detail, the first inner recesses 101 are spaced apart at the four edges of the weld impression pit area 10, a plurality of second inner recesses 102 are provided, and the plurality of second inner recesses 102 are located within the area enclosed by the plurality of first inner recesses 101. A third inner recess 103 is provided between two adjacent second inner recesses 102, and the structure of the third inner recess 103 is the same as that of the first inner recess 101.

[0056] During the welding process, under the mutual contact between the ultrasonic welding head structure and the tab, the weld mark pit area 10 can form multiple first recessed portions 101, at least one second recessed portion 102 and a third recessed portion 103, thereby achieving a better welding effect.

[0057] As a preferred embodiment, the depth of the first inner concave portion 101 is a, 0.2 mm≤a≤0.4 mm, and the depth of the second inner concave portion 102 is a+b, 0.1 mm≤b≤1.5 mm.

[0058] Further, refer to Figures 1 to 3As shown, the bottom surface of the first inner recess 101 is a circular arc; the bottom surface of the second inner recess 102 is a rectangular surface.

[0059] In detail, the side length of the rectangular surface is 0.2-0.5mm.

[0060] The following introduces four different layout modes of the first inner recess 101 and the second inner recess 102:

[0061] In the first mode, the gap between two adjacent first inner recesses 101 along the first direction is 0.2-0.4mm, specifically, it can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between two adjacent first inner recesses 101 along the second direction is 0.1-0.3mm, specifically, it can be selected as 0.1mm, 0.2mm, 0.3mm; or, the gap between two adjacent second inner recesses 102 along the first direction is 0.2-0.4mm, specifically, it can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between two adjacent second inner recesses 102 along the second direction is 0.1-0.3mm, specifically, it can be selected as 0.1mm, 0.2mm, 0.3mm; or, the gap between the adjacent first inner recess 101 and the second inner recess 102 along the first direction is 0.2-0.4mm, specifically, it can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between the adjacent first inner recess 101 and the second inner recess 102 along the second direction is 0.2-0.4mm, specifically, it can be selected as 0.2mm, 0.3mm, 0.4mm.

[0062] In the second, the gap between two first inner recesses 101 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between two first inner recesses 101 arranged adjacently along the second direction is 0.1-0.3mm, specifically, can be selected as 0.1mm, 0.2mm, 0.3mm; and, the gap between two second inner recesses 102 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between two second inner recesses 102 arranged adjacently along the second direction is 0.1-0.3mm, specifically, can be selected as 0.1mm, 0.2mm, 0.3mm; and, the gap between the first inner recess 101 and the second inner recess 102 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between the first inner recess 101 and the second inner recess 102 arranged adjacently along the second direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm.

[0063] In the third, the gap between two first inner recesses 101 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between two first inner recesses 101 arranged adjacently along the second direction is 0.1-0.3mm, specifically, can be selected as 0.1mm, 0.2mm, 0.3mm; or, the gap between two second inner recesses 102 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between two second inner recesses 102 arranged adjacently along the second direction is 0.1-0.3mm, specifically, can be selected as 0.1mm, 0.2mm, 0.3mm; and, the gap between the first inner recess 101 and the second inner recess 102 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap between the first inner recess 101 and the second inner recess 102 arranged adjacently along the second direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm.

[0064] In the fourth, the gap of two first inner recesses 101 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap of two first inner recesses 101 arranged adjacently along the second direction is 0.1-0.3mm, specifically, can be selected as 0.1mm, 0.2mm, 0.3mm; and, the gap of two second inner recesses 102 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap of two second inner recesses 102 arranged adjacently along the second direction is 0.1-0.3mm, specifically, can be selected as 0.1mm, 0.2mm, 0.3mm; or, the gap of the first inner recess 101 and the second inner recess 102 arranged adjacently along the first direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm, the gap of the first inner recess 101 and the second inner recess 102 arranged adjacently along the second direction is 0.2-0.4mm, specifically, can be selected as 0.2mm, 0.3mm, 0.4mm.

[0065] In detail, the diameter of the projection of the first inner recess 101 along the tab thickness direction is consistent with the side length of the bottom surface of the second inner recess 102. Embodiment two

[0066] The utility model discloses still disclose an ultrasonic welding head structure for cooperating the battery monomer as embodiment one carries out ultrasonic welding.

[0067] Combination Figure 4 As shown, the ultrasonic welding head structure includes the base 1;

[0068] The ultrasonic welding head structure further includes a crimping portion, the crimping portion includes the dentiform structure formed in the surface of the base 1. Specifically, the dentiform structure includes a plurality of first welding teeth 2 and at least one second welding tooth 3.

[0069] A plurality of first welding teeth 2 are arranged with a gap on at least two opposite edges of the base 1, and a plurality of first welding teeth 2 are arranged with a gap along the first direction of the base 1 to form a first tooth row and a second tooth row, and the second welding tooth 3 is arranged between the first tooth row and the second tooth row.

[0070] It should be noted that the first inner recess 101 in the embodiment one corresponds to the first welding tooth 2, the second inner recess 102 corresponds to the second welding tooth 3, the first recess row corresponds to the first tooth row, and the second recess row corresponds to the second tooth row. Thus, the welding quality can be improved, and the cracking of the welding head can be avoided.

[0071] Since the height of the first welding tooth 2 is less than the height of the second welding tooth 3, the ultrasonic welding head structure is arranged to have a structure with a middle part being high and a peripheral part being low. Thus, the cracking of the foil around the welding head during the welding process due to uneven amplitude pressure can be effectively avoided, and the welding quality is improved.

[0072] Therefore, it can be known that the ultrasonic welding head structure comprises a base 1 and a pressure joint part arranged on the base 1. The pressure joint part comprises a tooth-shaped structure arranged protruding on the surface of the base 1. The tooth-shaped structure comprises a plurality of first welding teeth 2 and at least one second welding tooth 3. The plurality of first welding teeth 2 are arranged in gaps on the base 1 at opposite edges and form a first tooth row and a second tooth row. The at least one second welding tooth 3 is arranged between the first tooth row and the second tooth row. The first welding tooth 2 has a height difference with the second welding tooth 3, and the height of the first welding tooth 2 is lower than that of the second welding tooth 3. Thus, a combined tooth-shaped structure is formed. The first welding tooth 2 located in the peripheral area can effectively avoid the cracking of the foil around the welding head during the welding process due to uneven amplitude pressure, and the welding quality is improved. The height of the welding tooth is designed to be different, so that the welding tooth located in the middle is higher than the welding tooth located in the periphery. Thus, the wear degree of the welding tooth in the periphery is effectively reduced, and the service life of the welding head structure is improved. The plurality of first welding teeth 2 and the at least one second welding tooth 3 are arranged in gaps. Thus, the deformation of the welding head structure during the welding process can be effectively reduced, and the service life of the welding head is improved.

[0073] Further, as shown in Figure 1 , Figure 4 and Figure 5 , the tooth-shaped structure adopts a parallel arrangement mode, Figure 1 the tab shown in Figure 4 is welded by using the ultrasonic welding head structure. Specifically, the tooth-shaped structure comprises a plurality of second welding teeth 3. The plurality of second welding teeth 3 are arranged in a third tooth row in sequence along the first direction. The plurality of first welding teeth 2 and the plurality of second welding teeth 3 correspond to each other along a second direction, and the second direction is perpendicular to the first direction.

[0074] Further, as shown in Figure 2 , Figure 6 and Figure 7 , the tooth-shaped structure adopts a cross arrangement mode, Figure 2 the tab shown in Figure 5The tab is welded by the ultrasonic welding head structure shown in the figure. Specifically, the tooth-shaped structure includes a plurality of second welding teeth 3, the plurality of second welding teeth 3 are arranged in the first direction to form a third row of teeth, there is a gap between adjacent first welding teeth 2, the plurality of second welding teeth 3 and the plurality of gaps are one-to-one corresponding in the second direction, and the minimum unit of the combination of the first welding teeth 2 and the second welding teeth 3 is as shown in the figure. Figure 6 Four low first welding teeth 2 surround the center of the region, and a high second welding tooth 3 is arranged at the center, so that this arrangement is more conducive to eliminating the stress at the middle position of the tab during welding, thereby reducing tab cracking and welding tooth wear.

[0075] In other embodiments, in combination Figure 8 As shown, the third row of teeth can also be arranged in two parallel groups, or the third row of teeth can be designed to be in multiple parallel groups according to actual production needs.

[0076] Referring to Figure 3 and Figure 9 As shown, the tooth-shaped structure adopts a mixed arrangement, Figure 3 The tab is welded by the ultrasonic welding head structure shown in the figure. Specifically, the tooth-shaped structure includes a plurality of second welding teeth 3, the plurality of second welding teeth 3 are arranged in the first direction to form a third row of teeth, there is a gap between adjacent first welding teeth 2, the plurality of second welding teeth 3 and the plurality of gaps are one-to-one corresponding in the second direction, and the minimum unit of the combination of the first welding teeth 2 and the second welding teeth 3 is as shown in the figure.

[0077] Further, the surface of the first welding tooth 2 in contact with the tab is a circular arc, and the shape of the first welding tooth 2 includes but is not limited to a hemispherical shape, a spherical shape, and a structure with a circular arc at the top. Preferably, the first welding tooth 2 adopts a hemispherical structure.

[0078] Further, the surface of the second welding tooth 3 in contact with the tab is a rectangular surface, and the shape of the second welding tooth 3 includes but is not limited to a cube, a trapezoidal prism, and a structure with a rectangular cross-section at the top. Preferably, the second welding tooth 3 adopts a trapezoidal prism structure. The side length of the rectangular surface is set to 0.2-0.5mm.

[0079] Due to the different structures of the first welding tooth 2 and the second welding tooth 3, they have different characteristics. Specifically, the first welding tooth 2 has no obvious sharp features, so the penetration ability is relatively low during welding, while the second welding tooth 3 has a convex shape, so it has strong penetration ability. In addition, the structure of the second welding tooth 3 has good wear resistance, which can also play an important role in improving the service life of the welding head. Therefore, when the first welding tooth 2 and the second welding tooth 3 are combined and designed, the welding deformation and cracking can be reduced under the premise of ensuring the welding penetration, thereby effectively protecting the welding head structure.

[0080] As a preferred embodiment, according to Figure 10 As shown, in order to adapt to the size of the first inner recess 101, the height of the first welding tooth 2 is c, 0.2 mm≤c≤0.4 mm; in order to adapt to the size of the second inner recess 102, the height of the second welding tooth 3 is c+d, 0.1 mm≤d≤1.5 mm.

[0081] In this way, since the first welding tooth 2 has poor wear resistance, after being combined with the second welding tooth 3, due to the good wear resistance of the second welding tooth 3, and the height difference design of the first welding tooth 2 and the second welding tooth 3, the height of the first welding tooth 2 is less than that of the second welding tooth 3, thereby reducing the wear degree of the first welding tooth 2 to a certain extent during welding, indirectly improving the service life of the first welding tooth 2, and also delaying the wear degree of the combined welding tooth. This height difference design of the welding head can effectively ensure that the working conditions of each tooth shape are consistent, thereby prolonging the service life of the welding head.

[0082] For different tooth shapes, ultrasonic welding life verification comparison is carried out. The same welding material, welding layer and welding area are used, and the welding verification result is:

[0083] The service life of the welding head structure using only the first welding head 2 is about 400,000 times;

[0084] The service life of the welding head structure using only the second welding head 3 is about 600,000 times;

[0085] The service life of the welding head structure using the combination of the first welding head 2 and the second welding head 3 is more than 1,200,000 times.

[0086] Therefore, by the cooperation of the first welding tooth 2 and the second welding tooth 3, the wear rate of the first welding tooth 2 can be effectively slowed down, and the friction wear area of the second welding tooth 3 can also be reduced, thereby effectively prolonging the service life of the welding tooth structure. By the cooperation of the first welding tooth 2 and the second welding tooth 3 in different forms, the welding tooth structure as a whole has a form of high in the middle and low at the periphery, and by different combination arrangement modes, the cracking of the welding tooth structure during welding can be effectively avoided, thereby effectively improving the welding quality and prolonging the service life of the welding tooth.

[0087] In detail, because welding teeth with different structures have different penetration capabilities, the stronger the penetration capability, the more the number of tab layers. For example, the welding tooth structure combined by the square welding tooth and the circular welding tooth can weld 0-40 tab layers, the welding tooth structure combined by the trapezoidal prism welding tooth and the circular welding tooth can weld 40-80 tab layers, and the welding tooth structure combined by the conical welding tooth and the circular welding tooth can weld more than 80 tab layers.

[0088] Because the gap between the welding teeth is designed to be too large, the welding effect will be weakened, and if the gap is too small, the welding will fail. Therefore, it is particularly important to select an appropriate gap between the welding teeth. Correspondingly, the gap between the two first welding teeth 2 arranged adjacent to each other along the first direction is 0.2-0.4 mm, specifically, 0.2 mm, 0.3 mm, or 0.4 mm, the gap between the two first welding teeth 2 arranged adjacent to each other along the second direction is 0.1-0.3 mm, specifically, 0.1 mm, 0.2 mm, or 0.3 mm, the gap between the two second welding teeth 3 arranged adjacent to each other along the first direction is 0.2-0.4 mm, specifically, 0.2 mm, 0.3 mm, or 0.4 mm, the gap between the two second welding teeth 3 arranged adjacent to each other along the second direction is 0.1-0.3 mm, specifically, 0.1 mm, 0.2 mm, or 0.3 mm, the gap between the first welding tooth 2 and the second welding tooth 3 arranged adjacent to each other along the first direction is 0.2-0.4 mm, specifically, 0.2 mm, 0.3 mm, or 0.4 mm, and the gap between the first welding tooth 2 and the second welding tooth 3 arranged adjacent to each other along the second direction is 0.2-0.4 mm, specifically, 0.2 mm, 0.3 mm, or 0.4 mm.

[0089] As a preferred embodiment, in order to improve the consistency and uniformity of welding, the diameter of the first welding tooth 2 projected along the height direction is consistent with the side length of the bottom surface of the second welding tooth 3. Embodiment three

[0090] The utility model discloses still disclose a kind of batteries, including the battery monomer as described in embodiment one. Example four

[0091] The utility model discloses still disclose a kind of electric devices, electric device includes the battery as described in embodiment three.

[0092] Electric device and equipment can be car, portable device, notebook computer, ship, spacecraft, electric toy and electric tool etc.. Car can be fuel car, gas car or new energy car, new energy car can be pure electric car, hybrid car or range extended car etc.;Spacecraft includes airplane, rocket, space shuttle and spacecraft etc.;Electric toy includes fixed or mobile electric toy, for example, game machine, electric car toy, electric ship toy and electric airplane toy etc.;Electric tool includes metal cutting electric tool, grinding electric tool, assembly electric tool and railway electric tool, for example, electric drill, electric grinder, electric wrench, electric screwdriver, electric hammer, impact drill, concrete vibrator and electric planer etc..The embodiment in the application does not make special limitation to the above-mentioned electric equipment.

[0093] In the description of the embodiment of the utility model, it also needs to be explained that, unless there is explicit provision and limitation, if the term "arrangement", "connection" appears, it should be understood in a broad sense, for example, it can be fixed connection, can be detachable connection, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through intermediate medium;It can be the communication inside two elements or the interaction relationship of two elements.Ordinary skilled in the art can understand the specific meaning of the above-mentioned terms in the utility model according to specific circumstances.

[0094] In the description of the utility model, it needs to be understood that, the term "first", "second" is only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more, unless there is explicit specific limitation.

[0095] In the utility model, unless there is explicit provision and limitation, the term "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, can be detachable connection, or integrated;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through intermediate medium;It can be the communication inside two elements or the interaction relationship of two elements.Ordinary skilled in the art can understand the specific meaning of the above-mentioned terms in the utility model according to specific circumstances.

[0096] Obviously, the above embodiments are merely exemplary and not limiting. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhaustively listed. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A battery cell, characterized by: The application relates to a battery cell, which comprises a battery cell body, a tab connected to the battery cell body, the tab comprising a first region and a second region, the second region comprising a transition region and a welding pit region (10), the transition region being located between the welding pit region (10) and the first region, the welding pit region (10) comprising a plurality of first concave parts (101) and at least one second concave part (102), the plurality of first concave parts (101) being arranged at at least two opposite edges of the welding pit region (10) in a first direction of the welding pit region (10) to form a first concave row and a second concave row, the second concave part (102) being located between the first concave row and the second concave row, the depth of the first concave part (101) being smaller than the depth of the second concave part (102). The welding pit region (10) comprises a plurality of second concave parts (102), the plurality of second concave parts (102) being arranged in a third concave row in the first direction, the plurality of first concave parts (101) and the plurality of second concave parts (102) corresponding to each other in a second direction, the second direction being perpendicular to the first direction. The welding pit region (10) comprises a plurality of second concave parts (102), the plurality of second concave parts (102) being arranged in a third concave row in the first direction, the first concave parts (101) being arranged in gaps, the plurality of second concave parts and the plurality of gaps corresponding to each other in the second direction.

2. The battery cell of claim 1, wherein: The first concave parts (101) are arranged in gaps at four edges of the welding pit region (10), the second concave parts (102) being arranged in a region surrounded by the first concave parts (101), the third concave parts (103) being arranged between two adjacent second concave parts (102), the third concave parts (103) having the same structure as the first concave parts (101).

3. The battery cell of claim 1, wherein: The depth of the first concave part (101) is a, 0.2 mm<=a<=0.4 mm, the depth of the second concave part (102) is a+b, 0.1 mm<=b<=1.5 mm.

4. The battery cell of claim 1, wherein: The bottom surface of the first concave part (101) is a circular arc, and the bottom surface of the second concave part (102) is a rectangular surface.

5. The battery cell of claim 1, wherein: ​ 6. The battery cell of any one of claims 1-5, wherein: ​ 7. The battery cell of claim 6, wherein: The gap between two adjacent first inner recesses (101) along the first direction is 0.2-0.4 mm, and the gap between two adjacent first inner recesses (101) along the second direction is 0.1-0.3 mm; and / or, the gap between two adjacent second inner recesses (102) along the first direction is 0.2-0.4 mm, and the gap between two adjacent second inner recesses (102) along the second direction is 0.1-0.3 mm; and / or, the gap between the first inner recess (101) and the second inner recess (102) along the first direction is 0.2-0.4 mm, and the gap between the first inner recess (101) and the second inner recess (102) along the second direction is 0.2-0.4 mm.

8. The battery cell of claim 6, wherein: The edge length of the rectangular face is 0.2-0.5 mm.

9. The battery cell of claim 7, wherein: The diameter of the projection of the first inner recess (101) along the tab thickness direction is consistent with the edge length of the bottom surface of the second inner recess (102).

10. An ultrasonic horn structure, characterized by: Comprising, The base (1); The crimping part comprises a tooth-shaped structure protruding from the surface of the base (1), the tooth-shaped structure comprises a plurality of first welding teeth (2) and at least one second welding tooth (3), a plurality of first welding teeth (2) are arranged with gaps on at least two opposite edges of the base (1), a plurality of first welding teeth (2) are arranged with gaps along the first direction of the base (1) to form a first tooth row and a second tooth row, and the second welding tooth (3) is arranged between the first tooth row and the second tooth row; the height of the first welding tooth (2) is less than the height of the second welding tooth (3).

11. An ultrasonic horn structure according to claim 10 wherein: The tooth-shaped structure comprises a plurality of second welding teeth (3), a plurality of second welding teeth (3) are arranged in sequence along the first direction to form a third tooth row, a plurality of first welding teeth (2) and a plurality of second welding teeth (3) are one-to-one corresponding along the second direction, and the second direction is perpendicular to the first direction.

12. An ultrasonic horn structure according to claim 10 wherein: The tooth-shaped structure comprises a plurality of second welding teeth (3), a plurality of second welding teeth (3) are arranged in sequence along the first direction to form a third tooth row, and there is a gap between adjacent first welding teeth (2), a plurality of second welding teeth (3) and a plurality of gaps are one-to-one corresponding along the second direction.

13. An ultrasonic horn structure according to claim 10 wherein: The first welding teeth (2) are arranged with gaps on the four edges of the base (1), the second welding teeth (3) are provided in plurality, the plurality of second welding teeth (3) are located in the area surrounded by the plurality of first welding teeth (2), a third welding tooth (20) is arranged between two adjacent second welding teeth, and the third welding tooth (20) has the same structure as the first welding tooth (2).

14. An ultrasonic horn structure according to claim 10 wherein: The height of the first welding tooth (2) is c, 0.2 mm≤c≤0.4 mm, and the height of the second welding tooth (3) is c+d, 0.1 mm≤d≤1.5 mm.

15. An ultrasonic horn structure according to any one of claims 10-14, characterized in that: The surface of the first welding tooth (2) in contact with the tab is a circular arc, and the surface of the second welding tooth (3) in contact with the tab is a rectangular face.

16. An ultrasonic horn structure according to claim 15 wherein: The gap between two first welding teeth (2) arranged adjacently along the first direction is 0.2-0.4mm, the gap between two first welding teeth (2) arranged adjacently along the second direction is 0.1-0.3mm; and / or, the gap between two second welding teeth (3) arranged adjacently along the first direction is 0.2-0.4mm, the gap between two second welding teeth (3) arranged adjacently along the second direction is 0.1-0.3mm; and / or, the gap between the first welding tooth (2) and the second welding tooth (3) arranged adjacently along the first direction is 0.2-0.4mm, the gap between the first welding tooth (2) and the second welding tooth (3) arranged adjacently along the second direction is 0.2-0.4mm.

17. An ultrasonic horn structure according to claim 15 wherein: The side length of the rectangular face is 0.2-0.5mm.

18. An ultrasonic horn structure according to claim 15 wherein: The diameter of the first welding tooth (2) projected along the height direction is consistent with the side length of the bottom face of the second welding tooth (3).

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