Battery and welding head

Abstract

The utility model relates to a battery and a welding head, and relates to the technical field of battery manufacturing, the battery comprises a battery cell and a tab, the tab is connected with the battery cell, the tab is provided with at least one welding printing unit, and the welding printing unit is provided with a first middle area, a first edge area and a second edge area, at least one first welding printing groove is formed in the first middle area, at least one second welding printing groove is formed in each of the first edge area and the second edge area, and the depth of the first welding printing groove is larger than that of the second welding printing groove. According to the battery and the welding head provided by the embodiment of the invention, the problem that the tooth heights of different parts of the welding head are easy to generate deformation deflection can be improved, the ultrasonic welding quality is improved, and the service life of the welding head is prolonged.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a battery and a welding head. Background Technology

[0002] Ultrasonic welding primarily uses mechanical vibration to weld two metal workpieces. In battery manufacturing, a welding head is used to ultrasonically weld tabs and other components. During ultrasonic welding, under certain welding pressure, the welding head comes into close contact with the tabs, causing wear on the contact surface. In practical applications, the center of the welding head experiences greater stress and more severe wear than the edges, leading to deformation and deflection of the teeth at different points on the welding head. This affects the quality of the ultrasonic welding and shortens the lifespan of the welding head. Furthermore, because the center of the welding head experiences greater stress than the edges during welding, the tabs are more prone to tearing, resulting in poor welding. Utility Model Content

[0003] To address the aforementioned technical problems, embodiments of this application provide a battery and a welding head that can improve the problem of deformation and deflection easily caused by the tooth height at different parts of the welding head, thereby enhancing the quality of ultrasonic welding and extending the service life of the welding head.

[0004] In a first aspect, a battery is provided, comprising:

[0005] Battery cell;

[0006] The electrode tab is connected to the battery cell. The electrode tab is provided with at least one soldering unit. The soldering unit has a first intermediate region and a first edge region and a second edge region disposed on both sides in a first direction. The first intermediate region includes at least one first soldering groove, and both the first edge region and the second edge region include at least one second soldering groove. The depth of the first soldering groove is greater than the depth of the second soldering groove.

[0007] According to a first aspect of this application, along the first direction, the soldering unit further includes a first transition region, a portion of which is located between the first intermediate region and the first edge region, and another portion of which is located between the first intermediate region and the second edge region. The first transition region includes at least one third soldering groove, and the depth of the third soldering groove is greater than the depth of the second soldering groove.

[0008] According to a first aspect of this application, along the direction from the first intermediate region to the first edge region, the depth of the first solder groove, the depth of the third solder groove, and the depth of the second solder groove gradually decrease; along the direction from the first intermediate region to the second edge region, the depth of the first solder groove, the depth of the third solder groove, and the depth of the second solder groove gradually decrease.

[0009] According to a first aspect of this application, along the first direction, the depths of the first solder groove, the second solder groove, and the third solder groove in the same soldering unit satisfy a first preset parabolic equation.

[0010] The first preset parabola equation satisfies:

[0011] H1=△k1*n1 2 +h1;

[0012] Wherein, H1 represents the depth of the first solder groove with the largest depth; h1 represents the depth of the second solder groove with the smallest depth; n1 represents the total number of the first solder groove, the second solder groove, and the third solder groove that exist between the first solder groove with the largest depth and the second solder groove with the smallest depth; △k1 represents the decreasing slope, which is a constant.

[0013] According to a first aspect of this application, H1 satisfies: 1.5mm≤H1≤2mm; h1 satisfies: 0.2mm≤h1≤0.3mm; and n1 satisfies: 2pcs≤n1≤10pcs.

[0014] According to a first aspect of this application, along the first direction, the first intermediate region includes at least two first solder grooves of the same depth, and the at least two first solder grooves form a first solder groove group; both the first edge region and the second edge region include at least two second solder grooves of the same depth, and the at least two second solder grooves form a second solder groove group; the first transition region located between the first edge region and the first intermediate region and the first transition region located between the second edge region and the first intermediate region both include at least two third solder grooves of the same depth, and the at least two third solder grooves form a third solder groove group;

[0015] Along the direction from the first intermediate region to the first edge region, the average depth of the first solder groove group, the average depth of the third solder groove group, and the average depth of the second solder groove group gradually decrease.

[0016] Along the direction from the first intermediate region to the second edge region, the average depth of the first solder groove group, the average depth of the third solder groove group, and the average depth of the second solder groove group gradually decrease.

[0017] According to a first aspect of this application, the average depth of the first solder groove group is C, the average depth of the second solder groove group is D, and the average depth of the third solder groove group is E, wherein C, D, and E respectively satisfy: 1.8mm≤C≤2mm, 0.5mm≤D≤0.8mm, and 1.2mm≤E≤1.5mm.

[0018] Secondly, a welding head is also provided, comprising:

[0019] At least one welding tooth unit has a second intermediate region and a third edge region and a fourth edge region disposed on both sides of a second direction. The second intermediate region includes at least one first welding tooth, and the third edge region and the fourth edge region each include at least one second welding tooth. The height of the first welding tooth is greater than the height of the second welding tooth.

[0020] According to a second aspect of this application, along the second direction, the welding tooth unit further includes a second transition region, a portion of which is located between the second intermediate region and the third edge region, and another portion of which is located between the second intermediate region and the fourth edge region. The second transition region includes at least one third welding tooth, and the height of the third welding tooth is greater than the height of the second welding tooth.

[0021] According to a second aspect of this application, along the direction from the second intermediate region to the third edge region, the height of the first weld tooth, the height of the third weld tooth, and the height of the second weld tooth gradually decrease; along the direction from the second intermediate region to the fourth edge region, the height of the first weld tooth, the height of the third weld tooth, and the height of the second weld tooth gradually decrease.

[0022] According to a second aspect of this application, along the second direction, the heights of the first weld tooth, the second weld tooth, and the third weld tooth in the same weld tooth unit satisfy a second preset parabolic equation.

[0023] The second preset parabola equation satisfies:

[0024] H2=△k2*n2 2 +h2;

[0025] Wherein, H2 represents the height of the first welding tooth with the largest height; h2 represents the height of the second welding tooth with the smallest height; n2 represents the total number of the first welding tooth, the second welding tooth, and the third welding tooth that exist between the first welding tooth with the largest height and the second welding tooth with the smallest height; Δk2 represents the decreasing slope, which is a constant.

[0026] According to a second aspect of this application, H2 satisfies: 1.5mm≤H2≤2mm; h2 satisfies: 0.2mm≤h2≤0.3mm; and n2 satisfies: 2pcs≤n2≤10pcs.

[0027] According to a second aspect of this application, along the second direction, the second intermediate region includes at least two first welding teeth of the same height, and the at least two first welding teeth form a first welding tooth group; both the third edge region and the fourth edge region include at least two second welding teeth of the same height, and the at least two second welding teeth form a second welding tooth group; the second transition region located between the third edge region and the second intermediate region and the second transition region located between the fourth edge region and the second intermediate region both include at least two third welding teeth of the same height, and the at least two third welding teeth form a third welding tooth group;

[0028] Along the direction from the second intermediate region to the third edge region, the average height of the first welding tooth group, the average height of the third welding tooth group, and the average height of the second welding tooth group gradually decrease;

[0029] Along the direction from the second intermediate region to the fourth edge region, the average height of the first welding tooth group, the average height of the third welding tooth group, and the average height of the second welding tooth group gradually decrease.

[0030] According to a second aspect of this application, the average depth of the first welding tooth group is F, the average depth of the second welding tooth group is G, and the average depth of the third welding tooth group is J, wherein F, G, and J respectively satisfy: 1.8mm≤F≤2mm, 0.5mm≤G≤0.8mm, and 1.2mm≤J≤1.5mm.

[0031] The battery provided in this application embodiment has a first solder groove in the first middle region of the tab that is deeper than the second solder groove in the first edge region and the second edge region. This effectively reduces the possibility of cracking at the edge of the solder groove during the welding process, improves the welding yield of the battery cell, effectively enhances the ultrasonic welding quality, and improves the battery performance.

[0032] The welding head provided in this application embodiment has a height of the first welding tooth in the second intermediate region that is greater than the height of the second welding tooth in the third and fourth edge regions. In this way, although the welding tooth in the middle position of the welding head wears more severely, the height difference between the welding tooth in the middle position and the welding tooth in the edge position will not increase significantly. This effectively improves the problem of deformation and deflection of the tooth height in different parts of the welding head during ultrasonic welding, reduces the probability of internal concavity of the welding tooth, improves the problem of incomplete welding during the welding process, effectively improves the ultrasonic welding quality, and extends the service life of the welding head. Attached Figure Description

[0033] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0034] Figure 1 This is a schematic diagram of a tab structure containing multiple solder pad units, provided as an exemplary embodiment of this application.

[0035] Figure 2 A cross-sectional view of a tab including a solder stamp unit provided for an exemplary embodiment of this application.

[0036] Figure 3 A cross-sectional view of a tab including a solder stamp unit, provided for another exemplary embodiment of this application.

[0037] Figure 4 This is a schematic diagram of the welding head structure of a plurality of welding tooth units provided for an exemplary embodiment of this application.

[0038] Figure 5 A cross-sectional view of a welding head provided for an exemplary implementation of this application.

[0039] Figure 6 A cross-sectional view of a welding head provided for another exemplary embodiment of this application.

[0040] Reference numerals: 100 - Solder stamp unit; 110 - First intermediate region; 120 - First edge region; 130 - Second edge region; 140 - First solder stamp groove; 150 - Second solder stamp groove; 160 - First transition region; 170 - Third solder stamp groove; 180 - First solder stamp groove group; 190 - Second solder stamp groove group; 200 - Third solder stamp groove group; 300 - Welding tooth unit; 310 - Second intermediate region; 320 - Third edge region; 330 - Fourth edge region; 340 - First welding tooth; 350 - Second welding tooth; 360 - Second transition region; 370 - Third welding tooth; 380 - First welding tooth group; 390 - Second welding tooth group; 400 - Third welding tooth group. Detailed Implementation

[0041] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0042] The battery provided in this application embodiment may include a cell and a tab. The tab is connected to the cell. In practical applications, a welding head is usually used to ultrasonically weld the tab to other components, for example, to ultrasonically weld the tab to an adapter plate.

[0043] In related technologies, the contact surface between the welding head and the electrode tab experiences wear during ultrasonic welding. Furthermore, because the center of the welding head experiences greater stress than the edges, the wear is more severe, causing deformation and deflection of the teeth at different locations on the welding head. This affects the ultrasonic welding quality and shortens the welding head's lifespan. Additionally, during welding, the greater stress in the center of the welding head makes the electrode tab prone to tearing, resulting in poor welding. Therefore, the welding head provided in this application for welding batteries can improve upon the aforementioned problems.

[0044] Figure 1 This is a schematic diagram of a tab structure containing multiple solder pad units, provided as an exemplary embodiment of this application. Figure 2 This is a cross-sectional view including solder pads for an exemplary embodiment of this application. Figure 1 and Figure 2 As shown, the electrode tab is provided with at least one soldering unit 100. Each soldering unit 100 has a first intermediate region 110, a first edge region 120, and a second edge region 130. The first intermediate region 110 is located between the first edge region 120 and the second edge region 130. The first edge region 120 and the second edge region 130 are along a first direction (reference). Figure 2The directions indicated by the middle arrows A1 and B1 are provided on both sides of the first intermediate region 110. The first intermediate region 110 includes at least one first solder groove 140, and the first edge region 120 and the second edge region 130 each include at least one second solder groove 150.

[0045] It should be noted that the depth of the first welding groove 140 is greater than the depth of the second welding groove 150. Specifically, the height of the welding teeth corresponding to the first welding groove 140 (the welding teeth located in the middle of the welding head) is greater than the height of the welding teeth corresponding to the second welding groove 150 (the welding teeth located at the edge of the welding head). In practical applications, when welding battery tabs using the above-mentioned welding head, the height difference of the welding teeth on the welding head makes the depth of the first welding groove 140 in the first middle region 110 greater than the depth of the second welding groove 150 in the first edge region 120 and the second edge region 130. This effectively improves the problem of uneven stress on the middle and edge of the tab during welding, which easily leads to tearing of the tab at the edge. This effectively improves the ultrasonic welding quality and extends the service life of the welding head.

[0046] In one embodiment, the number of soldering units 100 can be one, two, three, etc.

[0047] In one embodiment, when there are two or more soldering units 100, the multiple soldering units 100 are arranged in parallel.

[0048] In one embodiment, the number of first solder grooves 140 included in the first intermediate region 110 can be one, two, three, etc.

[0049] In one embodiment, when the number of first solder grooves 140 included in the first intermediate region 110 is multiple (two or more), the depths of the multiple first solder grooves 140 may be equal or unequal.

[0050] In one embodiment, the number of second solder grooves 150 included in the first edge region 120 can be one, two, three, etc.

[0051] In one embodiment, when there are multiple (two or more) second solder grooves 150 included in the first edge region 120, the depths of the multiple second solder grooves 150 may be equal or unequal.

[0052] In one embodiment, the number of second solder grooves 150 included in the second edge region 130 can be one, two, three, etc.

[0053] In one embodiment, when there are multiple (two or more) second solder grooves 150 included in the second edge region 130, the depths of the multiple second solder grooves 150 may be equal or unequal.

[0054] In one embodiment, the number of second solder grooves 150 included in the first edge region 120 may be equal to or unequal to the number of second solder grooves 150 included in the second edge region 130.

[0055] like Figure 2 As shown, along the first direction, the soldering unit 100 may also include a first transition region 160, a portion of which is located between the first intermediate region 110 and the first edge region 120, and another portion of which is located between the first intermediate region 110 and the second edge region 130. The first transition region 160 includes at least one third soldering groove 170.

[0056] It should be noted that the depth of the third weld groove 170 is greater than the depth of the second weld groove 150, and the height of the welding teeth in the welding head corresponding to the third weld groove 170 is greater than the height of the welding teeth in the welding head corresponding to the second weld groove 150.

[0057] In one embodiment, the number of third solder grooves 170 included in the first transition region 160 located between the first intermediate region 110 and the first edge region 120 can be one, two, three, etc.

[0058] In one embodiment, the number of third solder grooves 170 included in the first transition region 160 located between the first intermediate region 110 and the second edge region 130 can be one, two, three, etc.

[0059] In one embodiment, the number of third solder grooves 170 included in the first transition region 160 between the first intermediate region 110 and the first edge region 120 may be equal to or unequal to the number of third solder grooves 170 included in the first transition region 160 between the first intermediate region 110 and the first edge region 120.

[0060] like Figure 2 As shown, along the direction from the first intermediate region 110 to the first edge region 120, the depths of the first solder groove 140, the third solder groove 170, and the second solder groove 150 gradually decrease. Thus, the heights of the weld teeth in the welding head corresponding to the first solder groove 140, the third solder groove 170, and the second solder groove 150 also gradually decrease.

[0061] It should be understood that by designing the height of the welding teeth to gradually decrease and smoothly transition along the direction from the first intermediate region 110 to the first edge region 120, the overall welding tooth structure on the welding head is arranged in an arch-like shape. During ultrasonic welding, the height difference between the welding teeth in different parts of the welding head will not increase significantly, effectively solving the problem of local cracking caused by uneven stress in different areas of the electrode tab. At the same time, it can also effectively improve the problem of certain deformation and deflection of the tooth height in different parts of the welding head, improve the quality of ultrasonic welding, and extend the service life of the welding head.

[0062] Similarly, along the direction from the first intermediate region 110 to the second edge region 130, the height of the welding teeth in the welding head corresponding to the first welding groove 140, the third welding groove 170, and the second welding groove 150 gradually decreases. The height difference between the welding teeth in different parts of the welding head does not increase significantly. Correspondingly, the depth of the first welding groove 140, the third welding groove 170, and the second welding groove 150 formed on the electrode tab gradually decreases. This effectively solves the problem of local cracking caused by uneven stress in different areas of the electrode tab. At the same time, it can also effectively improve the problem of certain deformation and deflection of the tooth height in different parts of the welding head, improve the ultrasonic welding quality, and extend the service life of the welding head.

[0063] like Figure 2 As shown, along the first direction, the depths of the first solder groove 140, the second solder groove 150, and the third solder groove 170 in the same solder unit 100 satisfy a first preset parabolic equation. Specifically, the first preset parabolic equation satisfies:

[0064] H1=△k1*n1 2 +h1;

[0065] Wherein, H1 represents the depth of the first solder groove 140 with the largest depth; h1 represents the depth of the second solder groove 150 with the smallest depth; n1 represents the total number of first solder grooves 140, second solder grooves 150 and third solder grooves 170 that exist between the first solder groove 140 with the largest depth and the second solder groove 150 with the smallest depth; △k1 represents the decreasing slope, which is a constant.

[0066] It should be noted that when there are multiple first solder grooves 140, and at least some of the first solder grooves 140 have different depths, H1 selects the depth value of the first solder groove 140 with the largest depth. When there are multiple second solder grooves 150, and at least some of the second solder grooves 150 have different depths, H2 selects the depth value of the second solder groove 150 with the smallest depth.

[0067] It should be understood that the depths of the first solder groove 140, the second solder groove 150, and the third solder groove 170 in the same solder unit 100 satisfy the first preset parabolic equation, that is, the height of the corresponding welding teeth of the welding head satisfies the parabolic equation. The rate of change of the height of the welding teeth of the welding head is gradually adjusted. During the welding process, the welding teeth and the electrode tab maintain stable contact, the pressure on the contact surface is more uniform, and the wear degree of the welding teeth in different parts is more uniform, effectively avoiding a large difference in height between adjacent welding teeth.

[0068] It should be understood that if the value of H1 is too large, that is, the height of the corresponding welding teeth is too large, stress concentration is likely to occur when the two come into contact and weld, and the welding teeth are prone to breakage. If the value of H1 is too small, that is, the height of the corresponding welding teeth is too small, the contact area between the welding teeth and the electrode tab is small, the welding pressure is insufficient, and the welding quality is affected. To improve the aforementioned problems, H1 in the embodiments of this application satisfies the following range: 1.5mm ≤ H1 ≤ 2mm.

[0069] In one embodiment, H1 can be selected as 1.5mm, 1.8mm, or 2mm.

[0070] It should be understood that if h1 is too large, meaning the height of the corresponding welding teeth on the welding head is too large, the height difference between the middle welding teeth and the edge welding teeth cannot meet the trend of smooth transition, and cannot improve the situation of electrode tab welding cracking; if h1 is too small, meaning the height of the corresponding welding teeth on the welding head is too small, it may cause other areas of welding teeth to have completed welding the corresponding electrode tab while the welding teeth (edge ​​welding teeth) have not yet achieved effective contact with the electrode tab, resulting in a poor weld on the part of the electrode tab corresponding to the welding teeth (edge ​​welding teeth). To improve the aforementioned problems, h1 in the embodiments of this application satisfies the following range: 0.2mm≤h1≤0.3mm.

[0071] In one embodiment, h1 can be selected as 0.2mm, 0.25mm, or 0.3mm.

[0072] It should be understood that if n1 is too large, meaning there are too many weld grooves and too many welding teeth in the welding head used to match the weld grooves, it can easily lead to insufficient pressure on a single welding tooth, making it impossible to form an effective welding operation and affecting the overall welding quality. If n1 is too small, meaning there are too few weld grooves and too few welding teeth in the welding head used to match the weld grooves, it can easily lead to excessive pressure on a single welding tooth, accelerating wear and affecting the service life of the welding tooth. To improve the aforementioned problems, n1 in the embodiments of this application satisfies the following range: 2pcs ≤ n1 ≤ 10pcs.

[0073] In one embodiment, n1 can be selected as 2 pcs, 5 pcs, or 10 pcs.

[0074] Figure 3 A cross-sectional view of a single solder pad unit provided for another exemplary embodiment of this application. (See also...) Figure 3 As shown, along the first direction, the first intermediate region 110 includes at least two first solder grooves 140 of the same depth, and the at least two first solder grooves 140 form a first solder groove group 180.

[0075] In one embodiment, the two first solder grooves 140 in the same first solder groove group 180 have the same depth.

[0076] like Figure 3 As shown, along the first direction, both the first edge region 120 and the second edge region 130 include at least two second solder grooves 150 of the same depth, and the at least two second solder grooves 150 form a second solder groove group 190; that is, at least one second solder groove group 190 is formed in the first edge region 120 and at least one second solder groove group 190 is formed in the second edge region 130.

[0077] In one embodiment, the two second solder grooves 150 in the same second solder groove group 190 have the same depth.

[0078] like Figure 3 As shown, along the first direction, the first transition region 160 located between the first edge region 120 and the first intermediate region 110, and the first transition region 160 located between the second edge region 130 and the first intermediate region 110, both include at least two third solder grooves 170 of the same depth, and the at least two third solder grooves 170 form a third solder groove group 200; that is, there is at least one third solder groove group 200 between the first edge region 120 and the first intermediate region 110, and there is at least one third solder groove group 200 between the second edge region 130 and the first intermediate region 110.

[0079] In one embodiment, the two third solder grooves 170 in the same third solder groove group 200 have the same depth.

[0080] It should be noted that, along the direction from the first intermediate region 110 to the first edge region 120, the average depth of the first weld groove group 180, the average depth of the third weld groove group 200, and the average depth of the second weld groove group 190 gradually decrease. Correspondingly, the average height of the welding teeth groups in the welding head corresponding to the first weld groove group 180, the third weld groove group 200, and the second weld groove group 190, respectively, also gradually decreases. This ensures that during ultrasonic welding, the difference in the average height of the welding teeth groups in different parts of the welding head does not increase significantly, effectively improving the problem of deformation and deflection caused by tooth height in different parts of the welding head, improving the ultrasonic welding quality, and extending the service life of the welding head.

[0081] Similarly, along the direction from the first intermediate region 110 to the second edge region 130, the average depth of the first weld groove group 180, the average depth of the third weld groove group 200, and the average depth of the second weld groove group 190 gradually decrease. Correspondingly, the average height of the welding teeth groups in the welding head corresponding to the first weld groove group 180, the third weld groove group 200, and the second weld groove group 190, respectively, also gradually decreases. This ensures that during ultrasonic welding, the difference in average height between the welding teeth groups in different parts of the welding head does not increase significantly, effectively mitigating the problem of deformation and deflection caused by tooth height in different parts of the welding head, improving the quality of ultrasonic welding, and extending the service life of the welding head.

[0082] It should be noted that, compared to Figure 2 The depth of the solder joint groove varies in a parabolic pattern. Figure 3 In a structure where the depth of the solder groove varies in a stepped manner, the depth of the solder groove in the same area (e.g., the first intermediate area 110, the first transition area 160, the first edge area 120, and the second edge area 130) is the same, making the processing and manufacturing process more convenient.

[0083] It should be noted that if the average depth of the first weld groove group 180, the second weld groove group 190, and the third weld groove group 200 is too large or too small, it will cause an excessive difference in the average depth between adjacent weld groove groups, which in turn will cause an excessive difference in the average height of adjacent weld tooth groups in the welding head. This can easily lead to stress concentration in weld tooth groups with larger average heights and incomplete welds between weld tooth groups with smaller average heights and the weld groove groups. To improve the aforementioned problems, in the embodiments of this application, the average depth C of the first weld groove group 180, the average depth D of the second weld groove group 190, and the average depth E of the third weld groove group 200 satisfy the following relationships: 1.8mm≤C≤2mm, 0.5mm≤D≤0.8mm, 1.2mm≤E≤1.5mm.

[0084] In one embodiment, the average depth C can be selected as 1.8mm, 1.9mm, 2mm, etc.; the average depth D can be selected as 0.5mm, 0.6mm, 0.8mm, etc.; and the average depth E can be selected as 1.2mm, 1.4mm, 1.5mm, etc.

[0085] Figure 4 This is a schematic diagram of a welding head structure comprising multiple welding tooth units, provided as an exemplary embodiment of this application. Figure 5 This is a cross-sectional view of a welding head structure provided as an exemplary embodiment of this application. Figure 4 and Figure 5As shown, the welding head includes at least one welding tooth unit 300, each welding tooth unit 300 having a second intermediate region 310, a third edge region 320, and a fourth edge region 330. The second intermediate region 310 is located between the third edge region 320 and the fourth edge region 330, and the third edge region 320 and the fourth edge region 330 are along a second direction (reference). Figure 5 The directions indicated by the middle arrows A2 and B2 are set on both sides of the second intermediate region 310. The second intermediate region 310 includes at least one first welding tooth 340, and the third edge region 320 and the fourth edge region 330 each include at least one second welding tooth 350. The second direction here is the same as the first direction mentioned in the previous electrode tab section.

[0086] It should be noted that the height of the first welding tooth 340 is greater than the height of the second welding tooth 350, that is, the height of the welding tooth located in the middle of the welding head is greater than the height of the welding tooth located at the edge of the welding head.

[0087] In practical applications, the welding teeth in the center of the welding head experience greater stress than those at the edges, leading to more severe wear. The welding head provided in this embodiment addresses this issue by ensuring that the height of the first welding tooth 340 in the second intermediate region 310 is greater than the height of the second welding teeth 350 in the third and fourth edge regions 320. This prevents a significant increase in the height difference between the welding teeth in the center and at the edges, despite more severe wear in the center. This effectively mitigates the problem of deformation and deflection of the teeth at different locations during ultrasonic welding, reduces the probability of internal concavity in the welding teeth, improves the weld quality, and extends the service life of the welding head.

[0088] In one embodiment, the number of welding tooth units 300 can be one, two, three, etc.

[0089] In one embodiment, when there are two or more welding tooth units 300, the multiple welding tooth units 300 are arranged in parallel to avoid interference between the multiple welding tooth units 300.

[0090] In one embodiment, the second intermediate region 310 may include one, two, three, or other first welding teeth 340.

[0091] In one embodiment, when the number of first welding teeth 340 included in the second intermediate region 310 is multiple (two or more), the heights of the multiple first welding teeth 340 may be equal or unequal.

[0092] In one embodiment, the third edge region 320 may include one, two, three, or other second welding teeth 350.

[0093] In one embodiment, when the number of second welding teeth 350 included in the third edge region 320 is multiple (two or more), the heights of the multiple second welding teeth 350 may be equal or unequal.

[0094] In one embodiment, the fourth edge region 330 may include one, two, three, or other second weld teeth 350.

[0095] In one embodiment, when the number of second welding teeth 350 included in the fourth edge region 330 is multiple (two or more), the heights of the multiple second welding teeth 350 may be equal or unequal.

[0096] In one embodiment, the number of second welding teeth 350 included in the third edge region 320 may be equal to or unequal to the number of second welding teeth 350 included in the fourth edge region 330.

[0097] like Figure 5 As shown, along the second direction, the soldering unit may also include a second transition region 360, a portion of which is located between the second intermediate region 310 and the third edge region 320, and another portion of which is located between the second intermediate region 310 and the fourth edge region 330. The second transition region 360 includes at least one third solder tooth 370.

[0098] It should be noted that the second transition region 360 is closer to the second intermediate region 310 than the third edge region 320, and the third welding tooth 370 shows more severe wear than the second welding tooth 350. However, since the height of the third welding tooth 370 is greater than that of the second welding tooth 350, even though the third welding tooth 370 wears more severely, the height difference between the third welding tooth 370 and the second welding tooth 350 will not increase significantly. This effectively improves the problem of deformation and deflection caused by tooth height at different parts of the welding head during ultrasonic welding, improves the ultrasonic welding quality, and extends the service life of the welding head.

[0099] In one embodiment, the number of third welding teeth 370 included in the second transition region 360 located between the second intermediate region 310 and the third edge region 320 can be one, two, three, etc.

[0100] In one embodiment, the number of third welding teeth 370 included in the second transition region 360 located between the second intermediate region 310 and the fourth edge region 330 can be one, two, three, etc.

[0101] In one embodiment, the number of third welding teeth 370 included in the second transition region 360 between the second intermediate region 310 and the third edge region 320 may be equal to or unequal to the number of third welding teeth 370 included in the second transition region 360 between the second intermediate region 310 and the third edge region 320.

[0102] like Figure 5 As shown, the wear of the second welding tooth 350, the third welding tooth 370, and the first welding tooth 340 gradually increases along the direction from the third edge region 320 to the second intermediate region 310. However, the heights of the first welding tooth 340, the third welding tooth 370, and the second welding tooth 350 gradually decrease along the direction from the second intermediate region 310 to the third edge region 320. Therefore, even if the first welding tooth 340 is more worn than the third welding tooth 370, and the third welding tooth 370 is more worn than the second welding tooth 350, the height difference between the welding teeth in different regions will not increase significantly. This effectively improves the problem of deformation and deflection of the tooth height in different parts of the welding head, improves the ultrasonic welding quality, and extends the service life of the welding head.

[0103] Similarly, while the wear of the second welding tooth 350, the third welding tooth 370, and the first welding tooth 340 gradually increases along the direction from the fourth edge region 330 to the second intermediate region 310, the heights of the first welding tooth 340, the third welding tooth 370, and the second welding tooth 350 gradually decrease along the direction from the second intermediate region 310 to the fourth edge region 330. Therefore, even if the first welding tooth 340 is more worn than the third welding tooth 370, and the third welding tooth 370 is more worn than the second welding tooth 350, the height difference between the welding teeth in different regions will not increase significantly. This effectively improves the problem of deformation and deflection of the tooth height in different parts of the welding head, improves the ultrasonic welding quality, and extends the service life of the welding head.

[0104] like Figure 5 As shown, along the second direction, the heights of the first weld tooth 340, the second weld tooth 350, and the third weld tooth 370 in the same weld tooth unit 300 satisfy a second preset parabolic equation. Specifically, the second preset parabolic equation satisfies:

[0105] H2=△k2*n2 2 +h2;

[0106] Wherein, H2 represents the height value of the first welding tooth 340 with the largest height; h2 represents the height value of the second welding tooth 350 with the smallest height; n2 represents the total number of first welding teeth 340, second welding teeth 350 and third welding teeth 370 between the first welding tooth 340 with the largest height and the second welding tooth 350 with the smallest height; △k2 represents the decreasing slope, which is a constant.

[0107] It should be noted that when there are multiple first welding teeth 340, and at least some of the first welding teeth 340 have different heights, H2 selects the height value of the first welding tooth 340 with the largest height. When there are multiple second welding teeth 350, and at least some of the second welding teeth 350 have different heights, h2 selects the height value of the second welding tooth 350 with the smallest height.

[0108] It should be understood that the heights of the first welding tooth 340, the second welding tooth 350, and the third welding tooth 370 in the same welding tooth unit 300 satisfy the second preset parabolic equation. The rate of change of the welding tooth height of the welding head is gradually adjusted so that multiple welding teeth maintain stable contact with the tabs mentioned above, the pressure on the contact surface is more uniform, the wear degree of welding teeth in different parts is more uniform, and the height difference between adjacent welding teeth is effectively avoided.

[0109] It should be understood that if the value of H2 is too large, stress concentration may easily occur when the first welding tooth 340 of the welding head contacts and welds with the corresponding groove, making the welding tooth prone to breakage; if the value of H2 is too small, the contact area between the first welding tooth 340 and the corresponding groove will be small, resulting in insufficient welding pressure and affecting the welding quality. To improve the aforementioned problems, H2 in the embodiments of this application satisfies the following range: 1.5mm ≤ H2 ≤ 2mm.

[0110] In one embodiment, H2 can be selected as 1.5mm, 1.8mm, or 2mm.

[0111] It should be understood that if h2 is too large, the height transition from the second edge welding tooth 350 to the middle first welding tooth 340 may not be smooth, failing to address the issue of easy wear of the welding teeth. If h2 is too small, it may result in incomplete welding when the middle first welding tooth 340 has fully contacted the electrode tab for welding while the second welding tooth 350 has not yet made effective contact with the electrode tab. To improve the aforementioned problems, h2 in the embodiments of this application satisfies the following range: 0.2mm ≤ h2 ≤ 0.3mm.

[0112] In one embodiment, h2 can be selected as 0.2mm, 0.25mm, or 0.3mm.

[0113] It should be understood that if n2 is too large, meaning there are too many welding teeth, the pressure on a single welding tooth may be insufficient, making it impossible to form an effective welding operation and affecting the overall welding quality. If n2 is too small, meaning there are too few welding teeth, the pressure on a single welding tooth may be too large, accelerating wear and affecting the service life of the welding tooth. To improve the aforementioned problems, n2 in the embodiments of this application satisfies the following range: 2pcs ≤ n2 ≤ 10pcs.

[0114] In one embodiment, n2 can be selected as 2pcs, 5pcs, or 10pcs.

[0115] Figure 6 A cross-sectional view of a welding head structure provided for another exemplary embodiment of this application. (See figure) Figure 6 As shown, along the second direction, the second intermediate region 310 includes at least two first welding teeth 340 of the same height, and the at least two first welding teeth 340 form a first welding tooth group 380.

[0116] In one embodiment, the two first welding teeth 340 in the same first welding tooth group 380 have the same height.

[0117] like Figure 6 As shown, along the second direction, both the third edge region 320 and the fourth edge region 330 include at least two second welding teeth 350 of the same height, and the at least two second welding teeth 350 form a second welding tooth group 390; that is, at least one second welding tooth group 390 is formed in the third edge region 320 and at least one second welding tooth group 390 is formed in the fourth edge region 330.

[0118] In one embodiment, the two second welding teeth 350 in the same second welding tooth group 390 have the same height.

[0119] like Figure 6 As shown, along the second direction, the second transition region 360 located between the third edge region 320 and the second intermediate region 310, and the second transition region 360 located between the fourth edge region 330 and the second intermediate region 310, both include at least two third welding teeth 370 of the same height, and the at least two third welding teeth 370 form a third welding tooth group 400; that is, there is at least one third welding tooth group 400 between the third edge region 320 and the second intermediate region 310, and there is at least one third welding tooth group 400 between the fourth edge region 330 and the second intermediate region 310.

[0120] In one embodiment, the two third welding teeth 370 in the same third welding tooth group 400 have the same height.

[0121] It should be noted that, along the direction from the second intermediate region 310 to the third edge region 320, the average height of the first welding tooth group 380, the third welding tooth group 400, and the second welding tooth group 390 gradually decrease. This ensures that during ultrasonic welding, the difference in average height between the welding tooth groups at different locations within the welding head does not increase significantly. This effectively mitigates the problem of deformation and deflection caused by tooth height variations at different parts of the welding head, improving the quality of ultrasonic welding and extending the service life of the welding head.

[0122] Similarly, along the direction from the second intermediate region 310 to the fourth edge region 330, the average height of the first welding tooth group 380, the average height of the third welding tooth group 400, and the average height of the second welding tooth group 390 gradually decrease. This ensures that during ultrasonic welding, the difference in average height between the welding tooth groups at different locations within the welding head does not increase significantly, effectively mitigating the problem of deformation and deflection caused by tooth height variations at different parts of the welding head, thus improving the quality of ultrasonic welding and extending the service life of the welding head.

[0123] It should be noted that, compared to Figure 5 The height of the welding teeth varies parabolically. Figure 6 In a structure where the height of the welding teeth varies in a stepped manner, the height of the welding teeth in the same region (e.g., the second intermediate region 310, the second transition region 360, the third edge region 320, and the fourth edge region 330) is the same, making the processing and manufacturing process more convenient.

[0124] It should be noted that if the average height of the first welding tooth group 380, the average height of the second welding tooth group 390, and / or the average height of the third welding tooth group 400 are too large or too small, it will cause an excessive difference in average height between adjacent welding tooth groups. This can easily lead to stress concentration in welding tooth groups with larger average heights and incomplete welding between welding tooth groups with smaller average heights and the weld groove group. To improve the aforementioned problems, in the embodiments of this application, the average height F of the first welding tooth group 380, the average height G of the second welding tooth group 390, and the average height J of the third welding tooth group 400 satisfy the following relationships: 1.8mm≤F≤2mm, 0.5mm≤G≤0.8mm, 1.2mm≤J≤1.5mm.

[0125] In one embodiment, the average height F can be selected as 1.8mm, 1.9mm, 2mm, etc.; the average height G can be selected as 0.5mm, 0.6mm, 0.8mm, etc.; and the average height J can be selected as 1.2mm, 1.4mm, 1.5mm, etc.

[0126] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0127] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0128] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0129] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0130] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, additions, and sub-combinations therein.

Claims

1. A battery, characterized by, include: Battery cell; The electrode tab is connected to the battery cell. The electrode tab is provided with at least one soldering unit (100). The soldering unit (100) has a first intermediate region (110) and a first edge region (120) and a second edge region (130) disposed on both sides of a first direction. The first intermediate region (110) includes at least one first soldering groove (140). The first edge region (120) and the second edge region (130) each include at least one second soldering groove (150). The depth of the first soldering groove (140) is greater than the depth of the second soldering groove (150).

2. The battery of claim 1, wherein, Along the first direction, the soldering unit (100) further includes a first transition region (160), a portion of which is located between the first intermediate region (110) and the first edge region (120), and another portion of which is located between the first intermediate region (110) and the second edge region (130). The first transition region (160) includes at least one third soldering groove (170), and the depth of the third soldering groove (170) is greater than the depth of the second soldering groove (150).

3. The battery of claim 2, wherein, Along the direction from the first intermediate region (110) to the first edge region (120), the depth of the first solder groove (140), the depth of the third solder groove (170), and the depth of the second solder groove (150) gradually decrease; along the direction from the first intermediate region (110) to the second edge region (130), the depth of the first solder groove (140), the depth of the third solder groove (170), and the depth of the second solder groove (150) gradually decrease.

4. The battery of claim 3, wherein, Along the first direction, the depths of the first solder groove (140), the second solder groove (150), and the third solder groove (170) in the same solder unit (100) satisfy a first preset parabolic equation. The first preset parabola equation satisfies: H1 = Ak1 * n1 2 + h1; Wherein, H1 represents the depth of the first solder groove (140) with the largest depth; h1 represents the depth of the second solder groove (150) with the smallest depth; n1 represents the total number of the first solder groove (140), the second solder groove (150) and the third solder groove (170) that exist between the first solder groove (140) with the largest depth and the second solder groove (150) with the smallest depth; △k1 represents the decreasing slope, which is a constant.

5. The battery of claim 4, wherein, H1 satisfies: 1.5mm≤H1≤2mm; h1 satisfies: 0.2mm≤h1≤0.3mm; n1 satisfies: 2pcs≤n1≤10pcs.

6. The battery of claim 2, wherein, Along the first direction, the first intermediate region (110) includes at least two first solder grooves (140) of the same depth, and the at least two first solder grooves (140) form a first solder groove group (180); the first edge region (120) and the second edge region (130) each include at least two second solder grooves (150) of the same depth, and the at least two second solder grooves (150) form a second solder groove group (190); the first transition region (160) located between the first edge region (120) and the first intermediate region (110) and the first transition region (160) located between the second edge region (130) and the first intermediate region (110) each include at least two third solder grooves (170) of the same depth, and the at least two third solder grooves (170) form a third solder groove group (200); Along the direction from the first intermediate region (110) to the first edge region (120), the average depth of the first solder groove group (180), the average depth of the third solder groove group (200), and the average depth of the second solder groove group (190) gradually decrease. Along the direction from the first intermediate region (110) to the second edge region (130), the average depth of the first solder groove group (180), the average depth of the third solder groove group (200), and the average depth of the second solder groove group (190) gradually decrease.

7. The battery of claim 6, wherein, The average depth of the first solder groove group (180) is C, the average depth of the second solder groove group (190) is D, and the average depth of the third solder groove group (200) is E. C, D and E respectively satisfy: 1.8mm≤C≤2mm, 0.5mm≤D≤0.8mm, 1.2mm≤E≤1.5mm.

8. A welding tip characterized by, include: At least one welding tooth unit (300) has a second intermediate region (310) and a third edge region (320) and a fourth edge region (330) disposed on both sides of a second direction. The second intermediate region (310) includes at least one first welding tooth (340), and the third edge region (320) and the fourth edge region (330) each include at least one second welding tooth (350). The height of the first welding tooth (340) is greater than the height of the second welding tooth (350).

9. The welding tip of claim 8, wherein, Along the second direction, the welding tooth unit (300) further includes a second transition region (360), a portion of which is located between the second intermediate region (310) and the third edge region (320), and another portion of which is located between the second intermediate region (310) and the fourth edge region (330). The second transition region (360) includes at least one third welding tooth (370), and the height of the third welding tooth (370) is greater than the height of the second welding tooth (350).

10. The welding tip of claim 9, wherein Along the direction from the second intermediate region (310) to the third edge region (320), the height of the first welding tooth (340), the height of the third welding tooth (370), and the height of the second welding tooth (350) gradually decrease; along the direction from the second intermediate region (310) to the fourth edge region (330), the height of the first welding tooth (340), the height of the third welding tooth (370), and the height of the second welding tooth (350) gradually decrease.

11. The welding tip of claim 10, wherein Along the second direction, the heights of the first welding tooth (340), the second welding tooth (350), and the third welding tooth (370) in the same welding tooth unit (300) satisfy a second preset parabolic equation; The second preset parabola equation satisfies: H2 = Ak2*n2 2 + h2; Wherein, H2 represents the height value of the first welding tooth (340) with the largest height; h2 represents the height value of the second welding tooth (350) with the smallest height; n2 represents the total number of the first welding tooth (340), the second welding tooth (350) and the third welding tooth (370) that exist between the first welding tooth (340) with the largest height and the second welding tooth (350) with the smallest height; △k2 represents the decreasing slope, which is a constant.

12. The welding tip of claim 11, wherein, H2 satisfies: 1.5mm≤H2≤2mm; h2 satisfies: 0.2mm≤h2≤0.3mm; n2 satisfies: 2pcs≤n2≤10pcs.

13. The welding tip of claim 9, wherein Along the second direction, the second intermediate region (310) includes at least two first welding teeth (340) of the same height, and the at least two first welding teeth (340) form a first welding tooth group (380); the third edge region (320) and the fourth edge region (330) each include at least two second welding teeth (350) of the same height, and the at least two second welding teeth (350) form a second welding tooth group (390); the second transition region (360) located between the third edge region (320) and the second intermediate region (310) and the second transition region (360) located between the fourth edge region (330) and the second intermediate region (310) each include at least two third welding teeth (370) of the same height, and the at least two third welding teeth (370) form a third welding tooth group (400); Along the direction from the second intermediate region (310) to the third edge region (320), the average height of the first welding tooth group (380), the average height of the third welding tooth group (400), and the average height of the second welding tooth group (390) gradually decrease; Along the direction from the second intermediate region (310) to the fourth edge region (330), the average height of the first welding tooth group (380), the average height of the third welding tooth group (400), and the average height of the second welding tooth group (390) gradually decrease.

14. The welding tip of claim 13, wherein The average depth of the first welding tooth group (380) is F, the average depth of the second welding tooth group (390) is G, and the average depth of the third welding tooth group (400) is J. F, G and J respectively satisfy: 1.8mm≤F≤2mm, 0.5mm≤G≤0.8mm, 1.2mm≤J≤1.5mm.

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