Welded part, battery, electric equipment and welding method

Abstract

The invention provides a welding part, a battery, electric equipment and a welding method. At least one welding wire is formed on the welding piece, the welding wire comprises at least one linear welding wire and at least one curved welding wire, and the linear welding wire and the curved welding wire are sequentially connected so that the welding wire can gradually extend in one direction; the welding part is used for being welded with a to-be-connected part, the weld penetration depth of the welding part of the welding part and the to-be-connected part is H1, the thickness of the welding part is H2, and H1 / H2 is larger than or equal to 1.1 and smaller than or equal to 3. According to the welding part, the length of the welding wire can be effectively increased, the welding stability and the welding quality of the welding part and other parts can be improved, the problem that accumulated heat at an intersection point is too high due to the fact that a single welding wire has the intersection point can be solved, and the welding stability and the welding quality are guaranteed. The connecting stability of the welding piece and the to-be-connected piece is guaranteed, meanwhile, the to-be-connected piece can be prevented from being welded through due to the fact that the weld penetration depth is too large, and the welding quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a welding piece, a battery, an electric device and a welding method. BACKGROUND

[0002] Batteries are widely used in energy storage systems, vehicles and consumer electronics, etc. A battery mainly includes a shell, a cover plate, a winding core, a positive busbar, a positive tab, a negative welding piece and a negative tab, etc.

[0003] The busbar (also known as a current collector), the shell, the cover plate and the tab may need to be welded to connect with other components. For example, the busbar may need to be welded with the tab, the busbar may need to be welded with the shell, the cover plate may need to be welded with the busbar, the cover plate may need to be welded with the shell, and the cover plate may need to be welded with the winding core.

[0004] The welding stability and the welding quality have an important influence on the performance of the battery. However, in the related art, the welding quality and the welding stability need to be improved. SUMMARY

[0005] Embodiments of the present application provide a welding piece, a battery, an electric device and a welding method, which can improve the welding quality and the welding stability and other technical problems.

[0006] In a first aspect, embodiments of the present application provide a welding piece, the welding piece is formed with at least one welding line, the welding line includes at least one straight line welding line and at least one curved line welding line, the straight line welding line and the curved line welding line are connected in sequence, so that the welding line gradually extends along one direction; The welding piece is used for welding with a to-be-connected piece, the weld penetration at the welding position of the welding piece and the to-be-connected piece is H1, and the thickness of the welding piece is H2, where 1.1≤H1 / H2≤3.

[0007] In an embodiment, the welding piece includes a positive busbar, where 1.1≤H1 / H2≤2.5; or, The welding piece includes a negative busbar, where 1.2≤H1 / H2≤3.

[0008] By adopting the above technical solution, the connection stability of the positive busbar and the to-be-connected piece is ensured, and at the same time, the welding quality is ensured by avoiding the weld penetration being too deep to weld through the to-be-connected piece. The connection stability of the negative busbar and the to-be-connected piece is ensured, and at the same time, the welding quality is ensured by avoiding the weld penetration being too deep to weld through the to-be-connected piece.

[0009] In an embodiment, the plurality of straight line welding lines and the plurality of curved line welding lines are connected in sequence and alternately.

[0010] By adopting the technical scheme, the length of a single welding wire can be effectively prolonged, and the number of welding wires can be reduced.

[0011] In an embodiment, the welding piece is formed with a welding wire group, and the welding wire group comprises at least two welding wires intersecting with each other.

[0012] By adopting the technical scheme, at least two welding wires intersect with each other to form a welding wire group, so that the welding density in a region can be effectively improved, and the stability of the welding connection between the welding piece and the tab is ensured.

[0013] In an embodiment, the welding wire group comprises an intersection position and a non-intersection position, the weld penetration at the intersection position is h1, and the weld penetration at the non-intersection position is h2, wherein h1-h2≤0.15mm.

[0014] By adopting the technical scheme, the situation that the weld penetration at the intersection position is too deep can be prevented, and the welding quality is ensured.

[0015] In an embodiment, h1-h2≤0.08mm; and / or, 0.05mm≤h1≤0.3mm.

[0016] By adopting the technical scheme, the difference between the weld penetration at the intersection position and the weld penetration at the non-intersection position is controlled within 0.08mm, so that the situation that the weld penetration at the intersection position is too deep can be prevented, and the welding quality is ensured. The weld penetration at the intersection position is designed to be between 0.05mm and 0.3mm, and the welding quality is ensured.

[0017] In an embodiment, the intersection point of the two welding wires of the welding wire group is located on the curved welding wire, the distance between the intersection point and the midpoint of the curved welding wire is y1, and the total length of the curved welding wire is y2, wherein y1 / y2≤1 / 6.

[0018] By adopting the technical scheme, the welding density of the welding wire group can be improved, and the stability of the welding connection can be improved.

[0019] In an embodiment, the number of the welding wires is at least two, and the at least two welding wires comprise a first welding wire and a second welding wire, and the first welding wire and the second welding wire are mirror images of each other.

[0020] By adopting the technical scheme, the welding density can be increased without swing welding, the connection stability of the welding piece and the tab is ensured, and the problems of large heat input difference in the wave peak and wave valley regions caused by swing welding and the problem of short distance between adjacent welding wires can be avoided.

[0021] In an embodiment, the number of the wire groups is at least two, wherein, The at least two wire groups are distributed along a circumferential direction of the welding member; and / or, The at least two wire groups are distributed along a radial direction of the welding member.

[0022] By adopting the technical scheme, the welding position of the bus bar and the tab can be increased, the welding area of the welding member and the tab can be increased, and the connection stability of the bus bar and the tab can be ensured.

[0023] In an embodiment, the welding member is formed with at least two wire regions, and the wire regions include the at least two wire groups, wherein, The at least two wire regions are uniformly distributed along a circumferential direction of the welding member; and / or, The at least two wire regions are uniformly distributed along a radial direction of the welding member.

[0024] By adopting the technical scheme, the at least two wire groups are a welding unit, and after the welding member and the tab are welded, at least two welding units are formed, the welding position of the bus bar and the tab can be effectively increased, the welding area of the welding member and the tab can be increased, and the connection stability of the bus bar and the tab can be ensured.

[0025] In an embodiment, in the same wire, the straight wire is tangent to the adjacent curved wire.

[0026] By adopting the technical scheme, the smooth transition between the straight wire and the curved wire can be ensured.

[0027] In an embodiment, the number of the wires is at least two, wherein, The at least two wires are distributed along a circumferential direction of the welding member; and / or, The at least two wires are distributed along a radial direction of the welding member.

[0028] By adopting the technical scheme, the welding position of the bus bar and the tab can be increased, the welding area of the welding member and the tab can be increased, and the connection stability of the bus bar and the tab can be ensured.

[0029] In an embodiment, the welding member is formed with at least two wire regions, and the wire regions include the at least two wires, wherein, The at least two wire regions are uniformly distributed along a circumferential direction of the welding member; and / or, The at least two wire regions are uniformly distributed along a radial direction of the welding member.

[0030] By adopting the technical scheme, at least two welding wires are a welding unit, at least two welding units are formed after the welding piece and the tab are welded, the welding position of the bus bar and the tab is effectively increased, the welding area of the welding piece and the tab is increased, and the connection stability of the bus bar and the tab is ensured.

[0031] In an embodiment, the welding piece has a square region, and the welding wires are located in the square region. The square region includes two oppositely arranged first edges and two oppositely arranged second edges. The curved welding wire includes at least two arc-shaped welding wires, adjacent two arc-shaped welding wires are connected by a straight line welding wire, and the convex directions of adjacent two arc-shaped welding wires are opposite.

[0032] By adopting the technical scheme, the welding wires are all located in a square region, and the regularity of the overall shape of the welding wires is ensured.

[0033] In an embodiment, one of the first edges is tangent to one of the arc-shaped welding wires, the other first edge is tangent to the other arc-shaped welding wire, the end point of the first end of the welding wire is located on one of the second edges, and the end point of the second end of the welding wire is located on the other second edge.

[0034] By adopting the technical scheme, the welding wires are all located in a square region, the regularity of the overall shape of the welding wires is ensured, and the arrangement design of the welding wires is facilitated.

[0035] In an embodiment, the number of the straight line welding wires is at least two, the curved welding wire connects adjacent two straight line welding wires, and different straight line welding wires are parallel to each other.

[0036] By adopting the technical scheme, the welding speed at different straight line welding wires is kept consistent, the welding is stably controlled, and the welding difficulty is reduced.

[0037] In an embodiment, the number of the straight line welding wires is n, n straight line welding wires are sequentially distributed along the extension direction of the first edge, and the mth straight line welding wire and the m+2th straight line welding wire are parallel to each other, where n≥3, n-2≥m≥1.

[0038] By adopting the technical scheme, the welding wires as a whole have a shape similar to a sine wave, the consistency of the angular velocity and the welding speed value of each point of the welding wires is improved, the stable formation of a welding pool and the stable control of welding are facilitated.

[0039] In an embodiment, the length of the first edge along the extension direction of the first edge is A; the length of the second edge along the extension direction of the second edge is B; the length of the straight line along the extension direction of the straight line is L; the angle between the straight line and the second edge is θ; the radius of the arc-shaped soldering line is r, the chord length of the arc-shaped soldering line is X, and C is the shortest distance between the midpoints of two adjacent straight lines, wherein, X=C-L*sinθ; and / or, r=(C-L*sinθ) / 2*cosθ; and / or, B=L*cosθ+C-((C-L*sinθ) / cosθ)*(1-sinθ); and / or, A=n*L*sinθ+(n-1)*(C-L*sinθ), n is the number of the straight lines.

[0040] By adopting the technical scheme, the straight line and the arc-shaped soldering line are tangent, the smooth transition between the straight line and the arc-shaped soldering line is ensured, and the welding effect of the busbar and the tab is ensured.

[0041] In an embodiment, the center of the welding piece is located on the extension line of the line connecting the midpoints of different straight lines on the same soldering line.

[0042] By adopting the technical scheme, the extension direction of the soldering line is located on the diameter of the busbar, and the welding length of the welding piece and the tab in the radial direction is ensured.

[0043] In an embodiment, the soldering line includes a plurality of straight lines, and the plurality of straight lines are distributed in a fan shape or a ring shape.

[0044] By adopting the technical scheme, the soldering line is located in a fan-shaped area or a ring-shaped area, the overall shape of the soldering line is more suitable for the shape of the welding piece, and the arrangement design of the soldering line is facilitated.

[0045] In an embodiment, the first end of different straight lines is located on a first circle with a radius of R1, the second end of different straight lines is located on a second circle with a radius of R2, and the angle between adjacent two straight lines is α. The curved soldering line includes a circular arc soldering line, the number of the circular arc soldering line is at least two, the at least two circular arc soldering lines include a first circular arc soldering line and a second circular arc soldering line, the straight line connects the first circular arc soldering line and the second circular arc soldering line, both ends of the first circular arc soldering line are located on the first circle, both ends of the second circular arc soldering line are located on the second circle, the radius of the first circular arc soldering line is r2, and the radius of the second circular arc soldering line is r1, wherein, The length of the straight wire is R2-R1; and / or, The width of the wire along the radial direction of the first circle is R2-R1+r1+r2; and / or, The length of the wire is n*(R2-R1)+π*r1*k1+π*r2*k2, n is the number of the straight wire, k1 is the number of the first circular arc wire, and k2 is the number of the second circular arc wire; and / or, The central angle of the wire is δ, and δ≥10°.

[0046] By adopting the above technical solution, the width of the wire can be prevented from being too small, the length of the wire can be prevented from being too small, the coverage angle of the wire is ensured, and the welding effect of the busbar and the tab is ensured.

[0047] In an embodiment, the wire is a one-time formed continuous wire.

[0048] By adopting the above technical solution, a single wire is formed by continuous welding, rather than being formed by two or more times of welding and splicing, so that heat accumulation can be prevented during the formation of a single wire.

[0049] In an embodiment, the number of the curved wires is at least two, and two adjacent curved wires are connected by a straight wire, wherein the distance between the midpoints of different adjacent curved wires along the radial direction of the welding piece is the same.

[0050] By adopting the above technical solution, the uniformity of the structure of the wire is ensured, and the uniformity of the distribution of the wire density is ensured, so that the welding effect at different positions remains the same.

[0051] In an embodiment, along the radial direction of the welding piece, the length of the wire is x, and the shortest distance between the wire and the outer edge of the welding piece is x1, wherein, The shortest distance between the wire and the center of the welding piece along the radial direction of the welding piece is x2, and x≥x1+x2; or, The welding piece has a center hole, and the shortest distance between the wire and the inner edge of the welding piece along the radial direction of the welding piece is x3, and x≥x1+x3.

[0052] By adopting the above technical solution, the coverage length and coverage area of the wire in the radial direction are ensured, and the welding quality is ensured.

[0053] In an embodiment, the welding wire comprises a first welding wire part, a main body part and a second welding wire part connected in sequence, and the first welding wire part, the main body part and the second welding wire part are distributed in sequence along the radial direction of the welding piece away from the center of the welding piece. The total length of the first welding wire part is greater than the total length of the second welding wire part.

[0054] By adopting the above technical solution, the welding length at the center area of the welding piece is ensured, the welding connection stability at the center area of the welding piece is improved, and the overall connection stability of the welding piece and the to-be-connected piece is improved.

[0055] In a second aspect, the embodiments of the present application provide a battery comprising the welding piece.

[0056] In an embodiment, the battery comprises a to-be-connected piece, the to-be-connected piece comprises a tab, the welding piece is welded with the tab, and the weld penetration at the tab is H3, wherein 0.1≤H3 / H2≤2.

[0057] By adopting the above technical solution, the connection stability of the welding piece and the tab is ensured, and the welding quality is ensured by avoiding the weld penetration being too deep to weld through the to-be-connected piece.

[0058] In an embodiment, the welding piece comprises a positive busbar, wherein 0.1≤H3 / H2≤1.25; or, The welding piece comprises a negative busbar, wherein 0.2≤H3 / H2≤2.

[0059] By adopting the above technical solution, the connection stability of the positive busbar and the tab is ensured, and the welding quality is ensured by avoiding the weld penetration being too deep to weld through the tab. The connection stability of the negative busbar and the tab is ensured, and the welding quality is ensured by avoiding the weld penetration being too deep to weld through the tab.

[0060] In a third aspect, the embodiments of the present application provide a power utilization device comprising the battery.

[0061] In a fourth aspect, the embodiments of the present application provide a welding method applied to the welding piece, the welding piece (10) is formed with a welding wire group (12), the welding wire group (12) comprises at least a first welding wire and a second welding wire, the first welding wire and the second welding wire intersect with each other, and the number of the welding wire group (12) is at least two; the welding method comprises: sequentially welding the first welding wire to form different welding wire groups (12); sequentially welding the second welding wire to form different welding wire groups (12).

[0062] In a fourth aspect, the embodiments of the present application provide a welding method applied to the welding piece as described above, the number of the welding lines (11) is at least two, the at least two welding lines (11) include a first welding line (113) and a second welding line (114), the first welding line and the second welding line intersect with each other; the welding method includes: welding to form the first welding line; welding to form the second welding line, wherein the time points of forming the first welding line and the second welding line are spaced apart by 0.1 seconds to 1 second.

[0063] In an embodiment, the time points of forming the first welding line and the second welding line are spaced apart by 0.2 seconds.

[0064] By adopting the above technical solution, the situation that the heat is accumulated too high at the intersection of the first welding line and the second welding line can be avoided, and the welding quality is ensured.

[0065] The beneficial effects of the embodiments of the present application are: In the embodiments of the present application, the welding line at the welding piece is designed to be composed of straight welding lines and curved welding lines, which can effectively increase the length of the welding line, and is beneficial to improve the welding stability and welding quality of the welding piece and other components. And the welding line gradually extends along one direction, so that there is no intersection point in the same welding line, which can avoid the problem that the heat is accumulated too high at the intersection point due to the intersection point of the single welding line, and ensure the welding stability and welding quality.

[0066] And the ratio of the weld penetration depth to the thickness of the welding piece is set to be between 1.1 and 3, which ensures the connection stability of the welding piece and the to-be-connected piece, and also avoids the problem that the weld penetration depth is too deep to weld through the to-be-connected piece, and ensures the welding quality. BRIEF DESCRIPTION OF DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0068] Figure 1 is a structural schematic diagram of a welding piece provided by the embodiments of the present application; Figure 2 is a structural schematic diagram of a welding line provided by the embodiments of the present application; Figure 3 is a structural schematic diagram of a welding line group provided by the embodiments of the present application, wherein the welding line group includes Figure 2 the welding line shown in the figure; Figure 4This is a schematic diagram illustrating the bonding wires provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the bonding wire provided in an embodiment of this application, wherein the angle between the straight bonding wire and the second side is 0°; Figure 6 This is a schematic diagram of the structure of the wire bonding assembly provided in an embodiment of this application, wherein the wire bonding assembly includes... Figure 5 The solder wires shown; Figure 7 This is a schematic diagram of the structure of a welded component provided in an embodiment of this application, wherein multiple groups of weld wires are spaced apart; Figure 8 This is a schematic diagram of the structure of the welded component provided in an embodiment of this application, wherein the weld wire area includes 3 weld wire groups; Figure 9 This is a schematic diagram of the structure of a welded component provided in an embodiment of this application, wherein the weld lines in the figure are... Figure 6 The solder wires shown; Figure 10 This is a schematic diagram of another shape of the bonding wire provided in an embodiment of this application; Figure 11 This is a schematic diagram of the wire bonding distribution provided in an embodiment of this application; Figure 12 This is one of the schematic diagrams of wire bonding group distribution provided in the embodiments of this application; Figure 13 This is a second schematic diagram of the wire bonding group distribution provided in the embodiments of this application; Figure 14 This is a schematic diagram of the welding of the welded part and the electrode tab provided in the embodiments of this application.

[0069] Explanation of reference numerals in the attached figures: 10. Welded component; 11. Weld wire; 12. Weld wire group; 13. Square area; 20. Electrode; 111. Straight weld wire; 112. Curved weld wire; 113. First weld wire; 114. Second weld wire; 131. First side; 132. Second side; 1121. Arc weld wire; 1122. Circular arc weld wire; 1123. First circular arc weld wire; 1124. Second circular arc weld wire. Detailed Implementation

[0070] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0071] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device. Figures 1 to 14 The welding piece, the battery, the electric device and the welding method are described.

[0072] According to the embodiments of the first aspect of the present application, as shown in Figure 1 、 Figure 2 and Figure 5 , the welding piece 10 is formed with at least one welding line 11, the welding line 11 includes at least one straight welding line 111 and at least one curved welding line 112, the straight welding line 111 and the curved welding line 112 are connected in sequence, so that the welding line 11 gradually extends along one direction; the welding piece 10 is used for welding with a to-be-connected piece, the weld penetration of the welding position of the welding piece 10 and the to-be-connected piece is H1, and the thickness of the welding piece is H2, wherein 1.1≤H1 / H2≤3.

[0073] According to the welding piece 10 of the embodiments of the present application, when the welding piece 10 is welded and connected with other components, the welding piece 10 will form a welding line 11, the welding line 11 at the welding piece 10 is designed to be composed of a straight welding line 111 and a curved welding line 112, which can effectively increase the length of the welding line 11, and is beneficial to improve the welding stability and welding quality of the welding piece 10 and other components. And the welding line 11 gradually extends along one direction, so that there is no intersection point in the same welding line 11, which can avoid the problem of excessive heat accumulation at the intersection point due to the intersection point of the single welding line 11, and ensure the welding stability and welding quality.

[0074] And the ratio of the weld penetration of the welding position to the thickness of the welding piece 10 is set to be between 1.1 and 3, which ensures the connection stability of the welding piece 10 and the to-be-connected piece, and also avoids the problem of welding through the to-be-connected piece due to excessive weld penetration, and ensures the welding quality.

[0075] It can be understood that the welding wire 11 of the present application includes a straight welding wire 111 and a curved welding wire 112 connected in sequence, that is, when welding the welding member 10 and the tab, the welding equipment only needs to move gradually along the extension direction of the welding wire 11, which can keep the welding speed of the welding wire 11 consistent everywhere, without swing welding, and there is no problem of speed difference of a single welding wire 11, the consistency of the welding pool shape is high, the welding control is convenient, the control redundancy is increased, and the mass production feasibility is greatly improved.

[0076] It can be understood that if the ratio of the weld penetration at the welding position to the thickness of the welding member 10 is less than 1.1, it indicates that the weld penetration is shallow, and the connection stability between the welding member 10 and the to-be-connected member is insufficient; if the ratio of the weld penetration at the welding position to the thickness of the welding member 10 is greater than 3, the weld penetration may penetrate the to-be-connected member, affecting the welding quality. Therefore, the ratio of the weld penetration at the welding position to the thickness of the welding member 10 is set to be between 1.1 and 3 in the embodiment.

[0077] In some examples, the welding member 10 and the to-be-connected member are connected by penetration welding. The weld penetration at the welding position refers to the depth of the molten pool at the welding position of the welding member 10 and the to-be-connected member.

[0078] In some examples, the weld penetration refers to the depth of the molten pool at the welding position of the welding member 10 and the to-be-connected member along the axial direction of the welding member 10.

[0079] It should be noted that in the related art, the welding wire 11 of the welding member 10 mostly has intersection points, and a large amount of heat is easily accumulated at the intersection points, which in turn easily causes damage to the separator of the battery, affecting the welding stability and welding quality. The welding wire 11 of the present application is formed by the straight welding wire 111 and the curved welding wire 112 connected in sequence, and there is no intersection point in a single welding wire 11, which can effectively avoid the heat accumulation at some positions to be too high to cause damage to the separator of the battery, ensuring the welding stability and welding quality, and improving the safety of the battery.

[0080] In the related art, when the straight welding wire 111 is used, in order to ensure the connection stability of the welding member 10 and the tab, the number of the straight welding wire 111 is relatively large. When each straight welding wire 111 is formed, starting welding and welding ending need to be performed. This results in that starting welding and welding ending need to be frequently performed when welding the welding member 10 and the tab, causing the molten pool to be unstable. The welding wire 11 of the present application is composed of the straight welding wire 111 and the curved welding wire 112, which effectively increases the length of the welding wire 11, can reduce the number of the welding wire 11, and in turn can reduce the number of starting welding and welding ending, which is beneficial to improve the stability of the molten pool.

[0081] In some examples, the welding piece 10 is a cover plate, and the piece to be connected is a busbar, and the cover plate is used for welding with the busbar. In this way, the application can avoid the problem of excessive heat accumulation at the intersection point due to the intersection of a single welding wire 11, and can effectively avoid the heat accumulation at some positions being too high to damage the structure of the busbar, thereby ensuring the welding stability and welding quality.

[0082] In some examples, the welding piece 10 is a cover plate, and the piece to be connected is a busbar, and the cover plate is used for welding with the busbar. In this way, the application can avoid the problem of excessive heat accumulation at the intersection point due to the intersection of a single welding wire 11, and can effectively avoid the heat accumulation at some positions being too high to damage the structure of the busbar, thereby ensuring the welding stability and welding quality.

[0083] It should be noted that the weld penetration refers to the depth of the weld formed by welding, and can also be understood as the distance from the surface of the workpiece to the bottom of the molten pool.

[0084] In some embodiments, the welding piece includes a positive busbar, and 1.1≤H1 / H2≤2.5.

[0085] It can be understood that if the ratio of the weld penetration at the welding position of the positive busbar and the thickness of the positive busbar is less than 1.1, it means that the weld penetration is shallow, and the connection stability between the positive busbar and the piece to be connected is insufficient. If the ratio of the weld penetration at the welding position and the thickness of the positive busbar is greater than 2.5, the weld may penetrate the piece to be connected, affecting the welding quality. Therefore, the ratio of the weld penetration at the welding position and the thickness of the positive busbar is set to be between 1.1 and 2.5 in this embodiment, which ensures the connection stability of the positive busbar and the piece to be connected, and also avoids the weld penetration being too deep to penetrate the piece to be connected, thereby ensuring the welding quality.

[0086] In some embodiments, the welding piece includes a negative busbar, and 1.2≤H1 / H2≤3.

[0087] It can be understood that if the ratio of the weld penetration at the welding position of the negative busbar and the thickness of the negative busbar is less than 1.2, it means that the weld penetration is shallow, and the connection stability between the negative busbar and the piece to be connected is insufficient. If the ratio of the weld penetration at the welding position and the thickness of the negative busbar is greater than 3, the weld may penetrate the piece to be connected, affecting the welding quality. Therefore, the ratio of the weld penetration at the welding position and the thickness of the negative busbar is set to be between 1.2 and 3 in this embodiment, which ensures the connection stability of the negative busbar and the piece to be connected, and also avoids the weld penetration being too deep to penetrate the piece to be connected, thereby ensuring the welding quality.

[0088] In some embodiments, as Figure 2 and Figure 3As shown, the plurality of straight welding wires 111 and the plurality of curved welding wires 112 are alternately connected in sequence.

[0089] In this way, the length of a single welding wire 11 can be effectively extended, and the number of welding wires 11 can be reduced.

[0090] In some embodiments, as shown in Figure 3 and Figure 6 As shown, the number of welding wires 11 is at least two, and the welding member 10 is formed with a welding wire group 12, which includes at least two welding wires 11 that intersect each other.

[0091] In this way, the at least two welding wires 11 intersect each other to form the welding wire group 12, which can effectively improve the welding density in a region and ensure the stability of the welding connection between the welding member 10 and other components.

[0092] It can be understood that, assuming that the welding wire group 12 includes two welding wires 11. When welding the welding member 10 and the tab, one of the welding wires 11 is first formed by welding, and then the other welding wire 11 is formed by welding, and the two welding wires 11 intersect each other, that is, the two welding wires 11 of the same welding wire group 12 are formed at different time points, that is, the first welding wire is formed first, and then the second welding wire is formed after a certain time interval. Even if there is a crossing point in the same welding wire group 12, because it is not a crossing point formed by the same welding wire 11, but a crossing point formed between different welding wires 11, there will be no case of excessive heat accumulation at the crossing point. In this way, the welding density in a region can be increased, and there will be no case of excessive heat accumulation at some positions.

[0093] It can be understood that, since the two welding wires 11 of the same welding wire group 12 are formed at a certain time interval, when the second welding wire is formed, there is basically no residual heat or low residual heat at the first welding wire, which will not cause the crossing point to have excessive heat accumulation.

[0094] It should be noted that the welding wire group 12 can be arbitrarily combined according to requirements, and the form is flexible and variable, and is suitable for batteries of various sizes.

[0095] In some embodiments, the welding wire group includes a crossing position and a non-crossing position, the weld penetration depth at the crossing position is h1, and the weld penetration depth at the non-crossing position is h2, h1-h2≤0.15mm.

[0096] In this way, the case of excessive weld depth at the crossing position can be prevented, and the welding quality can be ensured.

[0097] It should be noted that the crossing position refers to the intersection point of two or more welding wires.

[0098] Specifically, h1-h2≤0.08mm.

[0099] It can be understood that the difference between the weld penetration at the intersection position and the weld penetration at the non-intersection position is controlled within 0.08 mm, thereby preventing the weld penetration at the intersection position from being too deep and ensuring the welding quality.

[0100] Specifically, 0.05 mm≤h1≤0.3 mm.

[0101] It can be understood that if the weld penetration at the intersection position is less than 0.05 mm, it indicates that the weld penetration at the intersection position is insufficient, and the welding quality is poor; if the weld penetration at the intersection position is greater than 0.3 mm, it indicates that the weld penetration at the intersection position is too deep, and the welding quality is poor. Therefore, the weld penetration at the intersection position is designed to be between 0.05 mm and 0.3 mm in the embodiment, thereby ensuring the welding quality.

[0102] In some embodiments, the intersection of the two welding lines of the welding line group is located at the curved welding line, the distance between the intersection and the midpoint of the curved welding line is y1, and the total length of the curved welding line is y2, where y1 / y2≤1 / 6.

[0103] In this way, the welding density of the welding line group is improved, thereby improving the stability of the welding connection.

[0104] Preferably, the intersection is located at the midpoint of the curved welding line.

[0105] In some examples, the distance between the intersection and the midpoint of the curved welding line refers to the length of the curved segment between the intersection and the midpoint of the curved welding line after being straightened; the total length of the curved welding line refers to the total length of the curved welding line after being straightened. The distance between the intersection and the midpoint of the curved welding line can also refer to the length of the intersection to the midpoint of the curved welding line along the radial direction of the welding piece; the total length of the curved welding line can also refer to the total length of the curved welding line along the radial direction of the welding piece.

[0106] In some embodiments, as shown in FIG. 1, the number of welding lines 11 is at least two, the at least two welding lines 11 include a first welding line 113 and a second welding line 114, and the first welding line 113 and the second welding line 114 are mirror images of each other. Figure 3

[0107] In this way, the welding line 11 density can be increased without swing welding, thereby ensuring the connection stability of the welding piece 10 and the tab, and avoiding the problems of large heat input difference in the wave peak and wave valley regions caused by swing welding and the problem of close distance between adjacent welding lines 11.

[0108] ​It can be understood that the welding wire 11 of the present application does not need to be swing welded when formed, and the angular velocity and welding speed values of each point of the welding wire 11 can be kept consistent, which is beneficial to the stable formation of the welding pool and the stable control of welding, widens the process window of the welding of the current collector and the tab, improves the welding redundancy, improves the safety of the battery, and is more convenient for the control of the consistency of the penetration and width of the molten pool and the avoidance of damage to the separator and the electrode active material during welding in large quantities.

[0109] In some embodiments, as shown in Figure 7 , Figure 9 , Figure 11 , Figure 12 and Figure 13 , the number of the welding wire groups 12 is at least two.

[0110] Specifically, the at least two welding wire groups 12 are distributed along the circumference of the welding member 10.

[0111] In this way, the welding position of the welding member and other components can be increased, and the welding area of the welding member 10 and the tab can be increased, thereby ensuring the connection stability of the bus bar and the tab.

[0112] Specifically, the at least two welding wire groups 12 are distributed along the radial direction of the welding member 10.

[0113] In this way, the welding position of the welding member and other components can be increased, and the welding area of the welding member 10 and the tab can be increased, thereby ensuring the connection stability of the bus bar and the tab.

[0114] In some embodiments, as shown in Figure 8 , the welding member 10 is formed with at least two welding wire regions, and each welding wire region includes at least two welding wire groups 12.

[0115] Specifically, the at least two welding wire regions are uniformly distributed along the circumference of the welding member 10.

[0116] In this way, the at least two welding wire groups 12 form one welding unit, and after the welding member 10 is welded with the tab, at least two welding units are formed, which effectively increases the welding position of the bus bar and the tab, increases the welding area of the welding member 10 and the tab, and ensures the connection stability of the bus bar and the tab.

[0117] Specifically, the at least two welding wire regions are uniformly distributed along the radial direction of the welding member 10.

[0118] In this way, the at least two welding wire groups 12 form one welding unit, and after the welding member 10 is welded with the tab, at least two welding units are formed, which effectively increases the welding position of the bus bar and the tab, increases the welding area of the welding member 10 and the tab, and ensures the connection stability of the bus bar and the tab.

[0119] In some embodiments, as shown inFigure 2 , Figure 5 and Figure 10 As shown, in the same weld line 11, the straight weld line 111 is tangent to the adjacent curved weld line 112.

[0120] This ensures a smooth transition between the straight solder line 111 and the curved solder line 112.

[0121] Understandably, the smooth transition between the straight weld line 111 and the curved weld line 112 helps to ensure that the welding speed does not fluctuate too much at the junction of the straight weld line 111 and the curved weld line 112 when welding to form the weld line 11, which is conducive to the stable formation of the weld pool.

[0122] In some embodiments, such as Figure 7 , Figure 9 , Figure 11 , Figure 12 and Figure 13 As shown, the number of bonding wires 11 is at least two.

[0123] Specifically, at least two weld lines 11 are distributed at circumferential intervals along the weldment 10.

[0124] This increases the number of welding positions between the busbar and the tab, improves the welding area between the welded part 10 and the tab, and ensures the connection stability between the busbar and the tab.

[0125] Specifically, at least two weld lines 11 are distributed at radial intervals along the weldment 10.

[0126] This increases the number of welding positions between the busbar and the tab, improves the welding area between the welded part 10 and the tab, and ensures the connection stability between the busbar and the tab.

[0127] In some embodiments, such as Figure 7 , Figure 9 , Figure 11 , Figure 12 and Figure 13 As shown, the welded component 10 has at least two weld line areas, each weld line area including at least two weld lines 11.

[0128] Specifically, at least two weld lines are evenly distributed along the circumference of the weldment 10.

[0129] In this way, at least two welding lines 11 form a welding unit. After welding the welding part 10 to the electrode, at least two welding units will be formed, which effectively increases the welding position between the busbar and the electrode, increases the welding area between the welding part 10 and the electrode, and ensures the connection stability between the busbar and the electrode.

[0130] Specifically, at least two weld lines are evenly distributed along the radial direction of the weldment 10.

[0131] Thus, the at least two welding lines 11 are a welding unit, and after the welding member 10 is welded with the tab, at least two welding units are formed, the welding position of the bus bar and the tab is effectively increased, the welding area of the welding member 10 and the tab is increased, and the connection stability of the bus bar and the tab is ensured.

[0132] In some embodiments, as shown in Figure 4 The welding member 10 has a square area 13, and the welding line 11 is located in the square area 13. The square area 13 includes two oppositely arranged first edges 131 and two oppositely arranged second edges 132. The curved welding line 112 includes at least two arc-shaped welding lines 1121, and adjacent two arc-shaped welding lines 1121 are connected by a straight welding line 111, and the convex directions of the adjacent two arc-shaped welding lines 1121 are opposite.

[0133] Thus, the welding line 11 is located in a square area 13, and the regularity of the overall shape of the welding line 11 is ensured.

[0134] Specifically, one of the first edges 131 is tangent to one of the adjacent two arc-shaped welding lines 1121, the other first edge 131 is tangent to the other arc-shaped welding line 1121, the end point of the first end of the welding line 11 is located on one of the second edges 132, and the end point of the second end of the welding line 11 is located on the other second edge 132.

[0135] Thus, the welding line 11 is located in a square area 13, and the regularity of the overall shape of the welding line 11 is ensured, which is convenient for the arrangement design of the welding line 11.

[0136] It should be noted that the square area 13 is a virtual concept for understanding.

[0137] It should be noted that the end point of the first end of the welding line 11 is located on one of the second edges 132, which means that the end point of the first end of the welding line 11 is a point of one of the second edges 132. It can also be understood that the end point of the first end of the welding line 11 coincides with one of the second edges 132.

[0138] The end point of the second end of the welding line 11 is located on the other second edge 132, which means that the end point of the second end of the welding line 11 is a point of the other second edge 132. It can also be understood that the end point of the second end of the welding line 11 coincides with the other second edge 132.

[0139] Specifically, the number of the straight welding lines 111 is at least two, the curved welding line 112 connects adjacent two straight welding lines 111, and different straight welding lines 111 are parallel to each other.

[0140] In this way, the welding speed at different straight welding lines 111 is consistent, the welding is stably controlled, and the welding difficulty is reduced.

[0141] Specifically, the number of straight welding lines 111 is n, the n straight welding lines 111 are sequentially distributed along the extension direction of the first edge 131, and the mth straight welding line 111 is parallel to the m+2th straight welding line 111, where n≥3, n-2≥m≥1.

[0142] It can be understood that the first straight welding line 111 and the third straight welding line 111 are parallel to each other, the second straight welding line 111 and the fourth straight welding line 111 are parallel to each other, and so on, so that the entire welding line 11 is similar to a sine wave shape, which is beneficial to improve the consistency of the angular velocity and the welding speed of each point of the welding line 11, and is beneficial to the stable formation of the weld pool and the stable control of the welding.

[0143] In some embodiments, as shown in Figure 4 along the extension direction of the first edge 131, the length of the first edge 131 is A; along the extension direction of the second edge 132, the length of the second edge 132 is B; along the extension direction of the straight welding line 111, the length of the straight line is L; the included angle between the straight welding line 111 and the second edge 132 is θ; the radius of the arc-shaped welding line 1121 is r, the chord length of the arc-shaped welding line 1121 is X, and C is the shortest distance between the midpoints of two adjacent straight welding lines 111.

[0144] Specifically, X=C-L*sinθ.

[0145] In this way, the straight welding line 111 and the arc-shaped welding line 1121 are tangent to each other, and the smooth transition between the straight welding line 111 and the arc-shaped welding line 1121 is ensured.

[0146] It can be understood that the smooth transition between the straight welding line 111 and the arc-shaped welding line 1121 is beneficial to ensure that there is no excessive welding speed fluctuation at the junction of the straight welding line 111 and the arc-shaped welding line 1121 when the welding line 11 is formed, and is beneficial to the stable formation of the weld pool.

[0147] Specifically, r=(C-L*sinθ) / 2*cosθ.

[0148] In this way, the straight welding line 111 and the arc-shaped welding line 1121 are tangent to each other, and the smooth transition between the straight welding line 111 and the arc-shaped welding line 1121 is ensured.

[0149] It can be understood that the smooth transition between the straight wire 111 and the arc-shaped wire 1121 is beneficial to ensure that there is no excessive welding speed fluctuation at the junction of the straight wire 111 and the arc-shaped wire 1121 when the wire 11 is welded, and is beneficial to the stable formation of the weld pool.

[0150] Specifically, B = L*cosθ+C-((C-L*sinθ) / cosθ)*(1-sinθ).

[0151] In this way, the width of the wire 11 can be prevented from being too small, and the welding effect of the welding piece 10 and the tab is ensured.

[0152] Specifically, A = n*L*sinθ+(n-1)*(C-L*sinθ), n is the number of the straight wires 111.

[0153] In this way, the length of the wire 11 can be prevented from being too small, and the welding effect of the welding piece 10 and the tab is ensured.

[0154] In some embodiments, as shown in Figure 7 , Figure 8 and Figure 9 , the center of the welding piece 10 is located on the extension line of the connecting line of the midpoints of different straight wires 111 on the same wire 11.

[0155] In this way, the extension direction of the wire 11 is located on the diameter of the bus bar, and the welding length of the welding piece 10 and the tab in the radial direction is ensured.

[0156] In some embodiments, as shown in Figure 10 , the wire 11 includes a plurality of straight wires 111, and the plurality of straight wires 111 are distributed in a fan shape or a ring shape.

[0157] In this way, the wire 11 is located in a fan-shaped area or a ring-shaped area, so that the overall shape of the wire 11 is more suitable for the shape of the welding piece 10, and the arrangement design of the wire 11 is facilitated.

[0158] In some examples, the plurality of straight wires 111 are distributed in a fan shape, which means that the connecting line of the midpoints of the plurality of straight wires 111 is an arc segment.

[0159] In some examples, the plurality of straight wires 111 are distributed in a ring shape, which means that the connecting line of the midpoints of the plurality of straight wires 111 is a circle.

[0160] In some embodiments, as shown in Figure 10 and Figure 12As shown, the first end of the different straight wire 111 is located on a first circle with a radius of R1, the second end of the different straight wire 111 is located on a second circle with a radius of R2, and the included angle between two adjacent straight wires 111 is a; The curved wire 112 includes a circular arc wire 1122, the number of the circular arc wire 1122 is at least two, the at least two circular arc wires 1122 include a first circular arc wire 1123 and a second circular arc wire 1124, the straight wire 111 connects the first circular arc wire 1123 and the second circular arc wire 1124, both ends of the first circular arc wire 1123 are located on the first circle, both ends of the second circular arc wire 1124 are located on the second circle, the radius of the first circular arc wire 1123 is r2, and the radius of the second circular arc wire 1124 is r1.

[0161] Specifically, the length of the straight wire 111 is R2-R1.

[0162] In this way, it is illustrated that the straight wire 111 is the shortest distance between the first circular arc wire 1123 and the second circular arc wire 1124, which ensures the rapid transition between the first circular arc wire 1123 and the second circular arc wire 1124.

[0163] Specifically, along the radial direction of the first circle, the width of the wire 11 is R2-R1+r1+r2; and / or, In this way, it can be prevented that the width of the wire 11 is too small, and the welding effect of the welding piece 10 and the tab is ensured.

[0164] Specifically, the length of the wire 11 is n*(R2-R1)+π*r1*k1+π*r2*k2, n is the number of the straight wire 111, k1 is the number of the first circular arc wire 1123, and k2 is the number of the second circular arc wire 1124.

[0165] In this way, it can be prevented that the length of the wire 11 is too small, and the welding effect of the welding piece 10 and the tab is ensured.

[0166] Specifically, the central angle of the wire 11 is d, and d is greater than or equal to 10°.

[0167] In this way, the coverage angle of the wire 11 is ensured, and the welding connection effect of the welding piece 10 and the tab is ensured.

[0168] In some embodiments, the wire 11 is a one-time formed continuous wire.

[0169] It can be understood that the single wire 11 is formed by continuous welding, rather than being spliced by two or more times of welding, so that it can be ensured that there is no heat accumulation in the process of forming the single wire 11.

[0170] In some embodiments, the number of curved weld lines 112 is at least two, and two adjacent curved weld lines 112 are connected by a straight weld line 111, wherein the distance between the midpoints of two different adjacent curved weld lines is the same along the radial direction of the weldment 10.

[0171] This ensures the structural uniformity of the bonding wire 11, thereby ensuring the uniformity of the bonding wire density distribution, so that the welding effect at different locations remains the same.

[0172] This embodiment can also be understood as follows: the radial length of each curved weld line 112 is the same, and the distance between two adjacent curved weld lines 112 remains unchanged.

[0173] In some embodiments, the length of the weld line along the radial direction of the weldment is x, and the shortest distance between the weld line and the outer edge of the weldment is x1.

[0174] Specifically, along the radial direction of the welded part, the shortest distance between the weld line and the center of the welded part is x2, where x ≥ x1 + x2.

[0175] This ensures the coverage length and area of ​​the weld wire in the radial direction, thus guaranteeing the welding quality.

[0176] Specifically, the welded part has a central hole, and along the radial direction of the welded part, the shortest distance between the weld line and the inner edge of the welded part is x3, where x ≥ x1 + x3.

[0177] This ensures the coverage length and area of ​​the weld wire in the radial direction, thus guaranteeing the welding quality.

[0178] In some embodiments, the bonding wire 11 includes a first bonding wire portion 115, a main body portion 116, and a second bonding wire portion 117 connected in sequence. Along the radial direction of the welded part, the first bonding wire portion 115, the main body portion 116, and the second bonding wire portion 117 are distributed in sequence toward a position away from the center of the welded part. The total length of the first bonding section 115 is greater than the total length of the second bonding section 117.

[0179] This ensures the welding length in the central area of ​​the welded parts, improves the welding connection stability in the central area of ​​the welded parts, and helps to improve the overall connection stability between the welded parts and the parts to be connected.

[0180] It is understandable that the total length of the first bonding wire portion 115 refers to the length after the first bonding wire portion 115 is straightened, and the total length of the second bonding wire portion 117 refers to the length after the second bonding wire portion 117 is straightened.

[0181] In some examples, the first bonding wire portion 115 is, for example, a straight bonding wire.

[0182] In some examples, the second bonding wire portion 117 is, for example, a straight bonding wire.

[0183] According to an embodiment of the second aspect of this application, the battery includes the aforementioned welded component 10.

[0184] According to the battery embodiment of this application, the welding line 11 at the welded component 10 is designed to consist of a straight welding line 111 and a curved welding line 112. This effectively increases the length of the welding line 11, which is beneficial for improving welding stability and welding quality. Furthermore, there are no intersections on the same welding line 11, which avoids the problem of excessive heat accumulation at intersections caused by the presence of intersections on a single welding line 11. This effectively prevents excessive heat accumulation in some areas from damaging the battery separator, ensuring welding stability and welding quality, and thus improving battery safety.

[0185] In some embodiments, such as Figure 14 As shown, the battery includes a component to be connected, which includes a tab 20. The welding component 10 is welded to the tab 20, and the weld penetration depth at the tab 20 is H3, wherein 0.1≤H3 / H2≤2.

[0186] Understandably, if the ratio of the weld penetration depth at the tab 20 to the thickness of the welded part 10 is less than 0.1, it indicates that the weld penetration depth at the tab 20 is shallow, and the connection stability between the welded part 10 and the tab 20 is insufficient. If the ratio of the weld penetration depth at the weld to the thickness of the welded part 10 is greater than 2, the weld may penetrate the tab 20, affecting the welding quality. Therefore, in this embodiment, the ratio of the weld penetration depth at the weld to the thickness of the welded part 10 is set between 0.1 and 2, ensuring the connection stability between the welded part 10 and the tab 20, while also preventing the weld penetration depth from being too deep and thus avoiding weld penetration of the connected part, thereby ensuring the welding quality.

[0187] In some embodiments, the welded component includes a positive busbar, wherein 0.1 ≤ H3 / H2 ≤ 1.25.

[0188] Understandably, if the ratio of the weld penetration depth at the tab 20 to the thickness of the positive busbar is less than 0.1, it indicates that the weld penetration depth at the tab 20 is shallow, and the connection stability between the positive busbar and the tab 20 is insufficient. If the ratio of the weld penetration depth at the weld to the thickness of the positive busbar is greater than 1.25, the weld may penetrate the tab 20, affecting the welding quality. Therefore, in this embodiment, the ratio of the weld penetration depth at the weld to the thickness of the positive busbar is set between 0.1 and 1.25, ensuring the connection stability between the positive busbar and the tab 20, while also preventing the weld penetration depth from being too deep and thus avoiding penetration of the tab 20, thereby ensuring the welding quality.

[0189] In some embodiments, the welded component includes a negative electrode busbar, wherein 0.2 ≤ H3 / H2 ≤ 2.

[0190] Understandably, if the ratio of the weld penetration depth at the tab 20 to the thickness of the negative electrode busbar is less than 0.2, it indicates that the weld penetration depth at the tab 20 is shallow, and the connection stability between the negative electrode busbar and the tab 20 is insufficient. If the ratio of the weld penetration depth at the weld to the thickness of the negative electrode busbar is greater than 2, the weld may penetrate the tab 20, affecting the welding quality. Therefore, in this embodiment, the ratio of the weld penetration depth at the weld to the thickness of the negative electrode busbar is set between 0.2 and 2, ensuring the connection stability between the negative electrode busbar and the tab 20, while also preventing the weld penetration depth from being too deep and thus avoiding penetration of the tab 20, thereby ensuring the welding quality.

[0191] According to an embodiment of the third aspect of this application, the electrical device includes the battery described above.

[0192] According to the embodiments of this application, the welding line 11 at the welded part 10 is designed to consist of a straight welding line 111 and a curved welding line 112. This effectively increases the length of the welding line 11, which is beneficial to improving welding stability and welding quality. Furthermore, there are no intersections on the same welding line 11, which avoids the problem of excessive heat accumulation at intersections caused by the presence of intersections on a single welding line 11. This effectively prevents excessive heat accumulation in some areas from damaging the battery separator, ensuring welding stability and welding quality, thereby improving battery safety and ensuring the stability of the electrical equipment.

[0193] It should be noted that electrical equipment can include energy storage power supplies, medical equipment, smart cities, etc. It is important to note that the above are merely illustrative examples of electrical equipment and do not impose any specific limitations on the types of equipment used.

[0194] According to an embodiment of the fourth aspect of this application, the welding method is applied to the welded component 10 as described above, the welded component 10 having a weld wire group 12, the weld wire group 12 including at least a first weld wire and a second weld wire, the first weld wire and the second weld wire intersecting each other, and the number of weld wire groups 12 is at least two; the welding method includes: The first weld wires of different weld wire groups 12 are sequentially welded together; The second weld wires of different weld wire groups 12 are formed by welding in sequence.

[0195] According to the welding method of this application embodiment, first weld wires of different weld wire groups 12 are formed sequentially, and then second weld wires of different weld wire groups 12 are formed. This allows the first weld wires and second weld wires of the same weld wire group 12 to be formed sequentially at a certain time interval, thereby avoiding excessive heat accumulation at the intersection of the first weld wires and the second weld wires and ensuring welding quality.

[0196] In some examples, at least two wire bonding groups 12 include a first wire bonding group and a second wire bonding group. First, the first wires forming the first wire bonding group and the first wires forming the second wire bonding group are soldered sequentially. Then, the second wires forming the first wire bonding group and the second wires forming the second wire bonding group are soldered sequentially. This results in a certain time interval between the formation of the first and second wires in the first wire bonding group and a certain time interval between the formation of the first and second wires in the second wire bonding group. Consequently, when the second wire is formed, there is essentially no residual heat or very low residual heat at the first wire, thus preventing excessive heat accumulation at the intersection of the first and second wires.

[0197] According to an embodiment of the fifth aspect of this application, the welding method is applied to the welded component as described above, wherein the number of weld wires 11 is at least two, and the at least two weld wires 11 include a first weld wire 113 and a second weld wire 114, the first weld wire and the second weld wire intersecting each other; the welding method includes: The first weld line is formed by welding. The welding forms a second weld line, wherein the time interval between the formation of the first weld line and the second weld line is 0.1 seconds to 1 second.

[0198] According to the welding method of this application embodiment, a first weld line is first welded to form a second weld line after an interval of 0.1 seconds to 1 second. That is, the first weld line and the second weld line are formed sequentially at a certain time interval, so that the heat at the first weld line can be effectively dissipated before the second weld line is formed. This can avoid the situation where the heat accumulation at the intersection of the first weld line and the second weld line is too high, thus ensuring the welding quality.

[0199] In some examples, the formation time interval between the first and second bond wires is 0.2 seconds.

[0200] This avoids excessive heat buildup at the intersection of the first and second weld wires, ensuring welding quality.

[0201] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A welded component, characterized in that, The welded component has at least one weld line, which includes at least one straight weld line and at least one curved weld line. The straight weld line and the curved weld line are connected in sequence so that the weld line gradually extends in one direction. The weldment is used to weld with the component to be connected. The weld penetration depth at the weld joint between the weldment and the component to be connected is H1, and the thickness of the weldment is H2, wherein 1.1≤H1 / H2≤3.

2. The welded component according to claim 1, characterized in that, The welded component includes a positive electrode busbar, wherein 1.1 ≤ H1 / H2 ≤ 2.5; or, The welded component includes a negative electrode busbar, wherein 1.2 ≤ H1 / H2 ≤ 3.

3. The welded component according to claim 1, characterized in that, The multiple straight welding lines and the multiple curved welding lines are connected alternately in sequence.

4. The welded component according to any one of claims 1 to 3, characterized in that, The welded component has a weld wire group, which includes at least two intersecting weld wires.

5. The welded component according to claim 4, characterized in that, The welding wire group includes intersecting and non-intersecting positions. The weld penetration depth at the intersecting position is h1, and the weld penetration depth at the non-intersecting position is h2, wherein h1-h2≤0.15mm.

6. The welded component according to claim 5, characterized in that, h1-h2≤0.08mm; and / or, 0.05mm≤h1≤0.3mm.

7. The welded component according to claim 4, characterized in that, The intersection of the two welding wires in the welding wire group is located on the curved welding wire, the distance between the intersection and the midpoint of the curved welding wire is y1, and the total length of the curved welding wire is y2, where y1 / y2≤1 / 6.

8. The welded component according to any one of claims 4 to 7, characterized in that, The number of wire bonding groups is at least two, wherein... At least two of the said bond wire groups are distributed at circumferential intervals along the weldment; and / or, At least two of the said weld wire groups are distributed at radial intervals along the weldment.

9. The welded component according to any one of claims 4 to 7, characterized in that, The welded component has at least two weld line areas, each weld line area comprising at least two groups of weld lines, wherein... At least two of the said weld lines are evenly distributed along the circumference of the welded part; and / or, At least two of the weld lines are evenly distributed along the radial direction of the weldment.

10. The welded component according to any one of claims 1 to 9, characterized in that, The number of bonding wires is at least two, and the at least two bonding wires include a first bonding wire and a second bonding wire, wherein the first bonding wire and the second bonding wire are mirror images of each other.

11. The welded component according to any one of claims 1 to 9, characterized in that, Within the same welding line, the straight welding line is tangent to the adjacent curved welding line.

12. The welded component according to any one of claims 1 to 9, characterized in that, The number of bonding wires is at least two, wherein, At least two of the weld lines are distributed at circumferential intervals along the weldment; and / or, At least two of the weld lines are distributed at radial intervals along the weldment.

13. The welded component according to any one of claims 1 to 9, characterized in that, The welded component has at least two weld line regions, each weld line region comprising at least two weld lines, wherein... At least two of the said weld lines are evenly distributed along the circumference of the welded part; and / or, At least two of the weld lines are evenly distributed along the radial direction of the weldment.

14. The welded component according to any one of claims 1 to 9, characterized in that, The welded component has a square area, and the weld line is located within the square area; The square region includes two oppositely arranged first sides and two oppositely arranged second sides; The curved weld line includes at least two arc-shaped weld lines, two adjacent arc-shaped weld lines are connected by a straight weld line, and the convex directions of the two adjacent arc-shaped weld lines are opposite.

15. The welded component according to claim 14, characterized in that, One of the first edges is tangent to one of the two adjacent arc weld lines, and the other first edge is tangent to the other of the two adjacent arc weld lines. The endpoint of the first end of the weld line is located on one of the second edges, and the endpoint of the second end of the weld line is located on the other second edge.

16. The welded component according to claim 14, characterized in that, The number of straight weld lines is at least two, and the curved weld lines connect two adjacent straight weld lines. Different straight weld lines are parallel to each other.

17. The welded component according to claim 14, characterized in that, The number of straight welding lines is n, and the n straight welding lines are distributed sequentially along the extension direction of the first side. The m-th straight welding line and the (m+2)-th straight welding line are parallel to each other, where n≥3 and n-2≥m≥1.

18. The welded component according to claim 14, characterized in that, Along the extension direction of the first side, the length of the first side is A; along the extension direction of the second side, the length of the second side is B; along the extension direction of the straight weld line, the length of the straight line is L; the angle between the straight weld line and the second side is θ; the radius of the arc weld line is r; the chord length of the arc weld line is X; and C is the shortest distance between the midpoints of two adjacent straight weld lines, wherein... X = CL * sinθ; and / or, r = (CL * sinθ) / 2 * cosθ; and / or, B=L*cosθ+C-((CL*sinθ) / cosθ)*(1-sinθ); and / or, A = n * L * sinθ + *, where n is the number of straight welding lines.

19. The welded component according to claim 14, characterized in that, The center of the welded part is located on the extension of the line connecting the midpoints of different straight weld lines on the same weld line.

20. The welded component according to any one of claims 1 to 9, characterized in that, The welding line includes a plurality of straight welding lines, which are distributed in a fan shape or a ring shape.

21. The welded component according to claim 20, characterized in that, The first end of each of the different straight weld lines is located on a first circle with radius R1, the second end of each of the different straight weld lines is located on a second circle with radius R2, and the included angle between two adjacent straight weld lines is α; The curved weld line includes an arc weld line, and the number of the arc weld lines is at least two. Each arc weld line includes a first arc weld line and a second arc weld line. A straight weld line connects the first arc weld line and the second arc weld line. Both ends of the first arc weld line are located on the first circle, and both ends of the second arc weld line are located on the second circle. The radius of the first arc weld line is r2, and the radius of the second arc weld line is r1. The length of the straight weld wire is R2-R1; and / or, Along the radial direction of the first circle, the width of the weld line is R2-R1+r1+r2; and / or, The length of the weld wire is n*(R2-R1)+π*r1*k1+πr2*k2, where n is the number of straight weld wires, k1 is the number of the first circular arc weld wires, and k2 is the number of the second circular arc weld wires; and / or, The central angle of the welding wire is δ, where δ ≥ 10°.

22. The welded component according to any one of claims 1 to 21, characterized in that, The welding wire is a continuous welding wire formed in one step.

23. The welded component according to any one of claims 1 to 21, characterized in that, The number of the curved weld lines is at least two, and two adjacent curved weld lines are connected by a straight weld line, wherein the distance between the midpoints of two different adjacent curved weld lines is the same along the radial direction of the welded part.

24. The welded component according to any one of claims 1 to 21, characterized in that, Along the radial direction of the welded part, the length of the weld line is x, and the shortest distance between the weld line and the outer edge of the welded part is x1, where, Along the radial direction of the welded part, the shortest distance between the weld line and the center of the welded part is x2, where x ≥ x1 + x2; or, The weldment has a central hole, and along the radial direction of the weldment, the shortest distance between the weld line and the inner edge of the weldment is x3, where x ≥ x1 + x3.

25. The welded component according to any one of claims 1 to 18, characterized in that, The welding wire includes a first welding wire portion, a main body portion, and a second welding wire portion connected in sequence. Along the radial direction of the welded part, the first welding wire portion, the main body portion, and the second welding wire portion are distributed in sequence toward a position away from the center of the welded part. The total length of the first bonding wire portion is greater than the total length of the second bonding wire portion.

26. A battery, characterized in that, Includes the weldment as described in any one of claims 1 to 25.

27. The battery according to claim 26, characterized in that, The battery includes a component to be connected, the component to be connected includes a tab, the welding component is welded to the tab, and the weld penetration depth at the tab is H3, wherein 0.1≤H3 / H2≤2.

28. The battery according to claim 27, characterized in that, The welded component includes a positive electrode busbar, wherein 0.1 ≤ H3 / H2 ≤ 1.25; or, The welded component includes a negative electrode busbar, wherein 0.2 ≤ H3 / H2 ≤ 2.

29. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 26 to 28.

30. A welding method applied to a weldment as described in any one of claims 1 to 25, characterized in that, The welded component has weld wire groups, each weld wire group including at least a first weld wire and a second weld wire, the first weld wire and the second weld wire intersecting each other, and the number of weld wire groups is at least two; the welding method includes: The first weld wires, which form different groups of weld wires, are sequentially welded together; The second weld wires are sequentially welded to form different groups of weld wires.

31. A welding method applied to a weldment as described in any one of claims 1 to 25, characterized in that, The number of welding wires is at least two, and the at least two welding wires include a first welding wire and a second welding wire, wherein the first welding wire and the second welding wire intersect each other; the welding method includes: The first weld line is formed by welding. The second weld line is formed by welding, wherein the time interval between the formation of the first weld line and the second weld line is 0.1 seconds to 1 second.

32. The welding method according to claim 31, characterized in that, The formation time interval between the first and second bonding wires is 0.2 seconds.

Images