Convergence plate, battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a convergence plate, a battery cell and a battery pack. And reinforcing ribs are arranged on the convergence plate. The reinforcing ribs are provided with first rib edges close to the circle center of the confluence disc. And the distance between the first rib edge and the circle center of the confluence plate is L1. And the radius of the confluence plate is R1. L1 is larger than or equal to 0.2 R1 and smaller than or equal to 0.5 R1. Therefore, the possibility of deformation of the confluence plate can be reduced, the welding yield of the confluence plate and the roll core is improved, the consistency of the resistance value of the battery core is further improved, and enough welding area between the confluence plate and the negative electrode of the battery core can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, concretely relates to busbar, electric core and battery pack. BACKGROUND

[0002] In the related art, the negative busbar is usually made of copper material, and in order to reduce the space occupied by the negative busbar in height, the thickness of the negative busbar is usually thin, which causes the negative busbar to have low strength and be prone to deformation. After the negative busbar deforms, a gap appears between the negative busbar and the end face of the winding core, which causes a virtual welding phenomenon between the negative busbar and the winding core, and makes the welding defective rate high. At the same time, the virtual welding also reduces the current channel between the negative busbar and the winding core, which causes the resistance value of the electric core to increase. SUMMARY

[0003] The embodiment of the utility model provides a kind of busbar, electric core and battery pack, utilize reinforcing rib to strengthen the structure of busbar, reduce the possibility of busbar deformation, to improve the yield of busbar and winding core welding, and can improve the consistency of electric core resistance value.

[0004] In the first aspect, the embodiment of the utility model provides a kind of busbar, the reinforcing rib is structured on the busbar, the reinforcing rib has the first rib edge close to the busbar center, the spacing between the first rib edge and the busbar center is L1, the radius of the busbar is R1, satisfy: 0.2R1≤L1≤0.5R1.

[0005] In an embodiment, the first rib edge is arranged as an arc, and the arc has the same center as the busbar.

[0006] In an embodiment, the reinforcing rib also has the second rib edge away from the busbar center, the spacing between the second rib edge and the edge of the busbar is L2, satisfy: 0.25R1≤L2≤0.5R1.

[0007] In an embodiment, the second rib edge is arranged as an arc, and the arc has the same center as the busbar.

[0008] In an embodiment, the reinforcing rib also has the third rib edge and the fourth rib edge arranged oppositely, the third rib edge and the fourth rib edge both extend along the radial direction of the busbar, wherein the included angle between the third rib edge and the fourth rib edge is α, satisfy: 6°≤α≤12°.

[0009] In an embodiment, the reinforcing rib extends along the radial direction of the busbar, at least two reinforcing ribs are arranged on the busbar, and the at least two reinforcing ribs are arranged at intervals along the circumferential direction of the busbar.

[0010] In an embodiment, the cross-sectional area of the busbar is S1, the total area of the at least two reinforcing ribs is S2, and the following condition is met: 0.6%≤S2 / (S1+S2)≤13.9%.

[0011] In some embodiments, a boss is configured at the center of the busbar, the boss is configured to be welded with a negative electrode of a battery cell, each of the reinforcing ribs is in the same direction as the boss, the height of each of the reinforcing ribs is H1, the height of the boss is H2, and the following condition is met: H1≤H2.

[0012] In an embodiment, a welding wire is arranged on the busbar between two adjacent reinforcing ribs, and the welding wire is located on a side away from the boss.

[0013] In a second aspect, an embodiment of the utility model provides a battery cell, which comprises the busbar as described above.

[0014] In a third aspect, an embodiment of the utility model provides a battery pack, which comprises the battery cell as described above.

[0015] The embodiment of the utility model has the following beneficial effects:

[0016] In the embodiment of the utility model, the busbar is structurally reinforced by the reinforcing ribs, the possibility of deformation of the busbar is reduced, the yield of welding between the busbar and the winding core is improved, and the consistency of the resistance of the battery cell is improved. Based on the condition that the distance L1 between the first rib edge and the center of the busbar is arranged in the range of 0.2R1-0.5R1, the central region of the busbar can have sufficient area to be punched to form a boss, and the boss is used to realize welding between the busbar and the negative electrode of the battery cell. Therefore, the busbar and the negative electrode of the battery cell can have sufficient welding area. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a perspective view of the busbar provided by the embodiment of the utility model;

[0019] Figure 2 is one of the bottom views of the busbar provided by the embodiment of the utility model;

[0020] Figure 3 is the second bottom view of the busbar provided by the embodiment of the utility model.

[0021] Figure 4 is a top view of the busbar provided by the embodiment of the utility model;

[0022] Figure 5 is a sectional view of the busbar provided by the embodiment of the utility model.

[0023] Reference signs:

[0024] 10-busbar, 20-stiffener, 210-first edge, 220-second edge, 230-third edge, 240-fourth edge, 30-boss, 40-welding line. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, the orientation words such as 'up' and 'down' generally refer to the up and down in the actual use or working state of the device, and specifically refer to the drawing direction in the drawings. And 'inner' and 'outer' refer to the contour of the device.

[0026] Please refer to Figures 1 to 5 The embodiment of the application provides a busbar 10. The busbar 10 is provided with a stiffener 20. The stiffener 20 has a first edge 210 close to the center of the busbar 10. The distance between the first edge 210 and the center of the busbar 10 is L1. The radius of the busbar 10 is R1. It is satisfied that 0.2R1≤L1≤0.5R1.

[0027] In the embodiment of the application, the busbar 10 is structurally reinforced by the stiffener 20, which reduces the possibility of deformation of the busbar 10, thereby improving the yield of the welding of the busbar 10 and the core, and improving the consistency of the resistance value of the core. Wherein, based on setting the distance L1 between the first edge 210 and the center of the busbar 10 in the range of 0.2R1~0.5R1, it can be ensured that the central region of the busbar 10 has enough area to be punched to form a boss 30, and the boss 30 is used to realize the welding between the busbar 10 and the negative electrode of the core. Therefore, it can be ensured that the busbar 10 and the negative electrode of the core have enough welding area.

[0028] Understandably, when the distance L1 between the first rib edge 210 and the center of the busbar 10 is less than 0.2R1, the area of ​​the protrusion 30 formed at the center of the busbar 10 is small. In this case, the welding area between the busbar 10 and the negative electrode of the battery cell is too small, resulting in insufficient reliability of the connection between the busbar 10 and the negative electrode of the battery cell. When the distance L1 between the first rib edge 210 and the center of the busbar 10 is greater than 0.5R1, the extension length of the reinforcing rib 20 is short, affecting the structural reinforcement effect of the busbar 10.

[0029] The spacing between the first rib edge 210 of the reinforcing rib 20 and the center of the busbar 10 is designed to ensure that the central region of the busbar 10 retains sufficient area to form the boss 30. This boss 30 is used for welding to the negative electrode of the battery cell. Therefore, the busbar 10 in this embodiment is particularly suitable as a negative electrode busbar.

[0030] like Figure 2 and Figure 3 As shown, in some embodiments, the reinforcing rib 20 is a strip rib extending radially along the manifold 10. The distance L1 between the first rib edge 210 and the center of the manifold 10 can be set to 0.2R1, 0.3R1, 0.4R1, 0.5R1, or any value between the two.

[0031] In some embodiments, the reinforcing rib 20 can also be configured as other shapes such as fan-shaped, circular, square, or elliptical, and the shape of the reinforcing rib 20 can be reasonably selected based on the required reinforcement effect.

[0032] In some embodiments, the radius R1 of the busbar 10 can be specifically selected based on the battery cell model so that the busbar 10 can be disposed at the negative terminal of the battery cell. For example, the radius R1 of the busbar 10 can be set to 16 mm. In this case, the distance L1 between the first rib 210 and the center of the busbar 10 can be set in the range of 3.2 mm to 8 mm. For example, the distance L1 between the first rib 210 and the center of the busbar 10 can be set to 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or any value between the two.

[0033] like Figure 3 As shown, in some embodiments, the first rib 210 is set to be arc-shaped and shares the same center with the busbar 10. The radius of the first rib 210 is R2, satisfying: 0.2R1≤R2≤0.5R1.

[0034] It is understandable that by setting the first rib 210 to an arc shape and limiting the radius of the first rib 210, the distance between the first rib 210 and the center of the busbar 10 can be limited, thereby ensuring that there is a sufficient area on the busbar 10 to form the protrusion 30.

[0035] The first rib edge 210 and the manifold 10 share the same center. When stamping the reinforcing rib 20, the center of the manifold 10 can be used as a reference to achieve rapid stamping positioning.

[0036] The radius R2 of the first rib edge 210 can be set to 0.2R1, 0.3R1, 0.4R1, 0.5R1, or any value between the two.

[0037] For example, when the radius R1 of the manifold 10 is set to 16 mm, the radius R2 of the first rib 210 can be set to a range of 3.2 mm to 8 mm. For example, the radius R2 of the first rib 210 can be set to 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or any value between the two.

[0038] like Figure 2 As shown, in some embodiments, the first rib 210 can also be set to other shapes such as straight line, wave, ellipse, etc., as long as there is sufficient distance between the first rib 210 and the center of the busbar 10.

[0039] like Figure 2 and Figure 3 As shown, in some embodiments, the reinforcing rib 20 further has a second rib edge 220 located away from the center of the manifold 10. The distance between the second rib edge 220 and the edge of the manifold 10 is L2, satisfying: 0.25R1≤L2≤0.5R1.

[0040] Understandably, the second rib edge 220 can define the position of the reinforcing rib 20 near the edge of the manifold 10. The distance L2 between the second rib edge 220 and the edge of the manifold 10 is set within the range of 0.25R1 to 0.5R1 to ensure that the edge region of the manifold 10 has sufficient area for edge pressing, ensuring that the reinforcing rib 20 can be formed on the manifold 10 through a stamping process.

[0041] When the distance L2 between the second rib edge 220 and the edge of the busbar 10 is less than 0.25R1, the remaining area of ​​the edge region of the busbar 10 is small. In this case, the blanking width during stamping is insufficient, and the reinforcing rib 20 cannot be formed by stamping. When the distance L2 between the second rib edge 220 and the edge of the busbar 10 is greater than 0.5R1, the extension length of the reinforcing rib 20 will be short, affecting the structural reinforcement effect on the busbar 10.

[0042] In some embodiments, the distance L2 between the second rib edge 220 and the edge of the busbar 10 can be set to 0.25R1, 0.3R1, 0.4R1, 0.5R1, or any value between any two of them. It should be noted that the distance L2 between the second rib edge 220 and the edge of the busbar 10 and the distance L1 between the first rib edge 210 and the center of the busbar 10 cannot be equal to 0.5R1 at the same time. That is: when L2 = 0.5R1, L1 < 0.5R1; when L1 = 0.5R1, L2 < 0.5R1.

[0043] For example, when the radius R1 of the busbar 10 is set to 16 mm, the distance L2 between the second rib edge 220 and the edge of the busbar 10 can be set to a range of 4 mm to 8 mm. For example, the distance L2 between the second rib edge 220 and the edge of the busbar 10 can be set to 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or any value between any two of them.

[0044] As shown in Figure 3 In some embodiments, the second rib edge 220 is set to be arc-shaped and has the same center as the busbar 10. The radius of the second rib edge 220 is R3. It satisfies: 0.5R1≤R3≤0.75R1.

[0045] It can be understood that, based on setting the second rib edge 220 to be arc-shaped and limiting the radius of the second rib edge 220, the distance between the second rib edge 220 and the edge of the busbar 10 can be limited, thereby ensuring that there is enough edge pressing area on the busbar 10 to ensure that the reinforcing rib 20 can be formed by a stamping process.

[0046] The second rib edge 220 has the same center as the busbar 10, and when the reinforcing rib 20 is formed by stamping, the center of the busbar 10 can be used as a reference to achieve rapid stamping positioning.

[0047] The radius R3 of the second rib edge 220 can be set to 0.5R1, 0.6R1, 0.7R1, 0.75R1, or any value between any two of them.

[0048] For example, when the radius R1 of the busbar 10 is set to 16 mm, the radius R3 of the second rib edge 220 can be set to a range of 8 mm to 12 mm. For example, the radius R3 of the second rib edge 220 can be set to 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, or any value between any two of them.

[0049] As shown in Figure 2 In some embodiments, the second rib edge 220 can also be set to be straight, wavy, oval, or other shapes, as long as it has enough distance from the edge of the busbar 10.

[0050] Please continue to refer to Figure 3 In some embodiments, the reinforcing rib 20 further has a third rib edge 230 and a fourth rib edge 240 arranged oppositely. The third rib edge 230 and the fourth rib edge 240 both extend along the radial direction of the busbar 10. The included angle between the third rib edge 230 and the fourth rib edge 240 is α, and 6°≤α≤12° is satisfied.

[0051] It can be understood that the included angle α between the third rib edge 230 and the fourth rib edge 240 can define the width of the reinforcing rib 20. The first rib edge 210, the second rib edge 220, the third rib edge 230 and the fourth rib edge 240 are closed and connected to form the reinforcing rib 20. When the included angle α between the third rib edge 230 and the fourth rib edge 240 is less than 6°, the width of the reinforcing rib 20 is small, which affects the structural reinforcing effect of the busbar 10. When the included angle α between the third rib edge 230 and the fourth rib edge 240 is greater than 12°, the reinforcing rib 20 will occupy the welding area of the busbar 10 and the core, resulting in poor welding of the busbar 10 and the core.

[0052] In some embodiments, the included angle α between the third rib edge 230 and the fourth rib edge 240 can be set to 6°, 7°, 8°, 9°, 10°, 11°, 12°, or any value between any two of them.

[0053] For example, the included angle α between the third rib edge 230 and the fourth rib edge 240 can be set to 10°. When the first rib edge 210 and the second rib edge 220 are both set to be straight lines, the length of the first rib edge 210 can be set to 0.35 mm, and the length of the second rib edge 220 can be set to 1.05 mm. At this time, the width of the reinforcing rib 20 near the center of the busbar 10 is 0.35 mm, and the width far from the center of the busbar 10 is 1.05 mm. When the first rib edge 210 and the second rib edge 220 are both set to be arc-shaped, the arc length of the first rib edge 210 can be set to 0.35 mm, and the arc length of the second rib edge 220 can be set to 1.05 mm. At this time, the width of the reinforcing rib 20 near the center of the busbar 10 and the width far from the center of the busbar 10 can be calculated based on the positions of the first rib edge 210 and the second rib edge 220. Alternatively, when the first rib edge 210 and the second rib edge 220 are both set to be arc-shaped, the width of the reinforcing rib 20 near the center of the busbar 10 can be directly set to 0.35 mm, and the width far from the center of the busbar 10 can be directly set to 1.05 mm.

[0054] Please continue to refer to Figure 2 and Figure 3 In some embodiments, the reinforcing rib 20 extends along the radial direction of the busbar 10, and at least two reinforcing ribs 20 are arranged on the busbar 10. The at least two reinforcing ribs 20 are arranged at intervals along the circumferential direction of the busbar 10.

[0055] It can be understood that by arranging at least two reinforcing ribs 20 on the busbar 10, the structural strength of the busbar 10 can be further improved, and the deformation of the busbar 10 can be further prevented.

[0056] In the embodiment of the application, the reinforcing ribs 20 extend along the radial direction of the busbar 10, so that the reinforcing ribs 20 can avoid the welding wires 40 on the busbar 10, thereby ensuring that the busbar 10 has sufficient area to be welded with the winding core.

[0057] In some embodiments, the at least two reinforcing ribs 20 are centrally symmetrically distributed along the center of the busbar 10. In this way, the structural strength of the busbar 10 at each position in the circumferential direction can be improved, and the deformation of the busbar 10 can be prevented.

[0058] For example, the busbar 10 can be provided with 2, 3, 4, 5, 6, 7 or 8 reinforcing ribs 20. As shown in FIG. 1, the busbar 10 is preferably provided with 8 reinforcing ribs 20 in the embodiment of the application, so as to maximize the structural strengthening area and improve the structural strength of the busbar 10. Figure 1

[0059] In some embodiments, the cross-sectional area of the busbar 10 is S1, and the total area of the at least two reinforcing ribs 20 is S2, which satisfies: 0.6%≤S2 / (S1+S2)≤13.9%.

[0060] It can be understood that the proportion of the total area S2 of the at least two reinforcing ribs 20 can directly reflect the size of the structural strengthening area of the busbar 10. The greater the structural strengthening area, the greater the strength of the busbar 10. When S2 / (S1+S2) is less than 0.6%, the structural strengthening area is too small, which may affect the strength of the busbar 10. When S2 / (S1+S2) is greater than 13.9%, the reinforcing ribs 20 may occupy too much area, which may affect the area of the central boss 30 of the busbar 10, the area of the edge region of the busbar 10, and the area of the welding region of the busbar 10 and the winding core.

[0061] It should be noted that the cross-sectional area S1 of the busbar 10 is the area of the busbar 10 excluding the area of the reinforcing ribs 20. The value of (S1+S2) can be directly calculated based on the radius R1 of the busbar 10.

[0062] For example, when the cross-sectional area S1 of the busbar 10 is set to 800 square millimeters, the total area S2 of the at least two reinforcing ribs 20 can be set in the range of 4.8 square millimeters to 111.2 square millimeters. For example, the total area S2 of the at least two reinforcing ribs 20 can be set to 10 square millimeters, 50 square millimeters, 100 square millimeters, or any value between any two of them.

[0063] ​In some embodiments, when the radius R1 of the manifold 10 is set to 16 mm, the radius R2 of the first rib 210 can be set to 4 mm, the radius of the second rib 220 can be set to 12 mm, the included angle α between the third rib 230 and the fourth rib 240 can be set to 10°, and the ratio of the total area S2 of the at least two reinforcing ribs 20 to the cross-sectional area S1 of the manifold 10 can be set to 11%.

[0064] like Figure 5 As shown, in some embodiments, a boss 30 is constructed at the center of the busbar 10. The boss 30 is configured to be welded to the negative electrode of the battery cell. Each reinforcing rib 20 has the same protrusion direction as the boss 30. The protrusion height of each reinforcing rib 20 is H1. The protrusion height of the boss is H2. The following condition is satisfied: H1 ≤ H2.

[0065] The reinforcing rib 20 and the boss 30 are aligned in the same direction to avoid interference between the reinforcing rib 20 and the welding between the busbar 10 and the core. The height H1 of the reinforcing rib 20 is lower than the height H2 of the boss to avoid interference between the reinforcing rib 20 and the welding between the busbar 10 and the negative electrode of the battery cell.

[0066] In some embodiments, the thickness of the busbar 10 is X, and the protrusion height H1 of the reinforcing rib 20 can be equal to 1 / 2X. Alternatively, the protrusion height H1 of the reinforcing rib 20 can be equal to 1 / 3X, 2 / 3X, or 1 / 4X, 3 / 4X. The protrusion height of the reinforcing rib 20 can be reasonably selected based on the stamping process.

[0067] The thickness of the reinforcing rib 20 and the thickness of the boss 30 can both be the same as the thickness of the busbar 10. In some embodiments, the thickness X of the busbar 10 can be set to 0.1 mm to 0.3 mm. For example, the thickness X of the busbar 10 can be set to 0.1 mm, 0.2 mm, 0.3 mm, or any value between the two.

[0068] Understandably, when the thickness of the busbar 10 is less than 0.1 mm, it will result in insufficient welding tension between the busbar 10 and the core and the negative electrode of the battery cell. When the thickness of the busbar 10 is greater than 0.3 mm, it will result in the busbar 10 occupying too much height space.

[0069] In some embodiments, a weld line 40 is provided on the busbar 10 between two adjacent reinforcing ribs 20. The weld line 40 is located on the side of the busbar 10 away from the boss 30.

[0070] It can be understood that the boss 30 of the busbar 10 is used to realize welding between the busbar 10 and the negative electrode of the battery cell at the bottom of the battery cell, and the welding wire 40 of the busbar 10 is used to realize welding between the busbar 10 and the winding core inside the battery cell, so as to realize welding fixation and electrical connection of the busbar 10.

[0071] Please refer to Figure 4 In some embodiments, the busbar 10 can be configured with a welding wire 40 between each adjacent two reinforcing ribs 20. The welding wire 40 can be arranged in a serpentine shape to ensure that the busbar 10 has a large enough welding area with the winding core.

[0072] As Figure 4 shown, the welding wire 40 can have a first end close to the boss 30 and a second end away from the boss 30. The first end has a distance L3 from the center of the busbar 10. It is satisfied that L3≥0.4R1. The second end has a distance L4 from the center of the busbar 10. It is satisfied that L4≤0.8R1.

[0073] It can be understood that if the distance L3 between the first end of the welding wire 40 and the center of the busbar 10 is less than 0.4R1, the welding area between the busbar 10 and the winding core will be too close to the boss 30, which may cause the boss 30 to be deformed when the busbar 10 and the winding core are welded, thereby affecting the welding between the boss 30 and the negative electrode of the battery cell. If the distance L4 between the second end of the welding wire 40 and the center of the busbar 10 is greater than 0.8R1, the welding area between the busbar 10 and the winding core will be too close to the edge of the busbar 10, which may cause the edge of the busbar 10 to be deformed.

[0074] For example, the distance L3 between the first end of the welding wire 40 and the center of the busbar 10 can be set to 7.5mm. The distance L4 between the second end of the welding wire 40 and the center of the busbar 10 can be set to 12mm.

[0075] As Figure 4 shown, the distance between the opposite sides of the serpentine-shaped welding wire 40 is D, which is satisfied that D=1.6mm. Thus, the busbar 10 has a large enough welding area with the winding core.

[0076] The application also provides an electric cell. The electric cell comprises the busbar 10 as described in the foregoing embodiments.

[0077] In the embodiment of the present application, the structural reinforcement of the busbar plate 10 is strengthened by the reinforcing rib 20, the possibility of deformation of the busbar plate 10 is reduced, the yield of the welding of the busbar plate 10 and the winding core is improved, and the consistency of the resistance value of the battery cell is improved. Among them, based on the distance L1 between the first rib edge 210 and the center of the busbar plate 10 is set in the range of 0.2R1~0.5R1, it can be ensured that the central region of the busbar plate 10 has enough area to punch the boss 30, and the boss 30 is used to realize the welding between the busbar plate 10 and the negative electrode of the battery cell. Therefore, it can be ensured that the busbar plate 10 and the negative electrode of the battery cell have enough welding area.

[0078] The embodiment of the present application also provides a battery pack. The battery pack comprises the battery cell as in the foregoing embodiment.

[0079] In the embodiment of the present application, the structural reinforcement of the busbar plate 10 is strengthened by the reinforcing rib 20, the possibility of deformation of the busbar plate 10 is reduced, the yield of the welding of the busbar plate 10 and the winding core is improved, and the consistency of the resistance value of the battery cell is improved. Among them, based on the distance L1 between the first rib edge 210 and the center of the busbar plate 10 is set in the range of 0.2R1~0.5R1, it can be ensured that the central region of the busbar plate 10 has enough area to punch the boss 30, and the boss 30 is used to realize the welding between the busbar plate 10 and the negative electrode of the battery cell. Therefore, it can be ensured that the busbar plate 10 and the negative electrode of the battery cell have enough welding area.

[0080] The above describes the embodiments of the present application in detail, and the principles and implementation modes of the present application are described by applying specific examples. The above embodiment is only used to help understand the method and core idea of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A busbar characterized by, The reinforcing rib is provided on the busbar and has a first rib edge close to the center of the busbar, the distance between the first rib edge and the center of the busbar is L1, the radius of the busbar is R1, and 0.2R1≤L1≤0.5R1 is satisfied.

2. The busbar of claim 1, wherein The first rib edge is arranged in an arc shape and shares the center with the busbar.

3. The busbar of claim 1, wherein The reinforcing rib also has a second rib edge away from the center of the busbar, the distance between the second rib edge and the edge of the busbar is L2, and 0.25R1≤L2≤0.5R1 is satisfied.

4. The busbar of claim 3, wherein The second rib edge is arranged in an arc shape and shares the center with the busbar.

5. The busbar according to any one of claims 1 to 4, characterized in that The reinforcing rib also has a third rib edge and a fourth rib edge arranged oppositely, and the third rib edge and the fourth rib edge both extend along the radial direction of the busbar, wherein the included angle between the third rib edge and the fourth rib edge is α, and 6°≤α≤12° is satisfied.

6. The busbar according to any one of claims 1 to 4, characterized in that The reinforcing rib extends along the radial direction of the busbar, at least two reinforcing ribs are provided on the busbar and are arranged at intervals along the circumferential direction of the busbar.

7. The busbar of claim 6, wherein, The cross-sectional area of the busbar is S1, the total area of the at least two reinforcing ribs is S2, and 0.6%≤S2 / (S1+S2)≤13.9% is satisfied.

8. The busbar of claim 6, wherein, The center of the busbar is provided with a boss configured to be welded with a negative electrode of a battery cell, wherein each of the reinforcing ribs has the same direction of protrusion as the boss, the protrusion height of each of the reinforcing ribs is H1, the protrusion height of the boss is H2, and H1≤H2 is satisfied.

9. The busbar of claim 8, wherein, The busbar is provided with a welding wire between two adjacent reinforcing ribs, wherein the welding wire is located on the side away from the boss.

10. An electric cell characterized by The busbar comprises any one of the busbars according to claims 1-9.

11. A battery pack, characterized by, The battery cell comprises the busbar according to claim 10.

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