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. Infiltration holes are formed in the confluence plate. The infiltration holes are provided with first hole edges close to the circle center of the confluence plate. And the distance between the first hole 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 liquid injection efficiency can be improved, the production cycle can be shortened, the manufacturing cost can be reduced, and enough welding area between the convergence plate and the negative electrode of the battery cell 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 package. BACKGROUND

[0002] In the related art, the negative busbar is located at the bottom of the electric core. The negative busbar is usually not provided with an opening, so that the negative busbar blocks the upward infiltration of the electrolyte at the bottom of the electric core, resulting in a long production cycle of the electric core. SUMMARY

[0003] Embodiments of the utility model provide a kind of busbar, electric core and battery package, utilize infiltration hole to make the electrolyte at the bottom of electric core can quickly infiltrate upwards, to improve the infiltration rate of electrolyte. Therefore, it can improve the injection efficiency, shorten the production cycle, reduce manufacturing cost.

[0004] In the first aspect, embodiments of the utility model provide a kind of busbar, the infiltration hole is structured on the busbar, the infiltration hole has the first hole edge close to the busbar center, the spacing between the first hole 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 hole edge is set as arc, and with the busbar common center.

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

[0007] In an embodiment, the second hole edge is set as arc, and with the busbar common center.

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

[0009] In an embodiment, the infiltration hole extends along the radial direction of the busbar, at least two infiltration holes are provided on the busbar, and at least two infiltration holes 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 at least two infiltration holes is S2, satisfy: 0.6%≤S2 / (S1+S2)≤13.9%.

[0011] In an embodiment, the busbar is provided with a welding wire between two adjacent infiltration holes, wherein a boss is configured at the center of the busbar and is configured to be welded with the negative electrode of the battery cell, and the welding wire is located on the side away from the boss.

[0012] In a second aspect, the embodiments of the utility model provide a battery cell, which comprises the busbar as described above.

[0013] In a third aspect, the embodiments of the utility model provide a battery pack, which comprises the battery cell as described above.

[0014] The embodiments of the utility model have the following beneficial effects:

[0015] In the embodiments of the utility model, the electrolyte at the bottom of the battery cell can be quickly upwardly infiltrated through the infiltration holes, so that the infiltration rate of the electrolyte is improved. Therefore, the liquid injection efficiency can be improved, the production cycle is shortened, and the manufacturing cost is reduced. Wherein, based on the distance L1 between the first hole edge and the center of the busbar being set in the range of 0.2R1-0.5R1, it can be ensured that the central region of the busbar has sufficient area to be punched to form the boss, and the boss is used to realize the welding between the busbar and the negative electrode of the battery cell. Therefore, it can be ensured that the busbar and the negative electrode of the battery cell have sufficient welding area. BRIEF DESCRIPTION OF DRAWINGS

[0016] 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.

[0017] Figure 1 is a perspective view of the busbar provided by the embodiments of the utility model;

[0018] Figure 2 is one of the busbar bottom views provided by the embodiments of the utility model;

[0019] Figure 3 is the second busbar bottom view provided by the embodiments of the utility model;

[0020] Figure 4 is the top view of the busbar provided by the embodiments of the utility model.

[0021] REFERENCE SIGNS:

[0022] 10-busbar, 20-infiltration hole, 210-first hole edge, 220-second hole edge, 230-third hole edge, 240-fourth hole edge, 30-boss, 40-welding wire. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described 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 of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are 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 of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings. And "inner" and "outer" refer to the outline of the device.

[0024] Please refer to Figures 1 to 4 The present application provides a busbar 10. The busbar 10 is configured with a wicking hole 20. The wicking hole 20 has a first hole edge 210 close to the center of the busbar 10. Wherein, the distance between the first hole 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.

[0025] In the embodiments of the present application, the electrolyte at the bottom of the battery cell can quickly wick upward through the wicking hole 20, thereby improving the wicking rate of the electrolyte. Therefore, the injection efficiency can be improved, the production cycle can be shortened, and the manufacturing cost can be reduced. Wherein, based on setting the distance L1 between the first hole 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 punch the boss 30, and the boss 30 is used to realize the welding between the busbar 10 and the negative electrode of the battery cell. Therefore, it can be ensured that the busbar 10 and the negative electrode of the battery cell have enough welding area.

[0026] It can be understood that when the distance L1 between the first hole edge 210 and the center of the busbar 10 is less than 0.2R1, the area of the boss 30 formed at the center of the busbar 10 is smaller, at this time, it will cause the welding area between the busbar 10 and the negative electrode of the battery cell to be too small, resulting in insufficient connection reliability between the busbar 10 and the negative electrode of the battery cell. When the distance L1 between the first hole edge 210 and the center of the busbar 10 is greater than 0.5R1, it will cause the extension length of the wicking hole 20 to be short, which affects the wicking rate of the electrolyte.

[0027] Based on the setting of the interval between the first hole edge 210 of the infiltration hole 20 and the center of the busbar 10, it is ensured that the central region of the busbar 10 can still retain sufficient area to form the boss 30. The boss 30 is used to realize welding with the negative electrode of the battery cell. Therefore, the busbar 10 in the embodiment of the present application is especially suitable for being used as a negative busbar.

[0028] As shown in Figure 2 and Figure 3 , in some embodiments, the infiltration hole 20 is a strip-shaped hole extending radially along the busbar 10. The interval L1 between the first hole edge 210 and the center of the busbar 10 can be set to 0.2R1, 0.3R1, 0.4R1, 0.5R1, or any value between any two of them.

[0029] In some embodiments, the infiltration hole 20 can also be set as a fan-shaped hole, a circular hole, a square hole, an elliptical hole, etc. The shape of the infiltration hole 20 can be reasonably selected based on actual infiltration requirements.

[0030] In some embodiments, the radius R1 of the busbar 10 can be specifically selected based on the model of the battery cell, so that the busbar 10 can be arranged on the negative electrode of the battery cell. For example, the radius R1 of the busbar 10 can be set to 16 mm. At this time, the interval L1 between the first hole edge 210 and the center of the busbar 10 can be set in the range of 3.2 mm to 8 mm. For example, the interval L1 between the first hole edge 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 any two of them.

[0031] As shown in Figure 3 , in some embodiments, the first hole edge 210 is set as an arc shape and has the same center as the busbar 10. The radius of the first hole edge 210 is R2, which satisfies: 0.2R1≤R2≤0.5R1.

[0032] It can be understood that, based on setting the first hole edge 210 as an arc shape and limiting the radius of the first hole edge 210, the interval between the first hole edge 210 and the center of the busbar 10 can be limited, thereby ensuring that the busbar 10 has sufficient area to form the boss 30.

[0033] The first hole edge 210 has the same center as the busbar 10. When the infiltration hole 20 is punched and formed, the center of the busbar 10 can be used as a reference to realize rapid punching positioning.

[0034] The radius R2 of the first hole edge 210 can be set to 0.2R1, 0.3R1, 0.4R1, 0.5R1, or any value between any two of them.

[0035] For example, when the radius R1 of the busbar 10 is set to 16 mm, the radius R2 of the first hole edge 210 can be set to a range of 3.2 mm to 8 mm. For example, the radius R2 of the first hole edge 210 can be set to 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or any value between any two of them.

[0036] As shown in FIG. 1, in some embodiments, the first hole edge 210 can also be set to a straight line shape, a wavy shape, an elliptical shape, or other shapes, as long as the first hole edge 210 has sufficient spacing from the center of the busbar 10. Figure 2

[0037] Figure 2 Figure 3 As shown in FIG. 1, in some embodiments, the infiltration hole 20 also has a second hole edge 220 away from the center of the busbar 10. The spacing between the second hole edge 220 and the edge of the busbar 10 is L2. It is satisfied that 0.25R1≤L2≤0.5R1.

[0038] It can be understood that the second hole edge 220 can define the position of the infiltration hole 20 near the edge of the busbar 10. Based on setting the spacing L2 between the second hole edge 220 and the edge of the busbar 10 to a range of 0.25R1 to 0.5R1, it is ensured that the edge area of the busbar 10 has sufficient area for edge pressing, ensuring that the infiltration hole 20 can be formed on the busbar 10 by the process of stamping.

[0039] When the spacing L2 between the second hole edge 220 and the edge of the busbar 10 is less than 0.25R1, the remaining area of the edge area of the busbar 10 is small, and at this time, the edge pressing width during stamping is insufficient, and the infiltration hole 20 cannot be formed by stamping. When the spacing L2 between the second hole edge 220 and the edge of the busbar 10 is greater than 0.5R1, the extension length of the infiltration hole 20 is short, which affects the infiltration rate of the electrolyte.

[0040] In some embodiments, the spacing L2 between the second hole 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 spacing L2 between the second hole edge 220 and the edge of the busbar 10 and the spacing L1 between the first hole 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.

[0041] ​​​For example, when the radius R1 of the manifold 10 is set to 16 mm, the distance L2 between the second hole edge 220 and the edge of the manifold 10 can be set to a range of 4 mm to 8 mm. For example, the distance L2 between the second hole edge 220 and the edge of the manifold 10 can be set to 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or any value between the two.

[0042] like Figure 3 As shown, in some embodiments, the second hole edge 220 is set to be arc-shaped and shares the same center with the manifold 10. The radius of the second hole edge 220 is R3, satisfying: 0.5R1≤R3≤0.75R1.

[0043] It is understandable that by setting the second hole edge 220 as an arc and limiting the radius of the second hole edge 220, the distance between the second hole edge 220 and the edge of the manifold 10 can be limited, thereby ensuring that there is a sufficient pressing area on the manifold 10, and ensuring that the impregnation hole 20 can be formed by the stamping process.

[0044] The second hole edge 220 and the manifold 10 are concentric. When stamping and forming the impregnation hole 20, the center of the manifold 10 can be used as a reference to achieve rapid stamping positioning.

[0045] The radius R3 of the second hole edge 220 can be set to 0.5R1, 0.6R1, 0.7R1, 0.75R1, or any value between the two.

[0046] For example, when the radius R1 of the manifold 10 is set to 16 mm, the radius R3 of the second hole edge 220 can be set in the range of 8 mm to 12 mm. For example, the radius R3 of the second hole edge 220 can be set to 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, or any value between the two.

[0047] like Figure 2 As shown, in some embodiments, the second hole edge 220 can also be set to other shapes such as straight line, wave, ellipse, etc., as long as there is sufficient distance between the second hole edge 220 and the edge of the manifold 10.

[0048] Please continue reading. Figure 3 In some embodiments, the wetting hole 20 further has a third hole edge 230 and a fourth hole edge 240 disposed opposite to each other. Both the third hole edge 230 and the fourth hole edge 240 extend radially along the manifold 10. The included angle between the third hole edge 230 and the fourth hole edge 240 is α, which satisfies: 6°≤α≤12°.

[0049] It can be understood that the included angle a between the third hole edge 230 and the fourth hole edge 240 can define the width of the infiltration hole 20. The first hole edge 210, the second hole edge 220, the third hole edge 230 and the fourth hole edge 240 are closedly connected to form the infiltration hole 20. When the included angle a between the third hole edge 230 and the fourth hole edge 240 is less than 6°, the width of the infiltration hole 20 is small, which affects the infiltration rate of the electrolyte. When the included angle a between the third hole edge 230 and the fourth hole edge 240 is greater than 12°, the infiltration hole 20 will occupy the welding area of the busbar 10 and the winding core, resulting in poor welding of the busbar 10 and the winding core.

[0050] In some embodiments, the included angle a between the third hole edge 230 and the fourth hole edge 240 can be set to 6°, 7°, 8°, 9°, 10°, 11°, 12°, or any value between any two of them.

[0051] For example, the included angle a between the third hole edge 230 and the fourth hole edge 240 can be set to 10°. When the first hole edge 210 and the second hole edge 220 are both set to be straight lines, the length of the first hole edge 210 can be set to 0.35 mm, and the length of the second hole edge 220 can be set to 1.05 mm. At this time, the width of the infiltration hole 20 near the center of the busbar 10 is 0.35 mm, and the width far from the center is 1.05 mm. When the first hole edge 210 and the second hole edge 220 are both set to be arc-shaped, the arc length of the first hole edge 210 can be set to 0.35 mm, and the arc length of the second hole edge 220 can be set to 1.05 mm. At this time, the width of the infiltration hole 20 near the center of the busbar 10 and the width far from the center can be calculated based on the positions of the first hole edge 210 and the second hole edge 220. Alternatively, when the first hole edge 210 and the second hole edge 220 are both set to be arc-shaped, the width of the infiltration hole 20 near the center of the busbar 10 can be directly set to 0.35 mm, and the width far from the center can be set to 1.05 mm.

[0052] Please continue to refer to Figure 2 and Figure 3 In some embodiments, the infiltration hole 20 extends along the radial direction of the busbar 10, and at least two infiltration holes 20 are arranged on the busbar 10. The at least two infiltration holes 20 are arranged at intervals along the circumferential direction of the busbar 10.

[0053] It can be understood that by arranging at least two infiltration holes 20 on the busbar 10, the upward infiltration rate of the electrolyte at the bottom of the battery cell can be further improved. Therefore, the liquid injection efficiency can be improved, the production cycle can be shortened, and the manufacturing cost can be reduced.

[0054] The infiltration hole 20 in the embodiment of the present application extends along the radial direction of the busbar 10, so that the infiltration hole 20 can avoid the welding wire 40 on the busbar 10, thereby ensuring that the busbar 10 has sufficient area to be welded with the winding core.

[0055] In some embodiments, the at least two infiltration holes 20 are centrally symmetrically distributed along the center of the busbar 10. In this way, the electrolyte at each position is relatively uniformly infiltrated upward, thereby ensuring the consistency and reliability of the battery.

[0056] For example, the busbar 10 can be provided with 2, 3, 4, 5, 6, 7, or 8 infiltration holes 20. As shown in FIG. 2, the busbar 10 in the embodiment of the present application is preferably provided with 8 infiltration holes 20, thereby maximizing the infiltration area and improving the infiltration rate. Figure 1

[0057] In some embodiments, the cross-sectional area of the busbar 10 is S1, and the total area of the at least two infiltration holes 20 is S2, which satisfies: 0.6%≤S2 / (S1+S2)≤13.9%.

[0058] It can be understood that the proportion of the total area S2 of the at least two infiltration holes 20 can directly reflect the size of the infiltration area. The larger the infiltration area, the faster the infiltration rate of the electrolyte. When S2 / (S1+S2) is less than 0.6%, the infiltration area is too small, which will affect the infiltration rate. When S2 / (S1+S2) is greater than 13.9%, the infiltration hole 20 will occupy too much area, which may affect the area of the middle 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 with the winding core.

[0059] 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 infiltration hole 20. The value of (S1+S2) can be directly calculated based on the radius R1 of the busbar 10.

[0060] 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 infiltration holes 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 infiltration holes 20 can be set to 10 square millimeters, 50 square millimeters, 100 square millimeters, or any value between any two of them.

[0061] In some embodiments, when the radius R1 of the busbar 10 is set to 16 millimeters, the radius R2 of the first hole edge 210 can be set to 4 millimeters, the radius of the second hole edge 220 can be set to 12 millimeters, the included angle α between the third hole edge 230 and the fourth hole edge 240 can be set to 10°, and the ratio of the total area S2 of the at least two infiltration holes 20 to the cross-sectional area S1 of the busbar 10 can be set to 11%.​

[0062] In some embodiments, a bonding wire 40 is provided on the busbar 10 between two adjacent wetting holes 20. A boss 30 is formed at the center of the busbar 10. The boss 30 is configured to be welded to the negative electrode of the battery cell. The bonding wire 40 is located on the side of the busbar 10 away from the boss 30.

[0063] It is understandable that the boss 30 of the busbar 10 is used to weld the busbar 10 to 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 weld the busbar 10 to the core inside the battery cell, thereby realizing the welding fixation and electrical connection of the busbar 10.

[0064] Please see Figure 4 In some embodiments, the busbar 10 may have a weld line 40 between every two adjacent impregnation holes 20. The weld line 40 may be configured in a serpentine pattern to ensure a sufficiently large welding area between the busbar 10 and the core.

[0065] like Figure 4 As shown, the bonding wire 40 may have a first end near the boss 30 and a second end away from the boss 30. The distance between the first end and the center of the busbar 10 is L3, satisfying: L3 ≥ 0.4R1. The distance between the second end and the center of the busbar 10 is L4, satisfying: L4 ≤ 0.8R1.

[0066] Understandably, if the distance L3 between the first end of the bonding wire 40 and the center of the busbar 10 is less than 0.4R1, the welding area between the busbar 10 and the core will be too close to the boss 30. This may cause deformation of the boss 30 during welding of the busbar 10 and the core, thus 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 bonding wire 40 and the center of the busbar 10 is greater than 0.8R1, the welding area between the busbar 10 and the core will be too close to the edge of the busbar 10, causing deformation of the edge of the busbar 10.

[0067] For example, the distance L3 between the first end of the bonding wire 40 and the center of the busbar 10 can be set to 7.5 mm. The distance L4 between the second end of the bonding wire 40 and the center of the busbar 10 can be set to 12 mm.

[0068] like Figure 4 As shown, the spacing between the opposite sides of the serpentine welding lines 40 is D, satisfying D = 1.6 mm. This ensures that the busbar 10 and the core have a sufficiently large welding area.

[0069] This application also provides a battery cell. The battery cell includes the busbar 10 as described in the foregoing embodiments.

[0070] In the embodiment of the present application, the electrolyte at the bottom of the battery cell can quickly infiltrate upward through the infiltration hole 20, thereby improving the infiltration rate of the electrolyte. Thus, the injection efficiency can be improved, the production cycle is shortened, and the manufacturing cost is reduced. Among them, based on the interval L1 between the first hole edge 210 and the center of the busbar 10 is set in the range of 0.2R1~0.5R1, it can be ensured that the central region of the busbar 10 has sufficient area to punch the boss 30, and the boss 30 is used to realize the welding between the busbar 10 and the negative electrode of the battery cell. Thus, it can be ensured that the busbar 10 and the negative electrode of the battery cell have sufficient welding area.

[0071] The embodiment of the present application also provides a battery pack. The battery pack comprises the battery cell in the foregoing embodiment.

[0072] In the embodiment of the present application, the electrolyte at the bottom of the battery cell can quickly infiltrate upward through the infiltration hole 20, thereby improving the infiltration rate of the electrolyte. Thus, the injection efficiency can be improved, the production cycle is shortened, and the manufacturing cost is reduced. Among them, based on the interval L1 between the first hole edge 210 and the center of the busbar 10 is set in the range of 0.2R1~0.5R1, it can be ensured that the central region of the busbar 10 has sufficient area to punch the boss 30, and the boss 30 is used to realize the welding between the busbar 10 and the negative electrode of the battery cell. Thus, it can be ensured that the busbar 10 and the negative electrode of the battery cell have sufficient welding area.

[0073] The above has carried on the detailed introduction to the embodiment of the present application, the principle and implementation mode of the present application have been described in this paper by applying specific examples, the above embodiment is only used to help understanding the method of the present application and its core idea;At the same time, 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-mentioned embodiment is not used to limit the present application.

Claims

1. A busbar characterized by, The busbar is provided with an infiltration hole, the infiltration hole has a first hole edge close to the center of the busbar, the distance between the first hole 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 hole edge is arranged in an arc shape and shares the center with the busbar.

3. The busbar of claim 1, wherein The infiltration hole also has a second hole edge away from the center of the busbar, the distance between the second hole 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 hole 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 infiltration hole also has a third hole edge and a fourth hole edge arranged oppositely, the third hole edge and the fourth hole edge both extend along the radial direction of the busbar, and the included angle between the third hole edge and the fourth hole 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 infiltration hole extends along the radial direction of the busbar, at least two infiltration holes are arranged on the busbar, and the at least two infiltration holes 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 infiltration holes is S2, and 0.6%≤S2 / (S1+S2)≤13.9% is satisfied.

8. The busbar of claim 6, wherein, The busbar is provided with a welding line between adjacent two infiltration holes, the center of the busbar is provided with a boss configured to be welded with a negative electrode of a battery cell, and the welding line is located on a side away from the boss.

9. An electric cell characterized by The battery cell includes the busbar as claimed in any one of claims 1-8.

10. A battery pack, characterized by, The battery cell includes the busbar as claimed in claim 9.

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