Convergence plate and battery

Abstract

The utility model relates to the technical field of batteries, and provides a confluence plate and a battery. Wherein the confluence plate comprises a main body and a connecting piece which are sequentially connected along a first direction, the main body is used for being welded with a tab, the connecting piece is used for being welded with an end cover assembly, and the connecting piece is provided with a liquid dispersing groove penetrating through two opposite sides in the thickness direction of the connecting piece. After the liquid injection process, the residual electrolyte on the connecting piece can drop to the main body or the battery cell through the liquid dispersing groove, the dispersing efficiency of the residual electrolyte is greatly improved, and the electrolyte attached to the surface of the connecting piece can be quickly reduced, so that the subsequent wiping work of workers is facilitated, namely, the wiping frequency is reduced, the labor consumption is reduced, and the working efficiency is improved. And the wiping time is shortened, so that the purpose of improving the production efficiency is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a busbar and a battery. Background Art

[0002] Cylindrical batteries usually use a busbar, which consists of a main body and a connecting piece connected in sequence. The main body is welded to the tab on the battery cell, and the connecting piece is welded to the pole. When the busbar is formed, it is in a flat state. When the cylindrical battery is assembled, the busbar is in a folded state. In the related technology, please combine Figure 1 , after the battery cell is placed in the shell and the main body and the tab are welded, the liquid injection process will be carried out, and the connecting piece is tilted to the main body. After the liquid injection, since there is electrolyte remaining on the connecting piece, the staff needs to use tools such as non-woven cloth to wipe the connecting piece to ensure that the subsequent connecting piece and the pole can be welded smoothly and to ensure the welding effect of the two. However, after the busbar in the related art has undergone the liquid injection process, a large amount of electrolyte will remain on the connecting piece on it, causing the staff to wipe the connecting piece repeatedly, which increases labor consumption and reduces battery production efficiency. Utility Model Content

[0003] The purpose of the present invention is to provide a busbar and a battery, aiming to solve the technical problem of low production efficiency of batteries in the related art.

[0004] In a first aspect, the present application provides a busbar comprising a main body and a connecting piece connected in sequence along a first direction, wherein the main body is used for welding with the tab, and the connecting piece is used for welding with the end cover assembly, and the connecting piece is provided with a liquid dispersion groove running through opposite sides in the thickness direction thereof.

[0005] The beneficial effect of the busbar provided by the utility model is that after the liquid injection process, the electrolyte remaining on the connecting piece can drip into the main body or the battery core through the liquid dispersion groove, which greatly improves the dissipation efficiency of the residual electrolyte and can quickly reduce the electrolyte attached to the surface of the connecting piece, thereby facilitating the subsequent wiping work of the staff, that is, reducing the number of wiping times, reducing labor consumption, and shortening the wiping time, thereby achieving the purpose of improving production efficiency.

[0006] Optionally, the bulk tank is rectangular.

[0007] Optionally, the liquid distribution trough extends along a first direction.

[0008] Optionally, the liquid distribution trough extends in a direction inclined to the first direction.

[0009] Optionally, a first welding area for welding to the end cover assembly is provided at one end of the connecting piece away from the main body, and the liquid trough is located between the main body and the first welding area.

[0010] Optionally, the connecting piece includes a bending portion and a welding portion, the main body, the bending portion and the welding portion are connected in sequence along a first direction, a first bending area is provided at one end where the bending portion is connected to the welding portion, the liquid trough is provided at the welding portion, and the first welding area is provided at one end of the welding portion away from the bending portion.

[0011] Optionally, the liquid distribution groove extends to the bent portion.

[0012] Optionally, the welding portion is further provided with fuse holes penetrating through opposite sides in its thickness direction, the fuse holes being located between the bulk liquid groove and the first welding area, and the fuse holes being plugged and fitted with the end cover assembly to position the end cover assembly.

[0013] Optionally, at least two liquid diffusion grooves are provided, and all the liquid diffusion grooves are spaced apart along the second direction, and the first direction, the second direction and the thickness direction of the connecting sheet are perpendicular to each other.

[0014] Optionally, the diameter of the main body is 16-20 mm.

[0015] Optionally, the thickness of the main body is 0.2-1 mm.

[0016] Optionally, the main body is provided with a first liquid injection hole and at least one second liquid injection hole arranged at intervals, the first liquid injection hole and the second liquid injection hole both pass through opposite sides of the main body in the thickness direction, and the first liquid injection hole is located in the center of the main body.

[0017] In the second aspect, the present application provides a battery comprising a shell, a battery cell, an end cover assembly and the above-mentioned busbar, the battery cell being accommodated in the shell, the battery cell having a pole ear, the end cover assembly comprising a cover body connected to the shell and a pole connected to the cover body, the connecting piece is plugged into and adapted to the cover body to position the cover body, and the connecting piece is welded to the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 Schematic diagram of the structure of a battery (omitting the end cover assembly) during liquid filling in the related art;

[0020] Figure 2 A schematic structural diagram of a busbar provided in an embodiment of the present utility model;

[0021] Figure 3 A schematic diagram of the structure of a battery (omitting the end cover assembly) provided in an embodiment of the present utility model during liquid filling;

[0022] Figure 4 This is a schematic structural diagram of the busbar and end cover assembly (before assembly) provided in an embodiment of the present invention.

[0023] Among them, the reference numerals in the figures are:

[0024] 100. Busbar; 10. Connector; 20. Main body;

[0025] 11. Welding part; 12. Bending part; 111. Liquid dispersing tank;

[0026] 112. First welding area; 113. Fuse hole; 114. Notch;

[0027] 121. First bending area; 122. Second bending area; 21. First injection hole;

[0028] 22. Second liquid injection hole; 23. Second welding area; 200. Battery;

[0029] 210, end cap assembly; 220, housing; 230, battery cell;

[0030] 211. Cover; 212. Pole; 2111. Positioning post. DETAILED DESCRIPTION

[0031] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0033] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0035] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0036] Please refer to Figures 1 to 4 Now, the busbar 100 and the battery 200 in the embodiment of the present invention are described.

[0037] Please refer to Figure 2 and Figure 3 The busbar 100 provided herein includes a main body 20 and a connecting piece 10 connected sequentially along a first direction. The main body 20 is used for welding to the tab, and the connecting piece 10 is used for welding to the end cap assembly 210. The connecting piece 10 is provided with a liquid dissipation groove 111 extending through opposite sides of the connecting piece 10 in the thickness direction. In this embodiment, the first direction is the length direction of the busbar 100 when in the expanded state, and the first direction is perpendicular to the thickness direction of the connecting piece 10.

[0038] After the liquid injection process, the residual electrolyte on the connecting piece 10 can drip onto the main body 20 or the battery cell 230 through the liquid dispersion groove 111, which greatly improves the dissipation efficiency of the residual electrolyte and can quickly reduce the electrolyte attached to the surface of the connecting piece 10, thereby facilitating the subsequent wiping work of the staff, that is, reducing the number of wiping times, reducing labor consumption, and shortening the wiping time, thereby achieving the purpose of improving production efficiency.

[0039] The dissipation groove 111 can extend through the connecting sheet 10 along its thickness, or it can extend through the connecting sheet 10 in a direction oblique to the thickness of the connecting sheet 10. This is not a limitation as long as the dissipation groove 111 can drain the electrolyte remaining on the connecting sheet 10. In this embodiment, the dissipation groove 111 extends through the connecting sheet 10 along its thickness, which reduces production complexity.

[0040] It is understood that the liquid dispersing tank 111 may be in a triangular, rectangular, circular or other irregular shape, which is not limited here. Figure 1 , preferably, the liquid dispersion groove 111 is rectangular. Specifically, the cross-section of the liquid dispersion groove 111 in the thickness direction of the connecting piece 10 is rectangular. Such a setting, on the one hand, facilitates processing and reduces production difficulty. On the other hand, the rectangular liquid dispersion groove 111 can flexibly set its length and width according to actual needs, and has a higher liquid dispersion efficiency while ensuring that the busbar 100 can be used normally. This is specifically reflected in: compared with the circular groove, when the width of the rectangular groove is equal to the diameter of the circular groove, the liquid dispersion efficiency can be improved by adjusting the length of the rectangular groove. If the circular groove wants to improve the liquid dispersion efficiency, it is necessary to increase the diameter. In this way, the connecting piece 10 is easy to break near the circular groove due to high heat generation, thereby resulting in the battery cell 230 and the pole 212 being unable to achieve effective electrical connection, and in severe cases, the two will also be unable to conduct. It should be noted that the width direction of the aforementioned rectangular groove is perpendicular to the first direction.

[0041] In another embodiment of this application, please refer to Figure 2 The liquid dispersing groove 111 extends along the first direction. This configuration not only makes the connecting piece 10 have higher strength and lower risk of breakage, but also has higher liquid dispersing efficiency.

[0042] In some embodiments, the liquid dissipation groove 111 may also extend in a direction inclined to the first direction. Of course, the extending direction is perpendicular to the thickness direction of the connecting sheet 10 .

[0043] In another embodiment of this application, please refer to Figure 2 The end of the connecting piece 10 away from the main body 20 is provided with a first welding area 112 for welding to the end cap assembly 210. The liquid dissipation groove 111 is located between the main body 20 and the first welding area 112. The placement of the liquid dissipation groove 111 outside the first welding area 112 ensures that the connecting piece 10 has a sufficiently large contact area with the end cap assembly 210 for welding, thereby ensuring the flow capacity of the busbar 100.

[0044] In another embodiment of this application, please refer to Figure 2The connecting piece 10 includes a bent portion 12 and a welding portion 11. The main body 20, the bent portion 12, and the welding portion 11 are sequentially connected along a first direction. A first bending area 121 is provided at the end where the bent portion 12 connects to the welding portion 11. A liquid dispersing groove 111 is provided on the welding portion 11, and a first welding area 112 is provided on the end of the welding portion 11 away from the bent portion 12. After the battery 200 is assembled, the busbar 100 is in a folded state, and the connecting piece 10 is bent at the first bending area 121. The placement of the liquid dispersing groove 111 on the welding portion 11 brings the liquid dispersing groove 111 closer to the first welding area 112, effectively improving the liquid dispersing efficiency of the welding portion 11 and thereby shortening the time required to clean the welding portion 11.

[0045] Furthermore, a second bending area 122 is provided at one end of the bending portion 12 connected to the main body 20 . When the busbar 100 is in the folded state, the connecting piece 10 is bent at the second bending area 122 .

[0046] In another embodiment of this application, please refer to Figure 2 The liquid dispersing groove 111 extends to the bent portion 12. This arrangement can further improve the liquid dispersing efficiency of the connecting piece 10.

[0047] In another embodiment of this application, please refer to Figure 2 and Figure 4 The welding portion 11 is also provided with fuse holes 113 extending through opposite sides of the welding portion 11 in the thickness direction. The fuse holes 113 are located between the bulk liquid groove 111 and the first welding region 112. The fuse holes 113 are plugged into and adapted to the end cap assembly 210 to position the end cap assembly 210. The fuse holes 113 can reduce the flow area of the corresponding area of the welding portion 11. When the current flowing through the busbar 100 is too large, the welding portion 11 will melt at the fuse holes 113 due to the high heat generated, preventing the current on the battery cell 230 from being transmitted to the pole 212, thereby improving the safety performance of the battery 200. The end cap assembly 210 has a positioning structure. By inserting the positioning structure into the fuse holes 113, the assembly accuracy of the end cap assembly 210 can be improved, thereby improving the welding quality between the end cap assembly 210 and the welding portion 11.

[0048] In another embodiment of the present application, the diameter of the fuse hole 113 is 0.5-1 mm. As an example, the diameter of the fuse hole 113 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or a range between any two of the aforementioned values, so that the end cap assembly 210 can be easily inserted into the fuse hole 113.

[0049] The number of the fuse holes 113 may be one, two, or more. When the number of the fuse holes 113 is two or more, all the fuse holes 113 are arranged at intervals along the second direction.

[0050] In another embodiment of the present application, the fuse hole 113 passes through the weld portion 11 along the thickness direction of the weld portion 11 on opposite sides. This facilitates processing and facilitates the insertion of the end cap assembly 210 into the fuse hole 113. Of course, in other embodiments, the fuse hole 113 may also pass through the weld portion 11 along a thickness direction oblique to the weld portion 11.

[0051] In another embodiment of this application, please refer to Figure 2 A notch 114 is formed on at least one side of the weld portion 11 in the second direction. Along the second direction, the projection of the notch 114 and the projection of the fuse hole 113 at least partially overlap. In other words, the notch 114 and the fuse hole 113 are spaced apart along the second direction. The notch 114 extends through the weld portion 11 along its thickness, extending along opposite sides. Together, the notch 114 and the fuse hole 113 form a weak zone in the weld portion 11, further enhancing the safety of the battery 200.

[0052] In some embodiments, please refer to Figure 2 At least two liquid dispersing grooves 111 are provided, and all liquid dispersing grooves 111 are spaced apart along the second direction, with the first direction, the second direction, and the thickness direction of the connecting piece 10 being perpendicular to each other. In this embodiment, as an example, three liquid dispersing grooves 111 are provided, which can effectively improve the liquid dispersing efficiency of the welding portion 11.

[0053] In another embodiment of the present application, the diameter of the main body 20 is 16 to 20 mm. For example, the diameter of the main body 20 can be 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, or a range between any two of the aforementioned values. Limiting the diameter of the main body 20 to the aforementioned range can, on the one hand, increase the contact area between the main body 20 and the tab, reducing the resistance of the battery 200 while improving the welding effect. On the other hand, it can prevent the main body 20 from being too large in diameter and occupying too much space.

[0054] In another embodiment of the present application, the thickness of the main body 20 is 0.2 to 1 mm. As an example, the thickness of the main body 20 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or a range between any two of the aforementioned values. Limiting the thickness of the main body 20 to the above range, on the one hand, avoids the main body 20 being too thin, resulting in the main body 20 being welded to the tab and the tab being welded through. On the other hand, it avoids the main body 20 being too thick, resulting in difficulty in welding the main body 20 to the tab, or even the problem of cold welding.

[0055] In another embodiment of this application, please refer to Figure 2The main body 20 is provided with spaced-apart first injection holes 21 and at least one second injection hole 22. Both the first injection hole 21 and the second injection hole 22 extend through opposite sides of the main body 20 in the thickness direction, with the first injection hole 21 located in the center of the main body 20. Specifically, both the first injection hole 21 and the second injection hole 22 extend through opposite sides of the main body 20 in the thickness direction. During the injection phase of the battery 200, the electrolyte flows into the battery cells 230 through the first and second injection holes 21, 22 on the manifold 100. The provision of the first and second injection holes 21, 22 effectively improves injection efficiency and electrolyte infiltration efficiency.

[0056] Of course, in some other embodiments, the first liquid injection hole 21 and the second liquid injection hole 22 may also penetrate the main body 20 along a direction inclined to the thickness direction of the main body 20 .

[0057] It is understood that the number of second injection holes 22 can be one, two, or more, depending on actual needs. In this embodiment, for example, there are four second injection holes 22, which are arranged in a circular array around the first injection hole 21. By adjusting the number of second injection holes 22, the injection efficiency can be further improved.

[0058] In the main body 20 , the area between two adjacent second liquid injection holes 22 is a second welding area 23 , and the second welding area 23 is used for welding to the tabs on the battery cell 230 .

[0059] In another embodiment of this application, please refer to Figure 2 The projection of the second injection hole 22 in the thickness direction of the main body 20 is rectangular, and the second injection hole 22 extends radially along the first injection hole 21. This arrangement can ensure that the second injection hole 22 has a higher injection efficiency while providing a larger area for welding the main body 20 to the tab, effectively improving the welding effect between the main body 20 and the tab.

[0060] In another embodiment of the present application, the connection between the main body 20 and the bent portion 12 is rounded. The battery cell 230 is housed within the housing 220. To prevent the housing 220 from becoming charged, a colloid is typically wrapped around the periphery of the battery cell 230. The rounded corners reduce the risk of the colloid being punctured.

[0061] Please refer to Figure 3The present application also provides a battery 200, which includes a shell 220, a battery cell 230, an end cover assembly 210, and the above-mentioned busbar 100. The battery cell 230 is accommodated in the shell 220, and the battery cell 230 has a tab. The end cover assembly 210 includes a cover 211 connected to the shell 220 and a pole 212 connected to the cover 211. The connecting piece 10 is plugged into and adapted to the cover 211 to position the cover 211, and the connecting piece 10 is welded to the pole 212. Specifically, a positioning post 2111 is provided on the cover 211. The positioning post 2111 is the aforementioned positioning structure. The positioning post 2111 of the cover 211 is plugged into and adapted to the fuse hole 113 of the welding portion 11, thereby realizing the busbar 100's positioning function on the end cover assembly 210. The pole 212 is welded to the first welding area 112 of the welding portion 11. Since the battery 200 adopts the aforementioned busbar 100 , the production efficiency can be effectively improved.

[0062] It should be noted that the battery 200 can be a lithium-ion battery 200, a sodium-ion battery 200, a sodium-lithium-ion battery 200, a lithium metal battery 200, a sodium metal battery 200, a lithium-sulfur battery 200, a magnesium-ion battery 200, a nickel-hydrogen battery 200, a nickel-cadmium battery 200, a lead-acid battery 200, etc., and this application does not impose any particular limitation on this.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A busbar, characterized in that: The invention comprises a main body (20) and a connecting piece (10) connected in sequence along a first direction, wherein the main body (20) is used for welding with a tab, and the connecting piece (10) is used for welding with an end cover assembly (210), and the connecting piece (10) is provided with a liquid dispersion groove (111) extending through opposite sides of the connecting piece in a thickness direction.

2. The busbar according to claim 1, wherein: The liquid dispersing tank (111) is rectangular.

3. The busbar according to claim 2, wherein: The bulk liquid trough (111) extends along the first direction; or, The liquid diffusion trough (111) extends in a direction inclined to the first direction.

4. The busbar according to any one of claims 1 to 3, characterized in that: A first welding area (112) for welding to the end cover assembly (210) is provided at one end of the connecting piece (10) away from the main body (20), and the liquid trough (111) is located between the main body (20) and the first welding area (112).

5. The busbar according to claim 4, wherein: The connecting piece (10) comprises a bending portion (12) and a welding portion (11); the main body (20), the bending portion (12) and the welding portion (11) are sequentially connected along the first direction; a first bending area (121) is provided at one end of the bending portion (12) connected to the welding portion (11); the liquid dispersing groove (111) is provided at the welding portion (11); and the first welding area (112) is provided at one end of the welding portion (11) away from the bending portion (12).

6. The busbar according to claim 5, wherein: The bulk liquid trough (111) extends to the bent portion (12); and / or, The welding portion (11) is further provided with a fuse hole (113) penetrating two opposite sides in the thickness direction of the welding portion. The fuse hole (113) is located between the bulk liquid groove (111) and the first welding area (112). The fuse hole (113) is plugged and adapted to the end cover assembly (210) to position the end cover assembly (210).

7. The busbar according to any one of claims 1 to 3, characterized in that: At least two liquid dispersion grooves (111) are provided, and all the liquid dispersion grooves (111) are spaced apart along the second direction, and the first direction, the second direction and the thickness direction of the connecting piece (10) are perpendicular to each other.

8. The busbar according to any one of claims 1 to 3, characterized in that: The diameter of the main body (20) is 16 to 20 mm; and / or, The thickness of the main body (20) is 0.2-1 mm.

9. The busbar according to any one of claims 1 to 3, characterized in that: The main body (20) is provided with a first liquid injection hole (21) and at least one second liquid injection hole (22) arranged at intervals, the first liquid injection hole (21) and the second liquid injection hole (22) both pass through two opposite sides of the main body (20) in the thickness direction, and the first liquid injection hole (21) is located at the center of the main body (20).

10. A battery, characterized in that: include: Housing (220); A battery core (230) is accommodated in the housing (220), and the battery core (230) has a tab; An end cover assembly (210) includes a cover body (211) connected to the housing (220) and a pole (212) connected to the cover body (211); According to the busbar (100) according to any one of claims 1 to 9, the connecting piece (10) is plug-fitted to the cover (211) to position the cover (211), and the connecting piece (10) is welded to the pole (212).

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