Connecting piece and cylindrical battery

Abstract

The utility model provides a connecting piece and a cylindrical battery, and belongs to the field of lithium batteries, the connecting piece comprises a first piece body and a second piece body which are stacked up and down; the two wing parts are symmetrically arranged on the two sides of the main body part, and the connecting parts of the wing parts and the main body part are bent along a straight line; the outer contour edges, far away from the bent parts, of the two adjacent wing parts of the first sheet body and the second sheet body are connected, and the connecting part of the two wing parts is bent along the straight line. According to the utility model, the two sheet bodies are overlapped and are bent and connected at the edges of the two sides, when the wing parts of the two sheet bodies are respectively bent upwards and downwards, the two sheet bodies are far away from each other, so that the connecting sheet is welded on a tab and a pole, and after the welding is finished, the two sheet bodies are pressed downwards, so that the connecting sheet can be put into a shell; and the to-be-welded area can be assembled in the shell without being folded for multiple times, so that the production efficiency is improved, and the reject ratio is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially relates to a connecting piece and cylindrical battery. BACKGROUND

[0002] The cylindrical battery connecting piece is usually connected with the electrode lug of the battery cell and is mainly used for collecting and transmitting the current generated in the battery. Specifically, the connecting piece is used for collecting the current generated in the battery, avoiding the current loss or short circuit in the battery, and transmitting the current from the battery to the external circuit through the conductive material to realize the energy output of the battery.

[0003] At present, the cylindrical battery assembly is mainly realized by connecting the connecting piece to the current collector plate twice to realize the entry of the battery cell into the shell. Such an entry mode has low production efficiency and the bending angle is difficult to control accurately, which may cause misalignment and low entry accuracy of the battery cell into the shell, and may generate defective products. Moreover, the flat surface of the cover assembly facing the inside of the battery is inclined after the connecting piece is bent, which is not conducive to the current flow. Chinese patent CN113206328A discloses a laminated lithium battery top cover, in which the connecting piece is connected to the electrode lug through the side surface. However, such a structure increases the thickness of the winding core of the battery, which requires a larger battery shell to accommodate the winding core and reduces the efficiency of the battery. SUMMARY

[0004] Therefore, the utility model provides a connecting piece and a cylindrical battery to solve the problem that the connecting piece needs to be bent twice to connect the current collector plate to realize the entry of the battery cell into the shell, the bending angle is difficult to control accurately, misalignment is caused, and the entry accuracy of the battery cell into the shell is low.

[0005] The technical scheme of the utility model is as follows: the utility model provides a connecting piece, which comprises a first piece body and a second piece body, and the first piece body and the second piece body are stacked vertically; wherein the first piece body and the second piece body each comprise a main body part, two wing parts are symmetrically arranged on both sides of the main body part, and the connecting part of the wing part and the main body part is bent along a straight line; the outer contour edges of the two adjacent wing parts of the first piece body and the second piece body away from the bent part are connected, and the connecting part of the two wing parts is also bent along a straight line.

[0006] On the basis of the above technical scheme, preferably, the first piece body and the second piece body are the same in size and shape, and the surfaces of the two main body parts of the first piece body and the second piece body are arranged in parallel.

[0007] More preferably, the first piece body and the second piece body are symmetrically provided with flat edges on both sides, the extension direction of the flat edge is parallel to the bending line of the connecting part of the wing part and the main body part, and the two adjacent wing parts of the first piece body and the second piece body are connected and bent along the flat edge.

[0008] More preferably, the length of the flat edge is not greater than the radius of the first piece body.

[0009] Further preferably, the first sheet and the second sheet are both circular.

[0010] Further preferably, the main body part and the wing part of the first sheet and the second sheet are all the same in size and shape.

[0011] On the basis of the above technical scheme, preferably, the thickness of the first sheet or the second sheet is not greater than 1 mm.

[0012] On the basis of the above technical scheme, preferably, the first sheet and the second sheet are both circular.

[0013] On the basis of the above technical scheme, preferably, the first sheet and the second sheet are both circular.

[0014] The connecting sheet and the cylindrical battery of the present application have the following beneficial effects compared with the prior art:

[0015] (1) In the present application, two sheets are arranged in overlap and are connected by bending at the two side edges. When the wings of the two sheets are bent upward and downward respectively, the two sheets are moved away from each other so as to weld the connecting sheet to the tab and the pole. After welding, the two sheets are pressed downward to realize the entry into the shell. The welding area does not need to be folded multiple times to realize the entry into the shell, thereby improving the production efficiency and reducing the defective rate.

[0016] (2) The main body part between the two wings is welded to the tab or the pole, which can ensure the contact area of the connecting sheet and the tab end and reduce the production cost. The connecting sheet does not need to be bent multiple times, which is simple to operate and saves production time. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 It is a perspective view of the connecting sheet of the present application;

[0019] Figure 2 It is a perspective view of the cylindrical battery of the present application;

[0020] Figure 3 is a top view of the connecting sheet of the utility model;

[0021] Figure 4 is a side view of the connecting sheet of the utility model.

[0022] In the figure: 1, first sheet body; 11, main body part; 12, wing part; 101, flat edge; 102, through hole; 2, second sheet body; 3, roll core; 301, center hole; 4, cover plate; 41, pole column. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below, 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 protection scope of the utility model.

[0024] As Figure 1 shown, the utility model relates to a kind of connecting sheet, including first sheet body 1 and second sheet body 2, first sheet body 1 and second sheet body 2 all include main body part 11 and wing part 12.

[0025] Wherein, first sheet body 1 and second sheet body 2 are stacked up and down. The second sheet body 2 in the lower part is used to connect with the pole lug end, similar to the current current collecting disc;The first sheet body 1 in the upper part is used to connect with the pole column end, similar to the current connecting sheet.

[0026] Main body part 11 is the welding area of first sheet body 1 or second sheet body 2 with pole lug end or pole column end.

[0027] Two wing parts 12 are symmetrically arranged on the two sides of main body part 11, and the connecting part of wing part 12 and main body part 11 is bent along a straight line;The wing part 12 of first sheet body 1 is bent upwards, and the wing part 12 of second sheet body 2 is bent downwards, so that the adjacent two wing parts 12 of first sheet body 1 and second sheet body 2 are connected away from the outer contour edge of the bending part. The connecting part of the two wing parts 12 is also bent along a straight line. At this time, first sheet body 1 and second sheet body 2 form a structure similar to spring. When the current collecting disc, i.e. second sheet body 2, is welded together with the flattened pole lug end, the wing parts 12 of first sheet body 1 and second sheet body 2 are bent upwards and downwards respectively, so that first sheet body 1 and second sheet body 2 are separated and away from each other. After the main body part 1 of second sheet body 2 is welded with the flattened pole lug side, only need to press first sheet body 1 slightly downwards, so that first sheet body 1 and second sheet body 2 overlap and fit closely and into the shell assembly. Therefore, the connecting sheet does not need to be bent twice to realize the assembly into the shell.

[0028] InFigure 1 In a preferred embodiment shown, the first sheet 1 and the second sheet 2 are the same in size and shape, so that when the first sheet 1 is pressed down to make the first sheet 1 and the second sheet 2 overlap closely, the first sheet 1 and the second sheet 2 can be accurately put into the shell, and at the same time, the first sheet 1 and the second sheet 2 both have sufficient welding area to be welded with the pole end or the tab end; the surfaces of the two main body parts 11 of the first sheet 1 and the second sheet 2 are arranged in parallel, so that after the connecting sheet is bent, the plane of the cover plate assembly towards the inside of the battery is a horizontal plane rather than an inclined plane.

[0029] In Figure 1 In a preferred embodiment shown, the first sheet 1 and the second sheet 2 are both symmetrically provided with flat edges 101 on two sides, the extension direction of the flat edge 101 is parallel to the bending line of the connecting part of the wing part 12 and the main body part 11, and the two adjacent wing parts 12 of the first sheet 1 and the second sheet 2 are connected and bent along the flat edge 101. The flat edge 101 ensures that the first sheet 1 and the second sheet 2 can be bent along a straight line, avoiding the generation of protrusions during the bending process to affect the entry of the connecting sheet into the shell.

[0030] In Figure 3 In a preferred embodiment shown, the length of the flat edge 101 is not greater than the radius of the first sheet 1. The longer the length of the flat edge 101, the closer the flat edge 101 is to the connecting part of the main body part 11 and the wing part 12, resulting in a smaller width of the wing part 12. The wing part 12 with a smaller width will cause a smaller distance between the first sheet 1 and the second sheet 2 after being bent, thereby hindering the welding of the main body part 11 with the tab end or the pole end.

[0031] In Figure 3 In a preferred embodiment shown, the first sheet 1 and the second sheet 2 are both circular, and the circular shape has the highest space utilization, thereby ensuring that the area of the main body part 11 is relatively large, so that the first sheet 1 and the second sheet 2 have sufficient welding area; at the same time, the area of the wing part 12 is also relatively large, ensuring the structural strength of the wing part 12.

[0032] In Figure 3 In a preferred embodiment shown, the main body part 11 and the wing part 12 of the first sheet 1 and the second sheet 2 are the same in size and shape, which is conducive to reducing the production difficulty of the connecting sheet.

[0033] In Figure 4 In a preferred embodiment shown, the thickness of the first sheet 1 or the second sheet 2 is not greater than 1 mm, avoiding the increase of the thickness of the battery due to the large overall thickness of the connecting sheet.

[0034] As Figure 1 shown, in combination Figure 2 with the foregoing, the cylindrical battery of the utility model also comprises a winding core 3 and a cover plate 4.

[0035] Among them, the core 3 is cylindrical, and the end face of the core 3 facing the connecting piece is provided with a tab. The tab can adopt a full tab flattening structure.

[0036] A terminal post 41 is inserted through the center of the cover plate 4, and the inner end of the terminal post 41 is inserted into the cylindrical battery.

[0037] The connecting piece is disposed between the core 3 and the cover plate 4. The main body 11 of the first piece 1 is welded to the pole post 41, and the main body 11 of the second piece 2 is welded to the pole lug of the core 3.

[0038] exist Figure 3 In a preferred embodiment shown, a central hole 301 is provided in the center of the core 3. A central pin is typically inserted through the central hole 301. The core 3 is tightly wound around the central pin, and the end of the central pin is connected to the pole post 41. Its function is to conduct heat out of the core 3 to achieve effective heat dissipation. A through hole 102 is provided on the surface of the main body 11. The through hole 102 is aligned with the central hole 301 and avoids the central pin.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tab, characterized in that The utility model relates to a kind of connecting sheet, including: First sheet (1) and second sheet (2), upper and lower layer are stacked; Wherein, the first sheet (1) and second sheet (2) are all included, Main body (11); Two wing parts (12) are symmetrically arranged on the two sides of the main body (11), and the connecting part of the wing part (12) and the main body (11) is bent along a straight line; The outer contour edge of the adjacent two wing parts (12) of the first sheet (1) and the second sheet (2) is connected away from the bending part, and the connecting part of the two wing parts (12) is also bent along a straight line.

2. A web according to claim 1, wherein: The first sheet (1) and the second sheet (2) are the same in size and shape, and the surfaces of the two main bodies (11) of the first sheet (1) and the second sheet (2) are arranged in parallel.

3. A web according to claim 2, wherein: The first sheet (1) and the second sheet (2) are both symmetrically provided with flat edges (101) on both sides, the extension direction of the flat edge (101) is parallel to the bending line of the connecting part of the wing part (12) and the main body (11), and the two adjacent wing parts (12) of the first sheet (1) and the second sheet (2) are connected and bent along the flat edge (101).

4. A web according to claim 3, wherein: The length of the flat edge (101) is not greater than the radius of the first sheet (1).

5. A web according to claim 2, wherein: The first sheet (1) and the second sheet (2) are both circular.

6. A web according to claim 2, wherein: The main body (11) and the wing part (12) of the first sheet (1) and the second sheet (2) are the same in size and shape.

7. A web according to claim 1 wherein: The thickness of the first sheet (1) or the second sheet (2) is not greater than 1mm.

8. A cylindrical battery characterized by: The connecting sheet of any one of claims 1 to 7 further comprises a winding core (3) and a cover plate (4); The connecting sheet is arranged between the winding core (3) and the cover plate (4), the end surface of the winding core (3) towards the connecting sheet is provided with a tab, the cover plate (4) is provided with a pole column (41) in the center, and the main body (11) is connected with the tab or the pole column (41).

9. The cylindrical battery of claim 8, wherein: The winding core (3) is provided with a center hole (301) in the center, and the main body (11) is provided with a through hole (102) on the surface, and the through hole (102) is aligned with the center hole (301).

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