Soft package cylindrical battery tab

Abstract

The utility model discloses a soft package cylindrical battery tab, and relates to the field of battery tabs, the soft package cylindrical battery tab comprises two T-shaped tabs, each T-shaped tab comprises a round tab and a square tab, the round tab is in a disc shape, the square tab is in a square plate shape, the square tab is fixed on the top surface of the round tab, and the round tab is fixed on the top surface of the square tab. Two layers of tab glue are arranged on each of the two surfaces of the square tab, and a roll core is welded on the opposite surfaces of the two round tabs. According to the utility model, the T-shaped tab is arranged, and the circular tab below the T-shaped tab can well cover the battery cell and increase the contact area with the battery cell, so that the current density of the battery cell is improved, the current flowing area is increased, and larger charge and discharge current can be borne.

Description

Technical Field

[0001] The utility model relates to the field of battery tabs, in particular to a soft-pack cylindrical battery tab. Background Art

[0002] Lithium-ion batteries are widely used in power, energy storage, and consumer electronics due to their high energy density, low self-discharge, no memory effect, high safety, and good rate performance. There are also many types of lithium-ion batteries, which can be distinguished by shape (square, cylindrical, button) and packaging material (steel shell, aluminum shell, soft pack). Compared with cylindrical batteries, soft-pack batteries have a simpler process and lower cost. Therefore, soft-pack cylindrical batteries occupy a certain share in the lithium-ion battery market. Currently, the mainstream cylindrical tab extraction method is single-tab or double-tab extraction, and the electrode sheet mostly adopts an intermittent coating method, and the tabs are welded at the blank area of the material area. This tab extraction method affects the rate performance and cycle performance of the battery. In view of the above situation, there is an urgent need for a battery tab to solve this problem. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a soft-pack cylindrical battery tab to solve the problem that the current mainstream cylindrical tab extraction method is single-tab or double-tab extraction, the electrode sheet mostly adopts an intermittent coating method, and the tabs are welded at the blank area of the material area, and this tab extraction method affects the rate performance and cycle performance of the battery as mentioned in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A soft-pack cylindrical battery tab includes two T-shaped tabs. Both of the two T-shaped tabs include a circular tab and a square tab. The square tab is fixed on the top surface of the circular tab. Two layers of tab glue are provided on both sides of the square tab. A core is commonly welded on the opposite side of the two circular tabs.

[0005] Preferably, the core includes a positive electrode sheet, a separator disposed outside the positive electrode sheet, and a negative electrode sheet disposed outside the separator. The positive electrode sheet, the separator, and the negative electrode sheet are wound in layers, and pores are provided on the positive electrode sheet, the separator, and the negative electrode sheet.

[0006] Preferably, the core and the T-shaped tabs are coated with an aluminum-plastic inner membrane.

[0007] Preferably, one side of the circular tab is provided with a plurality of welding areas, and the plurality of welding areas are arranged in a circular array.

[0008] Preferably, the top surface of the circular tab is provided with a plurality of liquid injection holes, and the plurality of liquid injection holes communicate with the pores of the core.

[0009] Preferably, an outer aluminum-plastic film is provided around the inner aluminum-plastic film. One end of the outer aluminum-plastic film is bonded to the tab glue, and the other end of the outer aluminum-plastic film is welded to the inner aluminum-plastic film.

[0010] The technical effects and advantages of the present utility model: The circular tab under the T-shaped tab of the present utility model can well cover the battery cell, increasing the contact area with the battery cell, thereby improving the current density of the battery cell, increasing the area through which the current flows, and withstanding a larger charge and discharge current. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic perspective view of the overall structure of the present utility model.

[0012] Figure 2 is a schematic view of the partial structure of the battery cell of the present utility model.

[0013] Figure 3 is a schematic view of the T-shaped tab structure of the present utility model.

[0014] Figure 4 is a schematic front sectional view of the battery cell of the present utility model.

[0015] In the figure: 1, T-shaped tab; 11, circular tab; 12, square tab; 2, tab glue; 3, inner aluminum-plastic film; 4, welding area; 5, liquid injection hole; 6, outer aluminum-plastic film; 7, positive electrode plate; 8, separator; 9, negative electrode plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] The present utility model provides a soft-pack cylindrical battery tab as shown in Figures 1-4 which includes two T-shaped tabs 1. Both of the two T-shaped tabs 1 include a circular tab 11 and a square tab 12. The square tab 12 is fixed on the top surface of the circular tab 11. Two layers of tab glue 2 are provided on both sides of the square tab 12. The opposite sides of the two circular tabs 11 are jointly welded to the wound core;

[0018] By welding the circular tab 11 of the T-shaped tab 1 to the battery cell, the battery cell can be well covered, the current density distribution of the battery cell can be improved, the wider tab increases the current-carrying area, and a larger charge and discharge current can be withstood, thereby improving the rate performance and cycle performance of the battery cell.

[0019] As shown inFigure 2 As shown, the core and the T-shaped tab 1 are wrapped with an inner aluminum-plastic film 3 to be encapsulated into a cylindrical structure.

[0020] As Figure 3 shown, one side of the circular tab 11 is provided with a plurality of welding areas 4, and the plurality of welding areas 4 are arranged in a circular array. The top surface of the circular tab 11 is provided with a plurality of liquid injection holes 5, and the plurality of liquid injection holes 5 communicate with the pores of the core;

[0021] The circular tab 11 is conveniently welded to the battery cell through the welding area 4 to prevent the welding from shifting and being not tightly welded during the welding process. By providing a plurality of liquid injection holes 5, it is convenient to add battery liquid into the battery cell, and the plurality of liquid injection holes 5 make the injection of the battery liquid more complete.

[0022] As Figure 4 shown, the core includes a positive electrode sheet 7, a separator 8 disposed outside the positive electrode sheet 7, and a negative electrode sheet 9 disposed outside the separator 8. The positive electrode sheet 7, the separator 8, and the negative electrode sheet 9 are wound in layers, and pores are formed on the positive electrode sheet 7, the separator 8, and the negative electrode sheet 9. Through the remaining pores, it is convenient for the battery liquid to penetrate.

[0023] As Figure 1 and Figure 2 shown, an outer aluminum-plastic film 6 is provided outside the inner aluminum-plastic film 3. One end of the outer aluminum-plastic film 6 is bonded to the tab glue 2, and the other end of the outer aluminum-plastic film 6 is welded to the inner aluminum-plastic film 3.

[0024] The working principle of the present utility model: When packaging the battery, first roll the positive electrode sheet 7, the separator 8, and the negative electrode sheet 9 into a cylindrical core, then weld at the welding areas 4 of the corresponding circular tabs 11 at both ends of the core. Then, seal the T-shaped tab 1 at one end of the battery cell with the inner aluminum-plastic film 3. At the same time, the connection between the inner aluminum-plastic film 3 and the square tab 12 is further sealed with the tab glue 2. Then, leave the other end unencapsulated, inject battery liquid through the liquid injection holes 5 of the circular tab 11 at the other end. After the injection is completed, weld one end of the outer aluminum-plastic film 6 to the inner aluminum-plastic film 3 for sealing, and bond the other end of the outer aluminum-plastic film 6 to the tab glue 2 for sealing.

[0025] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A soft-pack cylindrical battery tab, comprising two T-shaped tabs (1), characterized in that: Both of the two T-shaped tabs (1) include a circular tab (11) and a square tab (12). The square tab (12) is fixed on the top surface of the circular tab (11). Two layers of tab glue (2) are provided on both sides of the square tab (12). A winding core is commonly welded to the opposite surfaces of the two circular tabs (11).

2. The tab of the soft-pack cylindrical battery according to claim 1, wherein: The winding core includes a positive electrode plate (7), a separator (8) disposed around the positive electrode plate (7), and a negative electrode plate (9) disposed around the separator (8). The positive electrode plate (7), the separator (8), and the negative electrode plate (9) are wound in layers. Pores are formed on the positive electrode plate (7), the separator (8), and the negative electrode plate (9).

3. A tab of a soft-pack cylindrical battery according to claim 1, characterized in that: The winding core and the T-shaped tab (1) are coated with an inner aluminum-plastic film (3).

4. A tab of a soft-pack cylindrical battery according to claim 1, characterized in that: One surface of the circular tab (11) is provided with a plurality of welding areas (4), and the plurality of welding areas (4) are arranged in a circular array.

5. A tab for a soft-pack cylindrical battery according to claim 2, wherein: The top surface of the circular tab (11) is provided with a plurality of liquid injection holes (5), and the plurality of liquid injection holes (5) communicate with the pores of the winding core.

6. A tab of a soft-pack cylindrical battery according to claim 3, characterized in that: An outer aluminum-plastic film (6) is provided outside the inner aluminum-plastic film (3). One end of the outer aluminum-plastic film (6) is bonded to the tab glue (2), and the other end of the outer aluminum-plastic film (6) is bonded to the inner aluminum-plastic film (3).

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