T-shaped tab in cylindrical battery, forming equipment of T-shaped tab and cylindrical battery

Abstract

The utility model belongs to the field of battery production, and particularly relates to a T-shaped tab in a cylindrical battery, forming equipment of the T-shaped tab and the cylindrical battery. A through central hole is formed in the center of the cylindrical battery, the T-shaped tab comprises a tab bending area and a roll core internal area, the width of the tab bending area is larger than the diameter of the central hole of the cylindrical battery, and the width of the roll core internal area is smaller than or equal to the radius of the central hole of the cylindrical battery. The width of the T-shaped tab in the inner area of the roll core is smaller, so that the abnormality that the roll core is deformed by winding or the pole piece is broken by pulling can be avoided; the width of the tab bending area is large, so that the tab can completely cover the winding needle hole, and the abnormal condition of insufficient welding caused by the fact that a welding needle cannot be welded on the tab is avoided. According to the tab forming equipment provided by the utility model, continuous production of T-shaped tabs can be realized, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of battery production, and particularly relates to a T-shaped tab in a cylindrical battery, a forming device thereof, and a cylindrical battery. Background Art

[0002] For existing cylindrical batteries, the winding mandrel diameter generally used is 3.5 mm. After the winding core is wound, a central hole will be left to facilitate bottom welding and electrolyte infiltration during liquid injection. When putting the gasket after winding into the shell, the two tabs of the negative electrode need to be bent towards the central hole respectively so that the welding needle can pass through the winding central hole to weld between the two negative tabs and the steel shell; generally, the width of the inner tab in the production process is 3 or 4 mm, and these two specifications of tabs have different disadvantages: when producing with a tab width of 3 mm or less than 3 mm, because the width of the tab is the same as or smaller than the width of the battery central hole, it is very easy for the tab not to cover the central hole after bending, and it is very easy to have the phenomenon that the welding needle cannot weld to the tab or only welds to one tab during welding, resulting in the abnormal defect of poor soldering at the bottom of the battery, showing the high internal resistance defect of the battery; when using a tab with a width of more than 3 mm, the winding core is very easy to deform or cause abnormal fracture of the electrode sheet during winding. The reason is that the winding mandrel is circular, while the tab is flat and hard, and it is easy to generate sharp corners during winding, resulting in the winding core not being round enough, or the sharp corners being easy to break the electrode sheet. Summary of the Utility Model

[0003] In order to solve the problems existing in the prior art, the utility model provides the following technical solutions:

[0004] The first object of the utility model is to provide a T-shaped tab for a cylindrical battery. There is a through central hole in the center of the cylindrical battery. The T-shaped tab includes a tab bending area and an area inside the winding core. Among them, the width of the tab bending area is greater than the diameter of the central hole of the cylindrical battery, and the width of the area inside the winding core is less than or equal to the radius of the central hole of the cylindrical battery.

[0005] Another object of the utility model is to provide a forming device for preparing the above T-shaped tab. The forming device for the T-shaped tab includes a tab feeding mechanism and a punching and forming mechanism; the tab feeding mechanism is connected to the punching and forming mechanism through a material roll supporting mechanism, and the material roll supporting mechanism extends from the tab feeding mechanism in the direction of the electrode sheet running.

[0006] Preferably, the punching and forming mechanism includes a punching upper die, a punching lower die, and a punching device. The punching upper die and the punching lower die are arranged opposite to each other. A punching device is arranged on the punching upper die, and a punching blade is arranged on the punching device. The punching blade extends towards the punching lower die.

[0007] Preferably, one end of the punching and forming mechanism connected to the tab feeding mechanism is the feeding end, and the other end is the discharging end. The discharging end is directly connected to the tab welding mechanism to weld the formed T-shaped tab.

[0008] Another object of the present invention is to provide a cylindrical battery including the above-mentioned T-shaped tab.

[0009] Preferably, the cylindrical battery is a lithium-ion battery and / or a sodium-ion battery.

[0010] Compared with the prior art, the advantages of the present invention are as follows:

[0011] (1) The width of the T-shaped tab provided by the present invention in the inner area of the core is small, which can avoid abnormal situations such as the winding deformation of the core or the breakage of the pole piece being pulled. The tab in the tab bending area is large, so that the tab can completely cover the winding needle hole, thereby avoiding abnormal situations such as the soldering needle not reaching the tab and resulting in false soldering.

[0012] (2) The tab forming device provided by the present invention can realize the continuous production of T-shaped tabs, improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a conventional tab and a T-shaped tab.

[0014] Figure 2 It is a schematic diagram of the welding of a conventional tab and a T-shaped tab.

[0015] Figure 3 It is a diagram of a T-shaped tab forming device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention will be further described in detail below with reference to the embodiments, but the embodiments of the present invention are not limited thereto. Those not specified in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. Those reagents or instruments not specified by the manufacturer can be obtained as conventional products through commercial purchase.

[0017] Such as Figure 1 、 2As shown in the figure, 3 is the tab welding area, 4 is the core center hole area of the cylindrical battery, and 5 is the cylindrical battery. For the existing cylindrical battery, the tab needs to be bent from the cylindrical side of the cylindrical battery towards the center hole for welding. When the tab width is too large, it is easy to cause deformation of the cylindrical battery and generate sharp corners during welding; when the tab width is too small, the center hole cannot be covered during welding, easily causing a virtual welding phenomenon. To solve this problem, the present utility model provides a T-shaped tab, including a tab bending area 1 and a core internal area 2. Among them, the width of the tab bending area 1 is greater than the width of the core internal area 2, and the width of the tab bending area 1 is greater than the diameter of the center hole of the cylindrical battery. After the tab is bent, the tab bending area 1 is sufficient to completely cover the center hole of the cylindrical battery to prevent virtual welding; the width of the core internal area 2 is less than or equal to the radius of the center hole of the cylindrical battery, and it will not cause deformation of the core of the cylindrical battery during welding.

[0018] The present utility model also provides a forming device for the T-shaped tab, which can realize the continuous production of the T-shaped tab and improve the production efficiency. As Figure 3 shown in the figure, the forming device for the T-shaped tab includes a tab feeding mechanism 10 and a punching and forming mechanism. Among them, the tab feeding mechanism 10 is connected to the feeding end of the punching and forming mechanism through a coil support mechanism, and the coil support mechanism extends from the tab feeding mechanism in the direction of the strip running of the tab.

[0019] One end of the punching and forming mechanism connected to the tab feeding mechanism is the feeding end, and the other end is the discharging end. The punching and forming mechanism includes a punching upper die 6, a punching lower die 7, and a punching device 8. The punching upper die and the punching lower die are arranged oppositely, and a punching device 8 is arranged on the punching upper die. A punching blade is arranged on the punching device 8, and the punching blade extends towards the punching lower die. When the tab strip passes through the punching and forming mechanism, the punching device moves downward under the drive of the cylinder to cut out the T-shaped tab 9.

[0020] The cut T-shaped tab is discharged from the discharging end of the punching and forming mechanism, and the discharging end of the punching and forming mechanism is directly connected to the tab welding mechanism to weld the formed T-shaped tab.

[0021] The above embodiments only represent the preferred implementation modes of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, according to the technical solutions and concepts described above, various other corresponding changes and deformations can also be made, and all these changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims

1. A T-shaped tab in a cylindrical battery, characterized in that, The cylindrical battery has a through central hole. The T-shaped tab includes a tab bending area and an area inside the core. Among them, the width of the tab bending area is greater than the diameter of the central hole of the cylindrical battery, and the width of the area inside the core is less than or equal to the radius of the central hole of the cylindrical battery.

2. The forming device for the T-shaped tab according to claim 1, characterized in that The forming device of the T-shaped tab includes a tab feeding mechanism and a punching and forming mechanism; the tab feeding mechanism is connected to the punching and forming mechanism through a coil support mechanism, and the coil support mechanism extends from the tab feeding mechanism in the direction of the tab running of the tab.

3. The forming device for the T-shaped tab according to claim 2, characterized in that, The punching and forming mechanism includes a punching upper die, a punching lower die and a punching device. The punching upper die and the punching lower die are arranged opposite to each other. A punching device is arranged on the punching upper die, and a punching blade is arranged on the punching device, and the punching blade extends towards the punching lower die.

4. The forming device for the T-shaped tab according to claim 2, characterized in that, One end of the punching and forming mechanism connected to the tab feeding mechanism is the feeding end, and the other end is the discharging end. The discharging end is directly connected to the tab welding mechanism to weld the formed T-shaped tab.

5. A cylindrical battery, characterized in that, It includes the T-shaped tab described in claim 1.

6. The cylindrical battery according to claim 5, wherein The cylindrical battery is a lithium-ion battery and / or a sodium-ion battery.

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