Flexible package lithium cell and method of processing the same

Abstract

The invention provides a soft package lithium cell comprising: a positive electrode sheet connected with a positive electrode unit and a negative electrode sheet cascade connected with a negative electrode unit that are coiled to from a coiling core, a soft compound package membrane wrapped outside the coiling core. The positive electrode unit and the negative electrode unit respectively extend from a top end of the coiling core. The projection of the positive electrode unit and the negative electrode unit extending is respectively provided with an electrode unit glue. An upper and a lower end of the electrode unit glue are exposed from a top flange and a bottom flange of a heat sealing region at top of the soft package lithium cell; spacers are coated on the positive electrode unit and the negative electrode unit. A groove hole where the positive electrode unit and the negative electrode unit penetrate is arranged in middle of the spacer. The invention further provides a method to machine the soft package lithium cell. Additionally arranging a spacer when bending the heat sealing region at top of the lithium cell is capable of effectively protecting the coiling core structure and preventing squeeze when bending, which enables the electrode sheet to penetrate the membrane to lead to short-circuit in the lithium cell so as to ensure safety of the cell; the invention further prevents corrugation and inclination of bending line at top, which protects shape of the lithium cell.

Description

technical field [0001] The invention belongs to the field of lithium battery production, and in particular relates to a soft package lithium battery and a processing method thereof. Background technique [0002] At present, among various types of lithium batteries, soft-pack lithium batteries are widely used in mobile digital products due to their advantages of high energy density, light weight and self-defined shape. The outer packaging of soft-packaged batteries is a soft composite packaging film. In actual use, it is very easy to scratch the surface, especially when bending the heat-sealed welding area (3-6mm) of soft-packaged lithium batteries, it is easier to damage the heat. The appearance of the weld seal, such as wrinkling, cracking, etc. At present, the heat-sealed welding area on the top of the soft-packed battery is horizontal to the position of the inner winding core. When the soft-packed battery is actually used, the heat-sealed welding area on the top tab of t...

AI Technical Summary

Problems solved by technology

However, under the current structure of soft-packaged lithium batteries, bending the top tab of the lithium battery and heat-sealing the welding position can easily lead to poor appearance of the soft-packaged lithium battery, and can easily cause a short circuit inside the battery, which in turn leads to swelling and scrapping of the soft-packaged lithium battery.

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