Square lithium battery lamination machine and lamination technology

Abstract

The invention discloses a square lithium battery lamination machine and a lamination technology used for solving the problem of a poor lamination effect in the prior art. The square lithium battery lamination machine comprises a first diaphragm release mechanism, a first positive plate release part, a second diaphragm release mechanism, a first negative plate release part, a third diaphragm release mechanism, a positive plate heat sealing part, a folding part, a second negative plate release part, a second positive plate release part and an arrangement part which are sequentially arranged from an initializing end to a terminating end, wherein main plates of positive plates and negative plates superpose and electrode parts do not superpose, and the positive plates and the negative plates are fixed between three diaphragms and discontinuously and uniformly distributed to form a diaphragm strip; and a laminated sheet is finally formed through folding. By adopting a Z-shaped folding mode, the winding stress is avoided, the product uniformity is good, an assembly operation mode is better in uniformity than a traditional lamination mode, and by adopting double-layer heat sealing, the efficiency is high.

Description

technical field [0001] The invention relates to the technical field of lithium battery lamination production, in particular to a square lithium battery lamination machine and lamination process. Background technique [0002] Soft-pack batteries (also known as "polymer batteries") are widely used in some small digital products. [0003] The structure of the current soft-packed battery includes two types: laminated structure and wound structure. [0004] In the common laminated structure, the positive electrode sheet, diaphragm, and negative electrode sheet are superimposed and formed, and the diaphragm is disconnected. In the laminated structure of this structure, the diaphragm is usually cut into a sheet slightly larger than the electrode sheet. Then stack them layer by layer. There is a problem that lithium ions bypass the diaphragm around the diaphragm, which has a great impact on the charge and discharge performance of the battery cell. [0005] In the common winding st...

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Problems solved by technology

[0004] In the common laminated structure, the positive electrode sheet, diaphragm, and negative electrode sheet are superimposed and formed, and the diaphragm is disconnected. In the laminated structure of this structure, the diaphragm is usually cut into a sheet slightly larger than the electrode sheet. Then stack them layer by layer. There is a problem that lithium ions bypass the diaphragm around the diaphragm, which has a great impact on the charge and discharge performance of the battery cell.

[0005] In the common winding structure, the positive electrode sheet, separator and negative electrode sheet are continuous long strips, and the three are superimposed, and then wound around a center to form a flat structure. The winding method of this structure has winding stress, and the long-term During the application process, there will be arching and wrinkles. This phenomenon is caused by the inconsistency of the tension between the winding layers during the winding process.

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