On-line type pole piece bag-making and laminating process and bag-making and laminating production line thereof

Abstract

The invention discloses an on-line type pole piece bag-making and laminating process and a bag-making and laminating production line thereof. The process comprises the following process steps of: S1, surface thermal compounding: bonding two diaphragms with belt-shaped structures onto the surfaces of single pole pieces continuously conveyed forwards in a thermal compounding manner from the two sides of the pole pieces; S2, edge thermal compounding to form a bag: extending the diaphragms in the step S1 to the outer edges of the single pole pieces, mutually bonding the diaphragms on the two sides of the outer edges of the pole pieces, and wrapping the single pole pieces into a continuous pole piece bag; S3, bag making: cutting the continuous pole piece bag in the step S2 into single pole piece bags; and S4, piece bag laminating and manufacturing: aligning the single pole piece bags in the step S3 and single pole pieces with opposite properties through a CCD (Charge Coupled Device), and laminating in a staggered manner to obtain a battery cell. According to the invention, the problem of wrinkling of the diaphragms is solved, the position precision between the positive and negative pole pieces is ensured, the single diaphragm alignment process of the traditional lamination is simplified by adopting the diaphragms larger than the pole pieces, the lamination efficiency is effectively improved, combustion caused by short circuit is reduced, and the safety coefficient of a battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an online pole piece bag-making and laminating process and a bag-making and laminating production line in the field of lithium-ion power batteries. Background technique [0002] As the country vigorously promotes the development of new energy, the demand for lithium-ion power batteries in all walks of life is increasing day by day. In the composition structure of lithium-ion power batteries, the battery core is its core component. become. The structure of the battery cell includes multiple positive and negative plates stacked up and down staggered, and the positive and negative plates are isolated and insulated by a diaphragm. [0003] At present, the manufacturing process of the battery cell includes two methods of strip lamination and single-piece lamination according to the different diaphragm insertion process, that is, continuous diaphragm and single-piece diaphragm lam...

AI Technical Summary

Problems solved by technology

However, in the unit body manufacturing process of this manufacturing process, the unit body is made using a blind stacking method, that is, the positive and negative electrodes are synchronously transported in a straight line and laminated, and the positive and negative electrodes arranged up and down lack alignment, which cannot To ensure the accuracy of the positive and negative electrodes in the unit, at the same time, the current situation is that if the alignment process is added to the positive and negative electrodes arranged above and below each piece, it will take the same time as the existing single-chip stacking process, and it will also consume a lot of time. Lamination efficiency cannot be guaranteed

In addition, the side parts of the positive and negative electrodes of the cells after the lamination of all the above manufacturing processes are open structures. Since the outside of the laminated cells is filled with electrolyte, the positive and negative electrodes of this open structure The outer edge of the chip is in contact with the electrolyte around the outside, and there is a potential safety hazard of short circuit and flammability during actual use.

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