Thermal compounding manufacturing process of battery cell

Abstract

The invention discloses a thermal compounding manufacturing process of a battery cell. The thermal compounding manufacturing process comprises the following process steps that: a pole piece is manufactured, namely, single pole pieces are formed after a pole piece belt with a belt-shaped structure is subjected to pole lug forming and pole piece cutting; pole piece bags are manufactured, namely, a single-sheet-shaped first pole piece or a single-sheet-shaped second pole piece is bonded to the front side wall and the back side wall through diaphragms on the two sides in a thermal compounding mode respectively, diaphragms on the front side and the back side extend to the outer side of the first pole piece or the outer side of the second pole piece and then are bonded to form a continuous pole piece bag, and the continuous pole piece bag is cut into single pole piece bags; and a battery cell is formed, namely, the single pole pieces and the single pole piece bags are mutually staggered and overlapped to form 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 diaphragms larger than the pole pieces, the lamination efficiency is effectively improved, combustion caused by short circuit is reduced, and the safety coefficient of the battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a thermal compound manufacturing process for electric cores 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 lamination are used for lamination. Among the...

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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