A pole piece and pole piece bag laminated battery cell

Abstract

The invention discloses an electric core with a pole piece and a pole piece bag, which includes a pole piece bag and a second pole piece. The pole piece bag includes a first pole piece and a diaphragm, and the diaphragm includes two pieces. The upper and lower surfaces of a pole piece are bonded to the surface of the first pole piece by thermal compounding; the diaphragm extends horizontally to the outer edge of the first pole piece, and the outer edges of the diaphragms on both sides are along the outer contour of the first pole piece The middle part is bent and thermally compounded and bonded together to form a closed pole piece bag that covers the first pole piece; the above pole piece bag and the second pole piece are aligned by the CCD, and then stacked alternately to form a battery cell. The pole piece and the pole piece bag of the present invention are laminated in alignment to form a battery cell, which solves the problem of diaphragm wrinkling, ensures the position accuracy between the positive and negative pole pieces, simplifies the single diaphragm alignment process of the traditional lamination, and improves the stacking efficiency. The efficiency of the sheet is improved, and the diaphragm fully covers the pole piece to block the direct contact between the pole piece and the electrolyte, reducing short-circuit flammability and improving the safety factor of the battery.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a laminated battery cell with pole pieces and pole piece pockets 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 cell is its core component, and the battery cells are generally composed of positive and negative pole pieces interlaced and superimposed on each other. made. The structure of the battery cell includes a plurality of positive and negative pole pieces that are staggered up and down, and the positive and negative pole pieces 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 t...

AI Technical Summary

Problems solved by technology

However, in the manufacturing process of the unit body, the unit body is made by blind stacking, that is, the positive and negative pole pieces are synchronously transported and laminated in a straight line, and there is no alignment between the positive and negative pole pieces arranged up and down. , the accuracy of the positive and negative pole pieces in the unit cannot be guaranteed. At the same time, the current status quo is that if an alignment process is added to the positive and negative pole pieces arranged above and below each piece, it will take the same time as the existing single-chip stacking process, and it also requires It consumes a lot of time and cannot guarantee the lamination efficiency

In addition, the side parts of the positive and negative pole pieces of the battery cells after the lamination of all the above manufacturing processes are open structures, because the electrolyte is filled around the outside of the stacked battery cores, the positive pole pieces of this open structure The outer edges of the negative electrode and the negative electrode are in contact with the electrolyte around the outside, and there is a safety hazard of short circuit and flammability during actual use.

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