A method for manufacturing a wound-type laminated battery electrode assembly

Abstract

The invention relates to a fabrication method for an electrode assembly of a winding type lamination battery. The fabrication method comprises the following steps of applying a polymer adhesive at the peripheries of the surfaces of a positive pole plate and a negative pole plate; sequentially laminating the positive pole plate coated with the polymer adhesive, a ceramic separator and the negative pole plate, and combining the positive pole plate, the ceramic separator and the negative pole plate to form a battery module; sequentially arranging the battery modules on the upper side surface and the lower side surface of a winding separator, allowing the battery modules on the upper side surface and the lower side surfaces of the winding separator to be arranged opposite to each other, and fixing the battery modules on the surface of the winding separator by a hot-pressing mode; winding the winding separator to the other end from one end, and allowing the positive pole plate, the ceramic separator and the negative pole plate to be sequentially laminated to form the lamination battery. According to the method, an adhesive is only dispersed at the peripheries of the pole plates, the range covering the pole plates by an adhesive liquid is small, the pole plates and the separator are tightly combined, a separator hole cannot be blocked, the adhesive liquid is saved, and the fabrication process of the electrode assembly is also reduced; and moreover, the fabrication efficiency is high, the labor is saved, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of manufacturing lithium ion batteries, in particular to a method for manufacturing a wound-type laminated battery electrode assembly. Background technique [0002] As the demand for lithium-ion batteries in the electric vehicle market continues to expand, people's requirements for the energy density of power batteries for electric vehicles continue to increase. At present, the production of power battery electrode components mainly adopts winding type, laminated type and wound stacked type. For the winding type, the manufacturing process is simple and efficient, but the disadvantage is that the separator and the pole piece are not tightly bonded, which makes the pole piece easy to separate lithium, etc.; for the laminated type, although the energy density of the manufactured battery is relatively higher , but the production efficiency is low and the positive and negative plates are easy to move and cause misalignmen...

AI Technical Summary

Problems solved by technology

For the winding type, the manufacturing process is simple and efficient, but the disadvantage is that the separator and the pole piece are not tightly bonded, which makes the pole piece easy to separate lithium, etc.; for the laminated type, although the energy density of the manufactured battery is relatively higher , but the production efficiency is low and the positive and negative plates are easy to move and cause misalignment; for the winding laminated type, there are advantages and disadvantages on the basis of the above two electrode assembly methods, but the existing technology mainly uses glue on the separator. The pole piece and the winding diaphragm are fixed in a fixed way. The whole battery production process needs to increase the diaphragm coating process, and if the process of compounding the glued diaphragm and the pole piece is not handled properly, it will easily lead to the blockage of the diaphragm pores, resulting in the final internal resistance of the battery. large, small, etc.

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