Electrode assembly and related battery, battery module

A manufacturing method of an electrode assembly, comprising:

• providing a plurality of first type of electrode plates, at least one second type of electrode plate and a diaphragm, wherein the polarity of the plurality of first type of electrode plates is opposite to the polarity of the at least one second type of electrode plate, the diaphragm is configured to separate adjacent first type of electrode plate from the second type of electrode plate, the plurality of first type of electrode plates comprises a first electrode plate and a second electrode plate, the first electrode plate comprises a first current collector, the second electrode plate comprises a second current collector, wherein the first current collector comprises a first conducting layer and a protective layer which are arranged in an overlapping manner along a direction vertical to a surface on which the first type of electrode plate and the second type of electrode plate are overlapped, and the resistivity of the protective layer is greater than the resistivity of the first conducting layer, the first current collector comprises two of the protective layers, respectively arranged at two sides of the first conducting layer;
• the second current collector is composed of a second conducting layer;
• and
• arranging the plurality of first type of electrode plates, at least one second type of electrode plate and the diaphragm in an overlapping manner.