The invention discloses a production method of a
lithium ion power battery with consistency improved. According to the invention,
anode sheets and
cathode sheets are obtained through
coating and
cutting technologies, and are graded according to the weight of each sheet; a total weight of
anode sheets in a single battery is controlled through steps that: a group of
anode sheets with a total anode sheet number required by the single battery is weighed, wherein the anode sheets can be selected from a middle weight grade, or can be randomly selected from at least two weight grades; according to ameasured weight, anode sheets in the grade of a larger weight are replaced by anode sheets in the grade of a smaller weight, or anode sheets in the grade of a smaller weight are replaced by anode sheets in the grade of a larger weight; finally, the total weight of the anode sheets is controlled within a required total
weight range. With the production technology modification provided by the invention, consistency of the
lithium ion power battery is greatly improved, service life of the
lithium ion power battery is prolonged, and application safety of the lithium ion power battery is ensured.