A switching circuit for balancing battery cells, comprising switching sets connected between a balance electric source (Bv+, Bv-) and the battery cells (B1, B2, B3, B4, B5, B6, B7, B8), - the balance electric source (Bv+, Bv-) applying a balance current to the battery cells (B1, B2, B3, B4, B5, B6, B7, B8) through the switching sets, characterized in that the switching sets being arranged in an hierarchical structure so that: - each of said switching sets including a plurality of pairs of switching means (S11-S12; S13-S14; S15-S16; S17-S18; S31-S33; S32-S34), - one of the switching sets comprising at least eight switching means; - the switching means of each switching set being connected in pairs such that each switching mean of a switching set is directly connected through one of its terminals electrically closer to the source to the terminal electrically closer to the source of only one other switching mean of the same switching set; - each switching mean of a switching set electrically closer to the source being directly connected to only one pair of switching means of the adjacent switching set electrically closer to the battery cells by its terminal electrically closer to the battery cells, - in each pair of the switching means of the switching set electrically closest to the battery cells (S11-S12; S13-S14; S15-S16; S17-S18;) one of the switching mean (S11, S13, S15, S17) being directly connected to the negative terminal of the battery while the other switching mean (S12, S14, S16, S18) being directly connected to the positive terminal of the battery both through their terminals electrically closer to the battery cells; wherein the number of pairs of switching means increases in each switching set going from the balance electric source (Bv+, Bv-) to the battery cells (B1, B2, B3, B4, B5, B6, B7, B8); thereby reducing the internal voltage applied to the switching means. - the balance electric source (Bv+, Bv-) applying a balance current to the battery cells (B1, B2, B3, B4, B5, B6, B7, B8) through the switching sets, - each of said switching sets including a plurality of pairs of switching means (S11-S12; S13-S14; S15-S16; S17-S18; S31-S33; S32-S34), - one of the switching sets comprising at least eight switching means; - the switching means of each switching set being connected in pairs such that each switching mean of a switching set is directly connected through one of its terminals electrically closer to the source to the terminal electrically closer to the source of only one other switching mean of the same switching set; - each switching mean of a switching set electrically closer to the source being directly connected to only one pair of switching means of the adjacent switching set electrically closer to the battery cells by its terminal electrically closer to the battery cells, - in each pair of the switching means of the switching set electrically closest to the battery cells (S11-S12; S13-S14; S15-S16; S17-S18;) one of the switching mean (S11, S13, S15, S17) being directly connected to the negative terminal of the battery while the other switching mean (S12, S14, S16, S18) being directly connected to the positive terminal of the battery both through their terminals electrically closer to the battery cells;