US 12,424,671 B2
Battery management system integrated circuit
Alain Salles, Pechbusque (FR); Patrice Besse, Tournefeuille (FR); Olivier Tico, St Lys (FR); and Thierry Dominique Yves Cassagnes, Tournefeuille (FR)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, INC., Austin, TX (US)
Filed on Mar. 21, 2023, as Appl. No. 18/187,002.
Claims priority of application No. 22305365 (EP), filed on Mar. 25, 2022.
Prior Publication US 2023/0307724 A1, Sep. 28, 2023
Int. Cl. H01M 10/42 (2006.01); H01M 10/48 (2006.01); H02H 7/18 (2006.01); H02J 7/00 (2006.01)
CPC H01M 10/425 (2013.01) [H01M 10/482 (2013.01); H02H 7/18 (2013.01); H02J 7/0019 (2013.01); H02J 7/0029 (2013.01); H01M 2010/4271 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A battery management system, BMS, integrated circuit, IC, for a battery pack, wherein the battery pack comprises:
a sequence of battery cells connected in series; and
a sequence of battery-cell-connection-nodes between adjacent battery cells, wherein the BMS IC comprises:
a sequence of cell-measuring-pins for connecting to corresponding battery-cell-connection-nodes;
a plurality of bi-directional ESD protection elements, each one connected between a pair of adjacent cell-measuring-pins in the sequence;
a sequence of cell-balancing-pins for connecting to corresponding battery-cell-connection-nodes;
a plurality of dual polarity switches, each one connected between a pair of adjacent cell-balancing-pins in the sequence;
a plurality of cell-balancing-first-diodes, one for each of the cell-balancing-pins;
a plurality of cell-balancing-second-diodes, one for each of the cell-balancing-pins;
a ground terminal;
a second voltage node; and
a cell-balancing-clamp connected in series between the ground terminal and the second voltage node;
wherein:
each cell-balancing-pin is connected to the anode of an associated cell-balancing-first-diode;
each cell-balancing-pin is connected to the cathode of an associated cell-balancing-second-diode;
the cathode of each cell-balancing-first-diode is connected to the second voltage node; and
the anode of each cell-balancing-second-diode is connected to the ground terminal.