US 12,438,204 B2
Power storage system and controller for power storage system
Kimihiko Furukawa, Kakogawa (JP); and Yasuyuki Harada, Kakogawa (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Dec. 23, 2021, as Appl. No. 17/561,582.
Claims priority of application No. 2020-216507 (JP), filed on Dec. 25, 2020.
Prior Publication US 2022/0209319 A1, Jun. 30, 2022
Int. Cl. H01M 10/44 (2006.01); H01M 10/42 (2006.01)
CPC H01M 10/441 (2013.01) [H01M 10/425 (2013.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A power storage system including a plurality of storage battery modules connected in parallel with a load, the power storage system comprising:
a processor configured to
calculate a resistance value of each storage battery module of the plurality of storage battery modules;
calculate a permissible current value of each storage battery module of the plurality of storage battery modules;
based on a ratio of the resistance value of each storage battery module of the plurality of storage battery modules, calculate a plurality of calculation results respectively indicating, for the permissible current value of each storage battery module of the plurality of storage battery modules, a value of a current divided into each storage battery module of the plurality of storage battery modules, and
determine, as a maximum value of a current to be passed through the load, a calculation result, among the plurality of calculation results, having a largest total current value without exceeding the permissible current value of each storage battery module of the plurality of storage battery modules, wherein
the processor is configured to
calculate the resistance value of each storage battery module every time a predetermined period elapses, and
in response to a significant change of a current value of the current, calculate the resistance value of each storage battery module using a voltage and an instantaneous value of the current at a time of the significant change.