Battery state analysis system, battery state analysis method, and non-transitory computer-readable recording medium

A battery state analysis method comprising:

• acquiring voltage data and current data for each cell of a battery pack in which a plurality of cells are connected in series or for each parallel cell block of battery pack in which parallel cell blocks, each comprised of a plurality of cells connected in parallel, are connected in series;
• estimating an ohmic resistance value of each cell or each parallel cell block, based on the voltage data and the current data for each cell or each parallel cell block;
• statistically processing the ohmic resistance value of each cell or each parallel cell block and calculates a representative value of the ohmic resistance value of a single cell or a single parallel cell block of a particular battery pack or of a plurality of battery packs of the same type;
• and
• generating an external resistance correction value for correcting deviation of an external resistance of each cell or each parallel cell block, based on a difference between the ohmic resistance value of each cell or each parallel cell block and the representative value of the ohmic resistance value.

A non-transitory computer-readable recording medium having embodied thereon a battery state analysis program comprising:

• a module that acquires voltage data and current data for each cell of a battery pack in which a plurality of cells are connected in series or for each parallel cell block of battery pack in which parallel cell blocks, each comprised of a plurality of cells connected in parallel, are connected in series;
• a module that estimates an ohmic resistance value of each cell or each parallel cell block, based on the voltage data and the current data for each cell or each parallel cell block;
• a module that statistically processes the ohmic resistance value of each cell or each parallel cell block and calculates a representative value of the ohmic resistance value of a single cell or a single parallel cell block of a particular battery pack or of a plurality of battery packs of the same type;
• and
• a module that generates an external resistance correction value for correcting deviation of an external resistance of each cell or each parallel cell block, based on a difference between the ohmic resistance value of each cell or each parallel cell block and the representative value of the ohmic resistance value.