Patent ID: 7388383
Filing Date: 2008-06-17
Classification: G01R,H01M,Y02E

Abstract:
1. A computer-executable program for detecting internal resistance of an inspective rechargeable battery, said program being stored on a computer-readable medium and having incorporated therein a detecting method for detecting internal resistance of an inspective rechargeable battery when said inspective rechargeable battery is charged by a constant current-constant voltage charging regime comprising a constant current charging mode and a constant voltage charging mode in that charging is commenced by said constant current charging mode at a constant current value I 0 and after the battery voltage of said inspective rechargeable battery reaches a given voltage value V max , the charging is performed by said constant voltage charging mode at a constant voltage V max until the termination thereof, said detecting method comprising the steps of: (a) obtaining an accumulated, charged electricity quantity of said inspective rechargeable battery in said constant voltage charging mode; and (b) comparing said charged electricity quantity obtained in said step (a) to previously acquired data of a normal rechargeable battery in said constant voltage charging mode, said normal rechargeable battery corresponding to said inspective rechargeable battery, wherein said previously acquired data are with respect to relationships between charged electricity quantities Q wherein when said inspective rechargeable battery has an electricity storable capacity which is reduced to a magnitude of D time that of said normal rechargeable battery, where D is a constant of 0<D≦1, said detecting method further includes a step of correcting said charged electricity quantity obtained in said step (a) by multiplying said charged electricity quantity by 1/D time, wherein the corrected electrical quantity is compared to said previously acquired data of said normal rechargeable battery described in said step (b), and wherein in a case where it is presumed that said electricity storable capacity of said inspective rechargeable battery is reduced to a magnitude of D time that of said normal rechargeable battery, when a duration from a shift time when said constant current charging mode at said constant current value I