초록 ▼

A rechargeable battery pack has a battery voltage detector, a full charge detecting circuit detecting a full charge state, a switch interposed in a charge current circuit that opens the charge current circuit when detecting a fall charge state, a memory for storing a closed circuit voltage immediate

A rechargeable battery pack has a battery voltage detector, a full charge detecting circuit detecting a full charge state, a switch interposed in a charge current circuit that opens the charge current circuit when detecting a fall charge state, a memory for storing a closed circuit voltage immediately before the charge current circuit is opened, an internal resistance detection circuit for finding a value corresponding to an internal resistance of the rechargeable battery cell from an open circuit voltage and the closed circuit voltage stored in the memory after the charge current circuit is opened, and a lifetime indicator to predict lifetime. This enables accurate determination of the lifetime of the rechargeable battery cell under stable conditions without wastefully consuming the charging capacity.

대표청구항 ▼

1. A rechargeable battery pack comprising:at least one rechargeable battery cell, a battery voltage detecting means for detecting a terminal voltage of said rechargeable battery cell, a fall charge detecting means for detecting a full charge state of said rechargeable battery cell when a predetermin

1. A rechargeable battery pack comprising:at least one rechargeable battery cell, a battery voltage detecting means for detecting a terminal voltage of said rechargeable battery cell, a fall charge detecting means for detecting a full charge state of said rechargeable battery cell when a predetermined parameter reaches a value indicating achievement of the fall charge state of said rechargeable battery cell while said rechargeable battery cell is charged, a switch device interposed in a charge current circuit of said rechargeable battery cell and turned off to open said charge current circuit when said full charge detecting means detects a full charge state, a memory for storing a closed circuit voltage Von of said rechargeable battery cell detected by said battery voltage detecting means immediately before said charge current circuit is opened, an internal resistance detecting means for finding a value corresponding to an internal resistance Rin of said rechargeable battery cell from an open circuit voltage Voff of said rechargeable battery cell detected by said battery voltage detecting means and the closed circuit voltage Von stored in said memory after said charge current circuit is opened, and a lifetime indicating means for predicting the lifetime of said rechargeable battery cell in accordance with the value corresponding to the internal resistance of said rechargeable battery cell and outputting information on the lifetime.