STORAGE BATTERY DEVICE WITH THE NUMBER OF SHORT-CIRCUIT CELL DETECTING FUNCTION

摘要

PURPOSE:To detect the number of short-circuit cells accurately by considering the variation of the cell voltage according to the amount of the charging current. CONSTITUTION:When the charging of a cadmium storage battery 1 is started, a very short sampling cycle T2 is set, the time T2 is multiplied to the charging current input to an analog port AD2 through a charging current input circuit 2c, so as to calculate the charging capacity, and it is integrated. By the charging capacity and the integrated battery capacity, the value of the RAM in a microcomputer 2a is renewed, so as to carry out a short-circuit cell number detecting process. That is, it is decided whether the integrated capacity before the inner RAM is renewed is less than a specific value R% of the rating battery capacity stored in an external memory device EEPROM 2e connected to IO ports Do to D3 of the microcomputer 2a, or whether the integrated capacity after the renewal is more than the rating R%. And when the integrated capacity exceeds the rating R% by the charging, the short-circuit cell number is detected only one time. This can be calculated from the terminal voltage input to the analog port AD1, and the estimated cell voltage read from the inner ROM by the charging current value.