A battery defect screening device comprising: a battery fixer for fixing a secondary battery ; a discharger for discharging the secondary battery ; a charger for charging the secondary battery ; a voltmeter for measuring an initial voltage value after charging the secondary battery, for measuring a first voltage value after a first time period, and for measuring a second voltage value after a second time period; and a defect screener for: determining the secondary battery to be a normal battery that is without a foreign material when a first voltage change value, which is obtained by subtracting the first voltage value from the initial voltage value, is less than a first reference value; determining the secondary battery to be a defective battery having a hard short due to the foreign material when the first voltage change value is greater than the first reference value; determining the secondary battery to be a normal battery that is without a foreign material when a second voltage change value, which is obtained by subtracting the second voltage value from the initial voltage value, is less than a second reference value; and determining the secondary battery to be a defective battery having a soft short due to the foreign material when the second voltage change value is greater than the second reference value. a battery fixer for fixing a secondary battery ; a discharger for discharging the secondary battery ; a charger for charging the secondary battery ; a voltmeter for measuring an initial voltage value after charging the secondary battery, for measuring a first voltage value after a first time period, and for measuring a second voltage value after a second time period; and a defect screener for: determining the secondary battery to be a normal battery that is without a foreign material when a first voltage change value, which is obtained by subtracting the first voltage value from the initial voltage value, is less than a first reference value; determining the secondary battery to be a defective battery having a hard short due to the foreign material when the first voltage change value is greater than the first reference value; determining the secondary battery to be a normal battery that is without a foreign material when a second voltage change value, which is obtained by subtracting the second voltage value from the initial voltage value, is less than a second reference value; and determining the secondary battery to be a defective battery having a soft short due to the foreign material when the second voltage change value is greater than the second reference value. determining the secondary battery to be a normal battery that is without a foreign material when a first voltage change value, which is obtained by subtracting the first voltage value from the initial voltage value, is less than a first reference value; determining the secondary battery to be a defective battery having a hard short due to the foreign material when the first voltage change value is greater than the first reference value; determining the secondary battery to be a normal battery that is without a foreign material when a second voltage change value, which is obtained by subtracting the second voltage value from the initial voltage value, is less than a second reference value; and determining the secondary battery to be a defective battery having a soft short due to the foreign material when the second voltage change value is greater than the second reference value. <EOS>