METHOD AND DEVICE FOR RECONDITIONING NICKEL- CADMIUM STORAGE CELLS Russian patent published in 2002 - IPC

FIELD: electrical engineering; chemical-to-electrical energy converting devices. SUBSTANCE: method for reconditioning cells incorporated in storage battery involves predischarge of battery to 0.05 V followed by its charging to specified maximum; prior to discharging and charging the battery the latter is charged, its voltage is measured and compared with desired value; if battery has no shorted- out parts it is given one charge/discharge cycle by ac current of rated value at frequency of 20 kHz to 80 Hz whose time dependence is of sawtooth character which is, essentially, a dependence asymmetric relative to 0 V with charge-to-discharge portion ratio in charging being (20-4) : 1 and 1 : (20-4) in discharging, rise-time pulse amplitude exceeding mean value of charging current by 4-5 times; in case shorted-out components are found in battery, the latter should be given prior to its discharging and charging a multiple impact with aid of minimum 10 000 mcF capacitor charged to 25-60 V followed by charging the battery cells to rated value whereupon charge/discharge cycle of battery is made as described above repeating additional charge by equalizing current. Device implementing proposed method has power unit and charge/discharge unit connected to battery; charge/discharge unit is provided with master oscillator, current generator designed for battery charging and discharging, and also control and display unit; master oscillator is connected via control circuits to control and display unit and its output is connected to input of current generator whose output is connected to storage battery, the latter being also connected to control and display unit; newly introduced capacitor unit is provided with switch which functions to turn off voltage of 25-60 V from this capacitor unit and to connect it to storage battery. EFFECT: facilitated procedure, enhanced operating reliability. 2 cl, 4 dwg