Sealed bipolar Ni-Cd batteries

Specific energies greater than 70 Wh-kg^-1 can only be achieved for a 24 V Ni-Cd battery by reducing the weight of the bipolar collecting support. SORAPEC-NITECH has developed a lightweight foam substrate with which it is now possible to obtain bipolar electrodes with a collector thinner than 0.1 mm. These high volumetric energy density structures are well adapted for sealed battery applications. The performances of these batteries were studied as well as the optimization measures necessary to regulate the gas evolution in the cell during end of charge. The characteristic curves obtained with such cells during these tests are given