| 摘要 |
PURPOSE:To efficiently continue reaction even at the time of complete discharge by installing a halogen supply tank in a positive electrode side electrolyte storage tank, and installing a diffusion membrane in the halogen supply tank to permeate only halogen vapor and to keep halogen concentration in an electrolyte in a specified value. CONSTITUTION:When a battery is charged, zinc 200 is deposited on a negative electrode 12a in a negative chamber 16, and a bromine complex is formed in a positive chamber 18 and stored in a bromine complex storage tank 28. When the battery is discharged, zinc 200 is ionized to Zn<2+> on the negative electrode side and bromine of the bromine complex 100 is converted into 2Br<->. Bromine is replenished from a halogen supply tank 36 before bromine concentration is decreased to keep bromine concentration in an electrolyte in a range of 0.05-0.1mol. Even in complete discharge, discharge reaction is surely continued. Zinc is smoothly dissolved on the negative electrode side and generation of dendrite is prevented. A diffusion membrane 38 such as 'Teflon(R)' film permeates only halogen without permeation of the electrolyte. |
