From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Report discussing the effects of overcharging and discharging on battery plates and detailing a vibration test on a modified cell.
| Identifier | ExFiles\Box 49\5\ Scan313 | |
| Date | 12th August 1931 | |
| Contd. -2- EFC {E. Fowler Clarke - Electrical Engineer} 1/T12.8.31. having flaked off the surfaces of the plates. This rather bears out, as we have heard, that continuous overcharging alone does not deteriorate the plates very much, but what is so bad for a battery is a lot of overcharging with intervening periods of discharge. The reason of this is that protective films form on the plates during charge preventing subsequent internal action. During discharge these films are removed and each successive charge penetrates further into the active material and the grids. We are now taking a cell from the standard battery which has undergone the vibration test, i.e. a cell with the latest modifications, and putting this through the process of considerable overcharging with intervening discharges. The elements of this cell as they come from the vibration, are in good condition, and it will be interesting to see if the electrical overcharging and discharging treatment of this cell stationary will bring about as much deterioration as on the previous cell. EFC. {E. Fowler Clarke - Electrical Engineer} | ||