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).
Analysis of battery performance under continuous and intermittent high-rate discharge conditions.
| Identifier | WestWitteringFiles\D\May1920\ Scan49 | |
| Date | 18th May 1920 | |
| Contd. -4- EFC1/T18.5.20. It is a peculiarity of these curves for both the continuous and intermittent high rate discharges that there is, in the early stages, a tendency for the current to rise, and in later stages, a tendency for the curves to go in waves especially towards the end where the curves begin to droop. This will have been noticed in the curves on sheet A previously issued. The explanation would appear to be somewhat on these lines, that owing to the rapid fall of rate of discharge, the battery as it were picks up again and attempts to carry on without falling so rapidly. It is further a peculiarity of the intermittent high rate discharge curves that batteries which are good on these high rate discharges, e.g. Tudors, Chlorides and Willard, show as would be expected a better performance with the 45 seconds interval of rest than with the 15 seconds interval, but that batteries which are worse in this respect show a worse performance with the 45 seconds interval than with the 15. It should be stated that in every case, the 15 seconds interval test was taken first. We have not so far investigated this matter by going back again from a 45 seconds interval to a 15 secs. interval, but this would appear to be an interesting point to thrash out sometime. In any case the difference due to the intervals of rest in the good batteries is not as much as might at first be anticipated. Contd... R.R. 235A (100 T) (S.G. 648. 19-2-20) G 2819 | ||