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).
The specifications and testing of battery components and performance, including cell cases, vents, capacity, and discharge rates.
Identifier | ExFiles\Box 38\5\ Scan269 | |
Date | 14th November 1922 | |
Contd. -2- EFC1/T14.11.22. (7) For the cell cases the P & R patent material known as Dagenite is used, which we are satisfied cannot possibly crack or leak under any conditions of service. It is a fact that we have verified that the cell cases can be dropped on quite a hard floor without being cracked. The material of these cell cases has a bituminous base. (8) The cells will be fitted with P & R porcelain vent which has anti-splash chamber and coned vent hole to break up bubbles. The vent is in addition fitted with feet which rest on the top of the separators between the plates and hold these down, also minimising the amount of spraying with which the vent has to deal. (9) The lighting capacity of these batteries is a little over 70 ampere hours and the weight complete with case and acid is 95 lbs. The battery requires no additional box but is secured to the running board by long bolts running through to the ends of the battery case. Although the capacity is a little larger than that of the Exide the total weight is no greater. (10) On the high rate discharge test through a constant external resistance of .10 ohm, the battery has shown that it is capable of maintaining a current in excess of 100 amperes for a period of over 10 minutes, the initial current being in the neighbourhood of 108 amperes. This result is decidedly better than that of our standard Exide with modifications, which on the average is only capable of maintaining a current in excess of 100 amperes for about 6 minutes, the initial current being only about 106 amperes. The principal modification which has been necessary to prevent short circuiting by buckling is the insertion of the perforated ebonite separators, resulting in an increased internal resistance, and our specification of maintaining a current in excess of 100 amperes for over 8 minutes is now not complied with, though previously it was. Peto & Radford samples illustrating the above mentioned points will be brought by Hs.{Lord Ernest Hives - Chair} to show to R.{Sir Henry Royce} on his next visit. EFC. | ||