Basic chemistry of gas recombination in lead-acid batteries
Download Citation | Basic chemistry of gas recombination in lead-acid batteries | Oxygen-recombination chemistry has been wedded to traditional lead-acid battery technology
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How do battery technologists deal with gas recombination chemistry?
Instead, the focus is on the gas recombination chemistry and some of the ways battery technologists must deal with it in developing functional VRLA products. Sealed nickel-cadmium cell technology has been developed to optimize the efficiency of the oxygen-recombination process.
Is there a standard for gas recombination batteries?
Note, as yet there is no European or IEC Standard. 40 Benefits of gas-recombination technology One of the major benefits of gas-recombination batteries is their high energy density, especially at high rates of discharge, when compared with conventional lead/acid products.
What is a recombination battery?
A recombination battery is a type of battery where the process of charging reverses the chemical reaction that occurs during discharge, allowing the oxygen and hydrogen gases produced to react and form water, reducing the need for maintenance. Recombination batteries were first used in aircraft applications in the late 1970s in the U.S.A., where individual cylindrical cells (with a C/1 capacity of 18 A h) were assembled in a rectangular outer case to give a 24 V battery.
Why are there no recombination systems in lead-acid batteries?
Early attempts to incorporate recombination into lead-acid batteries were unsuccessful because of excessive cost, size, and/or complexity, and none were effectively commercialized. Over the past 20 years, recombination systems have been developed and are undergoing an extensive program of definition and refinement at many battery companies.
Are recombination batteries maintenance free?
Although recombination batteries are labeled as maintenance free, a free-electrolyte car battery with antimony-free grids and a sufficient reserve of acid can operate for extremely long periods without the need for topping-up. However, in practice, recombination batteries have little or no advantage in this respect.
How to design and test a recombination cell or battery?
When designing and testing a lead-acid recombination cell or battery,nSpecial attention must be paidnto various additional aspects. For example,nin maintenance-free applications,ntests must be devised that simulate service conditions to show that water loss is very low.