Thus, the strong position of lead-acid batteries in this field will be improved by the valve-regulated design, and they will remain in widespread use in the future. Furthermore, the VRLA design opens applications for lead-acid batteries where acid stratification had been an obstacle for the vented design.
The conventional design of valve regulated lead-acid battery (VRLA) has a series of cells, each one containing a number of positive and negative electrodes connected in parallel and physically separated by a porous material which allows the free circulation of ions during the electrochemical charge and discharge reactions.
The high power VRLA batteries are produced by a new continuous process, that will allow, in future, a substantial electrode thickness reduction, from about 1 mm (present value) to around 0.5 mm. Furthermore, it will be necessary to achieve a similar reduction in the conventional glass micro-fibre separator.
It is expected that by overcoming the problems associated with the positive plate performance, high power VRLA batteries would reach the following minimum performances: Specific power >500 W/kg (10 s discharge at 60% state of charge); fast charge <4 min (from 40 to 80% SOC); calendar life: 3–5 years; cycle life >1000 deep cycles (>60% DoD).
The test is based on the DIN standard, which means that both batteries can be classified as “heavy duty” for industrial vehicles, although the deep cycle design exceeded the requirement by more than five times. 4.3. Endurance at high temperature
These achievements will not be made at the expense of a higher cost, which should be maintained under the car manufacturers requirements (<150 $/kW h), and as a consequence, high power VRLA batteries will continue to be the most economical approach as the power source of the new vehicles.
This paper updates work carried out to develop spiral wound valve-regulated lead-acid (VRLA) batteries for vehicles with different hybridisation degrees, ranging from stop …
This paper updates work carried out to develop spiral wound valve-regulated …
The fundamental mechanisms underlying the operation of the valve-regulated version of the lead–acid battery have been thoroughly studied and their influence on life …
Within a 3-year EU funded project, a new AGM valve-regulated lead–acid …
Work presented in this paper deals with the study of different design …
The development of valve-regulated lead–acid (VRLA) batteries containing absorptive glass mat (AGM) separators resulted from a highly focused venture technology program at Gates …
Within a 3-year EU funded project, a new AGM valve-regulated lead–acid battery with weight and volume substantially reduced, as well as a substantial improvement in its …
This work highlights the performance metrics and the fundamental degradation mechanisms of lead-acid battery technology and maps these mechanisms to generic duty cycles for peak shaving and frequency …
Valve-regulated lead-acid batteries are used to supply power during commercial power failures or rectifier malfunctions. Use of valve-regulated lead-acid batteries, however, often leads to …
This paper deals with the development of AGM and gel valve-regulated …
Work presented in this paper deals with the study of different design parameters, manufacturing process and charging conditions of spiral wound valve-regulated …
The low porosity of the active mass, together with the high compression …
The batteries with large capacity, and high input and output power properties are required. We developed long life VRLA batteries for the load leveling by utilizing nighttime energy storage, …
The authors developed valve-regulated lead-acid batteries for power storage with long cycle …
An overview of the design and development of a valve-regulated lead–acid (VRLA) battery with thin tubular plates is presented. Substantially improved specific energy in …
GS Yuasa has developed the "SLR-1000" Super Long Cycle Life Valve Regulated Lead Acid Battery. The newly developed "SLR-1000" has excellent cycle life performance of 5,000 cycles …
The fundamental mechanisms underlying the operation of the valve-regulated …
Previous work on the development of spiral wound valve-regulated lead-acid (VRLA) batteries for future automotive applications was focused on active material …
This paper deals with the development of AGM and gel valve-regulated lead–acid batteries for advanced automotive applications. AGM VRLA battery development …
A Valve Regulated Lead Acid (VRLA) battery is a rechargeable, sealed battery. It uses a limited amount of electrolyte, which can be in absorbed glass mat or ... making them …
The authors developed valve-regulated lead-acid batteries for power storage with long cycle life, designed for accumulating excess power that is cheap during the nighttime and for making …
The low porosity of the active mass, together with the high compression design, gave this impressive result for a high power/thin plate valve-regulated design. The test is …
Experiment results indicate that addition of EAC in negative active materials can prolong the high-rate partial-state-of-charge cycle performance of valve-regulated lead-acid …
Using new lead-composite materials and innovative cell-design and packaging design rules, Electrosource has developed a high-specific-energy, long-cycle-life, valve …
Experiment results indicate that addition of EAC in negative active materials …
Yuasa REC36-12, 12v 36Ah Valve Regulated Lead-Acid (VRLA) High Capacity Deep Cycle Battery is an excellent 36 hole battery for use with Powakaddy®, Motocaddy®, Fraser®, …
Yuasa REC22-12, 12v 22Ah Valve Regulated Lead-Acid (VRLA) High Capacity Deep Cycle Battery is an excellent 18 hole battery for use with Powakaddy, Hillbilly® Motocaddy®, …