Abstract
The Advanced Lead Acid Battery Consortium has been researching into VRLA batteries since 1992, initially for electric vehicle (EV) applications, where it achieved significant life extension in deep cycle duty. More recently it has focussed its work on hybrid electric vehicle (HEV) applications where the battery has to operate in High-Rate Partial State-of-Charge (HRPSoC) conditions. Whereas in EV operation failure occurs in the positive plate, in HEV duty, failure is due to negative plate sulfation, resulting in rapid loss of capacity. Ways of overcoming this have been investigated successfully and the ALABC is undertaking vehicle demonstration programmes to publicise this work.
Highlights
In a hybrid electric vehicle, the battery has to be maintained in a partial state-of-charge (PSoC) so that it can both accept regenerative charging and deliver power to assist in propulsion of the vehicle without the battery becoming overcharged or over-discharged
ALABC research activity has concentrated on ways of avoiding this degradation of the negative plate
To raise awareness of the significantly more cost-efficient energy storage option provided by advanced lead-acid batteries. The success of these tests in Honda Insights is described in this paper together with details of the conversion of a current Honda Civic to operate with an Effpower bipolar lead-acid battery
Summary
In a hybrid electric vehicle, the battery has to be maintained in a partial state-of-charge (PSoC) so that it can both accept regenerative charging and deliver power to assist in propulsion of the vehicle without the battery becoming overcharged or over-discharged. In this type of application, the failure mode of the lead-acid battery occurs in the negative plate and is due to a progressive build up of lead sulfate in the negative active material. The success of these tests in Honda Insights is described in this paper together with details of the conversion of a current Honda Civic to operate with an Effpower bipolar lead-acid battery
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