Page 445 - Battery Reference Book

43/4 Electric vehicle secondary batteries

Figure 43.2 Silent Rider Bus (Chloride Motive Power Group). Vehicles with predictable route patterns are particularly suitable for battery
power (Courtesy of Chloride Batteries)

I
Rest milesh Battery charge m40 miles),, Battery charge
4. 7-

3 0 5 1000 1500 1830 2400
Time
Figure 43.3 The potential for a battery-operated bus with a range of 40 miles. Nearly 50% of buses on city centre journeys during peak
periods cover less than 25 miles, with a further 40% covering no more than 40 miles. The shaded areas of this graph clearly show the
potential for a battery operated bus with a range of 40 miles (Courtesy of Chloride Batteries)

capability for use in advanced electric road vehicles. Improvements of up to 40% in energy density from
The general approach has been to increase plate surface 23 W h/kg-' in 1980 to 40 W h/kgg' in 1990 (5 h rate)
area by using thinner plates. These changes also have have been achieved, but with the adverse effect of
the effect of reducing plate pitch, thereby reducing the reduced cyclic life. More progress has been made with
impedance of the cell and increasing power capability. tubular designs because the retention of positive active