Charging taper

Fig. A 1.2 (a) Pulse charge and OCV sensing of a RENEWAL rechargeable alkaline manganese cell, (b) Typical current and voltage profiles during charging of an AA sized RENEWAL rechargeable alkaline manganese cell using the pulse taper charge method. (By permission of Rayovac.)...

Performing long term taper charge experiments revealed that RAM cells have been maintained at 1.65 V for up to one month without bulging or leakage. 

Furthermore, the end of a taper charge is controlled by a fixed voltage instead of a fixed current. A new lead-acid battery has a high counter emf, which will result in a low final charge rate and cause the battery to be... 

FIGURE 22.9 Charging characteristics of a typical cylindrical 18650 lithium ion battery at 20°C. Battery is charged at constant current of 1.8 Amps (nominal C-rate) to 4.2 Volts followed by a taper charge at this voltage for a total time of 2 hours. 

FIGURE 23,50 Typical charger and battery characteristics for taper charging of lead-acid batteries, (a) Single-step taper charge, (b) Two-step taper charge. (From Ref. 10.)... 

FIGURE 35.53 Capacity of a 25 Ah cylindrical Li-ion battery when cycled at the C/5 rate between 4.1 V with taper charge to C/50 and 3.0 V for 500 cycles at 23°C. (Courtesy of Blue Star Advanced Technologies. Reproduced with per-mission from SAE paper 01-1390, 1999.)... 

FIGURE 35.56 Performance of a 1.4 Ah wound prismatic CGP345010 C/LiCoOj battery at various discharge rates to 3.0 V at 20°C, after being charged at 945 to 4.2 V followed by a taper charge for 2 hours total at 20°C. 

Taper charging with constant potential, the simplest method of charging, is satisfactory for charging batteries in cyclic service. This method requires control of overcharging and of battery heating, both of which adversely affect battery life. In general, battery life is shorter than is obtained in the other charging methods discussed. 

Taper charging of lead-acid motive power batteries... 

---