Wavenet Technology Pty Ltd. BM2900D 用户手册
Installation_________________________________________________ Boomer II User Manual & Integrator’s Guide
Copyright Wavenet Technology © November 2003
52
BM210012WT37
NiMH
Mature technology with potential for improvements in battery
chemistry and energy density over the next five years
chemistry and energy density over the next five years
Higher energy density than NiCad, but lower than Li-ion
Available in standard sizes AA, 2/3A, 4/5A, A and 4/3A and
some prismatic (rectangular) configurations
some prismatic (rectangular) configurations
Exhibits the memory effect in a manner similar to NiCad
technology, but at a less pronounced level
technology, but at a less pronounced level
Internal impedance of 35-49
µΩ per 1.2V cell
Typical cell voltages are 1.2V, with multiple cells used to
obtain higher operating voltages
obtain higher operating voltages
Earlier NiMH battery chemistry could be damaged by high
current discharge pulses. Newer battery chemistry has
eliminated this problem. When purchasing batteries of this type,
determine if high current pulse discharging is an issue.
current discharge pulses. Newer battery chemistry has
eliminated this problem. When purchasing batteries of this type,
determine if high current pulse discharging is an issue.
Typical charge method is dT/dt, where T is temperature. As the
battery reaches full charge, any further energy is dissipated as
heat. A temperature threshold is used to terminate the charge
cycle in conjunction with voltage monitoring. NiMH is more
sensitive to overcharging then NiCad and exhibits decreased
capacity if repetitively overcharged.
battery reaches full charge, any further energy is dissipated as
heat. A temperature threshold is used to terminate the charge
cycle in conjunction with voltage monitoring. NiMH is more
sensitive to overcharging then NiCad and exhibits decreased
capacity if repetitively overcharged.
Raw battery cells or battery packs can be purchased from
suppliers.
suppliers.
Li-ion
Reasonably mature technology leaving lots of potential for
increased capacity
increased capacity
Higher energy density than either NiCad or NiMH
Availability is an issue, as most suppliers do not sell cells, but
force customers into particular solutions through their battery
pack designs. Purchasing cells in an effort to design your own
battery pack may be problematic due to cell lead times.
force customers into particular solutions through their battery
pack designs. Purchasing cells in an effort to design your own
battery pack may be problematic due to cell lead times.
Li-ion does not exhibit the memory effect and is unaffected by
partial discharging-charging cycles
partial discharging-charging cycles
Internal impedance of 100-150m
µΩ per 3.6V cell. Li-ion
batteries are very susceptible to damage due to over discharge
and high current pulses. As a result, manufacturers recommend
that a protection circuit be added to battery pack designs. The
resultant internal impedance of a battery pack with protection
circuitry can reach the 500m
and high current pulses. As a result, manufacturers recommend
that a protection circuit be added to battery pack designs. The
resultant internal impedance of a battery pack with protection
circuitry can reach the 500m
Ω level.
Typical cell voltages are 3.6V with multiple cells used to obtain
higher operating voltages.
higher operating voltages.