|
Lithium Polymer (LiFePO4)
One of the most advanced electric
vehicle (EV) battery technologies now available
is the solid-state lithium-polymer battery. Lithium-polymer
batteries demonstrate excellent power and range (up
to 45km per charge for our 2008 Li-Pol variants) with relatively affordable
cost, thanks to the comparable ease of solid-state
production and complete absence of liquid electrolyte.
From mid 2008 our all new range of electrically assisted bicycles will come with the option of using this cutting edge Li-Pol technology. This currently only applied to our UM36, but now extends the useable range of all our bikes to between 40km - 45km per charge on full power and sheds more than 2kg in weight off the complete bike, whilst extending battery life by up to 50%.
Features and benefits of Li-Pol (LiFePO4) technology
-
High energy density
- Higher capacity/lower weight (delivering up to twice the capacity for almost half the weight of comparable NiMh Cells and power packs)
-
Flat discharge profile
-
Superior motor performance
-
High nominal Voltage (3.6V versus 1.2V for a typical NiMh cell)
- Smaller package for same Ah rating
-
Low self-discharge rate
-
Longer working time
- Longer storage time between charging
-
Long cycle life (up to 1000 full recharge cycles)
- High return on investment
-
High standard of safety (capable of sustaining up to 10V overcharge)
- Suitable for a large variety of safety critical applications
-
No memory effect
- Can be recharged at any time during the operational cycle
-
No Leakage and no heavy metal
-
Flexible form factor
- Any reasonable shape or size can be produced (prismatic)
- Very safe with no explosion danger
- Suitable for a wide variety of safety critical applications
|
|
|
| |
Urban Mover™ - Battery Comparison Chart |
| |
|
|
|
|
|
|
|
| |
Lead Acid
|
Silicon |
Ni-Cad |
NiMh |
Li-ion |
Li-Pol |
Li-Phos |
| Safety |
Good |
Very good |
Good |
Good |
Good |
very good |
Excellent |
| Nominal voltage |
2 |
2 |
1.2 |
1.2 |
3.4 |
3.7 |
3.7 |
| Wh/Kg Energy density (gravimetric) |
35 |
50 |
41 |
80 |
120 |
160 -180 |
120 |
| Volumetric energy density |
80 |
130 |
120 |
200 |
280 |
>320 |
270 |
| Cycle life |
200 |
400 |
250 |
400-500 |
400-500 |
>1000 |
>2000 |
| Memory effect |
No |
No |
Yes |
No |
No |
No |
No |
| Operational temperature (C) |
-15° to +50° |
-50° to +70° |
-20° to +50° |
-20° to +60° |
-20° to +60° |
-20° to +60° |
-45° to +70° |
| Flexible form factor |
No |
No |
Yes |
No |
No |
Yes |
Yes |
| Self discharge (% per month) |
<0 |
<0 |
<10 |
<20 |
<5 |
<5 |
<5 |
| Environmental impact |
High |
Low |
High |
Medium |
Medium |
Low |
Very Low |
| Initial purchase cost |
Low |
Medium |
Medium |
Medium |
Medium |
High |
Medium/high |
| Lifetime cost (based on range and cycle life) |
High |
Medium |
Medium |
Low |
Low |
Low |
Very Low |
| |
|
|
