Nickel-cadmium batteries and lithium batteries
2009-9-3 15:02:03 from：www

1, nickel-cadmium batteries (Nickel-Cadmiun Batteries) 'characteristics of
1. Nickel-cadmium batteries can be repeated in more than 500 'charge and dis'charge, very economy;
2. Resistance is small, for large current dis'charge, dis'charge voltage when it changed very little, as the DC power supply is an extremely high quality of the battery;
3. Because the use of fully enclosed, so there is no electrolyte leakage phenomenon, but also completely without added electrolyte;
4. In contrast with other types of batteries, nickel-cadmium batteries can withstand over'charge, or let go of electricity, simple operation;
5. Nor will it place a long time under the performance deterioration, when the 'charge is finished immediately after power returns to its original 'characteristics;
6. Can be used in a wide temperature range;
7. The use of metal containers because it is 'created, there are mechanical strong;
8. Nickel-cadmium battery, under very strict quality control have been manufactured, with very good depends on the quality of nature.
2, nickel-cadmium battery dis'charge 'characteristics
1. Dis'charge voltage according to its dis'charge current is somewhat different, generally around 1.2V;
2. The battery capacity to Ah, mAh expressed in units;
3. When the dis'charge limit of reached the end of dis'charge when the called the dis'charge termination voltage, nickel-cadmium battery dis'charge termination voltage 1.0V/cell;
4. Temperature range -20 ℃ ~ 60 ℃, in this context can be dis'charged.
Third, to conserve Note
1. Available at -30 ℃ ~ 50 ℃, within the temperature range between the saved, but if they are placed in a long case, please keep the following at 35 ℃;
2. State of 'charge or dis'charge state of preservation is possible, but the comparison can dis'charge capacity of the state, and easier to be activated earlier reply;
3. When the batteries in place a long time, use the former to be very in 'charge before use.
4, nickel-cadmium battery memory effect (memory effect)
When the nickel-cadmium batteries to repeat after a few remained at a low dis'charge capacity after 'charging, if you have to do a relatively large number of dis'charge the battery will not work, this situation we call memory effect. Memory effect that nickel-cadmium batteries may be the most easily misunderstood the issue. Dis'charge termination voltage is set higher video recorder, with the use of the voltage change is low, the surface may seem as reduced, but the low dis'charge voltage can be from 1 or 2 times a complete dis'charge to resolve this phenomenon. Proposal to conduct a 10 second 'charge-dis'charge, in order to prevent the proposed effect.
Lithium batteries
1, lithium battery (Lithium Ion Battery) features:
1. Has a high energy density, and high-capacity nickel-cadmium battery power compared to its volume of 1.5 times the weight of the energy density of two times;
2. High-voltage, average voltage is 3.6V, is a nickel-cadmium batteries, nickel-metal hydride battery three times (Ni-Cd, Ni-MH battery voltage of 1.2V);
3. Use voltage flat and high-capacity;
4. Load 'characteristics, 2C dis'charge as possible;
5. A wide range of temperature -20 ℃ ~ 60 ℃
6. Excellent 'charging and dis'charging of life, after 500 times of its capacity after dis'charge at least 70%.
Nickel-metal hydride batteries and lithium batteries differences:
First, the weight of
Each one-cell battery voltage of view, are the nickel-metal hydride and nickel-cadmium 1.2V, while the lithium battery is indeed as 3.6V, lithium battery voltage is 3 times the other two. And the weight of the same type of battery lithium batteries and nickel-cadmium batteries is almost equal, while heavier than Ni-Ni-MH battery. We can see that the battery itself, the weight of each one different, but the high-voltage lithium batteries because of 3.6V, in the case of the output voltage is equal to the number of combinations of a single cell can be reduced after the third Er Shi forming the battery weight and size reduction.
2, the memory effect
Nickel-metal hydride batteries and nickel-cadmium batteries have the same memory effect. Therefore, the regular dis'charge management is necessary. This regular dis'charge management are fuzzy state has been dealt with, or even knowledge of some of the incorrect conduct dis'charge (dis'charge or use a few times each time after the dis'charge were a result of the company's vary) This cumbersome dis'charge management the use of nickel-metal hydride batteries can not be avoided. In terms of relative lithium batteries because no memory effect, very convenient and simple in use. It is completely without regard to the residual voltage is how much can be 'charged directly, 'charging time can be shortened nature.
Third, self-dis'charge rate
Nickel-cadmium batteries to 15 ~ 30% (months). Ni-MH battery for 25 ~ 35% (month), lithium battery 2 ~ 5% (months). Than nickel-metal hydride batteries self-dis'charge rate is the highest, while the lithium battery expertise with the other two types of battery dis'charge rate compared to very low.
4, 'charging
Nickel-metal hydride batteries and lithium batteries can not be resistant to over'charge. Therefore, the nickel-metal hydride batteries for constant current 'charging PICK CUT control mode when the 'charging voltage is the highest, to stop the 'charge as the best way of 'charging. The lithium batteries using constant current, constant voltage 'charging mode the best, if nickel-cadmium battery 'charger-DV controlled manner, then pairs of nickel-metal hydride re'chargeable batteries and lithium batteries.

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