Basic knowledge of rechargeable batteries
A nickel-cadmium batteries (Ni-Cd)
Voltage: 1.2V life: 500 times
Discharge Temperature: -20 ° ~ 60 ° C Charging Temperature: 0 ° ~ 45 °
Note: anti-overload capacity.
B, nickel-metal hydride battery (Ni-Mh)
Voltage: 1.2V life: 1000 times
Discharge Temperature: -10 ° ~ 45 ° C Charging Temperature: 10 ° ~ 45 °
Note: Currently, the maximum capacity of about 2100mAh.
C, lithium-ion battery (Li-lon)
Voltage: 3.6V life: 500 times
Discharge Temperature: -20 ° ~ 60 ° C Charging Temperature: 0 ° ~ 45 °
Note: Ni-MH battery Light weight ratio 30% ~ 40% higher than Ni-MH battery capacity over 60%. But the extra forward, if the extra cost will the temperature is too high and damage the structure = “exploded.
D, lithium-polymer battery (Li-polymer)
Voltage: 3.7V life: 500 times
Discharge Temperature: -20 ° ~ 60 ° C Charging Temperature: 0 ° ~ 45 °
Note: electricity lithium improved, there is no battery fluid, while the transition to a polymer electrolyte can be molded into shape, and stability than lithium batteries.
E, lead acid batteries (Sealed)
Voltage: 2V life: 200 ~ 300 times
Discharge Temperature: 0 ° ~ 45 ° C Charging Temperature: 0 ° ~ 45 °
Note: this is the car battery in general (which is based on six 2V Series in the 12V), free water in the battery life up to 10 years, but the volume and the volume is larger.
Purchasing a new battery charging Glossary
A rate pricing (C-rate)
C is the capacity of the first letter used to indicate when the battery charge and discharge current size value.
For example: Charging the battery when the rated capacity of 1100 mAh, this means that for 1100mAh (1C) discharge time of 1 hour and sustainable, capable of 200mA (0.2C) discharge time of 5 hours of sustainable load control can also be calculated here.
B, the termination voltage (Cut-off Discharge Voltage)
Refers to the discharge of the battery, the voltage drop in the battery is not appropriate to continue to meet the minimum operating voltage.
Depending on battery type and conditions of different speeds, the battery capacity and the demands of life are different, therefore proposed that the termination voltage of the battery discharge is not the same.
C, open-circuit voltage (open circuit voltage OCV)
When the battery does not discharge the battery potential difference between the two poles is called the open circuit voltage.
Open circuit voltage of the battery will be in accordance with the battery positive and negative electrode materials vary with the electrolyte, the battery positive and negative electrode material exactly the same, then no matter the magnitude of the size of battery, the geometrical structure of how the change of open circuit voltage are the same.
D, depth of discharge (DOD discharge Depth)
In the battery during the battery capacity output of a percent of rated capacity is called depth of discharge.
The level of depth of discharge and the life of the secondary battery charge has a profound relationship, when the secondary battery of the deep depth of discharge, charging shorter life expectancy, and should therefore try to avoid using depth of discharge.
E, excessive discharge (discharge more)
If the battery in the discharge process, rather than the termination value of low battery voltage, but also continue to perform May cause the battery to the internal pressure is increased, material, negative positive reversibility of active lesions produce significantly reduces battery capacity.
F Overload (plus shipping)
Battery charging, in achieving full status if it continued to charge that could cause the battery to the internal pressure increases, the deformation of the battery occurred during the night, and so on, the cell performance will be significantly reduced and damage.
G, the energy density (energy density)
The average volume of unit cells or the quality of energy release.
In general, the same volume, the energy density of lithium-ion battery is a nickel-cadmium battery 2.5 times, is 1.8 times the nickel-hydride batteries, metal, thus the battery capacity equal circumstances the lithium-ion batteries will be more than nickel-cadmium, nickel-hydride batteries, metal smaller and lighter.
H, self-discharge (discharge Self)
La batterie doit être utilisé indépendamment du fait que l’Etat, pour des raisons diverses, ne donnent lieu au phénomène de la perte de sa capacité. If in a month as a unit to assess, lithium-ion battery self-discharge is about 1% -2%, Ni-MH battery self-discharge is approximately 3% -5%.
I, head of the life cycle (Life Cycle)
Charge-discharge repeated use of rechargeable batteries, the battery capacity has decreased gradually back to the initial capacity of 60-80%.
J, the memory effect (memory effect)
In the process of cell loading and unloading, the flat battery pole produces many small bubbles and over time, these bubbles will reduce the size of the battery plates, but also indirectly affect the battery capacity.