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A charging cycle means that all the charge of a battery goes from full to empty, and then from empty to full, which is not the same as a single charge. A lithium-ion battery, for example, uses only half its capacity on the first day, and then recharges it. If it's still the same the next day, use half of the charge, and two total charges count as one charge cycle, not two. As a result, it may normally take several charges to complete a cycle. With each charge cycle, the capacity of the battery decreases a little.
Life span and influencing factors
The normal use of lithium iron phosphate battery should carry out partial discharge, rather than complete discharge, and try to avoid frequent complete discharge. Once the battery is off the production line, the clock starts ticking. Whether used or not, lithium-ion batteries last only a few years. The decrease in battery capacity is due to an increase in internal resistance caused by oxidation (which is the main cause of the decrease in battery capacity). Eventually, the cell's resistance reaches a point where, although the cell is fully charged, it cannot release the stored charge.
1)The service life of lithium iron phosphate battery is affected by ambient temperature and charging state.
The batteries are fully charged (i.e., 100% charged) and then stored at ambient temperatures of 0℃, 20℃, 40℃ and 60℃ for one year to measure the percentage of the battery capacity in the initial capacity.
A battery pack is stored in a full state and its life decays quickly.
2) The higher the storage temperature of the battery pack, the faster the life decay. When the temperature exceeds 40℃, the service life will decay rapidly.
3) In the state of high charge and high temperature storage, life decay rapidly, can only be stored for less than three months.
Take the same initial capacity, the same model and the same batch of batteries, divide them into the following four groups, and conduct the following experiments:
A. 1C full discharge: charge to 100% charged state, discharge to 10.8V cut-off voltage, recharge, charge and discharge using 1C current, cycle 300 times.
B. 50% half charge and half discharge (high charge) : namely, charge to 100% charged state (full) and discharge to 50% charged state, then full, charge and discharge current using 1C current, so cycle, cycle 600 times.
C. 50% half charge and half discharge (low charge) : that is, the battery is only charged to 50% full charge state, and then discharged to 3V cut-off voltage, and then charged to 50% full charge state, charge and discharge current using 1C current, so cycle, cycle 600 times.
D. 0.5C full discharge: charge to 100% charged state, then discharge to 10.8V cut-off voltage, then full, charge and discharge with 0.5C current, cycle 300 times.
To sum up, the use environment temperature, charging current, charging voltage, discharge cut-off voltage, use mode, storage state of charge, storage environment temperature and charging mode of 32650 lithium iron phosphate battery all have an impact on the life attenuation of lithium ion battery. The influence degree of life attenuation is as follows: Ambient temperature, charging voltage, charging overcurrent, overdischarge, state of charge, charging mode, use mode.
Therefore, to ensure the service life of lithium iron phosphate for 5 years, the battery is used at 0℃-40℃, while avoiding the phenomenon of overcharge and overdischarge of the battery. Front-end camera peak power consumption: ≤12W; Online acquisition power consumption: ≤3.5W; Static power consumption online: ≤0.5W As long as the battery ≥20AH, according to the southern cloudy day rainy day calculation, generally in 3 days or so the battery may appear too put phenomenon, that is to say, a use cycle. Possible for 3 to 4 times a month, is three to four cycles, 56 times a year cycles, 5 years 280 cycles, fully consider the environmental temperature, charging current, charging voltage, discharge cut-off voltage, use, store the charged state, store the environmental factors such as temperature, charging mode, lithium iron phosphate batteries can be used for five years.
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