At present, the lithium iron phosphate batteries on the market are marked with a cycle life of about 2000 times. This refers to the ideal number of stable normal low current charge and discharge and application in normal temperature environment, but in fact, under different usage conditions, the real life cycle of lithium iron phosphate batteries The numbers are different. This mainly talks about the service life of several different uses.
Lithium iron phosphate battery is used in normal temperature environment
(1) Small current charge and discharge
The use in this case is basically used in 3C electronic products. If the lithium iron phosphate battery is used normally in this field, if the battery brand manufacturer is relatively strong and the quality is good, it is basically 2000 times. The above cycle life; small lithium battery manufacturers have a cycle life of more than 1,000 times with a lower quality;
(2) High rate stable charge and discharge use
Most of the applications of high-rate discharge are power-type lithium batteries, and most of them are used in applications that provide power to motors, such as new energy vehicles, electric vehicles, and fishing boat electromechanical power supplies. Because most lithium iron phosphate batteries operate under high load conditions, the decay time of battery materials is accelerated, and the cycle life is drastically reduced. Poor quality batteries may only have about 500 cycles; strong battery brand manufacturers, in The equipment technology and material application will be better, and the quality of the battery will be better, but the cycle life will be about 800 times.
(3) High rate unstable charge and discharge use
It is thought that the lithium iron phosphate battery used in this case will have a shorter lifespan, and it will be scrapped about 300 times. The unstable discharge used by the battery, which is high and low, will have a greater effect on the attenuation of the battery.
Lithium iron phosphate battery used in high temperature environment
The high-temperature performance of lithium iron phosphate batteries is not very mature at present. The operating temperature is -20°C to 125°C. This temperature range is the theoretical value, and the actual application temperature range is smaller.
(1) Small current charge and discharge
In this field, if the lithium iron phosphate battery is used normally, if the battery brand manufacturer is relatively strong and the quality is good, the cycle life is basically more than 1000 times; The cycle life of more than two times; because the use of high temperature, the damage to the battery is relatively large.
(2) High rate stable charge and discharge use
Most of the applications of high-rate discharge of batteries in high temperature environments are power-type lithium batteries, and most of them are used to provide power to motors. The cells produced by domestic powerful lithium battery manufacturers are mostly used in new energy vehicles and electric vehicles. , fishing boat electromechanical power supply, etc., battery manufacturers with poor strength are mostly used in some relatively small fields, such as medical treatment, boiler equipment startup, etc.
Because most lithium iron phosphate batteries operate under high load conditions, the decay time of battery materials is accelerated, and the cycle life is sharply reduced. Poor quality batteries may only have about 300 cycles; strong battery brand manufacturers, in The equipment technology and material application will be better, and the quality of the cell will be better, but the cycle life will be about 500 times.
(3) High rate unstable charge and discharge use
Unstable operation at high temperature and discharge rate will cause more damage to the battery and a relatively low cycle life. Tests on the cells of several battery manufacturers have found that the battery is basically unusable after 250 to 300 times.
Lithium iron phosphate battery used in low temperature environment
The low temperature environment has a greater impact on the performance of lithium iron phosphate batteries than high. According to the current market situation, lithium iron phosphate batteries work below -20 °C to -40 °C, the life span is significantly reduced, and the discharge current range is 0.2C To 1C, the discharge capacity is 50% to 60%, and the temperature is also low, the worse the discharge capacity. Therefore, there are not many mature low-temperature lithium iron phosphate batteries on the market now, with a temperature range of -20°C to 55°C and a cycle life of about 300 times.
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