Since the advent of lithium batteries, around its research, development work has been ongoing, the late 90s of last century and the development of lithium polymer battery, after 2002, the introduction of lithium iron phosphate battery
Lithium iron phosphate full name should be lithium iron phosphate lithium-ion battery, this name is too long, referred to as lifepo4 battery. Because of its performance is particularly suitable for dynamic applications, the name of the "power" word, that is, lithium iron phosphate power battery. Some people call it "lithium iron (LiFe) power battery."
As a rechargeable battery requirements are: high capacity, high output voltage, good charge and discharge cycle performance, stable output voltage, high current charge and discharge, electrochemical stability, the use of safety (not due to overcharge, over discharge and short circuit Such as improper operation caused by combustion or explosion), wide operating temperature range, non-toxic or less toxic, no pollution to the environment. LiFePO4 used as a cathode of lithium iron phosphate battery in these performance requirements are very good, especially in the discharge rate of discharge (5 ~ 10C discharge), the discharge voltage is stable, safe (not burning, not explosion), life The number of times), on the environment pollution-free, it is the best, is the best high-current output power battery.
LiFePO4 battery main performance
LiFePO4 battery nominal voltage is 3.2V, termination charge voltage is 3.6V, the termination voltage is 2.0V. As the various manufacturers using the positive and negative materials, electrolyte quality and process of different materials, the performance will be some differences. For example, the same model (the same package of standard batteries), the battery capacity is quite different (10% to 20%).
Characteristics of lithium iron phosphate battery
Through the above description, LiFePO4 battery can be summarized the following characteristics.
High efficiency output: standard discharge is 2 ~ 5C, continuous high current discharge up to 10C, instantaneous pulse discharge (10S) up to 20C;
High temperature performance: the external temperature of 65 ℃, the internal temperature is as high as 95 ℃, the battery discharge temperature up to 160 ℃, the battery structure is safe, intact;
Even if the battery internal or external damage, the battery does not burn, do not explode, the best security;
Excellent cycle life, after 500 cycles, the discharge capacity is still greater than 95%;
Over-discharge to zero volts and no damage;
Can be quickly charged;
No pollution to the environment.
lithium iron phosphate power battery application
As the lithium iron phosphate battery has the above characteristics, and produce a variety of different capacity of the battery, soon to be widely used. Its main application areas are:
Large electric vehicles: buses, electric vehicles, tourist attractions and hybrid vehicles, etc.;
Light electric vehicles: electric bicycles, golf carts, small flat-panel car battery, forklifts, clean cars, electric wheelchairs, etc .;
Electric tools: electric drill, electric saw, lawn mower, etc.
Remote control cars, boats, aircraft and other toys;
Solar energy and wind energy storage equipment;
UPS and emergency lights, warning lights and Miner'slamps (the best security);
Replace the 3V primary lithium battery and the 9V NiCd or NiMH rechargeable battery in the camera (the dimensions are the same);
Small medical equipment and portable instruments.
Here to give an example of using lithium iron phosphate power battery instead of lead-acid battery applications. Using 36V / 10Ah (360Wh) of lead-acid batteries, the weight of 12kg, charge a power can walk about 50km, the number of charge about 100 times, the use of time about 1 year. If the use of lithium iron phosphate battery, using the same 360Wh energy (12 10Ah battery series composition), its weight of about 4kg, charging time can walk 80km or so, the number of up to 1,000 times the charge, the service life of up to 3 to 5 years. Although the price of lithium iron phosphate power battery is much higher than the lead-acid batteries, but the overall economic effect is better use of lithium iron phosphate power battery, and the use of more lightweight.