How about lithium iron phosphate batteries?
1. Internal structure of lithium iron phosphate battery
Lithium iron phosphate battery is a lithium battery pack that uses lithium iron phosphate (LiFePO4, LFP for short) as the positive electrode of the battery. Its internal structure is shown in Figure 1. Show:
On the left is LiFePO4 with olivine structure as the positive electrode of the battery, which is connected to the positive electrode of the battery by aluminum foil, and the polymer separator in the middle separates the positive electrode from the negative electrode, but lithium ion Li+ can pass through. The electron e- cannot pass. On the right is the negative electrode of the battery composed of carbon (graphite), which is connected to the negative electrode of the battery by copper foil.
Between the upper and lower ends of the battery is the electrolyte of the battery, and the battery is hermetically sealed by a metal shell, aluminum-plastic composite film or a plastic shell.
II. Advantages and disadvantages of lithium iron phosphate batteries
The advantages of LfePo4 batteries:
1. Ultra-long life, long-life lead-acid battery cycle life About 300 times, the highest is 500 times. The domestically produced lithium iron phosphate power battery has a cycle life of more than 2000 times, and the standard charge (s hour rate) can reach 2000 times. Lead-acid batteries of the same quality are new for half a year, old for half a year, and for maintenance and maintenance for half a year, at most 1-15 years, while lithium iron phosphate batteries used under the same conditions will reach 18 years. Comprehensive consideration, the performance-price ratio will be more than: times that of lead-acid batteries.
2. It is safe to use. Lithium iron phosphate completely solves the potential safety hazards of lithium sulphate and lithium manganate. Lithium sulphate and lithium manganate can be purchased at a high price of thiazide gold to be cooked. Bao Shengyu Kexin poses a threat, and lithium iron phosphate has passed strict safety tests.
3, it can be charged and discharged quickly with high current ac. With a dedicated charger, the battery can be charged within 30 minutes at 5c Fully charged, the starting current can reach 35c, but the lead-acid battery does not have this performance now.
4. High temperature resistance, the peak value of lithium iron phosphate electric heating can reach 350℃-500℃, while lithium manganate and lithium sulphate are only around 200℃.
5. Large capacity.
6. No memory effect.
7. Green and environmental protection.
Disadvantages of Lifepo4 battery: poor electrical conductivity and poor low-temperature performance.
Three. Application fields of lithium iron phosphate batteries
Large electric vehicles: buses, electric vehicles, tourist attractions and hybrid vehicles, etc.;
Lightweight Electric vehicles: electric bicycles, golf carts, small flat battery carts, forklifts, cleaning vehicles, electric wheelchairs, etc.;
UPS and emergency lights, warning lights and miner's lamps (the best safety);>
Electric tools: electric drills, chainsaws, lawn mowers, etc.;
Model fields: remote control cars, boats, airplanes and other toys;
Small medical equipment and portable instruments ;
Replace the 3V disposable lithium battery pack in the camera and the 9V nickel-cadmium or nickel-metal hydride rechargeable battery (the same size);
energy storage equipment for solar and wind power generation, etc. .
Related articles about lithium iron phosphate batteries:
Working principle diagram of lithium iron phosphate batteries
CCS certified solar lithium iron phosphate batteries factory inspection requirements
48V lithium iron phosphate battery
Low temperature lithium iron phosphate battery
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