1. What are the commonly used power batteries?
1. Lithium iron phosphate battery
Advantage:
① Stable chemical structure, safe to use;
② Long service life, under standard conditions (working temperature of 25 ℃, charge and discharge rate of 0.5C), the number of cycles can reach more than 6000 times;
③ Large rate charge and discharge: standard discharge is 2 ~ 5C, continuous high current discharge can reach 10C, applied to new energy vehicles, the discharge rate can reach up to 25C, fully meet the needs of large energy storage, new energy vehicles and other electrical equipment various needs;
④ Good high temperature resistance;
⑤ Environmental protection, non-toxic, non-polluting: does not contain any heavy metals and rare metals (Ni-MH batteries require rare metals), non-toxic (SGS certified), non-polluting, in line with European RoHS regulations, is an absolute green battery;
⑥ Wide range of raw materials and cheap price: iron (Fe) element is one of the most abundant metal elements in the earth's crust;
Shortcoming:
① The tap density (bulk density) is small;
② Poor low temperature performance: Under low temperature conditions, the performance of the battery will be affected to a certain extent;
2. Ternary lithium battery
Advantage:
① High voltage platform: The voltage platform is an important indicator of battery energy density, which determines the basic performance and cost of the battery, so the selection of battery materials is of great significance;
② High energy density (energy contained in a unit volume);
③ High tap density (bulk density);
Shortcoming:
① Poor safety: The temperature of the battery rises sharply after high-power charging and discharging, and the release of oxygen after high temperature is extremely easy to burn;
② Poor high temperature resistance: Under high temperature conditions, battery performance will be affected to a certain extent;
③ Short service life: Under standard conditions (working temperature of 25 ℃, charge and discharge rate of 0.5C), the service life is 2000~3000 times;
④ Poor performance of high-rate charging and discharging: In the case of high-rate charging and discharging, the battery life drops sharply;
3. Lead-acid battery
Advantage:
① Good performance;
② Shock-resistant, impact-resistant, not easy to damage.
③ Easy maintenance and maintenance;
Shortcoming:
① Bulky, low energy density;
② There are a lot of lead and a lot of acid in the battery. If it is not disposed of properly after being discarded, it will pollute the environment;
2. Why choose lithium iron phosphate battery for energy storage system?
1. Good security:
The P-O bond in lithium iron phosphate crystal is stable and difficult to decompose. Even at high temperature or overcharge, it will not collapse and generate heat like lithium cobalt oxide or form strong oxidizing substances; even if the battery is damaged internally or externally (fire, short circuit) , acupuncture, impact, furnace heat, extrusion, etc.), it will not burn or explode; it has very good safety. It can still operate normally at a temperature of 800 °C.
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2. Long service life:
According to the working temperature of 25 ℃ and the charge and discharge rate of 0.5C, the cycle life of lithium iron phosphate battery can reach more than 6000 times. If a smaller discharge rate (about 0.3C) is used, its life will be longer, up to 10000 times ; Of course, lithium iron phosphate batteries can also meet the high-rate charge and discharge, so as to meet the current needs of new energy vehicles and large-scale energy storage. There is no damage after over-discharging to 0 V, and the battery performance can be restored after normal charging;
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3. Comprehensive cost-effective:
Lithium iron phosphate battery combines its safety and environmental protection [does not contain any heavy metals and rare metals (Ni-MH batteries require rare metals), non-toxic (SGS certified), non-polluting, in line with European RoHS regulations, is an absolute green battery ], DOD depth of discharge (up to 100%), long service life and other factors make it very cost-effective.