How to choose the best lifepo4 portable power station
At present, the batteries of portable power stations are still mainly ternary lithium batteries and lithium iron phosphate batteries. There are only a small number of semi-solid batteries, and the installed capacity is not high. Ternary lithium-ion batteries and lifepo4 batteries are the two most widely used types of lithium-ion batteries. They each have some advantages and disadvantages and can be selected according to specific application scenarios.
Advantages of ternary lithium-ion batteries:
1. High energy density: The energy density of ternary lithium batteries is high, which can provide higher energy storage capacity and is suitable for some applications with high energy density requirements, such as portable power station.
2. Fast charging speed: Compared with other types of lithium-ion batteries, ternary lithium batteries have faster charging speeds.
Disadvantages of ternary lithium-ion batteries:
1. High cost: Compared with lifepo4 batteries, ternary lithium batteries have higher manufacturing costs.
2. Poor safety: Under extreme conditions, such as high temperature environments, the safety of ternary lithium batteries is relatively poor.
3. Large size and weight: The energy density of ternary lithium batteries is higher, but at the same energy capacity, their size and weight are usually larger than lifepo4 batteries. lifepo4 batteries are lithium-ion batteries that use lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material.
Advantages of lifepo4 battery:
1. Good safety: lifepo4 batteries have more advantages than ternary batteries. The reason is that the nickel-cobalt-aluminum 18650 battery in the ternary material will self-heat when it exceeds 180°C, and it is difficult to control after catching fire, while lifepo4 materials will not release heat until 250°C.
2. Low cost: In terms of battery cost, lifepo4 batteries also have huge advantages. It does not have precious metals (nickel and cobalt metal elements), so the production cost is lower. Ternary lithium batteries use a variety of materials such as nickel, cobalt and manganese, and the production of high-nickel batteries requires a relatively strict process environment, and the current cost is relatively high.
3. Environmental protection: lifepo4 battery materials have low cost and do not contain heavy metals, so they are environmentally friendly batteries.
4. Cycle life: lifepo4e battery is better than ternary lithium battery. The theoretical life of ternary lithium battery is 2000 times, but basically after 1000 cycles, the capacity decays to 60%; even the best brand in the industry, Tesla, can only maintain 70% of the power after 3000 times, while the lifepo4e battery has 80% of the capacity after the same cycle.
Disadvantages of lifepo4 battery:
1. Relatively low energy density: The theoretical energy density of lifepo4 power battery is limited. The energy density of lithium iron phosphate battery monomer is 120Wh/kg, and the energy density after grouping is 80Wh/kg. Therefore, companies are actively developing new power lithium batteries with higher energy density of lithium iron manganese phosphate materials. The energy density of ternary batteries is higher. The energy density of ternary lithium batteries is 180Wh/kg, and the energy density after grouping is 110Wh/kg, and the corresponding market advantages are obvious. Therefore, in terms of energy density, ternary lithium batteries are better than lifepo4 batteries, but the weight of batteries with the same capacity is also larger.
2. Slow charging speed: ternary lithium batteries are higher. Lithium battery charging adopts the current limiting and voltage limiting method, that is, constant current charging is performed in the first stage, at which time the current is large and the efficiency is high. After the constant current charging reaches a certain voltage, it enters the second stage of constant voltage charging, at which time the current is small and the efficiency is low. Therefore, the ratio of the constant current charging power to the total battery capacity is used to measure the charging efficiency of the two, which is called the constant current ratio. Experimental data show that there is not much difference between the two when charging under 10C conditions, but the difference will be widened above 10C. When charging at 20C, the constant current ratio of the ternary lithium battery is 52.75%, and the constant current ratio of the lifepo4 battery is 10.08%, and the former is 5 times that of the latter.
When choosing to use ternary lithium-ion batteries and lifepo4 batteries, it is necessary to weigh and select according to the specific application requirements to meet different requirements for energy density, safety, cost and cycle life.
Generally speaking, the theoretical energy density of lifepo4 batteries is limited, and there is not much room for improvement. lifepo4 is better at high temperature resistance, while ternary lithium is better at low temperature resistance. lifepo4 battery is safer and has a longer lifespan. Because both have their own advantages and disadvantages, their application areas are also different. Power station companies should pay more attention to battery safety, strengthen production monitoring, and strictly ensure quality to ensure the safety of lifepo4 portable power stations and the personal safety of passengers.
I purchased a power station of the SOUOP brand, and they chose the best lifepo4 portable power station.
