People's requirements for camping equipment are also getting higher and higher. In addition to basic items such as tents, sleeping bags, folding tables and chairs, the importance of outdoor power sources has also become increasingly prominent.
In addition to paying attention to power, battery capacity, number and type of interfaces when choosing an outdoor power supply, safety is gradually becoming a very important point for users. So, what kind of outdoor power supply is safe?
In general, outdoor power supplies have multiple safety protections. In addition to basic overvoltage, overcurrent, and short-circuit protection functions, the internal battery is the most critical part of outdoor power supply security.
At present, there are two main types of batteries used in outdoor power supplies on the market: power station lifepo4 and ternary lithium batteries. What is the difference between these two batteries? Which kind of battery will be better for outdoor power supply security?
The difference between power station lifepo4 and ternary lithium battery
different cathode materials
power station lifepo4 is a lithium-ion battery that uses lithium iron phosphate as the positive electrode material and carbon as the negative electrode material; while the positive electrode of the ternary lithium battery is made of nickel-cobalt lithium manganese oxide or nickel-cobalt lithium aluminate ternary positive electrode material , Graphite is the negative electrode material, and the lithium salt based on lithium hexafluorophosphate is used as the lithium battery of the electrolyte.
different energy densities
The average energy density of power station lifepo4 is about 160Wh/kg, but it can reach 185Wh/kg if the technology is mature enough and the capacity is large enough; while the energy density of ternary lithium batteries is generally 200Wh/kg or above. In other words, with the same weight of batteries, the energy released by the ternary lithium battery is slightly higher than that of the power station lifepo4, which means that for the same 100Wh product, the product based on the ternary lithium battery is smaller.
Different security features
In low temperature environment, the performance of power station lifepo4 will be lower than that of ternary lithium battery. Relevant studies have shown that when the temperature is -20 degrees, the ternary lithium battery can release 70.14% of the capacity, while the power station lifepo4 can only release 54.94%. But in a high temperature environment, the safety of power station lifepo4 is obviously better than that of ternary lithium battery.
Since lithium iron phosphate has an olivine crystal structure, its electrochemical performance is relatively stable, and its thermal runaway temperature can reach up to 800 degrees. , its stability is still very high, it is difficult to cause open flames and explosions, and it is extremely safe.
However, the stability of ternary lithium batteries is very poor, and the thermal runaway temperature is generally lower than 300 degrees, and some high-nickel batteries are even lower than 200 degrees, so the safety is weak. In many new energy vehicle spontaneous combustion accidents, most of them use ternary lithium batteries.
different cycle life
Generally, the higher the number of cycles, the longer the outdoor power supply can be used.
The cycle times of power station lifepo4 can generally reach more than 2000 times, and some can even reach 3000 times. The cycle times of ternary lithium batteries are mostly between 1000-1500 times. Although it is much higher than traditional lead-acid batteries, there is still a significant gap compared with lithium iron phosphate.
There are also many outdoor power supplies on the market that use lithium iron phosphate as the internal battery. Take the 600W Green Star outdoor power supply launched by Greenlink a while ago as an example. The battery used inside it is lithium iron phosphate, and according to official information, this outdoor power supply was jointly developed with BYD. The combination of leading companies in the digital field and the new energy vehicle field is definitely guaranteed in terms of quality alone.
