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The difference between lithium iron phosphate battery and ternary rechargeable battery 18650 3.7v
Over time, the durability and charging rates of most popular electric vehicles have improved with updates and iterations; only battery safety concerns have been an issue with electric vehicles.
In recent years, there have been reports that batteries catch fire while charging. Many people are afraid of battery charging. They have to avoid electric vehicles and car charging piles when parking for fear of fire. Buyers of electric vehicles also worry about battery cycles and battery charging safety factors.
As the key development prospect of new energy vehicles, electric vehicles have no other potential safety hazard than power batteries. Although my country has many policies and regulations on battery system optimization and battery performance, it is difficult to recognize the inherent organic chemical characteristics of batteries under some special working conditions.
Naturally, the hidden dangers of rechargeable batteries have always been a major concern for rechargeable battery manufacturers and automobile manufacturers. Taking two large-scale electric vehicle battery solutions currently on the market as examples, the safety factors, advantages and disadvantages of the two batteries are analyzed.
Lithium iron phosphate batteries are more stable
The difference in safety between lithium iron phosphate batteries and ternary lithium batteries depends on high temperature resistance, so it is easy to say who can withstand high temperatures and who has higher reliability.
In the case of lithium iron phosphate batteries, the p-o bonds in the crystal must be 700-800c to dissolve. Even in the case of severe impact, pinning and short-circuit failure, oxygen atoms will not be released and it will not easily cause strong ignition. .
Compared with ternary lithium-ion batteries, it can be dissolved at 250 to 300°C, and the electrolyte and carbon materials of the lithium-ion battery electrolyte in rechargeable batteries are dissolved.
Due to the heat resistance and organic chemistry reliability of rechargeable batteries, most early pure electric vehicles used lithium phosphate battery rechargeable batteries. High-tech Lithium-ion Battery Research (GGII) survey data showed that in 2016 and 2017, lithium phosphate battery rechargeable batteries Batteries dominate the new energy technology bus market.
But since 2017, the market share of lithium-ion batteries has just begun to catch up with lithium phosphate rechargeable batteries and has been the core of the power lithium-ion battery sales market.
Ternary rechargeable battery 18650 3.7v has higher energy density
The reason is that the energy ratio is higher than that of the new energy vehicle sales market, and the bigger reason is that its specific energy is higher than that of lithium-ion rechargeable batteries.
In this regard, many people may question whether new energy vehicle manufacturers would rather give up safer lithium phosphate rechargeable batteries and explore the option of ternary lithium-ion batteries in order to make profits.
In fact, lithium phosphate rechargeable batteries are not the best choice. According to the materials shown in bik battery, the lithium-ion battery of the 18650 rechargeable battery has a specific energy of 232wh/kg, while the lithium phosphate rechargeable battery hovers around 170-190wh/kg, plus greater energy, smaller Capacity, lighter mass, richer and more elastic, it's unmatched.
Of course, this is the cold resistance of the power rechargeable battery 18650 3.7v. As we all know, the endurance performance of battery vehicles in the natural environment with average winter temperatures is even testicular pain, and most of them can only fully utilize some of the battery characteristics. However, the main performance of lithium-iron-phosphate batteries and lithium-ion batteries at ultra-low temperatures is different. Data shows that the lithium-iron-phosphate battery at 20°C is only 54% of that at normal temperature, and lithium-ion batteries are still the main performance. Performance can reach 70% of normal temperature. In terms of cold resistance, lithium-ion batteries have better advantages, which is equivalent to their own insufficient thermal resistance.
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