Factors of low temperature characteristics of lithium iron phosphate battery

Although lithium iron phosphate batteries have great advantages in terms of cycle life and battery multiple compared with other batteries, their performance is slightly reduced under low temperature conditions. Therefore, improving and improving the low-temperature characteristics of lithium iron phosphate batteries can more effectively improve their competitiveness.

First, the positive electrode material selected in the lithium iron phosphate battery for the positive stage has a weak electronic conductivity and is prone to electric polarization, thereby reducing the volume of the lithium battery.

Second, the negative level of the lithium battery is very harmful to low-temperature battery charging, and will endanger the safety factor of the rechargeable battery.

Third, lithium battery electrolyte lithium iron phosphate battery under low temperature standards, the viscosity of the internal lithium battery electrolyte increases, thereby increasing the characteristic impedance of lithium ion battery transfer.see more:diy home energy storage

Ways to improve and improve the low temperature characteristics of lithium iron phosphate batteries

  1. The three elements of positive electrode particle size, resistance and resistance, from the positive stage of lithium iron phosphate rechargeable batteries, will affect the low temperature characteristics of rechargeable batteries. The low-temperature charge and discharge characteristics of lithium batteries can be improved through the positive stage production process. Increasing the length of the plane axis can expand the transfer channel of the lithium-ion battery, which is beneficial to increase the volume of the battery. According to research, the low-temperature charge and discharge characteristics of lithium iron phosphate batteries can release 914 particles at minus 20°C, and the particle size is 100-200nm. The nanotechnology of particles can reduce the transfer path of particles, thereby improving its low-temperature charge and discharge. characteristic.
  2. Negative electrode For lithium iron phosphate batteries charged by low-temperature batteries, the negative electrode is the most harmful, and the key lies in the change of negative electrode particle size and negative electrode interval. Human high-purity graphite is a battery positive electrode material with different layer distances and particle sizes. The particle high-purity graphite layer with a large layer distance has slightly smaller characteristic impedance and positive ion transfer characteristic impedance from the perspective of the antigen. Because the distance between synthetic graphite layers is enlarged and the particle size is reduced, low-temperature constant-current battery charging has greatly improved lithium iron phosphate batteries.Check:72v 200ah lithium battery pack
  3. Lithium battery electrolyte When the temperature drops to minus 20°C or lower, the electrolyte of lithium iron phosphate batteries is prone to problems such as freezing, increased viscosity, and malignant changes in characteristics. Experiments have shown that the damage of organic solvents to the low temperature of rechargeable batteries varies from 70% to 90%, reaching more than a dozen points. In addition, different lithium salts also have a certain impact on the charging performance of the battery. Experiments have found that if only the additive is changed, the low-temperature additive can increase the charge-discharge capacity of the battery from 8% to 90%.

The above exemplifies several ways and key points to improve and enhance the low-temperature characteristics of lithium iron phosphate batteries. The key point is the composition of the internal raw materials of the rechargeable battery. In fact, in order to improve the performance of lithium iron phosphate batteries at lower temperatures quickly and quickly, not only must the internal components of the battery be improved, but also through various methods, such as battery intelligent management system, overall cycle system, etc., to improve its high efficiency.

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