Sunfree Lighting Limited is a high-tech manufacturer specialized in R&D and production of solar led street light

How to improve the led lights in cold weather with lithium iron phosphate batteries

by:SUNFREE     2021-01-29
This is in November, the air temperature has dropped to a few degrees below zero or even, this is the light emitting diode ( 领导) Street lamp performance test at low temperature. LED lights factory it is a solid cold light source, green pollution-free, less power consumption, high photosynthetic efficiency, long life, therefore, the LED street lamp will become the choice of road lighting energy saving transformation. LED street lamp which is a kind of based on semiconductor PN junction formation with a weak electricity can glowing efficient solid-state light source, in certain positive bias voltage and the electrical flow injection, injection of holes and injection P N the electronic after spread to have source area by the radiative recombination and emit photons, convert electrical energy directly into light energy. How to improve the low temperature performance of lithium iron phosphate battery pack? As is known to all, good high temperature performance of lithium-ion battery pack, hot peak of up to 350 ~ 500 ℃, high temperature ( 60℃) Still can discharge 100%. LED street lamp which is a kind of based on semiconductor PN junction formation with a weak electricity can glowing efficient solid-state light source, in certain positive bias voltage and the electrical flow injection, injection of holes and injection P N the electronic after spread to have source area by the radiative recombination and emit photons, convert electrical energy directly into light energy. But how to improve the low temperature performance of three-way lithium battery system?
the lithium iron phosphate battery:
the lithium iron phosphate battery is refers to the use of lithium iron phosphate as the anode material of lithium ion batteries. Lithium ion battery anode materials mainly include cobalt acid lithium manganese acid lithium, nickel acid lithium, ternary material, lithium iron phosphate, etc. Lithium iron phosphate is most used in lithium ion battery anode material. Surging demand for lithium iron phosphate battery, is very important to improve the low temperature performance of lithium-ion batteries.
the influence factors of lithium iron phosphate battery low temperature have?
packing for lithium iron phosphate batteries, electric industry experts made a more detailed study on characteristics of low temperature, the reasons are as follows:
1. Production: lithium iron phosphate lithium-ion battery pack is a kind of chemical raw materials, process more complicated high-tech products. Production environment of temperature, humidity, dust, etc have very high demand, if not reach the designated position, the battery quality will fluctuate.
2。 Poor electrical conductivity, lithium ion diffusion is slow. When the charge and discharge, the actual low specific capacity, this problem is restricting the development of lithium iron phosphate industry. Not so widely used lithium iron phosphate is a major problem.
3. Material impact, the electrical conductivity of the lithium iron phosphate cathode itself more bad, in addition, the polarization extremely easily, reduce the play ability; Negative charge mainly in low temperature, because it can affect safety issues; Electrolyte, this piece could increase viscosity under low temperature, lithium ion migration resistance will increase; It is a binder, the low temperature had a greater influence on the performance of the battery.
how to improve the low temperature performance of lithium iron phosphate batteries?
we from the anode, cathode, electro-hydraulic and binder four parts to discuss how to improve the low temperature performance of lithium iron phosphate battery pack. 。
in positive ways, it is now a nanoscale. Its size, resistance and AB plane axial length affect the low temperature properties of the battery. The influence of different process on the anode. Made of lithium iron phosphate particle size is 100 to 200 nm of the low temperature of battery discharge features better, and in - Can release 94% 20 degrees, the particle size of nanometer shortens the migration path. Due to the discharge of the lithium iron phosphate is mainly associated with the anode, so low temperature discharge performance is also improved.
considering the lithium battery charging characteristics of the cathode, the low temperature of the lithium battery charging mainly influenced by the cathode, including the change of particle size and the change of the negative electrode spacing. Choose three different types of artificial graphite as the cathode, studied the different layer spacing and particle size on the influence of the low temperature performance.

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