How to improve lithium iron phosphate battery for solar led street lamp in cold weather
This is in November, and the air temperature has dropped to several degrees or even below zero. This is a test of the low-temperature performance of light-emitting diode (LED) solar led street lamp. solar led street lamp manufacturers are a kind of solid-state cold light source, which has the characteristics of environmental protection, no pollution, low power consumption, high luminous efficiency, and long life. Therefore, solar led street lamp will become the choice for energy-saving road lighting. solar led street lamp is a kind of high-efficiency solid-state light source formed by semiconductor PN junction that can emit light with weak electric energy. Under a certain forward bias voltage and injection current, the holes injected into the P zone and the electrons injected into the N zone are in After being diffused to the active area, photons are emitted through radiation recombination, which directly converts electrical energy into light energy. How to improve the low temperature performance of lithium iron phosphate battery pack? As we all know, the high temperature performance of lithium battery pack is excellent, the heat peak can reach 350~500℃, and the high temperature (60℃) can still discharge 100%. LED street light is a kind of high-efficiency solid-state light source formed by semiconductor PN junction that can emit light with weak electric energy. Under a certain forward bias voltage and injection current, the holes injected into the P zone and the electrons injected into the N zone are in After being diffused to the active area, photons are emitted through radiation recombination, which directly converts electrical energy into light energy. But how to improve the low temperature performance of the three-way lithium battery system?
Lithium iron phosphate battery:
Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as a positive electrode material. The cathode materials of lithium-ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate and so on. Among them, lithium iron phosphate is the cathode material used in most lithium-ion batteries. The soaring demand for lithium iron phosphate battery packs is critical to improving the low temperature performance of lithium batteries.
What are the factors that affect the low-temperature performance of lithium iron phosphate battery packs?
For the packaging of lithium iron phosphate batteries, electrical industry experts have done a more detailed study on the low-temperature characteristic factors, the reasons are as follows:
1. Production environment: Lithium iron phosphate battery pack is a high-tech product with many chemical raw materials and complex technology. The production environment has high requirements for temperature, humidity, dust, etc. If it is not in place, the battery quality will fluctuate.
2. Poor conductivity and slow diffusion of lithium ions. When charging and discharging at a high speed, the actual specific capacity is low. This problem is the difficulty that restricts the development of the lithium iron phosphate industry. The reason why lithium iron phosphate is not so widely used is a major problem.
three. Material impact, the conductivity of the lithium iron phosphate cathode itself is relatively poor, in addition, it is extremely easy to polarize, reducing the playback ability; the negative electrode is mainly charged at low temperature, because this will affect the safety problem; in the electrolyte, this piece may increase At low temperatures, the viscosity is large, and the resistance to lithium ion migration will increase; one is the binder, which has a greater impact on the low-temperature performance of the battery.
How to improve the low temperature performance of lithium iron phosphate batteries?
We discuss how to improve the low-temperature performance of lithium iron phosphate battery packs from four parts: positive electrode, negative electrode, electro-hydraulic and binder..
●On the positive side, it is now nanoscale. Its particle size, resistance and the axial length of the AB plane affect the low temperature characteristics of the entire battery. Different processes have different effects on the positive electrode. A battery made of lithium iron phosphate with a particle size of 100 to 200 nanometers has better low-temperature discharge characteristics, and can release 94% at -20 degrees, that is, the nanometerization of the particle size shortens the migration path. Since the discharge of lithium iron phosphate is mainly related to the positive electrode, the performance of low-temperature discharge is also improved.
Benwei Solar Street Lights Outdoor Lamp
Product Features:
>LED light, solar panel, lithium battery and controller,all in one compact design.
>No wiring,100% solar powered ,easy to install and ship.
>Built-in infrared sensor,can adjust the light output automatically(time control + light sensor control+ motion sensor control).
>Rust-proof, dustproof and waterproof IP65.
>5 years warranty.
Taking into account the charging characteristics of the negative electrode of a lithium battery, the low-temperature charging of a lithium battery is mainly affected by the negative electrode, including the change of particle size and the change of the distance between the negative electrodes. Three different kinds of artificial graphite were selected as the negative electrode, and the influence of different layer spacing and particle size on its low-temperature performance was studied.
