1 Humidity resistance
The characteristic of the humidity sensitive resistor is that the substrate is covered with a film made of a moisture-sensitive material. When the water vapor in the air is adsorbed on the moisture-sensitive film, the resistivity and resistance value of the element will change. The humidity can be measured. There are many types of humidity sensitive resistors, such as metal oxide special humidity sensitive resistors, silicon humidity sensitive resistors, ceramic humidity sensitive resistors, etc. The advantage of a humidity sensitive resistor is its high sensitivity. The main disadvantage is its poor linearity and poor product interchangeability.
2 Humidity capacitance
Moisture-sensitive capacitors are generally made of polymer film capacitors. Commonly used polymer materials are polystyrene, polyimide, and acid acetate. When the environmental humidity changes, the dielectric constant of the humidity-sensitive capacitor changes, so does its capacitance. The amount of capacitance change is proportional to the relative humidity. The main advantages of humidity sensitive capacitors are high sensitivity, good product interchangeability, fast response speed, small hysteresis of humidity, easy manufacturing, easy miniaturization and integration, and its accuracy is generally lower than that of humidity sensitive resistors. The main foreign manufacturers of humidity sensitive capacitors include Humirel, Philips, and Siemens. Taking the SH1100 type humidity sensitive capacitor produced by Humirel as an example, the measurement range is (1% to 99%) RH, and the capacitance at 55% RH is 180pF (typical value). When the relative humidity changes from 0 to 100%, the change range of capacitance is 163pF ～ 202pF. The temperature coefficient is 0.04pF / ℃, the humidity hysteresis is ± 1.5%, and the response time is 5s.
In addition to resistive and capacitive humidity sensors, there are electrolyte ion humidity sensors, weight humidity sensors (using changes in the weight of the moisture sensitive film to change the oscillation frequency), light intensity humidity sensors, and surface acoustic wave Humidity sensor, etc. The humidity sensor has poor linearity and anti-pollution properties. When detecting environmental humidity, the humidity sensor must be exposed to the environment to be tested for a long time, which is easily contaminated and affects its measurement accuracy and long-term stability.
LiFePO4 Battery Pack refers to a battery pack that uses lithium iron phosphate (LiFePO4) as the positive electrode material, which is a common lithium-ion battery. LiFePO4 battery has been widely concerned and applied due to its advantages of high safety, long life, high energy density, and environmental protection.
Main effect:
Energy storage: The main function of the LiFePO4 Battery Pack is to store energy and store electrical energy so as to supply electricity to electrical equipment when needed. It can store electricity from solar panels or other power sources, and then supply power at night or when solar radiation is low.
Smooth power output: LiFePO4 battery has good power characteristics, can output power smoothly, and maintain a stable power supply. It can adjust and supplement power fluctuations to ensure the continuity and stability of the power supply.
Provide backup power: LiFePO4 Battery Pack can be used as a backup power source for power outages or emergencies, providing continuous power to critical equipment.
Differences from Solar Battery Pack:
Solar Battery Pack is a more general concept that refers to the overall unit formed by combining multiple solar battery cells. This battery pack can utilize different types of battery technologies, including lithium-ion batteries, lead-acid batteries, and more.
The LiFePO4 Battery Pack is a specific type of Solar Battery Pack, which refers to a solution that uses a lithium iron phosphate battery as a battery pack. Therefore, LiFePO4 Battery Pack is a subset of the Solar Battery Pack.
In general, LiFePO4 Battery Pack is a specific type of solar battery pack, which uses lithium iron phosphate lithium battery, which has the advantages of high safety and long life and is suitable for energy storage applications of solar power generation. The Solar Battery Pack is a broader concept, including all battery packs used to store solar energy or other energy, of which the LiFePO4 Battery Pack is just one of the implementations.
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