A Battery Management System (BMS) is any electronic system that manages a rechargeable battery (cell or battery pack), such as by protecting the battery from operating outside its Safe Operating Area, monitoring its state, calculating secondary data, reporting that data, controlling its environment, authenticating it and / or balancing it.
A battery pack built together with a battery management system with an external communication data bus is a smart battery pack. A smart battery pack must be charged by a Smart Battery Charger.
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LED outdoor board basics
The LED screen (outdoor billboard, display screen) can be divided into two types according to different application places: outdoor billboards and outdoor screens. Since the application environment of the LED outdoor billboard is different from the indoor screen, and the environmental conditions are relatively harsh, the LED material has a high requirement for the luminescent material and the cabinet. In general, LEDs for outdoor kanbans must be super bright luminescent materials, and bright height (UHB) refers to LEDs with luminous illuminance of 100 mcd or more, also known as candela (cd) LEDs. The development of high-brightness A1GaInP and InGaN LEDs is progressing rapidly, and has reached the performance level that conventional materials GaA1As, GaAsP, and GaP cannot achieve.
At present, the three primary colors of red, green, blue, and orange and yellow LEDs of color display have reached the candela-level luminous intensity, achieving ultra-high brightness and full color, and making the outdoor full color of the luminous tube. The display becomes a reality. The brightness of the light is higher than 1000mcd, which can meet the needs of outdoor all-weather and full-color display. The LED color large screen can express the sky and the ocean and realize 3D animation. A new generation of red, green and blue ultra-high brightness LEDs have achieved unprecedented performance.
The outdoor kanban pixels are currently composed of many single-tube LEDs of three primary colors (primary colors) of red/green/blue. The commonly used finished products have two structures of a pixel tube and a pixel module. The pixel size is mostly 12-26 mm, and the pixel composition is: 2R/3R/4R for monochrome, 1R2YG/1R3YG/1R4YG for pseudo color, and 2R1G1B for true color.
First, the principle of outdoor kanban system design
1, structural design principles
2. Brightness and color matching basis
3. Reliability design principles
4. Safety design principles
5. Easy to manage and operability design principles
Second, the screen installation method
Wall-mounted: The back of the screen is displayed against the wall and fixed to the wall. This method is a common method and is easier to implement.
Sitting upright: the display screen sits on the platform. This method is the easiest to implement, and this type of installation should be preferred when conditions permit.
Mosaic: The display is embedded in a wall frame. This method is rare. If the wall is not deep enough, it must be considered for maintainability.
Side-mounted: that is, the sides of the display screen are stressed, and the side is hung between the two buildings or columns. This method is often used for the screen suspension of the open space, and the two columns are built according to the suspension requirements of the screen.
Third, the structural design
1, material selection
The angle steel is used as the main material of the screen frame to carry out anti-corrosion and fire-resistance treatment.
2, the box structure
The utility model adopts a large box structure, and the box material is polished, galvanized, sprayed, and has waterproof/corrosion resistance. The box has the characteristics of thin thickness, light weight and high strength, and adopts positioning column technology to ensure the installation accuracy.
3, the frame structure
Due to the standard box structure, the screen frame structure is simple, the positioning accuracy and the installation process of the screen body are easy to control, and the flatness of the whole screen is ensured.
4, the connection structure
The joint method of welding and connecting pieces is simple and easy, and the joint strength can be ensured, and the installation efficiency of the screen body can be improved.
Fourth, the system protection function design
1. Safety distribution system
a. Power-on system b. Anti-static design c. Lightning protection design
2, screen structure safety design
a. windproof design b. shockproof design c. waterproof design d. moisture / anti-condensation design e. dustproof design f. anti-oxidation / anti-corrosion design
3, temperature control system design
A. The heat dissipation system and high temperature protection design of the screen body
a. Excellent drive selection b. Perfect process design c. Complete system protection equipment d. Advanced system protection technology: “dynamic heat dissipation†technology, sealed convection heat dissipation, air conditioning cooling internal convection heat dissipation
B. The low temperature design of the screen body