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　　Purpose: to complete the communication static power supply for remote power supply of various small power communication terminal equipment. Its primary load includes microcellular, WLAN equipment, optical fiber communication network equipment, indoor distribution system, outdoor marginal station, radio frequency pull away, etc.

　　1. Primary technical and functional indexes of lithium iron phosphate battery pack:

　　Operating temperature: - 20 ℃ ~ + 60 ℃ (Note: within the operating temperature scale, the appearance of the battery shall be free of deformation, bursting, etc.)

　　Charging ambient temperature: 0 ℃ ~ 55 ℃;

　　Discharge ambient temperature: - 20 ℃ ~ 60 ℃.

　　Storage temperature scale: - 25 ℃ ~ + 60 ℃

　　Relative humidity: ≤ 85%

　　Atmospheric pressure: 70kpa ~ 106kpa

　　Operating voltage: - 48V ~ - 56V

　　Audio noise: < 55dB (1 meter in front of the equipment)

　　The average charging voltage scale is (3.55 ~ 3.60) V, and the floating charging voltage scale is (3.35 ~ 3.40) v

　　Warranty period: 5 years, cycle life shall not be less than 2000 times, and floating life on the network shall not be less than 10 years.

　　The battery capacity is 50ah, each group of 48V must be composed of 15 or 16 single batteries, with BMS function of battery management system.

　　Battery self maintenance: with battery active equalization function; the product shall have monitoring function, with RS232 or RS485 interface, which can be connected to the buyer's power environment monitoring system.

　　Charge and discharge active handling: the monitoring unit actively measures the charge and discharge current of the battery and conducts floating charge and equalizing charge handling for the battery;

　　2. Battery pack functional consistency:

　　a) The difference between the maximum and minimum static open circuit voltage of each fully charged battery in the battery pack shall not be greater than 0.05v;

　　b) The terminal voltage difference between batteries shall not be greater than 0.20v 24 hours after the battery enters the floating charge condition;

　　c) When the battery is discharged, the terminal voltage difference between the batteries shall not be greater than 0.25V;

　　d) The difference between the maximum, minimum and average capacity of each battery in the battery pack shall not exceed 1% of the average value of the taxi.

　　3. Safety function requirements of lithium iron phosphate battery:

　　Safety features of overcharge: after the battery is charged, it shall be kept for 1H under the condition of (25 ± 5) ℃. At (25 ± 5) ℃

　　Charge to 5V at 5000mA cell current.

　　Functional requirements: no blasting, no fire.

　　High temperature safety characteristics: place the battery in a constant temperature box (130 ± 2) ℃ and keep it for 30min.

　　Functional requirements: no blasting, no fire

　　Safety feature of falling: after charging the battery, put it aside for 1H at (25 ± 5) ℃, and then fall to the board from 4m high at (25 ± 5) ℃.

　　Functional requirements: no blasting, no fire.

　　External short circuit: when the battery is short circuited, it shall not burst or burn.

　　External influence: under the circumstances of acupuncture, extrusion, impact, falling, etc., the battery shall not explode or burn.

　　4. BMS maintenance function

　　(1) Overcharge maintenance

　　The battery pack has the function of overcharge maintenance. When the overcharge condition is detected, the battery pack maintenance system shall block the charging circuit. The battery pack shall be free from leakage, smoke, fire or explosion. After the voltage and current are revoked, the battery pack can operate normally.

　　(2) Over discharge maintenance

　　When the voltage of any cell of the battery pack is less than the over discharge maintenance voltage (2.5V, which can be adjusted according to the value given by the manufacturer), the battery pack maintenance system can block the discharge circuit. After the city electricity recovers, the battery group should take the initiative to recover the charging condition and work normally.

　　(3) Short circuit maintenance

　　When the battery pack is fully charged, the battery pack shall be able to block the circuit when the positive and negative poles of the battery pack are short circuited, and the battery pack shall be free from leakage, smoke, fire or explosion. After the short circuit is revoked, the battery pack can operate normally.

　　(3) Reverse connection maintenance

　　The positive and negative terminals and polarity of the battery shall be marked obviously, and the plug-in mechanism shall be selected to prevent reverse connection planning; when the battery pack is fully charged, the battery pack maintenance system can block the circuit when the positive and negative poles are reversed, and the battery pack shall be free from leakage, smoke, fire or explosion. After the reverse voltage is revoked, the battery pack can operate normally.

　　(4) Overload maintenance

　　After the battery pack is fully charged according to the rules, when the discharge current reaches the overload maintenance current value, the battery pack maintenance system shall be able to block the circuit, and the battery pack shall be free from leakage, smoke, fire or explosion. After the overload is revoked, the battery pack can operate normally.

　　(5) Temperature maintenance

　　When the temperature reaches the scale of the maintenance point (it is required to be higher than 60 degrees, the bidder shall provide specific data), the battery pack shall block the circuit (the BMS components inside the battery pack are maintained outside at high temperature), and when the temperature reaches the scale of the rehabilitation point, the battery pack shall actively recover; the battery pack shall not leak liquid, smoke, fire or explosion in the whole process.

　　Environmental reliability

　　The product shall have outstanding temperature adaptability, and the function of the product shall not be affected when the temperature and humidity change greatly. The product shall provide detailed explanation.

　　5. Other requirements for lithium iron phosphate battery

　　(1) The battery surface shall be clean, free of rust, scratch, deformation, mechanical damage, liquid leakage, and the interface contact shall be free of rust;

　　(2) The battery surface shall be provided with necessary product identification, indicating the production date, product identification, clear printing, clear identification and not easy to fall;

　　(3) The positive and negative terminals and polarity of the battery shall be marked obviously, with glossy appearance, free of flash, burr and uneven defects. The surface shall be polished and passivated for easy connection. The terminal size shall conform to the manufacturer's product drawing;

　　(4) The communication interface and power interface of the battery shall have clear Chinese identification and conform to the manufacturer's product drawing;

　　(5) The external dimensions of the battery shall conform to the manufacturer's product drawings or document rules;

　　(6) Advanced connection and fastening methods shall be selected to ensure the reliability of connection between single batteries inside the battery pack.

　　(7) For parallel battery, the connecting cable between batteries shall be copper cable, and the cable diameter shall meet the requirements of safe carrying capacity.

　　Zhongshan lithium battery manufacturer http://www.ydaifa.com/