What are the basic technical indicators for lithium iron phosphate battery packs?

1. Important technical performance indicators for lithium iron phosphate battery packs: Working temperature: -20℃~+60℃ (Note: within the working temperature range, the appearance of the battery should not be deformed or bursting) Charging environment temperature: 0℃~55℃ ; Discharge environment temperature: -20℃~60℃. Storage temperature range: -25℃~+60℃ Relative humidity: ≤85% Atmospheric pressure: 70KPa~106Kpa Working voltage: -48V~-56V Audio noise: u003c55dB (1 meter from the front of the device) The charging voltage range is ( 3.55~3.60)V, the floating charging voltage range is (3.35~3.40)V Warranty period: 5 years, the cycle life should not be less than 2000 times, and the floating charge service life on the network should not be less than 10 years. The battery capacity is 50AH, and each group of 48V must be packed with 15 or 16 single cells, and it has the function of battery management system BMS. Battery self-maintenance: It has the function of automatic battery balancing; the product should have the monitoring function, with RS232 or RS485 interface, which can be connected to the buyer's power environment monitoring system. Automatic charge and discharge management: the monitoring unit automatically measures the charge and discharge current of the battery and manages the floating charge and equalization of the battery; 2. Battery pack performance consistency: a) The maximum static open circuit voltage between each fully charged battery in the battery pack The difference from the minimum value should not be greater than 0.05V; b) The terminal voltage difference between the batteries after the battery pack enters the floating state for 24 hours should not be greater than 0.20V; c) The terminal voltage between the batteries when the battery pack is discharged The difference should not be greater than 0.25V; d) The difference between the maximum and minimum capacity of each battery in the battery pack and the average value should not exceed ± 1% of the average value. 3. Safety performance requirements of lithium iron phosphate battery: Overcharge safety characteristics: After the battery is charged, it should be stored at (25±5)℃ for 1h. Under the condition of (25±5)℃, it is charged to 5V with 5000mA single battery current. Performance requirements: no explosion, no fire. High temperature safety feature: Put the battery in a constant temperature box (130±2)℃ and keep it warm for 30min. Performance requirements: no explosion, no fire. Falling safety characteristics: After the battery is charged, it will be stored at (25±5)℃ for 1h, and at (25±5)℃, it will fall from a height of 4 meters onto a wooden board. Performance requirements: no explosion, no fire. External short circuit: The battery should not explode or burn when it is short circuited. External influence: The battery should not explode or burn under the conditions of acupuncture, squeezing, impact pressure, falling, etc. 4. BMS protection function (1) Overcharge protection The battery pack has an overcharge protection function. When the overcharge state is tested, the battery pack protection system should cut off the charging circuit. The battery pack should not leak, smoke, catch fire or explode, and the voltage After the current is removed, the battery pack can work normally. (2) When the voltage of any cell of the over-discharge protection battery pack is less than the over-discharge protection voltage (2.5V, which can be adjusted according to the value set by the manufacturer), the battery pack protection system can cut off the discharge circuit. After the utility power is restored, the battery pack should automatically restore the charging state and work normally. (3) Short circuit protection When the battery pack is fully charged, the battery pack should be able to cut off the circuit when the positive and negative poles of the battery pack are short-circuited. The battery pack should not leak, smoke, catch fire or explode, and the battery pack can work normally after the short circuit is removed. (3) The positive and negative terminals and polarity of the reverse connection protection battery should be clearly marked, and a plug-in mechanism is required to prevent reverse connection; when the battery pack is fully charged, the battery pack protection system when the positive and negative electrodes are reversely connected The circuit can be cut off, and the battery pack should not leak, smoke, catch fire or explode. After the reverse voltage is removed, the battery pack can work normally. (4) After the overload protection battery pack is charged according to regulations, when the discharge current reaches the overload protection current value, the battery pack protection system should be able to cut off the circuit, and the battery pack should not leak, smoke, catch fire or explode. After the overload is removed , The battery pack can work normally. (5) When the temperature protection temperature reaches the protection point range (required to be higher than 60 degrees, the bidder shall provide detailed data), the battery pack should cut off the circuit (except for the high temperature protection of the BMS components inside the battery pack), and when the temperature reaches the recovery point range , The battery pack should automatically resume work; the battery pack should not leak, smoke, catch fire or explode during the whole process. Environmental reliability products should have good temperature adaptability. When the temperature and humidity change greatly, the performance of the product should not be affected. The product should be supplied with specific instructions. 5. Other requirements for lithium iron phosphate batteries (1) The surface of the battery should be clean, free of rust, scratches, deformation and mechanical damage, no leakage, and no rust on the interface contacts; (2) There should be products on the surface of the battery. Label, and indicate the processing date, the product label, the printing is clear, and the label is clear, not easy to fall off; (3) The positive and negative terminals and polarity of the battery should be clearly marked, and the surface should be glossy, free of burrs, unevenness, and unevenness. The surface is polished and passivated, and it is easy to connect. The size of the terminal should conform to the manufacturer’s product drawing; (4) The communication interface and power interface of the battery should be clearly marked in Chinese and conform to the manufacturer’s product drawing; (5) The external dimensions of the battery should be Comply with the manufacturer's product drawings or document regulations; (6) Advanced connection and fastening methods should be adopted to ensure the reliability of the connection between the single cells in the battery pack. (7) If the battery packs are connected in parallel, the connecting cables between the batteries should be copper cables, and the cable diameter should meet the requirements of safe current carrying capacity. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis on global certification of lithium battery products