The 48V lithium iron phosphate battery pack is used for communication, backup power supply, etc. The lithium battery pack has a variety of product models, and the battery capacity, dimensions, and current protection circuit functions can be flexibly designed. It can provide customers with customized solutions for lithium batteries.Please contact us for customization of lithium iron phosphate battery pack.
UPS Backup Power Lithium battery pack provides uninterrupted power to the equipment. Lithium battery packs have the characteristics of high working voltage, large capacity, long cycle life, no pollution, high current charge and discharge, and stable battery performance, which can meet the needs of various application scenarios.
48V LiFePO4 battery pack for communication, backup power, etc. There are various product models of lithium battery packs, and the battery capacity, size, and current protection circuit functions can be flexibly designed and can provide customers with customized solutions for lithium batteries.
48V lithium iron phosphate battery pack applicable scope
◆Small computer room
◆Weak current room and other room subsystems
◆New energy outdoor venues
◆Communication base station
◆Indoor and outdoor non-air-conditioned places
48V lithium iron phosphate battery pack performance characteristics
❖Service life: The cycle life of lead-acid batteries is 300~500 times, while the cycle life of lithium battery packs can reach more than 2000 times, and the service life can reach more than 6 years.
❖Environmental protection: UPS lithium battery pack does not contain any heavy metals and rare metals, which will not cause pollution and stress to the environment. Lead-acid batteries contain a lot of lead and acid, and improper recycling after use will cause pollution.
❖Safety: The P-O bond in the lithium iron phosphate battery pack crystal is stable and not easy to decompose. Lithium iron phosphate batteries have passed strict safety tests and will not explode even in severe collisions.
❖No memory effect: No matter what state the lithium iron phosphate battery is in, it can be charged and used at any time, and there is no need to discharge before charging
❖Good high-temperature performance: 48V lithium iron phosphate has a wide operating temperature range (-20°C--+80°C), good high-temperature performance: when the external temperature is 65°C, the internal temperature is as high as 95°C when the battery discharge ends temperature up to 160°C. Battery layout is safe and intact; LiFePO4 electric heating peaks up to 350°C-500°C
❖High-efficiency output: continuous high current discharge up to 10C, instantaneous pulse discharge (10S) up to 20C
❖Quick charging: High current 2C can be quickly charged and discharged, the battery can be fully charged within 40 minutes under 1.5C charging, and there is a special charger, the starting current can reach 2C
❖High energy: UPS lithium battery pack has a high storage energy density, which has reached 460-600Wh/kg, which is about 6-7 times that of lead-acid batteries
❖Lightweight: The volume of the lithium iron phosphate battery with the same specifications and capacity is 3/5 of the volume of the lead-acid battery, and the weight is 4/7 of the volume of the lead-acid battery
❖High rated voltage: approximately equal to the series voltage of 3 NiCd or NiMH rechargeable batteries, easy to form a battery power pack.
1. What materials are needed to assemble a lithium iron phosphate 48V battery pack
1.1. Before assembling the 48V lithium battery pack, it is necessary to calculate the product size and the required load capacity, and then calculate the capacity of the assembled lithium battery pack according to the required capacity of the product, and then select the lithium battery cells according to the calculation results.
1.2. The container for fixing the lithium battery also needs to be prepared to prevent the lithium battery pack from changing during the moving process after being placed. The materials separating the lithium batteries are connected in series, and the fixing effect is better when every two lithium batteries are connected together, such as auxiliary materials such as silicone rubber.
1.3. First, arrange the lithium batteries neatly, and then fix each string of lithium batteries with materials. After each string of lithium batteries is installed, it is best to separate each string of lithium batteries with insulating materials such as highland barley paper because the damage to the outer skin of the lithium battery will cause subsequent short circuits. Management of many cells should also be equipped with a charge and discharge protection board.
1.4. After finishing and fixing, the main series of steps can be completed with nickel tape. When the series connection of the lithium battery packs is completed, the next step ends. Bind the battery pack with tape, and seal the positive and negative electrodes with highland barley paper to avoid short circuits caused by subsequent misoperation. Therefore, it is essential to prepare fiber tape, epoxy paper, and highland barley paper.
1.5. After the battery is connected in series and parallel, connect to the protection board, activate the protection board, wrap it with a layer of thermoplastic film, make it waterproof, and then put it into an aluminum alloy or plastic packaging box. At the same time, an aging test is also required, and the factory can only be shipped after passing the test.
2. Simple tutorial of lithium iron phosphate 48V battery module
2.1. Select a suitable battery and match the battery type, voltage, and internal resistance. Balance the batteries before assembling. Cut electrodes and punch holes.
2.2. According to the aperture size, calculate the distance and cut the insulating plate.
2.3. Screw on the nut, please use a hexagonal nut with a flange to prevent the nut from falling off, and screw on and fix the lithium battery.
2.4. When connecting the welding line and the voltage collection line (balance line), the protection board should not be connected externally, so as to avoid accidental burning of the protection board.
2.5. The insulating silica gel is fixed again, and it will solidify after a long time.
2.6. If you forget to balance the battery cells before removing the protection board, this is the last chance before assembling the lithium battery, which can be balanced by the balance line.
2.7. Fix the whole battery pack together with a heat shield and wrap it with nylon tape, which is more durable.
2.8. When packaging the battery cells as a whole, please fix the battery cells and the protective plate together. Our cells still work fine when measured up to 1 meter high.
2.9. Fix the whole lithium battery with an insulating plate and wrap it with nylon tape, which is more durable.
2.10. When packaging the battery cells as a whole, please fix the battery cells and the protective plate together. Our cells still work fine when measured up to 1 meter high.
3. How many cells are needed to assemble an iron phosphate 48V lithium battery
The question of how many cells are needed, it depends on the capacity of a single cell. The standard of 48v iron-lithium battery is 16 series (there are also many 15 series, which can be close to the voltage of 13 series ternary lithium battery, full voltage: 15 series iron lithium voltage 54.75v, 16 series 58.4v, 13 series ternary 54.6v, 14 strings of ternary 58.8v, four lead-acid batteries 58v) if the iron-lithium single section 20ah is the simplest, it is 15 or 16 iron-lithium.
If the iron-lithium single cell is 10ah, the number has to be doubled. If it is the kind of 32650 iron lithium 5.5ah, it needs four times the number (four parallel 16 strings).
These voltage values are very useful because they are close, and the chargers can be used universally. For example, 15 series of iron-lithium can use 13 series of ternary chargers, but not the other way around. The 16-series iron-lithium charger can charge the 14-series ternary, but not the other way around. The standard 48v lead-acid charger can charge 16 strings of iron-lithium/14 strings of ternary lithium batteries (the red light is only when the lithium battery is lower than 55v, and the green light will be green when the lithium battery protection board is full of standard voltage. If it is higher than 55v, it is a small current Greenlight. Therefore, the number of cells needs to be planned and calculated according to specific capacity, application scenarios, packaging, and other specifications.
4. What kind of charger should a 48v lithium iron phosphate battery be equipped with?
The charging current is generally about one-tenth of the rated ampere-hour under normal charging conditions. Therefore, for 10AH lithium batteries, it is more appropriate to control the charging current at 0.6 to 1 ampere. The charging current of the lithium battery is suitable for a 0.2C~0.5C rate, and the charging time is suitable for 3 hours~6 hours. Therefore, a 6Ah battery charging current of 1.2A~3A is suitable. The general charger is 1A, and it takes about 7 hours to charge 6Ah. The charging voltage of the charger can be 48-50V. The charging current is related to the total capacity of the battery pack. Generally, 0.3C current is recommended for charging, which has a protective effect on the battery pack. C is the total capacity of the battery pack, eg 10000mA. Therefore, it is necessary to equip a suitable charger according to different battery conditions.
5. What is the cut-off voltage of the 48v lithium iron phosphate battery protection board?
The upper limit of the charging cut-off voltage of a single string of lithium iron phosphate cells is 3.65V, and the charging cut-off current is 0.02C.
The voltage platform is close to 3.2V, 48/3.2=15 strings*3.65=54.75V. In order to ensure the service life of the battery, it is recommended that the charge cut-off voltage be 54V. The discharge cut-off voltage of a single string is 2.5V, so the discharge cut-off voltage of the 48V module is 15 strings*2.5V=37.5V, which is a conservative 38V. Because it is a module, considering the voltage imbalance of a single string, it is necessary to add a single string voltage detection. When one of the strings is lower than 2.3V, it is recommended to cut off the output.
6.Example of termination voltage
Taking a 12V lead-acid battery as an example, according to the national technical standard, the terminal voltage of each cell of the battery is 1.75V, so the terminal voltage of the 12V series battery is 10.50V, which means that when the discharge voltage of the battery reaches 10.50V, it must be terminated. Continue the discharge operation. Similarly, the termination voltage of 16V series batteries is 14V.
A continued discharge will cause the battery to over-discharge. Therefore, our electric vehicle controller also has an under voltage protection circuit. It is to protect the battery and prevent over-discharge. For example, for a 48V electric vehicle, its Undervoltage protection value is 42V, and the Undervoltage protection value for a 60V electric vehicle is 52.5V. That is, the number of battery blocks multiplied by 10.5 is the Undervoltage protection value of the car.
Lithium battery assembly is a simple and professional thing. Safety is very important. We specialize in lithium battery pack. If you need customization, you can contact us.