Definition of 48V lithium ion battery
Usually, the single battery is generally around 3.7v, but in many cases the working voltage range is slightly larger, it is obvious that there is a problem of insufficient voltage. At this time, battery packs and modular batteries that can increase the battery voltage will follow, and among many high-voltage batteries, 48v lithium-ion batteries have been widely used. Compared with lead-acid batteries, 48V lithium-ion batteries have the advantages of small size, light weight, strong temperature adaptability, high charge and discharge efficiency, safety and stability, long service life, energy saving and environmental protection. 48V lithium ion batteries can be divided into ternary lithium batteries, lithium iron phosphate batteries, and lithium titanate batteries according to the positive electrode material.
48V lithium ion battery price
The 48V lithium-ion battery is composed of multiple lithium batteries in series and in parallel, because if a single battery cell is a 48v lithium battery, the efficiency and life of the battery are not very good. 48V lithium-ion battery price estimation formula: single lithium battery cell price x (3.6~3.7V*n=48v)*m (number of cells in parallel) + protection board price + housing price + auxiliary material price The voltage of a single lithium battery cell It is 3.6~3.7V, and its price will vary due to the different materials and processes used in the production of lithium battery manufacturers.
48V lithium ion battery pack model table
|Lithium Iron Phosphate
|Ternary lithium battery
48V Li-ion battery charger
Input voltage: 100-240V, 50-60Hz
Output voltage: 47.5V
Output current: 4A
Product application: 13 strings of 41V lithium iron phosphate battery pack
Product size: 178*80*46mm
Product weight: 0.8kg/pcs
Safety standard: UL1012 IEC60335 IEC61558
Certification: UL, cUL, GS, CE, ROHS, REACH, SAA, PSE, CCC
Product features: with reverse connection/overload/overcurrent/short circuit/high temperature automatic protection functions, parallel charging, automatic capture and tracking of battery voltage, lock charging current, temperature rise sensing, step-down stay, color-changing light-emitting diodes to display the full charge status
48V lithium ion battery protection board
The 48V lithium-ion battery protection board is a circuit board that plays a protective role. Mainly composed of electronic circuits, it can accurately monitor the voltage of the cell and the current of the charging and discharging circuit under the environment of -40℃ to +85℃, and control the on and off of the current circuit in time. The lithium battery protection board can play a role in the charge and discharge protection of the series and parallel battery packs, and can detect the overvoltage, overcurrent, overtemperature, undervoltage, and short circuit status of each single cell in the battery pack, prolonging the battery life and avoiding The battery is damaged by over-discharge. Lithium battery protection board is an indispensable part of lithium battery.
48V lithium ion battery BMS
The 48V lithium-ion battery management system (BMS) determines the status of the entire battery system by detecting the status of the individual cells in the lithium battery pack, and performs corresponding control adjustments and strategy implementations on the lithium battery system according to their status to achieve The lithium battery system and the charge and discharge management of each monomer ensure the safe and stable operation of the lithium battery system.
48V lithium ion battery BMS features
The lithium-ion battery management system consists of a management host (CPU), a voltage and temperature acquisition module, a current acquisition module, and a communication interface module.
It can detect and display the total voltage, total current, and reserve capacity of lithium-ion battery packs; the voltage of any single battery and the temperature of the battery box; the highest and lowest single battery voltage and battery number, the highest and lowest temperature, and the battery pack’s Charge and discharge capacity.
4 The lithium-ion battery host also provides an alarm and control output interface to alarm and control output for extreme conditions such as overvoltage, undervoltage, high temperature, low temperature, overcurrent, and short circuit.
Provide RS232 and CAN bus interface, can directly read all the information on the lithium battery management system on the computer.
Precautions for the use of 48V lithium ion battery
Lithium-ion batteries should be stored for a long time and should be kept at 50%-60% charged state, supplemented every 3 months, and charged and discharged every six months.
In the process of transportation, you should pay attention to moisture, moisture, and avoid squeezing, collision, etc., to avoid damage to the lithium ion battery.
It is forbidden to use or place the lithium-ion battery under high temperature (in the hot sun or in a very hot car), otherwise it may cause the battery to overheat, catch fire or function failure, and shorten the life.
It is forbidden to store in strong static electricity and strong magnetic field, otherwise it is easy to damage the battery safety protection device and bring hidden dangers of insecurity.
If the lithium-ion battery emits peculiar smell, heat, discoloration, deformation, or any abnormality during use, storage, or charging, immediately remove the battery from the device or charger and stop using it.
Comparison of 48V lithium ion battery and lead-acid battery
Weight energy density
At present, the energy density of lithium batteries is generally 200~260wh/g, lead acid is generally 50~70wh/g, and the weight energy density of lithium batteries is 3~5 times that of lead acid, which means that under the same weight, the capacity of lithium batteries is higher than that of lead. Acid batteries are three to five times stronger, so lithium batteries have an absolute advantage in energy storage.
Volume energy density
Since the volumetric energy density of lithium batteries is usually about 1.5 times that of lead-acid batteries, under the same capacity, lithium batteries are about 30% smaller than lead-acid batteries.
At present, the most popular lithium battery materials are ternary lithium and iron lithium. For example, a ternary lithium battery usually has 1000 cycles, a lithium iron phosphate battery has more than 2000 cycles, and a lead-acid battery usually has 300-350 cycles. Then it shows that the life of lithium batteries is about 3-6 times that of lead-acid batteries.
Lead-acid batteries are currently cheaper than lithium batteries, which are about three times more expensive than lead-acid batteries. However, through service life analysis, if the same cost is used, the life of lithium batteries is longer.
Lead-acid batteries are seriously polluted, and lithium batteries are relatively greener in terms of production and recycling.
48V lithium ion battery
1. Precautions for 48V Li-ion battery charging
Charge in strict accordance with standard time and procedures.
Lithium batteries are generally in a charged half-charged state when they leave the factory, and the battery must be fully charged for the first use.
Use the original charger, the original charger has strong supporting performance and moderate charging rate.
Don't often use it to charge when the undervoltage protection circuit works. The concept of completely discharging the electricity and then recharging is incorrect. The greater the depth of discharge, the more times the battery is used at loss of electricity, and the shorter the service life of the lithium battery.
2. How many kilometers can the 48V lithium-ion battery run with full power?
The battery life of the 48V lithium ion battery is related to the battery's own capacity (Ah) and the electric motor power (W) of the electric vehicle. The electric bicycles currently on the market that meet the national standards generally use a 48V 12Ah lithium battery and a 350W motor. The theoretical endurance of developing them can reach 50km, and the actual endurance is still determined by the weight of the occupant and the weight of the vehicle. How many kilometers the 48v lithium ion battery can run at full power depends on the battery capacity, motor power, and load capacity. Generally speaking, a 48V 12Ah, 350w lithium battery can run 50km. 48V 20Ah can run 70km. The 72V 22Ah lithium battery can run 90km.
3. How many hours does the 48v lithium battery need to be fully charged?
The charging time has nothing to do with the voltage; it mainly depends on the capacity of the lithium ion battery and the power of the charger, charging time = lithium battery capacity ÷ charging current. For example, if a 48V 20Ah lithium ion battery uses a regular 48V 2A charger, the theoretical charging time is 2 hours, that is, 20Ah÷10A=2h, but in actual charging, the constant current to constant voltage mode will take a long time in the final trickle charge, so it is about 3 hours under normal circumstances. In the same way, if you choose a 48V 5A charger, you need 20Ah÷5A=4h, but there is also a trickle time, so it's about 5 hours.
4. What should I do if the 48V Li-ion battery cannot be charged?
Whether the output parameters of the charger are normal, voltage, current, etc.;
Whether the charger circuit is normal and whether the connector is disconnected;
Whether the lithium battery is broken, you can test whether the open circuit voltage of the battery is normal;
Consult the lithium battery manufacturer.
5. The difference between 48V13 string and 14 string
Three yuan is divided into 13 or 14 strings, lithium iron phosphate is 16 strings
But the ternary 13 series discharge platform is obviously lower than 48V, the speed is slow, and the 14 series is better.
13 strings full voltage 13*4.2=54.6V, rated voltage 13*3.7=48.1V, cut-off voltage 13*3.2 = 41.6V
14 strings full voltage 14*4.2=58.8V, rated voltage 14*3.7=51.8V, cut-off voltage 14*3.2 = 44.8V
13 strings can be better compatible with electric vehicles with lead-acid batteries. The normal electric vehicle with lead-acid batteries is 12*4=48V, and the cut-off voltage is 10.5*4=42V.
In addition, the charger voltage of the 48V 13 string and the 48V 14 string is different and cannot be used universally. Some chargers can be used by adjusting the voltage.
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