48V Lithium Battery Packs for Smart Home, Garden Tools

48V lithium-ion battery definition
The single battery on the market is generally around 3.7v, but many times a slightly larger operating voltage range is clearly a problem of insufficient voltage. This time to increase the voltage of the battery pack and modular battery comes along, and among the many high voltage batteries, 48v lithium-ion batteries are commonly used.

Compared with lead-acid batteries, 48V lithium-ion batteries have the advantages of small size, light weight, strong temperature adaptability, high charging and discharging 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, lithium titanate batteries according to the cathode material.

48V lithium-ion battery price
48V lithium-ion battery is made by combining multiple lithium cells by connecting them in series and parallel, because if the manufacture of a single cell is a 48v lithium battery, the efficiency and life of the battery is not very good.

48V lithium-ion battery price estimation formula
Single lithium battery cell price x (3.6~3.7Vn=48v)m (number of cells in parallel) + protection plate price + shell price + auxiliary material price
The general voltage of a single lithium cell is 3.6~3.7V, and its price will vary because of the different materials and processes used by lithium battery manufacturers.

48V lithium-ion battery protection circuit board
48V lithium-ion battery protection board, i.e. the circuit board that plays a protective role. It is mainly composed of electronic circuits, which can accurately monitor the voltage of the battery cell and the current of the charging and discharging circuit at all times under the environment of -40℃ to +85℃, and control the on/off of the current circuit in time.

Li-ion battery protection board can play the role of charging and discharging protection for series and parallel connected battery pack, and at the same time can detect the over-voltage, over-current, over-temperature, under-voltage and short-circuit status of each single battery in the battery pack to prolong the service life of the battery and avoid the damage of the battery due to over-discharge. Lithium battery protection board is an indispensable component of lithium battery.

48V Li-ion Battery BMS
The 48V Li-ion battery management system (BMS) determines the status of the entire battery system by detecting the status of each individual cell in the Li-ion battery pack, and implements corresponding control adjustments and strategies for the Li-ion battery system based on their status to achieve charge and discharge management of the Li-ion battery system and each individual cell to ensure safe and stable operation of the Li-ion battery system.

48V Li-ion Battery BMS Features
The lithium-ion battery management system consists of a management host (CPU), voltage and temperature acquisition module, current acquisition module and communication interface module.

It can detect and display the total voltage, total current and reserve power of the lithium-ion battery pack; the voltage of any single cell and the temperature of the battery box; the highest and lowest single cell voltage and cell number, the highest and lowest temperature, and the charge and discharge amount of the battery pack.

4 Lithium-ion battery host also provides alarm and control output interface for over-voltage, under-voltage, high temperature, low temperature, over-current, short circuit and other limit conditions.

RS232 and CAN bus interfaces are provided to read all the information on the lithium battery management system directly on the computer.

48V lithium-ion battery use precautions
Lithium-ion battery stored for a long time without use, should maintain 50%-60% charge state, every 3 months should be replenished once, every six months should be charged and discharged once.

During transportation, care should be taken to prevent moisture and humidity, and avoid extrusion and collision to avoid damage to the lithium-ion battery.

It is prohibited to use or place the lithium-ion battery under high temperature (hot sunlight or very hot car), otherwise it may cause battery overheating, fire or function failure and shortened life.

Prohibit storage in places with strong static electricity and strong magnetic field, otherwise it will easily destroy the battery safety protection device and bring unsafe hidden danger.

If the lithium-ion battery emits an odor, heat, discoloration, deformation or any abnormalities occur during use, storage or charging, immediately remove the battery from the device or charger and discontinue use.

48V lithium-ion battery vs. lead-acid battery
Weight Energy Density
At present, the energy density of lithium battery is generally 200~260wh/g, while that of lead-acid is generally 50~70wh/g. The weight energy density of lithium battery is 3~5 times that of lead-acid, which means that the capacity of lithium battery is three to five times stronger than that of lead-acid battery under the same weight, so lithium battery has absolute advantage in energy storage.

Volume energy density
Since the volume energy density of Li-ion battery is usually about 1.5 times that of lead-acid battery, Li-ion battery is about 30% smaller than lead-acid battery in the case of the same capacity.

Service life
The most popular lithium battery materials are lithium ternary and lithium iron. For example, ternary lithium batteries usually have 1000 cycles, lithium iron phosphate batteries have more than 2000 cycles, and lead-acid batteries usually have 300-350 cycles. Then it means that the life of lithium batteries is about 3-6 times that of lead-acid batteries.

Price Cost
Lead-acid batteries are currently cheaper than lithium batteries, which are about three times more expensive than lead-acid batteries. However, by lifetime analysis, lithium batteries last longer if the same cost is used.

Environmental Protection
Lead-acid batteries are heavily polluted, while lithium batteries are relatively greener in terms of production and recycling.

1、Cautions for charging 48V Li-ion battery
Strictly follow the standard time and procedure for charging.
The lithium battery is generally charged when it leaves the factory in a semi-charged state, the battery must be fully charged for the first time.
Use the original charger, the original charger supporting strong performance, charging multiplier moderate.
Do not often use until the undervoltage protection circuit comes into play before charging. The concept of charging after the electricity is completely discharged is incorrect, the greater the depth of discharge, the more times the use of power loss, the shorter the service life of lithium batteries.

2、How many kilometers can a 48V lithium-ion battery run when fully charged?
The range of 48V lithium-ion battery is related to the capacity of the battery itself (Ah) and the motor power (W) of the electric vehicle. The electric bicycles on the market now generally use 48V 12Ah lithium batteries and 350W motors to meet national standards, and with the development of battery technology, their theoretical range can reach 50km, and the actual range is still determined by the weight of the rider and the weight carried.

48v lithium-ion battery full power how many kilometers depends on factors such as battery capacity, motor power, load weight. Generally speaking 48V 12Ah , 350w lithium battery can run 50km. 48V 20Ah can run 70km. 72V 22Ah lithium battery can run 90km.

3、48v lithium battery to charge how many hours to full?
Charging time and voltage do not have much to do with.
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, 48V 20Ah lithium-ion battery with a regular 48V 2A charger, then the theoretical charging time of 2 hours, that is, 20Ah ÷ 10A = 2h, but the actual charging constant current to constant voltage mode, the trickle charge at the end takes longer, so under normal circumstances are in about 3 hours. Similarly, the choice of 48V 5A charger, it takes 20Ah ÷ 5A = 4h, but the same trickle time, so about 5 hours or so.

4, 48V lithium-ion battery can not be charged into how to do?
Whether the output parameters of the charger are normal, voltage, current, etc.
whether the charger line is normal, whether the connector is disconnected
whether the lithium battery is bad, you can test whether the open circuit voltage of the battery is normal.
Consult the lithium battery manufacturer.