What is a 12V lithium battery?
The 12v lithium battery is a lithium battery pack composed of 3 or 4 lithium batteries connected in series. The capacity of the battery is determined by the capacity of the single cell and the number of cells connected in parallel. It is a new type of safety and environmental protection. rechargeable battery.
12V lithium battery classification
According to different materials and packaging, 12V lithium batteries are divided into 12V lithium ion batteries, 12V lithium iron phosphate batteries, 12V cylindrical lithium batteries, and 12V polymer lithium batteries.
1. 12v lithium ion battery
The 12V lithium ion battery is connected in series with 3 or 4 lithium batteries. The combined battery pack, the capacity of the battery is determined according to the capacity of a single cell or the capacity of the batteries connected in parallel, which is a new type of safe and environmentally friendly battery.
battery capacity
There is no standard capacity for capacity. It is determined according to the specific requirements of electrical appliances or equipment. The general capacity is: 2200mah, 5AH, 10Ah, and some electric vehicles can have a capacity of up to 20AH or 50AH. The more batteries are connected in parallel, the greater the capacity.
volume
The volume of a 12V lithium battery should be determined according to the capacity of the battery, and there is no uniform specification. The larger the battery capacity, the larger the volume.
weight
Nowadays, many devices require large-capacity and lighter lithium batteries. For example, electric vehicles used lead-acid batteries in the past. Now many electric vehicles have become lithium batteries because lithium batteries have large capacity, light weight, and small size.
Charge and discharge current
The charge and discharge current of a lithium battery is determined according to the power of the device. On the basis of constant voltage, the greater the power of the device, the greater the current that needs to be output.
2. 12V lithium iron phosphate battery
The 12V lithium iron phosphate battery is a battery pack composed of four lithium iron phosphate batteries connected in series. Lithium iron phosphate batteries are lithium batteries that use lithium iron phosphate (LiFePO4) as the cathode material. The nominal voltage is 3.2V, the maximum charging voltage of a single cell is less than 3.9V, and the minimum discharge voltage is greater than 2.0V. Advantages of 12V lithium iron phosphate battery
The 12V lithium iron phosphate battery has a long life. Under the same conditions, lithium iron phosphate batteries can be used for 7 to 8 years.
Safe to use. The 12V lithium iron phosphate battery has undergone strict safety tests and will not explode even in a traffic accident.
Charging is fast. Using a dedicated charger, the battery can be fully charged after 40 minutes of charging at 1.5C.
The 12V lithium iron phosphate battery is resistant to high temperatures, and the hot air value of the 12V lithium iron phosphate battery can reach 350 to 500 ℃.
The 12V lithium iron phosphate battery is environmentally friendly, non-toxic, non-polluting, has a wide range of raw materials, and is cheap.
3. 12V polymer lithium battery
Polymer lithium battery is developed on the basis of liquid lithium ion battery. Its positive and negative electrode materials are the same as liquid lithium ion battery, but it uses gel electrolyte and aluminum plastic film as outer packaging. Polymer lithium battery also Called lithium polymer battery, also known as polymer lithium battery. The 12V polymer lithium battery has a nominal voltage of 12V and is widely used in digital products, power tools, special wearable devices and other fields. Advantages of 12V polymer lithium battery
Higher energy density
Better security
Flexible design, shape can be customized
Good discharge characteristics
Simple protection board design
12V lithium battery price
Battery cell
Lithium batteries will have lithium manganese oxide (3.6V), lithium cobalt oxide (3.7V/3.8V), lithium nickel cobalt manganese oxide (3.6V), lithium iron phosphate (3.2V), and lithium titanate depending on the cathode material. (2.3V/2.4V) and other battery cells with different material systems, the voltage platform, safety factor, number of cycles, energy density ratio, working temperature, etc. are different, so the price will also be different.
brand
Different lithium battery brands have obvious price differences, mainly because the quality (safety, consistency, stability, production process, etc.) of the batteries of each brand is basically proportional to the price.
capacity
When the voltage of a 12V lithium battery is determined, the larger the capacity, the higher the cost and the higher the price.
Protection board quality and circuit design
High-quality lithium batteries use high-quality electronic components and protection boards, as well as multiple protection circuit designs, which not only perfect the charge and discharge circuit, but also have multiple designs such as constant temperature and constant voltage, overcharge, overdischarge, overcurrent, and short circuit. You and your device create a safe use environment, so the price will be affected by these two factors
1. 12V lithium battery charging
Charging method
The charger used for 12v lithium battery charging should meet the three-stage characteristics of lithium battery charging, and it needs to have and complete the three stages of pre-charging, constant current charging and constant voltage charging. For this reason, the original 12v lithium battery charger is good, when the original charger is damaged, do not blindly buy other chargers to charge the 12v lithium battery.
Ambient temperature
When charging a 12v lithium battery, the ambient temperature should not exceed the range of 0-40°C.
Charging cut-off voltage
The charging cut-off voltage of the 12v polymer lithium battery is 12.6v, and a balanced charging method is required to ensure that the voltage of a single cell does not exceed 4.2V.
recharging current
If it is used for non-emergency use, it can be charged at 0.2C, and generally cannot be charged at more than 1C.
2. 12V lithium battery discharge
Ambient temperature
Discharge is the working state of 12v lithium battery, and the temperature requirement at this time is -20~60℃.
End of discharge voltage
The discharge termination voltage standard of polymer 12v lithium battery is 8.25V, and some can be set to 9V.
Discharge current
The 12v polymer lithium battery pack also has types such as large current and large capacity. The current of the polymer lithium battery that can be discharged with high power should be controlled within the range of the product specification.
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