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Lithium Battery Buck-boost Methods

Mar 02 , 2022

Ⅰ. Lithium battery voltage rise and fall test


1. First, reduce the lithium battery to 3.3V through the step-down chip, and then power the microcontroller and Bluetooth module. The other plan is to raise the battery to 7V to carry a load.


2. Results: The lithium battery Bluetooth module does not work and cannot be searched. Without Bluetooth, the microcontroller and the load work normally. Without the microcontroller, the Bluetooth and load work normally. Without the use of step-down voltage, all three work normally with a separate power supply.


3. Statement: xc6206 is for fall while fd6291 is for rise.


Ⅱ. Lithium battery voltage rise and fall problems


Let's analyze and know the causes of the above problems and find the common issues of lithium batteries lifting pressure.


1. The single voltage of li ion battery has a certain range, such as the normal working voltage range of lithium iron phosphate battery is 2.5V-3.65V, and it is 3V-4.2V for lithium manganate and ternary batteries.


2. In the application of the li ion battery, when the total voltage is 60V or below, the battery protection is needed; When above 60V, a battery management system (BMS) is required. These two devices play a protection role in keeping the battery working properly.


3. Attention: After the number of battery pack is fixed, do not adjust the battery pack voltage at will, that is, the voltage of the battery pack can only change within the normal working voltage range: When charging, the voltage rises from the lower limit to the upper limit; When using electricity, it should drop from upper voltage to lower voltage.


4. After understanding that problem, you can adjust it at will if you want to extend the lithium battery voltage range.


Ⅲ. The solution of lithium battery voltage rise and fall problems


1. A battery pack with a suitable inverter and a DC voltage regulator can meet the requirements of lithium battery voltage rise and fall.


2. Statement: This method is rarely used in practical applications, except when the AC power supply in use is frequently out of power, or when solar or wind power is used to charge the battery pack. The methods of lithium battery voltage rise and fall can be used in the experiment, with good study effect.


The above is the specific introduction of lithium battery buck-boost methods. For more information about lithium batteries, please continue to pay attention to our website and we will give you the most professional and detailed introduction. If you need our related products, welcome to consult us. We are looking forward to communicating with you!