How to use the lithium iron phosphate battery pack and the battery pack in series and parallel

How to use the lithium iron phosphate battery pack and the battery pack in series and parallel? String and parallel connection are two combinations of lithium battery packs. The lithium iron phosphate battery pack in parallel and series is not just a simple line string and connection, but also to get a safe and stable series and parallel connection successfully.

Implaning of series and parallel lithium iron phosphate battery:

Series mode means that the anode of the first section is connected to the second lithium positive electrode, the anode of the second section is connected to the positive electrode of the third section, and so on, until the required voltage is reached, the connection voltage is the sum of the cell voltage connected together, and the capacity is the capacity of a single section, and then protected in the output. For example, a 12V battery needs three strings (take ternary materials, for example), and a 24V battery needs seven strings.

Parallel mode means that the positive electrode of the first lithium battery is connected to the positive electrode of the second section, and the negative electrode is connected to the negative electrode, and so on, achieving the required capacity. The voltage in this comprehensive mode is still a single voltage, and the capacity is the total of the battery capacity.

Lithium battery pack combination needs these two combinations to achieve the required voltage and capacity, and the batteries are generally connected by the nickel sheet, which requires special equipment to weld the nickel sheet with the cell, and this way is relatively firm and safe. Then in the corresponding protection before the output.

How to use the lithium iron phosphate battery pack and the battery pack in series and parallel?

The characteristics of parallel lithium battery pack are: constant voltage, added battery capacity, reduced internal resistance, and the power supply time can be extended. The core content of parallel charging is the size of parallel current and its function. According to the parallel theory, the dry road current is equal to the sum of each branch current. Therefore, for the n parallel lithium battery combined with a single battery, the charging current should be the sum of the n lithium battery current, which is reasonable under Ohm's Law: I=U / R's formula, the design is reasonable.

However, the internal resistance of the battery after parallel will also change. According to the parallel internal resistance formula, the total internal resistance of the two parallel lithium batteries is equal to the ratio of the sum of the internal resistance product of the two batteries and their internal resistance, and the parallel resistance will decrease with the increase of the number of parallel batteries. Therefore, the efficiency of parallel charging of the lithium iron phosphate battery pack can be realized on the basis of the current that is less than the sum of n parallel lithium battery currents.

Lithium battery in series, voltage addition, equal current, which increases the voltage, battery in parallel, constant voltage, current is equal to the addition of the battery, this is often considered to increase the battery capacity, and can provide a greater current.