What is the meaning and precautions of lithium iron phosphate battery series parallel

Meaning of Lithium Iron Phosphate Battery series parallel:

The series method refers to the first section of lithium negative electrode connected to the second section of lithium positive electrode, the second section of lithium negative electrode connected to the third section of positive electrode, and so on, until the desired voltage is reached, the voltage of this connection method is the sum of the voltage connected together, and the capacity is the capacity of a single section, and then protected in the output. For example, the 12V battery requires three strings (taking ternary materials as an example) and the 24V battery requires seven strings.

The parallel mode refers to the positive electrode of the first section of lithium is connected to the positive electrode of the second section, the negative electrode is connected to the negative electrode, and so on, to achieve the desired capacity, the voltage under this comprehensive mode is unchanged, still is the voltage of a single section, and the capacity is the sum of the battery capacity.

Lithium-ion battery pack combination to combine these two combinations to achieve the desired voltage and capacity, the battery is generally connected through the nickel plate, this to special equipment to nickel plate and cell welded together, this way is more solid and safe. Then the appropriate protection before output.

lithium iron phosphate battery series parallel precautions

Do not mix different brands of Lithium Iron Phosphate Batteries, different capacities, or old and new lithium-ion batteries, and select batteries with consistent performance. Replace all batteries when the battery is low. When using Li-ion battery packs in series, the same type of battery should be used. If the polarity of one battery is reversed, it will reduce the voltage of the whole battery pack, rather than adding voltage.

Mixing batteries of different capacities, or old and new Li-ion batteries, may result in leakage, zero voltage and other problems. This is because, during the charging process, the difference in capacity causes some batteries to be overcharged when charged, some batteries to be undercharged, and the high-capacity battery to be undercharged when discharged, while the low-capacity battery is overcharged. Such a vicious cycle will damage the battery and result in leakage or low (zero) voltage.

General iron phosphate Li-ion battery pack series parallel use to Li-ion battery cell pairing, pairing standards: Li-ion battery cell voltage difference ≤ 10mV, Li-ion battery core internal resistance difference ≤ 5m, Li-ion battery cell capacity difference ≤ 20mA.

Remove the lithium-ion battery pack protection circuit board, look at whether the battery protection board can be used in your series or parallel circuits, such as: in the past is 4.2V protection board, give you a series in 8.4V, the battery protection board can no longer be used.