Which types of lithium iron phosphate battery packs should be paid attention to in series and parallel?

The series connection means that the negative electrode of the first lithium battery is connected to the positive electrode of the second lithium battery, and the negative electrode of the second lithium battery is connected to the positive electrode of the third battery, and so on, until the desired voltage is reached. The voltage of this connection method is so connected The total voltage of the battery cells together, and the capacity is the capacity of a single cell, and then the protection is connected to the output. For example, a 12V battery needs three strings (take ternary materials as an example), and a 24V battery needs 7 strings. Parallel mode means that the positive pole of the first lithium battery is connected to the positive pole of the second cell, and the negative pole is connected to the negative pole, and so on, to achieve the desired capacity. The voltage in this comprehensive mode is unchanged and still the voltage of a single cell. It is the sum of all battery capacities. Precautions for serial and parallel connection of lithium iron phosphate battery packs: ⒈Do not mix lithium iron phosphate battery packs of different brands, different capacities, or new and old lithium batteries. Choose batteries with the same performance. When the battery power is low, replace all the batteries. When using lithium battery packs in series, use the same type of battery. Pay attention to the polarity of the battery. If the polarity of one battery is installed reversely, the voltage of the entire string of batteries will be reduced instead of increasing. ⒉If different capacity or new and old lithium battery packs are used together, leakage, zero voltage, etc. may occur. This is because during the charging process, the capacity difference causes some batteries to be overcharged and some batteries are not fully charged. During discharging, some batteries with high capacity are not fully discharged, and batteries with low capacity are overdischarged. In such a vicious circle, the battery is damaged and leaks or low (zero) voltage. ⒊Generally, lithium iron phosphate battery packs are used in series and parallel to match lithium battery cores. The pairing standard: lithium battery core voltage difference ≤10mV, lithium battery core internal resistance difference ≤5m, lithium battery core capacity difference ≤20mA. ⒋Remove the lithium battery pack protection circuit board, and be optimistic about whether the battery protection board can be used in your serial or parallel circuit. For example: the 4.2V protection board used to be connected in series to 8.4V, then the battery protection board can no longer be used Up. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the hazards of long charging time for car lithium batteries?