The series connection method of Pacific Automotive Network means that the negative electrode of the first lithium battery is connected to the positive electrode of the second lithium battery, the negative electrode of the second battery lithium is connected to the positive electrode. of the third battery, and so on, until the required voltage is reached, the voltage of this connection method is the sum of the voltages of the cells connected together, and the capacity is the capacity of a single cell, then protection. is connected to the output.
For example, a 12V battery requires three strings (taking ternary materials as an example), and a 24V battery requires seven strings.
The parallel connection method means that the positive electrode of the first lithium battery is connected to the positive electrode of the second cell, the negative electrode is connected to the negative electrode, and socontinued, until the required capacity is reached. is reached. The voltage in this overall method remains unchanged is the voltage of a single cell, and the capacity is the sum of all battery capacities.
Notes on series and parallel connection of lithium iron phosphate batteries:
1. Do not mix different brands of lithium iron phosphate batteries, different capacities, or new and old lithium batteries. . Choose those with consistent performance. Replace all batteries when they are low. When lithium battery packs are used in series, the same type of battery must be used. Pay attention to the polarity of the battery. If the polarity of a battery is reversed, the voltage of the entire battery string will be reduced instead of increased.
2. If different capacities or old and new lithium batteries are mixed, leakage, bare voltageshe, etc. can occur. This is because during the charging process, the difference in capacity causes some batteries to overcharge and undercharge. During discharge, some high-capacity batteries are not fully discharged, while low-capacity batteries are overdischarged. In such a vicious cycle, the battery is damaged and leaking or has low (zero) voltage.
3. Generally, lithium iron phosphate batteries need to be matched when used in series and parallel. The corresponding standards are: lithium battery cell voltage difference ≤ 10 mV, lithium battery core internal resistance difference ≤ 5 m, lithium. Battery cell capacity Difference ≤ 20 mA.
4. Remove the lithium battery protection circuit board and check whether the battery protection circuit board can be used in series or parallel circuits. Byexample, if it was a 4.2V protection circuit board and it was connected. series to 8.4 V, then the battery protection board. The card can no longer be used.
(Images/Text/Photos: Pacific Automotive Network Calling Beasts Q&A)
Hello! You can first connect 17 3.5V, 2000mAh batteries in series. At present, the voltage of this battery is about 60V and the capacity is still 2000mAh;
Then you can use 60 strings of it. Batteries. When connected in parallel, the battery capacity is 60*2Ah=120Ah
Actually, this is how electric vehicle battery units are combined.