Can lead-acid lithium batteries be connected in series and parallel with a common multiple voltage?

1. Lithium batteries and lead-acid batteries cannot be used in parallel, but they can be used interchangeably. When lithium batteries are used in series, use the same type of battery. Generally, lithium battery cells need to be paired in series and parallel, and the standard of pairing is: lithium battery cell voltage difference ≤ 10mV, lithium battery cell internal resistance difference ≤ 5mΩ, lithium battery cell capacity difference ≤ 20mA. Batteries with different capacities cannot be used in series and parallel, but they can be used interchangeably under the same voltage state.

The reasons are as follows: 1. The discharge platform is different. A single lithium battery is 3.2V, and a single lead-acid battery is 2*2=4V. grid, that is, 4-16V), if they are combined together, one kind of electricity will run out, and the other will have a lot of electricity. 2. The charging method is different. Lead-acid batteries are equalized charging, that is, constant current and constant voltage charging, while lithium batteries are charged with constant current first and then constant voltage. If the constant voltage is used at the beginning, the protection function of the lithium battery management board will be activated. Not charging, or the charging current is too large, will damage the battery life, and the battery will not be used for 50 times.

2. What happens when iron-lithium batteries and lead-acid batteries of the same voltage are used in parallel? (Lithium-iron batteries and lead-acid batteries are not acceptable regardless of series or parallel connection.)

Series connection:

1. Discharging: For batteries with different capacities, when discharging, one of them will be discharged first, while the other is still at a higher voltage;

2. No power: the life of the battery will be shortened by 80% or even damaged;

3. Charging: capacity Different batteries, when charging, there will always be one that is fully charged first, while the other is still at a low voltage. At this time, the charger will continue to charge, and the fully charged battery has the risk of overcharging;

4.Battery overcharge: it will break the chemical balance, and with the electrolysis of water, it will also damage the battery;

Parallel connection:

Charging between batteries. When the voltage of a certain battery drops, the battery with high voltage will charge it, and the current size is not controlled. If this current is superimposed with the charging current from the generator, even for an instant, it will be harmful to the battery. The damage of the battery is also very large. After a certain battery is damaged, the good battery will keep charging the damaged battery until its own power is exhausted. To sum up, lithium batteries and lead-acid batteries with different capacities cannot be used in series and parallel, unless you intervene in the process of charging and discharging, measure the battery voltage at any time, and dispose of it in time. There are strict conditions for the use of batteries in parallel, requiring the same factory, same model, same batch, connected to the circuit at the same time, and used in the same environment, otherwise, in general, it is not recommended to use.

3.What are the precautions for series and parallel connection of lithium batteries?

●Do not use different brands of lithium batteries, different capacities or old and new lithium batteries together, choose batteries with the same performance.

●When the battery power is low, replace all the batteries. When lithium batteries are used in series, use the same type of battery.

●General lithium battery series-parallel connection needs to be paired with lithium battery cells. The matching standard: lithium battery cell voltage difference ≤ 10mV, lithium battery cell internal resistance difference ≤ 5mΩ, lithium battery cell capacity difference ≤ 20mA.

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