Why can't lead-acid batteries and lithium-ion batteries be used in parallel?

1. The discharging platform is different. The single lithium ion battery is 3.7V, and the lead-acid single cell is 2*2u003d4V. (The lead-acid single cell is 2V, and a battery can be 2-6 cells, or even 8 cells. That is, 4-16V), if one is used up together, there will be a lot of electricity in the other (depending on the battery capacity). 2. The charging performance is not the same. Lead-acid batteries are charged with equalization, which is constant current and constant voltage charging; UPS lithium-ion batteries are charged with constant current first and then constant voltage. If constant voltage is used at the beginning, the lithium-ion battery management board protection will be activated. The function causes no charging, or the charging current is too large, which damages the battery life, and the battery cannot be used for 50 times. Lithium-ion batteries cannot be connected in parallel with lead-acid batteries for the following reasons: Discharge: When discharging UPS batteries with different capacities, one of them will be discharged first, and the other will still have a higher voltage; charging: batteries with different capacities will be charged. , There will always be one fully charged first, while the other still has a low voltage; dead battery: life shortened by 80%, or even damaged; battery overcharge: it will break the chemical balance, and with the electrolysis of water, it will also damage the battery; Intermediate charging: When a battery voltage drops, the battery with high voltage will charge it, and the current is not controlled. If this current is superimposed with the charging current from the generator, even instantaneous damage to the battery will be It is very large. After a battery is damaged, a good battery will continue to charge it until its own power is exhausted. 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: Explain the knowledge about the discharge rate of lithium-ion batteries